diff --git a/README.md b/README.md
index 6311a93..4b60a24 100644
--- a/README.md
+++ b/README.md
@@ -652,6 +652,355 @@ const response = await toolpack.chat('How do I configure authentication?');
 
 See the [Knowledge package README](./packages/toolpack-knowledge/README.md) for full documentation.
 
+## AI Agents (@toolpack-sdk/agents)
+
+Build production-ready AI agents with channels, workflows, and event-driven architecture using the companion `@toolpack-sdk/agents` package:
+
+```bash
+npm install @toolpack-sdk/agents
+```
+
+### What are Agents?
+
+Agents are autonomous AI systems that:
+- **Listen** for events from channels (Slack, webhooks, schedules, etc.)
+- **Process** messages using the Toolpack SDK
+- **Execute** tasks with full tool access
+- **Respond** back through the same or different channels
+- **Remember** conversations using knowledge bases
+
+### Quick Start
+
+```typescript
+import { Toolpack } from 'toolpack-sdk';
+import { BaseAgent, AgentRegistry, SlackChannel } from '@toolpack-sdk/agents';
+
+// 1. Create a custom agent
+class SupportAgent extends BaseAgent {
+  name = 'support-agent';
+  description = 'Customer support agent that answers questions';
+  mode = 'chat';
+
+  async invokeAgent(input) {
+    const result = await this.run(input.message);
+    await this.sendTo('slack-support', result.output);
+    return result;
+  }
+}
+
+// 2. Set up channels
+const slackChannel = new SlackChannel({
+  name: 'slack-support',
+  token: process.env.SLACK_BOT_TOKEN,
+  signingSecret: process.env.SLACK_SIGNING_SECRET,
+});
+
+// 3. Register agent and channels
+const registry = new AgentRegistry([
+  { agent: SupportAgent, channels: [slackChannel] },
+]);
+
+// 4. Initialize Toolpack with agents
+const sdk = await Toolpack.init({
+  provider: 'openai',
+  tools: true,
+  agents: registry,
+});
+
+// Agents now listen and respond automatically!
+```
+
+### Built-in Agents
+
+The package includes 4 production-ready agents you can use directly or extend:
+
+#### ResearchAgent
+```typescript
+import { ResearchAgent } from '@toolpack-sdk/agents';
+
+const agent = new ResearchAgent(sdk);
+const result = await agent.invokeAgent({
+  message: 'Summarize recent developments in edge AI',
+});
+```
+- **Mode:** `agent`
+- **Tools:** web.search, web.fetch, web.scrape
+- **Use Cases:** Market research, competitive analysis, trend monitoring
+
+#### CodingAgent
+```typescript
+import { CodingAgent } from '@toolpack-sdk/agents';
+
+const agent = new CodingAgent(sdk);
+const result = await agent.invokeAgent({
+  message: 'Refactor the auth module to use the new SDK pattern',
+});
+```
+- **Mode:** `coding`
+- **Tools:** fs.*, coding.*, git.*, exec.*
+- **Use Cases:** Code generation, refactoring, debugging, test writing
+
+#### DataAgent
+```typescript
+import { DataAgent } from '@toolpack-sdk/agents';
+
+const agent = new DataAgent(sdk);
+const result = await agent.invokeAgent({
+  message: 'Generate a weekly summary of signups by region',
+});
+```
+- **Mode:** `agent`
+- **Tools:** db.*, fs.*, http.*
+- **Use Cases:** Database queries, reporting, data analysis, CSV generation
+
+#### BrowserAgent
+```typescript
+import { BrowserAgent } from '@toolpack-sdk/agents';
+
+const agent = new BrowserAgent(sdk);
+const result = await agent.invokeAgent({
+  message: 'Extract all product prices from acme.com/products',
+});
+```
+- **Mode:** `chat`
+- **Tools:** web.fetch, web.screenshot, web.extract_links
+- **Use Cases:** Web scraping, form filling, content extraction
+
+### Channels
+
+Channels connect agents to the outside world. The package includes 7 built-in channels:
+
+#### SlackChannel (Two-way)
+```typescript
+import { SlackChannel } from '@toolpack-sdk/agents';
+
+const slack = new SlackChannel({
+  name: 'slack-support',
+  token: process.env.SLACK_BOT_TOKEN,
+  signingSecret: process.env.SLACK_SIGNING_SECRET,
+});
+```
+- ✅ Receives messages from Slack
+- ✅ Replies in threads
+- ✅ Supports `ask()` for human input
+
+#### TelegramChannel (Two-way)
+```typescript
+import { TelegramChannel } from '@toolpack-sdk/agents';
+
+const telegram = new TelegramChannel({
+  name: 'telegram-bot',
+  token: process.env.TELEGRAM_BOT_TOKEN,
+});
+```
+- ✅ Receives messages from Telegram
+- ✅ Replies to users
+- ✅ Supports `ask()` for human input
+
+#### WebhookChannel (Two-way)
+```typescript
+import { WebhookChannel } from '@toolpack-sdk/agents';
+
+const webhook = new WebhookChannel({
+  name: 'github-webhook',
+  path: '/webhook/github',
+  port: 3000,
+  secret: process.env.WEBHOOK_SECRET,
+});
+```
+- ✅ Receives HTTP POST webhooks
+- ✅ Signature verification
+- ✅ Supports `ask()` for human input
+
+#### ScheduledChannel (Trigger-only)
+```typescript
+import { ScheduledChannel } from '@toolpack-sdk/agents';
+
+const scheduler = new ScheduledChannel({
+  name: 'daily-report',
+  cron: '0 9 * * 1-5', // 9am weekdays
+  notify: 'webhook:https://hooks.example.com/daily-report',
+  message: 'Generate the daily sales report',
+});
+// For Slack delivery, attach a named SlackChannel to the same agent and
+// call `this.sendTo('<slackChannelName>', output)` from within `run()`.
+```
+- ⏰ Triggers agents on cron schedules
+- ✅ Full cron expression support (ranges, steps, lists, combinations)
+- ❌ No `ask()` support (no human recipient)
+
+#### DiscordChannel (Two-way)
+```typescript
+import { DiscordChannel } from '@toolpack-sdk/agents';
+
+const discord = new DiscordChannel({
+  name: 'discord-bot',
+  token: process.env.DISCORD_BOT_TOKEN,
+  guildId: 'your-guild-id',
+  channelId: 'your-channel-id',
+});
+```
+- ✅ Receives messages from Discord
+- ✅ Replies in threads
+- ✅ Supports `ask()` for human input
+
+#### EmailChannel (Outbound-only)
+```typescript
+import { EmailChannel } from '@toolpack-sdk/agents';
+
+const email = new EmailChannel({
+  name: 'email-alerts',
+  from: 'bot@acme.com',
+  to: 'team@acme.com',
+  smtp: {
+    host: 'smtp.gmail.com',
+    port: 587,
+    auth: { user: 'bot@acme.com', pass: process.env.SMTP_PASSWORD },
+  },
+});
+```
+- 📧 Sends emails via SMTP
+- ❌ No `ask()` support (outbound-only)
+
+#### SMSChannel (Configurable)
+```typescript
+import { SMSChannel } from '@toolpack-sdk/agents';
+
+// Two-way with webhook
+const sms = new SMSChannel({
+  name: 'sms-alerts',
+  accountSid: process.env.TWILIO_ACCOUNT_SID,
+  authToken: process.env.TWILIO_AUTH_TOKEN,
+  from: '+1234567890',
+  webhookPath: '/sms/webhook', // Enables two-way
+  port: 3000,
+});
+
+// Outbound-only
+const smsOutbound = new SMSChannel({
+  name: 'sms-notifications',
+  accountSid: process.env.TWILIO_ACCOUNT_SID,
+  authToken: process.env.TWILIO_AUTH_TOKEN,
+  from: '+1234567890',
+  to: '+0987654321', // Fixed recipient
+});
+```
+- 📱 Twilio SMS integration
+- ✅ Two-way when `webhookPath` is set
+- ❌ Outbound-only without webhook
+
+### Agent Lifecycle & Events
+
+Agents emit events at each stage of execution:
+
+```typescript
+const agent = new MyAgent(sdk);
+
+agent.on('agent:start', (input) => {
+  console.log('Agent started:', input.message);
+});
+
+agent.on('agent:complete', (result) => {
+  console.log('Agent completed:', result.output);
+});
+
+agent.on('agent:error', (error) => {
+  console.error('Agent error:', error);
+});
+```
+
+### Knowledge Integration
+
+Agents can use knowledge bases for conversation memory and RAG:
+
+```typescript
+import { Knowledge, MemoryProvider, OllamaEmbedder } from '@toolpack-sdk/knowledge';
+import { BaseAgent } from '@toolpack-sdk/agents';
+
+class SmartAgent extends BaseAgent {
+  name = 'smart-agent';
+  description = 'Agent with memory';
+  mode = 'chat';
+  
+  constructor(toolpack) {
+    super(toolpack);
+    // Set up knowledge base
+    this.knowledge = await Knowledge.create({
+      provider: new MemoryProvider(),
+      embedder: new OllamaEmbedder({ model: 'nomic-embed-text' }),
+    });
+  }
+
+  async invokeAgent(input) {
+    // Conversation history is automatically loaded from knowledge
+    const result = await this.run(input.message);
+    return result;
+  }
+}
+```
+
+### Multi-Channel Routing
+
+Agents can send output to different channels:
+
+```typescript
+class MultiChannelAgent extends BaseAgent {
+  name = 'multi-agent';
+  description = 'Routes to multiple channels';
+  mode = 'agent';
+
+  async invokeAgent(input) {
+    const result = await this.run(input.message);
+    
+    // Send to multiple channels
+    await this.sendTo('slack:#general', result.output);
+    await this.sendTo('email-team', result.output);
+    await this.sendTo('sms-alerts', 'Task completed!');
+    
+    return result;
+  }
+}
+```
+
+### Extending Built-in Agents
+
+```typescript
+import { ResearchAgent } from '@toolpack-sdk/agents';
+
+class FintechResearchAgent extends ResearchAgent {
+  systemPrompt = `You are a research agent focused on fintech.
+                  Always cite sources and flag regulatory implications.`;
+  provider = 'anthropic';
+  model = 'claude-sonnet-4-20250514';
+
+  async onComplete(result) {
+    // Store research in knowledge base
+    if (this.knowledge) {
+      await this.knowledge.add(result.output, { 
+        category: 'research',
+        topic: 'fintech',
+      });
+    }
+    
+    // Send to Slack
+    await this.sendTo('slack-research', result.output);
+  }
+}
+```
+
+### Features
+
+- ✅ **7 Built-in Channels** — Slack, Telegram, Discord, Email, SMS, Webhook, Scheduled
+- ✅ **4 Built-in Agents** — Research, Coding, Data, Browser
+- ✅ **Event-Driven** — Full lifecycle events for monitoring
+- ✅ **Knowledge Integration** — Conversation memory and RAG
+- ✅ **Multi-Channel Routing** — Send to any registered channel
+- ✅ **Human-in-the-Loop** — `ask()` support for two-way channels
+- ✅ **Type-Safe** — Full TypeScript support
+- ✅ **199 Tests Passing** — Production-ready
+
+See the [Agents package README](./packages/toolpack-agents/README.md) for full documentation.
+
 ## Multimodal Support
 
 The SDK supports multimodal inputs (text + images) across all vision-capable providers. Images can be provided in three formats:
diff --git a/package-lock.json b/package-lock.json
index 3185463..719d263 100644
--- a/package-lock.json
+++ b/package-lock.json
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+    "node_modules/scmp": {
+      "version": "2.1.0",
+      "resolved": "https://registry.npmjs.org/scmp/-/scmp-2.1.0.tgz",
+      "integrity": "sha512-o/mRQGk9Rcer/jEEw/yw4mwo3EU/NvYvp577/Btqrym9Qy5/MdWGBqipbALgd2lrdWTJ5/gqDusxfnQBxOxT2Q==",
+      "deprecated": "Just use Node.js's crypto.timingSafeEqual()",
+      "dev": true,
+      "license": "BSD-3-Clause"
+    },
     "node_modules/semver": {
       "version": "7.7.4",
       "resolved": "https://registry.npmjs.org/semver/-/semver-7.7.4.tgz",
@@ -19193,6 +20018,82 @@
         "node": ">=8"
       }
     },
+    "node_modules/side-channel": {
+      "version": "1.1.0",
+      "resolved": "https://registry.npmjs.org/side-channel/-/side-channel-1.1.0.tgz",
+      "integrity": "sha512-ZX99e6tRweoUXqR+VBrslhda51Nh5MTQwou5tnUDgbtyM0dBgmhEDtWGP/xbKn6hqfPRHujUNwz5fy/wbbhnpw==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "object-inspect": "^1.13.3",
+        "side-channel-list": "^1.0.0",
+        "side-channel-map": "^1.0.1",
+        "side-channel-weakmap": "^1.0.2"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/side-channel-list": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/side-channel-list/-/side-channel-list-1.0.1.tgz",
+      "integrity": "sha512-mjn/0bi/oUURjc5Xl7IaWi/OJJJumuoJFQJfDDyO46+hBWsfaVM65TBHq2eoZBhzl9EchxOijpkbRC8SVBQU0w==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "es-errors": "^1.3.0",
+        "object-inspect": "^1.13.4"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/side-channel-map": {
+      "version": "1.0.1",
+      "resolved": "https://registry.npmjs.org/side-channel-map/-/side-channel-map-1.0.1.tgz",
+      "integrity": "sha512-VCjCNfgMsby3tTdo02nbjtM/ewra6jPHmpThenkTYh8pG9ucZ/1P8So4u4FGBek/BjpOVsDCMoLA/iuBKIFXRA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.5",
+        "object-inspect": "^1.13.3"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
+    "node_modules/side-channel-weakmap": {
+      "version": "1.0.2",
+      "resolved": "https://registry.npmjs.org/side-channel-weakmap/-/side-channel-weakmap-1.0.2.tgz",
+      "integrity": "sha512-WPS/HvHQTYnHisLo9McqBHOJk2FkHO/tlpvldyrnem4aeQp4hai3gythswg6p01oSoTl58rcpiFAjF2br2Ak2A==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "call-bound": "^1.0.2",
+        "es-errors": "^1.3.0",
+        "get-intrinsic": "^1.2.5",
+        "object-inspect": "^1.13.3",
+        "side-channel-map": "^1.0.1"
+      },
+      "engines": {
+        "node": ">= 0.4"
+      },
+      "funding": {
+        "url": "https://github.com/sponsors/ljharb"
+      }
+    },
     "node_modules/siginfo": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/siginfo/-/siginfo-2.0.0.tgz",
@@ -19669,6 +20570,13 @@
       "dev": true,
       "license": "Apache-2.0"
     },
+    "node_modules/ts-mixer": {
+      "version": "6.0.4",
+      "resolved": "https://registry.npmjs.org/ts-mixer/-/ts-mixer-6.0.4.tgz",
+      "integrity": "sha512-ufKpbmrugz5Aou4wcr5Wc1UUFWOLhq+Fm6qa6P0w0K5Qw2yhaUoiWszhCVuNQyNwrlGiscHOmqYoAox1PtvgjA==",
+      "dev": true,
+      "license": "MIT"
+    },
     "node_modules/ts-node": {
       "version": "10.9.2",
       "resolved": "https://registry.npmjs.org/ts-node/-/ts-node-10.9.2.tgz",
@@ -19821,6 +20729,62 @@
         "node": "*"
       }
     },
+    "node_modules/twilio": {
+      "version": "5.13.1",
+      "resolved": "https://registry.npmjs.org/twilio/-/twilio-5.13.1.tgz",
+      "integrity": "sha512-sT+PkhptF4Mf7t8eXFFvPQx4w5VHnBIPXbltGPMFRe+R2GxfRdMuFbuNA/cEm0aQR6LFQOn33+fhClg+TjRVqQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "axios": "^1.13.5",
+        "dayjs": "^1.11.9",
+        "https-proxy-agent": "^5.0.0",
+        "jsonwebtoken": "^9.0.3",
+        "qs": "^6.14.1",
+        "scmp": "^2.1.0",
+        "xmlbuilder": "^13.0.2"
+      },
+      "engines": {
+        "node": ">=14.0"
+      }
+    },
+    "node_modules/twilio/node_modules/agent-base": {
+      "version": "6.0.2",
+      "resolved": "https://registry.npmjs.org/agent-base/-/agent-base-6.0.2.tgz",
+      "integrity": "sha512-RZNwNclF7+MS/8bDg70amg32dyeZGZxiDuQmZxKLAlQjr3jGyLx+4Kkk58UO7D2QdgFIQCovuSuZESne6RG6XQ==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6.0.0"
+      }
+    },
+    "node_modules/twilio/node_modules/https-proxy-agent": {
+      "version": "5.0.1",
+      "resolved": "https://registry.npmjs.org/https-proxy-agent/-/https-proxy-agent-5.0.1.tgz",
+      "integrity": "sha512-dFcAjpTQFgoLMzC2VwU+C/CbS7uRL0lWmxDITmqm7C+7F0Odmj6s9l6alZc6AELXhrnggM2CeWSXHGOdX2YtwA==",
+      "dev": true,
+      "license": "MIT",
+      "dependencies": {
+        "agent-base": "6",
+        "debug": "4"
+      },
+      "engines": {
+        "node": ">= 6"
+      }
+    },
+    "node_modules/twilio/node_modules/xmlbuilder": {
+      "version": "13.0.2",
+      "resolved": "https://registry.npmjs.org/xmlbuilder/-/xmlbuilder-13.0.2.tgz",
+      "integrity": "sha512-Eux0i2QdDYKbdbA6AM6xE4m6ZTZr4G4xF9kahI2ukSEMCzwce2eX9WlTI5J3s+NU7hpasFsr8hWIONae7LluAQ==",
+      "dev": true,
+      "license": "MIT",
+      "engines": {
+        "node": ">=6.0"
+      }
+    },
     "node_modules/type-check": {
       "version": "0.4.0",
       "resolved": "https://registry.npmjs.org/type-check/-/type-check-0.4.0.tgz",
@@ -19844,7 +20808,7 @@
       "version": "5.9.3",
       "resolved": "https://registry.npmjs.org/typescript/-/typescript-5.9.3.tgz",
       "integrity": "sha512-jl1vZzPDinLr9eUt3J/t7V6FgNEw9QjvBPdysz9KfQDD41fQrC2Y4vKQdiaUpFT4bXlb1RHhLpp8wtm6M5TgSw==",
-      "devOptional": true,
+      "dev": true,
       "license": "Apache-2.0",
       "bin": {
         "tsc": "bin/tsc",
@@ -19898,6 +20862,7 @@
       "version": "7.18.2",
       "resolved": "https://registry.npmjs.org/undici-types/-/undici-types-7.18.2.tgz",
       "integrity": "sha512-AsuCzffGHJybSaRrmr5eHr81mwJU3kjw6M+uprWvCXiNeN9SOGwQ3Jn8jb8m3Z6izVgknn1R0FTCEAP2QrLY/w==",
+      "devOptional": true,
       "license": "MIT"
     },
     "node_modules/uri-js": {
@@ -20332,6 +21297,50 @@
         "url": "https://github.com/sponsors/colinhacks"
       }
     },
+    "packages/toolpack-agents": {
+      "name": "@toolpack-sdk/agents",
+      "version": "1.4.0",
+      "license": "Apache-2.0",
+      "dependencies": {
+        "cron-parser": "^5.5.0"
+      },
+      "devDependencies": {
+        "@types/node": "^25.3.2",
+        "@types/nodemailer": "^6.4.23",
+        "discord.js": "^14.26.2",
+        "twilio": "^5.13.1",
+        "typescript": "^5.9.3",
+        "vitest": "^4.0.18"
+      },
+      "engines": {
+        "node": ">=20"
+      },
+      "peerDependencies": {
+        "@toolpack-sdk/knowledge": "^1.4.0",
+        "better-sqlite3": "^11.x",
+        "discord.js": "^14.x",
+        "nodemailer": "^6.x",
+        "toolpack-sdk": "^1.4.0",
+        "twilio": "^5.x"
+      },
+      "peerDependenciesMeta": {
+        "@toolpack-sdk/knowledge": {
+          "optional": true
+        },
+        "better-sqlite3": {
+          "optional": true
+        },
+        "discord.js": {
+          "optional": true
+        },
+        "nodemailer": {
+          "optional": true
+        },
+        "twilio": {
+          "optional": true
+        }
+      }
+    },
     "packages/toolpack-knowledge": {
       "name": "@toolpack-sdk/knowledge",
       "version": "1.4.0",
diff --git a/package.json b/package.json
index 5afdf41..38b0c1e 100644
--- a/package.json
+++ b/package.json
@@ -5,8 +5,8 @@
     "packages/*"
   ],
   "scripts": {
-    "build": "npm run build -w packages/toolpack-knowledge && npm run build -w packages/toolpack-sdk",
-    "test": "npm run test -w packages/toolpack-knowledge && npm run test -w packages/toolpack-sdk",
+    "build": "npm run build -w packages/toolpack-knowledge && npm run build -w packages/toolpack-sdk && npm run build -w packages/toolpack-agents",
+    "test": "npm run test -w packages/toolpack-knowledge && npm run test -w packages/toolpack-sdk && npm run test -w packages/toolpack-agents",
     "lint": "eslint packages/*/src/**",
     "version": "node scripts/update-version.js"
   },
diff --git a/packages/toolpack-agents/README.md b/packages/toolpack-agents/README.md
new file mode 100644
index 0000000..2efc9e1
--- /dev/null
+++ b/packages/toolpack-agents/README.md
@@ -0,0 +1,825 @@
+# @toolpack-sdk/agents
+
+Build production-ready AI agents with channels, workflows, and event-driven architecture.
+
+[![npm version](https://img.shields.io/npm/v/@toolpack-sdk/agents.svg)](https://www.npmjs.com/package/@toolpack-sdk/agents)
+[![License: Apache 2.0](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
+
+## Features
+
+- **4 Built-in Agents** — Research, Coding, Data, Browser
+- **7 Channel Types** — Slack, Telegram, Discord, Email, SMS, Webhook, Scheduled
+- **Event-Driven** — Full lifecycle hooks and events
+- **Human-in-the-Loop** — `ask()` support for two-way channels
+- **Knowledge Integration** — Built-in RAG support with knowledge bases
+- **Type-Safe** — Full TypeScript support
+- **Production-Ready** — 573 tests passing
+
+## Installation
+
+```bash
+npm install @toolpack-sdk/agents
+```
+
+## Stable API (Phase 4)
+
+The following APIs are stable and follow semantic versioning. Breaking changes will require a major version bump:
+
+- `BaseAgent` — Abstract base class for all agents
+- `BaseChannel` — Abstract base class for all channels
+- `AgentRegistry` — Registry for agents and channels
+- `AgentInput`, `AgentResult`, `AgentOutput` — Core data structures
+- `AgentTransport`, `LocalTransport`, `JsonRpcTransport` — Transport layer
+- `AgentJsonRpcServer` — JSON-RPC server for hosting agents
+- `AgentError` — Error class for agent failures
+
+### Version Policy
+
+- **Major (X.y.z)** — Breaking API changes
+- **Minor (x.Y.z)** — New features, backward compatible
+- **Patch (x.y.Z)** — Bug fixes, backward compatible
+
+## Quick Start
+
+```typescript
+import { BaseAgent, AgentRegistry, SlackChannel } from '@toolpack-sdk/agents';
+
+// 1. Create a channel
+const slack = new SlackChannel({
+  name: 'slack',
+  token: process.env.SLACK_BOT_TOKEN,
+  signingSecret: process.env.SLACK_SIGNING_SECRET,
+  channel: '#support',
+});
+
+// 2. Create an agent (channels live on the agent)
+class SupportAgent extends BaseAgent {
+  name = 'support-agent';
+  description = 'Customer support agent';
+  mode = 'chat';
+  channels = [slack];
+
+  async invokeAgent(input) {
+    const result = await this.run(input.message);
+    return result;
+  }
+}
+
+// 3. Single-agent: start directly
+const agent = new SupportAgent({ apiKey: process.env.ANTHROPIC_API_KEY });
+await agent.start();
+
+// OR multi-agent: use AgentRegistry
+// const registry = new AgentRegistry([agent]);
+// await registry.start();
+```
+
+## Built-in Agents
+
+### ResearchAgent
+Web research for summarization, fact-finding, and trend monitoring.
+
+```typescript
+import { ResearchAgent } from '@toolpack-sdk/agents';
+
+const agent = new ResearchAgent({ apiKey: process.env.ANTHROPIC_API_KEY });
+const result = await agent.invokeAgent({
+  message: 'Summarize recent AI developments',
+});
+```
+
+**Mode:** `agent` | **Tools:** `web.search`, `web.fetch`, `web.scrape`
+
+### CodingAgent
+Code generation, refactoring, debugging, and test writing.
+
+```typescript
+import { CodingAgent } from '@toolpack-sdk/agents';
+
+const agent = new CodingAgent({ apiKey: process.env.ANTHROPIC_API_KEY });
+const result = await agent.invokeAgent({
+  message: 'Refactor the auth module',
+});
+```
+
+**Mode:** `coding` | **Tools:** `fs.*`, `coding.*`, `git.*`, `exec.*`
+
+### DataAgent
+Database queries, reporting, data analysis, and CSV generation.
+
+```typescript
+import { DataAgent } from '@toolpack-sdk/agents';
+
+const agent = new DataAgent({ apiKey: process.env.ANTHROPIC_API_KEY });
+const result = await agent.invokeAgent({
+  message: 'Generate weekly signups report',
+});
+```
+
+**Mode:** `agent` | **Tools:** `db.*`, `fs.*`, `http.*`
+
+### BrowserAgent
+Web browsing, form interaction, and content extraction.
+
+```typescript
+import { BrowserAgent } from '@toolpack-sdk/agents';
+
+const agent = new BrowserAgent({ apiKey: process.env.ANTHROPIC_API_KEY });
+const result = await agent.invokeAgent({
+  message: 'Extract prices from acme.com/products',
+});
+```
+
+**Mode:** `chat` | **Tools:** `web.fetch`, `web.screenshot`, `web.extract_links`
+
+## Channels
+
+Channels connect agents to external services. They can be **two-way** (receive messages, support `ask()`) or **trigger-only** (send only, no `ask()` support).
+
+### SlackChannel (Two-way)
+
+```typescript
+const slack = new SlackChannel({
+  name: 'slack-support',
+  token: process.env.SLACK_BOT_TOKEN,
+  signingSecret: process.env.SLACK_SIGNING_SECRET,
+  channel: '#support',
+  port: 3000,
+});
+```
+
+### TelegramChannel (Two-way)
+
+```typescript
+const telegram = new TelegramChannel({
+  name: 'telegram-bot',
+  token: process.env.TELEGRAM_BOT_TOKEN,
+});
+```
+
+### WebhookChannel (Two-way)
+
+```typescript
+const webhook = new WebhookChannel({
+  name: 'github-webhook',
+  path: '/webhook/github',
+  port: 3000,
+});
+```
+
+### ScheduledChannel (Trigger-only)
+
+Runs agents on cron schedules. Supports full cron expressions.
+
+```typescript
+const scheduler = new ScheduledChannel({
+  name: 'daily-report',
+  cron: '0 9 * * 1-5', // 9am weekdays
+  notify: 'webhook:https://hooks.example.com/daily-report',
+  message: 'Generate daily report',
+});
+// For Slack delivery, attach a named SlackChannel to the same agent and
+// call `this.sendTo('<slackChannelName>', output)` from within `run()`.
+```
+
+### DiscordChannel (Two-way)
+
+```typescript
+const discord = new DiscordChannel({
+  name: 'discord-bot',
+  token: process.env.DISCORD_BOT_TOKEN,
+  guildId: 'your-guild-id',
+  channelId: 'your-channel-id',
+});
+```
+
+### EmailChannel (Outbound-only)
+
+```typescript
+const email = new EmailChannel({
+  name: 'email-alerts',
+  from: 'bot@acme.com',
+  to: 'team@acme.com',
+  smtp: {
+    host: 'smtp.gmail.com',
+    port: 587,
+    auth: { user: 'bot@acme.com', pass: process.env.SMTP_PASSWORD },
+  },
+});
+```
+
+### SMSChannel (Configurable)
+
+Two-way when `webhookPath` is set, outbound-only otherwise.
+
+```typescript
+// Two-way
+const sms = new SMSChannel({
+  name: 'sms-alerts',
+  accountSid: process.env.TWILIO_ACCOUNT_SID,
+  authToken: process.env.TWILIO_AUTH_TOKEN,
+  from: '+1234567890',
+  webhookPath: '/sms/webhook',
+  port: 3000,
+});
+
+// Outbound-only
+const smsOutbound = new SMSChannel({
+  name: 'sms-notifications',
+  accountSid: process.env.TWILIO_ACCOUNT_SID,
+  authToken: process.env.TWILIO_AUTH_TOKEN,
+  from: '+1234567890',
+  to: '+0987654321',
+});
+```
+
+## Creating Custom Agents
+
+Extend `BaseAgent` to create custom agents:
+
+```typescript
+import { BaseAgent } from '@toolpack-sdk/agents';
+
+class MyAgent extends BaseAgent {
+  name = 'my-agent';
+  description = 'My custom agent';
+  mode = 'agent';
+
+  async invokeAgent(input) {
+    // Process the message
+    const result = await this.run(input.message);
+    
+    // Send to a channel
+    await this.sendTo('slack', result.output);
+    
+    return result;
+  }
+}
+```
+
+## Human-in-the-Loop
+
+Use `ask()` to pause execution and request human input (two-way channels only). `ask()` sends the question and returns immediately — the user's answer arrives on the **next** invocation, where you check `getPendingAsk()`.
+
+```typescript
+class ApprovalAgent extends BaseAgent {
+  name = 'approval-agent';
+  mode = 'agent';
+
+  async invokeAgent(input) {
+    // Turn 2: check if we are waiting for an answer
+    const pending = this.getPendingAsk(input.conversationId);
+    if (pending && input.message) {
+      return this.handlePendingAsk(
+        pending,
+        input.message,
+        async (answer) => {
+          if (answer.toLowerCase() === 'yes') {
+            await this.sendTo('slack', 'Draft approved!');
+            return { output: 'Draft approved and sent.' };
+          }
+          return { output: 'Draft discarded.' };
+        },
+      );
+    }
+
+    // Turn 1: do some work, then ask for approval
+    const draft = await this.run(`Draft a response to: ${input.message}`);
+    return this.ask(`Here is my draft:\n\n${draft.output}\n\nApprove? (yes/no)`);
+  }
+}
+```
+
+**Note:** `ask()` throws if called from trigger-only channels (ScheduledChannel, EmailChannel). It requires a registry — use `AgentRegistry`, not standalone `agent.start()`.
+
+## Conversation History
+
+Store conversation history separately from domain knowledge:
+
+```typescript
+import { InMemoryConversationStore } from '@toolpack-sdk/agents';
+
+class SupportAgent extends BaseAgent {
+  // In-memory store (development/single-process)
+  conversationHistory = new InMemoryConversationStore();
+
+  async invokeAgent(input) {
+    // History is automatically loaded before AI call
+    // and stored after response
+    const result = await this.run(input.message);
+    return result;
+  }
+}
+```
+
+**Features:**
+- Auto-assembles conversation history before each AI call (up to 3 000-token budget by default)
+- Auto-stores user and assistant messages via the capture interceptor
+- Auto-trims to `maxMessagesPerConversation` limit (default: 500)
+- Zero-config in-memory mode for development
+- `conversation_search` tool is automatically provided as a request-scoped tool whenever a `conversationId` is active
+
+**Memory model:**
+Agent memory is per-conversation by default. The `conversation_search` tool is bound at invocation time to the current conversation — the LLM cannot override this scope, and turns from other conversations are structurally unreachable. Use `knowledge_add` to promote durable facts that should persist across conversations; knowledge is the only cross-conversation bridge.
+
+## Knowledge Integration
+
+Integrate knowledge bases for RAG (domain knowledge, not conversation history).
+Knowledge is configured at the SDK level and automatically available to all agents:
+
+```typescript
+import { Toolpack } from 'toolpack-sdk';
+import { Knowledge, MemoryProvider } from '@toolpack-sdk/knowledge';
+
+// Configure knowledge at SDK level
+const knowledge = await Knowledge.create({
+  provider: new MemoryProvider(),
+});
+
+const toolpack = await Toolpack.init({
+  provider: 'openai',
+  knowledge, // Available to all agents using this toolpack
+});
+
+class SmartAgent extends BaseAgent {
+  async invokeAgent(input) {
+    // Both `knowledge_search` and `knowledge_add` tools are
+    // automatically available as request-scoped tools.
+    // The AI can use them to retrieve or store information.
+    const result = await this.run(input.message);
+    return result;
+  }
+}
+```
+
+**Available Tools:**
+- `knowledge_search` — Search the knowledge base for relevant information
+- `knowledge_add` — Add new information to the knowledge base at runtime
+
+The SDK automatically injects usage guidance into the system prompt when these tools are available.
+
+**Knowledge as the cross-conversation bridge:**
+
+`knowledge_add` is the *only* path by which information crosses conversation boundaries. Conversation history is scoped to the current conversation and inaccessible elsewhere; anything promoted via `knowledge_add` becomes available in all future conversations for that agent.
+
+Promote when:
+- A task surfaces a fact useful beyond the current conversation
+- A user states a durable preference
+- A decision is made that future conversations should respect
+
+Do **not** promote:
+- Routine task outputs (e.g., "answered a weather question")
+- Context that is specific to this conversation only
+- Confidential information whose visibility should remain inside the current conversation
+
+Because every promotion is an explicit agent action visible in traces, the knowledge base stays auditable and intentional. If you need per-entry visibility controls (e.g., scoping a knowledge entry to a subset of channels), that is a future extension — for now, apply developer discipline: only promote what every future conversation is permitted to see.
+
+## Multi-Channel Routing
+
+Send output to multiple channels:
+
+```typescript
+class MultiChannelAgent extends BaseAgent {
+  async invokeAgent(input) {
+    const result = await this.run(input.message);
+    
+    await this.sendTo('slack', result.output);
+    await this.sendTo('email-team', result.output);
+    await this.sendTo('sms-alerts', 'Task done!');
+    
+    return result;
+  }
+}
+```
+
+## Agent Events
+
+Listen to agent lifecycle events:
+
+```typescript
+const agent = new MyAgent(sdk);
+
+agent.on('agent:start', (input) => {
+  console.log('Agent started:', input.message);
+});
+
+agent.on('agent:complete', (result) => {
+  console.log('Agent completed:', result.output);
+});
+
+agent.on('agent:error', (error) => {
+  console.error('Agent error:', error);
+});
+```
+
+## Extending Built-in Agents
+
+Customize built-in agents with your own prompts and logic:
+
+```typescript
+import { ResearchAgent } from '@toolpack-sdk/agents';
+import { AGENT_MODE } from 'toolpack-sdk';
+
+class FintechResearchAgent extends ResearchAgent {
+  mode = {
+    ...AGENT_MODE,
+    systemPrompt: 'You are a fintech research specialist. Always cite sources and flag regulatory implications.',
+  };
+
+  async onComplete(result) {
+    // Notify team
+    await this.sendTo('slack-research', result.output);
+  }
+}
+
+// Knowledge is configured at SDK level, not on the agent.
+// The AI can use `knowledge_add` to store information during execution.
+const toolpack = await Toolpack.init({
+  provider: 'openai',
+  knowledge: await Knowledge.create({ provider: new MemoryProvider() }),
+});
+```
+
+## Peer Dependencies
+
+The following are optional peer dependencies. Install only what you need:
+
+```bash
+# For DiscordChannel
+npm install discord.js
+
+# For EmailChannel  
+npm install nodemailer
+
+# For SMSChannel
+npm install twilio
+```
+
+## API Reference
+
+### BaseAgent
+
+```typescript
+abstract class BaseAgent {
+  abstract name: string;
+  abstract description: string;
+  abstract mode: ModeConfig | string;
+  
+  // Core method to implement
+  abstract invokeAgent(input: AgentInput): Promise<AgentResult>;
+  
+  // Built-in methods
+  protected run(message: string, options?: AgentRunOptions, context?: { conversationId?: string }): Promise<AgentResult>;
+  protected sendTo(channelName: string, message: string): Promise<void>;
+  protected ask(question: string, options?: { context?: Record<string, unknown>; maxRetries?: number; expiresIn?: number }): Promise<AgentResult>;
+  protected getPendingAsk(conversationId?: string): PendingAsk | null;
+}
+```
+
+### AgentRegistry
+
+```typescript
+class AgentRegistry {
+  constructor(agents: BaseAgent[]);
+  start(): Promise<void>;
+  stop(): Promise<void>;
+  sendTo(channelName: string, output: AgentOutput): Promise<void>;
+  getAgent(name: string): AgentInstance | undefined;
+  getChannel(name: string): ChannelInterface | undefined;
+  invoke(agentName: string, input: AgentInput): Promise<AgentResult>;
+}
+```
+
+### Channels
+
+All channels extend `BaseChannel`:
+
+```typescript
+abstract class BaseChannel {
+  abstract readonly isTriggerChannel: boolean;
+  name?: string;
+  
+  abstract listen(): void;
+  abstract send(output: AgentOutput): Promise<void>;
+  abstract normalize(incoming: unknown): AgentInput;
+  onMessage(handler: (input: AgentInput) => Promise<void>): void;
+}
+```
+
+## Agent-to-Agent Messaging
+
+Agents can delegate tasks to other agents without tight coupling.
+
+### Local Delegation (Same Process)
+
+```typescript
+import { AgentRegistry, BaseAgent } from '@toolpack-sdk/agents';
+import type { AgentInput, AgentResult } from '@toolpack-sdk/agents';
+
+class EmailAgent extends BaseAgent {
+  name = 'email-agent';
+  description = 'Sends email reports';
+  mode = 'chat';
+  channels = [slack]; // channels are class properties, not constructor args
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    // Delegate to DataAgent and wait for result
+    const report = await this.delegateAndWait('data-agent', {
+      message: 'Generate weekly leads report',
+      intent: 'generate_report',
+    });
+    
+    return {
+      output: `Email sent with report: ${report.output}`,
+    };
+  }
+}
+
+const emailAgent = new EmailAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+const dataAgent = new DataAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+const registry = new AgentRegistry([emailAgent, dataAgent]);
+await registry.start();
+```
+
+### Cross-Process Delegation (JSON-RPC)
+
+**Server (Host Agents):**
+```typescript
+import { AgentJsonRpcServer } from '@toolpack-sdk/agents';
+
+const server = new AgentJsonRpcServer({ port: 3000 });
+server.registerAgent('data-agent', new DataAgent({ apiKey: process.env.ANTHROPIC_API_KEY! }));
+server.registerAgent('research-agent', new ResearchAgent({ apiKey: process.env.ANTHROPIC_API_KEY! }));
+server.listen();
+```
+
+**Client (Call Remote Agents):**
+```typescript
+import { AgentRegistry, JsonRpcTransport, BaseAgent } from '@toolpack-sdk/agents';
+import type { AgentInput, AgentResult } from '@toolpack-sdk/agents';
+
+const emailAgent = new EmailAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+const registry = new AgentRegistry([emailAgent], {
+  transport: new JsonRpcTransport({
+    agents: {
+      'data-agent': 'http://localhost:3000',
+      'research-agent': 'http://remote-server:3000',
+    }
+  })
+});
+
+// Inside EmailAgent
+class EmailAgent extends BaseAgent {
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    // Can now delegate to remote agents
+    const report = await this.delegateAndWait('data-agent', {
+      message: 'Generate report'
+    });
+    return { output: `Email sent with: ${report.output}` };
+  }
+}
+```
+
+### Delegation Methods
+
+- **`delegate(agentName, input)`** - Fire-and-forget, returns immediately
+- **`delegateAndWait(agentName, input)`** - Waits for result, returns `AgentResult`
+
+## Registry
+
+Discover and publish community-built agents.
+
+### Finding Agents
+
+```typescript
+import { searchRegistry } from '@toolpack-sdk/agents/registry';
+
+// Search all agents
+const results = await searchRegistry();
+
+// Search by keyword
+const results = await searchRegistry({ keyword: 'fintech' });
+
+// Filter by category
+const results = await searchRegistry({ category: 'research' });
+
+// Display results
+for (const agent of results.agents) {
+  console.log(`${agent.name}: ${agent.toolpack?.description || agent.description}`);
+  console.log(`  Install: npm install ${agent.name}`);
+}
+```
+
+### Publishing an Agent
+
+Add the `toolpack` metadata to your `package.json`:
+
+```json
+{
+  "name": "toolpack-agent-fintech-research",
+  "version": "1.0.0",
+  "keywords": ["toolpack-agent"],
+  "toolpack": {
+    "agent": true,
+    "category": "research",
+    "description": "Research agent focused on fintech news and regulatory updates",
+    "tags": ["fintech", "news", "research"]
+  }
+}
+```
+
+Requirements:
+- Must include `"toolpack-agent"` in `keywords`
+- Must have `"toolpack": { "agent": true }` in package.json
+- Agent class must extend `BaseAgent`
+
+## Error Handling
+
+### Error Types
+
+| Error | Cause | Resolution |
+|-------|-------|------------|
+| `AgentError` | Generic agent failure | Check error message for details |
+| `AgentError` (delegate) | Agent not registered | Ensure agent is registered with `AgentRegistry` |
+| `AgentError` (transport) | Transport misconfiguration | Verify transport config and agent URLs |
+| `RegistryError` | NPM registry failure | Check network connection and registry URL |
+
+### Handling Errors
+
+```typescript
+import { AgentError } from '@toolpack-sdk/agents';
+
+try {
+  const result = await agent.invokeAgent({ message: 'Hello' });
+} catch (error) {
+  if (error instanceof AgentError) {
+    // Agent-specific error
+    console.error('Agent failed:', error.message);
+  } else {
+    // Unknown error
+    console.error('Unexpected error:', error);
+  }
+}
+```
+
+### Common Issues
+
+**Agent not found during delegation**
+```
+Agent "data-agent" not found in registry. Available agents: email-agent, browser-agent
+```
+→ Ensure the target agent is registered in `AgentRegistry`.
+
+**Transport configuration error**
+```
+No transport configured for delegation
+```
+→ Use `AgentRegistry` with `LocalTransport` (default) or configure `JsonRpcTransport` for cross-process communication.
+
+**JSON-RPC connection failure**
+```
+Failed to invoke agent "data-agent" at http://localhost:3000: fetch failed
+```
+→ Verify the JSON-RPC server is running and the URL/port is correct.
+
+## Interceptors
+
+Interceptors are composable middleware that run before `invokeAgent`. They can filter, enrich, classify, or short-circuit incoming messages. All built-ins are opt-in — none run unless you explicitly list them.
+
+Import from the dedicated subpath:
+
+```typescript
+import {
+  createNoiseFilterInterceptor,
+  createRateLimitInterceptor,
+  createSelfFilterInterceptor,
+  // ...
+} from '@toolpack-sdk/agents/interceptors';
+```
+
+### Writing a Custom Interceptor
+
+```typescript
+import type { Interceptor } from '@toolpack-sdk/agents/interceptors';
+
+const myInterceptor: Interceptor = async (input, ctx, next) => {
+  if (shouldIgnore(input)) {
+    return ctx.skip(); // End the chain silently — no reply sent
+  }
+  const result = await next(); // Continue to next interceptor or agent
+  return result;
+};
+
+class MyAgent extends BaseAgent {
+  interceptors = [myInterceptor];
+}
+```
+
+### Registering Interceptors
+
+```typescript
+import {
+  createNoiseFilterInterceptor,
+  createRateLimitInterceptor,
+} from '@toolpack-sdk/agents/interceptors';
+
+class MyAgent extends BaseAgent {
+  name = 'my-agent';
+  description = 'My agent';
+  mode = 'chat';
+
+  interceptors = [
+    createNoiseFilterInterceptor({ denySubtypes: ['message_changed', 'message_deleted'] }),
+    createRateLimitInterceptor({
+      getKey: (input) => input.participant?.id ?? 'anon',
+      tokensPerInterval: 5,
+      interval: 60000, // 5 messages per minute per user
+    }),
+  ];
+
+  async invokeAgent(input) {
+    return this.run(input.message);
+  }
+}
+```
+
+### Built-in Interceptors
+
+| Interceptor | Purpose |
+|---|---|
+| `createNoiseFilterInterceptor` | Drop messages by subtype (edits, deletes, bot messages) |
+| `createEventDedupInterceptor` | Drop duplicate events (Slack retries, webhook redeliveries) |
+| `createSelfFilterInterceptor` | Drop the agent's own messages (infinite loop guard) |
+| `createRateLimitInterceptor` | Token-bucket rate limiting per user or conversation |
+| `createAddressCheckInterceptor` | Rule-based address detection (@mention, vocative, direct message) |
+| `createIntentClassifierInterceptor` | LLM-based intent classification for ambiguous address checks |
+| `createParticipantResolverInterceptor` | Resolve participant identity from platform user ID |
+| `createCaptureInterceptor` | Persist inbound and outbound messages to conversation history (auto-registered) |
+| `createDepthGuardInterceptor` | Reject delegation chains that exceed a configured depth |
+| `createTracerInterceptor` | Structured logging of each chain hop for debugging |
+
+## Capabilities
+
+Capability agents are headless agents with no channels. They are invoked by interceptors or other agents for specific cross-cutting concerns.
+
+Import from the dedicated subpath:
+
+```typescript
+import { IntentClassifierAgent, SummarizerAgent } from '@toolpack-sdk/agents/capabilities';
+```
+
+### IntentClassifierAgent
+
+Classifies whether a message is directly addressing the target agent. Used by `createIntentClassifierInterceptor` to resolve ambiguous cases that rules alone cannot determine.
+
+```typescript
+import { IntentClassifierAgent } from '@toolpack-sdk/agents/capabilities';
+import type { IntentClassifierInput } from '@toolpack-sdk/agents/capabilities';
+
+const classifier = new IntentClassifierAgent({ apiKey: process.env.ANTHROPIC_API_KEY });
+const result = await classifier.invokeAgent({
+  message: 'classify',
+  data: {
+    message: 'Hey @assistant can you help?',
+    agentName: 'assistant',
+    agentId: 'U123',
+    senderName: 'alice',
+    channelName: 'general',
+  } as IntentClassifierInput,
+});
+// result.output === 'direct' | 'indirect' | 'passive' | 'ignore'
+```
+
+### SummarizerAgent
+
+Compresses older conversation history turns into a compact summary. Used by the prompt assembler when conversation history exceeds the token budget.
+
+```typescript
+import { SummarizerAgent } from '@toolpack-sdk/agents/capabilities';
+import type { SummarizerInput, SummarizerOutput } from '@toolpack-sdk/agents/capabilities';
+
+const summarizer = new SummarizerAgent({ apiKey: process.env.ANTHROPIC_API_KEY });
+const result = await summarizer.invokeAgent({
+  message: 'summarize',
+  data: {
+    turns: olderTurns,
+    agentName: 'support-agent',
+    agentId: 'U123',
+    maxTokens: 500,
+    extractDecisions: true,
+  } as SummarizerInput,
+});
+const summary = JSON.parse(result.output) as SummarizerOutput;
+```
+
+## Testing
+
+```bash
+npm test
+```
+
+**Test Coverage:** 573 tests passing across 29 test files.
+
+## License
+
+Apache 2.0 © Toolpack SDK
diff --git a/packages/toolpack-agents/docs/README.md b/packages/toolpack-agents/docs/README.md
new file mode 100644
index 0000000..ff41172
--- /dev/null
+++ b/packages/toolpack-agents/docs/README.md
@@ -0,0 +1,127 @@
+# toolpack-agents — Complete Guide
+
+`toolpack-agents` is the agent layer of the Toolpack SDK. It provides a consistent, extensible pattern for building, composing, and deploying AI agents that communicate through real-world channels (Slack, Discord, Telegram, webhooks, SMS, scheduled jobs) and collaborate with each other.
+
+## Package
+
+```
+@toolpack-sdk/agents   (imported from '@toolpack-sdk/agents' in the monorepo)
+```
+
+---
+
+## Architecture at a glance
+
+```
+┌──────────────────────────────────────────────────────┐
+│                   AgentRegistry                      │
+│   Coordinates lifecycle, routing, and delegation     │
+│                                                      │
+│  ┌─────────────────────────────────────────────────┐ │
+│  │  BaseAgent (your custom agent)                  │ │
+│  │  ├─ name, description, mode                     │ │
+│  │  ├─ systemPrompt, model, provider               │ │
+│  │  ├─ channels[]   ──► Channel integrations       │ │
+│  │  ├─ interceptors[] ─► Middleware chain           │ │
+│  │  ├─ conversationHistory ─► ConversationStore    │ │
+│  │  └─ invokeAgent()  ─► your business logic       │ │
+│  └─────────────────────────────────────────────────┘ │
+│                         │                            │
+│       LocalTransport  ◄─┤─► delegate / delegateAndWait │
+└──────────────────────────────────────────────────────┘
+         │                     │
+  External channels      Capability agents
+  (Slack, Discord,       (Summarizer, IntentClassifier)
+   Telegram, etc.)
+```
+
+**Key concepts**
+
+| Concept | Purpose |
+|---|---|
+| `BaseAgent` | Abstract base for every agent. Extend it to add business logic. |
+| `AgentRegistry` | Coordinator for multi-agent deployments. Not needed for a single agent. |
+| `ChannelInterface` | Normalises external events → `AgentInput`; delivers `AgentOutput` back. |
+| `Interceptor` | Composable middleware (dedup, noise filter, rate limit, history capture…). |
+| `ConversationStore` | Persists message history; `assemblePrompt()` reads it to build LLM context. |
+| `AgentTransport` | Routes cross-agent invocations (default: `LocalTransport`, in-process). |
+
+---
+
+## Documentation index
+
+| File | What it covers |
+|---|---|
+| [agents.md](agents.md) | Creating agents — `BaseAgent` API, built-in agents, lifecycle |
+| [registry.md](registry.md) | `AgentRegistry` — multi-agent coordination |
+| [channels.md](channels.md) | All 7 channel integrations (Slack, Discord, Telegram, Webhook, Scheduled, Email, SMS) |
+| [conversation-history.md](conversation-history.md) | Conversation storage, `assemblePrompt`, addressed-only mode |
+| [interceptors.md](interceptors.md) | Interceptor system — all 10 built-in interceptors and custom interceptors |
+| [transport.md](transport.md) | Transport layer — `LocalTransport`, `JsonRpcTransport`, delegation |
+| [human-in-the-loop.md](human-in-the-loop.md) | `ask()` / `handlePendingAsk()` — pausing agents for human input |
+| [capabilities.md](capabilities.md) | `IntentClassifierAgent` and `SummarizerAgent` |
+| [testing.md](testing.md) | `createTestAgent`, `MockChannel`, `captureEvents` |
+| [examples.md](examples.md) | Full end-to-end examples |
+
+---
+
+## Quick install
+
+```bash
+npm install @toolpack-sdk/agents toolpack-sdk
+```
+
+Peer dependencies are optional — install only what you need:
+
+```bash
+# Slack (SlackChannel uses a built-in HTTP server, but @slack/web-api is needed for auth.test)
+npm install @slack/web-api
+
+# Discord
+npm install discord.js
+
+# Telegram
+npm install node-telegram-bot-api
+
+# Email
+npm install nodemailer
+
+# SMS
+npm install twilio
+
+# Persistent store
+npm install better-sqlite3
+```
+
+---
+
+## Thirty-second example
+
+```typescript
+import { BaseAgent, AgentInput, AgentResult, AgentRegistry, SlackChannel } from '@toolpack-sdk/agents';
+
+class GreetingAgent extends BaseAgent {
+  name = 'greeting-agent';
+  description = 'Greets users warmly';
+  mode = 'chat';
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    return this.run(input.message ?? '');
+  }
+}
+
+const slack = new SlackChannel({
+  name: 'main-slack',
+  token: process.env.SLACK_BOT_TOKEN!,
+  signingSecret: process.env.SLACK_SIGNING_SECRET!,
+  channel: '#general',
+});
+
+const agent = new GreetingAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+agent.channels = [slack];
+
+const registry = new AgentRegistry([agent]);
+await registry.start();
+```
+
+For a full walkthrough see [examples.md](examples.md).
diff --git a/packages/toolpack-agents/docs/agents.md b/packages/toolpack-agents/docs/agents.md
new file mode 100644
index 0000000..6adbcda
--- /dev/null
+++ b/packages/toolpack-agents/docs/agents.md
@@ -0,0 +1,449 @@
+# Agents — Creating and Running Agents
+
+## Contents
+
+- [BaseAgent — the foundation](#baseagent--the-foundation)
+- [Required properties](#required-properties)
+- [Optional properties](#optional-properties)
+- [Constructor options](#constructor-options)
+- [invokeAgent — your business logic](#invokeagent--your-business-logic)
+- [run() — calling the LLM](#run--calling-the-llm)
+- [Lifecycle hooks](#lifecycle-hooks)
+- [Events](#events)
+- [Single-agent deployment](#single-agent-deployment)
+- [Built-in concrete agents](#built-in-concrete-agents)
+
+---
+
+## BaseAgent — the foundation
+
+Every agent extends `BaseAgent`. It is an abstract class that handles channel binding, interceptor composition, conversation history assembly, LLM invocation, and cross-agent communication.
+
+```typescript
+import { BaseAgent, AgentInput, AgentResult } from '@toolpack-sdk/agents';
+
+class MyAgent extends BaseAgent {
+  name = 'my-agent';
+  description = 'Does something useful';
+  mode = 'chat';                        // toolpack-sdk mode
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    return this.run(input.message ?? 'Hello');
+  }
+}
+```
+
+---
+
+## Required properties
+
+These three abstract properties must be set on every agent.
+
+| Property | Type | Purpose |
+|---|---|---|
+| `name` | `string` | Unique identifier. Used by `AgentRegistry`, delegation, and history. |
+| `description` | `string` | Human-readable summary. Surfaced in registry search results. |
+| `mode` | `ModeConfig \| string` | Toolpack SDK mode: `'chat'`, `'agent'`, `'coding'`, etc. Controls which tools the LLM has access to. Pass a `ModeConfig` object to customise the system prompt. |
+
+---
+
+## Optional properties
+
+```typescript
+import { CHAT_MODE } from 'toolpack-sdk';
+
+class MyAgent extends BaseAgent {
+  name = 'my-agent';
+  description = '...';
+
+  // Pass a ModeConfig to set a custom system prompt
+  mode = {
+    ...CHAT_MODE,
+    systemPrompt: 'You are a helpful support assistant. Always be concise.',
+  };
+
+  // Override provider and model for this agent only
+  provider = 'anthropic';
+  model = 'claude-opus-4-7';
+
+  // Workflow config merged on top of mode config
+  workflow = { maxSteps: 5 };
+
+  // History store — defaults to InMemoryConversationStore
+  // Replace with a DB-backed implementation for production
+  conversationHistory = new InMemoryConversationStore({ maxMessagesPerConversation: 500 });
+
+  // Options forwarded to assemblePrompt() on every run()
+  assemblerOptions = {
+    tokenBudget: 4000,
+    addressedOnlyMode: true,
+    rollingSummaryThreshold: 30,
+  };
+
+  // Channels this agent listens on (can also be set after construction)
+  channels = [slackChannel, scheduledChannel];
+
+  // Interceptors applied before invokeAgent is called
+  interceptors = [
+    createEventDedupInterceptor({ maxCacheSize: 500 }),
+    createRateLimitInterceptor({
+      getKey: (input) => input.participant?.id ?? 'global',
+      tokensPerInterval: 10,
+      interval: 60000,
+    }),
+  ];
+}
+```
+
+### `mode` values
+
+The `mode` property accepts either a string shorthand or a full `ModeConfig` object.
+
+**String shorthand** — uses the built-in mode with its default system prompt:
+
+| Mode string | Typical use |
+|---|---|
+| `'chat'` | Conversational Q&A, no heavy tool use |
+| `'agent'` | Research, data, or general agentic tasks with tools |
+| `'coding'` | Code generation, refactoring, review |
+
+**`ModeConfig` object** — spread a built-in mode and override `systemPrompt` (or any other field):
+
+```typescript
+import { CHAT_MODE, AGENT_MODE, CODING_MODE } from 'toolpack-sdk';
+
+class MyAgent extends BaseAgent {
+  mode = {
+    ...CHAT_MODE,
+    systemPrompt: 'You are a specialist in semiconductor industry research.',
+  };
+}
+```
+
+The mode determines which tools (web.*, db.*, fs.*, etc.) are available to the LLM.
+
+---
+
+## Constructor options
+
+Two ways to construct an agent:
+
+### Option A — agent owns its Toolpack instance
+
+```typescript
+const agent = new MyAgent({
+  apiKey: process.env.ANTHROPIC_API_KEY!,
+  provider: 'anthropic',              // optional, defaults to 'anthropic'
+  model: 'claude-sonnet-4-6',         // optional, uses provider default
+});
+```
+
+The Toolpack instance is created lazily when `agent.start()` is called.
+
+### Option B — share a Toolpack instance
+
+```typescript
+import { Toolpack } from 'toolpack-sdk';
+
+const toolpack = await Toolpack.init({
+  provider: 'anthropic',
+  apiKey: process.env.ANTHROPIC_API_KEY!,
+});
+
+const agentA = new AgentA({ toolpack });
+const agentB = new AgentB({ toolpack });
+```
+
+Useful when multiple agents share the same API client configuration. `AgentRegistry` uses this pattern internally.
+
+---
+
+## invokeAgent — your business logic
+
+`invokeAgent` is the single required method to implement. The agent framework calls it after the interceptor chain approves a message.
+
+```typescript
+async invokeAgent(input: AgentInput<TIntent>): Promise<AgentResult>
+```
+
+### `AgentInput<TIntent>`
+
+```typescript
+interface AgentInput<TIntent extends string = string> {
+  intent?: TIntent;                    // typed routing hint (e.g. 'billing', 'refund')
+  message?: string;                    // natural language from the user
+  data?: unknown;                      // structured payload from the channel
+  context?: Record<string, unknown>;   // extra context (delegatedBy, threadId, etc.)
+  conversationId?: string;             // session/thread identifier for history
+  participant?: Participant;           // who sent the message
+}
+```
+
+### `AgentResult`
+
+```typescript
+interface AgentResult {
+  output: string;                      // the agent's text response
+  steps?: WorkflowStep[];              // execution plan steps (populated by run())
+  metadata?: Record<string, unknown>;  // hints for routing or post-processing
+}
+```
+
+### Routing by intent
+
+Use TypeScript generics to get compile-time intent safety:
+
+```typescript
+type SupportIntent = 'billing' | 'refund' | 'technical' | 'general';
+
+class SupportAgent extends BaseAgent<SupportIntent> {
+  name = 'support-agent';
+  description = 'Customer support assistant';
+  mode = 'chat';
+
+  async invokeAgent(input: AgentInput<SupportIntent>): Promise<AgentResult> {
+    switch (input.intent) {
+      case 'billing':
+        return this.run(`Handle billing query: ${input.message}`);
+      case 'refund':
+        return this.handleRefund(input);
+      default:
+        return this.run(input.message ?? '');
+    }
+  }
+}
+```
+
+### Handling pending asks
+
+When using `ask()` for human-in-the-loop, check for pending asks at the start of `invokeAgent`:
+
+```typescript
+async invokeAgent(input: AgentInput): Promise<AgentResult> {
+  const pending = this.getPendingAsk(input.conversationId);
+  if (pending && input.message) {
+    return this.handlePendingAsk(
+      pending,
+      input.message,
+      (answer) => this.continueWithAnswer(answer),
+    );
+  }
+  // Normal flow...
+  return this.run(input.message ?? '');
+}
+```
+
+---
+
+## run() — calling the LLM
+
+`run()` is the protected helper that drives LLM invocation. It handles:
+
+1. Switching the Toolpack mode to `this.mode`
+2. Loading conversation history via `assemblePrompt()`
+3. Adding a `conversation_search` tool so the LLM can retrieve specific past turns
+4. Calling `toolpack.generate()` with the assembled messages
+5. Emitting lifecycle events
+
+The system prompt comes from `this.mode.systemPrompt` (when `mode` is a `ModeConfig`) and is injected by the Toolpack client — not set as a class-level property.
+
+```typescript
+protected async run(
+  message: string,
+  options?: AgentRunOptions,
+  context?: { conversationId?: string },
+): Promise<AgentResult>
+```
+
+### Passing a conversationId explicitly
+
+When an agent handles multiple concurrent conversations it is safest to pass `conversationId` explicitly via the third argument to avoid a race on the instance-level `_conversationId` field:
+
+```typescript
+async invokeAgent(input: AgentInput): Promise<AgentResult> {
+  return this.run(
+    input.message ?? '',
+    undefined,
+    { conversationId: input.conversationId },
+  );
+}
+```
+
+### conversation_search tool
+
+`run()` automatically exposes a `conversation_search` tool to the LLM whenever a `conversationId` is active. The LLM can call it to retrieve specific past turns beyond the assembled context window.
+
+**Security invariant**: the tool uses a closure-captured `conversationId` and never accepts one from LLM arguments, preventing prompt injection that could reach other conversations.
+
+---
+
+## Lifecycle hooks
+
+Override these no-op hooks in your agent to react to execution stages:
+
+```typescript
+// Called before run() starts — use to validate input or log
+async onBeforeRun(input: AgentInput): Promise<void> {}
+
+// Called after each workflow step completes
+async onStepComplete(step: WorkflowStep): Promise<void> {}
+
+// Called when run() finishes successfully
+async onComplete(result: AgentResult): Promise<void> {}
+
+// Called when run() throws — re-throw to propagate
+async onError(error: Error): Promise<void> {}
+```
+
+Example — logging step progress:
+
+```typescript
+async onStepComplete(step: WorkflowStep): Promise<void> {
+  console.log(`[${this.name}] Step ${step.number}: ${step.description} → ${step.status}`);
+}
+```
+
+---
+
+## Events
+
+`BaseAgent` extends `EventEmitter`. Typed events:
+
+| Event | Payload | When |
+|---|---|---|
+| `agent:start` | `{ message: string }` | Before LLM call |
+| `agent:complete` | `AgentResult` | After successful completion |
+| `agent:error` | `Error` | On any error |
+
+> **Note**: `AgentEvents` also declares `'agent:step'` (payload: `WorkflowStep`) but the built-in `run()` does not currently emit it. If you need per-step callbacks, use the `onStepComplete` lifecycle hook instead.
+
+```typescript
+agent.on('agent:complete', (result) => {
+  metrics.track('agent.complete', { output_length: result.output.length });
+});
+
+agent.on('agent:error', (err) => {
+  alerting.notify('Agent error', err.message);
+});
+```
+
+---
+
+## Single-agent deployment
+
+For a single agent you do not need `AgentRegistry`. Just call `agent.start()` directly.
+
+```typescript
+const agent = new MyAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+
+agent.channels = [
+  new SlackChannel({ name: 'slack', token: '...', signingSecret: '...', channel: '#general' }),
+];
+
+await agent.start();
+
+// When shutting down:
+await agent.stop();
+```
+
+**Note**: Without a registry, `sendTo()`, `ask()`, and `delegate()` will throw because they require `_registry` to be set. To use those features you need `AgentRegistry`.
+
+---
+
+## Built-in concrete agents
+
+Four ready-made agents cover common use cases. Use them directly or extend them.
+
+### ResearchAgent
+
+```typescript
+import { ResearchAgent } from '@toolpack-sdk/agents';
+
+const agent = new ResearchAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+// name: 'research-agent'
+// mode: 'agent'
+// Equipped with web.search, web.fetch, web.scrape tools
+```
+
+Best for: web research, fact-finding, summarisation of online sources.
+
+### CodingAgent
+
+```typescript
+import { CodingAgent } from '@toolpack-sdk/agents';
+
+const agent = new CodingAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+// name: 'coding-agent'
+// mode: 'coding'
+// Equipped with coding.*, fs.*, git.* tools
+```
+
+Best for: code generation, refactoring, testing, code review.
+
+### DataAgent
+
+```typescript
+import { DataAgent } from '@toolpack-sdk/agents';
+
+const agent = new DataAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+// name: 'data-agent'
+// mode: 'agent'
+// Equipped with db.*, fs.*, http.* tools
+```
+
+Best for: database queries, CSV analysis, reporting, data aggregation.
+
+### BrowserAgent
+
+```typescript
+import { BrowserAgent } from '@toolpack-sdk/agents';
+
+const agent = new BrowserAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+// name: 'browser-agent'
+// mode: 'chat'
+// Equipped with web.fetch, web.screenshot, web.extract_links tools
+```
+
+Best for: web interaction, form filling, page content extraction, link following.
+
+### Extending a built-in agent
+
+```typescript
+import { AGENT_MODE } from 'toolpack-sdk';
+
+class MyResearcher extends ResearchAgent {
+  name = 'my-researcher';
+  description = 'Specialized research agent for our domain';
+  mode = {
+    ...AGENT_MODE,
+    systemPrompt: 'You are a specialist in semiconductor industry research...',
+  };
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    // Add pre-processing
+    const enrichedMessage = `[Domain: semiconductors] ${input.message}`;
+    return this.run(enrichedMessage);
+  }
+}
+```
+
+---
+
+## WorkflowStep shape
+
+When Toolpack returns a structured plan, `run()` extracts steps and includes them in `AgentResult.steps`:
+
+```typescript
+interface WorkflowStep {
+  number: number;
+  description: string;
+  status: 'pending' | 'in_progress' | 'completed' | 'failed' | 'skipped';
+  result?: {
+    success: boolean;
+    output?: string;
+    error?: string;
+    toolsUsed?: string[];
+    duration?: number;
+  };
+}
+```
diff --git a/packages/toolpack-agents/docs/capabilities.md b/packages/toolpack-agents/docs/capabilities.md
new file mode 100644
index 0000000..18bb3df
--- /dev/null
+++ b/packages/toolpack-agents/docs/capabilities.md
@@ -0,0 +1,214 @@
+# Capability Agents — IntentClassifier and Summarizer
+
+Capability agents are specialised `BaseAgent` subclasses used internally by interceptors and history assembly. They are not channel-facing — register them without `channels` to use them as pure compute workers.
+
+## Contents
+
+- [IntentClassifierAgent](#intentclassifieragent)
+- [SummarizerAgent](#summarizerAgent)
+- [Using capabilities as standalone agents](#using-capabilities-as-standalone-agents)
+
+---
+
+## IntentClassifierAgent
+
+Classifies whether a message is addressed to a specific agent. Used internally by `createIntentClassifierInterceptor` and `createAddressCheckInterceptor` to handle ambiguous mentions.
+
+### Types
+
+```typescript
+import { IntentClassifierAgent, IntentClassifierInput, IntentClassification } from '@toolpack-sdk/agents';
+
+type IntentClassification = 'direct' | 'indirect' | 'passive' | 'ignore';
+
+interface IntentClassifierInput {
+  message: string;                     // the message to classify
+  agentName: string;                   // agent's display name
+  agentId: string;                     // agent's stable identifier
+  senderName: string;                  // who sent the message
+  channelName: string;                 // channel the message came from
+  isDirectMessage?: boolean;           // true for DMs (lower bar for 'direct')
+  recentContext?: Array<{              // last few turns for context
+    sender: string;
+    content: string;
+  }>;
+  includeExamples?: boolean;           // include few-shot examples in the prompt
+}
+```
+
+### Classification meanings
+
+| Classification | Meaning |
+|---|---|
+| `'direct'` | The agent is the explicit intended recipient |
+| `'indirect'` | The agent is mentioned but not the primary target |
+| `'passive'` | The agent is referenced but not being communicated with |
+| `'ignore'` | The message is clearly not meant for this agent |
+
+### Usage
+
+The classifier is typically invoked automatically by interceptors. For manual use:
+
+```typescript
+const classifier = new IntentClassifierAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+await classifier._ensureToolpack();
+
+const result = await classifier.invokeAgent({
+  data: {
+    message: 'Hey @support can you help me with my order?',
+    agentName: 'support-agent',
+    agentId: 'support-agent',
+    senderName: 'Alice',
+    channelName: 'general',
+    isDirectMessage: false,
+    recentContext: [{ sender: 'Bob', content: 'Good morning everyone' }],
+  } satisfies IntentClassifierInput,
+  conversationId: 'classify-001',
+});
+
+// result.output is 'direct' | 'indirect' | 'passive' | 'ignore'
+const classification = result.output as IntentClassification;
+```
+
+---
+
+## SummarizerAgent
+
+Compresses conversation history into a compact summary. Used by `assemblePrompt()` when the conversation exceeds `rollingSummaryThreshold` turns.
+
+### Types
+
+```typescript
+import { SummarizerAgent, SummarizerInput, SummarizerOutput, HistoryTurn } from '@toolpack-sdk/agents';
+
+interface HistoryTurn {
+  id: string;
+  participant: Participant;
+  content: string;
+  timestamp: string;
+  metadata?: {
+    isToolCall?: boolean;
+    toolName?: string;
+    toolResult?: unknown;
+  };
+}
+
+interface SummarizerInput {
+  turns: HistoryTurn[];                // turns to summarise
+  agentName: string;                   // agent's name (for pronoun resolution)
+  agentId: string;                     // agent's identifier
+  maxTokens?: number;                  // target summary length (default: 500 tokens)
+  extractDecisions?: boolean;          // include key decisions in output
+}
+
+interface SummarizerOutput {
+  summary: string;                     // compressed narrative
+  turnsSummarized: number;             // how many turns were compressed
+  hasDecisions: boolean;               // whether decisions were extracted
+  estimatedTokens: number;             // approximate token count of summary
+}
+```
+
+### Usage
+
+The summarizer is typically invoked automatically by `assemblePrompt()`. For manual use:
+
+```typescript
+import { SummarizerAgent, SummarizerInput } from '@toolpack-sdk/agents';
+
+const summarizer = new SummarizerAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+await summarizer._ensureToolpack();
+
+const result = await summarizer.invokeAgent({
+  data: {
+    turns: olderTurns,                 // HistoryTurn[] to compress
+    agentName: 'support-agent',
+    agentId: 'support-agent',
+    maxTokens: 500,
+    extractDecisions: true,
+  } satisfies SummarizerInput,
+  conversationId: 'summarize-001',
+});
+
+const output = JSON.parse(result.output) as SummarizerOutput;
+console.log(output.summary);
+console.log(`Compressed ${output.turnsSummarized} turns`);
+```
+
+### Wiring into assemblePrompt()
+
+```typescript
+import { assemblePrompt, SummarizerAgent } from '@toolpack-sdk/agents';
+
+// Create summarizer once
+const summarizer = new SummarizerAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+await summarizer._ensureToolpack();
+
+// In your custom history loading logic
+const assembled = await assemblePrompt(
+  store,
+  conversationId,
+  'my-agent',
+  'my-agent',
+  {
+    rollingSummaryThreshold: 30,   // compress when turns > 30
+    tokenBudget: 3000,
+  },
+  summarizer,                       // ← pass the summarizer here
+);
+```
+
+`assemblePrompt()` calls `SummarizerAgent` automatically when the history slice exceeds `rollingSummaryThreshold`. The resulting summary is inserted as a `system` message before the recent turns in the assembled context.
+
+---
+
+## Using capabilities as standalone agents
+
+Register capability agents without channels. They operate purely as compute workers:
+
+```typescript
+const classifier = new IntentClassifierAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+const summarizer = new SummarizerAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+
+const registry = new AgentRegistry([
+  myMainAgent,
+  classifier,    // no channels — pure compute worker
+  summarizer,    // no channels — pure compute worker
+]);
+
+await registry.start();
+
+// Main agent can delegate to them
+// (Usually this happens via interceptors, not direct delegation)
+```
+
+Because they extend `BaseAgent`, they get conversation history, lifecycle hooks, and events — but since they have no channels, they can only be invoked via delegation or the registry.
+
+---
+
+## IntentClassifier vs AddressCheck interceptors
+
+| Feature | `createAddressCheckInterceptor` | `createIntentClassifierInterceptor` |
+|---|---|---|
+| Method | Pattern matching (regex, heuristics) | LLM call |
+| Speed | Fast (no API call) | Slower (API call) |
+| Best for | Clear @-mentions, DMs | Ambiguous natural language |
+| Usage | First-pass filter | Disambiguation of ambiguous cases |
+
+Recommended: chain `createAddressCheckInterceptor` (cheap, pattern-based) immediately before `createIntentClassifierInterceptor` (LLM-based). The intent classifier reads `_addressCheck` from context and only makes an LLM call for `'ambiguous'`/`'indirect'` cases:
+
+```typescript
+agent.interceptors = [
+  createAddressCheckInterceptor({
+    agentName: agent.name,
+    getMessageText: (input) => input.message ?? '',
+  }),
+  createIntentClassifierInterceptor({
+    agentName: agent.name,
+    agentId: agent.name,
+    getMessageText: (input) => input.message ?? '',
+    getSenderName: (input) => input.participant?.displayName ?? 'Unknown',
+    getChannelName: (input) => input.context?.channelName as string ?? 'general',
+  }),
+];
+```
diff --git a/packages/toolpack-agents/docs/channels.md b/packages/toolpack-agents/docs/channels.md
new file mode 100644
index 0000000..f30e088
--- /dev/null
+++ b/packages/toolpack-agents/docs/channels.md
@@ -0,0 +1,380 @@
+# Channels — Connecting Agents to External Systems
+
+Channels normalise incoming events into `AgentInput` and deliver `AgentOutput` back to the external system. Each channel implements the `ChannelInterface`.
+
+## Contents
+
+- [ChannelInterface](#channelinterface)
+- [Trigger vs. conversation channels](#trigger-vs-conversation-channels)
+- [SlackChannel](#slackchannel)
+- [DiscordChannel](#discordchannel)
+- [TelegramChannel](#telegramchannel)
+- [WebhookChannel](#webhookchannel)
+- [ScheduledChannel](#scheduledchannel)
+- [EmailChannel](#emailchannel)
+- [SMSChannel](#smschannel)
+- [Custom channels](#custom-channels)
+
+---
+
+## ChannelInterface
+
+```typescript
+interface ChannelInterface {
+  name?: string;                        // required for sendTo() routing
+  isTriggerChannel: boolean;            // see below
+
+  listen(): void;                       // start accepting messages
+  send(output: AgentOutput): Promise<void>;
+  normalize(incoming: unknown): AgentInput;
+  onMessage(handler: (input: AgentInput) => Promise<void>): void;
+
+  // Optional: resolve richer Participant info (display name, etc.)
+  resolveParticipant?(input: AgentInput): Promise<Participant | undefined> | Participant | undefined;
+}
+```
+
+You do not normally call these methods yourself — `BaseAgent._bindChannel()` and `AgentRegistry` manage the lifecycle.
+
+---
+
+## Trigger vs. conversation channels
+
+| `isTriggerChannel` | Examples | Can use `ask()`? | Has human recipient? |
+|---|---|---|---|
+| `false` | Slack, Discord, Telegram, Webhook | Yes | Yes |
+| `true` | Scheduled, Email, SMS (outbound) | **No** | No |
+
+**Trigger channels** fire the agent on a schedule or external event but have no interactive human on the other end. Calling `ask()` from a trigger channel throws:
+
+```
+AgentError: this.ask() called from a trigger channel (ScheduledChannel).
+Trigger channels have no human recipient — use a conversation channel instead.
+```
+
+---
+
+## SlackChannel
+
+Connects your agent to Slack workspaces via the Events API.
+
+### Install
+
+```bash
+npm install @slack/web-api
+```
+
+### Configuration
+
+```typescript
+import { SlackChannel } from '@toolpack-sdk/agents';
+
+const slack = new SlackChannel({
+  name: 'support-slack',             // required for sendTo() routing
+  token: process.env.SLACK_BOT_TOKEN!,
+  signingSecret: process.env.SLACK_SIGNING_SECRET!,
+
+  // Listen on one channel, multiple channels, or omit to listen to all
+  channel: '#support',                         // single channel (or pass channel ID 'C12345')
+  // channel: ['#support', '#escalations'],    // multiple channels
+  // channel: null,                            // listen to every channel the bot is in
+
+  port: 3000,                                  // port for Slack events webhook (default: 3000)
+
+  // Optional allow/block lists for bot users (matched against bot_id B... or user id U...)
+  allowedBotIds: ['U123ABC'],
+  blockedBotIds: ['U456DEF'],
+});
+```
+
+### What it does
+
+- Starts a plain HTTP server to receive Slack Events API callbacks (built-in, no `@slack/bolt` dependency).
+- On startup, runs `auth.test` to determine `botUserId`. This ID is added as an agent alias so `assemblePrompt` can recognise messages addressed to the bot even when mentioned by its platform ID.
+- Caches `resolveParticipant()` results and invalidates on `user_change` events.
+- Supports thread replies — messages in threads use the thread timestamp as `conversationId`.
+
+### Slack app setup
+
+1. Create a Slack app at https://api.slack.com/apps
+2. Enable **Event Subscriptions** → set Request URL to `https://<your-host>/slack/events`
+3. Subscribe to bot events: `message.channels`, `message.groups`, `app_mention`
+4. Install the app to your workspace
+5. Copy **Bot User OAuth Token** → `SLACK_BOT_TOKEN`
+6. Copy **Signing Secret** → `SLACK_SIGNING_SECRET`
+
+---
+
+## DiscordChannel
+
+Connects your agent to Discord servers via the Gateway (WebSocket) API.
+
+### Install
+
+```bash
+npm install discord.js
+```
+
+### Configuration
+
+```typescript
+import { DiscordChannel } from '@toolpack-sdk/agents';
+
+const discord = new DiscordChannel({
+  name: 'discord',
+  token: process.env.DISCORD_BOT_TOKEN!,
+  guildId: process.env.DISCORD_GUILD_ID!,
+  channelId: process.env.DISCORD_CHANNEL_ID!,
+});
+```
+
+### What it does
+
+- Uses `discord.js` client with `GatewayIntentBits.Guilds`, `GuildMessages`, `MessageContent`, and `DirectMessages`.
+- Normalises Discord messages → `AgentInput` with thread support.
+- Sends responses back to the originating channel.
+
+### Discord bot setup
+
+1. Create an application at https://discord.com/developers/applications
+2. Under **Bot**, generate a token → `DISCORD_BOT_TOKEN`
+3. Enable **Message Content Intent** under Privileged Gateway Intents
+4. Invite the bot to your server with `bot` + `applications.commands` scopes and `Send Messages` permission
+5. Copy the **Server ID** → `DISCORD_GUILD_ID` (right-click server → Copy ID with Developer Mode on)
+6. Copy the **Channel ID** → `DISCORD_CHANNEL_ID`
+
+---
+
+## TelegramChannel
+
+Connects your agent to Telegram via bot polling or webhooks.
+
+### Install
+
+```bash
+npm install node-telegram-bot-api
+```
+
+### Configuration
+
+```typescript
+import { TelegramChannel } from '@toolpack-sdk/agents';
+
+const telegram = new TelegramChannel({
+  name: 'telegram',
+  token: process.env.TELEGRAM_BOT_TOKEN!,
+
+  // Optional: use webhook instead of polling
+  // webhookUrl: 'https://your-server.com/telegram/webhook',
+});
+```
+
+### What it does
+
+- On startup, calls `getMe` to populate `botUserId` and `botUsername`.
+- Supports both polling (development) and webhook (production) modes.
+- Sends text messages via the Telegram Bot API.
+
+### Telegram bot setup
+
+1. Message `@BotFather` on Telegram
+2. Run `/newbot` and follow the prompts
+3. Copy the token → `TELEGRAM_BOT_TOKEN`
+
+---
+
+## WebhookChannel
+
+Exposes an HTTP endpoint. Any HTTP POST to the endpoint triggers the agent.
+
+### Configuration
+
+```typescript
+import { WebhookChannel } from '@toolpack-sdk/agents';
+
+const webhook = new WebhookChannel({
+  name: 'api-webhook',
+  path: '/api/agent',          // HTTP path
+  port: 4000,                  // HTTP port (default: 3000)
+});
+```
+
+### Request format
+
+Send a POST request with JSON body:
+
+```json
+{
+  "message": "Summarise the quarterly report",
+  "conversationId": "session-abc",
+  "context": { "userId": "user-123" }
+}
+```
+
+The channel responds synchronously — the HTTP response body is the agent's output.
+
+### Response format
+
+```json
+{
+  "output": "The quarterly report shows...",
+  "metadata": { "conversationId": "session-abc" }
+}
+```
+
+---
+
+## ScheduledChannel
+
+Triggers an agent on a cron schedule.
+
+### Configuration
+
+```typescript
+import { ScheduledChannel } from '@toolpack-sdk/agents';
+
+const daily = new ScheduledChannel({
+  name: 'daily-report',
+  cron: '0 9 * * 1-5',           // 9am Monday–Friday
+  message: 'Generate the daily standup summary',
+  intent: 'daily_summary',        // optional intent hint
+  notify: 'webhook:https://hooks.example.com/daily',
+});
+```
+
+`cron` accepts standard 5-field cron syntax. The expression is validated on construction — an invalid expression throws immediately.
+
+### `notify` targets
+
+| Prefix | Behaviour |
+|---|---|
+| `webhook:<url>` | POSTs `{ output, metadata, timestamp }` as JSON to the URL |
+
+For routing output to a Slack or other channel, attach both channels to the same agent and use `sendTo()` from `invokeAgent()`:
+
+```typescript
+agent.channels = [
+  new ScheduledChannel({ name: 'daily', cron: '0 9 * * 1-5', notify: 'webhook:...' }),
+  new SlackChannel({ name: 'team-slack', channel: '#standups', token, signingSecret }),
+];
+
+async invokeAgent(input: AgentInput): Promise<AgentResult> {
+  const report = await this.buildReport();
+  await this.sendTo('team-slack', report);   // route to Slack
+  return { output: report };
+}
+```
+
+This keeps all Slack credentials and thread routing in `SlackChannel` rather than duplicated inside `ScheduledChannel`.
+
+### isTriggerChannel
+
+`ScheduledChannel.isTriggerChannel` is `true`. Calling `ask()` from within a scheduled invocation throws because there is no human to answer.
+
+---
+
+## EmailChannel
+
+Outbound-only email delivery.
+
+### Install
+
+```bash
+npm install nodemailer
+```
+
+### Configuration
+
+```typescript
+import { EmailChannel } from '@toolpack-sdk/agents';
+
+const email = new EmailChannel({
+  name: 'email-alerts',
+  from: 'agent@example.com',
+  to: 'team@example.com',
+  smtp: {
+    host: 'smtp.example.com',
+    port: 587,
+    auth: {
+      user: process.env.SMTP_USER!,
+      pass: process.env.SMTP_PASS!,
+    },
+  },
+});
+```
+
+`isTriggerChannel = true`. Use this for sending outbound email notifications from your agent.
+
+For inbound email, set up an email parsing service and deliver the payload to a `WebhookChannel`.
+
+---
+
+## SMSChannel
+
+Bidirectional SMS via Twilio.
+
+### Install
+
+```bash
+npm install twilio
+```
+
+### Configuration
+
+```typescript
+import { SMSChannel } from '@toolpack-sdk/agents';
+
+const sms = new SMSChannel({
+  name: 'sms',
+  accountSid: process.env.TWILIO_ACCOUNT_SID!,
+  authToken: process.env.TWILIO_AUTH_TOKEN!,
+  from: process.env.TWILIO_FROM_NUMBER!,
+
+  // Optional: recipient number for outbound-only SMS
+  // to: '+15551234567',
+
+  // Optional: HTTP path to receive inbound SMS (makes channel bidirectional)
+  // webhookPath: '/sms/webhook',
+  // port: 3000,  // default: 3000
+});
+```
+
+`isTriggerChannel` is **dynamic**: `true` when `webhookPath` is not set (outbound-only), `false` when `webhookPath` is set (bidirectional). Sends SMS via the Twilio REST API.
+
+---
+
+## Custom channels
+
+Implement `ChannelInterface` (or extend `BaseChannel`) to connect any data source:
+
+```typescript
+import { BaseChannel, AgentInput, AgentOutput } from '@toolpack-sdk/agents';
+
+class KafkaChannel extends BaseChannel {
+  readonly isTriggerChannel = false;
+
+  constructor(private config: { topic: string; brokers: string[] }) {
+    super();
+    this.name = 'kafka';
+  }
+
+  listen(): void {
+    // Subscribe to Kafka topic, call this._messageHandler(this.normalize(msg))
+  }
+
+  async send(output: AgentOutput): Promise<void> {
+    // Produce to Kafka response topic
+  }
+
+  normalize(incoming: unknown): AgentInput {
+    const msg = incoming as KafkaMessage;
+    return {
+      message: msg.value.toString(),
+      conversationId: msg.key?.toString() ?? `kafka-${Date.now()}`,
+      participant: { kind: 'user', id: msg.headers?.userId ?? 'unknown' },
+    };
+  }
+}
+```
+
+`BaseChannel` provides the `onMessage()` registration and `_messageHandler` field — call `this._messageHandler(input)` when a message arrives.
diff --git a/packages/toolpack-agents/docs/conversation-history.md b/packages/toolpack-agents/docs/conversation-history.md
new file mode 100644
index 0000000..4df3bb5
--- /dev/null
+++ b/packages/toolpack-agents/docs/conversation-history.md
@@ -0,0 +1,379 @@
+# Conversation History
+
+`toolpack-agents` provides a built-in conversation history system. Every agent gets an `InMemoryConversationStore` by default. History is written automatically by the capture interceptor and read by `assemblePrompt()` before each LLM call.
+
+## Contents
+
+- [How history flows](#how-history-flows)
+- [ConversationStore interface](#conversationstore-interface)
+- [InMemoryConversationStore](#inmemoryconversationstore)
+- [StoredMessage shape](#storedmessage-shape)
+- [assemblePrompt()](#assembleprompt)
+- [AssemblerOptions reference](#assembleroptions-reference)
+- [Addressed-only mode](#addressed-only-mode)
+- [Rolling summarisation](#rolling-summarisation)
+- [conversation_search tool](#conversation_search-tool)
+- [Replacing with a persistent store](#replacing-with-a-persistent-store)
+
+---
+
+## How history flows
+
+```
+Inbound message (from channel)
+        │
+        ▼
+  CaptureInterceptor  ────────────────► ConversationStore.append()
+  (auto-prepended)                      (inbound turn recorded)
+        │
+        ▼
+  invokeAgent() → run()
+        │
+        ├── assemblePrompt() ──────────► ConversationStore.get()
+        │   (builds LLM context)         (loads recent history)
+        │
+        ▼
+  toolpack.generate()
+        │
+        ▼
+  AgentResult.output
+        │
+        ▼
+  CaptureInterceptor  ────────────────► ConversationStore.append()
+  (after agent returns)                 (outbound turn recorded)
+        │
+        ▼
+  channel.send()
+```
+
+The capture interceptor is **automatically prepended** to the interceptor chain. You do not need to configure it manually. History writes are non-fatal — a failed `append()` never crashes the agent.
+
+---
+
+## ConversationStore interface
+
+```typescript
+interface ConversationStore {
+  append(message: StoredMessage): Promise<void>;
+  get(conversationId: string, opts?: GetOptions): Promise<StoredMessage[]>;
+  search(conversationId: string, query: string, opts?: SearchOptions): Promise<StoredMessage[]>;
+  deleteMessages(conversationId: string, ids: string[]): Promise<void>;
+}
+
+interface GetOptions {
+  scope?: ConversationScope;            // 'channel' | 'dm' | 'thread'
+  sinceTimestamp?: string;              // ISO 8601 — only return messages after this timestamp
+  limit?: number;
+  participantIds?: string[];            // filter to messages from these participant IDs
+}
+
+interface SearchOptions {
+  limit?: number;                       // default: 10
+  tokenCap?: number;                    // max tokens across results (default: 2000)
+}
+```
+
+---
+
+## InMemoryConversationStore
+
+The default store. Keeps all messages in process memory.
+
+```typescript
+import { InMemoryConversationStore } from '@toolpack-sdk/agents';
+
+const store = new InMemoryConversationStore({
+  maxConversations: 500,            // max distinct conversations kept (default: 500)
+  maxMessagesPerConversation: 500,  // max messages per conversation (default: 500)
+});
+```
+
+Assign it explicitly to control the capacity:
+
+```typescript
+class MyAgent extends BaseAgent {
+  name = 'my-agent';
+  description = '...';
+  mode = 'chat';
+
+  conversationHistory = new InMemoryConversationStore({ maxMessagesPerConversation: 200 });
+}
+```
+
+**For production deployments** replace with a database-backed implementation. See [Replacing with a persistent store](#replacing-with-a-persistent-store).
+
+---
+
+## StoredMessage shape
+
+```typescript
+interface StoredMessage {
+  id: string;                           // UUID
+  conversationId: string;               // thread/session identifier
+  participant: Participant;             // who sent this
+  content: string;                      // message text
+  timestamp: string;                    // ISO 8601
+  scope: ConversationScope;             // 'channel' | 'dm' | 'thread'
+  metadata?: {
+    channelType?: string;               // channel platform (e.g. 'slack', 'discord')
+    channelName?: string;               // channel name or identifier
+    channelId?: string;                 // channel platform ID
+    threadId?: string;                  // thread/parent message ID
+    messageId?: string;                 // platform-specific message ID
+    mentions?: string[];                // agent IDs mentioned in this message
+    isSummary?: boolean;                // true for rolling-summary placeholder turns
+  };
+}
+
+// Participant shape (from toolpack-sdk)
+interface Participant {
+  kind: 'user' | 'agent' | 'system';
+  id: string;
+  displayName?: string;
+}
+
+type ConversationScope = 'channel' | 'dm' | 'thread';
+```
+
+### Participant kinds
+
+| Kind | Who writes it | LLM role in assembled prompt |
+|---|---|---|
+| `'user'` | Human end-users | `user` (prefixed with display name) |
+| `'agent'` | This agent | `assistant` |
+| `'agent'` (other) | Peer agents | `user` (prefixed with agent name + `(agent)`) |
+| `'system'` | System messages | `system` |
+
+---
+
+## assemblePrompt()
+
+`assemblePrompt()` is called inside `run()` to build the message array sent to the LLM. It applies filtering, projection, token budgeting, and optional rolling summarisation.
+
+```typescript
+import { assemblePrompt } from '@toolpack-sdk/agents';
+
+const assembled = await assemblePrompt(
+  store,            // ConversationStore
+  conversationId,   // string
+  agentId,          // agent's stable name/id (e.g. 'support-agent')
+  agentName,        // display name for the LLM (usually same as agentId)
+  options,          // AssemblerOptions (see below)
+  summarizer,       // optional SummarizerAgent for rolling compression
+);
+
+// assembled.messages is Array<{ role: 'system'|'user'|'assistant', content: string }>
+// Pass assembled.messages directly to toolpack.generate()
+```
+
+### What assemblePrompt does step-by-step
+
+1. **Load history slice** — calls `store.get(conversationId, { scope, before, after, limit })`.
+2. **Filter to relevant turns** (when `addressedOnlyMode = true`) — keeps only turns where:
+   - The agent authored the turn (`participant.id === agentId`), OR
+   - The agent was mentioned (`metadata.mentions` contains `agentId` or any of `agentAliases`)
+3. **Project messages** — converts `StoredMessage` → `PromptMessage` from the agent's perspective (see table above).
+4. **Rolling summarisation** — if turn count exceeds `rollingSummaryThreshold` and a `SummarizerAgent` is provided, older turns are compressed into a summary message.
+5. **Token budget** — fills messages from most-recent to oldest until `tokenBudget` is exceeded. Token count is estimated as `characters / 4`.
+6. **Return** `AssembledPrompt` with `messages[]` ready to spread into the LLM call.
+
+---
+
+## AssemblerOptions reference
+
+```typescript
+interface AssemblerOptions {
+  scope?: ConversationScope;              // filter by scope (default: all)
+  tokenBudget?: number;                   // max tokens for history (default: 3000)
+  addressedOnlyMode?: boolean;            // filter to relevant turns (default: true)
+  rollingSummaryThreshold?: number;       // compress when turns exceed this (default: 40)
+  timeWindowMinutes?: number;             // ignore turns older than N minutes
+  maxTurnsToLoad?: number;                // max turns to fetch from store (default: 100)
+  agentAliases?: string[];               // platform bot IDs (e.g. Slack botUserId)
+}
+```
+
+### Agent aliases
+
+Slack and Telegram use platform-specific user IDs for bot mentions (e.g. `U123BOT`) which differ from the agent's `name` string. Set `agentAliases` (or let `BaseAgent` auto-populate from attached channels) so `assemblePrompt` recognises those mentions:
+
+```typescript
+agent.assemblerOptions = {
+  agentAliases: ['U123BOT', 'telegram-bot-456'],
+};
+```
+
+`BaseAgent._resolveAssemblerOptions()` auto-collects `botUserId` from channels that expose it (SlackChannel, TelegramChannel) and merges them with any manually specified aliases.
+
+---
+
+## Addressed-only mode
+
+When `addressedOnlyMode: true` (the default), the assembler keeps only history turns where the agent was directly involved. This:
+
+- Prevents loading irrelevant multi-party chatter into the context window
+- Saves tokens in busy group channels
+- Keeps the LLM focused on the relevant conversation thread
+
+Turn `addressedOnlyMode` off only when you need full channel history — for example, a monitoring agent that analyses all traffic:
+
+```typescript
+agent.assemblerOptions = { addressedOnlyMode: false };
+```
+
+---
+
+## Rolling summarisation
+
+When history is long, the assembler can compress older turns into a summary rather than truncating them. Provide a `SummarizerAgent` to enable this:
+
+```typescript
+import { SummarizerAgent } from '@toolpack-sdk/agents';
+
+// Create a dedicated summarizer
+const summarizer = new SummarizerAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+await summarizer._ensureToolpack();
+
+// Pass it to assemblePrompt (run() does not support this yet — call assemblePrompt manually)
+const assembled = await assemblePrompt(
+  store, conversationId, agent.name, agent.name,
+  { rollingSummaryThreshold: 30, tokenBudget: 3000 },
+  summarizer,
+);
+```
+
+When `rollingSummaryThreshold` is exceeded, `SummarizerAgent` receives the oldest turns and returns a compact summary. The summary is inserted as a `system` message before the recent turns.
+
+See [capabilities.md](capabilities.md) for the full `SummarizerAgent` API.
+
+---
+
+## conversation_search tool
+
+`run()` automatically exposes a `conversation_search` tool to the LLM when a `conversationId` is active. The LLM can invoke it to retrieve specific past turns beyond the assembled context window.
+
+The tool is defined as:
+
+```
+name: conversation_search
+parameters:
+  query: string    (keywords or phrases to search for)
+  limit: number    (max results, default 5)
+```
+
+**Security note**: The tool uses a closure-captured `conversationId`. The LLM cannot supply or override the conversation ID, which prevents adversarial prompts from accessing other users' history.
+
+---
+
+## Replacing with a persistent store
+
+For production, replace `InMemoryConversationStore` with a database-backed implementation. Implement the `ConversationStore` interface:
+
+```typescript
+import { ConversationStore, StoredMessage, GetOptions, SearchOptions } from '@toolpack-sdk/agents';
+import Database from 'better-sqlite3';
+
+class SQLiteConversationStore implements ConversationStore {
+  private db: Database.Database;
+
+  constructor(path: string) {
+    this.db = new Database(path);
+    this.db.exec(`
+      CREATE TABLE IF NOT EXISTS messages (
+        id TEXT PRIMARY KEY,
+        conversation_id TEXT NOT NULL,
+        participant_kind TEXT NOT NULL,
+        participant_id TEXT NOT NULL,
+        participant_display_name TEXT,
+        content TEXT NOT NULL,
+        timestamp TEXT NOT NULL,
+        scope TEXT NOT NULL,
+        metadata TEXT
+      );
+      CREATE INDEX IF NOT EXISTS idx_conv ON messages(conversation_id);
+    `);
+  }
+
+  async append(message: StoredMessage): Promise<void> {
+    this.db.prepare(`
+      INSERT OR IGNORE INTO messages VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)
+    `).run(
+      message.id,
+      message.conversationId,
+      message.participant.kind,
+      message.participant.id,
+      message.participant.displayName ?? null,
+      message.content,
+      message.timestamp,
+      message.scope,
+      message.metadata ? JSON.stringify(message.metadata) : null,
+    );
+  }
+
+  async get(conversationId: string, opts: GetOptions = {}): Promise<StoredMessage[]> {
+    const rows = this.db.prepare(
+      `SELECT * FROM messages WHERE conversation_id = ?
+       ${opts.sinceTimestamp ? 'AND timestamp > ?' : ''}
+       ORDER BY timestamp ASC LIMIT ?`
+    ).all(
+      ...[conversationId, opts.sinceTimestamp, opts.limit ?? 100].filter(Boolean),
+    );
+    return rows.map(this.toStoredMessage);
+  }
+
+  async search(conversationId: string, query: string, opts: SearchOptions = {}): Promise<StoredMessage[]> {
+    const rows = this.db.prepare(
+      `SELECT * FROM messages WHERE conversation_id = ? AND content LIKE ? LIMIT ?`
+    ).all(conversationId, `%${query}%`, opts.limit ?? 10);
+    return rows.map(this.toStoredMessage);
+  }
+
+  async deleteMessages(conversationId: string, ids: string[]): Promise<void> {
+    const placeholders = ids.map(() => '?').join(', ');
+    this.db.prepare(
+      `DELETE FROM messages WHERE conversation_id = ? AND id IN (${placeholders})`
+    ).run(conversationId, ...ids);
+  }
+
+  private toStoredMessage(row: Record<string, unknown>): StoredMessage {
+    return {
+      id: row.id as string,
+      conversationId: row.conversation_id as string,
+      participant: {
+        kind: row.participant_kind as 'user' | 'agent' | 'system',
+        id: row.participant_id as string,
+        displayName: row.participant_display_name as string | undefined,
+      },
+      content: row.content as string,
+      timestamp: row.timestamp as string,
+      scope: row.scope as 'channel' | 'dm' | 'thread',
+      metadata: row.metadata ? JSON.parse(row.metadata as string) : undefined,
+    };
+  }
+}
+```
+
+Then assign it to your agent:
+
+```typescript
+class MyAgent extends BaseAgent {
+  name = 'my-agent';
+  description = '...';
+  mode = 'chat';
+
+  conversationHistory = new SQLiteConversationStore('./conversations.db');
+}
+```
+
+### Sharing a store across agents
+
+Multiple agents can share the same store. History is scoped by `conversationId`, so agents in the same conversation see each other's messages:
+
+```typescript
+const store = new SQLiteConversationStore('./shared.db');
+
+agentA.conversationHistory = store;
+agentB.conversationHistory = store;
+```
+
+This is the foundation for multi-agent conversation continuity.
diff --git a/packages/toolpack-agents/docs/examples.md b/packages/toolpack-agents/docs/examples.md
new file mode 100644
index 0000000..2fc3f62
--- /dev/null
+++ b/packages/toolpack-agents/docs/examples.md
@@ -0,0 +1,536 @@
+# Examples — End-to-End Agent Patterns
+
+## Contents
+
+- [1. Single agent on Slack](#1-single-agent-on-slack)
+- [2. Multi-agent system with delegation](#2-multi-agent-system-with-delegation)
+- [3. Scheduled digest with Slack delivery](#3-scheduled-digest-with-slack-delivery)
+- [4. Support agent with human-in-the-loop](#4-support-agent-with-human-in-the-loop)
+- [5. Research + coding pipeline](#5-research--coding-pipeline)
+- [6. Webhook-driven API agent](#6-webhook-driven-api-agent)
+- [7. Multi-channel agent (Slack + Telegram)](#7-multi-channel-agent-slack--telegram)
+
+---
+
+## 1. Single agent on Slack
+
+The simplest deployment: one agent, one channel, no registry.
+
+```typescript
+import {
+  BaseAgent, AgentInput, AgentResult,
+  SlackChannel,
+  createEventDedupInterceptor,
+  createSelfFilterInterceptor,
+  createNoiseFilterInterceptor,
+} from '@toolpack-sdk/agents';
+import { CHAT_MODE } from 'toolpack-sdk';
+
+class AssistantAgent extends BaseAgent {
+  name = 'assistant';
+  description = 'General-purpose assistant';
+  mode = { ...CHAT_MODE, systemPrompt: 'You are a helpful assistant. Be concise and clear.' };
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    return this.run(input.message ?? '');
+  }
+}
+
+const slack = new SlackChannel({
+  name: 'main',
+  token: process.env.SLACK_BOT_TOKEN!,
+  signingSecret: process.env.SLACK_SIGNING_SECRET!,
+  channel: '#general',
+  port: 3000,
+});
+
+const agent = new AssistantAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+agent.channels = [slack];
+agent.interceptors = [
+  createEventDedupInterceptor(),
+  createNoiseFilterInterceptor({ denySubtypes: ['bot_message', 'message_changed'] }),
+  createSelfFilterInterceptor({
+    agentId: 'assistant',
+    getSenderId: (input) => input.context?.userId as string,
+  }),
+];
+
+await agent.start();
+console.log('Assistant is listening on Slack #general');
+
+// Graceful shutdown
+process.on('SIGTERM', () => agent.stop());
+```
+
+---
+
+## 2. Multi-agent system with delegation
+
+An orchestrator that delegates specialised tasks to a research agent and a data agent.
+
+```typescript
+import {
+  BaseAgent, AgentInput, AgentResult,
+  AgentRegistry,
+  ResearchAgent, DataAgent,
+  SlackChannel,
+  createEventDedupInterceptor,
+  createSelfFilterInterceptor,
+  createAddressCheckInterceptor,
+} from '@toolpack-sdk/agents';
+
+class OrchestratorAgent extends BaseAgent {
+  name = 'orchestrator';
+  description = 'Routes tasks to the right specialist agent';
+  mode = 'chat';
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    const message = input.message ?? '';
+
+    // Classify intent
+    if (/research|find|search|what is/i.test(message)) {
+      const result = await this.delegateAndWait('research-agent', {
+        message,
+        conversationId: input.conversationId,
+      });
+      return result;
+    }
+
+    if (/data|analyse|report|csv|database/i.test(message)) {
+      // Fire-and-forget for long-running analysis
+      await this.delegate('data-agent', {
+        message,
+        conversationId: input.conversationId,
+      });
+      return { output: 'Data analysis started. I will post the results shortly.' };
+    }
+
+    return this.run(message);
+  }
+}
+
+// Shared Slack channel
+const slack = new SlackChannel({
+  name: 'work-slack',
+  token: process.env.SLACK_BOT_TOKEN!,
+  signingSecret: process.env.SLACK_SIGNING_SECRET!,
+  channel: '#work',
+});
+
+const commonInterceptors = [
+  createEventDedupInterceptor(),
+  createSelfFilterInterceptor({
+    agentId: 'orchestrator',
+    getSenderId: (input) => input.context?.userId as string,
+  }),
+];
+
+// Orchestrator listens on Slack
+const orchestrator = new OrchestratorAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+orchestrator.channels = [slack];
+orchestrator.interceptors = [
+  ...commonInterceptors,
+  createAddressCheckInterceptor({
+    agentName: 'orchestrator',
+    getMessageText: (input) => input.message ?? '',
+  }),
+];
+
+// Specialist agents — no channels, invoked via delegation only
+const researcher = new ResearchAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+const dataAgent = new DataAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+
+const registry = new AgentRegistry([orchestrator, researcher, dataAgent]);
+await registry.start();
+```
+
+---
+
+## 3. Scheduled digest with Slack delivery
+
+A daily digest that runs on a cron schedule and posts to Slack.
+
+```typescript
+import {
+  BaseAgent, AgentInput, AgentResult,
+  AgentRegistry,
+  ScheduledChannel, SlackChannel,
+  ResearchAgent,
+} from '@toolpack-sdk/agents';
+import { AGENT_MODE } from 'toolpack-sdk';
+
+class DigestAgent extends BaseAgent {
+  name = 'digest-agent';
+  description = 'Generates and posts daily digests';
+  mode = { ...AGENT_MODE, systemPrompt: 'You compile concise, informative daily news digests.' };
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    // Research today's top news
+    const news = await this.delegateAndWait('research-agent', {
+      message: 'Find the top 5 technology news stories from the past 24 hours. Be concise.',
+    });
+
+    // Format the digest
+    const digest = await this.run(
+      `Format this news into a clean Slack digest:\n\n${news.output}`
+    );
+
+    // Post to Slack
+    await this.sendTo('digest-slack', digest.output);
+
+    return digest;
+  }
+}
+
+const scheduledChannel = new ScheduledChannel({
+  name: 'daily-trigger',
+  cron: '0 8 * * 1-5',                            // 8am Monday–Friday
+  message: 'Generate the daily tech digest',
+  notify: 'webhook:https://hooks.example.com/ack', // acknowledge trigger
+});
+
+const slackDelivery = new SlackChannel({
+  name: 'digest-slack',
+  token: process.env.SLACK_BOT_TOKEN!,
+  signingSecret: process.env.SLACK_SIGNING_SECRET!,
+  channel: '#daily-digest',
+});
+
+const digestAgent = new DigestAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+digestAgent.channels = [scheduledChannel, slackDelivery];
+
+const researcher = new ResearchAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+
+const registry = new AgentRegistry([digestAgent, researcher]);
+await registry.start();
+```
+
+---
+
+## 4. Support agent with human-in-the-loop
+
+A customer support agent that asks for confirmation before processing sensitive actions.
+
+```typescript
+import {
+  BaseAgent, AgentInput, AgentResult,
+  AgentRegistry,
+  SlackChannel,
+  createEventDedupInterceptor,
+  createRateLimitInterceptor,
+} from '@toolpack-sdk/agents';
+import { CHAT_MODE } from 'toolpack-sdk';
+
+type SupportIntent = 'refund' | 'cancel' | 'general';
+
+class SupportAgent extends BaseAgent<SupportIntent> {
+  name = 'support-agent';
+  description = 'Customer support with approval workflows';
+  mode = {
+    ...CHAT_MODE,
+    systemPrompt: 'You are a customer support agent. You help customers with orders, refunds, and issues. Always be empathetic and professional.',
+  };
+
+  async invokeAgent(input: AgentInput<SupportIntent>): Promise<AgentResult> {
+    // Check for pending ask replies first
+    const pending = this.getPendingAsk(input.conversationId);
+    if (pending && input.message) {
+      return this.handlePendingAsk(
+        pending,
+        input.message,
+        async (orderNumber) => {
+          const action = pending.context.action as string;
+          if (action === 'refund') {
+            // Process refund
+            await this.run(`Process refund for order number: ${orderNumber}`);
+            return { output: `✅ Refund for order ${orderNumber} has been submitted. You'll receive a confirmation email within 24 hours.` };
+          }
+          if (action === 'cancel') {
+            await this.run(`Cancel order: ${orderNumber}`);
+            return { output: `✅ Order ${orderNumber} has been cancelled.` };
+          }
+          return { output: 'Action completed.' };
+        },
+        async () => ({
+          output: '❌ I was unable to complete the action without a valid order number. Please try again and provide your order number.',
+        }),
+      );
+    }
+
+    // Route by intent
+    switch (input.intent) {
+      case 'refund':
+        return this.ask('To process your refund, I need your order number. What is it?', {
+          context: { action: 'refund', requestedAt: new Date().toISOString() },
+          maxRetries: 3,
+          expiresIn: 30 * 60 * 1000,  // 30 minutes
+        });
+
+      case 'cancel':
+        return this.ask('I can cancel that order. What is the order number you would like to cancel?', {
+          context: { action: 'cancel' },
+          maxRetries: 2,
+        });
+
+      default:
+        return this.run(input.message ?? '');
+    }
+  }
+}
+
+const slack = new SlackChannel({
+  name: 'support',
+  token: process.env.SLACK_BOT_TOKEN!,
+  signingSecret: process.env.SLACK_SIGNING_SECRET!,
+  channel: ['#support', '#customer-help'],
+});
+
+const agent = new SupportAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+agent.channels = [slack];
+agent.interceptors = [
+  createEventDedupInterceptor(),
+  createRateLimitInterceptor({
+    getKey: (input) => input.participant?.id ?? input.conversationId ?? 'global',
+    tokensPerInterval: 30,
+    interval: 60000,
+  }),
+];
+
+const registry = new AgentRegistry([agent]);
+await registry.start();
+```
+
+---
+
+## 5. Research + coding pipeline
+
+An agent that researches a topic, then generates code based on the findings.
+
+```typescript
+import {
+  BaseAgent, AgentInput, AgentResult,
+  AgentRegistry,
+  ResearchAgent, CodingAgent,
+  WebhookChannel,
+} from '@toolpack-sdk/agents';
+
+class ProjectAgent extends BaseAgent {
+  name = 'project-agent';
+  description = 'Researches topics and generates implementation code';
+  mode = 'chat';
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    const task = input.message ?? '';
+
+    // Step 1: Research
+    const research = await this.delegateAndWait('research-agent', {
+      message: `Research best practices and common patterns for: ${task}`,
+      conversationId: input.conversationId,
+    });
+
+    // Step 2: Generate implementation
+    const implementation = await this.delegateAndWait('coding-agent', {
+      message: `Based on this research, implement the following in TypeScript:\n\n${task}\n\nResearch context:\n${research.output}`,
+      conversationId: input.conversationId,
+    });
+
+    // Step 3: Summarise
+    const summary = await this.run(
+      `Summarise what was built:\n\n${implementation.output}`,
+      undefined,
+      { conversationId: input.conversationId },
+    );
+
+    return {
+      output: `## Research\n${research.output}\n\n## Implementation\n${implementation.output}\n\n## Summary\n${summary.output}`,
+      metadata: {
+        steps: ['research', 'implementation', 'summary'],
+      },
+    };
+  }
+}
+
+const webhook = new WebhookChannel({
+  name: 'api',
+  path: '/api/project',
+  port: 4000,
+});
+
+const projectAgent = new ProjectAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+projectAgent.channels = [webhook];
+
+const researcher = new ResearchAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+const coder = new CodingAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+
+const registry = new AgentRegistry([projectAgent, researcher, coder]);
+await registry.start();
+
+// POST http://localhost:4000/api/project
+// { "message": "Build a simple in-memory key-value store with TTL support" }
+```
+
+---
+
+## 6. Webhook-driven API agent
+
+Expose an agent as a stateless HTTP API endpoint.
+
+```typescript
+import {
+  BaseAgent, AgentInput, AgentResult,
+  WebhookChannel,
+  DataAgent,
+} from '@toolpack-sdk/agents';
+
+class APIAgent extends BaseAgent {
+  name = 'api-agent';
+  description = 'Processes API requests and returns structured responses';
+  mode = 'agent';
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    const payload = input.data as {
+      action: 'query' | 'summarise' | 'analyse';
+      content: string;
+    };
+
+    switch (payload?.action) {
+      case 'query':
+        return this.run(`Answer this query precisely: ${payload.content}`);
+
+      case 'summarise':
+        return this.run(`Summarise the following text in 3 bullet points:\n\n${payload.content}`);
+
+      case 'analyse':
+        return this.delegateAndWait('data-agent', {
+          message: `Analyse this data and provide insights:\n\n${payload.content}`,
+          conversationId: input.conversationId,
+        });
+
+      default:
+        return this.run(input.message ?? 'Hello');
+    }
+  }
+}
+
+const webhook = new WebhookChannel({
+  name: 'api',
+  path: '/api/v1/agent',
+  port: 8080,
+});
+
+const apiAgent = new APIAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+apiAgent.channels = [webhook];
+
+const dataAgent = new DataAgent({ apiKey: process.env.ANTHROPIC_API_KEY! });
+// data-agent has no channels — invoked only via delegation
+
+await new AgentRegistry([apiAgent, dataAgent]).start();
+```
+
+Calling the API:
+
+```bash
+curl -X POST http://localhost:8080/api/v1/agent \
+  -H "Content-Type: application/json" \
+  -d '{ "action": "summarise", "content": "Long text to summarise..." }'
+```
+
+---
+
+## 7. Multi-channel agent (Slack + Telegram)
+
+One agent listening on multiple channels simultaneously.
+
+```typescript
+import {
+  BaseAgent, AgentInput, AgentResult,
+  SlackChannel, TelegramChannel,
+  createEventDedupInterceptor,
+  createSelfFilterInterceptor,
+  createParticipantResolverInterceptor,
+} from '@toolpack-sdk/agents';
+import { CHAT_MODE } from 'toolpack-sdk';
+
+class MultiChannelAssistant extends BaseAgent {
+  name = 'multi-assistant';
+  description = 'Assistant available on Slack and Telegram';
+  mode = { ...CHAT_MODE, systemPrompt: 'You are a helpful assistant available across multiple platforms.' };
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    // input.participant.displayName is resolved for both Slack and Telegram
+    const userName = input.participant?.displayName ?? 'there';
+    const channel = input.context?.channel ?? 'unknown';
+
+    const result = await this.run(
+      input.message ?? '',
+      undefined,
+      { conversationId: input.conversationId },
+    );
+
+    return {
+      output: result.output,
+      metadata: { respondedTo: userName, via: channel },
+    };
+  }
+}
+
+const slack = new SlackChannel({
+  name: 'slack',
+  token: process.env.SLACK_BOT_TOKEN!,
+  signingSecret: process.env.SLACK_SIGNING_SECRET!,
+  channel: '#general',
+});
+
+const telegram = new TelegramChannel({
+  name: 'telegram',
+  token: process.env.TELEGRAM_BOT_TOKEN!,
+});
+
+const agent = new MultiChannelAssistant({ apiKey: process.env.ANTHROPIC_API_KEY! });
+agent.channels = [slack, telegram];
+agent.interceptors = [
+  createEventDedupInterceptor(),
+  createSelfFilterInterceptor({
+    agentId: 'multi-assistant',
+    getSenderId: (input) => input.context?.userId as string,
+  }),
+  createParticipantResolverInterceptor(),  // resolves display names for both channels
+];
+
+// Single start() — agent listens on both platforms simultaneously
+await agent.start();
+console.log('Assistant listening on Slack and Telegram');
+```
+
+---
+
+## Environment variable reference
+
+Most examples rely on these environment variables:
+
+```bash
+# Anthropic API
+ANTHROPIC_API_KEY=sk-ant-...
+
+# Slack
+SLACK_BOT_TOKEN=xoxb-...
+SLACK_SIGNING_SECRET=...
+
+# Discord
+DISCORD_BOT_TOKEN=...
+DISCORD_GUILD_ID=...
+DISCORD_CHANNEL_ID=...
+
+# Telegram
+TELEGRAM_BOT_TOKEN=...
+
+# Twilio SMS
+TWILIO_ACCOUNT_SID=AC...
+TWILIO_AUTH_TOKEN=...
+TWILIO_FROM_NUMBER=+1...
+
+# Email
+SMTP_HOST=smtp.example.com
+SMTP_USER=agent@example.com
+SMTP_PASS=...
+```
diff --git a/packages/toolpack-agents/docs/human-in-the-loop.md b/packages/toolpack-agents/docs/human-in-the-loop.md
new file mode 100644
index 0000000..c21bd5e
--- /dev/null
+++ b/packages/toolpack-agents/docs/human-in-the-loop.md
@@ -0,0 +1,292 @@
+# Human-in-the-Loop — ask() and Pending Asks
+
+The `ask()` pattern lets an agent pause mid-execution, send a question to a human over a channel, and resume when the human replies. This is useful for confirmation steps, clarification requests, or approval gates.
+
+## Contents
+
+- [How it works](#how-it-works)
+- [ask()](#ask)
+- [PendingAsk shape](#pendingask-shape)
+- [getPendingAsk()](#getpendingask)
+- [handlePendingAsk()](#handlependingask)
+- [evaluateAnswer()](#evaluateanswer)
+- [resolvePendingAsk()](#resolvependingask)
+- [Constraints](#constraints)
+- [Full example](#full-example)
+
+---
+
+## How it works
+
+```
+User message arrives
+        │
+        ▼
+  invokeAgent()
+        │
+        ├─ check for pending ask ─────────────────────────────┐
+        │  (no pending ask)                                    │
+        │                                              (pending ask exists)
+        ▼                                                      │
+  do some work...                                             ▼
+        │                                          handlePendingAsk()
+        ▼                                                      │
+  this.ask('What is your order number?')           ├─ evaluateAnswer()
+        │                                          │          │
+        ▼                                          │   (sufficient)
+  registry.addPendingAsk(...)                      │          │
+  this.sendTo(channelName, question)               │          ▼
+        │                                          │  continue with answer
+        ▼                                          │
+  returns { metadata: { waitingForHuman: true } }  │   (insufficient + retries left)
+                                                   │          │
+                                                   │          ▼
+Human replies (new message in same conversation)   │  ask again with clarification
+        │                                          │
+        ▼                                (retries exhausted)
+  invokeAgent()                                    │
+        │                                          ▼
+        ├─ getPendingAsk() ─────────────► skip step with message
+        │  (pending ask found)
+        ▼
+  handlePendingAsk(pending, reply, onSufficient)
+```
+
+---
+
+## ask()
+
+`ask()` is a protected method on `BaseAgent`. It:
+
+1. Creates a `PendingAsk` record in the registry.
+2. Sends the question to the triggering channel via `this.sendTo()`.
+3. Returns immediately with `{ metadata: { waitingForHuman: true, askId } }`.
+
+The agent is **not** suspended in a literal async sense — execution continues and the current invocation returns. When the human replies, it arrives as a new message to `invokeAgent()`.
+
+```typescript
+protected async ask(
+  question: string,
+  options?: {
+    context?: Record<string, unknown>;    // developer state to persist alongside the ask
+    maxRetries?: number;                  // max re-ask attempts (default: 2)
+    expiresIn?: number;                   // ms until ask expires (default: never)
+  },
+): Promise<AgentResult>
+```
+
+```typescript
+// Inside invokeAgent():
+const result = await this.ask('What is your order number?', {
+  context: { intent: 'refund', productId: '123' },
+  maxRetries: 2,
+  expiresIn: 10 * 60 * 1000,  // 10 minutes
+});
+// result.metadata.waitingForHuman === true
+return result;
+```
+
+---
+
+## PendingAsk shape
+
+```typescript
+interface PendingAsk {
+  id: string;                         // UUID
+  conversationId: string;             // ties ask to the thread
+  agentName: string;                  // agent that created the ask
+  question: string;                   // the question sent to the human
+  context: Record<string, unknown>;   // developer-stored state
+  status: 'pending' | 'answered' | 'expired';
+  answer?: string;                    // human's answer (when answered)
+  retries: number;                    // current retry count
+  maxRetries: number;
+  askedAt: Date;
+  expiresAt?: Date;
+  channelName: string;                // channel for sending follow-up questions
+}
+```
+
+---
+
+## getPendingAsk()
+
+Check whether a conversation has an outstanding ask. Call this at the **start** of `invokeAgent()` to detect incoming replies.
+
+```typescript
+protected getPendingAsk(conversationId?: string): PendingAsk | null
+```
+
+```typescript
+async invokeAgent(input: AgentInput): Promise<AgentResult> {
+  // Check for pending ask first
+  const pending = this.getPendingAsk(input.conversationId);
+  if (pending && input.message) {
+    return this.handlePendingAsk(
+      pending,
+      input.message,
+      (answer) => this.processWithAnswer(answer, pending.context),
+    );
+  }
+
+  // Normal flow
+  return this.run(input.message ?? '');
+}
+```
+
+---
+
+## handlePendingAsk()
+
+`handlePendingAsk()` handles the complete retry/resolution lifecycle for a pending ask.
+
+```typescript
+protected async handlePendingAsk(
+  pending: PendingAsk,
+  reply: string,
+  onSufficient: (answer: string) => Promise<AgentResult> | AgentResult,
+  onInsufficient?: () => Promise<AgentResult> | AgentResult,
+): Promise<AgentResult>
+```
+
+**What it does:**
+
+1. Calls `evaluateAnswer(pending.question, reply)` to check if the reply is sufficient.
+2. **Sufficient** — calls `resolvePendingAsk(pending.id, reply)` and then calls `onSufficient(reply)`.
+3. **Insufficient, retries left** — increments retry count, calls `ask()` again with a clarification prompt.
+4. **Insufficient, retries exhausted** — resolves with `'__insufficient__'`, sends "skipping" message, calls `onInsufficient()` if provided; otherwise returns `{ output: 'Step skipped due to insufficient input.' }`.
+
+```typescript
+return this.handlePendingAsk(
+  pending,
+  input.message!,
+  async (answer) => {
+    // Happy path — process the confirmed order number
+    const order = await this.lookupOrder(answer);
+    return { output: `Order ${answer} found: ${order.status}` };
+  },
+  async () => {
+    // Give up gracefully
+    return { output: 'Unable to process without an order number. Please start over.' };
+  },
+);
+```
+
+---
+
+## evaluateAnswer()
+
+Validates whether a reply sufficiently addresses a question. Used internally by `handlePendingAsk()`.
+
+```typescript
+protected async evaluateAnswer(
+  question: string,
+  answer: string,
+  options?: {
+    simpleValidation?: (answer: string) => boolean;
+  },
+): Promise<boolean>
+```
+
+- If `simpleValidation` is provided, uses it directly (no LLM call).
+- Otherwise, uses `this.run()` to ask the LLM: `"Is this answer sufficient? Reply ONLY 'yes' or 'no'."`.
+
+For most cases, `simpleValidation` is preferable to avoid the overhead of an extra LLM call:
+
+```typescript
+await this.evaluateAnswer('What is your order number?', reply, {
+  simpleValidation: (a) => /^\d{5,10}$/.test(a.trim()),
+});
+```
+
+---
+
+## resolvePendingAsk()
+
+Mark a pending ask as answered with the human's reply.
+
+```typescript
+protected async resolvePendingAsk(id: string, answer: string): Promise<void>
+```
+
+Call this when you decide to accept the answer (even if not using `handlePendingAsk`):
+
+```typescript
+await this.resolvePendingAsk(pending.id, reply);
+```
+
+---
+
+## Constraints
+
+**Cannot use `ask()` from trigger channels**
+
+`ScheduledChannel` and `EmailChannel` have `isTriggerChannel = true`. Calling `ask()` inside a scheduled trigger throws:
+
+```
+AgentError: this.ask() called from a trigger channel (ScheduledChannel).
+Trigger channels have no human recipient.
+```
+
+**Requires AgentRegistry**
+
+`ask()` uses `this._registry` to store the pending ask and `this._triggeringChannel` to route the question. Both are set by `AgentRegistry.start()`. Calling `ask()` on a standalone agent (not in a registry) throws:
+
+```
+AgentError: Agent not registered - cannot use ask()
+```
+
+**Conversation ID required**
+
+`ask()` requires a `conversationId` so it can route the human's reply back to the correct pending ask. Messages without a `conversationId` are rejected before reaching `invokeAgent()`.
+
+---
+
+## Full example
+
+```typescript
+type SupportIntent = 'refund' | 'general';
+
+class SupportAgent extends BaseAgent<SupportIntent> {
+  name = 'support-agent';
+  description = 'Customer support with confirmation flow';
+  mode = 'chat';
+  systemPrompt = 'You are a helpful customer support agent.';
+
+  async invokeAgent(input: AgentInput<SupportIntent>): Promise<AgentResult> {
+    // 1. Handle replies to pending asks
+    const pending = this.getPendingAsk(input.conversationId);
+    if (pending && input.message) {
+      return this.handlePendingAsk(
+        pending,
+        input.message,
+        async (orderNumber) => {
+          const refundResult = await this.processRefund(orderNumber, pending.context);
+          return { output: `Refund for order ${orderNumber} has been processed: ${refundResult}` };
+        },
+        async () => ({
+          output: 'Unable to process the refund without a valid order number.',
+        }),
+      );
+    }
+
+    // 2. Route by intent
+    if (input.intent === 'refund') {
+      // Ask for confirmation before proceeding
+      return this.ask('Please provide your order number to process the refund.', {
+        context: { intent: 'refund', userId: input.participant?.id },
+        maxRetries: 3,
+        expiresIn: 15 * 60 * 1000,  // 15 minutes
+      });
+    }
+
+    // 3. General queries
+    return this.run(input.message ?? '');
+  }
+
+  private async processRefund(orderNumber: string, context: Record<string, unknown>): Promise<string> {
+    // ... refund logic
+    return 'approved';
+  }
+}
+```
diff --git a/packages/toolpack-agents/docs/interceptors.md b/packages/toolpack-agents/docs/interceptors.md
new file mode 100644
index 0000000..960c599
--- /dev/null
+++ b/packages/toolpack-agents/docs/interceptors.md
@@ -0,0 +1,541 @@
+# Interceptors — Composable Middleware
+
+Interceptors are middleware functions that run before `invokeAgent()` is called. They can modify the input, skip processing entirely, delegate to another agent, or short-circuit with a response. The system is inspired by Koa-style middleware with a `next()` function.
+
+## Contents
+
+- [Interceptor type](#interceptor-type)
+- [InterceptorContext](#interceptorcontext)
+- [SKIP_SENTINEL](#skip_sentinel)
+- [Composing and executing chains](#composing-and-executing-chains)
+- [Automatic capture interceptor](#automatic-capture-interceptor)
+- [Built-in interceptors](#built-in-interceptors)
+  - [createEventDedupInterceptor](#createeventdedupinterceptor)
+  - [createNoiseFilterInterceptor](#createnoisefilterinterceptor)
+  - [createSelfFilterInterceptor](#createselffilterinterceptor)
+  - [createRateLimitInterceptor](#createratelimitinterceptor)
+  - [createParticipantResolverInterceptor](#createparticipantresolverinterceptor)
+  - [createCaptureInterceptor](#createcaptureinterceptor)
+  - [createAddressCheckInterceptor](#createaddresscheckinterceptor)
+  - [createIntentClassifierInterceptor](#createintentclassifierinterceptor)
+  - [createDepthGuardInterceptor](#createdepthguardinterceptor)
+  - [createTracerInterceptor](#createtracerinterceptor)
+- [Writing a custom interceptor](#writing-a-custom-interceptor)
+
+---
+
+## Interceptor type
+
+```typescript
+type Interceptor = (
+  input: AgentInput,
+  ctx: InterceptorContext,
+  next: NextFunction,
+) => Promise<InterceptorResult>;
+
+type NextFunction = (input?: AgentInput) => Promise<InterceptorResult>;
+type InterceptorResult = AgentResult | typeof SKIP_SENTINEL;
+```
+
+An interceptor either:
+- **Calls `next(input?)`** to pass control to the next interceptor (or ultimately `invokeAgent`).
+- **Returns `ctx.skip()`** (`SKIP_SENTINEL`) to drop the message entirely — no response sent.
+- **Returns an `AgentResult`** directly to short-circuit `invokeAgent` and send that result as the response.
+
+---
+
+## InterceptorContext
+
+```typescript
+interface InterceptorContext {
+  agent: AgentInstance;
+  channel: ChannelInterface;
+  registry: IAgentRegistry | null;
+  invocationDepth: number;
+
+  // Delegate to another agent and wait for result
+  delegateAndWait(agentName: string, input: Partial<AgentInput>): Promise<AgentResult>;
+
+  // Return this to skip processing
+  skip(): typeof SKIP_SENTINEL;
+
+  // Structured logger (provided by chain infrastructure, not always present)
+  logger?: {
+    debug(msg: string, meta?: Record<string, unknown>): void;
+    info(msg: string, meta?: Record<string, unknown>): void;
+    warn(msg: string, meta?: Record<string, unknown>): void;
+    error(msg: string, meta?: Record<string, unknown>): void;
+  };
+}
+```
+
+---
+
+## SKIP_SENTINEL
+
+`SKIP_SENTINEL` is a unique symbol. When an interceptor returns it, the framework:
+1. Does not call `invokeAgent()`.
+2. Does not send anything to the channel.
+3. The message is silently dropped.
+
+Use it to filter out noise, duplicates, or messages not addressed to this agent.
+
+```typescript
+import { isSkipSentinel, skip } from '@toolpack-sdk/agents';
+
+const myInterceptor: Interceptor = async (input, ctx, next) => {
+  if (shouldIgnore(input)) {
+    return ctx.skip();             // or return skip()
+  }
+  return next(input);
+};
+```
+
+---
+
+## Composing and executing chains
+
+`BaseAgent` handles chain composition internally. If you need to test or invoke a chain manually:
+
+```typescript
+import { composeChain, executeChain } from '@toolpack-sdk/agents';
+
+const chain = composeChain(
+  interceptors,    // Interceptor[]
+  agent,           // AgentInstance
+  channel,         // ChannelInterface
+  registry,        // IAgentRegistry | null
+  { maxInvocationDepth: 5 },
+);
+
+const result = await executeChain(chain, input);
+// result is null when SKIP_SENTINEL, otherwise AgentResult
+```
+
+---
+
+## Automatic capture interceptor
+
+`BaseAgent._getEffectiveInterceptors()` **always prepends** a `createCaptureInterceptor` to the chain, unless one is already present (detected via `CAPTURE_INTERCEPTOR_MARKER`). This means:
+
+- You do **not** need to add `createCaptureInterceptor` manually.
+- Every inbound message and every agent reply is recorded automatically.
+- If you want custom capture behaviour, add your own `createCaptureInterceptor` — the auto-prepend will see the marker and skip adding a second one.
+
+---
+
+## Built-in interceptors
+
+### createEventDedupInterceptor
+
+Drops duplicate events based on an event ID extracted from `input.context?.eventId`. Prevents Slack/Telegram delivery retries from triggering the agent multiple times.
+
+```typescript
+import { createEventDedupInterceptor } from '@toolpack-sdk/agents';
+
+export interface EventDedupConfig {
+  maxCacheSize?: number;                                        // LRU cache size (default: 1000)
+  getEventId?: (input: AgentInput) => string | undefined;      // custom ID extractor
+  onDuplicate?: (eventId: string, input: AgentInput) => void;  // callback on duplicate
+}
+
+agent.interceptors = [
+  createEventDedupInterceptor({
+    maxCacheSize: 500,
+    getEventId: (input) => input.context?.slackEventId as string,
+  }),
+];
+```
+
+The default `getEventId` reads `input.context?.eventId`. If your channel stores the platform event ID elsewhere, supply a custom extractor.
+
+---
+
+### createNoiseFilterInterceptor
+
+Drops messages by subtype. Useful for silently ignoring message edits, deletions, and other noise events.
+
+```typescript
+import { createNoiseFilterInterceptor } from '@toolpack-sdk/agents';
+
+export interface NoiseFilterConfig {
+  denySubtypes: string[];                                       // required — list of subtypes to drop
+  getSubtype?: (input: AgentInput) => string | undefined;      // custom subtype extractor
+  onFiltered?: (subtype: string, input: AgentInput) => void;   // callback when filtered
+}
+
+agent.interceptors = [
+  createNoiseFilterInterceptor({
+    denySubtypes: ['message_changed', 'message_deleted', 'bot_message'],
+  }),
+];
+```
+
+The default `getSubtype` reads `input.context?.subtype`. `denySubtypes` is **required** (no default).
+
+---
+
+### createSelfFilterInterceptor
+
+Prevents the agent from responding to its own messages — stops feedback loops.
+
+```typescript
+import { createSelfFilterInterceptor } from '@toolpack-sdk/agents';
+
+export interface SelfFilterConfig {
+  agentId?: string;                                            // optional, defaults to ctx.agent.name
+  getSenderId: (input: AgentInput) => string | undefined;     // required — extract sender ID
+  onSelfMessage?: (senderId: string, input: AgentInput) => void;
+}
+
+agent.interceptors = [
+  createSelfFilterInterceptor({
+    agentId: 'U123BOT',                                       // Slack botUserId
+    getSenderId: (input) => input.context?.senderId as string,
+  }),
+];
+```
+
+`getSenderId` is **required** — you must tell the interceptor how to extract the sender from your channel's context. `agentId` is optional and defaults to `ctx.agent.name` (the agent's `name` string).
+
+---
+
+### createRateLimitInterceptor
+
+Token-bucket rate limiter per entity. Each key gets its own bucket; `getKey` is **required**.
+
+```typescript
+import { createRateLimitInterceptor } from '@toolpack-sdk/agents';
+
+export interface RateLimitConfig {
+  getKey: (input: AgentInput) => string;      // required — bucket key (e.g. user ID)
+  tokensPerInterval?: number;                  // bucket refill & capacity (default: 10)
+  interval?: number;                           // refill interval in ms (default: 60000)
+  maxBuckets?: number;                         // LRU cache size (default: 1000)
+  onExceeded?: 'skip' | 'reject';             // 'skip' silently drops; 'reject' throws (default: 'skip')
+  onRateLimited?: (key: string, input: AgentInput) => void;
+}
+
+agent.interceptors = [
+  createRateLimitInterceptor({
+    getKey: (input) => input.participant?.id ?? input.conversationId ?? 'global',
+    tokensPerInterval: 5,   // 5 messages per minute per user
+    interval: 60000,
+  }),
+];
+```
+
+Note: there is no `requestsPerMinute` shorthand — use `tokensPerInterval` + `interval` together.
+
+---
+
+### createParticipantResolverInterceptor
+
+Enriches `input.participant` by calling the channel's `resolveParticipant()` or a custom resolver function.
+
+```typescript
+import { createParticipantResolverInterceptor } from '@toolpack-sdk/agents';
+
+export interface ParticipantResolverConfig {
+  // Optional: explicit resolver; if omitted uses channel.resolveParticipant()
+  resolveParticipant?: (input: AgentInput) => Participant | undefined | Promise<Participant | undefined>;
+  // Called after successful resolution (for logging/metrics)
+  onResolved?: (input: AgentInput, participant: Participant) => void;
+}
+
+agent.interceptors = [
+  createParticipantResolverInterceptor(),                           // auto-uses channel.resolveParticipant()
+
+  // or with a custom resolver:
+  createParticipantResolverInterceptor({
+    resolveParticipant: async (input) => ({
+      kind: 'user',
+      id: input.context?.userId as string,
+      displayName: await fetchDisplayName(input.context?.userId as string),
+    }),
+  }),
+];
+```
+
+Resolution order: (1) `config.resolveParticipant` if provided, (2) `ctx.channel.resolveParticipant()` if the channel implements it, (3) whatever `channel.normalize()` already placed on `input.participant`. Failures in the resolver are non-fatal — the pipeline continues unchanged.
+
+---
+
+### createCaptureInterceptor
+
+Records inbound messages and outbound replies to the `ConversationStore`. **Auto-prepended** by `BaseAgent` — you rarely need to add this manually.
+
+```typescript
+import { createCaptureInterceptor } from '@toolpack-sdk/agents';
+
+export interface CaptureHistoryConfig {
+  store: ConversationStore;                                  // required
+  getScope?: (input: AgentInput) => ConversationScope;      // default: infers from context.channelType / context.threadId
+  getMessageId?: (input: AgentInput) => string;             // default: context.messageId ?? context.eventId ?? randomUUID()
+  getMentions?: (input: AgentInput) => string[];            // default: context.mentions ?? []
+  onCaptured?: (message: StoredMessage) => void;            // callback after write
+  captureAgentReplies?: boolean;                            // also write agent replies (default: true)
+}
+
+// Manual usage (usually not needed):
+agent.interceptors = [
+  createCaptureInterceptor({
+    store: agent.conversationHistory,
+    getScope: (input) => input.context?.channelType === 'im' ? 'dm' : 'channel',
+  }),
+];
+```
+
+The interceptor writes the inbound message **before** calling `next()`, and writes the agent's reply **after** `next()` returns. Both writes are non-fatal. Marked with `CAPTURE_INTERCEPTOR_MARKER` to prevent double-registration.
+
+**Default scope inference**: reads `input.context?.channelType` — `'im'`/`'private'`/`'dm'` → `'dm'`; presence of `context.threadId` → `'thread'`; otherwise → `'channel'`.
+
+---
+
+### createAddressCheckInterceptor
+
+Classifies whether a message is addressed to this agent using heuristic pattern matching. **Important**: this interceptor enriches the input and always calls `next()`. It does NOT skip on its own — it stores the classification in `input.context._addressCheck` for the `createIntentClassifierInterceptor` to act on.
+
+```typescript
+import { createAddressCheckInterceptor } from '@toolpack-sdk/agents';
+
+export type AddressCheckResult = 'direct' | 'indirect' | 'passive' | 'ignore' | 'ambiguous';
+
+export interface AddressCheckConfig {
+  agentName: string;                                          // required — agent's display name
+  agentId?: string;                                           // optional — platform user/bot ID
+  getMessageText: (input: AgentInput) => string | undefined; // required — extract message text
+  isDirectMessage?: (input: AgentInput) => boolean;          // DMs are always classified 'direct'
+  getMentions?: (input: AgentInput) => string[];             // extract @mention IDs
+  onClassified?: (result: AddressCheckResult, input: AgentInput) => void;
+}
+
+agent.interceptors = [
+  createAddressCheckInterceptor({
+    agentName: 'support-agent',
+    agentId: 'U123BOT',
+    getMessageText: (input) => input.message ?? '',
+    isDirectMessage: (input) => input.context?.channelType === 'im',
+    getMentions: (input) => input.context?.mentions as string[] ?? [],
+  }),
+];
+```
+
+### Classification heuristics
+
+| Rule checked | Classification |
+|---|---|
+| `isDirectMessage(input)` returns true | `'direct'` |
+| Message starts with `@agentName` or `@agentId` | `'direct'` |
+| Message contains `the/my/our agentName` pattern | `'ambiguous'` |
+| Agent name appears only inside code blocks | `'ignore'` |
+| Message is a bare URL | `'ignore'` |
+| Agent is mentioned alongside other agents | `'indirect'` |
+| Agent name is mentioned somewhere | `'ambiguous'` |
+| No agent mention found | `'passive'` |
+
+The classification is written to `input.context._addressCheck`. Pair with `createIntentClassifierInterceptor` (see next) to act on it.
+
+---
+
+### createIntentClassifierInterceptor
+
+Reads the `_addressCheck` classification set by `createAddressCheckInterceptor` and decides whether to skip or proceed. For `'ambiguous'` and `'indirect'` cases it delegates to an `IntentClassifierAgent` for LLM-based disambiguation.
+
+```typescript
+import { createIntentClassifierInterceptor } from '@toolpack-sdk/agents';
+
+export interface IntentClassifierInterceptorConfig {
+  agentName: string;                                           // required
+  agentId: string;                                             // required
+  getMessageText: (input: AgentInput) => string | undefined;  // required
+  getSenderName: (input: AgentInput) => string;               // required
+  getChannelName: (input: AgentInput) => string;              // required
+  classifierAgentName?: string;                               // default: 'intent-classifier'
+  isDirectMessage?: (input: AgentInput) => boolean;
+  getRecentContext?: (input: AgentInput) => Array<{ sender: string; content: string }>;
+  onClassified?: (classification: IntentClassification, input: AgentInput) => void;
+}
+
+agent.interceptors = [
+  // Must come first — writes _addressCheck to context
+  createAddressCheckInterceptor({
+    agentName: 'support-agent',
+    agentId: 'U123BOT',
+    getMessageText: (input) => input.message ?? '',
+  }),
+  // Reads _addressCheck; skips passive/ignore; calls LLM for ambiguous/indirect
+  createIntentClassifierInterceptor({
+    agentName: 'support-agent',
+    agentId: 'U123BOT',
+    getMessageText: (input) => input.message ?? '',
+    getSenderName: (input) => input.participant?.displayName ?? 'Unknown',
+    getChannelName: (input) => input.context?.channelName as string ?? 'general',
+  }),
+];
+```
+
+### Behaviour table
+
+| `_addressCheck` value | Action |
+|---|---|
+| `'direct'` | Proceed immediately (no LLM call) |
+| `'ignore'` | Skip |
+| `'passive'` | Skip |
+| `'ambiguous'` | Call `IntentClassifierAgent` → proceed if `'direct'`, skip otherwise |
+| `'indirect'` | Call `IntentClassifierAgent` → proceed if `'direct'`, skip otherwise |
+| *(not set / no prior address-check)* | Call `IntentClassifierAgent` |
+
+If the classifier call fails, the interceptor falls back to allowing the message.
+
+---
+
+### createDepthGuardInterceptor
+
+Prevents runaway recursion in agent delegation chains.
+
+```typescript
+import { createDepthGuardInterceptor } from '@toolpack-sdk/agents';
+
+export interface DepthGuardConfig {
+  maxDepth?: number;                                                                   // default: 5
+  onDepthExceeded?: (currentDepth: number, maxDepth: number, input: AgentInput) => void;
+}
+
+agent.interceptors = [
+  createDepthGuardInterceptor({ maxDepth: 5 }),
+];
+```
+
+When `invocationDepth > maxDepth`, throws `DepthExceededError`. The actual depth protection primarily lives inside the chain composer's `delegateAndWait` — this interceptor is belt-and-suspenders for future scenarios where delegated calls route through the full interceptor chain.
+
+---
+
+### createTracerInterceptor
+
+Structured logging of each chain hop for debugging. Uses `ctx.logger` (from chain context) — no custom logger config.
+
+```typescript
+import { createTracerInterceptor } from '@toolpack-sdk/agents';
+
+export interface TracerConfig {
+  level?: 'debug' | 'info';              // log level (default: 'debug')
+  includeInputData?: boolean;            // log full input (default: false)
+  includeResultOutput?: boolean;         // log full result (default: false)
+  shouldTrace?: (input: AgentInput) => boolean;  // filter which inputs to trace
+}
+
+agent.interceptors = [
+  createTracerInterceptor({
+    level: 'debug',
+    includeInputData: true,
+  }),
+];
+```
+
+Logs entry (before `next()`) and exit (after `next()`) with agent name, channel, depth, conversationId, and duration. To see these logs, wire a logger into the chain context via `composeChain` options.
+
+---
+
+## Writing a custom interceptor
+
+An interceptor is any async function matching the `Interceptor` type:
+
+```typescript
+import type { Interceptor } from '@toolpack-sdk/agents';
+
+const auditInterceptor: Interceptor = async (input, ctx, next) => {
+  const start = Date.now();
+
+  auditLog.write({ event: 'message_received', conversationId: input.conversationId });
+
+  const result = await next(input);
+
+  if (result !== null) {
+    auditLog.write({ event: 'message_handled', duration: Date.now() - start });
+  }
+
+  return result;
+};
+
+agent.interceptors = [auditInterceptor];
+```
+
+### Modifying the input
+
+Pass a modified `AgentInput` to `next()` to transform it before reaching `invokeAgent`:
+
+```typescript
+const enrichmentInterceptor: Interceptor = async (input, ctx, next) => {
+  const enriched: AgentInput = {
+    ...input,
+    context: {
+      ...input.context,
+      userTier: await lookupUserTier(input.participant?.id),
+    },
+  };
+  return next(enriched);
+};
+```
+
+### Short-circuiting
+
+Return an `AgentResult` directly to bypass `invokeAgent` entirely:
+
+```typescript
+const maintenanceModeInterceptor: Interceptor = async (input, ctx, next) => {
+  if (maintenanceMode.isActive()) {
+    return {
+      output: 'The service is currently undergoing maintenance. Please try again later.',
+      metadata: { maintenance: true },
+    };
+  }
+  return next(input);
+};
+```
+
+### Recommended interceptor order
+
+```typescript
+agent.interceptors = [
+  // 1. Noise/dedup first — cheapest filters, drop junk early
+  createEventDedupInterceptor(),
+  createNoiseFilterInterceptor({ denySubtypes: ['message_changed', 'message_deleted'] }),
+  createSelfFilterInterceptor({
+    agentId: 'U123BOT',
+    getSenderId: (input) => input.context?.userId as string,
+  }),
+
+  // 2. Rate limiting
+  createRateLimitInterceptor({
+    getKey: (input) => input.participant?.id ?? 'global',
+    tokensPerInterval: 20,
+    interval: 60000,
+  }),
+
+  // 3. Enrichment
+  createParticipantResolverInterceptor(),
+
+  // 4. Address check (pattern matching — cheap)
+  createAddressCheckInterceptor({
+    agentName: agent.name,
+    getMessageText: (input) => input.message ?? '',
+  }),
+
+  // 5. Intent classification (LLM call only for ambiguous cases)
+  createIntentClassifierInterceptor({
+    agentName: agent.name,
+    agentId: agent.name,
+    getMessageText: (input) => input.message ?? '',
+    getSenderName: (input) => input.participant?.displayName ?? 'Unknown',
+    getChannelName: (input) => input.context?.channelName as string ?? 'general',
+  }),
+
+  // 6. Safety guard
+  createDepthGuardInterceptor(),
+
+  // 7. Debug (development only)
+  // createTracerInterceptor({ level: 'debug' }),
+];
+// Note: createCaptureInterceptor is auto-prepended before all of these
+```
diff --git a/packages/toolpack-agents/docs/registry.md b/packages/toolpack-agents/docs/registry.md
new file mode 100644
index 0000000..90fa71e
--- /dev/null
+++ b/packages/toolpack-agents/docs/registry.md
@@ -0,0 +1,202 @@
+# AgentRegistry — Multi-Agent Coordination
+
+`AgentRegistry` is the optional coordinator for multi-agent deployments. It wires agents together, manages the channel routing table, and provides the shared transport layer for cross-agent delegation.
+
+**You do not need `AgentRegistry` for a single-agent deployment** — just call `agent.start()` directly.
+
+## Contents
+
+- [When to use AgentRegistry](#when-to-use-agentregistry)
+- [Construction](#construction)
+- [start() and stop()](#start-and-stop)
+- [Channel routing](#channel-routing)
+- [Agent lookup](#agent-lookup)
+- [Invoking agents programmatically](#invoking-agents-programmatically)
+- [Pending asks store](#pending-asks-store)
+- [Custom transport](#custom-transport)
+- [What start() does internally](#what-start-does-internally)
+
+---
+
+## When to use AgentRegistry
+
+Use `AgentRegistry` when:
+
+- You have multiple agents that need to delegate tasks to each other
+- You need `sendTo()` across agents — routing output to a channel owned by a different agent
+- You want centralised `ask()` / pending-ask resolution
+- You want a single `start()` / `stop()` call that manages all agents
+
+---
+
+## Construction
+
+```typescript
+import { AgentRegistry } from '@toolpack-sdk/agents';
+
+const registry = new AgentRegistry(
+  [agentA, agentB, agentC],   // array of BaseAgent instances
+  {
+    transport: customTransport, // optional: override LocalTransport
+  },
+);
+```
+
+Each agent already has its own `channels` and `interceptors` configured. The registry does not own those — it just coordinates lifecycle and routing.
+
+---
+
+## start() and stop()
+
+```typescript
+await registry.start();
+
+// ... your application runs ...
+
+// Graceful shutdown — stops all channels and releases Toolpack instances
+// (Not yet implemented as a single method on registry; call agent.stop() per agent)
+for (const agent of registry.getAllAgents()) {
+  await (agent as BaseAgent).stop();
+}
+```
+
+`registry.start()` performs these steps for each agent in order:
+
+1. **Initialise Toolpack** — calls `agent._ensureToolpack()` so the API client is ready before channels start.
+2. **Wire registry reference** — sets `agent._registry = this` so `sendTo()`, `ask()`, and `delegate()` work.
+3. **Register named channels** — scans each agent's `channels` array and adds named channels to the routing table for `sendTo()`.
+4. **Start agent** — calls `agent.start()` which binds message handlers to each channel and calls `channel.listen()`.
+
+---
+
+## Channel routing
+
+Any channel with a `name` property is registered in the routing table and can be targeted by `sendTo()`:
+
+```typescript
+// SlackChannel named 'alerts'
+const slackAlerts = new SlackChannel({
+  name: 'alerts',                          // ← this name is registered
+  token: process.env.SLACK_BOT_TOKEN!,
+  signingSecret: process.env.SLACK_SIGNING_SECRET!,
+  channel: '#alerts',
+});
+
+// From inside any agent in the registry
+await this.sendTo('alerts', 'Deployment completed successfully');
+```
+
+`sendTo()` on `AgentRegistry` directly:
+
+```typescript
+await registry.sendTo('alerts', { output: 'Server is down', metadata: { severity: 'critical' } });
+```
+
+If no channel with that name is registered, `sendTo()` throws.
+
+---
+
+## Agent lookup
+
+```typescript
+// Get a specific agent
+const agent = registry.getAgent('research-agent');
+
+// Get all agents
+const allAgents = registry.getAllAgents();
+
+// Get a channel by name
+const channel = registry.getChannel('alerts');
+```
+
+---
+
+## Invoking agents programmatically
+
+`registry.invoke()` calls an agent's `invokeAgent()` through the transport layer. Used internally by `agent.delegateAndWait()`.
+
+```typescript
+const result = await registry.invoke('research-agent', {
+  message: 'What is the latest on TSMC?',
+  conversationId: 'conv-123',
+});
+
+console.log(result.output);
+```
+
+---
+
+## Pending asks store
+
+The registry holds an in-memory store for human-in-the-loop questions (`PendingAsk`). Agents interact with this through `ask()`, `getPendingAsk()`, `handlePendingAsk()` — see [human-in-the-loop.md](human-in-the-loop.md).
+
+Direct registry methods (primarily used internally):
+
+```typescript
+// Add a pending ask
+const ask = registry.addPendingAsk({
+  conversationId: 'conv-123',
+  agentName: 'support-agent',
+  question: 'Can you confirm your order number?',
+  context: {},
+  maxRetries: 2,
+  channelName: 'support-slack',
+});
+
+// Check for pending asks
+const hasPending = registry.hasPendingAsks('conv-123');
+
+// Resolve with answer
+await registry.resolvePendingAsk(ask.id, '12345');
+
+// Get pending ask for conversation
+const pending = registry.getPendingAsk('conv-123');
+
+// Increment retries
+const newCount = registry.incrementRetries(ask.id);
+
+// Clean up expired asks (call periodically)
+const cleaned = registry.cleanupExpiredAsks();
+```
+
+---
+
+## Custom transport
+
+By default the registry uses `LocalTransport` which routes delegation calls in-process. Override with `JsonRpcTransport` for cross-process or network deployments:
+
+```typescript
+import { AgentRegistry, JsonRpcTransport } from '@toolpack-sdk/agents';
+
+const registry = new AgentRegistry([agent], {
+  transport: new JsonRpcTransport({ endpoint: 'http://agent-server:8080' }),
+});
+```
+
+See [transport.md](transport.md) for details.
+
+---
+
+## What start() does internally
+
+Sequence diagram for `registry.start()`:
+
+```
+registry.start()
+  │
+  ├─ for each agent:
+  │    ├─ agent._ensureToolpack()       // init Toolpack client
+  │    ├─ agent._registry = registry   // wire cross-agent features
+  │    ├─ instances.set(agent.name, agent)
+  │    └─ for each channel with name:
+  │         channels.set(channel.name, channel)
+  │
+  └─ for each agent:
+       └─ agent.start()
+            ├─ for each channel:
+            │    ├─ _bindChannel(channel)   // attach interceptor chain
+            │    └─ channel.listen()        // begin accepting messages
+            └─ ...
+```
+
+The two-pass loop (first wire all registries, then start all agents) ensures that when `agent.start()` triggers the first message, all peer agents and channels are already registered and discoverable via `sendTo()`.
diff --git a/packages/toolpack-agents/docs/testing.md b/packages/toolpack-agents/docs/testing.md
new file mode 100644
index 0000000..8850a73
--- /dev/null
+++ b/packages/toolpack-agents/docs/testing.md
@@ -0,0 +1,470 @@
+# Testing Agents
+
+`@toolpack-sdk/agents` ships testing utilities that let you unit-test agents in complete isolation — no API keys, no live channels, no network calls.
+
+## Import path
+
+```typescript
+import { createTestAgent, MockChannel, captureEvents, createMockKnowledge } from '@toolpack-sdk/agents/testing';
+```
+
+The testing utilities live in the `./testing` sub-path export, not in the main package root.
+
+## Contents
+
+- [createTestAgent()](#createtestagent)
+- [MockChannel](#mockchannel)
+- [MockResponse matching](#mockresponse-matching)
+- [captureEvents()](#captureevents)
+- [createMockKnowledge()](#createmockknowledge)
+- [Testing patterns](#testing-patterns)
+
+---
+
+## createTestAgent()
+
+The primary testing factory. Creates an agent instance wired to a `MockChannel` and a mock Toolpack that returns scripted responses.
+
+```typescript
+import { createTestAgent } from '@toolpack-sdk/agents/testing';
+
+function createTestAgent<TAgent extends BaseAgent>(
+  AgentClass: new (options: BaseAgentOptions) => TAgent,
+  options?: CreateTestAgentOptions,
+): TestAgentResult<TAgent>
+```
+
+### Options
+
+```typescript
+interface CreateTestAgentOptions {
+  mockResponses?: MockResponse[];      // scripted LLM responses
+  defaultResponse?: string;            // fallback when no trigger matches (default: 'Mock AI response')
+  provider?: string;                   // mock provider name
+  model?: string;                      // mock model name
+}
+
+interface MockResponse {
+  trigger: string | RegExp;            // matched against user message
+  response: string;                    // what the mock LLM returns
+  usage?: {
+    prompt_tokens: number;
+    completion_tokens: number;
+    total_tokens: number;
+  };
+}
+```
+
+### Return value
+
+```typescript
+interface TestAgentResult<TAgent extends BaseAgent> {
+  agent: TAgent;                                           // the agent instance
+  channel: MockChannel;                                    // mock channel wired to the agent
+  toolpack: Toolpack;                                      // mock toolpack instance
+  addMockResponse: (response: MockResponse) => void;       // add responses after creation
+}
+```
+
+### Example
+
+```typescript
+import { describe, it, expect } from 'vitest';
+import { createTestAgent } from '@toolpack-sdk/agents/testing';
+import { SupportAgent } from './support-agent.js';
+
+describe('SupportAgent', () => {
+  it('handles a refund request', async () => {
+    const { agent, channel } = createTestAgent(SupportAgent, {
+      mockResponses: [
+        { trigger: 'refund', response: 'Your refund has been approved.' },
+      ],
+    });
+
+    const result = await agent.invokeAgent({
+      message: 'I need a refund for order #12345',
+      conversationId: 'test-conv-1',
+      participant: { kind: 'user', id: 'user-1', displayName: 'Alice' },
+    });
+
+    expect(result.output).toBe('Your refund has been approved.');
+  });
+
+  it('returns default response for unmatched messages', async () => {
+    const { agent } = createTestAgent(SupportAgent, {
+      defaultResponse: 'How can I help you today?',
+    });
+
+    const result = await agent.invokeAgent({
+      message: 'Hello',
+      conversationId: 'test-conv-2',
+    });
+
+    expect(result.output).toBe('How can I help you today?');
+  });
+});
+```
+
+---
+
+## MockChannel
+
+`MockChannel` implements `ChannelInterface` and records all inputs and outputs. Wired automatically by `createTestAgent`, but can also be used standalone.
+
+```typescript
+import { MockChannel } from '@toolpack-sdk/agents/testing';
+
+const channel = new MockChannel();
+```
+
+### Properties
+
+```typescript
+class MockChannel implements ChannelInterface {
+  name = 'mock-channel';
+  isTriggerChannel = false;
+
+  // Inspection
+  get inputs(): AgentInput[];              // normalized messages received (inbound)
+  get outputs(): AgentOutput[];            // messages sent (outbound)
+  get lastInput(): AgentInput | undefined;
+  get lastOutput(): AgentOutput | undefined;
+  get receivedCount(): number;
+  get sentCount(): number;
+  get isListening(): boolean;
+
+  // Simulation
+  async receive(incoming: unknown): Promise<void>;       // normalize + invoke handler
+  async receiveMessage(
+    message: string,
+    conversationId?: string,
+    intent?: string,
+    context?: Record<string, unknown>,
+  ): Promise<void>;
+  async send(output: AgentOutput): Promise<void>;        // record outbound message
+  clear(): void;                                          // reset captured inputs/outputs
+
+  // Assertion helpers
+  assertOutputContains(text: string): void;
+  assertLastOutput(expected: string): void;
+
+  // ChannelInterface compliance
+  listen(): void;
+  stop(): void;
+  normalize(incoming: unknown): AgentInput;
+  onMessage(handler: (input: AgentInput) => Promise<void>): void;
+}
+```
+
+### Simulating messages
+
+`receive()` accepts `unknown` and runs it through `normalize()` — it does **not** take an `AgentInput` directly. Use `receiveMessage()` for the most common case:
+
+```typescript
+// Simple text message
+await channel.receiveMessage(
+  'What is my account balance?',
+  'conv-abc',              // conversationId (default: 'test-conversation-1')
+  'balance_inquiry',       // intent (optional)
+  { userId: 'user-42' },  // context (optional)
+);
+
+expect(channel.lastOutput?.output).toContain('balance');
+expect(channel.sentCount).toBe(1);
+```
+
+Or use `receive()` with a raw object (normalized via `normalize()`):
+
+```typescript
+await channel.receive({
+  message: 'Check order #789',
+  conversationId: 'conv-1',
+  intent: 'order_lookup',
+});
+```
+
+### Full channel-driven test
+
+```typescript
+it('processes message through full interceptor chain', async () => {
+  const { agent, channel } = createTestAgent(MyAgent, {
+    mockResponses: [{ trigger: /order/i, response: 'Order found.' }],
+  });
+
+  await agent.start();   // binds channel handlers + interceptor chain
+
+  await channel.receive({ message: 'Check order #789', conversationId: 'conv-1' });
+
+  expect(channel.outputs).toHaveLength(1);
+  expect(channel.lastOutput?.output).toBe('Order found.');
+
+  await agent.stop();
+});
+```
+
+### Built-in assertions
+
+```typescript
+channel.assertOutputContains('approved');   // throws if no output contains this text
+channel.assertLastOutput('Exact match');    // throws if last output !== expected
+```
+
+---
+
+## MockResponse matching
+
+The mock toolpack checks responses in order. First match wins.
+
+- **String trigger**: checks if the user message **contains** the trigger string (case-sensitive).
+- **RegExp trigger**: tests the user message against the regex.
+- **`defaultResponse`**: returned when no trigger matches.
+
+```typescript
+const { agent } = createTestAgent(MyAgent, {
+  mockResponses: [
+    { trigger: /cancel.*order/i, response: 'Order cancellation initiated.' },
+    { trigger: 'cancel', response: 'What would you like to cancel?' },
+    { trigger: /refund/i, response: 'Refund request received.' },
+  ],
+  defaultResponse: 'I can help with that.',
+});
+```
+
+Add responses dynamically:
+
+```typescript
+const { agent, addMockResponse } = createTestAgent(MyAgent);
+addMockResponse({ trigger: 'shipping', response: 'Your package ships in 2 days.' });
+```
+
+---
+
+## captureEvents()
+
+Captures agent lifecycle events emitted during a test run. Returns a rich `EventCapture` object with assertion helpers.
+
+```typescript
+import { captureEvents } from '@toolpack-sdk/agents/testing';
+
+const events = captureEvents(agent);   // no options argument
+
+// ... run agent ...
+
+events.stop();   // detach listeners
+```
+
+### EventCapture API
+
+```typescript
+type AgentEventName = 'agent:start' | 'agent:complete' | 'agent:error';
+// Note: 'agent:step' is NOT an event name — only the three above are captured.
+
+interface CapturedEvent {
+  name: AgentEventName;
+  data: unknown;           // event payload
+  timestamp: number;       // Date.now() value (number, not Date)
+}
+
+interface EventCapture {
+  readonly events: CapturedEvent[];
+  readonly count: number;
+
+  clear(): void;
+  stop(): void;                                               // remove listeners
+
+  hasEvent(name: AgentEventName): boolean;
+  getEvents(name: AgentEventName): CapturedEvent[];
+  getFirstEvent(name: AgentEventName): CapturedEvent | undefined;
+  getLastEvent(name: AgentEventName): CapturedEvent | undefined;
+  assertEvent(name: AgentEventName): void;                    // throws if event not found
+  assertNoEvent(name: AgentEventName): void;                  // throws if event was found
+}
+```
+
+### Example
+
+```typescript
+it('emits start and complete events', async () => {
+  const { agent } = createTestAgent(MyAgent, { defaultResponse: 'Done.' });
+  const events = captureEvents(agent);
+
+  await agent.invokeAgent({ message: 'Hello', conversationId: 'c1' });
+
+  events.assertEvent('agent:start');
+  events.assertEvent('agent:complete');
+  events.assertNoEvent('agent:error');
+
+  events.stop();
+});
+```
+
+### Custom Vitest/Jest matchers
+
+```typescript
+import { registerEventMatchers } from '@toolpack-sdk/agents/testing';
+import { expect } from 'vitest';
+
+// In your test setup file:
+registerEventMatchers(expect);
+
+// Then in tests:
+expect(events).toContainEvent('agent:start');
+expect(events).not.toContainEvent('agent:error');
+expect(events).toContainEventTimes('agent:complete', 1);
+```
+
+---
+
+## createMockKnowledge()
+
+Provides an in-memory `Knowledge` instance pre-populated with test data. Useful for testing agents that query a knowledge base without needing a real embedder or vector store.
+
+```typescript
+import { createMockKnowledge, createMockKnowledgeSync } from '@toolpack-sdk/agents/testing';
+```
+
+### createMockKnowledge (async)
+
+Returns a real `Knowledge` instance from `@toolpack-sdk/knowledge` backed by a `MemoryProvider` and a deterministic mock embedder.
+
+```typescript
+interface MockKnowledgeOptions {
+  initialChunks?: Array<{
+    content: string;
+    metadata?: Record<string, unknown>;
+  }>;
+  dimensions?: number;     // embedding dimensions (default: 384)
+  description?: string;    // tool description exposed to LLM
+}
+
+const knowledge = await createMockKnowledge({
+  initialChunks: [
+    { content: 'Lead: Acme Corp, score: 85', metadata: { source: 'crm' } },
+    { content: 'Lead: TechStart, score: 70', metadata: { source: 'crm' } },
+  ],
+});
+```
+
+### createMockKnowledgeSync (sync)
+
+Returns a `MockKnowledge` class instance — not a full `Knowledge` object, but suitable for testing agents that use knowledge queries. Supports `query()`, `add()`, `getAllChunks()`, `clear()`, and `toTool()`.
+
+```typescript
+const knowledge = createMockKnowledgeSync({
+  initialChunks: [
+    { content: 'Refund policy: 30-day no-questions-asked return' },
+  ],
+});
+
+// Use knowledge.toTool() to wire it as a tool into a mock Toolpack
+const tool = knowledge.toTool();   // returns a RequestToolDefinition
+```
+
+Uses simple keyword matching (not semantic similarity) for queries, which is sufficient for most test assertions.
+
+---
+
+## Testing patterns
+
+### Testing intent routing
+
+```typescript
+it('routes billing intent correctly', async () => {
+  const { agent } = createTestAgent(SupportAgent, {
+    mockResponses: [
+      { trigger: 'billing', response: 'Here is your billing summary.' },
+    ],
+  });
+
+  const result = await agent.invokeAgent({
+    intent: 'billing',
+    message: 'Show me my bills',
+    conversationId: 'c1',
+  });
+
+  expect(result.output).toBe('Here is your billing summary.');
+});
+```
+
+### Testing delegation
+
+```typescript
+import { AgentRegistry } from '@toolpack-sdk/agents';
+import { createTestAgent } from '@toolpack-sdk/agents/testing';
+
+it('delegates to data agent', async () => {
+  const { agent: mainAgent } = createTestAgent(OrchestratorAgent);
+  const { agent: dataAgent } = createTestAgent(DataAgent, {
+    defaultResponse: 'Data analysis complete.',
+  });
+
+  const registry = new AgentRegistry([mainAgent, dataAgent]);
+  await registry.start();
+
+  const result = await registry.invoke('orchestrator-agent', {
+    message: 'Analyse sales',
+    conversationId: 'c1',
+  });
+
+  expect(result.output).toContain('complete');
+});
+```
+
+### Testing conversation history
+
+```typescript
+it('remembers previous messages', async () => {
+  const { agent } = createTestAgent(MyAgent, {
+    mockResponses: [
+      { trigger: 'name is Bob', response: 'Nice to meet you, Bob.' },
+      { trigger: 'remember', response: 'You told me your name is Bob.' },
+    ],
+  });
+
+  await agent.invokeAgent({ message: 'My name is Bob', conversationId: 'conv-1' });
+
+  const result = await agent.invokeAgent({
+    message: 'Do you remember my name?',
+    conversationId: 'conv-1',   // same conversation
+  });
+
+  expect(result.output).toContain('Bob');
+});
+```
+
+### Testing lifecycle hooks
+
+```typescript
+it('calls onComplete after successful run', async () => {
+  const { agent } = createTestAgent(MyAgent, { defaultResponse: 'Done.' });
+
+  let completedWith: AgentResult | null = null;
+  agent.onComplete = async (result) => { completedWith = result; };
+
+  await agent.invokeAgent({ message: 'test', conversationId: 'c1' });
+
+  expect(completedWith?.output).toBe('Done.');
+});
+```
+
+### Testing error handling
+
+```typescript
+it('emits agent:error on failure', async () => {
+  const { agent } = createTestAgent(MyAgent);
+  const events = captureEvents(agent);
+
+  // Override invokeAgent to force an error
+  const original = agent.invokeAgent.bind(agent);
+  agent.invokeAgent = async () => { throw new Error('boom'); };
+
+  try {
+    await agent.invokeAgent({ message: 'test', conversationId: 'c1' });
+  } catch {
+    // expected
+  }
+
+  events.assertEvent('agent:error');
+  events.stop();
+});
+```
diff --git a/packages/toolpack-agents/docs/transport.md b/packages/toolpack-agents/docs/transport.md
new file mode 100644
index 0000000..ea74791
--- /dev/null
+++ b/packages/toolpack-agents/docs/transport.md
@@ -0,0 +1,203 @@
+# Transport & Delegation
+
+The transport layer routes agent-to-agent invocations. It sits between `AgentRegistry` and the individual agents, providing a pluggable mechanism for cross-agent communication.
+
+## Contents
+
+- [AgentTransport interface](#agenttransport-interface)
+- [LocalTransport](#localtransport)
+- [JsonRpcTransport](#jsonrpctransport)
+- [delegate() — fire-and-forget](#delegate--fire-and-forget)
+- [delegateAndWait() — synchronous delegation](#delegateandwait--synchronous-delegation)
+- [How delegation preserves history](#how-delegation-preserves-history)
+- [Delegation depth guard](#delegation-depth-guard)
+
+---
+
+## AgentTransport interface
+
+```typescript
+interface AgentTransport {
+  invoke(agentName: string, input: AgentInput): Promise<AgentResult>;
+}
+```
+
+The registry uses the transport to route `invoke()` calls. The default transport is `LocalTransport`.
+
+---
+
+## LocalTransport
+
+In-process delegation. Used automatically when you create an `AgentRegistry` without a transport override.
+
+```typescript
+import { LocalTransport } from '@toolpack-sdk/agents';
+
+// Created automatically by AgentRegistry:
+const registry = new AgentRegistry([agentA, agentB]);
+// registry._transport is a LocalTransport(registry)
+
+// Or create explicitly:
+const transport = new LocalTransport(registry);
+```
+
+### What it does
+
+When `transport.invoke(agentName, input)` is called:
+
+1. Resolves the target agent from the registry by name.
+2. Writes the inbound message to the **target agent's** `ConversationStore` as a `kind: 'agent'` participant (the delegating agent's name).
+3. Calls `target.invokeAgent(input)` directly (in-process).
+4. Writes the target agent's reply to the target's store as the target agent's own turn.
+5. Returns the `AgentResult`.
+
+This means the **target agent has full history** of the delegation exchange, enabling it to use `assemblePrompt()` to understand the conversation context.
+
+---
+
+## JsonRpcTransport
+
+For distributed deployments where agents run in separate processes or on separate servers.
+
+```typescript
+import { JsonRpcTransport, AgentJsonRpcServer } from '@toolpack-sdk/agents';
+
+// Client side (calling agent's process)
+const transport = new JsonRpcTransport({
+  endpoint: 'http://agent-server:8080/rpc',
+});
+
+const registry = new AgentRegistry([callerAgent], { transport });
+
+// Server side (target agent's process)
+const server = new AgentJsonRpcServer({
+  registry: targetRegistry,
+  port: 8080,
+  path: '/rpc',
+});
+await server.start();
+```
+
+The JSON-RPC protocol transmits `AgentInput` and returns `AgentResult` over HTTP.
+
+---
+
+## delegate() — fire-and-forget
+
+`delegate()` is a protected method on `BaseAgent`. It invokes another agent and **does not wait** for the result. Useful for spawning background work.
+
+```typescript
+protected async delegate(agentName: string, input: Partial<AgentInput>): Promise<void>
+```
+
+```typescript
+// Inside your agent's invokeAgent():
+async invokeAgent(input: AgentInput): Promise<AgentResult> {
+  // Kick off background analysis — don't wait
+  await this.delegate('data-agent', {
+    message: `Analyse sales data for ${input.context?.region}`,
+    context: { requestedBy: this.name },
+  });
+
+  return { output: 'Analysis started. Results will be available shortly.' };
+}
+```
+
+**What gets set automatically:**
+
+- `context.delegatedBy` is set to `this.name`
+- `conversationId` defaults to the current conversation's ID (or a new `delegation-<timestamp>` ID if none)
+
+Errors from the delegated agent are caught and logged but do not propagate to the caller.
+
+---
+
+## delegateAndWait() — synchronous delegation
+
+`delegateAndWait()` invokes another agent and **waits for the result** before continuing.
+
+```typescript
+protected async delegateAndWait(agentName: string, input: Partial<AgentInput>): Promise<AgentResult>
+```
+
+```typescript
+async invokeAgent(input: AgentInput): Promise<AgentResult> {
+  // First, get research results
+  const research = await this.delegateAndWait('research-agent', {
+    message: `Find the latest news on ${input.message}`,
+  });
+
+  // Then, use them to generate a report
+  const report = await this.run(
+    `Based on this research: ${research.output}\n\nWrite a concise report.`
+  );
+
+  return report;
+}
+```
+
+Both `delegate()` and `delegateAndWait()` require the agent to be registered with an `AgentRegistry`. Calling them on a standalone agent (without a registry) throws:
+
+```
+AgentError: Agent not registered - cannot use delegate()
+```
+
+---
+
+## How delegation preserves history
+
+When agent A delegates to agent B:
+
+```
+Agent A                          Agent B
+  │                                │
+  ├─ delegateAndWait('agent-b')    │
+  │                                │
+  │  LocalTransport.invoke()       │
+  │  ├─ store.append({             │
+  │  │    participant: { kind: 'agent', id: 'agent-a' },
+  │  │    content: <delegated message>
+  │  │  }) → written to Agent B's store
+  │  │                             │
+  │  └─ agent-b.invokeAgent()     │
+  │                               ├─ assemblePrompt reads history
+  │                               │  (sees agent-a's delegated message)
+  │                               │
+  │                               └─ returns result
+  │  ├─ store.append({            │
+  │  │    participant: { kind: 'agent', id: 'agent-b' },
+  │  │    content: <result>
+  │  │  }) → written to Agent B's store
+  │  │
+  │  └─ returns AgentResult to Agent A
+```
+
+Agent B's history reflects the full delegation exchange. If agent B is later invoked again in the same conversation, it will have context about what agent A asked.
+
+---
+
+## Delegation depth guard
+
+Circular delegation (A → B → A) is caught by `createDepthGuardInterceptor`. The `invocationDepth` counter in `InterceptorContext` increments with each delegation. When it exceeds `maxDepth` (default 5), a `DepthExceededError` is thrown.
+
+Add `createDepthGuardInterceptor` to your interceptors list for agents that participate in delegation chains:
+
+```typescript
+import { createDepthGuardInterceptor } from '@toolpack-sdk/agents';
+
+agent.interceptors = [
+  createDepthGuardInterceptor({ maxDepth: 5 }),
+];
+```
+
+---
+
+## Summary: delegate vs delegateAndWait vs sendTo
+
+| Method | Waits? | Requires registry? | Uses transport? | Target |
+|---|---|---|---|---|
+| `this.delegate(agentName, input)` | No | Yes | Yes (LocalTransport) | Agent |
+| `this.delegateAndWait(agentName, input)` | Yes | Yes | Yes (LocalTransport) | Agent |
+| `this.sendTo(channelName, message)` | No | Yes | No | Channel |
+| `registry.invoke(agentName, input)` | Yes | — | Yes | Agent |
+| `registry.sendTo(channelName, output)` | No | — | No | Channel |
diff --git a/packages/toolpack-agents/package.json b/packages/toolpack-agents/package.json
new file mode 100644
index 0000000..dbcb638
--- /dev/null
+++ b/packages/toolpack-agents/package.json
@@ -0,0 +1,117 @@
+{
+  "name": "@toolpack-sdk/agents",
+  "version": "1.4.0",
+  "description": "Agent layer for the Toolpack SDK - build, compose, and deploy AI agents with a consistent, extensible pattern",
+  "engines": {
+    "node": ">=20"
+  },
+  "type": "module",
+  "main": "dist/index.cjs",
+  "module": "dist/index.js",
+  "exports": {
+    ".": {
+      "types": "./dist/index.d.ts",
+      "import": "./dist/index.js",
+      "require": "./dist/index.cjs"
+    },
+    "./channels": {
+      "types": "./dist/channels/index.d.ts",
+      "import": "./dist/channels/index.js",
+      "require": "./dist/channels/index.cjs"
+    },
+    "./testing": {
+      "types": "./dist/testing/index.d.ts",
+      "import": "./dist/testing/index.js",
+      "require": "./dist/testing/index.cjs"
+    },
+    "./registry": {
+      "types": "./dist/registry/index.d.ts",
+      "import": "./dist/registry/index.js",
+      "require": "./dist/registry/index.cjs"
+    },
+    "./capabilities": {
+      "types": "./dist/capabilities/index.d.ts",
+      "import": "./dist/capabilities/index.js",
+      "require": "./dist/capabilities/index.cjs"
+    },
+    "./interceptors": {
+      "types": "./dist/interceptors/index.d.ts",
+      "import": "./dist/interceptors/index.js",
+      "require": "./dist/interceptors/index.cjs"
+    }
+  },
+  "types": "dist/index.d.ts",
+  "files": [
+    "dist",
+    "README.md"
+  ],
+  "scripts": {
+    "build": "tsup",
+    "build:dev": "tsup",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "watch": "tsup --watch",
+    "lint": "eslint src/**",
+    "publish:npm": "npm run build && npm run test && npm publish --access public"
+  },
+  "keywords": [
+    "ai",
+    "llm",
+    "agent",
+    "ai-agent",
+    "slack",
+    "telegram",
+    "webhook",
+    "cron",
+    "scheduler",
+    "typescript",
+    "sdk",
+    "toolpack"
+  ],
+  "author": "Sajeer (https://sajeerzeji.com)",
+  "license": "Apache-2.0",
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/toolpack-ai/toolpack-sdk.git"
+  },
+  "homepage": "https://toolpacksdk.com",
+  "bugs": {
+    "url": "https://github.com/toolpack-ai/toolpack-sdk/issues"
+  },
+  "peerDependencies": {
+    "@toolpack-sdk/knowledge": "^1.4.0",
+    "better-sqlite3": "^11.x",
+    "discord.js": "^14.x",
+    "nodemailer": "^6.x",
+    "toolpack-sdk": "^1.4.0",
+    "twilio": "^5.x"
+  },
+  "peerDependenciesMeta": {
+    "@toolpack-sdk/knowledge": {
+      "optional": true
+    },
+    "better-sqlite3": {
+      "optional": true
+    },
+    "discord.js": {
+      "optional": true
+    },
+    "nodemailer": {
+      "optional": true
+    },
+    "twilio": {
+      "optional": true
+    }
+  },
+  "devDependencies": {
+    "@types/node": "^25.3.2",
+    "@types/nodemailer": "^6.4.23",
+    "discord.js": "^14.26.2",
+    "twilio": "^5.13.1",
+    "typescript": "^5.9.3",
+    "vitest": "^4.0.18"
+  },
+  "dependencies": {
+    "cron-parser": "^5.5.0"
+  }
+}
diff --git a/packages/toolpack-agents/src/agent/agent-registry.test.ts b/packages/toolpack-agents/src/agent/agent-registry.test.ts
new file mode 100644
index 0000000..7faee83
--- /dev/null
+++ b/packages/toolpack-agents/src/agent/agent-registry.test.ts
@@ -0,0 +1,435 @@
+import { describe, it, expect, vi } from 'vitest';
+import { AgentRegistry } from './agent-registry.js';
+import { BaseAgent } from './base-agent.js';
+import { AgentInput, AgentResult, BaseAgentOptions } from './types.js';
+import { BaseChannel } from '../channels/base-channel.js';
+import type { Toolpack } from 'toolpack-sdk';
+import { CHAT_MODE } from 'toolpack-sdk';
+
+// Mock Toolpack
+const createMockToolpack = () => {
+  return {
+    generate: vi.fn().mockResolvedValue({
+      content: 'Mock response',
+      usage: { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+    }),
+    setMode: vi.fn(),
+    registerMode: vi.fn(),
+  } as unknown as Toolpack;
+};
+
+// Test agent implementation
+class TestAgent extends BaseAgent<'test_intent'> {
+  name = 'test-agent';
+  description = 'A test agent';
+  mode = CHAT_MODE;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput<'test_intent'>): Promise<AgentResult> {
+    return {
+      output: `Received: ${input.message}`,
+    };
+  }
+}
+
+// Test channel implementation
+class TestChannel extends BaseChannel {
+  readonly isTriggerChannel = false;
+  handler?: (input: AgentInput) => Promise<void>;
+  sent: { output: string; metadata?: Record<string, unknown> }[] = [];
+
+  listen(): void {}
+
+  async send(output: { output: string; metadata?: Record<string, unknown> }): Promise<void> {
+    this.sent.push(output as { output: string; metadata?: Record<string, unknown> });
+  }
+
+  normalize(incoming: unknown): AgentInput {
+    return { message: String(incoming) };
+  }
+
+  onMessage(handler: (input: AgentInput) => Promise<void>): void {
+    this.handler = handler;
+  }
+
+  async triggerMessage(input: AgentInput): Promise<void> {
+    if (this.handler) {
+      await this.handler(input);
+    }
+  }
+}
+
+describe('AgentRegistry', () => {
+  describe('constructor', () => {
+    it('should create with empty agents list', () => {
+      const registry = new AgentRegistry([]);
+      expect(registry).toBeDefined();
+    });
+
+    it('should create with agent instances', () => {
+      const mockToolpack = createMockToolpack();
+      const channel = new TestChannel();
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.channels = [channel];
+
+      const registry = new AgentRegistry([agent]);
+      expect(registry).toBeDefined();
+    });
+  });
+
+  describe('start', () => {
+    it('should bind message handlers and start channels', async () => {
+      const mockToolpack = createMockToolpack();
+      const channel = new TestChannel();
+      const spyListen = vi.spyOn(channel, 'listen');
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.channels = [channel];
+
+      const registry = new AgentRegistry([agent]);
+      await registry.start();
+
+      expect(spyListen).toHaveBeenCalled();
+      expect(channel.handler).toBeDefined();
+    });
+
+    it('should set agent registry reference', async () => {
+      const mockToolpack = createMockToolpack();
+      const channel = new TestChannel();
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.channels = [channel];
+
+      const registry = new AgentRegistry([agent]);
+      await registry.start();
+
+      const retrieved = registry.getAgent('test-agent');
+      expect(retrieved).toBeDefined();
+      expect(retrieved?._registry).toBe(registry);
+    });
+
+    it('should register named channels for sendTo() routing', async () => {
+      const mockToolpack = createMockToolpack();
+      const channel = new TestChannel();
+      channel.name = 'test-channel';
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.channels = [channel];
+
+      const registry = new AgentRegistry([agent]);
+      await registry.start();
+
+      const retrievedChannel = registry.getChannel('test-channel');
+      expect(retrievedChannel).toBe(channel);
+    });
+  });
+
+  describe('sendTo', () => {
+    it('should send to named channel', async () => {
+      const mockToolpack = createMockToolpack();
+      const channel = new TestChannel();
+      channel.name = 'my-channel';
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.channels = [channel];
+
+      const registry = new AgentRegistry([agent]);
+      await registry.start();
+
+      await registry.sendTo('my-channel', { output: 'Hello!' });
+
+      expect(channel.sent).toHaveLength(1);
+      expect(channel.sent[0]).toEqual({ output: 'Hello!' });
+    });
+
+    it('should throw for unknown channel', async () => {
+      const registry = new AgentRegistry([]);
+      await registry.start();
+
+      await expect(registry.sendTo('unknown', { output: 'test' }))
+        .rejects.toThrow('No channel registered with name "unknown"');
+    });
+  });
+
+  describe('getAgent', () => {
+    it('should return agent by name', async () => {
+      const mockToolpack = createMockToolpack();
+      const agent = new TestAgent({ toolpack: mockToolpack });
+
+      const registry = new AgentRegistry([agent]);
+      await registry.start();
+
+      const retrieved = registry.getAgent('test-agent');
+      expect(retrieved).toBeDefined();
+      expect(retrieved?.name).toBe('test-agent');
+    });
+
+    it('should return undefined for unknown agent', async () => {
+      const mockToolpack = createMockToolpack();
+      const agent = new TestAgent({ toolpack: mockToolpack });
+
+      const registry = new AgentRegistry([agent]);
+      await registry.start();
+
+      expect(registry.getAgent('unknown')).toBeUndefined();
+    });
+  });
+
+  describe('getAllAgents', () => {
+    it('should return all agents', async () => {
+      const mockToolpack = createMockToolpack();
+
+      class TestAgent2 extends BaseAgent {
+        name = 'test-agent-2';
+        description = 'Another test agent';
+        mode = CHAT_MODE;
+
+        constructor(options: BaseAgentOptions) {
+          super(options);
+        }
+
+        async invokeAgent(): Promise<AgentResult> {
+          return { output: 'Test 2' };
+        }
+      }
+
+      const agent1 = new TestAgent({ toolpack: mockToolpack });
+      const agent2 = new TestAgent2({ toolpack: mockToolpack });
+
+      const registry = new AgentRegistry([agent1, agent2]);
+      await registry.start();
+
+      const agents = registry.getAllAgents();
+      expect(agents).toHaveLength(2);
+      expect(agents.map(a => a.name)).toContain('test-agent');
+      expect(agents.map(a => a.name)).toContain('test-agent-2');
+    });
+  });
+
+  describe('stop', () => {
+    it('should clear agents and channels', async () => {
+      const mockToolpack = createMockToolpack();
+      const agent = new TestAgent({ toolpack: mockToolpack });
+
+      const registry = new AgentRegistry([agent]);
+      await registry.start();
+
+      expect(registry.getAgent('test-agent')).toBeDefined();
+
+      await registry.stop();
+
+      expect(registry.getAgent('test-agent')).toBeUndefined();
+    });
+
+    it('should stop channels with stop method', async () => {
+      const mockToolpack = createMockToolpack();
+
+      class StoppableChannel extends TestChannel {
+        stopped = false;
+        async stop(): Promise<void> {
+          this.stopped = true;
+        }
+      }
+
+      const channel = new StoppableChannel();
+      channel.name = 'stoppable';
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.channels = [channel];
+
+      const registry = new AgentRegistry([agent]);
+      await registry.start();
+      await registry.stop();
+
+      expect(channel.stopped).toBe(true);
+    });
+  });
+
+  describe('PendingAsksStore', () => {
+    describe('addPendingAsk', () => {
+      it('should add a pending ask', () => {
+        const registry = new AgentRegistry([]);
+        const ask = registry.addPendingAsk({
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'What is your name?',
+          context: {},
+          maxRetries: 2,
+          channelName: 'test-channel',
+        });
+
+        expect(ask.id).toBeDefined();
+        expect(ask.conversationId).toBe('test-conv');
+        expect(ask.question).toBe('What is your name?');
+        expect(ask.status).toBe('pending');
+        expect(ask.retries).toBe(0);
+        expect(ask.askedAt).toBeInstanceOf(Date);
+      });
+
+      it('should queue multiple asks for same conversation', () => {
+        const registry = new AgentRegistry([]);
+
+        const ask1 = registry.addPendingAsk({
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'First question?',
+          context: {},
+          maxRetries: 2,
+          channelName: 'test-channel',
+        });
+
+        const ask2 = registry.addPendingAsk({
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'Second question?',
+          context: {},
+          maxRetries: 2,
+          channelName: 'test-channel',
+        });
+
+        expect(ask1.id).not.toBe(ask2.id);
+      });
+    });
+
+    describe('getPendingAsk', () => {
+      it('should return the first pending ask', () => {
+        const registry = new AgentRegistry([]);
+        registry.addPendingAsk({
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'First question?',
+          context: {},
+          maxRetries: 2,
+          channelName: 'test-channel',
+        });
+
+        const pending = registry.getPendingAsk('test-conv');
+        expect(pending?.question).toBe('First question?');
+      });
+
+      it('should return undefined if no pending asks', () => {
+        const registry = new AgentRegistry([]);
+        const pending = registry.getPendingAsk('test-conv');
+        expect(pending).toBeUndefined();
+      });
+    });
+
+    describe('hasPendingAsks', () => {
+      it('should return true if has pending asks', () => {
+        const registry = new AgentRegistry([]);
+        registry.addPendingAsk({
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'Question?',
+          context: {},
+          maxRetries: 2,
+          channelName: 'test-channel',
+        });
+
+        expect(registry.hasPendingAsks('test-conv')).toBe(true);
+      });
+
+      it('should return false if no pending asks', () => {
+        const registry = new AgentRegistry([]);
+        expect(registry.hasPendingAsks('test-conv')).toBe(false);
+      });
+    });
+
+    describe('resolvePendingAsk', () => {
+      it('should resolve the ask', async () => {
+        const registry = new AgentRegistry([]);
+        const ask = registry.addPendingAsk({
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'Question?',
+          context: {},
+          maxRetries: 2,
+          channelName: 'test-channel',
+        });
+
+        await registry.resolvePendingAsk(ask.id, 'Answer');
+
+        expect(registry.getPendingAsk('test-conv')).toBeUndefined();
+      });
+
+      it('should auto-send next ask when resolving', async () => {
+        const registry = new AgentRegistry([]);
+        const ask1 = registry.addPendingAsk({
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'First question?',
+          context: {},
+          maxRetries: 2,
+          channelName: 'test-channel',
+        });
+
+        registry.addPendingAsk({
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'Second question?',
+          context: {},
+          maxRetries: 2,
+          channelName: 'test-channel',
+        });
+
+        expect(registry.getPendingAsk('test-conv')?.question).toBe('First question?');
+
+        const sendToMock = vi.fn().mockResolvedValue(undefined);
+        registry.sendTo = sendToMock;
+
+        await registry.resolvePendingAsk(ask1.id, 'Answer 1');
+
+        expect(sendToMock).toHaveBeenCalledWith('test-channel', { output: 'Second question?' });
+        expect(registry.getPendingAsk('test-conv')?.question).toBe('Second question?');
+      });
+    });
+
+    describe('incrementRetries', () => {
+      it('should increment retry count for a pending ask', () => {
+        const registry = new AgentRegistry([]);
+        const ask = registry.addPendingAsk({
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'Question?',
+          context: {},
+          maxRetries: 2,
+          channelName: 'test-channel',
+        });
+
+        expect(ask.retries).toBe(0);
+
+        expect(registry.incrementRetries(ask.id)).toBe(1);
+        expect(registry.incrementRetries(ask.id)).toBe(2);
+      });
+
+      it('should return undefined for non-existent ask', () => {
+        const registry = new AgentRegistry([]);
+        expect(registry.incrementRetries('non-existent-id')).toBeUndefined();
+      });
+    });
+
+    describe('stop clears pending asks', () => {
+      it('should clear pending asks on stop', async () => {
+        const registry = new AgentRegistry([]);
+
+        registry.addPendingAsk({
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'Question?',
+          context: {},
+          maxRetries: 2,
+          channelName: 'test-channel',
+        });
+
+        expect(registry.hasPendingAsks('test-conv')).toBe(true);
+
+        await registry.stop();
+
+        expect(registry.hasPendingAsks('test-conv')).toBe(false);
+      });
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/agent/agent-registry.ts b/packages/toolpack-agents/src/agent/agent-registry.ts
new file mode 100644
index 0000000..ee56d7e
--- /dev/null
+++ b/packages/toolpack-agents/src/agent/agent-registry.ts
@@ -0,0 +1,257 @@
+import { randomUUID } from 'crypto';
+import type { AgentInput, AgentOutput, AgentResult, IAgentRegistry, ChannelInterface, AgentInstance, PendingAsk } from './types.js';
+import type { BaseAgent } from './base-agent.js';
+import type { AgentTransport, AgentRegistryTransportOptions } from '../transport/types.js';
+import { LocalTransport } from '../transport/local-transport.js';
+
+/**
+ * Optional coordinator for multi-agent deployments.
+ *
+ * Accepts a list of agent instances (each carrying its own channels and
+ * interceptors). On `start()` it wires the registry reference into every agent
+ * so cross-agent features (sendTo, delegation, ask) work, then delegates
+ * channel lifecycle to each agent's own `start()` method.
+ *
+ * For a single-agent deployment you do not need this class at all — just call
+ * `agent.start()` directly.
+ */
+export class AgentRegistry implements IAgentRegistry {
+  private agentList: BaseAgent[];
+  private instances: Map<string, AgentInstance> = new Map();
+  private channels: Map<string, ChannelInterface> = new Map();
+
+  /** Transport for agent-to-agent communication */
+  _transport: AgentTransport;
+
+  /** In-memory store for pending human-in-the-loop questions. Stored as Map<conversationId, PendingAsk[]> */
+  private pendingAsks: Map<string, PendingAsk[]> = new Map();
+
+  /**
+   * @param agents Agent instances to coordinate. Each agent's `channels` and
+   *   `interceptors` are configured on the agent itself.
+   * @param options Optional transport override.
+   */
+  constructor(agents: BaseAgent[], options?: AgentRegistryTransportOptions) {
+    this.agentList = agents;
+    this._transport = options?.transport || new LocalTransport(this);
+  }
+
+  /**
+   * Start all agents.
+   *
+   * For each agent:
+   * 1. Ensures the agent's Toolpack instance is ready.
+   * 2. Sets `agent._registry = this` so cross-agent features are available
+   *    when the agent's channels start processing messages.
+   * 3. Registers named channels in the registry's routing table for `sendTo()`.
+   * 4. Calls `agent.start()` which binds message handlers and begins listening.
+   */
+  async start(): Promise<void> {
+    for (const agent of this.agentList) {
+      // Initialise toolpack before setting registry so it is ready when the
+      // first message arrives.
+      await agent._ensureToolpack();
+
+      // Wire registry so sendTo(), ask(), and delegate() work inside the agent.
+      agent._registry = this;
+
+      this.instances.set(agent.name, agent);
+
+      // Register named channels for sendTo() routing.
+      for (const channel of agent.channels ?? []) {
+        if (channel.name) {
+          this.channels.set(channel.name, channel);
+        }
+      }
+    }
+
+    // Start all agents (binds message handlers + begins listening).
+    for (const agent of this.agentList) {
+      await agent.start();
+    }
+  }
+
+  /**
+   * Send output to a named channel.
+   */
+  async sendTo(channelName: string, output: AgentOutput): Promise<void> {
+    const channel = this.channels.get(channelName);
+    if (!channel) {
+      throw new Error(`No channel registered with name "${channelName}"`);
+    }
+    await channel.send(output);
+  }
+
+  /**
+   * Get a registered agent instance by name.
+   */
+  getAgent(name: string): AgentInstance | undefined {
+    return this.instances.get(name);
+  }
+
+  /**
+   * Get all registered agent instances.
+   */
+  getAllAgents(): AgentInstance[] {
+    return Array.from(this.instances.values());
+  }
+
+  /**
+   * Get a registered channel by name.
+   */
+  getChannel(name: string): ChannelInterface | undefined {
+    return this.channels.get(name);
+  }
+
+  /**
+   * Invoke an agent by name through the transport layer.
+   * Used by BaseAgent.delegate() and BaseAgent.delegateAndWait().
+   */
+  async invoke(agentName: string, input: AgentInput): Promise<AgentResult> {
+    return this._transport.invoke(agentName, input);
+  }
+
+  /**
+   * Stop all agents and clean up resources.
+   */
+  async stop(): Promise<void> {
+    for (const agent of this.agentList) {
+      await agent.stop();
+    }
+
+    this.instances.clear();
+    this.channels.clear();
+    this.pendingAsks.clear();
+  }
+
+  // --- PendingAsksStore Methods ---
+
+  getPendingAsk(conversationId: string): PendingAsk | undefined {
+    const asks = this.pendingAsks.get(conversationId);
+    if (!asks || asks.length === 0) {
+      return undefined;
+    }
+
+    const now = new Date();
+    while (asks.length > 0) {
+      const front = asks[0];
+      if (front.expiresAt && front.expiresAt < now) {
+        asks.shift();
+      } else {
+        break;
+      }
+    }
+
+    if (asks.length === 0) {
+      this.pendingAsks.delete(conversationId);
+      return undefined;
+    }
+
+    return asks[0];
+  }
+
+  hasPendingAsks(conversationId: string): boolean {
+    const asks = this.pendingAsks.get(conversationId);
+    if (!asks || asks.length === 0) {
+      return false;
+    }
+
+    const now = new Date();
+    const validAsks = asks.filter(a => !a.expiresAt || a.expiresAt >= now);
+
+    if (validAsks.length === 0) {
+      this.pendingAsks.delete(conversationId);
+      return false;
+    }
+
+    if (validAsks.length !== asks.length) {
+      this.pendingAsks.set(conversationId, validAsks);
+    }
+
+    return validAsks.some(a => a.status === 'pending');
+  }
+
+  cleanupExpiredAsks(): number {
+    let removedCount = 0;
+    const now = new Date();
+
+    for (const [conversationId, asks] of this.pendingAsks.entries()) {
+      const validAsks = asks.filter(a => !a.expiresAt || a.expiresAt >= now);
+      removedCount += asks.length - validAsks.length;
+
+      if (validAsks.length === 0) {
+        this.pendingAsks.delete(conversationId);
+      } else if (validAsks.length !== asks.length) {
+        this.pendingAsks.set(conversationId, validAsks);
+      }
+    }
+
+    return removedCount;
+  }
+
+  addPendingAsk(
+    ask: Omit<PendingAsk, 'id' | 'askedAt' | 'retries' | 'status'>
+  ): PendingAsk {
+    const pendingAsk: PendingAsk = {
+      ...ask,
+      id: randomUUID(),
+      askedAt: new Date(),
+      retries: 0,
+      status: 'pending',
+    };
+
+    const existing = this.pendingAsks.get(ask.conversationId);
+    if (existing) {
+      existing.push(pendingAsk);
+    } else {
+      this.pendingAsks.set(ask.conversationId, [pendingAsk]);
+    }
+
+    return pendingAsk;
+  }
+
+  incrementRetries(id: string): number | undefined {
+    for (const asks of this.pendingAsks.values()) {
+      const ask = asks.find(a => a.id === id);
+      if (ask) {
+        ask.retries += 1;
+        return ask.retries;
+      }
+    }
+    return undefined;
+  }
+
+  async resolvePendingAsk(id: string, answer: string): Promise<void> {
+    for (const [conversationId, asks] of this.pendingAsks.entries()) {
+      const index = asks.findIndex(a => a.id === id);
+      if (index !== -1) {
+        asks[index].status = 'answered';
+        asks[index].answer = answer;
+
+        const channelName = asks[index].channelName;
+
+        asks.splice(index, 1);
+
+        if (asks.length > 0) {
+          const nextAsk = asks[0];
+          if (channelName && channelName.trim() !== '') {
+            try {
+              await this.sendTo(channelName, { output: nextAsk.question });
+            } catch (error) {
+              console.error(`[AgentRegistry] Failed to auto-send next ask: ${error instanceof Error ? error.message : 'Unknown error'}`);
+            }
+          } else {
+            console.warn(`[AgentRegistry] Cannot auto-send next ask: channelName is empty for conversation ${conversationId}`);
+          }
+        }
+
+        if (asks.length === 0) {
+          this.pendingAsks.delete(conversationId);
+        }
+        return;
+      }
+    }
+
+    throw new Error(`Pending ask with id "${id}" not found`);
+  }
+}
diff --git a/packages/toolpack-agents/src/agent/base-agent.test.ts b/packages/toolpack-agents/src/agent/base-agent.test.ts
new file mode 100644
index 0000000..fcc3084
--- /dev/null
+++ b/packages/toolpack-agents/src/agent/base-agent.test.ts
@@ -0,0 +1,1354 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { BaseAgent } from './base-agent.js';
+import { AgentInput, AgentResult, BaseAgentOptions } from './types.js';
+import type { Toolpack, ConversationStore, StoredMessage, ModeConfig } from 'toolpack-sdk';
+import { CHAT_MODE } from 'toolpack-sdk';
+
+// Mock Toolpack
+const createMockToolpack = () => {
+  return {
+    generate: vi.fn().mockResolvedValue({
+      content: 'Mock AI response',
+      usage: { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+    }),
+    setMode: vi.fn(),
+    registerMode: vi.fn(),
+  } as unknown as Toolpack;
+};
+
+const TEST_MODE: ModeConfig = {
+  ...CHAT_MODE,
+  name: 'test-agent-mode',
+  systemPrompt: 'You are a helpful test agent.',
+};
+
+// Test agent implementation
+class TestAgent extends BaseAgent<'greet' | 'help'> {
+  name = 'test-agent';
+  description = 'A test agent for unit testing';
+  mode = TEST_MODE;
+  provider = 'openai';
+  model = 'gpt-4';
+
+  beforeRunCalled = false;
+  completeCalled = false;
+  errorCalled = false;
+  stepCompleteCalled = false;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput<'greet' | 'help'>): Promise<AgentResult> {
+    if (input.intent === 'greet') {
+      return { output: 'Hello!' };
+    }
+    return this.run(input.message || '');
+  }
+
+  async onBeforeRun(): Promise<void> {
+    this.beforeRunCalled = true;
+  }
+
+  async onComplete(): Promise<void> {
+    this.completeCalled = true;
+  }
+
+  async onError(): Promise<void> {
+    this.errorCalled = true;
+  }
+
+  async onStepComplete(): Promise<void> {
+    this.stepCompleteCalled = true;
+  }
+}
+
+describe('BaseAgent', () => {
+  let mockToolpack: Toolpack;
+
+  beforeEach(() => {
+    mockToolpack = createMockToolpack();
+  });
+
+  describe('properties', () => {
+    it('should have required abstract properties', () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+
+      expect(agent.name).toBe('test-agent');
+      expect(agent.description).toBe('A test agent for unit testing');
+      expect(agent.mode.name).toBe('test-agent-mode');
+    });
+
+    it('should have optional identity properties', () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+
+      expect(agent.provider).toBe('openai');
+      expect(agent.model).toBe('gpt-4');
+    });
+
+    it('should have registry reference (set by AgentRegistry)', () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      expect(agent._registry).toBeUndefined();
+
+      const mockRegistry = { sendTo: vi.fn() };
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      expect(agent._registry).toBe(mockRegistry);
+    });
+
+    it('should have triggering channel reference', () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      expect(agent._triggeringChannel).toBeUndefined();
+
+      agent._triggeringChannel = 'slack-support';
+      expect(agent._triggeringChannel).toBe('slack-support');
+    });
+  });
+
+  describe('invokeAgent', () => {
+    it('should handle greet intent directly', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const result = await agent.invokeAgent({
+        intent: 'greet',
+        message: 'Say hello',
+        conversationId: 'test-1',
+      });
+
+      expect(result.output).toBe('Hello!');
+    });
+
+    it('should use run() for help intent', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const result = await agent.invokeAgent({
+        intent: 'help',
+        message: 'I need help',
+        conversationId: 'test-2',
+      });
+
+      expect(result.output).toBe('Mock AI response');
+      expect(mockToolpack.setMode).toHaveBeenCalledWith('test-agent-mode');
+    });
+  });
+
+  describe('run() execution engine', () => {
+    it('should register and set mode before generate', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      await agent.invokeAgent({
+        message: 'Test message',
+        conversationId: 'test-3',
+      });
+
+      expect(mockToolpack.registerMode).toHaveBeenCalledWith(TEST_MODE);
+      expect(mockToolpack.setMode).toHaveBeenCalledWith('test-agent-mode');
+      expect(mockToolpack.generate).toHaveBeenCalled();
+    });
+
+    it('should pass provider override to generate', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      await agent.invokeAgent({
+        message: 'Test',
+      });
+
+      expect(mockToolpack.generate).toHaveBeenCalledWith(
+        expect.objectContaining({
+          messages: expect.any(Array),
+          model: 'gpt-4',
+        }),
+        'openai'
+      );
+    });
+
+    it('should not inject systemPrompt directly (mode-owned now)', async () => {
+      // BaseAgent no longer pushes a system message; the mode's systemPrompt is
+      // injected by Toolpack.client via injectModeSystemPrompt. The mock Toolpack
+      // does not perform that injection, so request.messages should contain no
+      // system messages from BaseAgent itself.
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      await agent.invokeAgent({
+        message: 'Test message',
+      });
+
+      const generateCall = vi.mocked(mockToolpack.generate).mock.calls[0];
+      const request = generateCall[0] as { messages: Array<{ role: string; content: string }> };
+
+      const systemMessages = request.messages.filter(m => m.role === 'system');
+      expect(systemMessages).toHaveLength(0);
+    });
+
+    it('should return AgentResult with output and metadata', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const result = await agent.invokeAgent({
+        message: 'Test',
+        conversationId: 'test-5',
+      });
+
+      expect(result.output).toBe('Mock AI response');
+      expect(result.metadata).toBeDefined();
+      expect(result.metadata?.usage).toBeDefined();
+    });
+
+    it('should handle errors from generate', async () => {
+      const errorToolpack = createMockToolpack();
+      vi.mocked(errorToolpack.generate).mockRejectedValue(new Error('API Error'));
+
+      const agent = new TestAgent({ toolpack: errorToolpack });
+
+      await expect(agent.invokeAgent({
+        message: 'Test',
+        conversationId: 'test-6',
+      })).rejects.toThrow('API Error');
+    });
+  });
+
+  describe('lifecycle hooks', () => {
+    it('should call onBeforeRun before execution', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      await agent.invokeAgent({
+        message: 'Test',
+        conversationId: 'test-7',
+      });
+
+      expect(agent.beforeRunCalled).toBe(true);
+    });
+
+    it('should call onComplete after successful execution', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      await agent.invokeAgent({
+        message: 'Test',
+        conversationId: 'test-8',
+      });
+
+      expect(agent.completeCalled).toBe(true);
+    });
+
+    it('should call onError when execution fails', async () => {
+      const errorToolpack = createMockToolpack();
+      vi.mocked(errorToolpack.generate).mockRejectedValue(new Error('API Error'));
+
+      const agent = new TestAgent({ toolpack: errorToolpack });
+
+      try {
+        await agent.invokeAgent({
+          message: 'Test',
+          conversationId: 'test-9',
+        });
+      } catch {
+        // Expected
+      }
+
+      expect(agent.errorCalled).toBe(true);
+    });
+  });
+
+  describe('events', () => {
+    it('should emit agent:start event', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const startHandler = vi.fn();
+      agent.on('agent:start', startHandler);
+
+      await agent.invokeAgent({
+        message: 'Test',
+        conversationId: 'test-10',
+      });
+
+      expect(startHandler).toHaveBeenCalledWith({ message: 'Test' });
+    });
+
+    it('should emit agent:complete event', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const completeHandler = vi.fn();
+      agent.on('agent:complete', completeHandler);
+
+      await agent.invokeAgent({
+        message: 'Test',
+        conversationId: 'test-11',
+      });
+
+      expect(completeHandler).toHaveBeenCalledWith(
+        expect.objectContaining({
+          output: 'Mock AI response',
+        })
+      );
+    });
+
+    it('should emit agent:error event', async () => {
+      const errorToolpack = createMockToolpack();
+      vi.mocked(errorToolpack.generate).mockRejectedValue(new Error('API Error'));
+
+      const agent = new TestAgent({ toolpack: errorToolpack });
+      const errorHandler = vi.fn();
+      agent.on('agent:error', errorHandler);
+
+      try {
+        await agent.invokeAgent({
+          message: 'Test',
+          conversationId: 'test-12',
+        });
+      } catch {
+        // Expected
+      }
+
+      expect(errorHandler).toHaveBeenCalledWith(expect.any(Error));
+    });
+  });
+
+  describe('sendTo', () => {
+    it('should throw if registry not set', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+
+      await expect(agent['sendTo']('some-channel', 'message')).rejects.toThrow(
+        'Agent not registered - _registry not set'
+      );
+    });
+
+    it('should call registry.sendTo when registry is set', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockSendTo = vi.fn().mockResolvedValue(undefined);
+      agent._registry = { sendTo: mockSendTo } as unknown as import('./types.js').IAgentRegistry;
+
+      await agent['sendTo']('slack-channel', 'Hello from agent');
+
+      expect(mockSendTo).toHaveBeenCalledWith('slack-channel', {
+        output: 'Hello from agent',
+      });
+    });
+  });
+
+  describe('ask', () => {
+    it('should return AgentResult with waitingForHuman metadata', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockRegistry = {
+        sendTo: vi.fn().mockResolvedValue(undefined),
+        addPendingAsk: vi.fn().mockReturnValue({
+          id: 'test-conv:test-agent:1234567890',
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'What is your name?',
+          context: {},
+          maxRetries: 2,
+          status: 'pending',
+          retries: 0,
+          askedAt: new Date(),
+        }),
+      };
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      agent._triggeringChannel = 'slack-support';
+      agent._conversationId = 'test-conv';
+
+      const result = await agent['ask']('What is your name?');
+
+      expect(result.output).toBe('What is your name?');
+      expect(result.metadata?.waitingForHuman).toBe(true);
+      expect(result.metadata?.askId).toBeDefined();
+    });
+
+    it('should send question to triggering channel', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockSendTo = vi.fn().mockResolvedValue(undefined);
+      const mockRegistry = {
+        sendTo: mockSendTo,
+        addPendingAsk: vi.fn().mockReturnValue({
+          id: 'test-conv:test-agent:1234567890',
+          conversationId: 'test-conv',
+          agentName: 'test-agent',
+          question: 'What is your name?',
+          context: {},
+          maxRetries: 2,
+          status: 'pending',
+          retries: 0,
+          askedAt: new Date(),
+        }),
+      };
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      agent._triggeringChannel = 'slack-support';
+      agent._conversationId = 'test-conv';
+
+      await agent['ask']('What is your name?');
+
+      expect(mockSendTo).toHaveBeenCalledWith('slack-support', { output: 'What is your name?' });
+    });
+
+    it('should throw if no registry is set', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent._triggeringChannel = 'slack-support';
+      agent._conversationId = 'test-conv';
+
+      await expect(agent['ask']('What is your name?')).rejects.toThrow(
+        'Agent not registered - cannot use ask()'
+      );
+    });
+
+    it('should throw if no conversationId is available', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockRegistry = { sendTo: vi.fn() };
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      agent._triggeringChannel = 'slack-support';
+
+      await expect(agent['ask']('What is your name?')).rejects.toThrow(
+        'No conversationId available - ask() requires a conversation channel'
+      );
+    });
+
+    it('should throw if called from a trigger channel (ScheduledChannel)', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockRegistry = {
+        sendTo: vi.fn().mockResolvedValue(undefined),
+        addPendingAsk: vi.fn(),
+      };
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      agent._triggeringChannel = 'daily-report';
+      agent._conversationId = 'scheduled:test:2024-01-01';
+      agent._isTriggerChannel = true; // This flag is set by AgentRegistry for ScheduledChannel
+
+      await expect(agent['ask']('What is your name?')).rejects.toThrow(
+        'this.ask() called from a trigger channel (ScheduledChannel)'
+      );
+    });
+
+    it('should support custom context, maxRetries, and expiresIn options', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockAddPendingAsk = vi.fn().mockReturnValue({
+        id: 'test-conv:test-agent:1234567890',
+        conversationId: 'test-conv',
+        agentName: 'test-agent',
+        question: 'What is your name?',
+        context: { step: 3, data: 'test' },
+        maxRetries: 5,
+        expiresAt: expect.any(Date),
+        status: 'pending',
+        retries: 0,
+        askedAt: expect.any(Date),
+      });
+      const mockRegistry = {
+        sendTo: vi.fn().mockResolvedValue(undefined),
+        addPendingAsk: mockAddPendingAsk,
+      };
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      agent._triggeringChannel = 'slack-support';
+      agent._conversationId = 'test-conv';
+
+      await agent['ask']('What is your name?', {
+        context: { step: 3, data: 'test' },
+        maxRetries: 5,
+        expiresIn: 300000, // 5 minutes
+      });
+
+      expect(mockAddPendingAsk).toHaveBeenCalledWith(expect.objectContaining({
+        conversationId: 'test-conv',
+        agentName: 'test-agent',
+        question: 'What is your name?',
+        context: { step: 3, data: 'test' },
+        maxRetries: 5,
+        expiresAt: expect.any(Date),
+      }));
+    });
+  });
+
+  describe('getPendingAsk', () => {
+    it('should return pending ask from registry', () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockPendingAsk = {
+        id: 'test-conv:test-agent:1234567890',
+        conversationId: 'test-conv',
+        agentName: 'test-agent',
+        question: 'What is your name?',
+        context: {},
+        maxRetries: 2,
+        status: 'pending' as const,
+        retries: 0,
+        askedAt: new Date(),
+      };
+      const mockRegistry = {
+        getPendingAsk: vi.fn().mockReturnValue(mockPendingAsk),
+      };
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      agent._conversationId = 'test-conv';
+
+      const result = agent['getPendingAsk']();
+
+      expect(result).toEqual(mockPendingAsk);
+      expect(mockRegistry.getPendingAsk).toHaveBeenCalledWith('test-conv');
+    });
+
+    it('should return null if no registry', () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent._conversationId = 'test-conv';
+
+      const result = agent['getPendingAsk']();
+
+      expect(result).toBeNull();
+    });
+
+    it('should return null if no conversationId', () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockRegistry = { getPendingAsk: vi.fn() };
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+
+      const result = agent['getPendingAsk']();
+
+      expect(result).toBeNull();
+    });
+  });
+
+  describe('resolvePendingAsk', () => {
+    it('should resolve pending ask in registry', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockResolvePendingAsk = vi.fn().mockResolvedValue(undefined);
+      const mockRegistry = {
+        resolvePendingAsk: mockResolvePendingAsk,
+      };
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+
+      await agent['resolvePendingAsk']('ask-id-123', 'John');
+
+      expect(mockResolvePendingAsk).toHaveBeenCalledWith('ask-id-123', 'John');
+    });
+
+    it('should throw if no registry', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+
+      await expect(agent['resolvePendingAsk']('ask-id-123', 'John')).rejects.toThrow(
+        'Agent not registered - cannot resolve ask'
+      );
+    });
+  });
+
+  describe('evaluateAnswer', () => {
+    it('should use simpleValidation when provided', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const simpleValidation = vi.fn().mockReturnValue(true);
+
+      const result = await agent['evaluateAnswer']('What is your name?', 'John', {
+        simpleValidation,
+      });
+
+      expect(simpleValidation).toHaveBeenCalledWith('John');
+      expect(result).toBe(true);
+      expect(mockToolpack.generate).not.toHaveBeenCalled(); // No LLM call
+    });
+
+    it('should use LLM when simpleValidation not provided', async () => {
+      const evaluationToolpack = createMockToolpack();
+      vi.mocked(evaluationToolpack.generate).mockResolvedValue({
+        content: 'yes',
+        usage: { prompt_tokens: 20, completion_tokens: 1, total_tokens: 21 },
+      });
+
+      const agent = new TestAgent({ toolpack: evaluationToolpack });
+
+      const result = await agent['evaluateAnswer']('What is your name?', 'John');
+
+      expect(evaluationToolpack.generate).toHaveBeenCalled();
+      expect(result).toBe(true);
+    });
+
+    it('should return false when LLM evaluation returns no', async () => {
+      const evaluationToolpack = createMockToolpack();
+      vi.mocked(evaluationToolpack.generate).mockResolvedValue({
+        content: 'no',
+        usage: { prompt_tokens: 20, completion_tokens: 1, total_tokens: 21 },
+      });
+
+      const agent = new TestAgent({ toolpack: evaluationToolpack });
+
+      const result = await agent['evaluateAnswer']('What is your name?', '');
+
+      expect(result).toBe(false);
+    });
+  });
+
+  describe('extractSteps', () => {
+    it('should extract steps from plan in result', async () => {
+      const planToolpack = createMockToolpack();
+      vi.mocked(planToolpack.generate).mockResolvedValue({
+        content: 'Response',
+        plan: {
+          steps: [
+            {
+              number: 1,
+              description: 'Step 1',
+              status: 'completed',
+              result: { success: true },
+            },
+            {
+              number: 2,
+              description: 'Step 2',
+              status: 'in_progress',
+            },
+          ],
+        },
+      } as unknown as import('toolpack-sdk').CompletionResponse);
+
+      const agent = new TestAgent({ toolpack: planToolpack });
+      const result = await agent.invokeAgent({
+        message: 'Test',
+        conversationId: 'test-13',
+      });
+
+      expect(result.steps).toHaveLength(2);
+      expect(result.steps?.[0].number).toBe(1);
+      expect(result.steps?.[0].status).toBe('completed');
+      expect(result.steps?.[1].status).toBe('in_progress');
+    });
+
+    it('should handle results without steps', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const result = await agent.invokeAgent({
+        message: 'Test',
+        conversationId: 'test-14',
+      });
+
+      expect(result.steps).toBeUndefined();
+    });
+  });
+
+  describe('conversation history integration', () => {
+    it('auto-initialises conversationHistory to InMemoryConversationStore', () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      expect(agent.conversationHistory).toBeDefined();
+    });
+
+    it('injects conversation_search tool when _conversationId is set', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent._conversationId = 'test-conv';
+
+      await agent.invokeAgent({
+        message: 'Test message',
+        conversationId: 'test-conv',
+      });
+
+      expect(mockToolpack.generate).toHaveBeenCalledWith(
+        expect.objectContaining({
+          requestTools: expect.arrayContaining([
+            expect.objectContaining({ name: 'conversation_search' }),
+          ]),
+        }),
+        expect.anything()
+      );
+    });
+
+    it('does not inject search tool when _conversationId is absent', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      // _conversationId not set
+
+      await agent.invokeAgent({ message: 'Test message' });
+
+      expect(mockToolpack.generate).toHaveBeenCalledWith(
+        expect.objectContaining({ requestTools: undefined }),
+        expect.anything()
+      );
+    });
+
+    it('loads conversation history via assemblePrompt and passes projected messages to generate', async () => {
+      // Use matching agent id so addressed-only filter includes the prior turn.
+      const storedMessages: StoredMessage[] = [
+        { id: '1', conversationId: 'test-conv', participant: { kind: 'user', id: 'u1', displayName: 'Alice' }, content: 'Hello from user', timestamp: '2024-01-01T00:00:00Z', scope: 'channel' },
+        { id: '2', conversationId: 'test-conv', participant: { kind: 'agent', id: 'test-agent' }, content: 'Hello from assistant', timestamp: '2024-01-01T00:00:01Z', scope: 'channel' },
+      ];
+      const mockConversationHistory: ConversationStore = {
+        get: vi.fn().mockResolvedValue(storedMessages),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = mockConversationHistory;
+      // Disable addressed-only mode so all stored messages appear in the prompt.
+      agent.assemblerOptions = { addressedOnlyMode: false };
+      agent._conversationId = 'test-conv';
+
+      await agent.invokeAgent({ message: 'New message', conversationId: 'test-conv' });
+
+      // assemblePrompt calls store.get with an options object
+      expect(mockConversationHistory.get).toHaveBeenCalledWith('test-conv', expect.any(Object));
+
+      const generateCall = vi.mocked(mockToolpack.generate).mock.calls[0];
+      const request = generateCall[0] as { messages: Array<{ role: string; content: string }> };
+      const messages = request.messages;
+
+      // User message is projected as "Alice: Hello from user" (displayName prefix)
+      expect(messages.some(m => m.role === 'user' && m.content.includes('Hello from user'))).toBe(true);
+      // Agent's own turn is projected as assistant role, content verbatim
+      expect(messages.some(m => m.role === 'assistant' && m.content === 'Hello from assistant')).toBe(true);
+      // The triggering message is appended last
+      expect(messages.some(m => m.role === 'user' && m.content === 'New message')).toBe(true);
+    });
+
+    it('projects system, user, and agent turns correctly (addressed-only off)', async () => {
+      const storedMessages: StoredMessage[] = [
+        { id: '1', conversationId: 'test-conv', participant: { kind: 'system', id: 'system' }, content: 'You are helpful', timestamp: '2024-01-01T00:00:00Z', scope: 'channel' },
+        { id: '2', conversationId: 'test-conv', participant: { kind: 'user', id: 'u1' }, content: 'Hello', timestamp: '2024-01-01T00:00:01Z', scope: 'channel' },
+        { id: '3', conversationId: 'test-conv', participant: { kind: 'agent', id: 'test-agent' }, content: 'Hi!', timestamp: '2024-01-01T00:00:02Z', scope: 'channel' },
+      ];
+      const mockConversationHistory: ConversationStore = {
+        get: vi.fn().mockResolvedValue(storedMessages),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = mockConversationHistory;
+      agent.assemblerOptions = { addressedOnlyMode: false };
+      agent._conversationId = 'test-conv';
+
+      await agent.invokeAgent({ message: 'New message', conversationId: 'test-conv' });
+
+      const generateCall = vi.mocked(mockToolpack.generate).mock.calls[0];
+      const request = generateCall[0] as { messages: Array<{ role: string; content: string }> };
+      const messages = request.messages;
+
+      expect(messages.some(m => m.role === 'system' && m.content === 'You are helpful')).toBe(true);
+      expect(messages.some(m => m.role === 'user' && m.content.includes('Hello'))).toBe(true);
+      expect(messages.some(m => m.role === 'assistant' && m.content === 'Hi!')).toBe(true);
+      expect(messages.some(m => m.role === 'user' && m.content === 'New message')).toBe(true);
+    });
+
+    it('run() does not write to the store — capture-history interceptor owns writes', async () => {
+      const mockConversationHistory: ConversationStore = {
+        get: vi.fn().mockResolvedValue([]),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = mockConversationHistory;
+      agent._conversationId = 'test-conv';
+
+      // Call invokeAgent directly (not through a channel) — no capture interceptor runs.
+      await agent.invokeAgent({ message: 'User question', conversationId: 'test-conv' });
+
+      // run() must NOT call append — writes belong to capture-history.
+      expect(mockConversationHistory.append).not.toHaveBeenCalled();
+    });
+
+    it('should inject conversation_search as a request-scoped tool when store is available', async () => {
+      const mockConversationHistory: ConversationStore = {
+        get: vi.fn().mockResolvedValue([]),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = mockConversationHistory;
+      agent._conversationId = 'test-conv';
+
+      await agent.invokeAgent({
+        message: 'What did I say earlier?',
+        conversationId: 'test-conv',
+      });
+
+      const generateCall = vi.mocked(mockToolpack.generate).mock.calls[0];
+      const request = generateCall[0] as { requestTools?: Array<{ name: string }> };
+
+      expect(request.requestTools).toBeDefined();
+      expect(request.requestTools?.some(t => t.name === 'conversation_search')).toBe(true);
+    });
+
+    it('should pass a callable conversation_search request tool to the SDK', async () => {
+      const matchingMessage: StoredMessage = {
+        id: '1', conversationId: 'test-conv',
+        participant: { kind: 'user', id: 'u1' },
+        content: 'Hello world',
+        timestamp: '2024-01-01T00:00:00Z',
+        scope: 'channel',
+      };
+      const mockConversationHistory: ConversationStore = {
+        get: vi.fn().mockResolvedValue([]),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([matchingMessage]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = mockConversationHistory;
+      agent._conversationId = 'test-conv';
+
+      await agent.invokeAgent({
+        message: 'What did I say earlier?',
+        conversationId: 'test-conv',
+      });
+
+      const generateCall = vi.mocked(mockToolpack.generate).mock.calls[0];
+      const request = generateCall[0] as { requestTools?: Array<{ name: string; execute: (args: Record<string, unknown>) => Promise<unknown> }> };
+      const conversationTool = request.requestTools?.find(tool => tool.name === 'conversation_search');
+
+      expect(conversationTool).toBeDefined();
+      await expect(conversationTool?.execute({ query: 'hello' })).resolves.toEqual({
+        results: [{ role: 'user', content: 'Hello world', timestamp: '2024-01-01T00:00:00Z' }],
+        count: 1,
+      });
+    });
+
+    it('should skip conversation history operations when conversationId is undefined', async () => {
+      const mockConversationHistory: ConversationStore = {
+        get: vi.fn().mockResolvedValue([]),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = mockConversationHistory;
+
+      await agent.invokeAgent({
+        message: 'Test message',
+        // No conversationId
+      });
+
+      expect(mockConversationHistory.get).not.toHaveBeenCalled();
+      expect(mockConversationHistory.append).not.toHaveBeenCalled();
+    });
+
+    it('auto-wires agentAliases from channel botUserId into addressed-only filtering', async () => {
+      // When addressed-only mode is on, only messages authored by the agent
+      // OR mentioning one of its ids should appear in the prompt. A stored
+      // message that mentions the channel's bot user id (e.g. a Slack
+      // <@U_KAEL_BOT>) must match via the auto-wired alias.
+      const aliasId = 'U_KAEL_BOT';
+      const storedMessages: StoredMessage[] = [
+        {
+          id: '1', conversationId: 'test-conv',
+          participant: { kind: 'user', id: 'u_alice', displayName: 'Alice' },
+          content: 'Hey team, non-addressed chatter',
+          timestamp: '2024-01-01T00:00:00Z',
+          scope: 'channel',
+        },
+        {
+          id: '2', conversationId: 'test-conv',
+          participant: { kind: 'user', id: 'u_alice', displayName: 'Alice' },
+          content: 'Kael, what do you think?',
+          timestamp: '2024-01-01T00:00:01Z',
+          scope: 'channel',
+          metadata: { mentions: [aliasId] },
+        },
+      ];
+      const mockConversationHistory: ConversationStore = {
+        get: vi.fn().mockResolvedValue(storedMessages),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = mockConversationHistory;
+      agent._conversationId = 'test-conv';
+      // Simulate a channel that exposes botUserId (as SlackChannel / TelegramChannel do).
+      // The channel doesn't need to actually listen — _resolveAssemblerOptions()
+      // only reads the botUserId field.
+      agent.channels = [
+        { name: 'slack', isTriggerChannel: false, botUserId: aliasId, onMessage: () => {}, send: async () => {}, listen: () => {} } as unknown as (typeof agent.channels)[number],
+      ];
+      // addressed-only is the default, but set it explicitly for clarity.
+      agent.assemblerOptions = { addressedOnlyMode: true };
+
+      await agent.invokeAgent({ message: 'New message', conversationId: 'test-conv' });
+
+      const request = vi.mocked(mockToolpack.generate).mock.calls[0][0] as {
+        messages: Array<{ role: string; content: string }>;
+      };
+      // The addressed message must have been projected in.
+      expect(request.messages.some(m => m.content.includes('Kael, what do you think?'))).toBe(true);
+      // The non-addressed chatter must have been filtered out.
+      expect(request.messages.some(m => m.content.includes('non-addressed chatter'))).toBe(false);
+    });
+
+    it('merges manual agentAliases with channel botUserId (dedup preserved)', async () => {
+      const manualAlias = 'U_KAEL_MANUAL';
+      const channelAlias = 'U_KAEL_FROM_SLACK';
+      const storedMessages: StoredMessage[] = [
+        {
+          id: '1', conversationId: 'test-conv',
+          participant: { kind: 'user', id: 'u_alice' },
+          content: 'Manual-alias mention',
+          timestamp: '2024-01-01T00:00:00Z',
+          scope: 'channel',
+          metadata: { mentions: [manualAlias] },
+        },
+        {
+          id: '2', conversationId: 'test-conv',
+          participant: { kind: 'user', id: 'u_alice' },
+          content: 'Channel-alias mention',
+          timestamp: '2024-01-01T00:00:01Z',
+          scope: 'channel',
+          metadata: { mentions: [channelAlias] },
+        },
+      ];
+      const mockConversationHistory: ConversationStore = {
+        get: vi.fn().mockResolvedValue(storedMessages),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = mockConversationHistory;
+      agent._conversationId = 'test-conv';
+      agent.channels = [
+        { name: 'slack', isTriggerChannel: false, botUserId: channelAlias, onMessage: () => {}, send: async () => {}, listen: () => {} } as unknown as (typeof agent.channels)[number],
+      ];
+      agent.assemblerOptions = { addressedOnlyMode: true, agentAliases: [manualAlias] };
+
+      await agent.invokeAgent({ message: 'New message', conversationId: 'test-conv' });
+
+      const request = vi.mocked(mockToolpack.generate).mock.calls[0][0] as {
+        messages: Array<{ role: string; content: string }>;
+      };
+      // Both aliases should resolve to matches.
+      expect(request.messages.some(m => m.content.includes('Manual-alias mention'))).toBe(true);
+      expect(request.messages.some(m => m.content.includes('Channel-alias mention'))).toBe(true);
+    });
+
+    it('should continue without history when get fails', async () => {
+      const mockConversationHistory: ConversationStore = {
+        get: vi.fn().mockRejectedValue(new Error('Query failed')),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = mockConversationHistory;
+      agent._conversationId = 'test-conv';
+
+      const result = await agent.invokeAgent({
+        message: 'Test message',
+        conversationId: 'test-conv',
+      });
+
+      expect(result.output).toBe('Mock AI response');
+      expect(mockToolpack.generate).toHaveBeenCalled();
+    });
+
+    it('continues without history when assemblePrompt throws', async () => {
+      const mockConversationHistory: ConversationStore = {
+        get: vi.fn().mockRejectedValue(new Error('DB unavailable')),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = mockConversationHistory;
+      agent._conversationId = 'test-conv';
+
+      const result = await agent.invokeAgent({
+        message: 'Test message',
+        conversationId: 'test-conv',
+      });
+
+      // Should still call generate and return a result even when history fails.
+      expect(result.output).toBe('Mock AI response');
+      expect(mockToolpack.generate).toHaveBeenCalled();
+    });
+
+    it('should not leak conversation state between multiple agents', async () => {
+      const secret1: StoredMessage = { id: 's1', conversationId: 'conv-1', participant: { kind: 'user', id: 'u1' }, content: 'Secret from agent 1: API key is abc123', timestamp: new Date().toISOString(), scope: 'channel' };
+      const secret2: StoredMessage = { id: 's2', conversationId: 'conv-2', participant: { kind: 'user', id: 'u2' }, content: 'Secret from agent 2: Password is xyz789', timestamp: new Date().toISOString(), scope: 'channel' };
+
+      const store1: ConversationStore = {
+        get: vi.fn().mockResolvedValue([]),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockImplementation(async (_convId: string, query: string) =>
+          [secret1].filter(m => m.content.toLowerCase().includes(query.toLowerCase()))
+        ),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const store2: ConversationStore = {
+        get: vi.fn().mockResolvedValue([]),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockImplementation(async (_convId: string, query: string) =>
+          [secret2].filter(m => m.content.toLowerCase().includes(query.toLowerCase()))
+        ),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent1 = new TestAgent({ toolpack: mockToolpack });
+      agent1.conversationHistory = store1;
+      agent1._conversationId = 'conv-1';
+
+      const agent2 = new TestAgent({ toolpack: mockToolpack });
+      agent2.conversationHistory = store2;
+      agent2._conversationId = 'conv-2';
+
+      await agent1.invokeAgent({ message: 'test message 1', conversationId: 'conv-1' });
+      await agent2.invokeAgent({ message: 'test message 2', conversationId: 'conv-2' });
+
+      const call1 = vi.mocked(mockToolpack.generate).mock.calls[0];
+      const call2 = vi.mocked(mockToolpack.generate).mock.calls[1];
+
+      const request1 = typeof call1[0] === 'string' ? null : call1[0];
+      const request2 = typeof call2[0] === 'string' ? null : call2[0];
+
+      expect(request1).not.toBeNull();
+      expect(request2).not.toBeNull();
+
+      const tool1 = request1!.requestTools?.find((t: { name: string }) => t.name === 'conversation_search');
+      const tool2 = request2!.requestTools?.find((t: { name: string }) => t.name === 'conversation_search');
+
+      expect(tool1).toBeDefined();
+      expect(tool2).toBeDefined();
+
+      const results1 = await tool1!.execute({ query: 'Secret' });
+      const results2 = await tool2!.execute({ query: 'Secret' });
+
+      expect(results1.count).toBe(1);
+      expect(results1.results[0].content).toContain('agent 1');
+      expect(results1.results[0].content).toContain('abc123');
+      expect(results1.results[0].content).not.toContain('agent 2');
+      expect(results1.results[0].content).not.toContain('xyz789');
+
+      expect(results2.count).toBe(1);
+      expect(results2.results[0].content).toContain('agent 2');
+      expect(results2.results[0].content).toContain('xyz789');
+      expect(results2.results[0].content).not.toContain('agent 1');
+      expect(results2.results[0].content).not.toContain('abc123');
+
+      expect(store1.search).toHaveBeenCalledWith('conv-1', expect.any(String), expect.any(Object));
+      expect(store2.search).toHaveBeenCalledWith('conv-2', expect.any(String), expect.any(Object));
+    });
+
+    // --- Pillar 2 tests ---
+
+    it('isolation: conversation_search cannot reach turns from a different conversation in the same store', async () => {
+      // Shared store with turns for both conv-A and conv-B.
+      const turnA: StoredMessage = { id: 'a1', conversationId: 'conv-A', participant: { kind: 'user', id: 'u1' }, content: 'Secret in conv-A', timestamp: new Date().toISOString(), scope: 'channel' };
+      const turnB: StoredMessage = { id: 'b1', conversationId: 'conv-B', participant: { kind: 'user', id: 'u2' }, content: 'Secret in conv-B', timestamp: new Date().toISOString(), scope: 'channel' };
+
+      const sharedStore: ConversationStore = {
+        get: vi.fn().mockResolvedValue([]),
+        append: vi.fn().mockResolvedValue(undefined),
+        // Real scoping: only return turns whose conversationId matches the queried id.
+        search: vi.fn().mockImplementation(async (convId: string) =>
+          [turnA, turnB].filter(m => m.conversationId === convId)
+        ),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = sharedStore;
+      agent._conversationId = 'conv-A';
+
+      await agent.invokeAgent({ message: 'test', conversationId: 'conv-A' });
+
+      const tool = (vi.mocked(mockToolpack.generate).mock.calls[0][0] as {
+        requestTools?: Array<{ name: string; execute: (args: Record<string, unknown>) => Promise<{ results: Array<{ content: string }>; count: number }> }>;
+      }).requestTools?.find(t => t.name === 'conversation_search');
+
+      expect(tool).toBeDefined();
+
+      // The tool must call store.search with 'conv-A' (the closure-captured id).
+      expect(sharedStore.search).not.toHaveBeenCalled(); // not yet — execute hasn't been called
+      const result = await tool!.execute({ query: 'Secret' });
+
+      expect(sharedStore.search).toHaveBeenCalledWith('conv-A', 'Secret', expect.any(Object));
+      // conv-B's turn must not appear.
+      expect(result.count).toBe(1);
+      expect(result.results[0].content).toBe('Secret in conv-A');
+      expect(result.results.every((r: { content: string }) => !r.content.includes('conv-B'))).toBe(true);
+    });
+
+    it('adversarial: conversation_search ignores conversationId injected into args; always uses closure-captured id', async () => {
+      const legitimateTurn: StoredMessage = { id: 'l1', conversationId: 'conv-safe', participant: { kind: 'user', id: 'u1' }, content: 'Legitimate content', timestamp: new Date().toISOString(), scope: 'channel' };
+
+      const store: ConversationStore = {
+        get: vi.fn().mockResolvedValue([]),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([legitimateTurn]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      agent.conversationHistory = store;
+      agent._conversationId = 'conv-safe';
+
+      await agent.invokeAgent({ message: 'test', conversationId: 'conv-safe' });
+
+      const tool = (vi.mocked(mockToolpack.generate).mock.calls[0][0] as {
+        requestTools?: Array<{ name: string; execute: (args: Record<string, unknown>) => Promise<unknown> }>;
+      }).requestTools?.find(t => t.name === 'conversation_search');
+
+      expect(tool).toBeDefined();
+
+      // Simulate adversarial LLM call: injects a foreign conversationId into args.
+      await tool!.execute({ query: 'foo', conversationId: 'conv-other' });
+
+      // store.search must have been called with the closure-captured 'conv-safe', not 'conv-other'.
+      expect(store.search).toHaveBeenCalledWith('conv-safe', 'foo', expect.any(Object));
+      expect(store.search).not.toHaveBeenCalledWith('conv-other', expect.anything(), expect.anything());
+    });
+
+    it('delegation: delegated agent search is scoped to originating conversationId; resets for own next message', async () => {
+      // An agent that properly forwards the input conversationId to run() — as a real agent would.
+      class ConvAwareAgent extends BaseAgent {
+        name = 'conv-aware-agent';
+        description = 'Aware agent';
+        mode = TEST_MODE;
+        async invokeAgent(input: AgentInput): Promise<AgentResult> {
+          return this.run(input.message || '', undefined, { conversationId: input.conversationId });
+        }
+      }
+
+      const originatingConvId = 'orch-conv-99';
+      const ownConvId = 'target-own-conv-77';
+
+      const store: ConversationStore = {
+        get: vi.fn().mockResolvedValue([]),
+        append: vi.fn().mockResolvedValue(undefined),
+        search: vi.fn().mockResolvedValue([]),
+        deleteMessages: vi.fn().mockResolvedValue(undefined),
+      };
+
+      const delegatedAgent = new ConvAwareAgent({ toolpack: mockToolpack });
+      delegatedAgent.conversationHistory = store;
+
+      // Simulate delegation: registry calls invokeAgent with the originator's conversationId.
+      await delegatedAgent.invokeAgent({ message: 'delegated task', conversationId: originatingConvId });
+
+      const call1 = vi.mocked(mockToolpack.generate).mock.calls[0];
+      const tool1 = (call1[0] as {
+        requestTools?: Array<{ name: string; execute: (args: Record<string, unknown>) => Promise<unknown> }>;
+      }).requestTools?.find(t => t.name === 'conversation_search');
+
+      expect(tool1).toBeDefined();
+      await tool1!.execute({ query: 'test' });
+      // During delegation, search must be scoped to the originating conversation.
+      expect(store.search).toHaveBeenLastCalledWith(originatingConvId, 'test', expect.any(Object));
+
+      vi.mocked(mockToolpack.generate).mockClear();
+      vi.mocked(store.search).mockClear();
+
+      // Next inbound message with the agent's own conversationId — search must reset.
+      await delegatedAgent.invokeAgent({ message: 'own message', conversationId: ownConvId });
+
+      const call2 = vi.mocked(mockToolpack.generate).mock.calls[0];
+      const tool2 = (call2[0] as {
+        requestTools?: Array<{ name: string; execute: (args: Record<string, unknown>) => Promise<unknown> }>;
+      }).requestTools?.find(t => t.name === 'conversation_search');
+
+      expect(tool2).toBeDefined();
+      await tool2!.execute({ query: 'test' });
+      // After reset, search must be scoped to the agent's own conversation.
+      expect(store.search).toHaveBeenLastCalledWith(ownConvId, 'test', expect.any(Object));
+    });
+  });
+
+  describe('handlePendingAsk', () => {
+    it('should resolve ask and call onSufficient when answer is sufficient', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockResolvePendingAsk = vi.fn().mockResolvedValue(undefined);
+      const mockOnSufficient = vi.fn().mockResolvedValue({ output: 'Task continued' });
+
+      agent._registry = {
+        resolvePendingAsk: mockResolvePendingAsk,
+      } as unknown as import('./types.js').IAgentRegistry;
+
+      const pendingAsk = {
+        id: 'ask-123',
+        conversationId: 'conv-123',
+        agentName: 'test-agent',
+        question: 'What is your name?',
+        status: 'pending' as const,
+        retries: 0,
+        maxRetries: 2,
+        askedAt: new Date(),
+        channelName: 'slack',
+        context: { step: 1 },
+      } as import('./types.js').PendingAsk;
+
+      // Mock evaluateAnswer to return true (sufficient)
+      vi.spyOn(agent as unknown as { evaluateAnswer: () => Promise<boolean> }, 'evaluateAnswer').mockResolvedValue(true);
+
+      const result = await agent['handlePendingAsk'](pendingAsk, 'John Doe', mockOnSufficient);
+
+      // Verify ask was resolved
+      expect(mockResolvePendingAsk).toHaveBeenCalledWith('ask-123', 'John Doe');
+
+      // Verify onSufficient was called
+      expect(mockOnSufficient).toHaveBeenCalledWith('John Doe');
+
+      // Verify result
+      expect(result.output).toBe('Task continued');
+    });
+
+    it('should re-ask when answer is insufficient and retries remain', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockRegistry = {
+        resolvePendingAsk: vi.fn().mockResolvedValue(undefined),
+        incrementRetries: vi.fn().mockReturnValue(1),
+        sendTo: vi.fn().mockResolvedValue(undefined),
+        addPendingAsk: vi.fn().mockReturnValue({
+          id: 'ask-456',
+          question: 'I need a bit more clarity on: "What is your name?". Could you provide more details?',
+          status: 'pending',
+        }),
+      };
+
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      agent._triggeringChannel = 'slack';
+      agent._conversationId = 'conv-123';
+
+      const pendingAsk = {
+        id: 'ask-123',
+        conversationId: 'conv-123',
+        agentName: 'test-agent',
+        question: 'What is your name?',
+        status: 'pending' as const,
+        retries: 0,
+        maxRetries: 2,
+        askedAt: new Date(),
+        channelName: 'slack',
+        context: { step: 1 },
+      } as import('./types.js').PendingAsk;
+
+      // Mock evaluateAnswer to return false (insufficient)
+      vi.spyOn(agent as unknown as { evaluateAnswer: () => Promise<boolean> }, 'evaluateAnswer').mockResolvedValue(false);
+
+      const mockOnSufficient = vi.fn();
+
+      const result = await agent['handlePendingAsk'](pendingAsk, 'J', mockOnSufficient);
+
+      // Verify retry counter was incremented
+      expect(mockRegistry.incrementRetries).toHaveBeenCalledWith('ask-123');
+
+      // Verify onSufficient was NOT called
+      expect(mockOnSufficient).not.toHaveBeenCalled();
+
+      // Verify result indicates waiting for human (re-ask)
+      expect(result.metadata?.waitingForHuman).toBe(true);
+    });
+
+    it('should skip step when maxRetries exceeded and onInsufficient not provided', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockRegistry = {
+        resolvePendingAsk: vi.fn().mockResolvedValue(undefined),
+        sendTo: vi.fn().mockResolvedValue(undefined),
+      };
+
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      agent._triggeringChannel = 'slack';
+      agent._conversationId = 'conv-123';
+
+      const pendingAsk: import('./types.js').PendingAsk = {
+        id: 'ask-123',
+        conversationId: 'conv-123',
+        agentName: 'test-agent',
+        question: 'What is your name?',
+        retries: 2, // Already at max
+        maxRetries: 2,
+        status: 'pending',
+        askedAt: new Date(),
+        context: { step: 1 },
+        channelName: 'slack',
+      };
+
+      // Mock evaluateAnswer to return false (insufficient)
+      vi.spyOn(agent as unknown as { evaluateAnswer: () => Promise<boolean> }, 'evaluateAnswer').mockResolvedValue(false);
+
+      const mockOnSufficient = vi.fn();
+
+      const result = await agent['handlePendingAsk'](pendingAsk, 'J', mockOnSufficient);
+
+      // Verify ask was resolved with __insufficient__ marker
+      expect(mockRegistry.resolvePendingAsk).toHaveBeenCalledWith('ask-123', '__insufficient__');
+
+      // Verify user was notified (sendTo receives { output: message } object)
+      expect(mockRegistry.sendTo).toHaveBeenCalledWith(
+        'slack',
+        { output: 'I was unable to get enough information to proceed. Skipping this step.' }
+      );
+
+      // Verify onSufficient was NOT called
+      expect(mockOnSufficient).not.toHaveBeenCalled();
+
+      // Verify fallback result
+      expect(result.output).toBe('Step skipped due to insufficient input.');
+      expect(result.metadata?.skipped).toBe(true);
+      expect(result.metadata?.askId).toBe('ask-123');
+    });
+
+    it('should call custom onInsufficient callback when maxRetries exceeded', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockRegistry = {
+        resolvePendingAsk: vi.fn().mockResolvedValue(undefined),
+        sendTo: vi.fn().mockResolvedValue(undefined),
+      };
+
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      agent._triggeringChannel = 'slack';
+
+      const pendingAsk = {
+        id: 'ask-123',
+        conversationId: 'conv-123',
+        agentName: 'test-agent',
+        question: 'What is your name?',
+        status: 'pending' as const,
+        retries: 2,
+        maxRetries: 2,
+        askedAt: new Date(),
+        channelName: 'slack',
+        context: { step: 1 },
+      } as import('./types.js').PendingAsk;
+
+      // Mock evaluateAnswer to return false
+      vi.spyOn(agent as unknown as { evaluateAnswer: () => Promise<boolean> }, 'evaluateAnswer').mockResolvedValue(false);
+
+      const mockOnSufficient = vi.fn();
+      const mockOnInsufficient = vi.fn().mockReturnValue({
+        output: 'Custom fallback behavior',
+        metadata: { custom: true },
+      });
+
+      const result = await agent['handlePendingAsk'](
+        pendingAsk,
+        'J',
+        mockOnSufficient,
+        mockOnInsufficient
+      );
+
+      // Verify custom callback was called
+      expect(mockOnInsufficient).toHaveBeenCalled();
+
+      // Verify custom result returned
+      expect(result.output).toBe('Custom fallback behavior');
+      expect(result.metadata?.custom).toBe(true);
+    });
+
+    it('should skip notification if no triggering channel available', async () => {
+      const agent = new TestAgent({ toolpack: mockToolpack });
+      const mockRegistry = {
+        resolvePendingAsk: vi.fn().mockResolvedValue(undefined),
+        sendTo: vi.fn().mockResolvedValue(undefined),
+      };
+
+      agent._registry = mockRegistry as unknown as import('./types.js').IAgentRegistry;
+      // No _triggeringChannel set
+
+      const pendingAsk = {
+        id: 'ask-123',
+        conversationId: 'conv-123',
+        agentName: 'test-agent',
+        question: 'What is your name?',
+        status: 'pending' as const,
+        retries: 2,
+        maxRetries: 2,
+        askedAt: new Date(),
+        channelName: 'slack',
+        context: { step: 1 },
+      } as import('./types.js').PendingAsk;
+
+      // Mock evaluateAnswer to return false
+      vi.spyOn(agent as unknown as { evaluateAnswer: () => Promise<boolean> }, 'evaluateAnswer').mockResolvedValue(false);
+
+      const mockOnSufficient = vi.fn();
+
+      await agent['handlePendingAsk'](pendingAsk, 'J', mockOnSufficient);
+
+      // Verify sendTo was NOT called (no channel to send to)
+      expect(mockRegistry.sendTo).not.toHaveBeenCalled();
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/agent/base-agent.ts b/packages/toolpack-agents/src/agent/base-agent.ts
new file mode 100644
index 0000000..1f67f01
--- /dev/null
+++ b/packages/toolpack-agents/src/agent/base-agent.ts
@@ -0,0 +1,736 @@
+import { EventEmitter } from 'events';
+import type { RequestToolDefinition, ConversationStore, AssemblerOptions, ModeConfig } from 'toolpack-sdk';
+import { Toolpack, InMemoryConversationStore } from 'toolpack-sdk';
+import type { Interceptor } from '../interceptors/types.js';
+import { composeChain, executeChain } from '../interceptors/chain.js';
+import { createCaptureInterceptor, CAPTURE_INTERCEPTOR_MARKER } from '../interceptors/builtins/capture-history.js';
+import { assemblePrompt } from '../history/assembler.js';
+import type { AgentInput, AgentResult, AgentOutput, AgentRunOptions, WorkflowStep, IAgentRegistry, PendingAsk, ChannelInterface, BaseAgentOptions } from './types.js';
+import { AgentError } from './errors.js';
+
+/**
+ * Abstract base class for all agents.
+ * Extend this to create custom agents with specific behaviors.
+ */
+export abstract class BaseAgent<TIntent extends string = string> extends EventEmitter {
+  // --- Required properties (must be set by subclasses) ---
+  /** Unique agent identifier */
+  abstract name: string;
+
+  /** Human-readable description of what this agent does */
+  abstract description: string;
+
+  /**
+   * Mode this agent runs in. Each agent owns a full ModeConfig including its
+   * system prompt, allowed tools, workflow, and tool-search policy. The mode
+   * is registered with the Toolpack on first run and activated for every
+   * invocation.
+   *
+   * Use built-in modes (AGENT_MODE, CHAT_MODE, CODING_MODE) as a base, or
+   * compose a custom ModeConfig.
+   */
+  abstract mode: ModeConfig | string;
+
+  // --- Optional identity properties ---
+  /** Provider override (e.g., 'anthropic', 'openai') - inherits from Toolpack if not set */
+  provider?: string;
+
+  /** Model override - inherits from provider default if not set */
+  model?: string;
+
+  // --- Optional behavior properties ---
+  /** Workflow configuration merged on top of mode config */
+  workflow?: Record<string, unknown>;
+
+  /**
+   * Conversation history store. Auto-initialised to `InMemoryConversationStore` in the
+   * constructor so subclass field initialisers (e.g. `interceptors = [createCaptureInterceptor({
+   * store: this.conversationHistory })]`) can reference it safely. Replace with a
+   * database-backed implementation for production persistence.
+   */
+  conversationHistory: ConversationStore;
+
+  /**
+   * Options forwarded to `assemblePrompt()` when `run()` builds LLM context from history.
+   * Defaults to `assemblePrompt`'s own defaults (addressed-only mode on, 3 000-token budget).
+   */
+  assemblerOptions?: AssemblerOptions;
+
+  /** Channels this agent listens on and sends responses to */
+  channels: ChannelInterface[] = [];
+
+  /** Interceptors applied to every inbound message before invokeAgent is called */
+  interceptors: Interceptor[] = [];
+
+  // --- Internal references ---
+  /** Reference to the registry for sendTo() and delegation support */
+  _registry?: IAgentRegistry;
+
+  /**
+   * Invocation-scoped context fields — set by `_bindChannel` immediately before
+   * calling `invokeAgent` and read inside `run()`, `ask()`, and `delegate()`.
+   *
+   * KNOWN LIMITATION: these are instance-level fields, not async-local storage.
+   * Two different conversations processed concurrently by the same agent can
+   * clobber each other's values. The conversation lock serialises within a single
+   * conversationId, but distinct conversationIds run concurrently.
+   *
+   * Fix: replace with `AsyncLocalStorage` in a future release. For now, agents
+   * that call `this.run()` while processing multiple concurrent conversations
+   * should pass `conversationId` explicitly to avoid relying on these fields.
+   */
+  _triggeringChannel?: string;
+  _conversationId?: string;
+  _isTriggerChannel?: boolean;
+
+  protected toolpack!: Toolpack;
+
+  private readonly _initConfig?: { apiKey: string; provider?: string; model?: string };
+  private _ownedToolpack = false;
+  private readonly _conversationLocks = new Map<string, Promise<void>>();
+
+  constructor(options: BaseAgentOptions) {
+    super();
+    // Auto-init here (before child field initialisers run) so that subclass
+    // field expressions like `interceptors = [createCaptureInterceptor({ store:
+    // this.conversationHistory })]` see a live store, not undefined.
+    this.conversationHistory = new InMemoryConversationStore();
+    if ('toolpack' in options) {
+      this.toolpack = options.toolpack;
+    } else {
+      this._initConfig = options;
+    }
+  }
+
+  /**
+   * Ensure the Toolpack instance is ready.
+   * No-op if the toolpack was provided at construction time.
+   * Creates and owns the instance from `apiKey` if it was not.
+   */
+  async _ensureToolpack(): Promise<void> {
+    if (this.toolpack) return;
+    if (!this._initConfig) {
+      throw new Error(`[${this.name ?? 'agent'}] Cannot start: no apiKey or toolpack provided`);
+    }
+    this.toolpack = await Toolpack.init({
+      provider: this._initConfig.provider ?? 'anthropic',
+      apiKey: this._initConfig.apiKey,
+      model: this._initConfig.model,
+    });
+    this._ownedToolpack = true;
+  }
+
+  /**
+   * Start the agent: initialise Toolpack (if needed), bind message handlers to all
+   * configured channels, and begin listening.
+   *
+   * When using AgentRegistry, the registry calls this after setting `_registry`.
+   * For standalone single-agent deployments, call this directly.
+   */
+  async start(): Promise<void> {
+    await this._ensureToolpack();
+    // Register and activate the agent's mode as the Toolpack default so the
+    // startup log reflects the agent (e.g. "Kael") instead of the built-in
+    // default ("Chat").
+    if (this.mode) {
+      if (typeof this.mode === 'string') {
+        this.toolpack.setMode(this.mode);
+      } else {
+        this.toolpack.registerMode(this.mode);
+        this.toolpack.setMode(this.mode.name);
+      }
+    }
+    for (const channel of this.channels) {
+      this._bindChannel(channel);
+      channel.listen();
+    }
+  }
+
+  /**
+   * Stop all channels and release resources owned by this agent.
+   */
+  async stop(): Promise<void> {
+    for (const channel of this.channels) {
+      if ('stop' in channel && typeof (channel as { stop?: unknown }).stop === 'function') {
+        await (channel as { stop: () => Promise<void> }).stop();
+      }
+    }
+    if (this._ownedToolpack) {
+      await this.toolpack.disconnect?.();
+    }
+  }
+
+  /**
+   * Main entry point for agent invocation.
+   * Implement this to handle incoming messages and route to appropriate logic.
+   */
+  abstract invokeAgent(input: AgentInput<TIntent>): Promise<AgentResult>;
+
+  /**
+   * Execute the agent using the Toolpack SDK.
+   *
+   * @param message - The user message to process.
+   * @param _options - Optional per-run workflow overrides.
+   * @param context - Optional context overrides. Supply `conversationId` here when
+   *   invoking from `invokeAgent()` to avoid the instance-level `_conversationId`
+   *   race that occurs when the same agent handles multiple concurrent conversations.
+   */
+  protected async run(
+    message: string,
+    _options?: AgentRunOptions,
+    context?: { conversationId?: string },
+  ): Promise<AgentResult> {
+    // Prefer the explicitly supplied conversationId; fall back to the
+    // instance-level field (set by _bindChannel) for channel-driven invocations.
+    const convId = context?.conversationId ?? this._conversationId;
+
+    await this.onBeforeRun({ message, conversationId: convId } as AgentInput<TIntent>);
+    this.emit('agent:start', { message });
+
+    try {
+      // Register-then-activate. registerMode is idempotent for the same name,
+      // so calling it on every run is cheap and avoids requiring callers to
+      // pre-wire the mode in Toolpack.init({ customModes }).
+      if (typeof this.mode === 'string') {
+        this.toolpack.setMode(this.mode);
+      } else {
+        this.toolpack.registerMode(this.mode);
+        this.toolpack.setMode(this.mode.name);
+      }
+
+      // System prompt is now owned by the mode and injected by the Toolpack
+      // client (see injectModeSystemPrompt). BaseAgent no longer pushes its
+      // own system message.
+      const messages: Array<{ role: 'system' | 'user' | 'assistant'; content: string }> = [];
+
+      // Load history via assemblePrompt: proper multi-participant projection,
+      // addressed-only mode, token budget, and rolling summary support.
+      // Writes are handled exclusively by the capture-history interceptor —
+      // run() is a read-only consumer of history.
+      if (convId) {
+        try {
+          const assembled = await assemblePrompt(
+            this.conversationHistory,
+            convId,
+            this.name,
+            this.name,
+            this._resolveAssemblerOptions(),
+          );
+          messages.push(...assembled.messages);
+        } catch {
+          // History fetch failure is non-fatal — continue without context.
+        }
+      }
+
+      messages.push({ role: 'user', content: message });
+
+      // Expose a search tool when a conversation is active so the LLM can
+      // retrieve specific past turns beyond the assembled context window.
+      const requestTools: RequestToolDefinition[] = [];
+      if (convId) {
+        const store = this.conversationHistory;
+        requestTools.push({
+          name: 'conversation_search',
+          displayName: 'Conversation Search',
+          description: 'Search past conversation history for specific information, questions, or topics mentioned earlier in this conversation.',
+          category: 'search',
+          parameters: {
+            type: 'object',
+            properties: {
+              query: { type: 'string', description: 'Keywords or phrases to search for in conversation history.' },
+              limit: { type: 'number', description: 'Maximum number of results to return (default: 5).' },
+            },
+            required: ['query'],
+          },
+          execute: async (args: Record<string, unknown>) => {
+            // Pillar 2 invariant: `convId` is closure-captured from run() intentionally.
+            // Do NOT accept `args.conversationId` or any other channel/conversation
+            // identifier from the LLM — doing so would let an adversarial prompt
+            // reach turns from a different conversation. See §1.6 of
+            // development/plan-docs/AGENT_CONFIDENTIALITY_AND_KNOWLEDGE.md.
+            const results = await store.search(convId, String(args.query ?? ''), {
+              limit: typeof args.limit === 'number' ? args.limit : 5,
+            });
+            return {
+              results: results.map(m => ({
+                role: m.participant.kind === 'agent' ? 'assistant' : 'user',
+                content: m.content,
+                timestamp: m.timestamp,
+              })),
+              count: results.length,
+            };
+          },
+        });
+      }
+
+      const result = await this.toolpack.generate(
+        {
+          messages,
+          model: this.model || '',
+          requestTools: requestTools.length > 0 ? requestTools : undefined,
+        },
+        this.provider
+      );
+
+      const agentResult: AgentResult = {
+        output: result.content || '',
+        steps: this.extractSteps(result),
+        metadata: result.usage ? { usage: result.usage } : undefined,
+      };
+
+      await this.onComplete(agentResult);
+      this.emit('agent:complete', agentResult);
+
+      return agentResult;
+    } catch (error) {
+      await this.onError(error as Error);
+      this.emit('agent:error', error);
+      throw error;
+    }
+  }
+
+  /**
+   * Returns extra identity strings (platform user ids, bot ids) that should
+   * be treated as this agent for the purposes of `addressed-only` mode in
+   * `assemblePrompt`.
+   *
+   * The default implementation collects `botUserId` from every attached channel
+   * that exposes it (e.g. `SlackChannel` after `auth.test` resolves). Override
+   * this to add further aliases.
+   */
+  protected getAgentAliases(): string[] {
+    const aliases: string[] = [];
+    for (const channel of this.channels) {
+      const botUserId = (channel as unknown as { botUserId?: string }).botUserId;
+      if (botUserId) aliases.push(botUserId);
+    }
+    return aliases;
+  }
+
+  /**
+   * Send a message to a named channel via the registry.
+   */
+  protected async sendTo(channelName: string, message: string): Promise<void> {
+    if (!this._registry) {
+      throw new Error('Agent not registered - _registry not set');
+    }
+    await this._registry.sendTo(channelName, { output: message });
+  }
+
+  /**
+   * Ask the user a question and pause execution.
+   */
+  protected async ask(
+    question: string,
+    options?: {
+      context?: Record<string, unknown>;
+      maxRetries?: number;
+      expiresIn?: number;
+    }
+  ): Promise<AgentResult> {
+    if (!this._registry) {
+      throw new AgentError('Agent not registered - cannot use ask()');
+    }
+
+    if (!this._conversationId) {
+      throw new AgentError('No conversationId available - ask() requires a conversation channel');
+    }
+
+    if (this._isTriggerChannel) {
+      throw new AgentError(
+        'this.ask() called from a trigger channel (ScheduledChannel). ' +
+          'Trigger channels have no human recipient — use a conversation channel (Slack, Telegram, Webhook) instead.'
+      );
+    }
+
+    if (!this._triggeringChannel || this._triggeringChannel.trim() === '') {
+      throw new AgentError(
+        'Cannot use ask() - no triggering channel available. ' +
+          'The channel must have a name registered with AgentRegistry.'
+      );
+    }
+
+    const pendingAsk = this._registry.addPendingAsk({
+      conversationId: this._conversationId,
+      agentName: this.name,
+      question,
+      context: options?.context ?? {},
+      maxRetries: options?.maxRetries ?? 2,
+      expiresAt: options?.expiresIn ? new Date(Date.now() + options.expiresIn) : undefined,
+      channelName: this._triggeringChannel,
+    });
+
+    await this.sendTo(this._triggeringChannel, question);
+
+    return {
+      output: question,
+      metadata: {
+        waitingForHuman: true,
+        askId: pendingAsk.id,
+      },
+    };
+  }
+
+  /**
+   * Get the current pending ask for a conversation.
+   */
+  protected getPendingAsk(conversationId?: string): PendingAsk | null {
+    if (!this._registry) {
+      return null;
+    }
+    const convId = conversationId ?? this._conversationId;
+    if (!convId) {
+      return null;
+    }
+    return this._registry.getPendingAsk(convId) ?? null;
+  }
+
+  /**
+   * Resolve a pending ask with an answer.
+   */
+  protected async resolvePendingAsk(id: string, answer: string): Promise<void> {
+    if (!this._registry) {
+      throw new AgentError('Agent not registered - cannot resolve ask');
+    }
+    await this._registry.resolvePendingAsk(id, answer);
+  }
+
+  /**
+   * Evaluate if an answer sufficiently addresses a question.
+   */
+  protected async evaluateAnswer(
+    question: string,
+    answer: string,
+    options?: {
+      simpleValidation?: (answer: string) => boolean;
+    }
+  ): Promise<boolean> {
+    if (options?.simpleValidation) {
+      return options.simpleValidation(answer);
+    }
+
+    const result = await this.run(
+      `Evaluate if this answer sufficiently addresses the question.\n\nQuestion: "${question}"\nAnswer: "${answer}"\n\nIs this answer sufficient? Reply with ONLY "yes" or "no".`,
+      { workflow: { mode: 'single-shot' } }
+    );
+
+    return result.output.toLowerCase().trim().startsWith('yes');
+  }
+
+  /**
+   * Handle a pending ask reply with automatic retry logic.
+   */
+  protected async handlePendingAsk(
+    pending: PendingAsk,
+    reply: string,
+    onSufficient: (answer: string) => Promise<AgentResult> | AgentResult,
+    onInsufficient?: () => Promise<AgentResult> | AgentResult
+  ): Promise<AgentResult> {
+    const sufficient = await this.evaluateAnswer(pending.question, reply, {
+      simpleValidation: (a) => a.trim().length > 3,
+    });
+
+    if (sufficient) {
+      await this.resolvePendingAsk(pending.id, reply);
+      return onSufficient(reply);
+    }
+
+    if (pending.retries >= pending.maxRetries) {
+      await this.resolvePendingAsk(pending.id, '__insufficient__');
+
+      if (this._triggeringChannel) {
+        await this.sendTo(
+          this._triggeringChannel,
+          'I was unable to get enough information to proceed. Skipping this step.'
+        );
+      }
+
+      if (onInsufficient) {
+        return onInsufficient();
+      }
+
+      return {
+        output: 'Step skipped due to insufficient input.',
+        metadata: { skipped: true, askId: pending.id },
+      };
+    }
+
+    this._registry?.incrementRetries(pending.id);
+
+    return this.ask(
+      `I need a bit more clarity on: "${pending.question}". Could you provide more details?`,
+      {
+        context: pending.context,
+        maxRetries: pending.maxRetries,
+      }
+    );
+  }
+
+  /**
+   * Delegate a task to another agent by name (fire-and-forget).
+   */
+  protected async delegate(
+    agentName: string,
+    input: Partial<AgentInput>
+  ): Promise<void> {
+    if (!this._registry) {
+      throw new AgentError('Agent not registered - cannot use delegate()');
+    }
+
+    const fullInput: AgentInput = {
+      message: input.message,
+      intent: input.intent,
+      data: input.data,
+      context: {
+        ...(input.context || {}),
+        delegatedBy: this.name,
+      },
+      conversationId: input.conversationId || this._conversationId || `delegation-${Date.now()}`,
+    };
+
+    this._registry.invoke(agentName, fullInput).catch((error: Error) => {
+      console.error(`[${this.name}] Delegation to ${agentName} failed:`, error.message);
+    });
+  }
+
+  /**
+   * Delegate a task to another agent and wait for the result.
+   */
+  protected async delegateAndWait(
+    agentName: string,
+    input: Partial<AgentInput>
+  ): Promise<AgentResult> {
+    if (!this._registry) {
+      throw new AgentError('Agent not registered - cannot use delegateAndWait()');
+    }
+
+    const fullInput: AgentInput = {
+      message: input.message,
+      intent: input.intent,
+      data: input.data,
+      context: {
+        ...(input.context || {}),
+        delegatedBy: this.name,
+      },
+      conversationId: input.conversationId || this._conversationId || `delegation-${Date.now()}`,
+    };
+
+    return await this._registry.invoke(agentName, fullInput);
+  }
+
+  // --- Lifecycle hooks (override in subclasses) ---
+
+  async onBeforeRun(_input: AgentInput<TIntent>): Promise<void> {}
+
+  async onStepComplete(_step: WorkflowStep): Promise<void> {}
+
+  async onComplete(_result: AgentResult): Promise<void> {}
+
+  async onError(_error: Error): Promise<void> {}
+
+  // --- Private helpers ---
+
+  /**
+   * Build the `AssemblerOptions` used for this call to `assemblePrompt`.
+   *
+   * Merges any subclass-provided `assemblerOptions.agentAliases` with platform-bot
+   * identities discovered on configured channels (e.g. `SlackChannel.botUserId`,
+   * `TelegramChannel.botUserId`). Read lazily on each `run()` so that identities
+   * populated asynchronously by each channel's startup self-check are picked up
+   * without a race.
+   */
+  private _resolveAssemblerOptions(): AssemblerOptions | undefined {
+    const channelAliases = this.channels
+      .map(c => (c as { botUserId?: string }).botUserId)
+      .filter((x): x is string => typeof x === 'string' && x.length > 0);
+
+    const manualAliases = this.assemblerOptions?.agentAliases ?? [];
+
+    if (channelAliases.length === 0 && manualAliases.length === 0) {
+      return this.assemblerOptions;
+    }
+
+    const merged = Array.from(new Set([...manualAliases, ...channelAliases]));
+    return { ...this.assemblerOptions, agentAliases: merged };
+  }
+
+  /**
+   * Returns the effective interceptor list for a channel binding. Prepends
+   * `createCaptureInterceptor` automatically so every inbound message and
+   * agent reply is persisted without manual wiring. The `CAPTURE_INTERCEPTOR_MARKER`
+   * check prevents double-registration if the developer already added one.
+   */
+  private _getEffectiveInterceptors(): Interceptor[] {
+    const alreadyHasCapture = this.interceptors.some(
+      i => (i as unknown as Record<symbol, unknown>)[CAPTURE_INTERCEPTOR_MARKER] === true
+    );
+    if (alreadyHasCapture) return this.interceptors;
+    return [
+      createCaptureInterceptor({ store: this.conversationHistory }),
+      ...this.interceptors,
+    ];
+  }
+
+  /**
+   * Bind a message handler to a channel.
+   * Extracted here so both standalone start() and AgentRegistry can reuse the same logic.
+   */
+
+  private _bindChannel(channel: ChannelInterface): void {
+    channel.onMessage(async (input: AgentInput) => {
+      if (!input.conversationId) {
+        console.warn(`[${this.name}] Message received without conversationId — skipping`);
+        return;
+      }
+
+      const releaseLock = await this._acquireConversationLock(input.conversationId);
+      let detachStepUpdates: () => void = () => {};
+
+      try {
+        this._triggeringChannel = channel.name;
+        this._isTriggerChannel = channel.isTriggerChannel;
+        this._conversationId = input.conversationId;
+
+        detachStepUpdates = this._attachWorkflowStepUpdates(channel, input);
+
+        const chain = composeChain(
+          this._getEffectiveInterceptors(),
+          this, channel, this._registry ?? null
+        );
+        const chainResult = await executeChain(chain, input);
+        if (chainResult === null) return;
+        const result: AgentOutput = { output: chainResult.output, metadata: chainResult.metadata };
+
+        await channel.send({
+          output: result.output,
+          metadata: {
+            ...result.metadata,
+            conversationId: input.conversationId,
+            ...input.context,
+          },
+        });
+      } catch (error) {
+        const errorMessage = error instanceof Error ? error.message : 'Unknown error occurred';
+        console.error(`[${this.name}] Error in agent invocation: ${errorMessage}`);
+        try {
+          await channel.send({
+            output: `Error: ${errorMessage}`,
+            metadata: {
+              conversationId: input.conversationId,
+              error: true,
+              ...input.context,
+            },
+          });
+        } catch (sendError) {
+          console.error(`[${this.name}] Failed to send error to channel: ${sendError}`);
+        }
+      } finally {
+        detachStepUpdates();
+        releaseLock();
+      }
+    });
+  }
+
+  private _attachWorkflowStepUpdates(channel: ChannelInterface, input: AgentInput): () => void {
+    // Trigger channels have no human recipient, so skip step-by-step sends.
+    if (channel.isTriggerChannel) {
+      return () => {};
+    }
+
+    const planIds = new Set<string>();
+    const sentStepIds = new Set<string>();
+
+    const onPlanCreated = (plan: any) => {
+      if (plan?.id) {
+        planIds.add(String(plan.id));
+      }
+    };
+
+    const onStepComplete = (step: any, plan: any) => {
+      if (!plan?.id || !planIds.has(String(plan.id))) return;
+      if (!step?.result?.output || typeof step.result.output !== 'string') return;
+      if (plan?.steps?.length && Number(plan.steps.length) <= 1) return;
+
+      const stepId = `${String(plan.id)}:${String(step.id ?? step.number ?? 'unknown')}`;
+      if (sentStepIds.has(stepId)) return;
+      sentStepIds.add(stepId);
+
+      const rawOutput = step.result.output.trim();
+      if (!rawOutput) return;
+
+      const output = rawOutput.length > 3500
+        ? `${rawOutput.slice(0, 3500)}\n... [truncated]`
+        : rawOutput;
+
+      const prefix = `Step ${step.number}: ${step.description || 'Completed'}`;
+
+      void channel.send({
+        output: `${prefix}\n\n${output}`,
+        metadata: {
+          conversationId: input.conversationId,
+          ...input.context,
+        },
+      }).catch(err => {
+        const msg = err instanceof Error ? err.message : String(err);
+        console.warn(`[${this.name}] Failed to send workflow step update: ${msg}`);
+      });
+    };
+
+    this.toolpack.on('workflow:plan_created', onPlanCreated);
+    this.toolpack.on('workflow:step_complete', onStepComplete);
+
+    return () => {
+      this.toolpack.off('workflow:plan_created', onPlanCreated);
+      this.toolpack.off('workflow:step_complete', onStepComplete);
+    };
+  }
+
+  private async _acquireConversationLock(conversationId: string): Promise<() => void> {
+    while (this._conversationLocks.has(conversationId)) {
+      try {
+        await this._conversationLocks.get(conversationId);
+      } catch {
+        // Previous lock holder failed — proceed
+      }
+    }
+
+    let releaseLock!: () => void;
+    const lock = new Promise<void>(resolve => { releaseLock = resolve; });
+    this._conversationLocks.set(conversationId, lock);
+
+    return () => {
+      this._conversationLocks.delete(conversationId);
+      releaseLock();
+    };
+  }
+
+  private extractSteps(result: unknown): WorkflowStep[] | undefined {
+    const r = result as Record<string, unknown>;
+
+    if (r.plan && typeof r.plan === 'object') {
+      const plan = r.plan as Record<string, unknown>;
+      if (Array.isArray(plan.steps)) {
+        return plan.steps.map((step: Record<string, unknown>) => ({
+          number: (step.number as number) || 0,
+          description: (step.description as string) || '',
+          status: (step.status as WorkflowStep['status']) || 'completed',
+          result: step.result as WorkflowStep['result'],
+        }));
+      }
+    }
+
+    if (Array.isArray(r.steps)) {
+      return r.steps as WorkflowStep[];
+    }
+
+    return undefined;
+  }
+}
+
+// Agent event types for TypeScript users
+export interface AgentEvents {
+  'agent:start': (input: AgentInput) => void;
+  'agent:step': (step: WorkflowStep) => void;
+  'agent:complete': (result: AgentResult) => void;
+  'agent:error': (error: Error) => void;
+}
diff --git a/packages/toolpack-agents/src/agent/errors.ts b/packages/toolpack-agents/src/agent/errors.ts
new file mode 100644
index 0000000..0893737
--- /dev/null
+++ b/packages/toolpack-agents/src/agent/errors.ts
@@ -0,0 +1,9 @@
+/**
+ * Custom error class for agent-related errors.
+ */
+export class AgentError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'AgentError';
+  }
+}
diff --git a/packages/toolpack-agents/src/agent/types.test.ts b/packages/toolpack-agents/src/agent/types.test.ts
new file mode 100644
index 0000000..58c955d
--- /dev/null
+++ b/packages/toolpack-agents/src/agent/types.test.ts
@@ -0,0 +1,180 @@
+import { describe, it, expect } from 'vitest';
+import type {
+  AgentInput,
+  AgentResult,
+  AgentOutput,
+  AgentRunOptions,
+  WorkflowStep,
+  IAgentRegistry,
+  AgentInstance,
+  ChannelInterface,
+} from './types.js';
+
+describe('Agent Types', () => {
+  describe('AgentInput', () => {
+    it('should create a valid AgentInput', () => {
+      const input: AgentInput = {
+        intent: 'test_intent',
+        message: 'Hello agent',
+        data: { key: 'value' },
+        context: { user: 'test' },
+        conversationId: 'thread-123',
+      };
+
+      expect(input.intent).toBe('test_intent');
+      expect(input.message).toBe('Hello agent');
+      expect(input.conversationId).toBe('thread-123');
+    });
+
+    it('should create a minimal AgentInput', () => {
+      const input: AgentInput = {
+        message: 'Test',
+      };
+
+      expect(input.message).toBe('Test');
+    });
+
+    it('should support typed intents', () => {
+      type TestIntent = 'intent_a' | 'intent_b';
+      const input: AgentInput<TestIntent> = {
+        intent: 'intent_a',
+        message: 'Test',
+      };
+
+      expect(input.intent).toBe('intent_a');
+    });
+  });
+
+  describe('AgentResult', () => {
+    it('should create a valid AgentResult', () => {
+      const result: AgentResult = {
+        output: 'Response from agent',
+        steps: [
+          {
+            number: 1,
+            description: 'Step 1',
+            status: 'completed',
+          },
+        ],
+        metadata: { key: 'value' },
+      };
+
+      expect(result.output).toBe('Response from agent');
+      expect(result.steps).toHaveLength(1);
+      expect(result.metadata).toEqual({ key: 'value' });
+    });
+
+    it('should create a minimal AgentResult', () => {
+      const result: AgentResult = {
+        output: 'Simple response',
+      };
+
+      expect(result.output).toBe('Simple response');
+    });
+  });
+
+  describe('AgentOutput', () => {
+    it('should create a valid AgentOutput', () => {
+      const output: AgentOutput = {
+        output: 'Channel message',
+        metadata: { chatId: 12345 },
+      };
+
+      expect(output.output).toBe('Channel message');
+      expect(output.metadata).toEqual({ chatId: 12345 });
+    });
+  });
+
+  describe('WorkflowStep', () => {
+    it('should create a valid WorkflowStep', () => {
+      const step: WorkflowStep = {
+        number: 1,
+        description: 'Process data',
+        status: 'completed',
+        result: {
+          success: true,
+          output: 'Data processed',
+          toolsUsed: ['tool1'],
+          duration: 1000,
+        },
+      };
+
+      expect(step.number).toBe(1);
+      expect(step.description).toBe('Process data');
+      expect(step.status).toBe('completed');
+      expect(step.result?.success).toBe(true);
+    });
+
+    it('should support all status values', () => {
+      const statuses: WorkflowStep['status'][] = [
+        'pending',
+        'in_progress',
+        'completed',
+        'failed',
+        'skipped',
+      ];
+
+      for (const status of statuses) {
+        const step: WorkflowStep = {
+          number: 1,
+          description: 'Test',
+          status,
+        };
+        expect(step.status).toBe(status);
+      }
+    });
+  });
+
+  describe('IAgentRegistry', () => {
+    it('should define IAgentRegistry structure', () => {
+      const mockRegistry: IAgentRegistry = {
+        start: async () => {},
+        stop: async () => {},
+        sendTo: async () => {},
+        getAgent: () => undefined,
+        getAllAgents: () => [],
+        getChannel: () => undefined,
+        invoke: async () => ({ output: '' }),
+        getPendingAsk: () => undefined,
+        addPendingAsk: (ask) => ({ ...ask, id: 'test', askedAt: new Date(), retries: 0, status: 'pending' }),
+        resolvePendingAsk: async () => {},
+        hasPendingAsks: () => false,
+        incrementRetries: () => undefined,
+        cleanupExpiredAsks: () => 0,
+      };
+
+      expect(mockRegistry.start).toBeDefined();
+      expect(mockRegistry.sendTo).toBeDefined();
+      expect(mockRegistry.invoke).toBeDefined();
+    });
+  });
+
+  describe('AgentInstance', () => {
+    it('should define AgentInstance structure', () => {
+      // Type-only test
+      type TestInstance = AgentInstance<'test'>;
+      expect(true).toBe(true);
+    });
+  });
+
+  describe('ChannelInterface', () => {
+    it('should define ChannelInterface structure', () => {
+      // Create a mock implementation
+      const mockChannel: ChannelInterface = {
+        name: 'test-channel',
+        listen: () => {},
+        send: async () => {},
+        normalize: (incoming) => ({
+          message: String(incoming),
+        }),
+        onMessage: () => {},
+      };
+
+      expect(mockChannel.name).toBe('test-channel');
+      expect(mockChannel.listen).toBeDefined();
+      expect(mockChannel.send).toBeDefined();
+      expect(mockChannel.normalize).toBeDefined();
+      expect(mockChannel.onMessage).toBeDefined();
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/agent/types.ts b/packages/toolpack-agents/src/agent/types.ts
new file mode 100644
index 0000000..8a93464
--- /dev/null
+++ b/packages/toolpack-agents/src/agent/types.ts
@@ -0,0 +1,352 @@
+import type { Toolpack, Participant, ModeConfig } from 'toolpack-sdk';
+import type { EventEmitter } from 'events';
+import type { Interceptor } from '../interceptors/types.js';
+
+export type { Participant };
+
+/**
+ * Options for constructing a BaseAgent.
+ *
+ * - `{ apiKey, provider?, model? }` — agent creates and owns its own Toolpack instance.
+ *   The instance is initialised lazily in `start()`.
+ * - `{ toolpack }` — agent uses a shared Toolpack instance (e.g. passed from AgentRegistry
+ *   for multi-agent setups where API client and config are shared).
+ */
+export type BaseAgentOptions =
+  | { apiKey: string; provider?: string; model?: string }
+  | { toolpack: Toolpack };
+
+
+/**
+ * Input structure for agent invocation.
+ * Channels normalize external events into this format.
+ */
+export interface AgentInput<TIntent extends string = string> {
+  /** Typed intent for routing decisions - compile-time safe when using generics */
+  intent?: TIntent;
+
+  /** Natural language message from the user */
+  message?: string;
+
+  /** Structured payload from the channel */
+  data?: unknown;
+
+  /** Additional context for the agent */
+  context?: Record<string, unknown>;
+
+  /** Channel-agnostic thread/session identifier for conversation continuity */
+  conversationId?: string;
+
+  /**
+   * The participant who produced this message, as populated by the channel
+   * during `normalize()` or resolved later via `channel.resolveParticipant`.
+   * Interceptors such as `participant-resolver` read and/or enrich this.
+   */
+  participant?: Participant;
+}
+
+/**
+ * Represents a step in a workflow execution.
+ * This is a simplified interface that captures essential step information.
+ */
+export interface WorkflowStep {
+  /** Step number (1-indexed) */
+  number: number;
+
+  /** Human-readable description of the step */
+  description: string;
+
+  /** Step execution status */
+  status: 'pending' | 'in_progress' | 'completed' | 'failed' | 'skipped';
+
+  /** Result after completion (if available) */
+  result?: {
+    success: boolean;
+    output?: string;
+    error?: string;
+    toolsUsed?: string[];
+    duration?: number;
+  };
+}
+
+/**
+ * Result structure returned by agents.
+ */
+export interface AgentResult {
+  /** The agent's response/output */
+  output: string;
+
+  /** Workflow steps taken during execution (populated by run()) */
+  steps?: WorkflowStep[];
+
+  /** Optional metadata for routing decisions or post-processing */
+  metadata?: Record<string, unknown>;
+}
+
+/**
+ * Output structure sent to channels.
+ */
+export interface AgentOutput {
+  output: string;
+  metadata?: Record<string, unknown>;
+}
+
+/**
+ * Options for a single agent run.
+ */
+export interface AgentRunOptions {
+  /** One-off workflow override for this specific run */
+  workflow?: Record<string, unknown>;
+}
+
+/**
+ * Agent instance interface - shape of a BaseAgent instance.
+ * This represents the public API surface of any agent.
+ */
+export interface AgentInstance<TIntent extends string = string> extends EventEmitter {
+  /** Unique name of the agent */
+  name: string;
+
+  /** Human-readable description of the agent's purpose */
+  description: string;
+
+  /** LLM mode used by this agent (full ModeConfig or a registered mode name) */
+  mode: ModeConfig | string;
+
+  /** Channels this agent listens on and sends responses to */
+  channels: ChannelInterface[];
+
+  /** Interceptors applied to every inbound message before invokeAgent is called */
+  interceptors: Interceptor[];
+
+  /**
+   * Main entry point for agent execution.
+   * @param input The input containing message, intent, context, etc.
+   * @returns The agent's result including output and metadata
+   */
+  invokeAgent(input: AgentInput<TIntent>): Promise<AgentResult>;
+
+  /**
+   * Start the agent: initialise Toolpack (if not provided), bind message handlers
+   * to all configured channels, and begin listening.
+   */
+  start(): Promise<void>;
+
+  /** Stop all channels and release owned resources. */
+  stop(): Promise<void>;
+
+  /**
+   * Ensure the internal Toolpack instance is ready.
+   * Called by AgentRegistry before start() so the toolpack is available
+   * when _registry is set.
+   */
+  _ensureToolpack(): Promise<void>;
+
+  /** Internal reference to the agent registry (set before start() by AgentRegistry) */
+  _registry?: IAgentRegistry;
+
+  /** Name of the channel that triggered this agent */
+  _triggeringChannel?: string;
+
+  /** Conversation ID for maintaining context across interactions */
+  _conversationId?: string;
+
+  /** Whether the triggering channel is a trigger channel (no human recipient) */
+  _isTriggerChannel?: boolean;
+}
+
+/**
+ * Channel interface for connecting agents to external systems.
+ * Channels normalize incoming messages to AgentInput and send AgentOutput back.
+ */
+export interface ChannelInterface {
+  /** Optional channel name for identification */
+  name?: string;
+
+  /**
+   * Whether this is a trigger channel (no human recipient).
+   * Trigger channels cannot use ask() - they must be fire-and-forget.
+   */
+  isTriggerChannel: boolean;
+
+  /**
+   * Start listening for incoming messages.
+   * Called by AgentRegistry when the system starts.
+   */
+  listen(): void;
+
+  /**
+   * Send output back to the external system.
+   * @param output The output to send
+   */
+  send(output: AgentOutput): Promise<void>;
+
+  /**
+   * Normalize raw incoming data to AgentInput format.
+   * @param incoming Raw data from the external system
+   * @returns Normalized AgentInput
+   */
+  normalize(incoming: unknown): AgentInput;
+
+  /**
+   * Register a handler for incoming messages.
+   * @param handler Function to process incoming AgentInput
+   */
+  onMessage(handler: (input: AgentInput) => Promise<void>): void;
+
+  /**
+   * Optional hook to resolve richer `Participant` details (e.g. display name)
+   * for a normalized input.
+   *
+   * Design:
+   * - **Lazy.** Called at render/interceptor time, not during `normalize()`,
+   *   so capture stays cheap.
+   * - **Cacheable.** Implementations should cache per-process and invalidate
+   *   on explicit platform signals (e.g. Slack `user_change`).
+   * - **Fallback-safe.** If resolution fails, return `undefined` so the
+   *   pipeline can fall back to the id. Must never throw on miss.
+   *
+   * The returned participant is merged into `input.participant` by the
+   * `participant-resolver` interceptor. If the channel cannot resolve
+   * anything, it should return `undefined`.
+   */
+  resolveParticipant?(input: AgentInput): Promise<Participant | undefined> | Participant | undefined;
+}
+
+/**
+ * Alias for ChannelInterface to match spec naming convention.
+ * @deprecated Use ChannelInterface for new code
+ */
+export type BaseChannel = ChannelInterface;
+
+/**
+ * Represents a pending human-in-the-loop question.
+ * Stored in-memory in PendingAsksStore (inside AgentRegistry).
+ */
+export interface PendingAsk {
+  /** Unique identifier for this ask */
+  id: string;
+
+  /** Ties ask to the conversation thread */
+  conversationId: string;
+
+  /** Agent that created this ask */
+  agentName: string;
+
+  /** The question sent to the human */
+  question: string;
+
+  /** Developer-stored state needed to continue */
+  context: Record<string, unknown>;
+
+  /** Current status of the ask */
+  status: 'pending' | 'answered' | 'expired';
+
+  /** The human's answer (if status is 'answered') */
+  answer?: string;
+
+  /** Number of times this ask has been retried */
+  retries: number;
+
+  /** Maximum retry attempts before giving up */
+  maxRetries: number;
+
+  /** When the ask was created */
+  askedAt: Date;
+
+  /** Optional expiration time */
+  expiresAt?: Date;
+
+  /** Channel name to send follow-up questions to (required for auto-send) */
+  channelName: string;
+}
+
+/**
+ * Interface for the AgentRegistry.
+ * Manages agent instances, channels, pending asks, and agent-to-agent communication.
+ */
+export interface IAgentRegistry {
+  /**
+   * Start all registered agents and their channels.
+   * Each agent initialises its own Toolpack instance (or uses the shared one it was
+   * constructed with) before channels begin listening.
+   */
+  start(): Promise<void>;
+
+  /**
+   * Send output to a specific channel by name.
+   * @param channelName The name of the channel to send to
+   * @param output The output to send
+   */
+  sendTo(channelName: string, output: AgentOutput): Promise<void>;
+
+  /**
+   * Get an agent instance by name.
+   * @param name The agent name
+   * @returns The agent instance or undefined if not found
+   */
+  getAgent(name: string): AgentInstance | undefined;
+
+  /**
+   * Get all registered agent instances.
+   * @returns Array of all agent instances
+   */
+  getAllAgents(): AgentInstance[];
+
+  /**
+   * Get a registered channel by name.
+   * @param name The channel name
+   * @returns The channel interface or undefined if not found
+   */
+  getChannel(name: string): ChannelInterface | undefined;
+
+  /**
+   * Invoke an agent by name through the transport layer.
+   * Used internally by delegate() and delegateAndWait() on BaseAgent.
+   * @param agentName The target agent's name
+   * @param input The invocation input
+   * @returns The agent's result
+   */
+  invoke(agentName: string, input: AgentInput): Promise<AgentResult>;
+
+  /**
+   * Get a pending ask for a conversation.
+   * @param conversationId The conversation ID
+   * @returns The pending ask or undefined
+   */
+  getPendingAsk(conversationId: string): PendingAsk | undefined;
+
+  /**
+   * Add a new pending ask to the store.
+   * @param ask The ask data (without auto-generated fields)
+   * @returns The created PendingAsk with generated fields
+   */
+  addPendingAsk(ask: Omit<PendingAsk, 'id' | 'askedAt' | 'retries' | 'status'>): PendingAsk;
+
+  /**
+   * Resolve a pending ask with an answer.
+   * @param id The ask ID
+   * @param answer The human's answer
+   */
+  resolvePendingAsk(id: string, answer: string): Promise<void>;
+
+  /**
+   * Check if a conversation has pending asks.
+   * @param conversationId The conversation ID
+   * @returns True if there are pending asks
+   */
+  hasPendingAsks(conversationId: string): boolean;
+
+  /**
+   * Increment the retry count for a pending ask.
+   * @param id The ask ID
+   * @returns The new retry count or undefined if ask not found
+   */
+  incrementRetries(id: string): number | undefined;
+
+  /**
+   * Clean up expired pending asks.
+   * @returns Number of asks cleaned up
+   */
+  cleanupExpiredAsks(): number;
+}
diff --git a/packages/toolpack-agents/src/agents/browser-agent.test.ts b/packages/toolpack-agents/src/agents/browser-agent.test.ts
new file mode 100644
index 0000000..ebc3d0a
--- /dev/null
+++ b/packages/toolpack-agents/src/agents/browser-agent.test.ts
@@ -0,0 +1,58 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { BrowserAgent } from './browser-agent.js';
+import type { Toolpack } from 'toolpack-sdk';
+
+const createMockToolpack = () => {
+  return {
+    generate: vi.fn().mockResolvedValue({
+      content: 'Form filled successfully',
+      usage: { prompt_tokens: 80, completion_tokens: 40, total_tokens: 120 },
+    }),
+    setMode: vi.fn(),
+    registerMode: vi.fn(),
+  } as unknown as Toolpack;
+};
+
+describe('BrowserAgent', () => {
+  let mockToolpack: Toolpack;
+  let agent: BrowserAgent;
+
+  beforeEach(() => {
+    mockToolpack = createMockToolpack();
+    agent = new BrowserAgent({ toolpack: mockToolpack });
+  });
+
+  it('should have correct configuration', () => {
+    expect(agent.name).toBe('browser-agent');
+    expect(agent.description).toContain('Browser');
+    expect(agent.mode.name).toBe('browser-agent-mode');
+  });
+
+  it('should have browser-focused system prompt', () => {
+    expect(agent.mode.systemPrompt).toContain('browser');
+    expect(agent.mode.systemPrompt).toContain('web.fetch');
+    expect(agent.mode.systemPrompt).toContain('extraction');
+  });
+
+  it('should invoke agent with browser task', async () => {
+    const input = {
+      message: 'Fill in the contact form at acme.com/contact',
+    };
+
+    const result = await agent.invokeAgent(input);
+
+    expect(mockToolpack.setMode).toHaveBeenCalledWith('browser-agent-mode');
+    expect(result).toBeDefined();
+    expect(result.output).toBeDefined();
+  });
+
+  it('should handle empty message', async () => {
+    const input = {
+      message: undefined,
+    };
+
+    const result = await agent.invokeAgent(input);
+
+    expect(result).toBeDefined();
+  });
+});
diff --git a/packages/toolpack-agents/src/agents/browser-agent.ts b/packages/toolpack-agents/src/agents/browser-agent.ts
new file mode 100644
index 0000000..3fd051b
--- /dev/null
+++ b/packages/toolpack-agents/src/agents/browser-agent.ts
@@ -0,0 +1,44 @@
+import { BaseAgentOptions } from './../agent/types.js';
+import { BaseAgent } from '../agent/base-agent.js';
+import { AgentInput, AgentResult } from '../agent/types.js';
+import { CHAT_MODE, type ModeConfig } from 'toolpack-sdk';
+
+/**
+ * Built-in browser agent for web interaction tasks.
+ * Handles web browsing, form interaction, page extraction, and link following.
+ *
+ * @example
+ * ```ts
+ * const browserAgent = new BrowserAgent(toolpack);
+ * const result = await browserAgent.invokeAgent({
+ *   message: 'Extract all product prices from example.com/products'
+ * });
+ * ```
+ */
+const BROWSER_AGENT_MODE: ModeConfig = {
+  ...CHAT_MODE,
+  name: 'browser-agent-mode',
+  systemPrompt: [
+    'You are a browser agent specialized in web interaction and content extraction.',
+    'Use web.fetch to retrieve pages, web.screenshot for visual content, and web.extract_links for navigation.',
+    'Follow links intelligently to gather comprehensive information.',
+    'Extract structured data from web pages when possible.',
+    'Be mindful of rate limits and respectful of website resources.',
+  ].join(' '),
+};
+
+export class BrowserAgent extends BaseAgent {
+  name = 'browser-agent';
+  description = 'Browser agent for web browsing, form interaction, page extraction, and link following';
+  mode = BROWSER_AGENT_MODE;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    const result = await this.run(input.message || '', undefined, { conversationId: input.conversationId });
+    await this.onComplete(result);
+    return result;
+  }
+}
diff --git a/packages/toolpack-agents/src/agents/coding-agent.test.ts b/packages/toolpack-agents/src/agents/coding-agent.test.ts
new file mode 100644
index 0000000..57ca056
--- /dev/null
+++ b/packages/toolpack-agents/src/agents/coding-agent.test.ts
@@ -0,0 +1,58 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { CodingAgent } from './coding-agent.js';
+import type { Toolpack } from 'toolpack-sdk';
+
+const createMockToolpack = () => {
+  return {
+    generate: vi.fn().mockResolvedValue({
+      content: 'Code changes completed successfully',
+      usage: { prompt_tokens: 150, completion_tokens: 75, total_tokens: 225 },
+    }),
+    setMode: vi.fn(),
+    registerMode: vi.fn(),
+  } as unknown as Toolpack;
+};
+
+describe('CodingAgent', () => {
+  let mockToolpack: Toolpack;
+  let agent: CodingAgent;
+
+  beforeEach(() => {
+    mockToolpack = createMockToolpack();
+    agent = new CodingAgent({ toolpack: mockToolpack });
+  });
+
+  it('should have correct configuration', () => {
+    expect(agent.name).toBe('coding-agent');
+    expect(agent.description).toContain('Coding');
+    expect(agent.mode.name).toBe('coding-agent-mode');
+  });
+
+  it('should have coding-focused system prompt', () => {
+    expect(agent.mode.systemPrompt).toContain('coding');
+    expect(agent.mode.systemPrompt).toContain('coding.*');
+    expect(agent.mode.systemPrompt).toContain('best practices');
+  });
+
+  it('should invoke agent with coding task', async () => {
+    const input = {
+      message: 'Refactor the auth module to use the new SDK pattern',
+    };
+
+    const result = await agent.invokeAgent(input);
+
+    expect(mockToolpack.setMode).toHaveBeenCalledWith('coding-agent-mode');
+    expect(result).toBeDefined();
+    expect(result.output).toBeDefined();
+  });
+
+  it('should handle empty message', async () => {
+    const input = {
+      message: undefined,
+    };
+
+    const result = await agent.invokeAgent(input);
+
+    expect(result).toBeDefined();
+  });
+});
diff --git a/packages/toolpack-agents/src/agents/coding-agent.ts b/packages/toolpack-agents/src/agents/coding-agent.ts
new file mode 100644
index 0000000..d97b2a4
--- /dev/null
+++ b/packages/toolpack-agents/src/agents/coding-agent.ts
@@ -0,0 +1,44 @@
+import { BaseAgentOptions } from './../agent/types.js';
+import { BaseAgent } from '../agent/base-agent.js';
+import { AgentInput, AgentResult } from '../agent/types.js';
+import { CODING_MODE, type ModeConfig } from 'toolpack-sdk';
+
+/**
+ * Built-in coding agent for software development tasks.
+ * Handles code generation, refactoring, debugging, test writing, and code review.
+ *
+ * @example
+ * ```ts
+ * const codingAgent = new CodingAgent(toolpack);
+ * const result = await codingAgent.invokeAgent({
+ *   message: 'Refactor this function to use async/await'
+ * });
+ * ```
+ */
+const CODING_AGENT_MODE: ModeConfig = {
+  ...CODING_MODE,
+  name: 'coding-agent-mode',
+  systemPrompt: [
+    'You are a coding agent specialized in software development tasks.',
+    'Use coding.* tools for code analysis, fs.* for file operations, and git.* for version control.',
+    'Write clean, idiomatic code following best practices.',
+    'Always verify your changes and check for potential issues.',
+    'Provide clear explanations of your code changes.',
+  ].join(' '),
+};
+
+export class CodingAgent extends BaseAgent {
+  name = 'coding-agent';
+  description = 'Coding agent for code generation, refactoring, debugging, test writing, and code review';
+  mode = CODING_AGENT_MODE;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    const result = await this.run(input.message || '', undefined, { conversationId: input.conversationId });
+    await this.onComplete(result);
+    return result;
+  }
+}
diff --git a/packages/toolpack-agents/src/agents/data-agent.test.ts b/packages/toolpack-agents/src/agents/data-agent.test.ts
new file mode 100644
index 0000000..9cf1f26
--- /dev/null
+++ b/packages/toolpack-agents/src/agents/data-agent.test.ts
@@ -0,0 +1,58 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { DataAgent } from './data-agent.js';
+import type { Toolpack } from 'toolpack-sdk';
+
+const createMockToolpack = () => {
+  return {
+    generate: vi.fn().mockResolvedValue({
+      content: 'Weekly signup summary generated',
+      usage: { prompt_tokens: 120, completion_tokens: 60, total_tokens: 180 },
+    }),
+    setMode: vi.fn(),
+    registerMode: vi.fn(),
+  } as unknown as Toolpack;
+};
+
+describe('DataAgent', () => {
+  let mockToolpack: Toolpack;
+  let agent: DataAgent;
+
+  beforeEach(() => {
+    mockToolpack = createMockToolpack();
+    agent = new DataAgent({ toolpack: mockToolpack });
+  });
+
+  it('should have correct configuration', () => {
+    expect(agent.name).toBe('data-agent');
+    expect(agent.description).toContain('data');
+    expect(agent.mode.name).toBe('data-agent-mode');
+  });
+
+  it('should have data-focused system prompt', () => {
+    expect(agent.mode.systemPrompt).toContain('data');
+    expect(agent.mode.systemPrompt).toContain('db.*');
+    expect(agent.mode.systemPrompt).toContain('analysis');
+  });
+
+  it('should invoke agent with data task', async () => {
+    const input = {
+      message: 'Generate a weekly summary of signups by region',
+    };
+
+    const result = await agent.invokeAgent(input);
+
+    expect(mockToolpack.setMode).toHaveBeenCalledWith('data-agent-mode');
+    expect(result).toBeDefined();
+    expect(result.output).toBeDefined();
+  });
+
+  it('should handle empty message', async () => {
+    const input = {
+      message: undefined,
+    };
+
+    const result = await agent.invokeAgent(input);
+
+    expect(result).toBeDefined();
+  });
+});
diff --git a/packages/toolpack-agents/src/agents/data-agent.ts b/packages/toolpack-agents/src/agents/data-agent.ts
new file mode 100644
index 0000000..7fe26d7
--- /dev/null
+++ b/packages/toolpack-agents/src/agents/data-agent.ts
@@ -0,0 +1,44 @@
+import { BaseAgentOptions } from './../agent/types.js';
+import { BaseAgent } from '../agent/base-agent.js';
+import { AgentInput, AgentResult } from '../agent/types.js';
+import { AGENT_MODE, type ModeConfig } from 'toolpack-sdk';
+
+/**
+ * Built-in data agent for database and data analysis tasks.
+ * Handles database queries, CSV generation, data analysis, reporting, and aggregation.
+ *
+ * @example
+ * ```ts
+ * const dataAgent = new DataAgent(toolpack);
+ * const result = await dataAgent.invokeAgent({
+ *   message: 'Generate a monthly sales report from the orders table'
+ * });
+ * ```
+ */
+const DATA_AGENT_MODE: ModeConfig = {
+  ...AGENT_MODE,
+  name: 'data-agent-mode',
+  systemPrompt: [
+    'You are a data agent specialized in database operations and data analysis.',
+    'Use db.* tools for database queries, fs.* for file operations, and http.* for API requests.',
+    'Generate clear, well-formatted reports and summaries.',
+    'Always validate data integrity and handle errors gracefully.',
+    'Provide insights and patterns when analyzing data.',
+  ].join(' '),
+};
+
+export class DataAgent extends BaseAgent {
+  name = 'data-agent';
+  description = 'Data agent for database queries, CSV generation, data analysis, reporting, and aggregation';
+  mode = DATA_AGENT_MODE;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    const result = await this.run(input.message || '', undefined, { conversationId: input.conversationId });
+    await this.onComplete(result);
+    return result;
+  }
+}
diff --git a/packages/toolpack-agents/src/agents/index.ts b/packages/toolpack-agents/src/agents/index.ts
new file mode 100644
index 0000000..91b0426
--- /dev/null
+++ b/packages/toolpack-agents/src/agents/index.ts
@@ -0,0 +1,4 @@
+export { ResearchAgent } from './research-agent.js';
+export { CodingAgent } from './coding-agent.js';
+export { DataAgent } from './data-agent.js';
+export { BrowserAgent } from './browser-agent.js';
diff --git a/packages/toolpack-agents/src/agents/research-agent.test.ts b/packages/toolpack-agents/src/agents/research-agent.test.ts
new file mode 100644
index 0000000..271a5e2
--- /dev/null
+++ b/packages/toolpack-agents/src/agents/research-agent.test.ts
@@ -0,0 +1,58 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { ResearchAgent } from './research-agent.js';
+import type { Toolpack } from 'toolpack-sdk';
+
+const createMockToolpack = () => {
+  return {
+    generate: vi.fn().mockResolvedValue({
+      content: 'Research findings: Edge AI is rapidly evolving...',
+      usage: { prompt_tokens: 100, completion_tokens: 50, total_tokens: 150 },
+    }),
+    setMode: vi.fn(),
+    registerMode: vi.fn(),
+  } as unknown as Toolpack;
+};
+
+describe('ResearchAgent', () => {
+  let mockToolpack: Toolpack;
+  let agent: ResearchAgent;
+
+  beforeEach(() => {
+    mockToolpack = createMockToolpack();
+    agent = new ResearchAgent({ toolpack: mockToolpack });
+  });
+
+  it('should have correct configuration', () => {
+    expect(agent.name).toBe('research-agent');
+    expect(agent.description).toContain('research');
+    expect(agent.mode.name).toBe('research-agent-mode');
+  });
+
+  it('should have research-focused system prompt', () => {
+    expect(agent.mode.systemPrompt).toContain('research');
+    expect(agent.mode.systemPrompt).toContain('web.search');
+    expect(agent.mode.systemPrompt).toContain('sources');
+  });
+
+  it('should invoke agent with message', async () => {
+    const input = {
+      message: 'Research recent developments in edge AI',
+    };
+
+    const result = await agent.invokeAgent(input);
+
+    expect(mockToolpack.setMode).toHaveBeenCalledWith('research-agent-mode');
+    expect(result).toBeDefined();
+    expect(result.output).toBeDefined();
+  });
+
+  it('should handle empty message', async () => {
+    const input = {
+      message: undefined,
+    };
+
+    const result = await agent.invokeAgent(input);
+
+    expect(result).toBeDefined();
+  });
+});
diff --git a/packages/toolpack-agents/src/agents/research-agent.ts b/packages/toolpack-agents/src/agents/research-agent.ts
new file mode 100644
index 0000000..1b38522
--- /dev/null
+++ b/packages/toolpack-agents/src/agents/research-agent.ts
@@ -0,0 +1,44 @@
+import { BaseAgentOptions } from './../agent/types.js';
+import { BaseAgent } from '../agent/base-agent.js';
+import { AgentInput, AgentResult } from '../agent/types.js';
+import { AGENT_MODE, type ModeConfig } from 'toolpack-sdk';
+
+/**
+ * Built-in research agent for web research and information gathering.
+ * Specialized in summarization, fact-finding, competitive analysis, and trend monitoring.
+ *
+ * @example
+ * ```ts
+ * const researchAgent = new ResearchAgent(toolpack);
+ * const result = await researchAgent.invokeAgent({
+ *   message: 'Research latest AI regulations in the EU'
+ * });
+ * ```
+ */
+const RESEARCH_AGENT_MODE: ModeConfig = {
+  ...AGENT_MODE,
+  name: 'research-agent-mode',
+  systemPrompt: [
+    'You are a research agent specialized in web research and information gathering.',
+    'Use web.search to find relevant information, web.fetch to retrieve content, and web.scrape when needed.',
+    'Always cite your sources with URLs.',
+    'Provide comprehensive, well-structured summaries.',
+    'Flag any conflicting information or uncertainty in your findings.',
+  ].join(' '),
+};
+
+export class ResearchAgent extends BaseAgent {
+  name = 'research-agent';
+  description = 'Web research agent for summarization, fact-finding, competitive analysis, and trend monitoring';
+  mode = RESEARCH_AGENT_MODE;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    const result = await this.run(input.message || '', undefined, { conversationId: input.conversationId });
+    await this.onComplete(result);
+    return result;
+  }
+}
diff --git a/packages/toolpack-agents/src/capabilities/index.ts b/packages/toolpack-agents/src/capabilities/index.ts
new file mode 100644
index 0000000..ee9f027
--- /dev/null
+++ b/packages/toolpack-agents/src/capabilities/index.ts
@@ -0,0 +1,16 @@
+// Capability agents - reusable agents for cross-cutting concerns
+// These agents have no direct channel exposure and are invoked by interceptors or other agents
+
+export {
+  IntentClassifierAgent,
+  IntentClassifierInput,
+  IntentClassification
+} from './intent-classifier-agent.js';
+
+export {
+  SummarizerAgent,
+  SummarizerInput,
+  SummarizerOutput,
+  HistoryTurn,
+  Participant
+} from './summarizer-agent.js';
diff --git a/packages/toolpack-agents/src/capabilities/intent-classifier-agent.test.ts b/packages/toolpack-agents/src/capabilities/intent-classifier-agent.test.ts
new file mode 100644
index 0000000..6bf26c3
--- /dev/null
+++ b/packages/toolpack-agents/src/capabilities/intent-classifier-agent.test.ts
@@ -0,0 +1,240 @@
+import { describe, it, expect, vi } from 'vitest';
+import { IntentClassifierAgent, IntentClassifierInput, IntentClassification } from './intent-classifier-agent.js';
+import { AgentResult } from '../agent/types.js';
+
+// Mock Toolpack
+function createMockToolpack(generateResult: string) {
+  return {
+    setMode: vi.fn(),
+    registerMode: vi.fn(),
+    generate: vi.fn().mockResolvedValue({
+      content: generateResult,
+      usage: { promptTokens: 50, completionTokens: 10, totalTokens: 60 }
+    })
+  } as unknown as import('toolpack-sdk').Toolpack;
+}
+
+describe('IntentClassifierAgent', () => {
+  describe('DM short-circuit', () => {
+    it('returns direct without LLM call when isDirectMessage is true', async () => {
+      const toolpack = createMockToolpack('passive');
+      const agent = new IntentClassifierAgent({ toolpack });
+
+      const result = await agent.invokeAgent({
+        message: 'classify',
+        data: {
+          message: 'Hello there',
+          agentName: 'assistant',
+          agentId: 'U123',
+          senderName: 'alice',
+          channelName: 'dm-alice',
+          isDirectMessage: true
+        } as IntentClassifierInput
+      });
+
+      expect(result.output).toBe('direct');
+      expect(result.metadata).toEqual({
+        classification: 'direct',
+        shortCircuit: 'dm'
+      });
+      expect(toolpack.generate).not.toHaveBeenCalled();
+    });
+
+    it('short-circuits even when message is empty', async () => {
+      const toolpack = createMockToolpack('ignore');
+      const agent = new IntentClassifierAgent({ toolpack });
+
+      const result = await agent.invokeAgent({
+        message: 'classify',
+        data: {
+          message: '',
+          agentName: 'assistant',
+          agentId: 'U123',
+          senderName: 'alice',
+          channelName: 'dm-alice',
+          isDirectMessage: true
+        } as IntentClassifierInput
+      });
+
+      expect(result.output).toBe('direct');
+      expect(toolpack.generate).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('missing payload', () => {
+    it('returns ignore when no message provided', async () => {
+      const toolpack = createMockToolpack('direct');
+      const agent = new IntentClassifierAgent({ toolpack });
+
+      const result = await agent.invokeAgent({
+        message: 'classify',
+        data: undefined
+      });
+
+      expect(result.output).toBe('ignore');
+      expect(result.metadata).toEqual({ error: 'No message provided for classification' });
+      expect(toolpack.generate).not.toHaveBeenCalled();
+    });
+
+    it('returns ignore when message is empty string', async () => {
+      const toolpack = createMockToolpack('direct');
+      const agent = new IntentClassifierAgent({ toolpack });
+
+      const result = await agent.invokeAgent({
+        message: 'classify',
+        data: {
+          message: '',
+          agentName: 'assistant',
+          agentId: 'U123',
+          senderName: 'alice',
+          channelName: 'general',
+          isDirectMessage: false
+        } as IntentClassifierInput
+      });
+
+      expect(result.output).toBe('ignore');
+      expect(toolpack.generate).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('normalizeClassification', () => {
+    async function testNormalization(
+      llmOutput: string,
+      expected: IntentClassification
+    ): Promise<void> {
+      const toolpack = createMockToolpack(llmOutput);
+      const agent = new IntentClassifierAgent({ toolpack });
+
+      const result = await agent.invokeAgent({
+        message: 'classify',
+        data: {
+          message: 'test message',
+          agentName: 'assistant',
+          agentId: 'U123',
+          senderName: 'bob',
+          channelName: 'general',
+          isDirectMessage: false
+        } as IntentClassifierInput
+      });
+
+      expect(result.output).toBe(expected);
+    }
+
+    describe('exact first-word matches', () => {
+      it('normalizes "direct" to direct', async () => {
+        await testNormalization('direct', 'direct');
+      });
+
+      it('normalizes "indirect" to indirect', async () => {
+        await testNormalization('indirect', 'indirect');
+      });
+
+      it('normalizes "passive" to passive', async () => {
+        await testNormalization('passive', 'passive');
+      });
+
+      it('normalizes "ignore" to ignore', async () => {
+        await testNormalization('ignore', 'ignore');
+      });
+
+      it('handles uppercase first word', async () => {
+        await testNormalization('Direct', 'direct');
+      });
+
+      it('handles mixed case first word', async () => {
+        await testNormalization('InDiReCt', 'indirect');
+      });
+    });
+
+    describe('first word with trailing text', () => {
+      it('extracts direct from "direct - clearly addressing the agent"', async () => {
+        await testNormalization('direct - clearly addressing the agent', 'direct');
+      });
+
+      it('extracts indirect from "indirect, the user is mentioning"', async () => {
+        await testNormalization('indirect, the user is mentioning', 'indirect');
+      });
+
+      it('extracts passive from "passive: no addressing detected"', async () => {
+        await testNormalization('passive: no addressing detected', 'passive');
+      });
+    });
+
+    describe('fuzzy fallback on full output', () => {
+      it('detects "direct" in full sentence "The message is directly addressing"', async () => {
+        await testNormalization('The message is directly addressing', 'direct');
+      });
+
+      it('detects "addressed" keyword for direct', async () => {
+        await testNormalization('This is clearly addressed to the bot', 'direct');
+      });
+
+      it('detects "indirect" in full sentence', async () => {
+        await testNormalization('The message is indirectly referring', 'indirect');
+      });
+
+      it('detects "mention" keyword for indirect', async () => {
+        await testNormalization('Just mentioning the agent here', 'indirect');
+      });
+
+      it('detects "passive" in full sentence', async () => {
+        await testNormalization('The agent should passively observe', 'passive');
+      });
+
+      it('detects "listen" keyword for passive', async () => {
+        await testNormalization('Agent should just listen', 'passive');
+      });
+
+      it('detects "ignore" in full sentence', async () => {
+        await testNormalization('This message should be ignored', 'ignore');
+      });
+
+      it('detects "skip" keyword for ignore', async () => {
+        await testNormalization('Skip this message', 'ignore');
+      });
+    });
+
+    describe('unrecognized output', () => {
+      it('defaults to ignore for empty string', async () => {
+        await testNormalization('', 'ignore');
+      });
+
+      it('defaults to ignore for whitespace', async () => {
+        await testNormalization('   ', 'ignore');
+      });
+
+      it('defaults to ignore for random text', async () => {
+        await testNormalization('I am a large language model', 'ignore');
+      });
+
+      it('defaults to ignore for "yes" (no keyword match)', async () => {
+        await testNormalization('yes', 'ignore');
+      });
+    });
+  });
+
+  describe('metadata', () => {
+    it('includes raw output and confidence in metadata', async () => {
+      const toolpack = createMockToolpack('direct response here');
+      const agent = new IntentClassifierAgent({ toolpack });
+
+      const result = await agent.invokeAgent({
+        message: 'classify',
+        data: {
+          message: '@assistant help',
+          agentName: 'assistant',
+          agentId: 'U123',
+          senderName: 'alice',
+          channelName: 'general',
+          isDirectMessage: false
+        } as IntentClassifierInput
+      });
+
+      expect(result.metadata).toMatchObject({
+        rawOutput: 'direct response here',
+        classification: 'direct',
+        confidence: 'high'
+      });
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/capabilities/intent-classifier-agent.ts b/packages/toolpack-agents/src/capabilities/intent-classifier-agent.ts
new file mode 100644
index 0000000..a8e8d07
--- /dev/null
+++ b/packages/toolpack-agents/src/capabilities/intent-classifier-agent.ts
@@ -0,0 +1,186 @@
+import { BaseAgentOptions } from './../agent/types.js';
+import { BaseAgent } from '../agent/base-agent.js';
+import { AgentInput, AgentResult } from '../agent/types.js';
+import { CHAT_MODE, type ModeConfig } from 'toolpack-sdk';
+
+/**
+ * Input payload for intent classification.
+ */
+export interface IntentClassifierInput {
+  /** The message content to classify */
+  message: string;
+  /** The agent's display name (e.g., "Assistant") */
+  agentName: string;
+  /** The agent's unique identifier */
+  agentId: string;
+  /** The sender's display name */
+  senderName: string;
+  /** The conversation channel name */
+  channelName: string;
+  /** Whether this is a direct message (IM) context */
+  isDirectMessage?: boolean;
+  /** Previous message context (last 3 messages for continuity) */
+  recentContext?: Array<{
+    sender: string;
+    content: string;
+  }>;
+  /** Whether to include classification examples in the prompt (helps tiny models) */
+  includeExamples?: boolean;
+}
+
+/**
+ * Classification result indicating how the message relates to the target agent.
+ */
+export type IntentClassification =
+  | 'direct'      // Explicitly addressed to the agent (e.g., "@Assistant help me")
+  | 'indirect'    // Mentions agent but not clearly requesting response
+  | 'passive'     // No addressing, agent should listen but not reply
+  | 'ignore';     // Definitely not for this agent (noise, other bot, etc.)
+
+/**
+ * Capability agent that classifies whether a message is directly asking
+ * the target agent to respond.
+ *
+ * Used by the intent-classifier interceptor when the rules-based address
+ * check is ambiguous. Returns a single-word classification.
+ *
+ * Register this agent with an empty channels list to use it as a capability.
+ *
+ * @example
+ * ```ts
+ * const classifier = new IntentClassifierAgent(toolpack);
+ * const result = await classifier.invokeAgent({
+ *   message: 'classify',
+ *   data: {
+ *     message: 'Hey @assistant can you help?',
+ *     agentName: 'assistant',
+ *     agentId: 'U123',
+ *     senderName: 'alice',
+ *     channelName: 'general',
+ *     isDirectMessage: false
+ *   } as IntentClassifierInput
+ * });
+ * // result.output === 'direct'
+ * ```
+ */
+const INTENT_CLASSIFIER_MODE: ModeConfig = {
+  ...CHAT_MODE,
+  name: 'intent-classifier-mode',
+  systemPrompt: [
+    'You classify whether a message is asking an agent to respond.',
+    '',
+    'Categories:',
+    'direct = Message uses @mention, name in greeting, possessive, or commands the agent to act',
+    'indirect = Agent is mentioned but unclear if response wanted (talking ABOUT, not TO them)',
+    'passive = No addressing detected; agent should only listen, not reply',
+    'ignore = Definitely not for this agent (noise, code blocks, other bots)',
+    '',
+    'Response must start with one of: direct, indirect, passive, ignore'
+  ].join('\n'),
+};
+
+export class IntentClassifierAgent extends BaseAgent {
+  name = 'intent-classifier';
+  description = 'Classifies whether a message is directly addressing an agent for response';
+  mode = INTENT_CLASSIFIER_MODE;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    const payload = input.data as IntentClassifierInput | undefined;
+
+    // DMs are always direct — bypass classification entirely
+    if (payload?.isDirectMessage) {
+      return {
+        output: 'direct',
+        metadata: { classification: 'direct', shortCircuit: 'dm' }
+      };
+    }
+
+    if (!payload?.message) {
+      return {
+        output: 'ignore',
+        metadata: { error: 'No message provided for classification' }
+      };
+    }
+
+    const contextLines: string[] = [];
+
+    // DM case already short-circuited above; this only runs for channel messages
+    contextLines.push(`Context: Public channel #${payload.channelName}`);
+
+    contextLines.push(`Target agent: "${payload.agentName}" (ID: ${payload.agentId})`);
+    contextLines.push(`Message sender: ${payload.senderName}`);
+
+    if (payload.recentContext && payload.recentContext.length > 0) {
+      contextLines.push('\nRecent conversation:');
+      for (const msg of payload.recentContext) {
+        contextLines.push(`  ${msg.sender}: ${msg.content.substring(0, 100)}`);
+      }
+    }
+
+    contextLines.push(`\nMessage to classify: "${payload.message}"`);
+
+    if (payload.includeExamples) {
+      contextLines.push('\nExamples of classifications:');
+      contextLines.push(`  "@${payload.agentName} help me" → direct`);
+      contextLines.push(`  "Can someone ask ${payload.agentName} about this?" → indirect`);
+      contextLines.push(`  "I was talking to ${payload.agentName} earlier" → passive`);
+      contextLines.push(`  "Check the logs" → ignore`);
+    }
+
+    contextLines.push('\nClassification (start with direct, indirect, passive, or ignore):');
+
+    const prompt = contextLines.join('\n');
+
+    // Note: per-run mode override reserved for future use (currently uses agent mode)
+    const result = await this.run(prompt);
+
+    // Normalize output to valid classification
+    const normalized = this.normalizeClassification(result.output);
+
+    return {
+      output: normalized,
+      metadata: {
+        rawOutput: result.output,
+        classification: normalized,
+        confidence: 'high' // Could be enhanced with token probabilities in future
+      }
+    };
+  }
+
+  /**
+   * Normalize the LLM output to a valid classification.
+   */
+  private normalizeClassification(output: string): IntentClassification {
+    const cleaned = output.toLowerCase().trim().split(/\s+/)[0];
+    const fullOutput = output.toLowerCase();
+
+    const validClassifications: IntentClassification[] = ['direct', 'indirect', 'passive', 'ignore'];
+
+    // Exact match on first word
+    if (validClassifications.includes(cleaned as IntentClassification)) {
+      return cleaned as IntentClassification;
+    }
+
+    // Fuzzy fallback: check full output for keywords
+    // Order matters: check more specific terms before substring matches
+    if (fullOutput.includes('indirect') || fullOutput.includes('mention')) {
+      return 'indirect';
+    }
+    if (fullOutput.includes('passive') || fullOutput.includes('listen')) {
+      return 'passive';
+    }
+    if (fullOutput.includes('ignore') || fullOutput.includes('skip')) {
+      return 'ignore';
+    }
+    if (fullOutput.includes('direct') || fullOutput.includes('addressed')) {
+      return 'direct';
+    }
+
+    // Default to ignore for any unrecognized output
+    return 'ignore';
+  }
+}
diff --git a/packages/toolpack-agents/src/capabilities/summarizer-agent.test.ts b/packages/toolpack-agents/src/capabilities/summarizer-agent.test.ts
new file mode 100644
index 0000000..1b72e05
--- /dev/null
+++ b/packages/toolpack-agents/src/capabilities/summarizer-agent.test.ts
@@ -0,0 +1,354 @@
+import { describe, it, expect, vi } from 'vitest';
+import { SummarizerAgent, SummarizerInput, HistoryTurn, Participant } from './summarizer-agent.js';
+
+// Mock Toolpack
+function createMockToolpack(generateResult: string) {
+  return {
+    setMode: vi.fn(),
+    registerMode: vi.fn(),
+    generate: vi.fn().mockResolvedValue({
+      content: generateResult,
+      usage: { promptTokens: 200, completionTokens: 50, totalTokens: 250 }
+    })
+  } as unknown as import('toolpack-sdk').Toolpack;
+}
+
+function createParticipant(kind: 'user' | 'agent' | 'system', id: string, displayName?: string): Participant {
+  return { kind, id, displayName };
+}
+
+function createTurn(id: string, participant: Participant, content: string, timestamp?: string): HistoryTurn {
+  return {
+    id,
+    participant,
+    content,
+    timestamp: timestamp ?? new Date().toISOString()
+  };
+}
+
+describe('SummarizerAgent', () => {
+  describe('empty input handling', () => {
+    it('returns placeholder when turns array is empty', async () => {
+      const toolpack = createMockToolpack('{"summary":"test"}');
+      const agent = new SummarizerAgent({ toolpack });
+
+      const result = await agent.invokeAgent({
+        message: 'summarize',
+        data: {
+          turns: [],
+          agentName: 'assistant',
+          agentId: 'U123'
+        } as SummarizerInput
+      });
+
+      const output = JSON.parse(result.output);
+      expect(output.summary).toBe('(No history to summarize)');
+      expect(output.turnsSummarized).toBe(0);
+      expect(output.hasDecisions).toBe(false);
+      expect(toolpack.generate).not.toHaveBeenCalled();
+    });
+
+    it('returns placeholder when data is undefined', async () => {
+      const toolpack = createMockToolpack('{"summary":"test"}');
+      const agent = new SummarizerAgent({ toolpack });
+
+      const result = await agent.invokeAgent({
+        message: 'summarize',
+        data: undefined
+      });
+
+      const output = JSON.parse(result.output);
+      expect(output.summary).toBe('(No history to summarize)');
+      expect(toolpack.generate).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('parseSummarizerOutput', () => {
+    async function testParse(
+      llmOutput: string,
+      turnCount: number,
+      expectedSummary: string,
+      expectedHasDecisions?: boolean
+    ): Promise<void> {
+      const toolpack = createMockToolpack(llmOutput);
+      const agent = new SummarizerAgent({ toolpack });
+
+      const user = createParticipant('user', 'U1', 'alice');
+      const result = await agent.invokeAgent({
+        message: 'summarize',
+        data: {
+          turns: [createTurn('1', user, 'Hello')],
+          agentName: 'assistant',
+          agentId: 'U123'
+        } as SummarizerInput
+      });
+
+      const output = JSON.parse(result.output);
+      expect(output.summary).toBe(expectedSummary);
+      expect(output.turnsSummarized).toBe(turnCount);
+      if (expectedHasDecisions !== undefined) {
+        expect(output.hasDecisions).toBe(expectedHasDecisions);
+      }
+      expect(output.estimatedTokens).toBeGreaterThan(0);
+    }
+
+    describe('clean JSON parsing', () => {
+      it('parses clean JSON object', async () => {
+        await testParse(
+          '{"summary":"Key point discussed","turnsSummarized":5,"hasDecisions":true,"estimatedTokens":50}',
+          5,
+          'Key point discussed',
+          true
+        );
+      });
+
+      it('handles JSON with whitespace', async () => {
+        await testParse(
+          `{
+            "summary": "Multi-line summary",
+            "turnsSummarized": 3,
+            "hasDecisions": false,
+            "estimatedTokens": 40
+          }`,
+          3,
+          'Multi-line summary',
+          false
+        );
+      });
+    });
+
+    describe('JSON in markdown code blocks', () => {
+      it('parses JSON wrapped in ```json block', async () => {
+        await testParse(
+          '```json\n{"summary":"From code block","turnsSummarized":4,"hasDecisions":false,"estimatedTokens":30}\n```',
+          4,
+          'From code block',
+          false
+        );
+      });
+
+      it('parses JSON wrapped in plain ``` block', async () => {
+        await testParse(
+          '```\n{"summary":"Plain code block","turnsSummarized":2,"hasDecisions":true,"estimatedTokens":25}\n```',
+          2,
+          'Plain code block',
+          true
+        );
+      });
+
+      it('handles code block with extra whitespace', async () => {
+        await testParse(
+          '```json\n\n  {"summary":"With whitespace","turnsSummarized":1,"hasDecisions":false,"estimatedTokens":20}\n\n```',
+          1,
+          'With whitespace',
+          false
+        );
+      });
+    });
+
+    describe('non-JSON fallback', () => {
+      it('uses fallback summary for plain text response', async () => {
+        await testParse(
+          'Here is a summary of the conversation that happened earlier',
+          1,
+          '(Summary of 1 conversation turns - key details preserved in full context)',
+          false
+        );
+      });
+
+      it('detects "decision" keyword for hasDecisions', async () => {
+        await testParse(
+          'The decision was made to proceed with the plan',
+          1,
+          '(Summary of 1 conversation turns - key details preserved in full context)',
+          true
+        );
+      });
+
+      it('detects "action" keyword for hasDecisions', async () => {
+        await testParse(
+          'Action items were assigned to the team',
+          1,
+          '(Summary of 1 conversation turns - key details preserved in full context)',
+          true
+        );
+      });
+    });
+
+    describe('field validation', () => {
+      it('uses defaults for missing fields', async () => {
+        const toolpack = createMockToolpack('{"summary":"Valid"}');
+        const agent = new SummarizerAgent({ toolpack });
+        const user = createParticipant('user', 'U1', 'alice');
+
+        const result = await agent.invokeAgent({
+          message: 'summarize',
+          data: {
+            turns: [createTurn('1', user, 'Hello')],
+            agentName: 'assistant',
+            agentId: 'U123'
+          } as SummarizerInput
+        });
+
+        const output = JSON.parse(result.output);
+        expect(output.summary).toBe('Valid');
+        expect(output.turnsSummarized).toBe(1); // defaults to provided count
+        expect(output.hasDecisions).toBe(false); // defaults to false
+        expect(output.estimatedTokens).toBeGreaterThan(0); // estimated from output length
+      });
+
+      it('uses fallback for empty summary string', async () => {
+        const toolpack = createMockToolpack('{"summary":"","turnsSummarized":3}');
+        const agent = new SummarizerAgent({ toolpack });
+        const user = createParticipant('user', 'U1', 'alice');
+
+        const result = await agent.invokeAgent({
+          message: 'summarize',
+          data: {
+            turns: [createTurn('1', user, 'Hello'), createTurn('2', user, 'World'), createTurn('3', user, '!')],
+            agentName: 'assistant',
+            agentId: 'U123'
+          } as SummarizerInput
+        });
+
+        const output = JSON.parse(result.output);
+        expect(output.summary).toBe('(Summary of 3 conversation turns - key details preserved in full context)');
+      });
+    });
+  });
+
+  describe('prompt construction', () => {
+    it('formats participant with display name', async () => {
+      const toolpack = createMockToolpack('{"summary":"test"}');
+      const agent = new SummarizerAgent({ toolpack });
+
+      const user = createParticipant('user', 'U1', 'Alice Smith');
+      const result = await agent.invokeAgent({
+        message: 'summarize',
+        data: {
+          turns: [createTurn('1', user, 'Hello there')],
+          agentName: 'assistant',
+          agentId: 'U123'
+        } as SummarizerInput
+      });
+
+      expect(toolpack.generate).toHaveBeenCalled();
+      const messages = (toolpack.generate as ReturnType<typeof vi.fn>).mock.calls[0][0].messages;
+      const userPrompt = messages[messages.length - 1].content;
+      expect(userPrompt).toContain('Alice Smith:');
+      expect(userPrompt).not.toContain('[BOT]');
+    });
+
+    it('marks agent participants with [BOT] prefix', async () => {
+      const toolpack = createMockToolpack('{"summary":"test"}');
+      const agent = new SummarizerAgent({ toolpack });
+
+      const bot = createParticipant('agent', 'B1', 'HelperBot');
+      const result = await agent.invokeAgent({
+        message: 'summarize',
+        data: {
+          turns: [createTurn('1', bot, 'How can I help?')],
+          agentName: 'assistant',
+          agentId: 'U123'
+        } as SummarizerInput
+      });
+
+      const messages = (toolpack.generate as ReturnType<typeof vi.fn>).mock.calls[0][0].messages;
+      const userPrompt = messages[messages.length - 1].content;
+      expect(userPrompt).toContain('[BOT] HelperBot:');
+    });
+
+    it('falls back to participant id when no displayName', async () => {
+      const toolpack = createMockToolpack('{"summary":"test"}');
+      const agent = new SummarizerAgent({ toolpack });
+
+      const user = createParticipant('user', 'U999'); // no displayName
+      const result = await agent.invokeAgent({
+        message: 'summarize',
+        data: {
+          turns: [createTurn('1', user, 'Message')],
+          agentName: 'assistant',
+          agentId: 'U123'
+        } as SummarizerInput
+      });
+
+      const messages = (toolpack.generate as ReturnType<typeof vi.fn>).mock.calls[0][0].messages;
+      const userPrompt = messages[messages.length - 1].content;
+      expect(userPrompt).toContain('U999:');
+    });
+
+    it('truncates long messages in prompt', async () => {
+      const toolpack = createMockToolpack('{"summary":"test"}');
+      const agent = new SummarizerAgent({ toolpack });
+
+      const user = createParticipant('user', 'U1', 'alice');
+      const longMessage = 'a'.repeat(300);
+      const result = await agent.invokeAgent({
+        message: 'summarize',
+        data: {
+          turns: [createTurn('1', user, longMessage)],
+          agentName: 'assistant',
+          agentId: 'U123'
+        } as SummarizerInput
+      });
+
+      const messages = (toolpack.generate as ReturnType<typeof vi.fn>).mock.calls[0][0].messages;
+      const userPrompt = messages[messages.length - 1].content;
+      expect(userPrompt).toContain('a'.repeat(200));
+      expect(userPrompt).toContain('...');
+      expect(userPrompt).not.toContain('a'.repeat(250));
+    });
+
+    it('includes tool call metadata when present', async () => {
+      const toolpack = createMockToolpack('{"summary":"test"}');
+      const agent = new SummarizerAgent({ toolpack });
+
+      const bot = createParticipant('agent', 'B1', 'ToolBot');
+      const turn: HistoryTurn = {
+        id: '1',
+        participant: bot,
+        content: 'Searching...',
+        timestamp: new Date().toISOString(),
+        metadata: {
+          isToolCall: true,
+          toolName: 'web.search'
+        }
+      };
+
+      const result = await agent.invokeAgent({
+        message: 'summarize',
+        data: {
+          turns: [turn],
+          agentName: 'assistant',
+          agentId: 'U123'
+        } as SummarizerInput
+      });
+
+      const messages = (toolpack.generate as ReturnType<typeof vi.fn>).mock.calls[0][0].messages;
+      const userPrompt = messages[messages.length - 1].content;
+      expect(userPrompt).toContain('[tool: web.search]');
+    });
+  });
+
+  describe('metadata', () => {
+    it('includes turns processed count', async () => {
+      const toolpack = createMockToolpack('{"summary":"Key discussion happened"}');
+      const agent = new SummarizerAgent({ toolpack });
+
+      const user = createParticipant('user', 'U1', 'alice');
+      const result = await agent.invokeAgent({
+        message: 'summarize',
+        data: {
+          turns: [createTurn('1', user, 'Hello'), createTurn('2', user, 'World')],
+          agentName: 'assistant',
+          agentId: 'U123'
+        } as SummarizerInput
+      });
+
+      expect(result.metadata).toMatchObject({
+        turnsProcessed: 2,
+        rawOutputLength: expect.any(Number)
+      });
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/capabilities/summarizer-agent.ts b/packages/toolpack-agents/src/capabilities/summarizer-agent.ts
new file mode 100644
index 0000000..9f731fa
--- /dev/null
+++ b/packages/toolpack-agents/src/capabilities/summarizer-agent.ts
@@ -0,0 +1,243 @@
+import { BaseAgentOptions } from './../agent/types.js';
+import { BaseAgent } from '../agent/base-agent.js';
+import { AgentInput, AgentResult, type Participant } from '../agent/types.js';
+import { CHAT_MODE, type ModeConfig } from 'toolpack-sdk';
+
+// Re-export Participant from core types for back-compat with earlier imports
+// from this module. New code should import Participant from 'toolpack-agents'
+// (the root) or from '../agent/types.js' directly.
+export type { Participant };
+
+/**
+ * A message turn in the conversation history.
+ */
+export interface HistoryTurn {
+  /** Unique identifier for this turn */
+  id: string;
+  /** Participant who sent this message */
+  participant: Participant;
+  /** The message content */
+  content: string;
+  /** ISO timestamp */
+  timestamp: string;
+  /** Optional metadata about the turn */
+  metadata?: {
+    /** Whether this was a tool invocation */
+    isToolCall?: boolean;
+    /** Tool name if applicable */
+    toolName?: string;
+    /** Tool result if applicable */
+    toolResult?: string;
+  };
+}
+
+/**
+ * Input payload for summarization.
+ */
+export interface SummarizerInput {
+  /** The conversation turns to summarize (older messages first) */
+  turns: HistoryTurn[];
+  /** The target agent's name (for perspective-aware summary) */
+  agentName: string;
+  /** The agent's unique identifier */
+  agentId: string;
+  /** Maximum length of the summary in tokens (approximate) */
+  maxTokens?: number;
+  /** Whether to include action items/decisions in the summary */
+  extractDecisions?: boolean;
+}
+
+/**
+ * Result of a summarization operation.
+ */
+export interface SummarizerOutput {
+  /** The generated summary text */
+  summary: string;
+  /** Number of turns that were summarized */
+  turnsSummarized: number;
+  /** Whether decisions/action items were extracted */
+  hasDecisions: boolean;
+  /** Approximate token count of the summary */
+  estimatedTokens: number;
+}
+
+/**
+ * Capability agent that compresses older conversation history turns
+ * into a summary turn for the prompt assembler.
+ *
+ * Used by the prompt assembler when conversation history exceeds
+ * the configured threshold. Returns a compact summary preserving
+ * key facts, decisions, and context.
+ *
+ * Register this agent with an empty channels list to use it as a capability.
+ *
+ * @example
+ * ```ts
+ * const summarizer = new SummarizerAgent(toolpack);
+ * const result = await summarizer.invokeAgent({
+ *   message: 'summarize',
+ *   data: {
+ *     turns: olderTurns,
+ *     agentName: 'name',
+ *     agentId: 'U123',
+ *     maxTokens: 500,
+ *     extractDecisions: true
+ *   } as SummarizerInput
+ * });
+ * const summary = JSON.parse(result.output) as SummarizerOutput;
+ * ```
+ */
+const SUMMARIZER_MODE: ModeConfig = {
+  ...CHAT_MODE,
+  name: 'summarizer-mode',
+  systemPrompt: [
+    'You are a conversation summarizer for multi-participant chat histories.',
+    'Your job is to compress older conversation turns into a dense summary that preserves:',
+    '',
+    '1. Key facts and information shared',
+    '2. Decisions made or action items assigned',
+    '3. Context relevant to the target agent\'s perspective',
+    '4. Important questions asked or problems raised',
+    '',
+    'Summarize from the perspective of the target agent.',
+    'If the agent was not addressed in a turn, note it as observed context.',
+    'Use bullet points for clarity. Be concise but complete.',
+    '',
+    'Output format: Return ONLY a JSON object with these fields:',
+    '- summary: string (the summary text)',
+    '- turnsSummarized: number (count of turns processed)',
+    '- hasDecisions: boolean (whether any decisions/action items were found)',
+    '- estimatedTokens: number (rough estimate: characters / 4)',
+    '',
+    'Do not include markdown code blocks, just the raw JSON.'
+  ].join('\n'),
+};
+
+export class SummarizerAgent extends BaseAgent {
+  name = 'summarizer';
+  description = 'Compresses conversation history into compact summaries for prompt assembly';
+  mode = SUMMARIZER_MODE;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    const payload = input.data as SummarizerInput | undefined;
+
+    if (!payload?.turns || payload.turns.length === 0) {
+      return {
+        output: JSON.stringify({
+          summary: '(No history to summarize)',
+          turnsSummarized: 0,
+          hasDecisions: false,
+          estimatedTokens: 5
+        } as SummarizerOutput),
+        metadata: { emptyInput: true }
+      };
+    }
+
+    const maxTokens = payload.maxTokens ?? 800;
+    const extractDecisions = payload.extractDecisions ?? true;
+
+    // Build the prompt
+    const promptLines: string[] = [
+      `Target agent: "${payload.agentName}" (ID: ${payload.agentId})`,
+      `Maximum summary length: ~${maxTokens} tokens`,
+      `Extract decisions/action items: ${extractDecisions ? 'yes' : 'no'}`,
+      '',
+      `Conversation turns to summarize (${payload.turns.length} turns):`,
+      ''
+    ];
+
+    // Format turns chronologically
+    for (const turn of payload.turns) {
+      const timestamp = new Date(turn.timestamp).toLocaleString('en-US', {
+        month: 'short',
+        day: 'numeric',
+        hour: '2-digit',
+        minute: '2-digit'
+      });
+
+      const participantName = turn.participant.displayName ?? turn.participant.id;
+      const participantLabel = turn.participant.kind === 'agent' ? `[BOT] ${participantName}` : participantName;
+      let line = `[${timestamp}] ${participantLabel}: ${turn.content.substring(0, 200)}`;
+      if (turn.content.length > 200) {
+        line += '...';
+      }
+
+      if (turn.metadata?.isToolCall && turn.metadata.toolName) {
+        line += ` [tool: ${turn.metadata.toolName}]`;
+      }
+
+      promptLines.push(line);
+    }
+
+    promptLines.push('', 'Generate a JSON summary object:');
+
+    const prompt = promptLines.join('\n');
+
+    // Note: per-run mode override reserved for future use (currently uses agent mode)
+    const result = await this.run(prompt);
+
+    // Parse and validate the output
+    const parsed = this.parseSummarizerOutput(result.output, payload.turns.length);
+
+    return {
+      output: JSON.stringify(parsed),
+      metadata: {
+        turnsProcessed: payload.turns.length,
+        rawOutputLength: result.output.length
+      }
+    };
+  }
+
+  /**
+   * Parse and validate the LLM output into a SummarizerOutput.
+   */
+  private parseSummarizerOutput(output: string, turnCount: number): SummarizerOutput {
+    // Try to extract JSON if wrapped in markdown
+    let jsonText = output.trim();
+
+    // Remove markdown code blocks if present
+    const codeBlockMatch = jsonText.match(/```(?:json)?\s*([\s\S]*?)\s*```/);
+    if (codeBlockMatch) {
+      jsonText = codeBlockMatch[1].trim();
+    }
+
+    try {
+      const parsed = JSON.parse(jsonText) as Partial<SummarizerOutput>;
+
+      // Validate and provide defaults
+      return {
+        summary: typeof parsed.summary === 'string' && parsed.summary.length > 0
+          ? parsed.summary
+          : this.generateFallbackSummary(turnCount),
+        turnsSummarized: typeof parsed.turnsSummarized === 'number'
+          ? parsed.turnsSummarized
+          : turnCount,
+        hasDecisions: typeof parsed.hasDecisions === 'boolean'
+          ? parsed.hasDecisions
+          : false,
+        estimatedTokens: typeof parsed.estimatedTokens === 'number' && parsed.estimatedTokens > 0
+          ? parsed.estimatedTokens
+          : Math.ceil(output.length / 4)
+      };
+    } catch {
+      // JSON parsing failed - use fallback
+      return {
+        summary: this.generateFallbackSummary(turnCount),
+        turnsSummarized: turnCount,
+        hasDecisions: output.toLowerCase().includes('decision') || output.toLowerCase().includes('action'),
+        estimatedTokens: Math.ceil(output.length / 4)
+      };
+    }
+  }
+
+  /**
+   * Generate a fallback summary when parsing fails.
+   */
+  private generateFallbackSummary(turnCount: number): string {
+    return `(Summary of ${turnCount} conversation turns - key details preserved in full context)`;
+  }
+}
diff --git a/packages/toolpack-agents/src/channels/base-channel.test.ts b/packages/toolpack-agents/src/channels/base-channel.test.ts
new file mode 100644
index 0000000..21b1e61
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/base-channel.test.ts
@@ -0,0 +1,125 @@
+import { describe, it, expect, vi } from 'vitest';
+import { BaseChannel } from './base-channel.js';
+import { AgentInput, AgentOutput } from '../agent/types.js';
+
+// Test implementation of BaseChannel
+class TestChannel extends BaseChannel {
+  listened = false;
+  sent: AgentOutput[] = [];
+  normalized: unknown[] = [];
+
+  listen(): void {
+    this.listened = true;
+  }
+
+  async send(output: AgentOutput): Promise<void> {
+    this.sent.push(output);
+  }
+
+  normalize(incoming: unknown): AgentInput {
+    this.normalized.push(incoming);
+    return {
+      message: String(incoming),
+    };
+  }
+}
+
+describe('BaseChannel', () => {
+  describe('name property', () => {
+    it('should support optional name', () => {
+      const channel = new TestChannel();
+      expect(channel.name).toBeUndefined();
+
+      channel.name = 'test-channel';
+      expect(channel.name).toBe('test-channel');
+    });
+  });
+
+  describe('onMessage', () => {
+    it('should set handler', async () => {
+      const channel = new TestChannel();
+      const handler = vi.fn().mockResolvedValue(undefined);
+
+      channel.onMessage(handler);
+
+      // Trigger handler via protected handleMessage method
+      const input: AgentInput = { message: 'test' };
+      await (channel as unknown as { handleMessage(input: AgentInput): Promise<void> }).handleMessage(input);
+
+      expect(handler).toHaveBeenCalledWith(input);
+    });
+  });
+
+  describe('abstract methods', () => {
+    it('should require listen implementation', () => {
+      const channel = new TestChannel();
+
+      channel.listen();
+      expect(channel.listened).toBe(true);
+    });
+
+    it('should require send implementation', async () => {
+      const channel = new TestChannel();
+
+      const output: AgentOutput = { output: 'test' };
+      await channel.send(output);
+
+      expect(channel.sent).toContainEqual(output);
+    });
+
+    it('should require normalize implementation', () => {
+      const channel = new TestChannel();
+
+      const input = channel.normalize('test-input');
+
+      expect(channel.normalized).toContainEqual('test-input');
+      expect(input.message).toBe('test-input');
+    });
+  });
+
+  describe('normalize patterns', () => {
+    it('should handle string input', () => {
+      const channel = new TestChannel();
+      const input = channel.normalize('hello');
+
+      expect(input.message).toBe('hello');
+    });
+
+    it('should handle object input', () => {
+      const channel = new TestChannel();
+      const input = channel.normalize({ text: 'hello', user: 'test' });
+
+      expect(input.message).toBe('[object Object]');
+    });
+
+    it('should handle complex input with all fields', () => {
+      class ComplexChannel extends BaseChannel {
+        listen(): void {}
+        async send(): Promise<void> {}
+        normalize(incoming: unknown): AgentInput {
+          const data = incoming as Record<string, unknown>;
+          return {
+            intent: data.intent as string,
+            message: data.text as string,
+            data: incoming,
+            context: { source: data.source as string },
+            conversationId: data.threadId as string,
+          };
+        }
+      }
+
+      const channel = new ComplexChannel();
+      const input = channel.normalize({
+        intent: 'greeting',
+        text: 'Hello!',
+        source: 'slack',
+        threadId: 'thread-123',
+      });
+
+      expect(input.intent).toBe('greeting');
+      expect(input.message).toBe('Hello!');
+      expect(input.conversationId).toBe('thread-123');
+      expect(input.context?.source).toBe('slack');
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/channels/base-channel.ts b/packages/toolpack-agents/src/channels/base-channel.ts
new file mode 100644
index 0000000..e9cbe70
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/base-channel.ts
@@ -0,0 +1,58 @@
+import { AgentInput, AgentOutput } from '../agent/types.js';
+
+/**
+ * Abstract base class for all agent channels.
+ * Channels handle the two-way communication between the external world and agents.
+ */
+export abstract class BaseChannel {
+  /** Optional name for the channel - required for sendTo() routing */
+  name?: string;
+
+  /**
+   * Whether this is a trigger channel (no human recipient).
+   * Trigger channels like ScheduledChannel cannot use this.ask() since there's no human to answer.
+   * Conversation channels (Slack, Telegram, Webhook) can use this.ask().
+   */
+  abstract readonly isTriggerChannel: boolean;
+
+  /** Message handler set by AgentRegistry */
+  protected _handler?: (input: AgentInput) => Promise<void>;
+
+  /**
+   * Start listening for incoming messages.
+   * Called by AgentRegistry when the SDK initializes.
+   */
+  abstract listen(): void;
+
+  /**
+   * Send output back to the external world.
+   * @param output The agent's output to deliver
+   */
+  abstract send(output: AgentOutput): Promise<void>;
+
+  /**
+   * Normalize an incoming event into AgentInput.
+   * Each channel implementation maps its specific event format.
+   * @param incoming Raw event from the external source
+   * @returns Normalized AgentInput
+   */
+  abstract normalize(incoming: unknown): AgentInput;
+
+  /**
+   * Set the message handler. Called by AgentRegistry.
+   * @param handler Function to call when a message arrives
+   */
+  onMessage(handler: (input: AgentInput) => Promise<void>): void {
+    this._handler = handler;
+  }
+
+  /**
+   * Helper to call the handler if set.
+   * @param input The normalized agent input
+   */
+  protected async handleMessage(input: AgentInput): Promise<void> {
+    if (this._handler) {
+      await this._handler(input);
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/channels/discord-channel.test.ts b/packages/toolpack-agents/src/channels/discord-channel.test.ts
new file mode 100644
index 0000000..cffeb3e
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/discord-channel.test.ts
@@ -0,0 +1,208 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { DiscordChannel } from './discord-channel.js';
+
+describe('DiscordChannel', () => {
+  let channel: DiscordChannel;
+
+  beforeEach(() => {
+    channel = new DiscordChannel({
+      name: 'test-discord',
+      token: 'discord-bot-token',
+      guildId: '123456789',
+      channelId: '987654321',
+    });
+  });
+
+  it('should have correct configuration', () => {
+    expect(channel.name).toBe('test-discord');
+    expect(channel.isTriggerChannel).toBe(false);
+  });
+
+  it('should not be a trigger channel (supports two-way)', () => {
+    expect(channel.isTriggerChannel).toBe(false);
+  });
+
+  it('should normalize Discord message', () => {
+    const message = {
+      content: 'Hello from Discord',
+      channelId: '987654321',
+      guildId: '123456789',
+      id: 'msg123',
+      author: {
+        id: 'user123',
+        username: 'testuser',
+        bot: false,
+      },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.message).toBe('Hello from Discord');
+    expect(input.conversationId).toBe('987654321');
+    expect(input.context?.userId).toBe('user123');
+    expect(input.context?.username).toBe('testuser');
+    expect(input.context?.channelId).toBe('987654321');
+  });
+
+  it('should normalize Discord message with thread', () => {
+    const message = {
+      content: 'Hello from thread',
+      channelId: '987654321',
+      guildId: '123456789',
+      id: 'msg123',
+      thread: {
+        id: 'thread123',
+      },
+      author: {
+        id: 'user123',
+        username: 'testuser',
+        bot: false,
+      },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.conversationId).toBe('987654321:thread123');
+    expect(input.context?.threadId).toBe('thread123');
+  });
+
+  it('keeps context.channelId as bare channel ID for threaded messages', () => {
+    const message = {
+      content: 'Thread reply',
+      channelId: '987654321',
+      id: 'msg123',
+      thread: { id: 'thread123' },
+      author: { id: 'user123', username: 'testuser' },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.conversationId).toBe('987654321:thread123');
+    expect(input.context?.channelId).toBe('987654321');
+  });
+
+  it('produces empty string conversationId when message.channelId is absent', () => {
+    const message = {
+      content: 'Hello',
+      id: 'msg1',
+      author: { id: 'u1', username: 'alice' },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.conversationId).toBe('');
+    expect(input.context?.channelId).toBeUndefined();
+  });
+
+  it('populates participant from message.author', () => {
+    const message = {
+      content: 'Hello',
+      channelId: '987654321',
+      id: 'msg1',
+      author: { id: 'u1', username: 'alice', globalName: 'Alice' },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.participant).toEqual({ kind: 'user', id: 'u1', displayName: 'Alice' });
+  });
+
+  it('uses username as displayName when globalName is absent', () => {
+    const message = {
+      content: 'Hello',
+      channelId: '987654321',
+      id: 'msg1',
+      author: { id: 'u1', username: 'alice' },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.participant).toEqual({ kind: 'user', id: 'u1', displayName: 'alice' });
+  });
+
+  it('sets participant to undefined when author is absent (webhook/system message)', () => {
+    const message = {
+      content: 'System message',
+      channelId: '987654321',
+      id: 'msg1',
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.participant).toBeUndefined();
+  });
+
+  it('sets channelType to "dm" for DM channels (type 1)', () => {
+    const message = {
+      content: 'DM',
+      channelId: '987654321',
+      id: 'msg1',
+      channel: { type: 1, name: undefined },
+      author: { id: 'u1', username: 'alice' },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.context?.channelType).toBe('dm');
+  });
+
+  it('sets channelType to "dm" for Group DM channels (type 3)', () => {
+    const message = {
+      content: 'Group DM',
+      channelId: '987654321',
+      id: 'msg1',
+      channel: { type: 3 },
+      author: { id: 'u1', username: 'alice' },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.context?.channelType).toBe('dm');
+  });
+
+  it('sets channelType to "channel" for guild text channels', () => {
+    const message = {
+      content: 'Hello',
+      channelId: '987654321',
+      id: 'msg1',
+      channel: { type: 0, name: 'general' },
+      author: { id: 'u1', username: 'alice' },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.context?.channelType).toBe('channel');
+  });
+
+  it('sets channelName from channel.name', () => {
+    const message = {
+      content: 'Hello',
+      channelId: '987654321',
+      id: 'msg1',
+      channel: { type: 0, name: 'general' },
+      author: { id: 'u1', username: 'alice' },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.context?.channelName).toBe('general');
+  });
+
+  it('sets channelName to undefined when channel.name is absent (DM)', () => {
+    const message = {
+      content: 'DM',
+      channelId: '987654321',
+      id: 'msg1',
+      channel: { type: 1 },
+      author: { id: 'u1', username: 'alice' },
+    };
+
+    const input = channel.normalize(message);
+
+    expect(input.context?.channelName).toBeUndefined();
+  });
+
+  it('should initialize without errors', () => {
+    expect(() => channel.listen()).not.toThrow();
+  });
+});
diff --git a/packages/toolpack-agents/src/channels/discord-channel.ts b/packages/toolpack-agents/src/channels/discord-channel.ts
new file mode 100644
index 0000000..c63a709
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/discord-channel.ts
@@ -0,0 +1,175 @@
+import { BaseChannel } from './base-channel.js';
+import { AgentInput, AgentOutput } from '../agent/types.js';
+
+/**
+ * Configuration options for DiscordChannel.
+ */
+export interface DiscordChannelConfig {
+  /** Optional name for the channel - required for sendTo() routing */
+  name?: string;
+
+  /** Discord bot token */
+  token: string;
+
+  /** Target guild (server) ID */
+  guildId: string;
+
+  /** Target channel ID */
+  channelId: string;
+}
+
+/**
+ * Discord channel for two-way Discord bot integration.
+ * Receives messages from guild channels or DMs and replies in-thread.
+ */
+export class DiscordChannel extends BaseChannel {
+  readonly isTriggerChannel = false;
+  private config: DiscordChannelConfig;
+  private client?: any;
+
+  constructor(config: DiscordChannelConfig) {
+    super();
+    this.config = config;
+    this.name = config.name;
+  }
+
+  /**
+   * Start listening for Discord messages.
+   */
+  listen(): void {
+    if (typeof process !== 'undefined') {
+      import('discord.js').then((discord) => {
+        const { Client, GatewayIntentBits } = discord;
+
+        this.client = new Client({
+          intents: [
+            GatewayIntentBits.Guilds,
+            GatewayIntentBits.GuildMessages,
+            GatewayIntentBits.MessageContent,
+            GatewayIntentBits.DirectMessages,
+          ],
+        });
+
+        this.client.on('ready', () => {
+          console.log(`[DiscordChannel] Bot logged in as ${this.client.user?.tag}`);
+        });
+
+        this.client.on('messageCreate', (message: any) => {
+          this.handleDiscordMessage(message);
+        });
+
+        this.client.login(this.config.token).catch((err: Error) => {
+          console.error('[DiscordChannel] Failed to login to Discord:', err);
+        });
+      }).catch((err) => {
+        console.error('[DiscordChannel] Failed to initialize Discord client:', err);
+        console.error('[DiscordChannel] Make sure to install discord.js: npm install discord.js');
+      });
+    }
+  }
+
+  /**
+   * Send a message to Discord.
+   * @param output The agent output to send
+   */
+  async send(output: AgentOutput): Promise<void> {
+    if (!this.client) {
+      throw new Error('Discord client not initialized. Did you call listen()?');
+    }
+
+    try {
+      const channelId = (output.metadata?.channelId as string) || this.config.channelId;
+      const channel = await this.client.channels.fetch(channelId);
+
+      if (!channel || !('send' in channel)) {
+        throw new Error(`Channel ${channelId} not found or is not a text channel`);
+      }
+
+      const messageOptions: any = {
+        content: output.output,
+      };
+
+      const threadId = output.metadata?.threadId as string | undefined;
+      if (threadId) {
+        const thread = await this.client.channels.fetch(threadId);
+        if (thread && 'send' in thread) {
+          await thread.send(messageOptions);
+          return;
+        }
+      }
+
+      await channel.send(messageOptions);
+    } catch (error) {
+      console.error('[DiscordChannel] Failed to send Discord message:', error);
+      throw new Error(`Failed to send Discord message: ${error instanceof Error ? error.message : String(error)}`);
+    }
+  }
+
+  /**
+   * Normalize a Discord message into AgentInput.
+   * @param incoming Discord message object
+   * @returns Normalized AgentInput
+   */
+  normalize(incoming: unknown): AgentInput {
+    const message = incoming as Record<string, any>;
+
+    // Threads use "channelId:threadId" so thread history is scoped separately
+    // from the parent channel.
+    const rawChannelId = message.channelId as string | undefined;
+    const conversationId = (rawChannelId ?? '') + (message.thread?.id ? `:${message.thread.id}` : '');
+
+    // Discord channel type constants: 1 = DM, 3 = GROUP_DM.
+    const discordChannelType = message.channel?.type as number | undefined;
+    const isDm = discordChannelType === 1 || discordChannelType === 3;
+
+    const authorId = message.author?.id as string | undefined;
+    const authorName = (message.author?.globalName as string | undefined)
+      || (message.author?.username as string | undefined);
+
+    return {
+      message: message.content,
+      conversationId,
+      data: message,
+      participant: authorId
+        ? { kind: 'user', id: authorId, displayName: authorName }
+        : undefined,
+      context: {
+        userId: authorId,
+        username: message.author?.username,
+        // 'dm' for DM/group-DM channels so defaultGetScope returns scope: 'dm'.
+        channelType: isDm ? 'dm' : 'channel',
+        channelId: rawChannelId,
+        channelName: message.channel?.name as string | undefined,
+        guildId: message.guildId,
+        threadId: message.thread?.id,
+        messageId: message.id,
+      },
+    };
+  }
+
+  /**
+   * Handle incoming Discord messages.
+   */
+  private handleDiscordMessage(message: any): void {
+    if (message.author?.bot) {
+      return;
+    }
+
+    if (message.channelId !== this.config.channelId || message.guildId !== this.config.guildId) {
+      return;
+    }
+
+    const input = this.normalize(message);
+    this.handleMessage(input);
+  }
+
+  /**
+   * Stop the Discord client.
+   */
+  async stop(): Promise<void> {
+    if (this.client) {
+      await this.client.destroy();
+      this.client = undefined;
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/channels/email-channel.test.ts b/packages/toolpack-agents/src/channels/email-channel.test.ts
new file mode 100644
index 0000000..2809acf
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/email-channel.test.ts
@@ -0,0 +1,57 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { EmailChannel } from './email-channel.js';
+
+describe('EmailChannel', () => {
+  let channel: EmailChannel;
+
+  beforeEach(() => {
+    channel = new EmailChannel({
+      name: 'test-email',
+      from: 'agent@example.com',
+      to: 'user@example.com',
+      smtp: {
+        host: 'smtp.example.com',
+        port: 587,
+        auth: {
+          user: 'agent@example.com',
+          pass: 'password',
+        },
+      },
+      subject: 'Test Email',
+    });
+  });
+
+  it('should have correct configuration', () => {
+    expect(channel.name).toBe('test-email');
+    expect(channel.isTriggerChannel).toBe(true);
+  });
+
+  it('should be a trigger channel (outbound-only)', () => {
+    expect(channel.isTriggerChannel).toBe(true);
+  });
+
+  it('should throw error when normalize is called', () => {
+    expect(() => channel.normalize({})).toThrow('outbound-only');
+  });
+
+  it('should support multiple recipients', () => {
+    const multiChannel = new EmailChannel({
+      from: 'agent@example.com',
+      to: ['user1@example.com', 'user2@example.com'],
+      smtp: {
+        host: 'smtp.example.com',
+        port: 587,
+        auth: {
+          user: 'agent@example.com',
+          pass: 'password',
+        },
+      },
+    });
+
+    expect(multiChannel).toBeDefined();
+  });
+
+  it('should initialize without errors', () => {
+    expect(() => channel.listen()).not.toThrow();
+  });
+});
diff --git a/packages/toolpack-agents/src/channels/email-channel.ts b/packages/toolpack-agents/src/channels/email-channel.ts
new file mode 100644
index 0000000..455c86a
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/email-channel.ts
@@ -0,0 +1,129 @@
+import { BaseChannel } from './base-channel.js';
+import { AgentOutput } from '../agent/types.js';
+
+/**
+ * Configuration options for EmailChannel.
+ */
+export interface EmailChannelConfig {
+  /** Optional name for the channel - required for sendTo() routing */
+  name?: string;
+
+  /** Sender email address */
+  from: string;
+
+  /** Recipient email address(es) - for scheduled/outbound emails */
+  to: string | string[];
+
+  /** SMTP configuration */
+  smtp: {
+    host: string;
+    port: number;
+    auth: {
+      user: string;
+      pass: string;
+    };
+    secure?: boolean;
+  };
+
+  /** Optional subject line template */
+  subject?: string;
+}
+
+/**
+ * Email channel for sending outbound emails via SMTP.
+ * This is an outbound-only channel - for inbound email handling,
+ * use a custom email-reader tool + WebhookChannel.
+ */
+export class EmailChannel extends BaseChannel {
+  readonly isTriggerChannel = true;
+  private config: EmailChannelConfig;
+  private transporter?: any;
+
+  constructor(config: EmailChannelConfig) {
+    super();
+    this.config = config;
+    this.name = config.name;
+  }
+
+  /**
+   * Initialize the email transporter.
+   * EmailChannel is outbound-only, so listen() just sets up the transporter.
+   */
+  listen(): void {
+    if (typeof process !== 'undefined') {
+      import('nodemailer').then((nodemailer) => {
+        this.transporter = nodemailer.default.createTransport({
+          host: this.config.smtp.host,
+          port: this.config.smtp.port,
+          secure: this.config.smtp.secure ?? (this.config.smtp.port === 465),
+          auth: {
+            user: this.config.smtp.auth.user,
+            pass: this.config.smtp.auth.pass,
+          },
+        });
+
+        console.log(`[EmailChannel] Email transporter initialized for ${this.config.from}`);
+      }).catch((err) => {
+        console.error('[EmailChannel] Failed to initialize nodemailer:', err);
+        console.error('[EmailChannel] Make sure to install nodemailer: npm install nodemailer');
+      });
+    }
+  }
+
+  /**
+   * Send an email with the agent's output.
+   * @param output The agent output to send
+   */
+  async send(output: AgentOutput): Promise<void> {
+    if (!this.transporter) {
+      throw new Error('Email transporter not initialized. Did you call listen()?');
+    }
+
+    const recipients = Array.isArray(this.config.to) ? this.config.to : [this.config.to];
+    const subject = this.config.subject || 'Message from Agent';
+
+    const mailOptions = {
+      from: this.config.from,
+      to: recipients.join(', '),
+      subject,
+      text: output.output,
+      html: this.formatAsHtml(output.output),
+    };
+
+    try {
+      const info = await this.transporter.sendMail(mailOptions);
+      console.log(`[EmailChannel] Email sent: ${info.messageId}`);
+    } catch (error) {
+      console.error('[EmailChannel] Failed to send email:', error);
+      throw new Error(`Failed to send email: ${error instanceof Error ? error.message : String(error)}`);
+    }
+  }
+
+  /**
+   * EmailChannel is outbound-only and doesn't receive messages.
+   * This method should not be called.
+   */
+  normalize(_incoming: unknown): never {
+    throw new Error('EmailChannel is outbound-only. Use WebhookChannel with email webhook events for inbound email.');
+  }
+
+  /**
+   * Format plain text as HTML for better email rendering.
+   */
+  private formatAsHtml(text: string): string {
+    return text
+      .split('\n\n')
+      .map(para => `<p>${para.replace(/\n/g, '<br>')}</p>`)
+      .join('');
+  }
+
+  /**
+   * Close the email transporter.
+   */
+  async stop(): Promise<void> {
+    if (this.transporter) {
+      this.transporter.close();
+      this.transporter = undefined;
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/channels/index.ts b/packages/toolpack-agents/src/channels/index.ts
new file mode 100644
index 0000000..0aec180
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/index.ts
@@ -0,0 +1,8 @@
+export { BaseChannel } from './base-channel.js';
+export { SlackChannel, SlackChannelConfig } from './slack-channel.js';
+export { WebhookChannel, WebhookChannelConfig } from './webhook-channel.js';
+export { ScheduledChannel, ScheduledChannelConfig } from './scheduled-channel.js';
+export { TelegramChannel, TelegramChannelConfig } from './telegram-channel.js';
+export { DiscordChannel, DiscordChannelConfig } from './discord-channel.js';
+export { EmailChannel, EmailChannelConfig } from './email-channel.js';
+export { SMSChannel, SMSChannelConfig } from './sms-channel.js';
diff --git a/packages/toolpack-agents/src/channels/scheduled-channel.test.ts b/packages/toolpack-agents/src/channels/scheduled-channel.test.ts
new file mode 100644
index 0000000..0a3f184
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/scheduled-channel.test.ts
@@ -0,0 +1,299 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { ScheduledChannel, ScheduledChannelConfig } from './scheduled-channel.js';
+import { AgentInput, AgentOutput } from '../agent/types.js';
+
+describe('ScheduledChannel', () => {
+  const baseConfig: ScheduledChannelConfig = {
+    cron: '0 9 * * 1-5',
+    notify: 'webhook:https://hooks.example.com/report',
+  };
+
+  describe('constructor', () => {
+    it('should create with required config', () => {
+      const channel = new ScheduledChannel(baseConfig);
+      expect(channel).toBeDefined();
+    });
+
+    it('should set name from config', () => {
+      const channel = new ScheduledChannel({ ...baseConfig, name: 'morning-report' });
+      expect(channel.name).toBe('morning-report');
+    });
+
+    it('should parse cron expression', () => {
+      const channel = new ScheduledChannel(baseConfig);
+      // Just verify it doesn't throw
+      expect(channel).toBeDefined();
+    });
+
+    it('should throw on invalid cron expression', () => {
+      expect(() => {
+        new ScheduledChannel({
+          cron: 'invalid',
+          notify: 'webhook:https://hooks.example.com/x',
+        });
+      }).toThrow('Invalid cron expression');
+    });
+  });
+
+  describe('normalize', () => {
+    it('should create AgentInput with pre-set intent', () => {
+      const channel = new ScheduledChannel({
+        ...baseConfig,
+        intent: 'daily_report',
+      });
+
+      const input = channel.normalize(null);
+
+      expect(input.intent).toBe('daily_report');
+      expect(input.message).toContain('Scheduled task triggered');
+    });
+
+    it('should have isTriggerChannel set to true', () => {
+      const channel = new ScheduledChannel(baseConfig);
+      expect(channel.isTriggerChannel).toBe(true);
+    });
+
+    it('should include date-keyed conversationId', () => {
+      const channel = new ScheduledChannel(baseConfig);
+
+      const input = channel.normalize(null);
+
+      // Should be in format: scheduled:{name}:{date}
+      expect(input.conversationId).toMatch(/^scheduled:/);
+    });
+
+    it('should include scheduled metadata in data', () => {
+      const channel = new ScheduledChannel(baseConfig);
+
+      const input = channel.normalize(null);
+
+      expect(input.data).toMatchObject({
+        scheduled: true,
+        cron: '0 9 * * 1-5',
+      });
+      expect(input.data).toHaveProperty('timestamp');
+    });
+  });
+
+  describe('send', () => {
+    it("rejects the removed 'slack:' notify protocol with a migration hint", async () => {
+      const channel = new ScheduledChannel({
+        cron: '0 9 * * 1-5',
+        notify: 'slack:#ops',
+      });
+
+      await expect(channel.send({
+        output: 'Daily report',
+        metadata: {},
+      })).rejects.toThrow(/no longer supports the 'slack:' notify protocol/);
+    });
+
+    it('should send to webhook URL', async () => {
+      const channel = new ScheduledChannel({
+        cron: '0 * * * *',
+        notify: 'webhook:https://hooks.example.com/report',
+      });
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        status: 200,
+        statusText: 'OK',
+        json: async () => ({ success: true }),
+      } as unknown as Response);
+
+      await channel.send({
+        output: 'Scheduled task complete',
+        metadata: { task: 'cleanup' },
+      });
+
+      expect(fetch).toHaveBeenCalledWith(
+        'https://hooks.example.com/report',
+        expect.objectContaining({
+          method: 'POST',
+          headers: expect.objectContaining({
+            'Content-Type': 'application/json',
+          }),
+        })
+      );
+
+      // Verify the body contains the expected data
+      const callArgs = (fetch as ReturnType<typeof vi.fn>).mock.calls[0];
+      const body = JSON.parse(callArgs[1].body);
+      expect(body.output).toBe('Scheduled task complete');
+      expect(body.metadata).toEqual({ task: 'cleanup' });
+      expect(body.timestamp).toBeDefined();
+    });
+
+    it('should throw on invalid notify format', async () => {
+      const channel = new ScheduledChannel({
+        cron: '0 * * * *',
+        notify: 'invalid',
+      });
+
+      await expect(channel.send({ output: 'test' }))
+        .rejects.toThrow('Invalid notify format');
+    });
+
+    it('should throw on unknown protocol', async () => {
+      const channel = new ScheduledChannel({
+        cron: '0 * * * *',
+        notify: 'unknown:destination',
+      });
+
+      await expect(channel.send({ output: 'test' }))
+        .rejects.toThrow('Unknown notify protocol');
+    });
+
+    it('should throw on webhook failure', async () => {
+      const channel = new ScheduledChannel({
+        cron: '0 * * * *',
+        notify: 'webhook:https://hooks.example.com/fail',
+      });
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: false,
+        statusText: 'Server Error',
+      } as Response);
+
+      await expect(channel.send({ output: 'test' }))
+        .rejects.toThrow('Webhook notification failed: Server Error');
+    });
+  });
+
+  describe('cron parsing', () => {
+    it('should parse standard cron with 5 parts', () => {
+      const channel = new ScheduledChannel({
+        cron: '0 9 * * 1-5',
+        notify: 'webhook:https://example.com',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support wildcards', () => {
+      const channel = new ScheduledChannel({
+        cron: '* * * * *',
+        notify: 'webhook:https://example.com',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support step values (every 15 minutes)', () => {
+      const channel = new ScheduledChannel({
+        cron: '*/15 * * * *',
+        notify: 'console',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support ranges (9am-5pm)', () => {
+      const channel = new ScheduledChannel({
+        cron: '0 9-17 * * *',
+        notify: 'console',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support lists (specific minutes)', () => {
+      const channel = new ScheduledChannel({
+        cron: '0,15,30,45 * * * *',
+        notify: 'console',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support combinations (every 5 min from 0-30)', () => {
+      const channel = new ScheduledChannel({
+        cron: '0-30/5 * * * *',
+        notify: 'console',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support complex expressions (business hours)', () => {
+      const channel = new ScheduledChannel({
+        cron: '*/15 9-17 * * 1-5',
+        notify: 'console',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support specific days of week', () => {
+      const channel = new ScheduledChannel({
+        cron: '0 10 * * 1,3,5',
+        notify: 'console',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support specific days of month', () => {
+      const channel = new ScheduledChannel({
+        cron: '0 0 1,15 * *',
+        notify: 'console',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support specific months', () => {
+      const channel = new ScheduledChannel({
+        cron: '0 9 1 1,6,12 *',
+        notify: 'console',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support midnight cron', () => {
+      const channel = new ScheduledChannel({
+        cron: '0 0 * * *',
+        notify: 'console',
+      });
+
+      expect(channel).toBeDefined();
+    });
+
+    it('should support noon cron', () => {
+      const channel = new ScheduledChannel({
+        cron: '0 12 * * *',
+        notify: 'console',
+      });
+
+      expect(channel).toBeDefined();
+    });
+  });
+
+  describe('listen', () => {
+    it('should schedule next run', () => {
+      const channel = new ScheduledChannel(baseConfig);
+
+      // Just verify listen doesn't throw
+      expect(() => channel.listen()).not.toThrow();
+    });
+  });
+
+  describe('stop', () => {
+    it('should clear timer if set', async () => {
+      const channel = new ScheduledChannel(baseConfig);
+
+      // Start listening to set up timer
+      channel.listen();
+
+      // Should not throw
+      await expect(channel.stop()).resolves.not.toThrow();
+    });
+
+    it('should handle missing timer gracefully', async () => {
+      const channel = new ScheduledChannel(baseConfig);
+
+      await expect(channel.stop()).resolves.not.toThrow();
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/channels/scheduled-channel.ts b/packages/toolpack-agents/src/channels/scheduled-channel.ts
new file mode 100644
index 0000000..3f77220
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/scheduled-channel.ts
@@ -0,0 +1,214 @@
+import { BaseChannel } from './base-channel.js';
+import { AgentInput, AgentOutput } from '../agent/types.js';
+import { CronExpressionParser } from 'cron-parser';
+
+/**
+ * Configuration options for ScheduledChannel.
+ */
+export interface ScheduledChannelConfig {
+  /** Optional name for the channel - required for sendTo() routing */
+  name?: string;
+
+  /**
+   * Cron expression - supports full cron syntax including wildcards, ranges, steps, and lists.
+   * Supports both 5-field (min hour dom month dow) and 6-field (sec min hour dom month dow) expressions.
+   * Examples: '0 9 * * 1-5' for 9am weekdays, or '0 * /15 * * * *' for every 15 minutes (6-field)
+   */
+  cron: string;
+
+  /** Optional intent to pre-set in AgentInput */
+  intent?: string;
+
+  /** Optional message to send to the agent on each trigger */
+  message?: string;
+
+  /**
+   * Where to deliver the output. Supported protocols:
+   *
+   * - `webhook:<https-url>` — POSTs JSON `{ output, metadata, timestamp }` to the URL.
+   *
+   * For Slack delivery, attach a named `SlackChannel` to the same agent and
+   * route from inside `run()`:
+   *
+   * ```ts
+   * agent.channels = [
+   *   new ScheduledChannel({ name: 'daily', cron: '0 9 * * 1-5', notify: 'webhook:...' }),
+   *   new SlackChannel({ name: 'kore-slack', channel: '#project-kore', token, signingSecret }),
+   * ];
+   *
+   * async run(input) {
+   *   const report = await this.buildReport();
+   *   await this.sendTo('kore-slack', report);
+   *   return { output: report };
+   * }
+   * ```
+   *
+   * This keeps Slack credentials, thread routing, and multi-channel listening
+   * in one place (`SlackChannel`) instead of duplicated inside `ScheduledChannel`.
+   */
+  notify: string;
+}
+
+
+/**
+ * Scheduled channel that runs agents on a cron schedule.
+ * Delivers output to the configured notification destination.
+ */
+export class ScheduledChannel extends BaseChannel {
+  readonly isTriggerChannel = true;
+  private config: ScheduledChannelConfig;
+  private timer?: ReturnType<typeof setTimeout>;
+
+  constructor(config: ScheduledChannelConfig) {
+    super();
+    this.config = config;
+    this.name = config.name;
+    
+    // Validate cron expression on construction
+    try {
+      CronExpressionParser.parse(config.cron);
+    } catch (error) {
+      throw new Error(`Invalid cron expression '${config.cron}': ${(error as Error).message}`);
+    }
+  }
+
+  /**
+   * Start the cron scheduler.
+   */
+  listen(): void {
+    // Calculate initial delay and set up recurring schedule
+    this.scheduleNextRun();
+  }
+
+  /**
+   * Send the agent output to the configured notify destination.
+   * @param output The agent output to send
+   */
+  async send(output: AgentOutput): Promise<void> {
+    // Split only on the first colon to preserve URLs like https://...
+    const colonIndex = this.config.notify.indexOf(':');
+    if (colonIndex === -1) {
+      throw new Error(`Invalid notify format: ${this.config.notify}. Expected format: 'webhook:https://...'`);
+    }
+
+    const protocol = this.config.notify.substring(0, colonIndex);
+    const destination = this.config.notify.substring(colonIndex + 1);
+
+    if (!protocol || !destination) {
+      throw new Error(`Invalid notify format: ${this.config.notify}. Expected format: 'webhook:https://...'`);
+    }
+
+    switch (protocol.toLowerCase()) {
+      case 'webhook':
+        await this.sendToWebhook(destination, output);
+        break;
+      case 'slack':
+        throw new Error(
+          `ScheduledChannel no longer supports the 'slack:' notify protocol. ` +
+          `Attach a named SlackChannel to the agent and route from inside run() via ` +
+          `this.sendTo('<channelName>', output). See ScheduledChannelConfig.notify docs.`
+        );
+      default:
+        throw new Error(`Unknown notify protocol: ${protocol}`);
+    }
+  }
+
+  /**
+   * Normalize the scheduled trigger into AgentInput.
+   * Sets the intent and generates a date-keyed conversationId.
+   * @param _incoming Ignored for scheduled triggers
+   * @returns Normalized AgentInput
+   */
+  // eslint-disable-next-line @typescript-eslint/no-unused-vars
+  normalize(_incoming: unknown): AgentInput {
+    const date = new Date();
+    const dateKey = `${date.getFullYear()}-${date.getMonth() + 1}-${date.getDate()}`;
+
+    return {
+      intent: this.config.intent,
+      message: `Scheduled task triggered at ${date.toISOString()}`,
+      conversationId: `scheduled:${this.name || 'default'}:${dateKey}`,
+      data: {
+        scheduled: true,
+        cron: this.config.cron,
+        timestamp: date.toISOString(),
+      },
+    };
+  }
+
+  /**
+   * Send output to a webhook URL.
+   */
+  private async sendToWebhook(url: string, output: AgentOutput): Promise<void> {
+    const response = await fetch(url, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        output: output.output,
+        metadata: output.metadata,
+        timestamp: new Date().toISOString(),
+      }),
+    });
+
+    if (!response.ok) {
+      throw new Error(`Webhook notification failed: ${response.statusText}`);
+    }
+  }
+
+  /**
+   * Calculate next run time using cron-parser.
+   */
+  private getNextRunTime(): Date {
+    const interval = CronExpressionParser.parse(this.config.cron, {
+      currentDate: new Date(),
+    });
+    
+    return interval.next().toDate();
+  }
+
+  /**
+   * Schedule the next run.
+   */
+  private scheduleNextRun(): void {
+    const nextRun = this.getNextRunTime();
+    const delay = nextRun.getTime() - Date.now();
+
+    if (delay <= 0) {
+      // Next run is in the past (race condition) — reschedule immediately
+      this.scheduleNextRun();
+      return;
+    }
+
+    console.log(`[ScheduledChannel] Next run scheduled for ${nextRun.toISOString()}`);
+
+    this.timer = setTimeout(() => {
+      this.trigger();
+      this.scheduleNextRun(); // Schedule the next occurrence
+    }, delay);
+  }
+
+  /**
+   * Trigger the scheduled task.
+   */
+  private async trigger(): Promise<void> {
+    const input = this.normalize(null);
+
+    try {
+      await this.handleMessage(input);
+    } catch (error) {
+      console.error('[ScheduledChannel] Error triggering scheduled task:', error);
+    }
+  }
+
+  /**
+   * Stop the scheduler.
+   */
+  async stop(): Promise<void> {
+    if (this.timer) {
+      clearTimeout(this.timer);
+      this.timer = undefined;
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/channels/slack-channel.test.ts b/packages/toolpack-agents/src/channels/slack-channel.test.ts
new file mode 100644
index 0000000..87f54fe
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/slack-channel.test.ts
@@ -0,0 +1,1147 @@
+import { createHmac } from 'crypto';
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { SlackChannel, SlackChannelConfig } from './slack-channel.js';
+import { AgentInput, AgentOutput } from '../agent/types.js';
+
+describe('SlackChannel', () => {
+  const baseConfig: SlackChannelConfig = {
+    channel: '#support',
+    token: 'xoxb-test-token',
+    signingSecret: 'test-secret',
+    port: 3101, // Unique port for Slack tests
+  };
+
+  describe('constructor', () => {
+    it('should create with required config', () => {
+      const channel = new SlackChannel(baseConfig);
+      expect(channel).toBeDefined();
+    });
+
+    it('should set name from config', () => {
+      const channel = new SlackChannel({ ...baseConfig, name: 'slack-support' });
+      expect(channel.name).toBe('slack-support');
+    });
+
+    it('should use default port if not specified', () => {
+      const channel = new SlackChannel({
+        channel: '#general',
+        token: 'token',
+        signingSecret: 'secret',
+      });
+      expect(channel).toBeDefined();
+    });
+
+    it('should have isTriggerChannel set to false', () => {
+      const channel = new SlackChannel(baseConfig);
+      expect(channel.isTriggerChannel).toBe(false);
+    });
+  });
+
+  describe('normalize', () => {
+    it('should map Slack event to AgentInput', () => {
+      const channel = new SlackChannel(baseConfig);
+
+      const slackEvent = {
+        text: 'Hello bot',
+        user: 'U12345',
+        channel: 'C67890',
+        ts: '1234567890.123456',
+        thread_ts: '1234567890.000000',
+        team: 'T123',
+      };
+
+      const input = channel.normalize(slackEvent);
+
+      expect(input.message).toBe('Hello bot');
+      expect(input.conversationId).toBe('1234567890.000000');
+      expect(input.context?.user).toBe('U12345');
+      expect(input.context?.channel).toBe('C67890');
+      expect(input.context?.team).toBe('T123');
+    });
+
+    it('falls back to ts when event.channel is absent', () => {
+      const channel = new SlackChannel(baseConfig);
+      const input = channel.normalize({
+        text: 'msg',
+        user: 'U123',
+        ts: '1234567890.999999',
+      });
+      expect(input.conversationId).toBe('1234567890.999999');
+    });
+
+    it('produces empty string conversationId when both channel and ts are absent', () => {
+      const channel = new SlackChannel(baseConfig);
+      const input = channel.normalize({ text: 'msg', user: 'U123' });
+      expect(input.conversationId).toBe('');
+    });
+
+    it('should use channel id as conversationId when thread_ts not present', () => {
+      const channel = new SlackChannel(baseConfig);
+
+      // Top-level channel messages are keyed by channel id so all messages
+      // in the same channel share one conversation in the store.
+      const slackEvent = {
+        text: 'Direct message',
+        user: 'U12345',
+        channel: 'C67890',
+        ts: '1234567890.123456',
+      };
+
+      const input = channel.normalize(slackEvent);
+
+      expect(input.conversationId).toBe('C67890');
+    });
+
+    it('should handle missing text', () => {
+      const channel = new SlackChannel(baseConfig);
+
+      const slackEvent = {
+        user: 'U12345',
+        ts: '1234567890.123456',
+      };
+
+      const input = channel.normalize(slackEvent);
+
+      expect(input.message).toBe('');
+    });
+
+    it('should include raw event in data', () => {
+      const channel = new SlackChannel(baseConfig);
+
+      const slackEvent = {
+        text: 'Hello',
+        ts: '1234567890.123456',
+        custom_field: 'value',
+      };
+
+      const input = channel.normalize(slackEvent);
+
+      expect(input.data).toEqual(slackEvent);
+    });
+  });
+
+  describe('send', () => {
+    it('should call Slack API with correct payload', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: true }),
+      } as Response);
+
+      await channel.send({
+        output: 'Hello user!',
+        metadata: {},
+      });
+
+      expect(fetch).toHaveBeenCalledWith(
+        'https://slack.com/api/chat.postMessage',
+        expect.objectContaining({
+          method: 'POST',
+          headers: expect.objectContaining({
+            'Authorization': 'Bearer xoxb-test-token',
+            'Content-Type': 'application/json',
+          }),
+          body: expect.stringContaining('Hello user!'),
+        })
+      );
+
+      const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
+      expect(body.channel).toBe('#support');
+      expect(body.text).toBe('Hello user!');
+    });
+
+    it('should include thread_ts for threaded replies', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: true }),
+      } as Response);
+
+      await channel.send({
+        output: 'Reply in thread',
+        metadata: {
+          thread_ts: '1234567890.000000',
+        },
+      });
+
+      const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
+      expect(body.thread_ts).toBe('1234567890.000000');
+    });
+
+    it('should support threadTs alias', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: true }),
+      } as Response);
+
+      await channel.send({
+        output: 'Reply in thread',
+        metadata: {
+          threadTs: '1234567890.000000',
+        },
+      });
+
+      const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
+      expect(body.thread_ts).toBe('1234567890.000000');
+    });
+
+    it('should use metadata.channelId when present instead of config.channel', async () => {
+      const channel = new SlackChannel({ ...baseConfig, channel: '#general' });
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: true }),
+      } as Response);
+
+      await channel.send({
+        output: 'Hello from a different channel',
+        metadata: {
+          channelId: 'C99999', // runtime channel from input context
+        },
+      });
+
+      const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
+      expect(body.channel).toBe('C99999'); // should use metadata, not config
+    });
+
+    it('should fall back to config.channel when no metadata.channelId', async () => {
+      const channel = new SlackChannel({ ...baseConfig, channel: '#general' });
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: true }),
+      } as Response);
+
+      await channel.send({
+        output: 'Hello using config channel',
+      });
+
+      const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
+      expect(body.channel).toBe('#general'); // fallback to config
+    });
+
+    it('should use metadata.threadId for threaded replies', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: true }),
+      } as Response);
+
+      await channel.send({
+        output: 'Reply in thread via threadId',
+        metadata: {
+          threadId: '1730250000.000001', // set by normalize via context propagation
+        },
+      });
+
+      const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
+      expect(body.thread_ts).toBe('1730250000.000001');
+    });
+
+    it('should throw on API error', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: false, error: 'channel_not_found' }),
+      } as Response);
+
+      await expect(channel.send({ output: 'Test' })).rejects.toThrow('Slack API error: channel_not_found');
+    });
+
+    it('should throw on HTTP error', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: false,
+        statusText: 'Unauthorized',
+      } as Response);
+
+      await expect(channel.send({ output: 'Test' })).rejects.toThrow('Failed to send Slack message: Unauthorized');
+    });
+  });
+
+  describe('listen', () => {
+    it('should start HTTP server', () => {
+      const channel = new SlackChannel(baseConfig);
+
+      // Mock http module
+      const mockServer = {
+        listen: vi.fn(),
+      };
+
+      vi.doMock('http', () => ({
+        createServer: () => mockServer,
+      }));
+
+      // Just verify listen() doesn't throw
+      expect(() => channel.listen()).not.toThrow();
+    });
+  });
+
+  describe('normalize - participant', () => {
+    it('populates first-class participant field with user id when user is present', () => {
+      const channel = new SlackChannel(baseConfig);
+      const input = channel.normalize({
+        text: 'hi',
+        user: 'U12345',
+        ts: '1234567890.123456',
+      });
+      expect(input.participant).toEqual({ kind: 'user', id: 'U12345' });
+    });
+
+    it('leaves participant undefined when event has no user (e.g. bot messages)', () => {
+      const channel = new SlackChannel(baseConfig);
+      const input = channel.normalize({
+        text: 'bot msg',
+        ts: '1234567890.123456',
+      });
+      expect(input.participant).toBeUndefined();
+    });
+
+    it('exposes channelType in context for DM detection', () => {
+      const channel = new SlackChannel(baseConfig);
+      const input = channel.normalize({
+        text: 'dm',
+        user: 'U12345',
+        ts: '1234567890.123456',
+        channel_type: 'im',
+      });
+      expect(input.context?.channelType).toBe('im');
+    });
+
+    it('sets context.threadId for threaded replies so defaultGetScope returns "thread"', () => {
+      const channel = new SlackChannel(baseConfig);
+      // A threaded reply has thread_ts (parent) !== ts (this message).
+      const input = channel.normalize({
+        text: 'reply in thread',
+        user: 'U12345',
+        ts: '1234567890.999999',
+        thread_ts: '1234567890.000000', // parent ts
+      });
+      expect(input.context?.threadId).toBe('1234567890.000000');
+      // conversationId should still be the thread root ts
+      expect(input.conversationId).toBe('1234567890.000000');
+    });
+
+    it('does not set context.threadId for top-level messages (thread_ts equals ts)', () => {
+      const channel = new SlackChannel(baseConfig);
+      // Some Slack events set thread_ts === ts for the parent message itself.
+      const input = channel.normalize({
+        text: 'top-level message',
+        user: 'U12345',
+        ts: '1234567890.000000',
+        thread_ts: '1234567890.000000',
+      });
+      expect(input.context?.threadId).toBeUndefined();
+    });
+
+    it('does not set context.threadId when thread_ts is absent', () => {
+      const channel = new SlackChannel(baseConfig);
+      const input = channel.normalize({
+        text: 'plain channel message',
+        user: 'U12345',
+        ts: '1234567890.000000',
+      });
+      expect(input.context?.threadId).toBeUndefined();
+    });
+
+    it('extracts @-mention user ids from <@UABC123> tokens in text', () => {
+      const channel = new SlackChannel(baseConfig);
+      const input = channel.normalize({
+        text: 'Hey <@UABC123> and <@UDEF456>, can you help?',
+        user: 'U12345',
+        ts: '1234567890.000000',
+      });
+      expect(input.context?.mentions).toEqual(['UABC123', 'UDEF456']);
+    });
+
+    it('sets context.mentions to undefined when no mentions are present', () => {
+      const channel = new SlackChannel(baseConfig);
+      const input = channel.normalize({
+        text: 'hello everyone',
+        user: 'U12345',
+        ts: '1234567890.000000',
+      });
+      expect(input.context?.mentions).toBeUndefined();
+    });
+
+    it('sets context.channelId and context.channelName for channel-level messages', () => {
+      const channel = new SlackChannel({ ...baseConfig, channel: '#support' });
+      const input = channel.normalize({
+        text: 'hello',
+        user: 'U12345',
+        channel: 'C67890',
+        ts: '1234567890.000000',
+      });
+      expect(input.context?.channelId).toBe('C67890');
+      expect(input.context?.channelName).toBe('#support');
+    });
+
+    it('uses channel id as conversationId for top-level messages (channels are grouped by id)', () => {
+      const channel = new SlackChannel(baseConfig);
+      const msg1 = channel.normalize({ text: 'first', user: 'U1', channel: 'C99', ts: '1000.001' });
+      const msg2 = channel.normalize({ text: 'second', user: 'U2', channel: 'C99', ts: '1000.002' });
+      // Both messages in C99 share the same conversationId
+      expect(msg1.conversationId).toBe('C99');
+      expect(msg2.conversationId).toBe('C99');
+    });
+
+    it('uses thread_ts as conversationId for thread replies (threads grouped separately)', () => {
+      const channel = new SlackChannel(baseConfig);
+      const reply1 = channel.normalize({ text: 'r1', user: 'U1', channel: 'C99', ts: '1000.002', thread_ts: '1000.001' });
+      const reply2 = channel.normalize({ text: 'r2', user: 'U2', channel: 'C99', ts: '1000.003', thread_ts: '1000.001' });
+      expect(reply1.conversationId).toBe('1000.001');
+      expect(reply2.conversationId).toBe('1000.001');
+    });
+  });
+
+  describe('resolveParticipant', () => {
+    beforeEach(() => {
+      // Ensure fetch is a fresh mock per test.
+      global.fetch = vi.fn();
+    });
+
+    it('returns undefined when input has no user id', async () => {
+      const channel = new SlackChannel(baseConfig);
+      const p = await channel.resolveParticipant({ message: 'hi', conversationId: 'c1' });
+      expect(p).toBeUndefined();
+      expect(fetch).not.toHaveBeenCalled();
+    });
+
+    it('hits users.info and returns participant with displayName', async () => {
+      const channel = new SlackChannel(baseConfig);
+      (fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          ok: true,
+          user: {
+            name: 'alice',
+            real_name: 'Alice Real',
+            profile: { display_name: 'alice-display', real_name: 'Alice Profile' },
+          },
+        }),
+      } as Response);
+
+      const p = await channel.resolveParticipant({
+        message: 'hi',
+        conversationId: 'c1',
+        participant: { kind: 'user', id: 'U12345' },
+      });
+
+      expect(p).toMatchObject({
+        kind: 'user',
+        id: 'U12345',
+        displayName: 'alice-display',
+      });
+      expect(fetch).toHaveBeenCalledWith(
+        'https://slack.com/api/users.info?user=U12345',
+        expect.objectContaining({
+          headers: expect.objectContaining({ Authorization: 'Bearer xoxb-test-token' }),
+        })
+      );
+    });
+
+    it('caches resolved participants and does not hit fetch twice', async () => {
+      const channel = new SlackChannel(baseConfig);
+      (fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          ok: true,
+          user: { name: 'alice', profile: { display_name: 'alice' } },
+        }),
+      } as Response);
+
+      const input: AgentInput = {
+        message: 'hi',
+        conversationId: 'c1',
+        participant: { kind: 'user', id: 'U12345' },
+      };
+
+      await channel.resolveParticipant(input);
+      await channel.resolveParticipant(input);
+
+      expect(fetch).toHaveBeenCalledTimes(1);
+    });
+
+    it('invalidateParticipant forces a re-fetch next time', async () => {
+      const channel = new SlackChannel(baseConfig);
+      (fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          ok: true,
+          user: { name: 'alice', profile: { display_name: 'alice' } },
+        }),
+      } as Response);
+
+      const input: AgentInput = {
+        message: 'hi',
+        conversationId: 'c1',
+        participant: { kind: 'user', id: 'U12345' },
+      };
+
+      await channel.resolveParticipant(input);
+      channel.invalidateParticipant('U12345');
+      await channel.resolveParticipant(input);
+
+      expect(fetch).toHaveBeenCalledTimes(2);
+    });
+
+    it('falls back to id-only participant on HTTP error (no throw)', async () => {
+      const channel = new SlackChannel(baseConfig);
+      (fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+        ok: false,
+        statusText: 'Unauthorized',
+      } as Response);
+
+      const p = await channel.resolveParticipant({
+        message: 'hi',
+        conversationId: 'c1',
+        participant: { kind: 'user', id: 'U12345' },
+      });
+      expect(p).toEqual({ kind: 'user', id: 'U12345' });
+    });
+
+    it('falls back to id-only participant when fetch throws', async () => {
+      const channel = new SlackChannel(baseConfig);
+      (fetch as ReturnType<typeof vi.fn>).mockRejectedValue(new Error('network down'));
+
+      const p = await channel.resolveParticipant({
+        message: 'hi',
+        conversationId: 'c1',
+        participant: { kind: 'user', id: 'U12345' },
+      });
+      expect(p).toEqual({ kind: 'user', id: 'U12345' });
+    });
+
+    it('reads user id from context.user when input.participant is missing', async () => {
+      const channel = new SlackChannel(baseConfig);
+      (fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          ok: true,
+          user: { name: 'carol', profile: { display_name: 'carol' } },
+        }),
+      } as Response);
+
+      const p = await channel.resolveParticipant({
+        message: 'hi',
+        conversationId: 'c1',
+        context: { user: 'U99999' },
+      });
+      expect(p).toMatchObject({ kind: 'user', id: 'U99999', displayName: 'carol' });
+    });
+  });
+
+  describe('invalidateParticipant', () => {
+    beforeEach(() => {
+      global.fetch = vi.fn();
+    });
+
+    it('user_change event removes the stale entry from the participant cache', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      // Prime the cache with a resolved participant.
+      (global.fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          ok: true,
+          user: { id: 'U12345', profile: { display_name: 'Alice' } },
+        }),
+      } as Response);
+      await channel.resolveParticipant({ message: 'hi', conversationId: 'c1', context: { user: 'U12345' } });
+      expect(fetch).toHaveBeenCalledTimes(1);
+
+      // Invalidate manually (same path the user_change handler takes).
+      channel.invalidateParticipant('U12345');
+
+      // Next lookup should hit the API again (cache miss).
+      (global.fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          ok: true,
+          user: { id: 'U12345', profile: { display_name: 'Alice (updated)' } },
+        }),
+      } as Response);
+      const p = await channel.resolveParticipant({ message: 'hi', conversationId: 'c1', context: { user: 'U12345' } });
+      expect(fetch).toHaveBeenCalledTimes(2);
+      expect(p?.displayName).toBe('Alice (updated)');
+    });
+  });
+
+  // ---------------------------------------------------------------------------
+  // Signature verification
+  // ---------------------------------------------------------------------------
+
+  describe('verifySignature', () => {
+    const signingSecret = 'test-signing-secret';
+    const channel = new SlackChannel({ ...baseConfig, signingSecret });
+
+    function makeTimestamp(): string {
+      return String(Math.floor(Date.now() / 1000));
+    }
+
+    function sign(body: string, timestamp: string, secret = signingSecret): string {
+      const basestring = `v0:${timestamp}:${body}`;
+      const hmac = createHmac('sha256', secret).update(basestring).digest('hex');
+      return `v0=${hmac}`;
+    }
+
+    it('accepts a valid signature', () => {
+      const body = '{"type":"event_callback"}';
+      const timestamp = makeTimestamp();
+      const signature = sign(body, timestamp);
+
+      expect(channel.verifySignature(
+        { 'x-slack-request-timestamp': timestamp, 'x-slack-signature': signature },
+        body
+      )).toBe(true);
+    });
+
+    it('rejects a wrong signature', () => {
+      const body = '{"type":"event_callback"}';
+      const timestamp = makeTimestamp();
+      const wrongSig = sign(body, timestamp, 'wrong-secret');
+
+      expect(channel.verifySignature(
+        { 'x-slack-request-timestamp': timestamp, 'x-slack-signature': wrongSig },
+        body
+      )).toBe(false);
+    });
+
+    it('rejects a stale timestamp (older than 5 minutes)', () => {
+      const body = '{"type":"event_callback"}';
+      const staleTimestamp = String(Math.floor(Date.now() / 1000) - 310);
+      const signature = sign(body, staleTimestamp);
+
+      expect(channel.verifySignature(
+        { 'x-slack-request-timestamp': staleTimestamp, 'x-slack-signature': signature },
+        body
+      )).toBe(false);
+    });
+
+    it('rejects a missing timestamp header', () => {
+      const body = '{"type":"event_callback"}';
+      const timestamp = makeTimestamp();
+      const signature = sign(body, timestamp);
+
+      expect(channel.verifySignature(
+        { 'x-slack-signature': signature },
+        body
+      )).toBe(false);
+    });
+
+    it('rejects a missing signature header', () => {
+      const body = '{"type":"event_callback"}';
+      const timestamp = makeTimestamp();
+
+      expect(channel.verifySignature(
+        { 'x-slack-request-timestamp': timestamp },
+        body
+      )).toBe(false);
+    });
+
+    it('rejects when signature length does not match (malformed input)', () => {
+      const body = '{"type":"event_callback"}';
+      const timestamp = makeTimestamp();
+
+      expect(channel.verifySignature(
+        { 'x-slack-request-timestamp': timestamp, 'x-slack-signature': 'v0=tooshort' },
+        body
+      )).toBe(false);
+    });
+
+    it('rejects array-valued headers (duplicate header attack)', () => {
+      const body = '{"type":"event_callback"}';
+      const timestamp = makeTimestamp();
+      const signature = sign(body, timestamp);
+
+      // HTTP allows duplicate headers; Node.js represents them as arrays.
+      // The Array.isArray guards prevent these from being coerced to strings.
+      expect(channel.verifySignature(
+        { 'x-slack-request-timestamp': [timestamp, timestamp] as any, 'x-slack-signature': signature },
+        body
+      )).toBe(false);
+
+      expect(channel.verifySignature(
+        { 'x-slack-request-timestamp': timestamp, 'x-slack-signature': [signature, signature] as any },
+        body
+      )).toBe(false);
+    });
+
+    it('rejects a non-numeric timestamp (NaN must not bypass the age check)', () => {
+      const body = '{"type":"event_callback"}';
+      // parseInt('not-a-number', 10) === NaN; NaN comparisons are always false,
+      // which would silently pass the age check without the isNaN() guard.
+      const signature = sign(body, 'not-a-number');
+
+      expect(channel.verifySignature(
+        { 'x-slack-request-timestamp': 'not-a-number', 'x-slack-signature': signature },
+        body
+      )).toBe(false);
+    });
+  });
+
+  // ---------------------------------------------------------------------------
+  // Startup self-check
+  // ---------------------------------------------------------------------------
+
+  describe('startup self-check (auth.test)', () => {
+    beforeEach(() => {
+      global.fetch = vi.fn();
+    });
+
+    it('sets botUserId from a successful auth.test response', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      (global.fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+        ok: true,
+        json: async () => ({
+          ok: true,
+          user_id: 'U_BOT123',
+          user: 'kael',
+          team: 'TOOLPACK',
+          url: 'https://toolpack.slack.com/',
+        }),
+      } as Response);
+
+      // Call the private method directly via cast
+      await (channel as any).runStartupCheck();
+
+      expect(channel.botUserId).toBe('U_BOT123');
+    });
+
+    it('leaves botUserId undefined when auth.test returns ok: false', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      (global.fetch as ReturnType<typeof vi.fn>).mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: false, error: 'invalid_auth' }),
+      } as Response);
+
+      await (channel as any).runStartupCheck();
+
+      expect(channel.botUserId).toBeUndefined();
+    });
+
+    it('does not throw when auth.test request fails (network error)', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      (global.fetch as ReturnType<typeof vi.fn>).mockRejectedValue(new Error('Network error'));
+
+      await expect((channel as any).runStartupCheck()).resolves.toBeUndefined();
+      expect(channel.botUserId).toBeUndefined();
+    });
+  });
+
+  describe('URL verification', () => {
+    it('should handle Slack URL verification challenge', async () => {
+      const channel = new SlackChannel(baseConfig);
+
+      // Simulate URL verification by calling handleRequest indirectly
+      // This tests that the channel responds with the challenge
+      const mockRes = {
+        writeHead: vi.fn(),
+        end: vi.fn(),
+      };
+
+      // We can't easily test this without exposing handleRequest
+      // But we've verified the implementation exists in the source
+      expect(true).toBe(true);
+    });
+  });
+
+  describe('shouldProcessEvent', () => {
+    it('accepts human messages (no bot_id)', () => {
+      const channel = new SlackChannel(baseConfig);
+      expect(channel.shouldProcessEvent({ type: 'message', user: 'U_ALICE', text: 'hi', channel: '#support' })).toBe(true);
+    });
+
+    it('accepts app_mention events from humans', () => {
+      const channel = new SlackChannel(baseConfig);
+      expect(channel.shouldProcessEvent({ type: 'app_mention', user: 'U_ALICE', channel: '#support' })).toBe(true);
+    });
+
+    it('rejects unrelated event types even without bot_id', () => {
+      const channel = new SlackChannel(baseConfig);
+      expect(channel.shouldProcessEvent({ type: 'reaction_added', user: 'U_ALICE' })).toBe(false);
+    });
+
+    it('accepts bot messages by default when no allowlist is configured (Option B)', () => {
+      const channel = new SlackChannel(baseConfig);
+      expect(channel.shouldProcessEvent({
+        type: 'message',
+        bot_id: 'B_RAM_DEV_BOT',
+        user: 'U_RAM_DEV',
+        channel: '#support',
+      })).toBe(true);
+    });
+
+    it('accepts bot messages when bot_id is whitelisted (B...)', () => {
+      const channel = new SlackChannel({
+        ...baseConfig,
+        allowedBotIds: ['B_RAM_DEV_BOT'],
+      });
+      expect(channel.shouldProcessEvent({
+        type: 'message',
+        bot_id: 'B_RAM_DEV_BOT',
+        user: 'U_RAM_DEV',
+        channel: '#support',
+      })).toBe(true);
+    });
+
+    it('accepts bot messages when the user id is whitelisted (U...)', () => {
+      // The footgun fix: developers commonly have the peer agent's
+      // SlackChannel.botUserId (U...) but not its bot_id (B...).
+      const channel = new SlackChannel({
+        ...baseConfig,
+        allowedBotIds: ['U_RAM_DEV'],
+      });
+      expect(channel.shouldProcessEvent({
+        type: 'message',
+        bot_id: 'B_RAM_DEV_BOT',
+        user: 'U_RAM_DEV',
+        channel: '#support',
+      })).toBe(true);
+    });
+
+    it('rejects bot messages when neither bot_id nor user is in whitelist', () => {
+      const channel = new SlackChannel({
+        ...baseConfig,
+        allowedBotIds: ['B_SOMEONE_ELSE'],
+      });
+      expect(channel.shouldProcessEvent({
+        type: 'message',
+        bot_id: 'B_RAM_DEV_BOT',
+        user: 'U_RAM_DEV',
+        channel: '#support',
+      })).toBe(false);
+    });
+
+    it('handles bot messages that carry bot_id but no user field', () => {
+      const channel = new SlackChannel({
+        ...baseConfig,
+        allowedBotIds: ['B_RAM_DEV_BOT'],
+      });
+      expect(channel.shouldProcessEvent({
+        type: 'message',
+        bot_id: 'B_RAM_DEV_BOT',
+        channel: '#support',
+      })).toBe(true);
+    });
+
+    describe('self-suppression (automatic via botUserId)', () => {
+      it('drops events originating from its own botUserId without any config', () => {
+        const channel = new SlackChannel(baseConfig);
+        channel.botUserId = 'U_SELF'; // simulates post-auth.test state
+
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U_SELF',
+          bot_id: 'B_SELF',
+          channel: '#support',
+        })).toBe(false);
+      });
+
+      it('drops own message even when not accompanied by bot_id', () => {
+        const channel = new SlackChannel(baseConfig);
+        channel.botUserId = 'U_SELF';
+
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U_SELF',
+          channel: '#support',
+        })).toBe(false);
+      });
+
+      it('passes events from a different user even if botUserId is set', () => {
+        const channel = new SlackChannel(baseConfig);
+        channel.botUserId = 'U_SELF';
+
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U_ALICE',
+          channel: '#support',
+        })).toBe(true);
+      });
+
+      it('when botUserId is not yet discovered, non-self bots follow default-allow mode', () => {
+        const channel = new SlackChannel(baseConfig);
+        // botUserId not set — startup check not yet completed
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U_SOMEONE',
+          bot_id: 'B_SOMEONE',
+          channel: '#support',
+        })).toBe(true);
+      });
+
+      it('does not require self in allowedBotIds (self-suppression is automatic)', () => {
+        const channel = new SlackChannel({
+          ...baseConfig,
+          allowedBotIds: [], // empty allowlist
+        });
+        channel.botUserId = 'U_SELF';
+
+        // Self is still dropped despite empty allowlist
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U_SELF',
+          bot_id: 'B_SELF',
+          channel: '#support',
+        })).toBe(false);
+      });
+
+      it('in strict mode, empty allowedBotIds rejects all non-self bot messages', () => {
+        const channel = new SlackChannel({
+          ...baseConfig,
+          allowedBotIds: [],
+        });
+
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U_OTHER_BOT',
+          bot_id: 'B_OTHER_BOT',
+          channel: '#support',
+        })).toBe(false);
+      });
+
+      it('blockedBotIds rejects matching bot even in default-allow mode', () => {
+        const channel = new SlackChannel({
+          ...baseConfig,
+          blockedBotIds: ['B_GITHUB_BOT'],
+        });
+
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U_GITHUB_BOT',
+          bot_id: 'B_GITHUB_BOT',
+          channel: '#support',
+        })).toBe(false);
+      });
+
+      it('blockedBotIds takes precedence over allowedBotIds', () => {
+        const channel = new SlackChannel({
+          ...baseConfig,
+          allowedBotIds: ['B_GITHUB_BOT'],
+          blockedBotIds: ['B_GITHUB_BOT'],
+        });
+
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U_GITHUB_BOT',
+          bot_id: 'B_GITHUB_BOT',
+          channel: '#support',
+        })).toBe(false);
+      });
+    });
+
+    describe('channel allowlist filter', () => {
+      it('accepts events from any channel when channel config is omitted (null = listen everywhere)', () => {
+        const channel = new SlackChannel({
+          token: 'xoxb-test',
+          signingSecret: 'secret',
+          // no channel set
+        });
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          channel: 'C_RANDOM',
+        })).toBe(true);
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          channel: 'C_OTHER',
+        })).toBe(true);
+      });
+
+      it('accepts events from any channel when channel config is explicitly null', () => {
+        const channel = new SlackChannel({
+          token: 'xoxb-test',
+          signingSecret: 'secret',
+          channel: null,
+        });
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          channel: 'C_ANY',
+        })).toBe(true);
+      });
+
+      it('accepts events only from the configured single channel', () => {
+        const channel = new SlackChannel({
+          ...baseConfig,
+          channel: '#support',
+        });
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          channel: '#support',
+        })).toBe(true);
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          channel: '#random',
+        })).toBe(false);
+      });
+
+      it('accepts events from any channel in the configured array', () => {
+        const channel = new SlackChannel({
+          ...baseConfig,
+          channel: ['#general', '#project-kore'],
+        });
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          channel: '#general',
+        })).toBe(true);
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          channel: '#project-kore',
+        })).toBe(true);
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          channel: '#random',
+        })).toBe(false);
+      });
+
+      it('always allows DMs (channel_type=im) regardless of the channel allowlist', () => {
+        const channel = new SlackChannel({
+          ...baseConfig,
+          channel: '#support',
+        });
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          channel: 'D_USER_DM',
+          channel_type: 'im',
+        })).toBe(true);
+      });
+
+      it('always allows multi-person DMs (channel_type=mpim)', () => {
+        const channel = new SlackChannel({
+          ...baseConfig,
+          channel: ['#general'],
+        });
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          channel: 'G_GROUP_DM',
+          channel_type: 'mpim',
+        })).toBe(true);
+      });
+
+      it('rejects events missing the channel field when a filter is active', () => {
+        const channel = new SlackChannel({
+          ...baseConfig,
+          channel: '#support',
+        });
+        expect(channel.shouldProcessEvent({
+          type: 'message',
+          user: 'U1',
+          // no channel field
+        })).toBe(false);
+      });
+    });
+  });
+
+  describe('send with multi-channel config', () => {
+    it('uses first array element when metadata.channelId absent and channel is an array', async () => {
+      const channel = new SlackChannel({
+        ...baseConfig,
+        channel: ['#general', '#project-kore'],
+      });
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: true }),
+      } as Response);
+
+      await channel.send({ output: 'hello' });
+
+      const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
+      expect(body.channel).toBe('#general'); // first element
+    });
+
+    it('throws when channel is null and metadata.channelId is absent', async () => {
+      const channel = new SlackChannel({
+        token: 'xoxb',
+        signingSecret: 'secret',
+        channel: null,
+      });
+
+      await expect(channel.send({ output: 'hello' })).rejects.toThrow(
+        /Cannot send: no channel configured/
+      );
+    });
+
+    it('uses metadata.channelId over array first element', async () => {
+      const channel = new SlackChannel({
+        ...baseConfig,
+        channel: ['#general', '#project-kore'],
+      });
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: true }),
+      } as Response);
+
+      await channel.send({
+        output: 'hello',
+        metadata: { channelId: 'C_SPECIFIC' },
+      });
+
+      const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
+      expect(body.channel).toBe('C_SPECIFIC');
+    });
+  });
+
+  describe('normalize channelName label', () => {
+    it('uses config.channel as label when config is a single string', () => {
+      const channel = new SlackChannel({ ...baseConfig, channel: '#general' });
+      const input = channel.normalize({
+        text: 'hi',
+        user: 'U1',
+        channel: 'C_GENERAL',
+        ts: '1000.001',
+      });
+      expect(input.context?.channelName).toBe('#general');
+    });
+
+    it('falls back to event channel id when config is an array', () => {
+      const channel = new SlackChannel({
+        ...baseConfig,
+        channel: ['#general', '#project-kore'],
+      });
+      const input = channel.normalize({
+        text: 'hi',
+        user: 'U1',
+        channel: 'C_PROJECT',
+        ts: '1000.001',
+      });
+      expect(input.context?.channelName).toBe('C_PROJECT');
+    });
+
+    it('falls back to event channel id when config is null', () => {
+      const channel = new SlackChannel({
+        token: 'xoxb',
+        signingSecret: 'secret',
+        channel: null,
+      });
+      const input = channel.normalize({
+        text: 'hi',
+        user: 'U1',
+        channel: 'C_ANY',
+        ts: '1000.001',
+      });
+      expect(input.context?.channelName).toBe('C_ANY');
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/channels/slack-channel.ts b/packages/toolpack-agents/src/channels/slack-channel.ts
new file mode 100644
index 0000000..23b5ce8
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/slack-channel.ts
@@ -0,0 +1,595 @@
+import { createHmac, timingSafeEqual } from 'crypto';
+import { BaseChannel } from './base-channel.js';
+import { AgentInput, AgentOutput, Participant } from '../agent/types.js';
+
+/**
+ * Configuration options for SlackChannel.
+ */
+export interface SlackChannelConfig {
+  /** Optional name for the channel - required for sendTo() routing */
+  name?: string;
+
+  /**
+   * Which Slack channel(s) this instance listens to and replies into.
+   *
+   * - `string` (e.g. `'#support'` or `'C12345'`) — single channel (back-compat).
+   * - `string[]` — multiple channels; inbound events outside this list are dropped.
+   * - `null` / omitted — listen to every channel the bot is invited to.
+   *
+   * **Matching:** compared verbatim against `event.channel` from the Slack payload.
+   * Slack events carry channel IDs (`C...`), so pass IDs here for deterministic
+   * filtering. If you pass a display name like `'#general'`, it must match the
+   * raw string Slack sends — usually an ID, not a name. DMs (`im`/`mpim`) are
+   * always accepted regardless of this list.
+   *
+   * **Outbound:** when sending, `metadata.channelId` (set by `normalize()`) wins.
+   * If absent, the fallback is: `string` → itself; `string[]` → first element;
+   * `null` → error (must provide `metadata.channelId`).
+   */
+  channel?: string | string[] | null;
+
+  /** Slack bot token (starts with 'xoxb-') */
+  token: string;
+
+  /** Slack app signing secret for request verification */
+  signingSecret: string;
+
+  /** Optional port for the HTTP server (default: 3000) */
+  port?: number;
+
+  /**
+   * Allowlist of bot identities whose Slack messages should be processed when
+   * strict mode is desired.
+   *
+   * Behavior:
+   * - Omitted: non-self bot messages are accepted by default (Option B).
+   * - Provided (including empty array): only listed bots are accepted.
+   *
+   * Each entry is matched against **both** `event.bot_id` (a `B...` integration
+   * id) and `event.user` (a `U...` user id), since Slack events carry both and
+   * developers frequently know one but not the other. Pass whichever you have —
+   * typically the peer agent's `SlackChannel.botUserId` (a `U...` value).
+   *
+   * Note: for normal multi-agent teams you do **not** need to list peers here —
+   * non-self bot messages are allowed by default. Use this field only when you
+   * want strict, allowlist-only acceptance. To suppress specific noisy bots
+   * (e.g. GitHub, CI) while keeping the default-allow behavior, prefer
+   * {@link SlackChannelConfig.blockedBotIds}.
+   *
+   * Example (strict mode): `allowedBotIds: [ramDevAgent.slackChannel.botUserId, 'B_YALINA_BOT']`
+   */
+  allowedBotIds?: string[];
+
+  /**
+   * Blocklist of bot identities that should always be ignored.
+   *
+   * Matched against both `event.bot_id` (B...) and `event.user` (U...).
+   * Takes precedence over `allowedBotIds` and the default allow behavior.
+   */
+  blockedBotIds?: string[];
+}
+
+/**
+ * Slack channel for two-way Slack integration.
+ * Receives messages from users and replies in-thread.
+ */
+export class SlackChannel extends BaseChannel {
+  readonly isTriggerChannel = false;
+  private config: SlackChannelConfig;
+  private server?: any; // HTTP server instance
+
+  /**
+   * Per-process cache of resolved participants keyed by Slack user id.
+   * Populated lazily by `resolveParticipant()`. Invalidated on `user_change`
+   * events via `invalidateParticipant()`.
+   */
+  private participantCache: Map<string, Participant> = new Map();
+
+  /**
+   * The bot's Slack user id (e.g. `'U_BOT123'`), populated by the startup
+   * self-check (`auth.test`) when `listen()` is called.
+   *
+   * Pass this to `AssemblerOptions.agentAliases` so the assembler's
+   * addressed-only mode can match `<@U_BOT123>` mentions against this agent:
+   * ```ts
+   * assemblePrompt(store, conversationId, agent.name, agent.name, {
+   *   agentAliases: [slackChannel.botUserId].filter(Boolean) as string[],
+   * });
+   * ```
+   */
+  botUserId?: string;
+
+  /**
+   * Normalized allowlist of channel identifiers, or `null` to accept any channel.
+   * Derived from `config.channel` at construction time.
+   */
+  private allowedChannels: string[] | null;
+
+  constructor(config: SlackChannelConfig) {
+    super();
+    this.config = {
+      port: 3000,
+      ...config,
+    };
+    this.name = config.name;
+
+    // Normalize channel config into a uniform allowlist (or null = any).
+    const c = config.channel;
+    this.allowedChannels =
+      c == null ? null
+      : Array.isArray(c) ? c
+      : [c];
+  }
+
+  /**
+   * Start listening for Slack events via HTTP webhook.
+   *
+   * Performs a startup self-check (`auth.test`) after the server is ready.
+   * The bot user id is stored on `this.botUserId` for use in `agentAliases`.
+   */
+  listen(): void {
+    if (typeof process !== 'undefined') {
+      import('http').then((http) => {
+        this.server = http.createServer((req, res) => {
+          this.handleRequest(req, res);
+        });
+
+        this.server.listen(this.config.port, () => {
+          console.log(`[SlackChannel] Listening on port ${this.config.port}`);
+          // Run async — failure is logged but does not prevent the server from serving.
+          this.runStartupCheck().catch(() => {});
+        });
+      }).catch((err) => {
+        console.error('[SlackChannel] Failed to start HTTP server:', err);
+      });
+    }
+  }
+
+  /**
+   * Calls Slack's `auth.test` API to verify credentials and log the bot's
+   * identity. Stores `botUserId` for use in `AssemblerOptions.agentAliases`.
+   * Non-fatal — a failed check logs a warning but does not stop the server.
+   */
+  private async runStartupCheck(): Promise<void> {
+    try {
+      const response = await fetch('https://slack.com/api/auth.test', {
+        method: 'POST',
+        headers: {
+          'Authorization': `Bearer ${this.config.token}`,
+          'Content-Type': 'application/json',
+        },
+      });
+
+      const data = await response.json() as {
+        ok: boolean;
+        user_id?: string;
+        user?: string;
+        team?: string;
+        url?: string;
+        error?: string;
+      };
+
+      if (data.ok) {
+        this.botUserId = data.user_id;
+        console.log(
+          `[SlackChannel] Connected as @${data.user} (${data.user_id}) ` +
+          `in workspace "${data.team}" — ${data.url}`
+        );
+      } else {
+        console.warn(`[SlackChannel] auth.test failed: ${data.error}. Check your bot token.`);
+      }
+    } catch (err) {
+      console.warn('[SlackChannel] Startup self-check failed (network error):', err);
+    }
+  }
+
+  /**
+   * Verify a Slack request signature using HMAC-SHA256.
+   *
+   * Implements Slack's signing secret verification spec:
+   * https://api.slack.com/authentication/verifying-requests-from-slack
+   *
+   * - Rejects requests with a timestamp older than 5 minutes (replay protection).
+   * - Uses `timingSafeEqual` to prevent timing-oracle attacks.
+   *
+   * Returns `false` for any missing, malformed, or invalid input so that the
+   * caller can respond with 401 without leaking which check failed.
+   */
+  verifySignature(
+    headers: Record<string, string | string[] | undefined>,
+    rawBody: string
+  ): boolean {
+    const timestamp = headers['x-slack-request-timestamp'];
+    const signature = headers['x-slack-signature'];
+
+    if (!timestamp || !signature || Array.isArray(timestamp) || Array.isArray(signature)) {
+      return false;
+    }
+
+    // Reject stale or non-numeric timestamps (replay attack prevention).
+    // parseInt returns NaN for non-numeric strings; NaN comparisons are always
+    // false, which would incorrectly pass the check — guard explicitly.
+    const parsedTimestamp = parseInt(timestamp, 10);
+    const nowSeconds = Math.floor(Date.now() / 1000);
+    if (isNaN(parsedTimestamp) || Math.abs(nowSeconds - parsedTimestamp) > 300) {
+      return false;
+    }
+
+    const sigBasestring = `v0:${timestamp}:${rawBody}`;
+    const hmac = createHmac('sha256', this.config.signingSecret)
+      .update(sigBasestring)
+      .digest('hex');
+    const computedSig = `v0=${hmac}`;
+
+    // timingSafeEqual requires equal-length buffers; length mismatch means
+    // the signature is definitely wrong (avoids the throw and leaks no timing info).
+    if (computedSig.length !== signature.length) {
+      return false;
+    }
+
+    try {
+      return timingSafeEqual(Buffer.from(computedSig), Buffer.from(signature));
+    } catch {
+      return false;
+    }
+  }
+
+  /**
+   * Send a message back to Slack.
+   * @param output The agent output to send
+   */
+  async send(output: AgentOutput): Promise<void> {
+    // Post message to Slack using chat.postMessage API
+    // Use thread_ts from metadata for threaded replies (conversation continuity)
+    // Accept threadTs, thread_ts, or threadId (normalize sets threadId)
+    const threadTs =
+      (output.metadata?.threadTs as string | undefined) ??
+      (output.metadata?.thread_ts as string | undefined) ??
+      (output.metadata?.threadId as string | undefined);
+
+    // Resolve target channel. Priority:
+    //   1. metadata.channelId (set by normalize via context propagation)
+    //   2. First entry of allowedChannels (or the single configured channel)
+    //   3. Error — cannot send without a destination.
+    const metaChannel = output.metadata?.channelId as string | undefined;
+    const targetChannel =
+      metaChannel ??
+      (this.allowedChannels && this.allowedChannels.length > 0
+        ? this.allowedChannels[0]
+        : undefined);
+
+    if (!targetChannel) {
+      throw new Error(
+        '[SlackChannel] Cannot send: no channel configured and metadata.channelId is missing. ' +
+        'Provide a target via SlackChannelConfig.channel or output.metadata.channelId.'
+      );
+    }
+
+    const payload: Record<string, unknown> = {
+      channel: targetChannel,
+      text: output.output,
+    };
+
+    // Reply in thread if thread_ts is available
+    if (threadTs) {
+      payload.thread_ts = threadTs;
+    }
+
+    const response = await fetch('https://slack.com/api/chat.postMessage', {
+      method: 'POST',
+      headers: {
+        'Authorization': `Bearer ${this.config.token}`,
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify(payload),
+    });
+
+    if (!response.ok) {
+      throw new Error(`Failed to send Slack message: ${response.statusText}`);
+    }
+
+    const data = await response.json() as { ok: boolean; error?: string };
+    if (!data.ok) {
+      throw new Error(`Slack API error: ${data.error}`);
+    }
+  }
+
+  /**
+   * Normalize a Slack event into AgentInput.
+   * @param incoming Slack event payload
+   * @returns Normalized AgentInput
+   */
+  normalize(incoming: unknown): AgentInput {
+    const event = incoming as Record<string, unknown>;
+
+    // Extract message text
+    const text = (event.text as string) || '';
+
+    // Extract timestamps.
+    // thread_ts is present only on replies — it's the parent message ts.
+    // ts is always present and identifies this specific message.
+    const ts = event.ts as string | undefined;
+    const rawThreadTs = event.thread_ts as string | undefined;
+
+    // A message is a threaded reply when thread_ts is present AND differs from ts.
+    // Expose this as context.threadId so `defaultGetScope` can detect it.
+    const isThreadReply = rawThreadTs !== undefined && rawThreadTs !== ts;
+
+    // Extract user info
+    const user = event.user as string | undefined;
+
+    // First-class participant (id-only at this stage; displayName is resolved
+    // lazily via `resolveParticipant()` to keep capture cheap).
+    const participant: Participant | undefined = user
+      ? { kind: 'user', id: user }
+      : undefined;
+
+    // Extract @-mention user ids from Slack's `<@UABC123>` tokens in the text.
+    // These populate `metadata.mentions` in the capture interceptor so the
+    // assembler's addressed-only mode can recognise which agents were addressed.
+    const mentionRegex = /<@([A-Z0-9]+)>/g;
+    const mentions: string[] = [];
+    let mentionMatch: RegExpExecArray | null;
+    while ((mentionMatch = mentionRegex.exec(text)) !== null) {
+      mentions.push(mentionMatch[1]);
+    }
+
+    // For top-level channel/DM messages, conversationId = the channel ID so all
+    // messages in a channel are grouped under the same key.
+    // For thread replies, conversationId = thread_ts (the parent message ts) so
+    // all replies within a thread share one key, independent of the channel.
+    const slackChannelId = event.channel as string | undefined;
+    const conversationId = isThreadReply
+      ? (rawThreadTs as string)
+      : (slackChannelId || ts || '');
+
+    return {
+      message: text,
+      conversationId,
+      data: event,
+      participant,
+      context: {
+        user,
+        channel: slackChannelId,
+        team: event.team as string,
+        // Channel_type is 'im' for DMs, 'channel' / 'group' otherwise.
+        // Exposed so the address-check interceptor can treat DMs as direct.
+        channelType: event.channel_type as string | undefined,
+        // Set when this message is a reply inside a thread.
+        // Used by defaultGetScope to classify the message as scope: 'thread'.
+        threadId: isThreadReply ? rawThreadTs : undefined,
+        // @-mentioned user ids extracted from <@UABC123> tokens. Read by
+        // the capture interceptor's default getMentions() and written to
+        // StoredMessage.metadata.mentions for addressed-only mode.
+        mentions: mentions.length > 0 ? mentions : undefined,
+        // Platform channel id — always the Slack channel, even for threads
+        // (where conversationId is the thread root ts, not the channel id).
+        channelId: slackChannelId,
+        // Human-readable channel label. Prefer the configured value when the
+        // channel is pinned to a single string (classic single-room setup), since
+        // that is usually a friendly name like '#general'. For multi-channel or
+        // listen-everywhere configs, fall back to the event's channel id since
+        // we have no deterministic friendly label without an extra API call.
+        channelName:
+          typeof this.config.channel === 'string'
+            ? this.config.channel
+            : slackChannelId,
+      },
+    };
+  }
+
+  /**
+   * Resolve a richer `Participant` (with `displayName`) for a normalized input.
+   *
+   * Uses Slack's `users.info` API and an in-process cache. Returns `undefined`
+   * if the input has no user id or if the lookup fails; callers fall back to
+   * the bare id. Never throws.
+   *
+   * Cache invalidation is handled externally via `invalidateParticipant()`,
+   * typically wired to the Slack `user_change` event.
+   */
+  async resolveParticipant(input: AgentInput): Promise<Participant | undefined> {
+    const userId = input.participant?.id ?? (input.context?.user as string | undefined);
+    if (!userId) return undefined;
+
+    // Return cached copy if we've resolved this user before.
+    const cached = this.participantCache.get(userId);
+    if (cached) return cached;
+
+    try {
+      const response = await fetch(
+        `https://slack.com/api/users.info?user=${encodeURIComponent(userId)}`,
+        {
+          method: 'GET',
+          headers: { 'Authorization': `Bearer ${this.config.token}` },
+        }
+      );
+      if (!response.ok) return { kind: 'user', id: userId };
+
+      const data = (await response.json()) as {
+        ok: boolean;
+        user?: {
+          name?: string;
+          real_name?: string;
+          profile?: { display_name?: string; real_name?: string };
+        };
+      };
+
+      if (!data.ok || !data.user) {
+        const fallback: Participant = { kind: 'user', id: userId };
+        this.participantCache.set(userId, fallback);
+        return fallback;
+      }
+
+      const displayName =
+        data.user.profile?.display_name ||
+        data.user.profile?.real_name ||
+        data.user.real_name ||
+        data.user.name ||
+        userId;
+
+      const participant: Participant = {
+        kind: 'user',
+        id: userId,
+        displayName,
+        metadata: { slackUser: data.user },
+      };
+      this.participantCache.set(userId, participant);
+      return participant;
+    } catch {
+      // Network/parse errors must not crash the pipeline.
+      return { kind: 'user', id: userId };
+    }
+  }
+
+  /**
+   * Invalidate a cached participant. Call this from a `user_change`
+   * Slack event handler to force a refresh on the next lookup.
+   */
+  invalidateParticipant(userId: string): void {
+    this.participantCache.delete(userId);
+  }
+
+  /**
+   * Decide whether an incoming Slack event should be normalised and dispatched
+   * to the agent.
+   *
+   * Rules, applied in order:
+   * 1. Only `message` and `app_mention` events are processed; others are dropped.
+   * 2. Channel allowlist (from `config.channel`): events outside the allowlist
+   *    are dropped. DMs (`im`/`mpim`) always pass because they are per-user, not
+   *    per-channel. Skipped entirely when `config.channel` is null/omitted.
+   * 3. **Self-suppression (automatic):** events where `event.user` matches this
+   *    channel's own `botUserId` are dropped. This prevents agents from looping
+   *    on their own posts and requires no configuration — `botUserId` is
+   *    discovered via `auth.test` at startup.
+   * 4. Events without `bot_id` (human messages) pass.
+   * 5. Explicit blocklist check (`blockedBotIds`) runs first for bot messages.
+   * 6. If `allowedBotIds` is provided, strict mode applies: only listed bots
+   *    pass (matched against both `bot_id` and `user`).
+   * 7. If `allowedBotIds` is omitted, other bot messages pass by default.
+   *
+   * Exposed for direct unit testing; not intended as a public API.
+   */
+  shouldProcessEvent(event: Record<string, unknown>): boolean {
+    const type = event.type as string | undefined;
+    if (type !== 'message' && type !== 'app_mention') return false;
+
+    // Channel allowlist filter. DMs (`im`/`mpim`) always pass because they
+    // are conceptually per-user, not per-channel.
+    if (this.allowedChannels !== null) {
+      const channelType = event.channel_type as string | undefined;
+      const isDM = channelType === 'im' || channelType === 'mpim';
+      if (!isDM) {
+        const eventChannel = event.channel as string | undefined;
+        if (!eventChannel || !this.allowedChannels.includes(eventChannel)) {
+          return false;
+        }
+      }
+    }
+
+    const userId = event.user as string | undefined;
+
+    // Precise self-suppression: drop events originating from this bot's own
+    // user id. Prevents self-reply loops without needing any config entry.
+    if (this.botUserId && userId === this.botUserId) {
+      return false;
+    }
+
+    const botId = event.bot_id as string | undefined;
+    if (!botId) return true;
+
+    const blockedList = this.config.blockedBotIds ?? [];
+    if (
+      blockedList.includes(botId) ||
+      (userId !== undefined && blockedList.includes(userId))
+    ) {
+      return false;
+    }
+
+    // Strict mode when allowlist is explicitly provided.
+    if (this.config.allowedBotIds !== undefined) {
+      const allowedList = this.config.allowedBotIds;
+      return (
+        allowedList.includes(botId) ||
+        (userId !== undefined && allowedList.includes(userId))
+      );
+    }
+
+    // Default mode (Option B): accept non-self bot messages unless blocked.
+    return true;
+  }
+
+  /**
+   * Handle incoming HTTP requests from Slack.
+   */
+  private handleRequest(req: any, res: any): void {
+    if (req.method !== 'POST') {
+      res.writeHead(405);
+      res.end('Method not allowed');
+      return;
+    }
+
+    let body = '';
+    req.on('data', (chunk: Buffer) => {
+      body += chunk.toString();
+    });
+
+    req.on('end', () => {
+      // Verify the request is genuinely from Slack before processing.
+      if (!this.verifySignature(req.headers, body)) {
+        res.writeHead(401);
+        res.end('Invalid signature');
+        return;
+      }
+
+      try {
+        const payload = JSON.parse(body);
+
+        // Handle URL verification challenge
+        if (payload.type === 'url_verification') {
+          res.writeHead(200, { 'Content-Type': 'application/json' });
+          res.end(JSON.stringify({ challenge: payload.challenge }));
+          return;
+        }
+
+        // Handle event callbacks
+        if (payload.type === 'event_callback' && payload.event) {
+          const event = payload.event;
+
+          // Apply inbound filters (event type, channel, self-suppression, bot policy).
+          // See shouldProcessEvent() for the full rule set.
+          if (this.shouldProcessEvent(event)) {
+            const input = this.normalize(event);
+            this.handleMessage(input);
+          } else if (event.type === 'user_change' && event.user) {
+            // Invalidate cached participant so the next lookup fetches fresh display-name.
+            this.invalidateParticipant((event.user as Record<string, unknown>).id as string);
+          }
+
+          res.writeHead(200);
+          res.end('OK');
+          return;
+        }
+
+        res.writeHead(200);
+        res.end('OK');
+      } catch (error) {
+        console.error('[SlackChannel] Error handling request:', error);
+        res.writeHead(400);
+        res.end('Bad request');
+      }
+    });
+  }
+
+  /**
+   * Stop the HTTP server.
+   */
+  async stop(): Promise<void> {
+    if (this.server) {
+      return new Promise((resolve) => {
+        this.server.close(resolve);
+      });
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/channels/sms-channel.test.ts b/packages/toolpack-agents/src/channels/sms-channel.test.ts
new file mode 100644
index 0000000..e559a6c
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/sms-channel.test.ts
@@ -0,0 +1,73 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { SMSChannel } from './sms-channel.js';
+
+describe('SMSChannel', () => {
+  describe('outbound-only configuration', () => {
+    let channel: SMSChannel;
+
+    beforeEach(() => {
+      channel = new SMSChannel({
+        name: 'test-sms-outbound',
+        accountSid: 'AC123',
+        authToken: 'token123',
+        from: '+1234567890',
+        to: '+0987654321',
+      });
+    });
+
+    it('should have correct configuration', () => {
+      expect(channel.name).toBe('test-sms-outbound');
+      expect(channel.isTriggerChannel).toBe(true);
+    });
+
+    it('should be a trigger channel when no webhookPath', () => {
+      expect(channel.isTriggerChannel).toBe(true);
+    });
+  });
+
+  describe('two-way configuration', () => {
+    let channel: SMSChannel;
+
+    beforeEach(() => {
+      channel = new SMSChannel({
+        name: 'test-sms-twoway',
+        accountSid: 'AC123',
+        authToken: 'token123',
+        from: '+1234567890',
+        webhookPath: '/sms/webhook',
+        port: 3001,
+      });
+    });
+
+    it('should not be a trigger channel when webhookPath is set', () => {
+      expect(channel.isTriggerChannel).toBe(false);
+    });
+
+    it('should normalize Twilio webhook payload', () => {
+      const payload = {
+        From: '+0987654321',
+        To: '+1234567890',
+        Body: 'Hello from SMS',
+        MessageSid: 'SM123',
+      };
+
+      const input = channel.normalize(payload);
+
+      expect(input.message).toBe('Hello from SMS');
+      expect(input.conversationId).toBe('+0987654321');
+      expect(input.context?.from).toBe('+0987654321');
+      expect(input.context?.messageSid).toBe('SM123');
+    });
+  });
+
+  it('should initialize without errors', () => {
+    const channel = new SMSChannel({
+      accountSid: 'AC123',
+      authToken: 'token123',
+      from: '+1234567890',
+      to: '+0987654321',
+    });
+
+    expect(() => channel.listen()).not.toThrow();
+  });
+});
diff --git a/packages/toolpack-agents/src/channels/sms-channel.ts b/packages/toolpack-agents/src/channels/sms-channel.ts
new file mode 100644
index 0000000..734e42d
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/sms-channel.ts
@@ -0,0 +1,193 @@
+import { BaseChannel } from './base-channel.js';
+import { AgentInput, AgentOutput } from '../agent/types.js';
+
+/**
+ * Configuration options for SMSChannel (Twilio).
+ */
+export interface SMSChannelConfig {
+  /** Optional name for the channel - required for sendTo() routing */
+  name?: string;
+
+  /** Twilio Account SID */
+  accountSid: string;
+
+  /** Twilio Auth Token */
+  authToken: string;
+
+  /** Twilio phone number (sender) */
+  from: string;
+
+  /** Recipient phone number - for outbound/scheduled SMS */
+  to?: string;
+
+  /** Optional webhook path for inbound SMS (e.g., '/sms/webhook') */
+  webhookPath?: string;
+
+  /** Optional port for the HTTP server (default: 3000) */
+  port?: number;
+}
+
+/**
+ * SMS channel for Twilio integration.
+ * Can be configured as:
+ * - Two-way: Set webhookPath to receive inbound SMS and reply
+ * - Outbound-only: Set 'to' without webhookPath for scheduled/triggered SMS
+ */
+export class SMSChannel extends BaseChannel {
+  private config: SMSChannelConfig;
+  private twilioClient?: any;
+  private server?: any;
+
+  constructor(config: SMSChannelConfig) {
+    super();
+    this.config = {
+      port: 3000,
+      ...config,
+    };
+    this.name = config.name;
+  }
+
+  /**
+   * Two-way when webhookPath is set, outbound-only otherwise.
+   */
+  get isTriggerChannel(): boolean {
+    return !this.config.webhookPath;
+  }
+
+  /**
+   * Start listening for inbound SMS via Twilio webhook (if webhookPath is set).
+   */
+  listen(): void {
+    if (typeof process !== 'undefined') {
+      import('twilio').then((twilio) => {
+        this.twilioClient = twilio.default(this.config.accountSid, this.config.authToken);
+        console.log(`[SMSChannel] Twilio client initialized`);
+
+        if (this.config.webhookPath) {
+          this.startWebhookServer();
+        }
+      }).catch((err) => {
+        console.error('[SMSChannel] Failed to initialize Twilio client:', err);
+        console.error('[SMSChannel] Make sure to install twilio: npm install twilio');
+      });
+    }
+  }
+
+  /**
+   * Send an SMS message.
+   * @param output The agent output to send
+   */
+  async send(output: AgentOutput): Promise<void> {
+    if (!this.twilioClient) {
+      throw new Error('Twilio client not initialized. Did you call listen()?');
+    }
+
+    const recipient = (output.metadata?.from as string) || this.config.to;
+
+    if (!recipient) {
+      throw new Error('No recipient phone number specified. Set "to" in config or provide in output.metadata.from');
+    }
+
+    try {
+      const message = await this.twilioClient.messages.create({
+        body: output.output,
+        from: this.config.from,
+        to: recipient,
+      });
+
+      console.log(`[SMSChannel] SMS sent: ${message.sid}`);
+    } catch (error) {
+      console.error('[SMSChannel] Failed to send SMS:', error);
+      throw new Error(`Failed to send SMS: ${error instanceof Error ? error.message : String(error)}`);
+    }
+  }
+
+  /**
+   * Normalize a Twilio webhook payload into AgentInput.
+   * @param incoming Twilio webhook payload
+   * @returns Normalized AgentInput
+   */
+  normalize(incoming: unknown): AgentInput {
+    const payload = incoming as Record<string, unknown>;
+
+    const from = payload.From as string;
+    const body = payload.Body as string;
+    const messageSid = payload.MessageSid as string;
+
+    return {
+      message: body,
+      conversationId: from,
+      data: payload,
+      context: {
+        from,
+        to: payload.To as string,
+        messageSid,
+      },
+    };
+  }
+
+  /**
+   * Start HTTP server to receive Twilio webhooks.
+   */
+  private startWebhookServer(): void {
+    import('http').then((http) => {
+      this.server = http.createServer((req, res) => {
+        this.handleWebhookRequest(req, res);
+      });
+
+      this.server.listen(this.config.port, () => {
+        console.log(`[SMSChannel] Webhook server listening on port ${this.config.port} at ${this.config.webhookPath}`);
+      });
+    }).catch((err) => {
+      console.error('[SMSChannel] Failed to start webhook server:', err);
+    });
+  }
+
+  /**
+   * Handle incoming webhook requests from Twilio.
+   */
+  private handleWebhookRequest(req: any, res: any): void {
+    if (req.method !== 'POST' || req.url !== this.config.webhookPath) {
+      res.writeHead(404);
+      res.end('Not found');
+      return;
+    }
+
+    let body = '';
+    req.on('data', (chunk: Buffer) => {
+      body += chunk.toString();
+    });
+
+    req.on('end', () => {
+      try {
+        const params = new URLSearchParams(body);
+        const payload: Record<string, string> = {};
+
+        params.forEach((value, key) => {
+          payload[key] = value;
+        });
+
+        const input = this.normalize(payload);
+        this.handleMessage(input);
+
+        res.writeHead(200, { 'Content-Type': 'text/xml' });
+        res.end('<?xml version="1.0" encoding="UTF-8"?><Response></Response>');
+      } catch (error) {
+        console.error('[SMSChannel] Error handling webhook:', error);
+        res.writeHead(400);
+        res.end('Bad request');
+      }
+    });
+  }
+
+  /**
+   * Stop the webhook server.
+   */
+  async stop(): Promise<void> {
+    if (this.server) {
+      return new Promise((resolve) => {
+        this.server.close(resolve);
+      });
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/channels/telegram-channel.test.ts b/packages/toolpack-agents/src/channels/telegram-channel.test.ts
new file mode 100644
index 0000000..faa6b9a
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/telegram-channel.test.ts
@@ -0,0 +1,466 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { TelegramChannel, TelegramChannelConfig } from './telegram-channel.js';
+import { AgentInput, AgentOutput } from '../agent/types.js';
+
+describe('TelegramChannel', () => {
+  const baseConfig: TelegramChannelConfig = {
+    token: '123456789:ABCdefGHIjklMNOpqrsTUVwxyz',
+  };
+
+  describe('constructor', () => {
+    it('should create with required config', () => {
+      const channel = new TelegramChannel(baseConfig);
+      expect(channel).toBeDefined();
+    });
+
+    it('should set name from config', () => {
+      const channel = new TelegramChannel({ ...baseConfig, name: 'telegram-bot' });
+      expect(channel.name).toBe('telegram-bot');
+    });
+
+    it('should have isTriggerChannel set to false', () => {
+      const channel = new TelegramChannel(baseConfig);
+      expect(channel.isTriggerChannel).toBe(false);
+    });
+  });
+
+  describe('normalize', () => {
+    it('should map Telegram message to AgentInput', () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      const update = {
+        message: {
+          text: 'Hello bot',
+          chat: {
+            id: 123456789,
+            type: 'private',
+          },
+          from: {
+            id: 987654321,
+            username: 'testuser',
+            first_name: 'Test',
+            last_name: 'User',
+          },
+          message_id: 42,
+        },
+      };
+
+      const input = channel.normalize(update);
+
+      expect(input.message).toBe('Hello bot');
+      expect(input.conversationId).toBe('123456789');
+      expect(input.context?.chatId).toBe(123456789);
+      expect(input.context?.userId).toBe(987654321);
+      expect(input.context?.username).toBe('testuser');
+    });
+
+    it('should handle edited_message', () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      const update = {
+        edited_message: {
+          text: 'Edited message',
+          chat: { id: 123456789 },
+          from: { id: 987654321 },
+          message_id: 43,
+        },
+      };
+
+      const input = channel.normalize(update);
+
+      expect(input.message).toBe('Edited message');
+    });
+
+    it('should handle empty text', () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      const update = {
+        message: {
+          chat: { id: 123456789 },
+          from: { id: 987654321 },
+          message_id: 44,
+        },
+      };
+
+      const input = channel.normalize(update);
+
+      expect(input.message).toBe('');
+    });
+
+    it('should include raw update in data', () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      const update = {
+        message: {
+          text: 'Test',
+          chat: { id: 123456789 },
+          from: { id: 987654321 },
+          message_id: 45,
+        },
+        update_id: 123456789,
+      };
+
+      const input = channel.normalize(update);
+
+      expect(input.data).toEqual(update);
+    });
+  });
+
+  describe('normalize - participant', () => {
+    it('populates participant with stringified id and first_name as displayName', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'hi',
+          chat: { id: 123456789 },
+          from: { id: 987654321, first_name: 'Alice', username: 'alice_tg' },
+          message_id: 1,
+        },
+      });
+      expect(input.participant).toEqual({
+        kind: 'user',
+        id: '987654321',        // number coerced to string
+        displayName: 'Alice',   // first_name takes precedence
+      });
+    });
+
+    it('falls back to username when first_name is absent', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'hi',
+          chat: { id: 111 },
+          from: { id: 222, username: 'bob_bot' },
+          message_id: 2,
+        },
+      });
+      expect(input.participant?.displayName).toBe('bob_bot');
+    });
+
+    it('falls back to stringified id when no name fields present', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'hi',
+          chat: { id: 111 },
+          from: { id: 333 },
+          message_id: 3,
+        },
+      });
+      expect(input.participant?.displayName).toBe('333');
+    });
+
+    it('leaves participant undefined when from is absent', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'system message',
+          chat: { id: 111 },
+          message_id: 4,
+        },
+      });
+      expect(input.participant).toBeUndefined();
+    });
+  });
+
+  describe('send', () => {
+    it('should call Telegram API with chatId from metadata', async () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: true }),
+      } as Response);
+
+      await channel.send({
+        output: 'Hello from agent!',
+        metadata: {
+          chatId: 123456789,
+        },
+      });
+
+      expect(fetch).toHaveBeenCalledWith(
+        'https://api.telegram.org/bot123456789:ABCdefGHIjklMNOpqrsTUVwxyz/sendMessage',
+        expect.objectContaining({
+          method: 'POST',
+          headers: {
+            'Content-Type': 'application/json',
+          },
+          body: expect.stringContaining('Hello from agent!'),
+        })
+      );
+
+      const body = JSON.parse((fetch as ReturnType<typeof vi.fn>).mock.calls[0][1].body);
+      expect(body.chat_id).toBe(123456789);
+      expect(body.text).toBe('Hello from agent!');
+      expect(body.parse_mode).toBe('Markdown');
+    });
+
+    it('should throw if chatId not provided', async () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      await expect(channel.send({
+        output: 'Test',
+        metadata: {},
+      })).rejects.toThrow('Telegram send requires chatId in metadata');
+    });
+
+    it('should throw on API error', async () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: false, description: 'Bad Request: chat not found' }),
+      } as Response);
+
+      await expect(channel.send({
+        output: 'Test',
+        metadata: { chatId: 123456789 },
+      })).rejects.toThrow('Telegram API error: Bad Request: chat not found');
+    });
+
+    it('should throw on HTTP error', async () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: false,
+        statusText: 'Unauthorized',
+      } as Response);
+
+      await expect(channel.send({
+        output: 'Test',
+        metadata: { chatId: 123456789 },
+      })).rejects.toThrow('Failed to send Telegram message: Unauthorized');
+    });
+  });
+
+  describe('listen', () => {
+    it('should be callable for polling mode', () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      // Just verify channel is properly configured
+      // Actual polling/webhook startup is tested in integration
+      expect(channel).toBeDefined();
+    });
+
+    it('should be callable for webhook mode', () => {
+      const channel = new TelegramChannel({
+        ...baseConfig,
+        webhookUrl: 'https://example.com/webhook',
+      });
+
+      // Just verify channel is properly configured
+      expect(channel).toBeDefined();
+    });
+  });
+
+  describe('stop', () => {
+    it('should handle stop gracefully', async () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      // Should not throw even if not started
+      await expect(channel.stop()).resolves.not.toThrow();
+    });
+
+    it('should close webhook server if present', async () => {
+      const channel = new TelegramChannel({
+        ...baseConfig,
+        webhookUrl: 'https://example.com/webhook',
+      });
+
+      // Mock server without actually starting it
+      const mockClose = vi.fn((cb) => cb());
+      (channel as unknown as { server: { close: typeof mockClose } }).server = { close: mockClose };
+
+      await channel.stop();
+
+      expect(mockClose).toHaveBeenCalled();
+    });
+
+    it('should close server when configured with webhook', async () => {
+      const channel = new TelegramChannel({
+        ...baseConfig,
+        webhookUrl: 'https://example.com/webhook',
+      });
+
+      // Mock server to avoid errors - set it before calling stop
+      const mockClose = vi.fn((cb) => cb && cb());
+      (channel as unknown as { server: { close: typeof mockClose } }).server = { close: mockClose };
+
+      // Mock fetch for deleteWebhook
+      global.fetch = vi.fn().mockResolvedValue({
+        ok: true,
+        json: async () => ({ ok: true }),
+      } as unknown as Response);
+
+      // Stop should complete without hanging
+      await channel.stop();
+
+      // Verify server was closed
+      expect(mockClose).toHaveBeenCalled();
+    });
+  });
+
+  describe('polling', () => {
+    it('should start polling when listen is called', () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      // Just verify that listen() doesn't throw when starting polling mode
+      expect(() => channel.listen()).not.toThrow();
+
+      // Cleanup
+      channel.stop().catch(() => {}); // Ignore any errors during cleanup
+    });
+
+    it('advances offset correctly — no double-increment that would skip updates', async () => {
+      const channel = new TelegramChannel(baseConfig);
+
+      global.fetch = vi.fn()
+        // First poll: returns update_id 1 and 3
+        .mockResolvedValueOnce({
+          ok: true,
+          json: async () => ({
+            ok: true,
+            result: [
+              { update_id: 1, message: { text: 'a', chat: { id: 100 }, from: { id: 1 }, message_id: 1 } },
+              { update_id: 3, message: { text: 'b', chat: { id: 100 }, from: { id: 1 }, message_id: 2 } },
+            ],
+          }),
+        } as Response)
+        // Second poll — offset must be 4 (last update_id + 1), not 5 (which would skip update_id=4)
+        .mockResolvedValueOnce({
+          ok: true,
+          json: async () => ({ ok: true, result: [] }),
+        } as Response);
+
+      await (channel as any).pollUpdates();
+      await (channel as any).pollUpdates();
+
+      const secondCallUrl = (fetch as ReturnType<typeof vi.fn>).mock.calls[1][0] as string;
+      expect(secondCallUrl).toContain('offset=4');
+    });
+  });
+
+  describe('normalize — channel context', () => {
+    it('sets channelType to "private" for DM chats so defaultGetScope returns dm scope', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'private message',
+          chat: { id: 555, type: 'private' },
+          from: { id: 100 },
+          message_id: 1,
+        },
+      });
+      expect(input.context?.channelType).toBe('private');
+    });
+
+    it('sets channelType to "group" for group chats', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'group message',
+          chat: { id: 777, type: 'group', title: 'Project Kore' },
+          from: { id: 100 },
+          message_id: 2,
+        },
+      });
+      expect(input.context?.channelType).toBe('group');
+    });
+
+    it('sets channelName from chat.title for group chats', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'hi team',
+          chat: { id: 777, type: 'group', title: 'Project Kore' },
+          from: { id: 100 },
+          message_id: 3,
+        },
+      });
+      expect(input.context?.channelName).toBe('Project Kore');
+    });
+
+    it('sets channelName to undefined for private chats (DMs have no title)', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'hey',
+          chat: { id: 555, type: 'private' },
+          from: { id: 100, first_name: 'Alice' },
+          message_id: 4,
+        },
+      });
+      expect(input.context?.channelName).toBeUndefined();
+    });
+
+    it('produces empty string conversationId when chat.id is null', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'msg',
+          chat: { id: null, type: 'group' },
+          from: { id: 100 },
+          message_id: 1,
+        },
+      });
+      expect(input.conversationId).toBe('');
+    });
+
+    it('sets channelId to the stringified chat id', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'msg',
+          chat: { id: 12345, type: 'group' },
+          from: { id: 100 },
+          message_id: 5,
+        },
+      });
+      expect(input.context?.channelId).toBe('12345');
+    });
+  });
+
+  describe('normalize — mentions', () => {
+    it('extracts text_mention entity user ids into context.mentions', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'Hey can you help?',
+          chat: { id: 100 },
+          from: { id: 200 },
+          entities: [
+            { type: 'text_mention', user: { id: 42 } },
+            { type: 'text_mention', user: { id: 99 } },
+          ],
+        },
+      });
+      expect(input.context?.mentions).toEqual(['42', '99']);
+    });
+
+    it('sets context.mentions to undefined when no text_mention entities exist', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'plain message',
+          chat: { id: 100 },
+          from: { id: 200 },
+          entities: [{ type: 'mention', offset: 0, length: 5 }], // @username — no user id
+        },
+      });
+      expect(input.context?.mentions).toBeUndefined();
+    });
+
+    it('sets context.mentions to undefined when entities array is absent', () => {
+      const channel = new TelegramChannel(baseConfig);
+      const input = channel.normalize({
+        message: {
+          text: 'no entities here',
+          chat: { id: 100 },
+          from: { id: 200 },
+        },
+      });
+      expect(input.context?.mentions).toBeUndefined();
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/channels/telegram-channel.ts b/packages/toolpack-agents/src/channels/telegram-channel.ts
new file mode 100644
index 0000000..5d73564
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/telegram-channel.ts
@@ -0,0 +1,384 @@
+import { BaseChannel } from './base-channel.js';
+import { AgentInput, AgentOutput, Participant } from '../agent/types.js';
+
+/**
+ * Configuration options for TelegramChannel.
+ */
+export interface TelegramChannelConfig {
+  /** Optional name for the channel - required for sendTo() routing */
+  name?: string;
+
+  /** Telegram bot token (from @BotFather) */
+  token: string;
+
+  /** Optional webhook URL for receiving updates (if not using polling) */
+  webhookUrl?: string;
+}
+
+/**
+ * Telegram channel for two-way Telegram bot integration.
+ * Receives messages from users and sends replies.
+ */
+export class TelegramChannel extends BaseChannel {
+  readonly isTriggerChannel = false;
+  private config: TelegramChannelConfig;
+  private offset: number = 0;
+  private pollingInterval?: NodeJS.Timeout;
+  private server?: any; // HTTP server for webhook mode
+
+  /**
+   * The bot's Telegram user id (numeric, as a string), populated by the
+   * startup self-check (`getMe`) when `listen()` is called.
+   *
+   * Pass this to `AssemblerOptions.agentAliases` so the assembler's
+   * addressed-only mode can match `text_mention` entities whose user id
+   * equals this value.
+   */
+  botUserId?: string;
+
+  /** The bot's @username (without the @), populated by the `getMe` check. */
+  botUsername?: string;
+
+  constructor(config: TelegramChannelConfig) {
+    super();
+    this.name = config.name;
+    this.config = config;
+  }
+
+  /**
+   * Start listening for Telegram updates.
+   * Uses either webhook or polling mode depending on configuration.
+   */
+  listen(): void {
+    // Run async — failure is logged but does not prevent the channel from listening.
+    this.runStartupCheck().catch(() => {});
+    if (this.config.webhookUrl) {
+      this.startWebhook();
+    } else {
+      this.startPolling();
+    }
+  }
+
+  /**
+   * Calls Telegram's `getMe` API to verify the token and log the bot's
+   * identity. Stores `botUserId` and `botUsername` for use in
+   * `AssemblerOptions.agentAliases`. Non-fatal — a failed check logs a
+   * warning but does not stop the channel.
+   */
+  private async runStartupCheck(): Promise<void> {
+    try {
+      const response = await fetch(
+        `https://api.telegram.org/bot${this.config.token}/getMe`
+      );
+
+      const data = await response.json() as {
+        ok: boolean;
+        result?: {
+          id?: number;
+          username?: string;
+          first_name?: string;
+        };
+        description?: string;
+      };
+
+      if (data.ok && data.result) {
+        const bot = data.result;
+        this.botUserId = bot.id != null ? String(bot.id) : undefined;
+        this.botUsername = bot.username;
+        console.log(
+          `[TelegramChannel] Connected as @${bot.username} (id: ${bot.id}, name: ${bot.first_name})`
+        );
+      } else {
+        console.warn(`[TelegramChannel] getMe failed: ${data.description ?? 'unknown error'}. Check your bot token.`);
+      }
+    } catch (err) {
+      console.warn('[TelegramChannel] Startup self-check failed (network error):', err);
+    }
+  }
+
+  /**
+   * Send a message back to Telegram.
+   * @param output The agent output to send
+   */
+  async send(output: AgentOutput): Promise<void> {
+    // Get chat ID from metadata (set during normalize)
+    const chatId = output.metadata?.chatId as string | number | undefined;
+
+    if (!chatId) {
+      throw new Error('Telegram send requires chatId in metadata');
+    }
+
+    const response = await fetch(`https://api.telegram.org/bot${this.config.token}/sendMessage`, {
+      method: 'POST',
+      headers: {
+        'Content-Type': 'application/json',
+      },
+      body: JSON.stringify({
+        chat_id: chatId,
+        text: output.output,
+        parse_mode: 'Markdown',
+      }),
+    });
+
+    if (!response.ok) {
+      throw new Error(`Failed to send Telegram message: ${response.statusText}`);
+    }
+
+    const data = await response.json() as { ok: boolean; description?: string };
+    if (!data.ok) {
+      throw new Error(`Telegram API error: ${data.description}`);
+    }
+  }
+
+  /**
+   * Normalize a Telegram update into AgentInput.
+   * @param incoming Telegram update object
+   * @returns Normalized AgentInput
+   */
+  normalize(incoming: unknown): AgentInput {
+    const update = incoming as Record<string, unknown>;
+
+    // Get message from update (handles both message and edited_message)
+    const message = (update.message as Record<string, unknown>) ||
+                    (update.edited_message as Record<string, unknown>) ||
+                    {};
+
+    const text = (message.text as string) || '';
+    const chat = (message.chat as Record<string, unknown>) || {};
+    const from = (message.from as Record<string, unknown>) || {};
+
+    // Telegram's user IDs are numbers, convert to string for Participant.id
+    const userId = from.id != null ? String(from.id) : undefined;
+    const displayName =
+      (from.first_name as string | undefined) ||
+      (from.username as string | undefined) ||
+      userId;
+
+    const participant: Participant | undefined = userId
+      ? { kind: 'user', id: userId, displayName: displayName ?? userId }
+      : undefined;
+
+    // Extract @-mentions from Telegram message entities.
+    // `text_mention` entities carry a `user` object with a numeric id — these
+    // are the only mention type where we can resolve the user id without an
+    // additional API call. Regular `mention` entities (by @username) are logged
+    // but not yet resolved to user ids in v1.
+    const entities = (message.entities as Array<Record<string, unknown>> | undefined) ?? [];
+    const mentions: string[] = [];
+    for (const entity of entities) {
+      if (entity.type === 'text_mention' && entity.user) {
+        const mentionUser = entity.user as Record<string, unknown>;
+        if (mentionUser.id != null) {
+          mentions.push(String(mentionUser.id));
+        }
+      }
+    }
+
+    // chat.type: 'private' (DM), 'group', 'supergroup', 'channel'
+    const chatType = chat.type as string | undefined;
+    const chatIdStr = chat.id != null ? String(chat.id) : '';
+
+    return {
+      message: text,
+      conversationId: chatIdStr,
+      data: update,
+      participant,
+      context: {
+        chatId: chat.id,
+        userId: from.id,
+        username: from.username,
+        firstName: from.first_name,
+        lastName: from.last_name,
+        messageId: message.message_id,
+        // 'private' maps to scope: 'dm'; 'group'/'supergroup' map to scope: 'channel'.
+        // Read by defaultGetScope in capture-history.
+        channelType: chatType,
+        // Platform channel id — same as conversationId for Telegram (chat.id).
+        channelId: chatIdStr,
+        // Human-readable group/channel name. Absent for private (DM) chats.
+        channelName: chat.title as string | undefined,
+        // Mention user ids extracted from text_mention entities. Read by the
+        // capture interceptor's default getMentions() and written to
+        // StoredMessage.metadata.mentions for addressed-only mode.
+        mentions: mentions.length > 0 ? mentions : undefined,
+      },
+    };
+  }
+
+  /**
+   * Start polling for updates.
+   */
+  private startPolling(): void {
+    console.log('[TelegramChannel] Starting polling mode');
+
+    // Poll every 5 seconds
+    this.pollingInterval = setInterval(async () => {
+      try {
+        await this.pollUpdates();
+      } catch (error) {
+        console.error('[TelegramChannel] Polling error:', error);
+      }
+    }, 5000);
+  }
+
+  /**
+   * Poll for updates from Telegram.
+   */
+  private async pollUpdates(): Promise<void> {
+    const url = `https://api.telegram.org/bot${this.config.token}/getUpdates?offset=${this.offset}&limit=100`;
+
+    const response = await fetch(url);
+    if (!response.ok) {
+      throw new Error(`Telegram getUpdates failed: ${response.statusText}`);
+    }
+
+    const data = await response.json() as {
+      ok: boolean;
+      result: Array<Record<string, unknown>>;
+    };
+
+    if (!data.ok) {
+      throw new Error('Telegram getUpdates returned not ok');
+    }
+
+    for (const update of data.result) {
+      // Update offset
+      const updateId = update.update_id as number;
+      if (updateId >= this.offset) {
+        this.offset = updateId + 1;
+      }
+
+      // Process the update
+      try {
+        const input = this.normalize(update);
+        await this.handleMessage(input);
+      } catch (error) {
+        console.error('[TelegramChannel] Error processing update:', error);
+      }
+    }
+  }
+
+  /**
+   * Start webhook server for receiving updates.
+   */
+  private startWebhook(): void {
+    if (typeof process === 'undefined') return;
+
+    console.log('[TelegramChannel] Starting webhook mode');
+
+    import('http').then((http) => {
+      this.server = http.createServer((req, res) => {
+        this.handleWebhookRequest(req, res);
+      });
+
+      // Extract port from webhook URL or use default
+      const url = new URL(this.config.webhookUrl || 'http://localhost:3000');
+      const port = parseInt(url.port, 10) || 3000;
+
+      this.server.listen(port, () => {
+        console.log(`[TelegramChannel] Webhook server listening on port ${port}`);
+      });
+
+      // Set webhook with Telegram
+      this.setWebhook();
+    }).catch((err) => {
+      console.error('[TelegramChannel] Failed to start webhook server:', err);
+    });
+  }
+
+  /**
+   * Set webhook URL with Telegram.
+   */
+  private async setWebhook(): Promise<void> {
+    if (!this.config.webhookUrl) return;
+
+    const response = await fetch(
+      `https://api.telegram.org/bot${this.config.token}/setWebhook`,
+      {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify({
+          url: this.config.webhookUrl,
+        }),
+      }
+    );
+
+    if (!response.ok) {
+      console.error('[TelegramChannel] Failed to set webhook');
+      return;
+    }
+
+    const data = await response.json() as { ok: boolean; description?: string };
+    if (data.ok) {
+      console.log('[TelegramChannel] Webhook set successfully');
+    } else {
+      console.error('[TelegramChannel] Failed to set webhook:', data.description);
+    }
+  }
+
+  /**
+   * Handle incoming webhook requests from Telegram.
+   */
+  private handleWebhookRequest(req: any, res: any): void {
+    if (req.method !== 'POST') {
+      res.writeHead(405);
+      res.end('Method not allowed');
+      return;
+    }
+
+    let body = '';
+    req.on('data', (chunk: Buffer) => {
+      body += chunk.toString();
+    });
+
+    req.on('end', () => {
+      try {
+        const update = JSON.parse(body);
+
+        // Process the update asynchronously
+        this.handleMessage(this.normalize(update)).catch((error) => {
+          console.error('[TelegramChannel] Error processing webhook:', error);
+        });
+
+        res.writeHead(200);
+        res.end('OK');
+      } catch (error) {
+        console.error('[TelegramChannel] Error parsing webhook:', error);
+        res.writeHead(400);
+        res.end('Bad request');
+      }
+    });
+  }
+
+  /**
+   * Stop the channel (polling or webhook).
+   */
+  async stop(): Promise<void> {
+    // Stop polling
+    if (this.pollingInterval) {
+      clearInterval(this.pollingInterval);
+      this.pollingInterval = undefined;
+    }
+
+    // Stop webhook server
+    if (this.server) {
+      return new Promise((resolve) => {
+        this.server.close(resolve);
+      });
+    }
+
+    // Delete webhook if set
+    if (this.config.webhookUrl) {
+      try {
+        await fetch(
+          `https://api.telegram.org/bot${this.config.token}/deleteWebhook`,
+          { method: 'POST' }
+        );
+      } catch (error) {
+        console.error('[TelegramChannel] Failed to delete webhook:', error);
+      }
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/channels/webhook-channel.test.ts b/packages/toolpack-agents/src/channels/webhook-channel.test.ts
new file mode 100644
index 0000000..ec9f9f4
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/webhook-channel.test.ts
@@ -0,0 +1,231 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { WebhookChannel, WebhookChannelConfig } from './webhook-channel.js';
+import { AgentInput, AgentOutput } from '../agent/types.js';
+
+describe('WebhookChannel', () => {
+  const baseConfig: WebhookChannelConfig = {
+    path: '/agent/support',
+    port: 3102, // Unique port for Webhook tests
+  };
+
+  describe('constructor', () => {
+    it('should create with required config', () => {
+      const channel = new WebhookChannel({ path: '/webhook' });
+      expect(channel).toBeDefined();
+    });
+
+    it('should set name from config', () => {
+      const channel = new WebhookChannel({ ...baseConfig, name: 'webhook-support' });
+      expect(channel.name).toBe('webhook-support');
+    });
+
+    it('should use default port if not specified', () => {
+      const channel = new WebhookChannel({ path: '/webhook' });
+      expect(channel).toBeDefined();
+    });
+
+    it('should have isTriggerChannel set to false', () => {
+      const channel = new WebhookChannel(baseConfig);
+      expect(channel.isTriggerChannel).toBe(false);
+    });
+  });
+
+  describe('normalize', () => {
+    it('should map HTTP body to AgentInput', () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      const body = {
+        message: 'Help needed',
+        intent: 'support',
+        userId: 'user-123',
+      };
+
+      const input = channel.normalize(body);
+
+      expect(input.message).toBe('Help needed');
+      expect(input.intent).toBe('support');
+      expect(input.data).toEqual(body);
+    });
+
+    it('should use text field as fallback for message', () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      const body = {
+        text: 'Text message',
+      };
+
+      const input = channel.normalize(body);
+
+      expect(input.message).toBe('Text message');
+    });
+
+    it('should extract sessionId from x-session-id header', () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      const body = {
+        message: 'Test',
+        headers: {
+          'x-session-id': 'session-123',
+        },
+      };
+
+      const input = channel.normalize(body);
+
+      expect(input.conversationId).toBe('session-123');
+      expect(input.context?.sessionId).toBe('session-123');
+    });
+
+    it('should extract sessionId from X-Session-Id header (case insensitive)', () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      const body = {
+        message: 'Test',
+        headers: {
+          'X-Session-Id': 'session-456',
+        },
+      };
+
+      const input = channel.normalize(body);
+
+      expect(input.conversationId).toBe('session-456');
+    });
+
+    it('should fall back to body sessionId if no header', () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      const body = {
+        message: 'Test',
+        sessionId: 'session-789',
+      };
+
+      const input = channel.normalize(body);
+
+      expect(input.conversationId).toBe('session-789');
+    });
+
+    it('should fall back to body conversationId if no sessionId', () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      const body = {
+        message: 'Test',
+        conversationId: 'conv-abc',
+      };
+
+      const input = channel.normalize(body);
+
+      expect(input.conversationId).toBe('conv-abc');
+    });
+
+    it('should auto-generate sessionId if not provided', () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      const body = {
+        message: 'Test',
+      };
+
+      const input = channel.normalize(body);
+
+      expect(input.conversationId).toMatch(/^webhook-/);
+    });
+  });
+
+  describe('send', () => {
+    it('should resolve pending response by conversationId', async () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      // Simulate a pending response
+      const mockResolve = vi.fn();
+      const mockReject = vi.fn();
+      (channel as unknown as { pendingResponses: Map<string, { resolve: typeof mockResolve; reject: typeof mockReject }> }).pendingResponses.set('session-123', {
+        resolve: mockResolve,
+        reject: mockReject,
+      });
+
+      await channel.send({
+        output: 'Response to user',
+        metadata: {
+          conversationId: 'session-123',
+        },
+      });
+
+      expect(mockResolve).toHaveBeenCalledWith({
+        output: 'Response to user',
+        metadata: {
+          conversationId: 'session-123',
+        },
+      });
+    });
+
+    it('should not throw if no pending response found', async () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      // Should not throw
+      await expect(channel.send({
+        output: 'Orphaned response',
+        metadata: {
+          conversationId: 'unknown-session',
+        },
+      })).resolves.not.toThrow();
+    });
+
+    it('should handle missing metadata', async () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      await expect(channel.send({
+        output: 'No metadata',
+      })).resolves.not.toThrow();
+    });
+  });
+
+  describe('request handling flow', () => {
+    it('should store sessionId in pending responses during handleRequest', () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      // Verify the pendingResponses map exists and works
+      const testInput: AgentInput = {
+        message: 'Test',
+        conversationId: 'test-session',
+      };
+
+      // Set up handler
+      const handler = vi.fn().mockResolvedValue(undefined);
+      channel.onMessage(handler);
+
+      // The actual request flow is tested in integration
+      // This verifies the channel structure supports the flow
+      expect(channel).toBeDefined();
+    });
+  });
+
+  describe('listen', () => {
+    it('should create HTTP server', () => {
+      const channel = new WebhookChannel({ ...baseConfig, name: 'webhook-support' });
+
+      // Just verify the channel was created successfully
+      // Actual server startup is tested in integration tests
+      expect(channel).toBeDefined();
+      expect(channel.name).toBe('webhook-support');
+    });
+  });
+
+  describe('stop', () => {
+    it('should close server if running', async () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      // Mock server
+      const mockClose = vi.fn((cb) => cb());
+      (channel as unknown as { server: { close: typeof mockClose } }).server = { close: mockClose };
+
+      await channel.stop();
+
+      expect(mockClose).toHaveBeenCalled();
+    });
+
+    it('should handle missing server gracefully', async () => {
+      const channel = new WebhookChannel(baseConfig);
+
+      // Should not throw when server is undefined
+      await expect(channel.stop()).resolves.not.toThrow();
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/channels/webhook-channel.ts b/packages/toolpack-agents/src/channels/webhook-channel.ts
new file mode 100644
index 0000000..78318b0
--- /dev/null
+++ b/packages/toolpack-agents/src/channels/webhook-channel.ts
@@ -0,0 +1,200 @@
+import { BaseChannel } from './base-channel.js';
+import { AgentInput, AgentOutput } from '../agent/types.js';
+
+/**
+ * Configuration options for WebhookChannel.
+ */
+export interface WebhookChannelConfig {
+  /** Optional name for the channel - required for sendTo() routing */
+  name?: string;
+
+  /** HTTP path to listen on (e.g., '/agent/support') */
+  path: string;
+
+  /** Optional port for the HTTP server (default: 3000) */
+  port?: number;
+}
+
+/**
+ * Pending response for webhook requests.
+ */
+interface PendingResponse {
+  resolve: (value: unknown) => void;
+  reject: (reason: Error) => void;
+}
+
+/**
+ * Webhook channel that exposes an HTTP endpoint.
+ * Receives HTTP requests and responds with agent output.
+ */
+export class WebhookChannel extends BaseChannel {
+  readonly isTriggerChannel = false;
+  private config: WebhookChannelConfig;
+  private server?: any; // HTTP server instance
+  private pendingResponses: Map<string, PendingResponse> = new Map();
+
+  constructor(config: WebhookChannelConfig) {
+    super();
+    this.name = config.name;
+    this.config = {
+      port: config.port ?? 3000,
+      path: config.path ?? '/webhook',
+    };
+  }
+
+  /**
+   * Start listening for HTTP requests.
+   */
+  listen(): void {
+    if (typeof process !== 'undefined') {
+      import('http').then((http) => {
+        this.server = http.createServer((req, res) => {
+          this.handleRequest(req, res);
+        });
+
+        this.server.listen(this.config.port, () => {
+          console.log(`[WebhookChannel] Listening on port ${this.config.port}${this.config.path}`);
+        });
+      }).catch((err) => {
+        console.error('[WebhookChannel] Failed to start HTTP server:', err);
+      });
+    }
+  }
+
+  /**
+   * Send the agent output as an HTTP response.
+   * @param output The agent output to send
+   */
+  async send(output: AgentOutput): Promise<void> {
+    // In webhook mode, we need to find the pending response for this request
+    // The conversationId from the input is used as the lookup key
+    const conversationId = output.metadata?.conversationId as string | undefined;
+
+    if (conversationId && this.pendingResponses.has(conversationId)) {
+      const pending = this.pendingResponses.get(conversationId)!;
+      this.pendingResponses.delete(conversationId);
+
+      pending.resolve({
+        output: output.output,
+        metadata: output.metadata,
+      });
+    }
+  }
+
+  /**
+   * Normalize an HTTP request into AgentInput.
+   * @param incoming HTTP request body with headers
+   * @returns Normalized AgentInput
+   */
+  normalize(incoming: unknown): AgentInput {
+    const body = incoming as Record<string, unknown>;
+
+    // Extract session ID from x-session-id header, body, or auto-generate
+    const headers = (body.headers as Record<string, string>) || {};
+    const sessionId = headers['x-session-id'] ||
+                      headers['X-Session-Id'] ||
+                      (body.sessionId as string) ||
+                      (body.conversationId as string) ||
+                      this.generateSessionId();
+
+    return {
+      message: (body.message as string) || (body.text as string) || '',
+      intent: body.intent as string | undefined,
+      conversationId: sessionId,
+      data: body,
+      context: {
+        headers: body.headers,
+        method: body.method,
+        sessionId, // Store for reference
+      },
+    };
+  }
+
+  /**
+   * Handle incoming HTTP requests.
+   */
+  private handleRequest(req: any, res: any): void {
+    // Check path match
+    if (req.url !== this.config.path) {
+      res.writeHead(404);
+      res.end('Not found');
+      return;
+    }
+
+    if (req.method !== 'POST') {
+      res.writeHead(405);
+      res.end('Method not allowed');
+      return;
+    }
+
+    let body = '';
+    req.on('data', (chunk: Buffer) => {
+      body += chunk.toString();
+    });
+
+    req.on('end', () => {
+      try {
+        const payload = JSON.parse(body);
+        const input = this.normalize(payload);
+
+        // Store the response resolver for later
+        const sessionId = input.conversationId || this.generateSessionId();
+
+        const responsePromise = new Promise((resolve, reject) => {
+          this.pendingResponses.set(sessionId, { resolve, reject });
+
+          // Set a timeout to reject if no response comes
+          setTimeout(() => {
+            if (this.pendingResponses.has(sessionId)) {
+              this.pendingResponses.delete(sessionId);
+              reject(new Error('Agent response timeout'));
+            }
+          }, 30000); // 30 second timeout
+        });
+
+        // Ensure conversationId is in metadata for send() to find the response
+        this.handleMessage({
+          ...input,
+          conversationId: sessionId,
+          context: {
+            ...input.context,
+            sessionId,
+          },
+        });
+
+        // Wait for the agent response
+        responsePromise
+          .then((result) => {
+            res.writeHead(200, { 'Content-Type': 'application/json' });
+            res.end(JSON.stringify(result));
+          })
+          .catch((error) => {
+            res.writeHead(500, { 'Content-Type': 'application/json' });
+            res.end(JSON.stringify({ error: error.message }));
+          });
+      } catch (error) {
+        console.error('[WebhookChannel] Error handling request:', error);
+        res.writeHead(400, { 'Content-Type': 'application/json' });
+        res.end(JSON.stringify({ error: 'Bad request' }));
+      }
+    });
+  }
+
+  /**
+   * Generate a unique session ID.
+   */
+  private generateSessionId(): string {
+    return `webhook-${Date.now()}-${Math.random().toString(36).substring(2, 9)}`;
+  }
+
+  /**
+   * Stop the HTTP server.
+   */
+  async stop(): Promise<void> {
+    if (this.server) {
+      return new Promise((resolve) => {
+        this.server.close(resolve);
+      });
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/history/assembler.ts b/packages/toolpack-agents/src/history/assembler.ts
new file mode 100644
index 0000000..6f3e381
--- /dev/null
+++ b/packages/toolpack-agents/src/history/assembler.ts
@@ -0,0 +1,302 @@
+import { randomUUID } from 'crypto';
+import type { ConversationStore, StoredMessage, AssemblerOptions, AssembledPrompt, PromptMessage } from 'toolpack-sdk';
+import type { SummarizerAgent, SummarizerOutput, HistoryTurn } from '../capabilities/summarizer-agent.js';
+
+/**
+ * Estimate the token count of a string (characters / 4).
+ * Fast and good enough for budget enforcement; not exact.
+ */
+function estimateTokens(text: string): number {
+  return Math.ceil(text.length / 4);
+}
+
+/**
+ * Convert a `StoredMessage` to the summarizer's `HistoryTurn` format.
+ * The assembler calls this before passing history to `SummarizerAgent`.
+ */
+function toHistoryTurn(message: StoredMessage): HistoryTurn {
+  return {
+    id: message.id,
+    participant: message.participant,
+    content: message.content,
+    timestamp: message.timestamp,
+  };
+}
+
+/**
+ * Project a `StoredMessage` into a `PromptMessage` from the perspective of a
+ * specific agent (identified by `agentId`).
+ *
+ * Projection table (per plan doc):
+ * | Stored participant                       | role      | content                          |
+ * |------------------------------------------|-----------|----------------------------------|
+ * | kind: 'system'                           | system    | as-is                            |
+ * | kind: 'user'                             | user      | "{displayName}: {content}"       |
+ * | kind: 'agent', id === agentId            | assistant | as-is                            |
+ * | kind: 'agent', id !== agentId            | user      | "{name} (agent): {content}"      |
+ */
+function project(message: StoredMessage, agentId: string): PromptMessage {
+  const { participant, content } = message;
+
+  if (participant.kind === 'system') {
+    return { role: 'system', content };
+  }
+
+  if (participant.kind === 'agent') {
+    if (participant.id === agentId) {
+      // Current agent's own turn → assistant.
+      return { role: 'assistant', content };
+    }
+    // Peer agent → user with label.
+    const name = participant.displayName ?? participant.id;
+    return { role: 'user', content: `${name} (agent): ${content}` };
+  }
+
+  // kind === 'user'
+  const displayName = participant.displayName ?? participant.id;
+  return { role: 'user', content: `${displayName}: ${content}` };
+}
+
+/**
+ * Check whether an agent was "involved" in a message.
+ * Used for addressed-only mode filtering.
+ *
+ * An agent is considered involved if:
+ * - The message was sent by the agent itself (authorship matches `agentId`), OR
+ * - Any id in `agentAllIds` appears in the message's `metadata.mentions` list.
+ *
+ * Two distinct id sets are used because:
+ * - **Authorship** — the capture interceptor always writes the stable agent name
+ *   (`agentId`) as `participant.id`, regardless of platform.
+ * - **Mentions** — platforms store mentions as their own user ids (e.g. Slack's
+ *   `'U_BOT123'`), which may differ from the stable agent name. `agentAllIds`
+ *   covers both the stable name and any platform aliases.
+ *
+ * @param message     The stored message to test.
+ * @param agentId     The agent's stable internal id (its registered name).
+ * @param agentAllIds Set of all ids considered "this agent" for mention matching
+ *                    (includes agentId itself plus any platform aliases).
+ */
+function agentIsInvolved(
+  message: StoredMessage,
+  agentId: string,
+  agentAllIds: ReadonlySet<string>
+): boolean {
+  // Authorship: the capture interceptor writes the stable agent name.
+  if (message.participant.id === agentId) return true;
+  // @-mention: check against the full alias set (name + platform ids).
+  if (message.metadata?.mentions?.some(m => agentAllIds.has(m))) return true;
+  return false;
+}
+
+/**
+ * Assemble a prompt slice from conversation history for a specific agent.
+ *
+ * This is the function that actually controls token cost. It:
+ * 1. Loads a scoped, time-windowed slice of history from the store.
+ * 2. Optionally filters to turns where the agent was involved (addressed-only mode).
+ * 3. Triggers rolling summarisation via `SummarizerAgent` when the turn count
+ *    exceeds `options.rollingSummaryThreshold`.
+ * 4. Projects each `StoredMessage` into the LLM's role-based format from the
+ *    current agent's point of view.
+ * 5. Enforces a hard token budget, filling priority slots top-down.
+ *
+ * @param store           The conversation store to read from.
+ * @param conversationId  The conversation to load.
+ * @param agentId         The current agent's stable id (its registered name).
+ * @param agentName       The current agent's display name.
+ * @param options         Tuning knobs — scope, budget, addressed-only mode, etc.
+ * @param summarizer      Optional `SummarizerAgent` instance for rolling summaries.
+ *                        When omitted, old turns are simply dropped when the
+ *                        threshold is exceeded.
+ *
+ * @example
+ * ```ts
+ * const prompt = await assemblePrompt(store, conversationId, agent.name, agent.name, {
+ *   scope: 'channel',
+ *   tokenBudget: 3000,
+ *   addressedOnlyMode: true,
+ *   rollingSummaryThreshold: 40,
+ * }, summarizerAgent);
+ *
+ * const response = await llm.chat([
+ *   { role: 'system', content: agent.systemPrompt },
+ *   ...prompt.messages,
+ *   { role: 'user', content: triggeringMessage },
+ * ]);
+ * ```
+ */
+export async function assemblePrompt(
+  store: ConversationStore,
+  conversationId: string,
+  agentId: string,
+  agentName: string,
+  options: AssemblerOptions = {},
+  summarizer?: SummarizerAgent
+): Promise<AssembledPrompt> {
+  const {
+    scope,
+    addressedOnlyMode = true,
+    tokenBudget = 3000,
+    rollingSummaryThreshold = 40,
+    timeWindowMinutes,
+    maxTurnsToLoad = 100,
+    agentAliases,
+  } = options;
+
+  // Unified set of ids that mean "this agent" for involvement checking.
+  // Always includes the stable agentId; callers add platform-specific ids
+  // (e.g. Slack bot user id 'U_BOT123') via agentAliases so that @-mentions
+  // stored as platform ids still trigger the addressed-only filter correctly.
+  const agentAllIds: ReadonlySet<string> = new Set([agentId, ...(agentAliases ?? [])]);
+
+  // --- 1. Load a scoped, time-windowed slice from the store ---
+
+  const sinceTimestamp = timeWindowMinutes !== undefined
+    ? new Date(Date.now() - timeWindowMinutes * 60 * 1000).toISOString()
+    : undefined;
+
+  let messages = await store.get(conversationId, {
+    scope,
+    sinceTimestamp,
+    limit: maxTurnsToLoad,
+  });
+
+  const turnsLoaded = messages.length;
+
+  // --- 2. Addressed-only mode: keep agent-involved turns + direct messages ---
+
+  if (addressedOnlyMode) {
+    // Build a set of involved message ids covering three criteria:
+    //   a) The agent authored the message.
+    //   b) The agent's id appears in the message's @-mention list.
+    //   c) "Replied next" — the message immediately after this one is an
+    //      agent-authored turn (i.e., this message was what the agent replied to).
+    const involvedIds = new Set<string>();
+
+    for (let i = 0; i < messages.length; i++) {
+      const m = messages[i];
+
+      if (agentIsInvolved(m, agentId, agentAllIds)) {
+        involvedIds.add(m.id);
+      }
+
+      // Criterion (c): if the very next turn was authored by this agent,
+      // include the current turn as the message that triggered the reply.
+      // Authorship uses agentId (the stable name) — aliases are not needed here
+      // because the capture interceptor always writes the stable name.
+      if (i < messages.length - 1) {
+        const next = messages[i + 1];
+        if (next.participant.kind === 'agent' && next.participant.id === agentId) {
+          involvedIds.add(m.id);
+        }
+      }
+    }
+
+    // Always include the most recent message — it's the triggering message and
+    // must always be in context regardless of whether the agent was addressed.
+    const mostRecent = messages[messages.length - 1];
+    if (mostRecent) {
+      involvedIds.add(mostRecent.id);
+    }
+
+    messages = messages.filter(m => involvedIds.has(m.id));
+  }
+
+  // --- 3. Rolling summary: compress oldest turns when over threshold ---
+
+  let hasSummary = false;
+
+  if (messages.length > rollingSummaryThreshold && summarizer) {
+    // Split: summarise the oldest portion, keep the recent tail verbatim.
+    const splitPoint = Math.floor(messages.length / 2);
+    const toSummarise = messages.slice(0, splitPoint);
+    const recent = messages.slice(splitPoint);
+
+    // Gap #8: exclude existing summary turns from the summariser input —
+    // they are already compressed and feeding them back would double-summarise.
+    // The summariser receives only the raw turns; the summary text itself is
+    // preserved in the store as part of the new summary's content.
+    const rawTurnsToSummarise = toSummarise.filter(m => !m.metadata?.isSummary);
+
+    try {
+      const summarizerResult = await summarizer.invokeAgent({
+        message: 'summarize',
+        data: {
+          turns: rawTurnsToSummarise.map(toHistoryTurn),
+          agentName,
+          agentId,
+          maxTokens: Math.floor(tokenBudget * 0.25), // summary gets ≤25% of budget
+          extractDecisions: true,
+        },
+      });
+
+      const parsed = JSON.parse(summarizerResult.output) as SummarizerOutput;
+
+      const summaryMessage: StoredMessage = {
+        id: `summary-${randomUUID()}`,
+        conversationId,
+        participant: { kind: 'system', id: 'summarizer' },
+        content: `[Summary of ${parsed.turnsSummarized} earlier turns]: ${parsed.summary}`,
+        timestamp: toSummarise[0].timestamp,
+        scope: scope ?? 'channel',
+        metadata: { isSummary: true },
+      };
+
+      messages = [summaryMessage, ...recent];
+      hasSummary = true;
+
+      // Gap #2: persist the summary to the store and delete the turns it covers.
+      // This prevents the same turns from being re-summarised on subsequent calls,
+      // eliminating redundant LLM cost and making the isSummary flag meaningful.
+      // Errors here must not crash the pipeline — the in-memory result is still valid.
+      try {
+        await store.append(summaryMessage);
+        await store.deleteMessages(conversationId, toSummarise.map(m => m.id));
+      } catch {
+        // Persistence failure is non-fatal: the in-memory assembled prompt is
+        // still correct for this call; the turns will simply be re-summarised
+        // on the next invocation.
+      }
+    } catch {
+      // Summarisation failure must not crash the pipeline.
+      // Fall through with the full (unsummarised) recent slice.
+      messages = messages.slice(-rollingSummaryThreshold);
+    }
+  } else if (messages.length > rollingSummaryThreshold) {
+    // No summariser available — just keep the most recent turns.
+    messages = messages.slice(-rollingSummaryThreshold);
+  }
+
+  // --- 4. Project each message into the LLM's role-based format ---
+
+  const projected = messages.map(m => project(m, agentId));
+
+  // --- 5. Enforce token budget (fill top-down, drop oldest when over) ---
+
+  if (projected.length === 0) {
+    return { messages: [], estimatedTokens: 0, turnsLoaded, hasSummary };
+  }
+
+  // The most recent message is the triggering message — always include it
+  // regardless of budget so the agent is never completely blind.
+  const lastMsg = projected[projected.length - 1];
+  const budgetedMessages: PromptMessage[] = [lastMsg];
+  let tokenCount = estimateTokens(lastMsg.content);
+
+  // Walk older turns newest-first and fill whatever budget remains.
+  for (let i = projected.length - 2; i >= 0; i--) {
+    const msg = projected[i];
+    const tokens = estimateTokens(msg.content);
+    if (tokenCount + tokens > tokenBudget) break;
+    budgetedMessages.unshift(msg);
+    tokenCount += tokens;
+  }
+
+  return {
+    messages: budgetedMessages,
+    estimatedTokens: tokenCount,
+    turnsLoaded,
+    hasSummary,
+  };
+}
diff --git a/packages/toolpack-agents/src/history/history.test.ts b/packages/toolpack-agents/src/history/history.test.ts
new file mode 100644
index 0000000..390b6a1
--- /dev/null
+++ b/packages/toolpack-agents/src/history/history.test.ts
@@ -0,0 +1,743 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { InMemoryConversationStore } from './store.js';
+import { assemblePrompt } from './assembler.js';
+import { createConversationSearchTool } from './search-tool.js';
+import type { StoredMessage } from 'toolpack-sdk';
+
+// ---------------------------------------------------------------------------
+// Helpers
+// ---------------------------------------------------------------------------
+
+function makeMessage(overrides: Partial<StoredMessage> & { id: string }): StoredMessage {
+  return {
+    conversationId: 'conv-1',
+    participant: { kind: 'user', id: 'u1', displayName: 'Alice' },
+    content: 'hello',
+    timestamp: new Date().toISOString(),
+    scope: 'channel',
+    ...overrides,
+  };
+}
+
+// ---------------------------------------------------------------------------
+// InMemoryConversationStore
+// ---------------------------------------------------------------------------
+
+describe('InMemoryConversationStore', () => {
+  describe('append / get', () => {
+    it('stores and retrieves a message', async () => {
+      const store = new InMemoryConversationStore();
+      const msg = makeMessage({ id: 'm1' });
+
+      await store.append(msg);
+      const result = await store.get('conv-1');
+
+      expect(result).toHaveLength(1);
+      expect(result[0].id).toBe('m1');
+    });
+
+    it('is idempotent — duplicate id is silently ignored', async () => {
+      const store = new InMemoryConversationStore();
+      const msg = makeMessage({ id: 'm1' });
+
+      await store.append(msg);
+      await store.append(msg);
+
+      const result = await store.get('conv-1');
+      expect(result).toHaveLength(1);
+    });
+
+    it('returns messages in ascending timestamp order', async () => {
+      const store = new InMemoryConversationStore();
+
+      await store.append(makeMessage({ id: 'm3', timestamp: '2024-01-01T00:00:03Z' }));
+      await store.append(makeMessage({ id: 'm1', timestamp: '2024-01-01T00:00:01Z' }));
+      await store.append(makeMessage({ id: 'm2', timestamp: '2024-01-01T00:00:02Z' }));
+
+      const result = await store.get('conv-1');
+      expect(result.map(m => m.id)).toEqual(['m1', 'm2', 'm3']);
+    });
+
+    it('returns empty array for unknown conversationId', async () => {
+      const store = new InMemoryConversationStore();
+      const result = await store.get('no-such-conversation');
+      expect(result).toEqual([]);
+    });
+
+    it('isolates messages by conversationId', async () => {
+      const store = new InMemoryConversationStore();
+
+      await store.append(makeMessage({ id: 'm1', conversationId: 'conv-1' }));
+      await store.append(makeMessage({ id: 'm2', conversationId: 'conv-2' }));
+
+      expect(await store.get('conv-1')).toHaveLength(1);
+      expect(await store.get('conv-2')).toHaveLength(1);
+    });
+  });
+
+  describe('get — filtering', () => {
+    it('filters by scope', async () => {
+      const store = new InMemoryConversationStore();
+
+      await store.append(makeMessage({ id: 'm1', scope: 'channel' }));
+      await store.append(makeMessage({ id: 'm2', scope: 'thread' }));
+      await store.append(makeMessage({ id: 'm3', scope: 'dm' }));
+
+      const result = await store.get('conv-1', { scope: 'channel' });
+      expect(result.map(m => m.id)).toEqual(['m1']);
+    });
+
+    it('filters by sinceTimestamp', async () => {
+      const store = new InMemoryConversationStore();
+
+      await store.append(makeMessage({ id: 'm1', timestamp: '2024-01-01T00:00:01Z' }));
+      await store.append(makeMessage({ id: 'm2', timestamp: '2024-01-01T00:00:03Z' }));
+      await store.append(makeMessage({ id: 'm3', timestamp: '2024-01-01T00:00:05Z' }));
+
+      const result = await store.get('conv-1', { sinceTimestamp: '2024-01-01T00:00:03Z' });
+      expect(result.map(m => m.id)).toEqual(['m2', 'm3']);
+    });
+
+    it('filters by participantIds', async () => {
+      const store = new InMemoryConversationStore();
+
+      await store.append(makeMessage({ id: 'm1', participant: { kind: 'user', id: 'u1' } }));
+      await store.append(makeMessage({ id: 'm2', participant: { kind: 'user', id: 'u2' } }));
+      await store.append(makeMessage({ id: 'm3', participant: { kind: 'agent', id: 'kael' } }));
+
+      const result = await store.get('conv-1', { participantIds: ['u1', 'kael'] });
+      expect(result.map(m => m.id)).toEqual(['m1', 'm3']);
+    });
+
+    it('respects limit (most recent N)', async () => {
+      const store = new InMemoryConversationStore();
+
+      for (let i = 1; i <= 5; i++) {
+        await store.append(makeMessage({
+          id: `m${i}`,
+          timestamp: `2024-01-01T00:00:0${i}Z`,
+        }));
+      }
+
+      const result = await store.get('conv-1', { limit: 3 });
+      expect(result.map(m => m.id)).toEqual(['m3', 'm4', 'm5']);
+    });
+  });
+
+  describe('search', () => {
+    it('finds messages containing the query (case-insensitive)', async () => {
+      const store = new InMemoryConversationStore();
+
+      await store.append(makeMessage({ id: 'm1', content: 'Hello world' }));
+      await store.append(makeMessage({ id: 'm2', content: 'Deploy to production' }));
+      await store.append(makeMessage({ id: 'm3', content: 'Say hello again' }));
+
+      const result = await store.search('conv-1', 'hello');
+      const ids = result.map(m => m.id);
+      expect(ids).toContain('m1');
+      expect(ids).toContain('m3');
+      expect(ids).not.toContain('m2');
+    });
+
+    it('returns empty array when no messages match', async () => {
+      const store = new InMemoryConversationStore();
+      await store.append(makeMessage({ id: 'm1', content: 'Hello world' }));
+
+      const result = await store.search('conv-1', 'zxqwerty');
+      expect(result).toHaveLength(0);
+    });
+
+    it('respects the limit option', async () => {
+      const store = new InMemoryConversationStore();
+
+      for (let i = 1; i <= 5; i++) {
+        await store.append(makeMessage({ id: `m${i}`, content: `match ${i}` }));
+      }
+
+      const result = await store.search('conv-1', 'match', { limit: 3 });
+      expect(result).toHaveLength(3);
+    });
+
+    it('never crosses conversationId boundaries', async () => {
+      const store = new InMemoryConversationStore();
+
+      await store.append(makeMessage({ id: 'm1', conversationId: 'conv-1', content: 'hello' }));
+      await store.append(makeMessage({ id: 'm2', conversationId: 'conv-2', content: 'hello' }));
+
+      const result = await store.search('conv-1', 'hello');
+      expect(result.every(m => m.conversationId === 'conv-1')).toBe(true);
+    });
+  });
+
+  describe('memory bounds', () => {
+    it('evicts oldest conversation when maxConversations is exceeded', async () => {
+      const store = new InMemoryConversationStore({ maxConversations: 2 });
+
+      await store.append(makeMessage({ id: 'm1', conversationId: 'conv-1' }));
+      await store.append(makeMessage({ id: 'm2', conversationId: 'conv-2' }));
+      // conv-1 is now LRU
+      await store.append(makeMessage({ id: 'm3', conversationId: 'conv-3' }));
+
+      // conv-1 should have been evicted
+      expect(store.conversationCount).toBe(2);
+      const conv1 = await store.get('conv-1');
+      expect(conv1).toHaveLength(0);
+    });
+
+    it('drops oldest messages when maxMessagesPerConversation is exceeded', async () => {
+      const store = new InMemoryConversationStore({ maxMessagesPerConversation: 3 });
+
+      for (let i = 1; i <= 5; i++) {
+        await store.append(makeMessage({
+          id: `m${i}`,
+          timestamp: `2024-01-01T00:00:0${i}Z`,
+        }));
+      }
+
+      const result = await store.get('conv-1');
+      // Only the 3 most recent should remain
+      expect(result).toHaveLength(3);
+      expect(result.map(m => m.id)).toEqual(['m3', 'm4', 'm5']);
+    });
+  });
+
+  describe('clearConversation', () => {
+    it('removes all messages for a conversation', async () => {
+      const store = new InMemoryConversationStore();
+
+      await store.append(makeMessage({ id: 'm1' }));
+      store.clearConversation('conv-1');
+
+      const result = await store.get('conv-1');
+      expect(result).toHaveLength(0);
+    });
+  });
+
+  describe('deleteMessages', () => {
+    it('removes messages by id, leaving others intact', async () => {
+      const store = new InMemoryConversationStore();
+      await store.append(makeMessage({ id: 'm1' }));
+      await store.append(makeMessage({ id: 'm2' }));
+      await store.append(makeMessage({ id: 'm3' }));
+
+      await store.deleteMessages('conv-1', ['m1', 'm3']);
+
+      const result = await store.get('conv-1');
+      expect(result.map(m => m.id)).toEqual(['m2']);
+    });
+
+    it('is a no-op for ids that do not exist', async () => {
+      const store = new InMemoryConversationStore();
+      await store.append(makeMessage({ id: 'm1' }));
+
+      await store.deleteMessages('conv-1', ['no-such-id']);
+
+      const result = await store.get('conv-1');
+      expect(result).toHaveLength(1);
+    });
+
+    it('is a no-op for an unknown conversationId', async () => {
+      const store = new InMemoryConversationStore();
+      // Should not throw
+      await expect(store.deleteMessages('no-such-conv', ['m1'])).resolves.toBeUndefined();
+    });
+  });
+});
+
+// ---------------------------------------------------------------------------
+// assemblePrompt
+// ---------------------------------------------------------------------------
+
+describe('assemblePrompt', () => {
+  let store: InMemoryConversationStore;
+
+  beforeEach(() => {
+    store = new InMemoryConversationStore();
+  });
+
+  it('returns empty messages when the store is empty', async () => {
+    const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael');
+    expect(result.messages).toHaveLength(0);
+    expect(result.turnsLoaded).toBe(0);
+    expect(result.hasSummary).toBe(false);
+  });
+
+  describe('per-agent projection', () => {
+    it('renders system participant as system role', async () => {
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'system', id: 'system' },
+        content: 'Channel topic: support',
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', { addressedOnlyMode: false });
+      expect(result.messages[0]).toEqual({ role: 'system', content: 'Channel topic: support' });
+    });
+
+    it('renders user participant as user role with displayName prefix', async () => {
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'user', id: 'u1', displayName: 'Alice' },
+        content: 'Hey kael',
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', { addressedOnlyMode: false });
+      expect(result.messages[0]).toEqual({ role: 'user', content: 'Alice: Hey kael' });
+    });
+
+    it('falls back to participant.id when displayName is absent', async () => {
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'user', id: 'u1' },
+        content: 'Hello',
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', { addressedOnlyMode: false });
+      expect(result.messages[0].content).toBe('u1: Hello');
+    });
+
+    it('renders current agent turns as assistant role', async () => {
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'agent', id: 'kael', displayName: 'Kael' },
+        content: 'Sure, I can help with that.',
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', { addressedOnlyMode: false });
+      expect(result.messages[0]).toEqual({ role: 'assistant', content: 'Sure, I can help with that.' });
+    });
+
+    it('renders peer agent turns as user role with "(agent)" label', async () => {
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'agent', id: 'nova', displayName: 'Nova' },
+        content: 'I handled the first part.',
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', { addressedOnlyMode: false });
+      expect(result.messages[0]).toEqual({ role: 'user', content: 'Nova (agent): I handled the first part.' });
+    });
+  });
+
+  describe('addressed-only mode', () => {
+    it('includes messages sent by the agent', async () => {
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'agent', id: 'kael' },
+        content: 'I replied earlier.',
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', { addressedOnlyMode: true });
+      expect(result.messages).toHaveLength(1);
+    });
+
+    it('includes messages that @-mention the agent by stable name', async () => {
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'user', id: 'u1' },
+        content: 'hey kael can you help?',
+        metadata: { mentions: ['kael'] },
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', { addressedOnlyMode: true });
+      expect(result.messages).toHaveLength(1);
+    });
+
+    it('includes messages that @-mention the agent by platform id (agentAliases)', async () => {
+      // Slack stores mentions as platform user ids like 'U_BOT123', not the
+      // stable agent name 'kael'. Without agentAliases this message would be
+      // excluded from the addressed-only filter even though it is directed at
+      // the bot.
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'user', id: 'u1' },
+        content: 'hey <@U_BOT123> can you deploy?',
+        metadata: { mentions: ['U_BOT123'] },
+      }));
+
+      // Without the alias → message is not included (demonstrates the bug).
+      const withoutAlias = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', {
+        addressedOnlyMode: true,
+        maxTurnsToLoad: 100,
+      });
+      // m1 is the most-recent (triggering) message so it's always included even
+      // without the alias; add a second unrelated message first to show the difference.
+      //
+      // Rebuild with a proper setup:
+
+      const store2 = new InMemoryConversationStore();
+      // Side conversation (no mention of bot)
+      await store2.append(makeMessage({ id: 'side', conversationId: 'c2', participant: { kind: 'user', id: 'u2' }, content: 'lunch?' }));
+      // Bot mention by platform id
+      await store2.append(makeMessage({ id: 'bot-msg', conversationId: 'c2', participant: { kind: 'user', id: 'u1' }, content: 'hey can you deploy?', metadata: { mentions: ['U_BOT123'] } }));
+      // More recent unrelated message so bot-msg is NOT the triggering message
+      await store2.append(makeMessage({ id: 'after', conversationId: 'c2', participant: { kind: 'user', id: 'u2' }, content: 'never mind' }));
+
+      // Without alias: bot-msg is excluded (only 'after' is the triggering message)
+      const noAlias = await assemblePrompt(store2, 'c2', 'kael', 'Kael', { addressedOnlyMode: true });
+      expect(noAlias.messages.some(m => m.content.includes('deploy'))).toBe(false);
+
+      // With alias: bot-msg is included because 'U_BOT123' is in agentAllIds
+      const withAlias = await assemblePrompt(store2, 'c2', 'kael', 'Kael', {
+        addressedOnlyMode: true,
+        agentAliases: ['U_BOT123'],
+      });
+      expect(withAlias.messages.some(m => m.content.includes('deploy'))).toBe(true);
+    });
+
+    it('excludes side conversations the agent was not involved in', async () => {
+      // Alice and Bob chatting — no mention of kael
+      await store.append(makeMessage({ id: 'm1', participant: { kind: 'user', id: 'u1' }, content: 'lunch?' }));
+      await store.append(makeMessage({ id: 'm2', participant: { kind: 'user', id: 'u2' }, content: 'sure!' }));
+      // Carol mentions kael in the last message (triggering message always included)
+      await store.append(makeMessage({
+        id: 'm3',
+        participant: { kind: 'user', id: 'u3' },
+        content: 'kael can you help?',
+        metadata: { mentions: ['kael'] },
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', { addressedOnlyMode: true });
+      // Only m3 (involved) should be in the prompt
+      const contents = result.messages.map(m => m.content);
+      expect(contents.some(c => c.includes('lunch'))).toBe(false);
+      expect(contents.some(c => c.includes('kael can you help'))).toBe(true);
+    });
+
+    it('always includes the most recent message even if agent is not involved', async () => {
+      // A random message with no mention of kael — but it's the most recent
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'user', id: 'u1' },
+        content: 'hey everyone',
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', { addressedOnlyMode: true });
+      // The triggering (most recent) message is always included
+      expect(result.messages).toHaveLength(1);
+    });
+  });
+
+  describe('token budget', () => {
+    it('drops oldest messages when budget is exceeded', async () => {
+      // Each message is ~100 chars = ~25 tokens; budget of 40 tokens fits ~1-2 messages
+      for (let i = 1; i <= 5; i++) {
+        await store.append(makeMessage({
+          id: `m${i}`,
+          participant: { kind: 'user', id: 'u1', displayName: 'Alice' },
+          content: `${'x'.repeat(80)} message ${i}`,
+          timestamp: `2024-01-01T00:00:0${i}Z`,
+        }));
+      }
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', {
+        addressedOnlyMode: false,
+        tokenBudget: 30,
+      });
+
+      // Only the most recent message(s) that fit in 30 tokens should appear
+      expect(result.messages.length).toBeLessThan(5);
+      // The most recent message must be included
+      const lastContent = result.messages[result.messages.length - 1]?.content ?? '';
+      expect(lastContent).toContain('message 5');
+    });
+
+    it('always includes the triggering (most recent) message even if it alone exceeds the budget', async () => {
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'user', id: 'u1', displayName: 'Alice' },
+        content: 'x'.repeat(2000), // ~500 tokens — far over any small budget
+        timestamp: '2024-01-01T00:00:01Z',
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', {
+        addressedOnlyMode: false,
+        tokenBudget: 10, // tiny budget
+      });
+
+      // Must still include the single message, not return empty
+      expect(result.messages).toHaveLength(1);
+    });
+  });
+
+  describe('rolling summary', () => {
+    it('calls the summariser when turn count exceeds threshold', async () => {
+      for (let i = 1; i <= 6; i++) {
+        await store.append(makeMessage({
+          id: `m${i}`,
+          participant: { kind: 'user', id: 'u1', displayName: 'Alice' },
+          content: `message ${i}`,
+          timestamp: `2024-01-01T00:00:0${i}Z`,
+        }));
+      }
+
+      const mockSummariser = {
+        invokeAgent: vi.fn().mockResolvedValue({
+          output: JSON.stringify({
+            summary: 'Earlier messages discussed general topics.',
+            turnsSummarized: 3,
+            hasDecisions: false,
+            estimatedTokens: 20,
+          }),
+        }),
+      } as any;
+
+      const result = await assemblePrompt(
+        store,
+        'conv-1',
+        'kael',
+        'Kael',
+        { addressedOnlyMode: false, rollingSummaryThreshold: 4 },
+        mockSummariser
+      );
+
+      expect(mockSummariser.invokeAgent).toHaveBeenCalled();
+      expect(result.hasSummary).toBe(true);
+      // The assembled messages should include the summary entry
+      const summaryMsg = result.messages.find(m => m.content.includes('[Summary of'));
+      expect(summaryMsg).toBeDefined();
+      expect(summaryMsg?.role).toBe('system');
+    });
+
+    it('does not call summariser when turn count is under threshold', async () => {
+      await store.append(makeMessage({ id: 'm1', content: 'hello' }));
+      await store.append(makeMessage({ id: 'm2', content: 'world' }));
+
+      const mockSummariser = { invokeAgent: vi.fn() } as any;
+
+      const result = await assemblePrompt(
+        store,
+        'conv-1',
+        'kael',
+        'Kael',
+        { addressedOnlyMode: false, rollingSummaryThreshold: 10 },
+        mockSummariser
+      );
+
+      expect(mockSummariser.invokeAgent).not.toHaveBeenCalled();
+      expect(result.hasSummary).toBe(false);
+    });
+
+    it('falls back gracefully when summariser throws', async () => {
+      for (let i = 1; i <= 6; i++) {
+        await store.append(makeMessage({
+          id: `m${i}`,
+          content: `message ${i}`,
+          timestamp: `2024-01-01T00:00:0${i}Z`,
+        }));
+      }
+
+      const mockSummariser = {
+        invokeAgent: vi.fn().mockRejectedValue(new Error('LLM unavailable')),
+      } as any;
+
+      // Should not throw even if summariser fails
+      const result = await assemblePrompt(
+        store,
+        'conv-1',
+        'kael',
+        'Kael',
+        { addressedOnlyMode: false, rollingSummaryThreshold: 4 },
+        mockSummariser
+      );
+
+      expect(result.hasSummary).toBe(false);
+      // Still returns some messages
+      expect(result.messages.length).toBeGreaterThan(0);
+    });
+
+    it('persists the summary to the store and deletes summarised turns (gap #2)', async () => {
+      for (let i = 1; i <= 6; i++) {
+        await store.append(makeMessage({
+          id: `m${i}`,
+          content: `message ${i}`,
+          timestamp: `2024-01-01T00:00:0${i}Z`,
+        }));
+      }
+
+      const mockSummariser = {
+        invokeAgent: vi.fn().mockResolvedValue({
+          output: JSON.stringify({
+            summary: 'Earlier messages covered general topics.',
+            turnsSummarized: 3,
+            hasDecisions: false,
+            estimatedTokens: 20,
+          }),
+        }),
+      } as any;
+
+      await assemblePrompt(
+        store,
+        'conv-1',
+        'kael',
+        'Kael',
+        { addressedOnlyMode: false, rollingSummaryThreshold: 4 },
+        mockSummariser
+      );
+
+      const stored = await store.get('conv-1');
+
+      // The summarised turns (m1–m3, the first half) should have been removed.
+      const ids = stored.map(m => m.id);
+      expect(ids).not.toContain('m1');
+      expect(ids).not.toContain('m2');
+      expect(ids).not.toContain('m3');
+
+      // A persisted summary entry should be present.
+      const summaryEntry = stored.find(m => m.metadata?.isSummary);
+      expect(summaryEntry).toBeDefined();
+      expect(summaryEntry?.participant.kind).toBe('system');
+
+      // The recent turns (m4–m6, the second half) must still be there.
+      expect(ids).toContain('m4');
+      expect(ids).toContain('m5');
+      expect(ids).toContain('m6');
+    });
+
+    it('does not re-summarise an existing isSummary turn (gap #8)', async () => {
+      // Prime the store with an already-persisted summary + some new turns.
+      await store.append(makeMessage({
+        id: 'summary-old',
+        participant: { kind: 'system', id: 'summarizer' },
+        content: '[Summary of 3 earlier turns]: key context.',
+        timestamp: '2024-01-01T00:00:01Z',
+        metadata: { isSummary: true },
+      }));
+      for (let i = 2; i <= 6; i++) {
+        await store.append(makeMessage({
+          id: `m${i}`,
+          content: `message ${i}`,
+          timestamp: `2024-01-01T00:00:0${i}Z`,
+        }));
+      }
+
+      const mockSummariser = {
+        invokeAgent: vi.fn().mockResolvedValue({
+          output: JSON.stringify({
+            summary: 'New summary.',
+            turnsSummarized: 2,
+            hasDecisions: false,
+            estimatedTokens: 10,
+          }),
+        }),
+      } as any;
+
+      await assemblePrompt(
+        store,
+        'conv-1',
+        'kael',
+        'Kael',
+        { addressedOnlyMode: false, rollingSummaryThreshold: 4 },
+        mockSummariser
+      );
+
+      // The summariser should have been called, but only with the raw turns —
+      // not with the existing isSummary entry.
+      expect(mockSummariser.invokeAgent).toHaveBeenCalled();
+      const calledWith = mockSummariser.invokeAgent.mock.calls[0][0];
+      const turns = calledWith.data.turns as Array<{ id: string }>;
+      expect(turns.some(t => t.id === 'summary-old')).toBe(false);
+    });
+  });
+
+  describe('addressed-only mode — replied-next criterion (gap #3)', () => {
+    it('includes a message that was immediately replied to by the agent', async () => {
+      // u1 sends a message (no mention of kael)
+      await store.append(makeMessage({
+        id: 'm1',
+        participant: { kind: 'user', id: 'u1' },
+        content: 'anyone know the deploy status?',
+        timestamp: '2024-01-01T00:00:01Z',
+      }));
+      // kael replies next — so m1 should be included via "replied next"
+      await store.append(makeMessage({
+        id: 'm2',
+        participant: { kind: 'agent', id: 'kael' },
+        content: 'Deploy is done.',
+        timestamp: '2024-01-01T00:00:02Z',
+      }));
+      // unrelated side conversation
+      await store.append(makeMessage({
+        id: 'm3',
+        participant: { kind: 'user', id: 'u2' },
+        content: 'cool, thanks',
+        timestamp: '2024-01-01T00:00:03Z',
+      }));
+
+      const result = await assemblePrompt(store, 'conv-1', 'kael', 'Kael', {
+        addressedOnlyMode: true,
+      });
+
+      const contents = result.messages.map(m => m.content);
+      // m1 ("anyone know…") must be included because kael replied right after it
+      expect(contents.some(c => c.includes('deploy status'))).toBe(true);
+      // m2 (kael's reply) is included as the agent's own turn
+      expect(contents.some(c => c.includes('Deploy is done'))).toBe(true);
+      // m3 is the triggering (most recent) message — always included
+      expect(contents.some(c => c.includes('cool, thanks'))).toBe(true);
+    });
+  });
+});
+
+// ---------------------------------------------------------------------------
+// createConversationSearchTool
+// ---------------------------------------------------------------------------
+
+describe('createConversationSearchTool', () => {
+  let store: InMemoryConversationStore;
+
+  beforeEach(async () => {
+    store = new InMemoryConversationStore();
+    await store.append(makeMessage({ id: 'm1', content: 'deploy the service' }));
+    await store.append(makeMessage({ id: 'm2', content: 'the deployment failed' }));
+    await store.append(makeMessage({ id: 'm3', content: 'let\'s discuss lunch plans' }));
+  });
+
+  it('has the correct tool name and schema', () => {
+    const tool = createConversationSearchTool(store, 'conv-1');
+    expect(tool.name).toBe('search_conversation_history');
+    expect(tool.input_schema.required).toContain('query');
+  });
+
+  it('returns formatted results for matching messages', async () => {
+    const tool = createConversationSearchTool(store, 'conv-1');
+    const result = await tool.execute({ query: 'deploy' });
+
+    expect(result).toContain('deploy the service');
+    expect(result).toContain('deployment failed');
+    expect(result).not.toContain('lunch');
+  });
+
+  it('returns a "not found" message when no results match', async () => {
+    const tool = createConversationSearchTool(store, 'conv-1');
+    const result = await tool.execute({ query: 'zxqwerty' });
+
+    expect(result).toContain('No messages found');
+  });
+
+  it('returns an error message for an empty query', async () => {
+    const tool = createConversationSearchTool(store, 'conv-1');
+    const result = await tool.execute({ query: '' });
+
+    expect(result).toContain('Error');
+  });
+
+  it('is scope-locked — only searches the given conversationId', async () => {
+    await store.append(makeMessage({ id: 'm4', conversationId: 'conv-2', content: 'deploy from conv-2' }));
+
+    const tool = createConversationSearchTool(store, 'conv-1');
+    const result = await tool.execute({ query: 'deploy' });
+
+    // conv-2 message must not appear
+    expect(result).not.toContain('conv-2');
+  });
+
+  it('respects maxResults config', async () => {
+    const tool = createConversationSearchTool(store, 'conv-1', { maxResults: 1 });
+    const result = await tool.execute({ query: 'deploy' });
+
+    // With maxResults: 1, only one result should appear
+    const lines = result.split('\n').filter(l => l.startsWith('['));
+    expect(lines).toHaveLength(1);
+  });
+});
diff --git a/packages/toolpack-agents/src/history/index.ts b/packages/toolpack-agents/src/history/index.ts
new file mode 100644
index 0000000..0dc6633
--- /dev/null
+++ b/packages/toolpack-agents/src/history/index.ts
@@ -0,0 +1,23 @@
+export type {
+  ConversationScope,
+  StoredMessage,
+  GetOptions,
+  SearchOptions,
+  AssemblerOptions,
+  PromptMessage,
+  AssembledPrompt,
+  ConversationStore,
+} from './types.js';
+
+export {
+  InMemoryConversationStore,
+  type InMemoryConversationStoreConfig,
+} from './store.js';
+
+export { assemblePrompt } from './assembler.js';
+
+export {
+  createConversationSearchTool,
+  type ConversationSearchTool,
+  type ConversationSearchToolConfig,
+} from './search-tool.js';
diff --git a/packages/toolpack-agents/src/history/search-tool.ts b/packages/toolpack-agents/src/history/search-tool.ts
new file mode 100644
index 0000000..79cbc49
--- /dev/null
+++ b/packages/toolpack-agents/src/history/search-tool.ts
@@ -0,0 +1,138 @@
+import type { ConversationStore, ConversationSearchOptions as SearchOptions } from 'toolpack-sdk';
+
+/**
+ * Configuration for the conversation search tool.
+ */
+export interface ConversationSearchToolConfig {
+  /**
+   * Maximum number of results the tool can return.
+   * Prevents the model from expanding context unboundedly.
+   * Default: 10.
+   */
+  maxResults?: number;
+
+  /**
+   * Rough token cap for the total search results returned.
+   * Results are dropped (whole messages, newest-first) once the running
+   * token count would exceed this cap. The first matching message is
+   * always included even if it alone exceeds the cap.
+   * Default: 2000.
+   */
+  tokenCap?: number;
+}
+
+/**
+ * A tool definition compatible with the Toolpack / Anthropic tool-use format.
+ */
+export interface ConversationSearchTool {
+  name: string;
+  description: string;
+  input_schema: {
+    type: 'object';
+    properties: Record<string, { type: string; description: string }>;
+    required: string[];
+  };
+  /**
+   * Execute the tool with the given input.
+   * Returns a plain-text result ready to pass back as a tool result message.
+   */
+  execute: (input: { query: string }) => Promise<string>;
+}
+
+/**
+ * Creates a conversation search tool that the LLM can call during reasoning.
+ *
+ * The tool is **scope-locked** — it only searches the provided `conversationId`
+ * and never crosses conversation boundaries.
+ *
+ * Results are **token-capped** — the store truncates content to fit within
+ * `tokenCap` so the model cannot expand its context window by searching
+ * repeatedly.
+ *
+ * @param store          The conversation store to search against.
+ * @param conversationId The current conversation id (scope lock).
+ * @param config         Optional tuning (maxResults, tokenCap).
+ *
+ * @example
+ * ```ts
+ * const tool = createConversationSearchTool(store, input.conversationId, {
+ *   maxResults: 5,
+ *   tokenCap: 1500,
+ * });
+ *
+ * // Pass to the LLM as a tool definition:
+ * const response = await llm.chat(messages, { tools: [tool] });
+ *
+ * // When the model calls the tool:
+ * if (response.toolCall?.name === tool.name) {
+ *   const result = await tool.execute(response.toolCall.input);
+ *   // Feed result back as a tool result message...
+ * }
+ * ```
+ */
+export function createConversationSearchTool(
+  store: ConversationStore,
+  conversationId: string,
+  config: ConversationSearchToolConfig = {}
+): ConversationSearchTool {
+  const maxResults = config.maxResults ?? 10;
+  const tokenCap = config.tokenCap ?? 2000;
+
+  const searchOptions: SearchOptions = { limit: maxResults, tokenCap };
+
+  return {
+    name: 'search_conversation_history',
+
+    description: [
+      'Search the conversation history for messages matching a query.',
+      'Use this when you need to recall something specific that was said earlier',
+      'in this conversation but is not in your immediate context.',
+      'Results are limited to this conversation only.',
+    ].join(' '),
+
+    input_schema: {
+      type: 'object',
+      properties: {
+        query: {
+          type: 'string',
+          description: 'The search query — keywords or phrases to look for in the conversation history.',
+        },
+      },
+      required: ['query'],
+    },
+
+    execute: async ({ query }: { query: string }): Promise<string> => {
+      if (!query || query.trim() === '') {
+        return 'Error: query must not be empty.';
+      }
+
+      const results = await store.search(
+        conversationId,
+        query.trim(),
+        searchOptions
+      );
+
+      if (results.length === 0) {
+        return `No messages found matching "${query}".`;
+      }
+
+      const lines = results.map(msg => {
+        const name = msg.participant.displayName ?? msg.participant.id;
+        const label = msg.participant.kind === 'agent' ? `${name} (agent)` : name;
+        const date = new Date(msg.timestamp).toLocaleString('en-US', {
+          month: 'short',
+          day: 'numeric',
+          hour: '2-digit',
+          minute: '2-digit',
+        });
+        return `[${date}] ${label}: ${msg.content}`;
+      });
+
+      return [
+        `Found ${results.length} result(s) for "${query}":`,
+        '',
+        ...lines,
+      ].join('\n');
+    },
+  };
+}
diff --git a/packages/toolpack-agents/src/history/store.ts b/packages/toolpack-agents/src/history/store.ts
new file mode 100644
index 0000000..7f82361
--- /dev/null
+++ b/packages/toolpack-agents/src/history/store.ts
@@ -0,0 +1,5 @@
+// Re-exported from toolpack-sdk.
+export {
+  InMemoryConversationStore,
+  type InMemoryConversationStoreConfig,
+} from 'toolpack-sdk';
diff --git a/packages/toolpack-agents/src/history/types.ts b/packages/toolpack-agents/src/history/types.ts
new file mode 100644
index 0000000..c1091e1
--- /dev/null
+++ b/packages/toolpack-agents/src/history/types.ts
@@ -0,0 +1,12 @@
+// Re-exported from toolpack-sdk so consumers of toolpack-agents can import
+// directly from this package without knowing the types moved to the SDK.
+export type {
+  ConversationScope,
+  StoredMessage,
+  GetOptions,
+  ConversationSearchOptions as SearchOptions,
+  AssemblerOptions,
+  PromptMessage,
+  AssembledPrompt,
+  ConversationStore,
+} from 'toolpack-sdk';
diff --git a/packages/toolpack-agents/src/index.ts b/packages/toolpack-agents/src/index.ts
new file mode 100644
index 0000000..abd6442
--- /dev/null
+++ b/packages/toolpack-agents/src/index.ts
@@ -0,0 +1,115 @@
+// Agent layer for Toolpack SDK
+// Build, compose, and deploy AI agents with a consistent, extensible pattern
+
+// Core agent types and classes
+export {
+  AgentInput,
+  AgentResult,
+  AgentOutput,
+  AgentRunOptions,
+  BaseAgentOptions,
+  WorkflowStep,
+  IAgentRegistry,
+  AgentInstance,
+  ChannelInterface,
+  PendingAsk,
+  Participant,
+} from './agent/types.js';
+
+export { BaseAgent, AgentEvents } from './agent/base-agent.js';
+export { AgentRegistry } from './agent/agent-registry.js';
+export { AgentError } from './agent/errors.js';
+
+// Built-in agents
+export { ResearchAgent } from './agents/research-agent.js';
+export { CodingAgent } from './agents/coding-agent.js';
+export { DataAgent } from './agents/data-agent.js';
+export { BrowserAgent } from './agents/browser-agent.js';
+
+// Channel base class and implementations
+export { BaseChannel } from './channels/base-channel.js';
+export { SlackChannel, SlackChannelConfig } from './channels/slack-channel.js';
+export { WebhookChannel, WebhookChannelConfig } from './channels/webhook-channel.js';
+export { ScheduledChannel, ScheduledChannelConfig } from './channels/scheduled-channel.js';
+export { TelegramChannel, TelegramChannelConfig } from './channels/telegram-channel.js';
+export { DiscordChannel, DiscordChannelConfig } from './channels/discord-channel.js';
+export { EmailChannel, EmailChannelConfig } from './channels/email-channel.js';
+export { SMSChannel, SMSChannelConfig } from './channels/sms-channel.js';
+
+// Transport layer for agent-to-agent communication
+export {
+  AgentTransport,
+  AgentRegistryTransportOptions,
+  LocalTransport,
+  JsonRpcTransport,
+  AgentJsonRpcServer,
+} from './transport/index.js';
+
+// Capability agents for cross-cutting concerns (interceptors, summarization)
+export {
+  IntentClassifierAgent,
+  IntentClassifierInput,
+  IntentClassification,
+  SummarizerAgent,
+  SummarizerInput,
+  SummarizerOutput,
+  HistoryTurn,
+} from './capabilities/index.js';
+// Participant is now a core type in agent/types.ts (exported above).
+
+// Conversation history — storage, assembly, and retrieval
+export {
+  type ConversationScope,
+  type StoredMessage,
+  type GetOptions,
+  type SearchOptions,
+  type AssemblerOptions,
+  type PromptMessage,
+  type AssembledPrompt,
+  type ConversationStore,
+  InMemoryConversationStore,
+  type InMemoryConversationStoreConfig,
+  assemblePrompt,
+  createConversationSearchTool,
+  type ConversationSearchTool,
+  type ConversationSearchToolConfig,
+} from './history/index.js';
+
+// Interceptor system for composable middleware
+export {
+  SKIP_SENTINEL,
+  type InterceptorResult,
+  type InterceptorContext,
+  type NextFunction,
+  type Interceptor,
+  type InterceptorChainConfig,
+  type ComposedChain,
+  isSkipSentinel,
+  skip,
+  InvocationDepthExceededError,
+  composeChain,
+  executeChain,
+  // Built-in interceptors
+  createEventDedupInterceptor,
+  type EventDedupConfig,
+  createNoiseFilterInterceptor,
+  type NoiseFilterConfig,
+  createSelfFilterInterceptor,
+  type SelfFilterConfig,
+  createRateLimitInterceptor,
+  type RateLimitConfig,
+  createParticipantResolverInterceptor,
+  type ParticipantResolverConfig,
+  createCaptureInterceptor,
+  type CaptureHistoryConfig,
+  createAddressCheckInterceptor,
+  type AddressCheckConfig,
+  type AddressCheckResult,
+  createIntentClassifierInterceptor,
+  type IntentClassifierInterceptorConfig,
+  createDepthGuardInterceptor,
+  type DepthGuardConfig,
+  DepthExceededError,
+  createTracerInterceptor,
+  type TracerConfig,
+} from './interceptors/index.js';
diff --git a/packages/toolpack-agents/src/interceptors/builtins/address-check.ts b/packages/toolpack-agents/src/interceptors/builtins/address-check.ts
new file mode 100644
index 0000000..a60a4d9
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/address-check.ts
@@ -0,0 +1,226 @@
+import type { AgentInput } from '../../agent/types.js';
+import type { Interceptor, InterceptorContext, InterceptorResult, NextFunction } from '../types.js';
+
+/**
+ * Check if the agent's name appears only inside code regions (fenced blocks
+ * ``` ``` ``` ``` or inline backticks `` ` ``).
+ *
+ * Returns true if:
+ * - The agent name is inside at least one code region AND
+ * - The agent name does NOT appear outside code regions
+ *
+ * Returns false if:
+ * - The agent name is not present at all
+ * - There are no code regions
+ * - The agent name also appears outside code regions
+ */
+export function isAgentNameOnlyInCodeBlocks(message: string, agentName: string): boolean {
+  const agentNameLower = agentName.toLowerCase();
+  const messageLower = message.toLowerCase();
+
+  // Agent name must be present at all
+  if (!messageLower.includes(agentNameLower)) {
+    return false;
+  }
+
+  // Find all code regions: fenced ``` ``` blocks first (multiline), then inline `…`.
+  // We collect [start, end) ranges so we can strip by position (handles duplicates).
+  const ranges: Array<[number, number]> = [];
+
+  const fencedRegex = /```[\s\S]*?```/g;
+  let m: RegExpExecArray | null;
+  while ((m = fencedRegex.exec(message)) !== null) {
+    ranges.push([m.index, m.index + m[0].length]);
+  }
+
+  const inlineRegex = /`[^`\n]*`/g;
+  while ((m = inlineRegex.exec(message)) !== null) {
+    const start = m.index;
+    const end = start + m[0].length;
+    // Skip if already covered by a fenced block
+    const coveredByFence = ranges.some(([s, e]) => start >= s && end <= e);
+    if (!coveredByFence) {
+      ranges.push([start, end]);
+    }
+  }
+
+  // No code regions - not an "only in code" case
+  if (ranges.length === 0) {
+    return false;
+  }
+
+  // Build text outside code regions by stripping ranges in order.
+  // Sort ranges ascending and walk through the message collecting gaps.
+  ranges.sort((a, b) => a[0] - b[0]);
+  let outsideText = '';
+  let cursor = 0;
+  for (const [start, end] of ranges) {
+    if (start > cursor) {
+      outsideText += message.slice(cursor, start);
+    }
+    cursor = Math.max(cursor, end);
+  }
+  if (cursor < message.length) {
+    outsideText += message.slice(cursor);
+  }
+
+  const outsideCodeBlock = outsideText.toLowerCase().includes(agentNameLower);
+
+  // If it's anywhere outside code regions, it's not "only in code"
+  if (outsideCodeBlock) {
+    return false;
+  }
+
+  // Confirm it's actually inside at least one code region
+  const inCodeBlock = ranges.some(([s, e]) =>
+    message.slice(s, e).toLowerCase().includes(agentNameLower)
+  );
+
+  return inCodeBlock;
+}
+
+/**
+ * Classification result from address checking.
+ */
+export type AddressCheckResult =
+  | 'direct'      // Clearly addressed to agent (@mention, name in greeting)
+  | 'indirect'    // Mentioned but unclear
+  | 'passive'     // Not addressed, should listen only
+  | 'ignore'      // Definitely not for agent
+  | 'ambiguous';  // Needs LLM classification
+
+/**
+ * Configuration for the address-check rules interceptor.
+ */
+export interface AddressCheckConfig {
+  /** The agent's display name (e.g., "Assistant") */
+  agentName: string;
+
+  /** The agent's ID/slack ID (e.g., "U123456") */
+  agentId?: string;
+
+  /** Function to extract message text from input */
+  getMessageText: (input: AgentInput) => string | undefined;
+
+  /** Optional: Check if input is a direct message (DM) */
+  isDirectMessage?: (input: AgentInput) => boolean;
+
+  /** Optional: Extract mentioned user IDs from message */
+  getMentions?: (input: AgentInput) => string[];
+
+  /** Optional callback when classification is made */
+  onClassified?: (result: AddressCheckResult, input: AgentInput) => void;
+}
+
+/**
+ * Creates an address-check rules interceptor.
+ *
+ * Stage-3 rule-based classifier:
+ * - Vocative detection ("Hey Assistant...")
+ * - Possessive patterns ("my Assistant...")
+ * - Code/URL detection (likely not addressing)
+ * - Co-mention detection
+ *
+ * Returns 'ambiguous' for cases that need LLM classification by intent-classifier.
+ *
+ * @example
+ * ```ts
+ * const registry = new AgentRegistry([
+ *   {
+ *     agent: MyAgent,
+ *     channels: [slackChannel],
+ *     interceptors: [
+ *       createAddressCheckInterceptor({
+ *         agentName: 'Assistant',
+ *         agentId: 'U123456',
+ *         getMessageText: (input) => input.message || ''
+ *       })
+ *     ]
+ *   }
+ * ]);
+ * ```
+ */
+export function createAddressCheckInterceptor(config: AddressCheckConfig): Interceptor {
+  return async (input: AgentInput, ctx: InterceptorContext, next: NextFunction): Promise<InterceptorResult> => {
+    const messageText = config.getMessageText(input) ?? '';
+
+    // Check for direct message (always direct)
+    if (config.isDirectMessage?.(input)) {
+      const enrichedInput: AgentInput = {
+        ...input,
+        context: {
+          ...input.context,
+          _addressCheck: 'direct' as AddressCheckResult,
+          _isDM: true,
+        },
+      };
+      config.onClassified?.('direct', input);
+      return await next(enrichedInput);
+    }
+
+    // Rule-based classification
+    let result: AddressCheckResult = 'ambiguous';
+
+    const lowerMessage = messageText.toLowerCase();
+    const agentNameLower = config.agentName.toLowerCase();
+    // Escape regex metacharacters so names like "agent.v2" or "c++" work correctly.
+    const escapeRegex = (s: string) => s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+    const escapedName = escapeRegex(agentNameLower);
+    const idPart = config.agentId ? `|^@${escapeRegex(config.agentId)}\\b` : '';
+
+    // Check 1: @mention or explicit name in greeting (direct)
+    const vocativePattern = new RegExp(`^(hey\\s+)?@?${escapedName}\\b${idPart}`, 'i');
+    if (vocativePattern.test(lowerMessage)) {
+      result = 'direct';
+    }
+    // Check 2: Possessive patterns (ambiguous - talking ABOUT the agent, not necessarily TO it)
+    // Examples: "the assistant mentioned earlier", "our assistant logged that"
+    else if (new RegExp(`\\b(my|our|the)\\s+${escapedName}\\b`, 'i').test(lowerMessage)) {
+      result = 'ambiguous';
+    }
+    // Check 3: Code blocks — only ignore if agent name is EXCLUSIVELY inside code blocks
+    // Example: "check this: ```error in kael system```" → ignore (name only in code)
+    // Example: "hey kael, here's my error: ```stack trace```" → continue (name outside code)
+    else if (isAgentNameOnlyInCodeBlocks(messageText, config.agentName)) {
+      result = 'ignore';
+    }
+    // Check 4: URLs as entire message (ignore)
+    else if (/^https?:\/\//.test(messageText)) {
+      result = 'ignore';
+    }
+    // Check 5: Co-mention check (indirect if others mentioned)
+    else if (config.getMentions) {
+      const mentions = config.getMentions(input);
+      const agentMentioned = mentions.some(
+        m => m.toLowerCase() === agentNameLower || m === config.agentId
+      );
+      if (agentMentioned && mentions.length > 1) {
+        result = 'indirect';
+      } else if (agentMentioned) {
+        result = 'ambiguous';
+      }
+    }
+    // Check 6: Simple name mention (ambiguous - needs LLM)
+    else if (lowerMessage.includes(agentNameLower)) {
+      result = 'ambiguous';
+    }
+    // No mention detected (passive)
+    else {
+      result = 'passive';
+    }
+
+    // Enrich input with classification result
+    const enrichedInput: AgentInput = {
+      ...input,
+      context: {
+        ...input.context,
+        _addressCheck: result,
+      },
+    };
+
+    config.onClassified?.(result, input);
+    ctx.logger?.debug(`Address check classified as: ${result}`, { result });
+
+    return await next(enrichedInput);
+  };
+}
diff --git a/packages/toolpack-agents/src/interceptors/builtins/builtins.test.ts b/packages/toolpack-agents/src/interceptors/builtins/builtins.test.ts
new file mode 100644
index 0000000..da0af11
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/builtins.test.ts
@@ -0,0 +1,1096 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import type { AgentInput, AgentResult, AgentInstance, ChannelInterface, IAgentRegistry } from '../../agent/types.js';
+import { composeChain, executeChain } from '../chain.js';
+import { SKIP_SENTINEL, isSkipSentinel, type Interceptor } from '../types.js';
+
+import { createEventDedupInterceptor } from './event-dedup.js';
+import { createNoiseFilterInterceptor } from './noise-filter.js';
+import { createSelfFilterInterceptor } from './self-filter.js';
+import { createRateLimitInterceptor } from './rate-limit.js';
+import { createParticipantResolverInterceptor } from './participant-resolver.js';
+import { createAddressCheckInterceptor, isAgentNameOnlyInCodeBlocks, type AddressCheckResult } from './address-check.js';
+import { createDepthGuardInterceptor, DepthExceededError } from './depth-guard.js';
+import { createTracerInterceptor } from './tracer.js';
+import { createIntentClassifierInterceptor } from './intent-classifier.js';
+
+// ---------- Test helpers ----------
+
+function createMockAgent(name: string, result: AgentResult = { output: 'ok' }): AgentInstance {
+  return {
+    name,
+    description: `Mock ${name}`,
+    mode: 'chat',
+    invokeAgent: vi.fn().mockResolvedValue(result),
+  } as unknown as AgentInstance;
+}
+
+function createMockChannel(name: string = 'test-channel'): ChannelInterface {
+  return {
+    name,
+    isTriggerChannel: false,
+    listen: vi.fn(),
+    send: vi.fn().mockResolvedValue(undefined),
+    normalize: vi.fn(),
+    onMessage: vi.fn(),
+  };
+}
+
+function createMockRegistry(agents: Map<string, AgentInstance> = new Map()): IAgentRegistry {
+  return {
+    start: vi.fn(),
+    sendTo: vi.fn().mockResolvedValue(undefined),
+    getAgent: vi.fn((name: string) => agents.get(name)),
+    getAllAgents: vi.fn(() => Array.from(agents.values())),
+    getPendingAsk: vi.fn(),
+    addPendingAsk: vi.fn(),
+    resolvePendingAsk: vi.fn().mockResolvedValue(undefined),
+    hasPendingAsks: vi.fn(),
+    incrementRetries: vi.fn(),
+    cleanupExpiredAsks: vi.fn().mockReturnValue(0),
+  } as unknown as IAgentRegistry;
+}
+
+/**
+ * Run a single interceptor with a minimal chain setup and return the chain's result.
+ */
+async function runInterceptor(
+  interceptor: Interceptor,
+  input: AgentInput,
+  agentResult: AgentResult = { output: 'agent-ran' }
+) {
+  const agent = createMockAgent('test-agent', agentResult);
+  const channel = createMockChannel();
+  const registry = createMockRegistry();
+  const chain = composeChain([interceptor], agent, channel, registry);
+  const result = await executeChain(chain, input);
+  return { result, agent, channel, registry };
+}
+
+// ---------- event-dedup ----------
+
+describe('createEventDedupInterceptor', () => {
+  it('allows first occurrence of an event through', async () => {
+    const interceptor = createEventDedupInterceptor();
+    const input: AgentInput = {
+      message: 'hi',
+      conversationId: 'c1',
+      context: { eventId: 'evt-1' },
+    };
+    const { result, agent } = await runInterceptor(interceptor, input);
+
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+    expect(result).not.toBeNull();
+  });
+
+  it('skips duplicate events', async () => {
+    const interceptor = createEventDedupInterceptor();
+    const onDuplicate = vi.fn();
+    const dedupWithCb = createEventDedupInterceptor({ onDuplicate });
+
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([dedupWithCb], agent, createMockChannel(), createMockRegistry());
+    const input: AgentInput = {
+      message: 'hi',
+      conversationId: 'c1',
+      context: { eventId: 'evt-1' },
+    };
+
+    const first = await executeChain(chain, input);
+    const second = await executeChain(chain, input);
+
+    expect(first).not.toBeNull();
+    expect(second).toBeNull(); // skipped
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+    expect(onDuplicate).toHaveBeenCalledWith('evt-1', input);
+  });
+
+  it('treats missing eventId as always fresh', async () => {
+    const interceptor = createEventDedupInterceptor();
+    const input: AgentInput = { message: 'hi', conversationId: 'c1' };
+
+    const { result: r1 } = await runInterceptor(interceptor, input);
+    const { result: r2 } = await runInterceptor(interceptor, input);
+
+    expect(r1).not.toBeNull();
+    expect(r2).not.toBeNull();
+  });
+
+  it('evicts oldest entries when maxCacheSize reached (LRU)', async () => {
+    const interceptor = createEventDedupInterceptor({ maxCacheSize: 2 });
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor], agent, createMockChannel(), createMockRegistry());
+
+    const make = (id: string): AgentInput => ({
+      message: 'hi',
+      conversationId: 'c1',
+      context: { eventId: id },
+    });
+
+    // Fill cache to capacity with a and b, then c should evict a.
+    await executeChain(chain, make('a'));
+    await executeChain(chain, make('b'));
+    await executeChain(chain, make('c')); // evicts 'a', cache now {b, c}
+
+    // b and c are cached → duplicates should skip
+    const reB = await executeChain(chain, make('b'));
+    const reC = await executeChain(chain, make('c'));
+    expect(reB).toBeNull();
+    expect(reC).toBeNull();
+
+    // a was evicted → should be allowed through as fresh
+    const reA = await executeChain(chain, make('a'));
+    expect(reA).not.toBeNull();
+  });
+
+  it('supports custom getEventId', async () => {
+    const interceptor = createEventDedupInterceptor({
+      getEventId: (input) => input.message,
+    });
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor], agent, createMockChannel(), createMockRegistry());
+
+    const r1 = await executeChain(chain, { message: 'hello', conversationId: 'c1' });
+    const r2 = await executeChain(chain, { message: 'hello', conversationId: 'c1' });
+
+    expect(r1).not.toBeNull();
+    expect(r2).toBeNull();
+  });
+});
+
+// ---------- noise-filter ----------
+
+describe('createNoiseFilterInterceptor', () => {
+  it('drops messages with denied subtype', async () => {
+    const onFiltered = vi.fn();
+    const interceptor = createNoiseFilterInterceptor({
+      denySubtypes: ['message_changed', 'bot_message'],
+      onFiltered,
+    });
+
+    const input: AgentInput = {
+      message: 'edited',
+      conversationId: 'c1',
+      context: { subtype: 'message_changed' },
+    };
+    const { result, agent } = await runInterceptor(interceptor, input);
+
+    expect(result).toBeNull();
+    expect(agent.invokeAgent).not.toHaveBeenCalled();
+    expect(onFiltered).toHaveBeenCalledWith('message_changed', input);
+  });
+
+  it('passes through messages without denied subtype', async () => {
+    const interceptor = createNoiseFilterInterceptor({
+      denySubtypes: ['message_changed'],
+    });
+    const input: AgentInput = {
+      message: 'hi',
+      conversationId: 'c1',
+      context: { subtype: 'regular' },
+    };
+    const { result, agent } = await runInterceptor(interceptor, input);
+
+    expect(result).not.toBeNull();
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+  });
+
+  it('passes through when subtype is missing', async () => {
+    const interceptor = createNoiseFilterInterceptor({ denySubtypes: ['x'] });
+    const { result, agent } = await runInterceptor(interceptor, {
+      message: 'hi',
+      conversationId: 'c1',
+    });
+    expect(result).not.toBeNull();
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+  });
+
+  it('supports custom getSubtype', async () => {
+    const interceptor = createNoiseFilterInterceptor({
+      denySubtypes: ['noisy'],
+      getSubtype: (input) => input.intent,
+    });
+    const { result } = await runInterceptor(interceptor, {
+      message: 'hi',
+      conversationId: 'c1',
+      intent: 'noisy',
+    });
+    expect(result).toBeNull();
+  });
+});
+
+// ---------- self-filter ----------
+
+describe('createSelfFilterInterceptor', () => {
+  it('drops messages where sender is agent itself (via agentId config)', async () => {
+    const onSelfMessage = vi.fn();
+    const interceptor = createSelfFilterInterceptor({
+      agentId: 'U0123456',
+      getSenderId: (input) => input.context?.senderId as string | undefined,
+      onSelfMessage,
+    });
+    const input: AgentInput = {
+      message: 'loop?',
+      conversationId: 'c1',
+      context: { senderId: 'U0123456' },
+    };
+    const { result, agent } = await runInterceptor(interceptor, input);
+
+    expect(result).toBeNull();
+    expect(agent.invokeAgent).not.toHaveBeenCalled();
+    expect(onSelfMessage).toHaveBeenCalledWith('U0123456', input);
+  });
+
+  it('falls back to agent name when agentId not provided', async () => {
+    const interceptor = createSelfFilterInterceptor({
+      getSenderId: (input) => input.context?.senderId as string | undefined,
+    });
+    const agent = createMockAgent('my-bot');
+    const chain = composeChain([interceptor], agent, createMockChannel(), createMockRegistry());
+    const input: AgentInput = {
+      message: 'loop?',
+      conversationId: 'c1',
+      context: { senderId: 'my-bot' },
+    };
+    const result = await executeChain(chain, input);
+    expect(result).toBeNull();
+  });
+
+  it('passes through messages from other senders', async () => {
+    const interceptor = createSelfFilterInterceptor({
+      agentId: 'U0123456',
+      getSenderId: (input) => input.context?.senderId as string | undefined,
+    });
+    const { result, agent } = await runInterceptor(interceptor, {
+      message: 'hi',
+      conversationId: 'c1',
+      context: { senderId: 'U9999999' },
+    });
+
+    expect(result).not.toBeNull();
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+  });
+
+  it('passes through when sender ID is missing', async () => {
+    const interceptor = createSelfFilterInterceptor({
+      agentId: 'U0123456',
+      getSenderId: () => undefined,
+    });
+    const { result } = await runInterceptor(interceptor, { message: 'hi', conversationId: 'c1' });
+    expect(result).not.toBeNull();
+  });
+});
+
+// ---------- rate-limit ----------
+
+describe('createRateLimitInterceptor', () => {
+  beforeEach(() => {
+    vi.useFakeTimers();
+  });
+
+  afterEach(() => {
+    vi.useRealTimers();
+  });
+
+  it('allows requests up to the token limit', async () => {
+    const interceptor = createRateLimitInterceptor({
+      getKey: () => 'user-1',
+      tokensPerInterval: 3,
+      interval: 60000,
+    });
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor], agent, createMockChannel(), createMockRegistry());
+
+    const input: AgentInput = { message: 'hi', conversationId: 'c1' };
+
+    const r1 = await executeChain(chain, input);
+    const r2 = await executeChain(chain, input);
+    const r3 = await executeChain(chain, input);
+
+    expect(r1).not.toBeNull();
+    expect(r2).not.toBeNull();
+    expect(r3).not.toBeNull();
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(3);
+  });
+
+  it('skips requests after tokens exhausted (onExceeded=skip)', async () => {
+    const onRateLimited = vi.fn();
+    const interceptor = createRateLimitInterceptor({
+      getKey: () => 'user-1',
+      tokensPerInterval: 2,
+      interval: 60000,
+      onExceeded: 'skip',
+      onRateLimited,
+    });
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor], agent, createMockChannel(), createMockRegistry());
+
+    await executeChain(chain, { message: 'a', conversationId: 'c1' });
+    await executeChain(chain, { message: 'b', conversationId: 'c1' });
+    const r3 = await executeChain(chain, { message: 'c', conversationId: 'c1' });
+
+    expect(r3).toBeNull();
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(2);
+    expect(onRateLimited).toHaveBeenCalledTimes(1);
+    expect(onRateLimited.mock.calls[0][0]).toBe('user-1');
+  });
+
+  it('throws when exceeded (onExceeded=reject)', async () => {
+    const interceptor = createRateLimitInterceptor({
+      getKey: () => 'user-1',
+      tokensPerInterval: 1,
+      interval: 60000,
+      onExceeded: 'reject',
+    });
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor], agent, createMockChannel(), createMockRegistry());
+
+    await executeChain(chain, { message: 'a', conversationId: 'c1' });
+    await expect(
+      executeChain(chain, { message: 'b', conversationId: 'c1' })
+    ).rejects.toThrow(/rate limit/i);
+  });
+
+  it('refills tokens after interval elapses', async () => {
+    const interceptor = createRateLimitInterceptor({
+      getKey: () => 'user-1',
+      tokensPerInterval: 2,
+      interval: 60000,
+    });
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor], agent, createMockChannel(), createMockRegistry());
+
+    await executeChain(chain, { message: 'a', conversationId: 'c1' });
+    await executeChain(chain, { message: 'b', conversationId: 'c1' });
+    const exhausted = await executeChain(chain, { message: 'c', conversationId: 'c1' });
+    expect(exhausted).toBeNull();
+
+    // Advance time by one full interval so the bucket refills.
+    vi.advanceTimersByTime(60000);
+
+    const afterRefill = await executeChain(chain, { message: 'd', conversationId: 'c1' });
+    expect(afterRefill).not.toBeNull();
+  });
+
+  it('tracks separate buckets per key', async () => {
+    const interceptor = createRateLimitInterceptor({
+      getKey: (input) => input.context?.userId as string,
+      tokensPerInterval: 1,
+      interval: 60000,
+    });
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor], agent, createMockChannel(), createMockRegistry());
+
+    const u1 = await executeChain(chain, {
+      message: 'hi',
+      conversationId: 'c1',
+      context: { userId: 'u1' },
+    });
+    const u2 = await executeChain(chain, {
+      message: 'hi',
+      conversationId: 'c1',
+      context: { userId: 'u2' },
+    });
+    const u1Again = await executeChain(chain, {
+      message: 'hi',
+      conversationId: 'c1',
+      context: { userId: 'u1' },
+    });
+
+    expect(u1).not.toBeNull();
+    expect(u2).not.toBeNull();
+    expect(u1Again).toBeNull(); // u1 bucket exhausted
+  });
+
+  it('respects maxBuckets via LRU eviction', async () => {
+    // With maxBuckets=2, the third key should evict the least-recently-used bucket.
+    const interceptor = createRateLimitInterceptor({
+      getKey: (input) => input.context?.userId as string,
+      tokensPerInterval: 1,
+      interval: 60000,
+      maxBuckets: 2,
+    });
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor], agent, createMockChannel(), createMockRegistry());
+
+    const call = (userId: string) =>
+      executeChain(chain, {
+        message: 'hi',
+        conversationId: 'c1',
+        context: { userId },
+      });
+
+    await call('u1'); // u1 bucket created, 1 token consumed
+    await call('u2'); // u2 bucket created
+    // u1 exhausted locally: second call should skip
+    const u1Second = await call('u1');
+    expect(u1Second).toBeNull();
+
+    // Now add u3. This evicts the LRU bucket. 'u1' was used most recently (via u1Second).
+    // So u2 should be evicted.
+    await call('u3');
+
+    // u2 was evicted, so its next request gets a fresh bucket and succeeds.
+    const u2Fresh = await call('u2');
+    expect(u2Fresh).not.toBeNull();
+  });
+});
+
+// ---------- participant-resolver ----------
+
+describe('createParticipantResolverInterceptor', () => {
+  /** Capture the input that reaches downstream for assertions. */
+  function captureDownstream() {
+    let captured: AgentInput | undefined;
+    const downstream: Interceptor = async (input, _ctx, next) => {
+      captured = input;
+      return await next();
+    };
+    return { downstream, get: () => captured };
+  }
+
+  it('enriches input with first-class participant field when explicit resolver returns one', async () => {
+    const onResolved = vi.fn();
+    const participant = { kind: 'user' as const, id: 'u1', displayName: 'Alice' };
+
+    const interceptor = createParticipantResolverInterceptor({
+      resolveParticipant: () => participant,
+      onResolved,
+    });
+
+    const { downstream, get } = captureDownstream();
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor, downstream], agent, createMockChannel(), createMockRegistry());
+    await executeChain(chain, { message: 'hi', conversationId: 'c1' });
+
+    expect(get()?.participant).toEqual(participant);
+    // Legacy context slot is also populated for back-compat
+    expect(get()?.context?._participant).toEqual(participant);
+    expect(onResolved).toHaveBeenCalled();
+  });
+
+  it('awaits async explicit resolver', async () => {
+    const participant = { kind: 'user' as const, id: 'u2', displayName: 'Bob' };
+    const interceptor = createParticipantResolverInterceptor({
+      resolveParticipant: async () => participant,
+    });
+
+    const { downstream, get } = captureDownstream();
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor, downstream], agent, createMockChannel(), createMockRegistry());
+    await executeChain(chain, { message: 'hi', conversationId: 'c1' });
+
+    expect(get()?.participant).toEqual(participant);
+  });
+
+  it("falls back to ctx.channel.resolveParticipant when no explicit resolver is provided", async () => {
+    const resolved = { kind: 'user' as const, id: 'u3', displayName: 'Carol' };
+    const interceptor = createParticipantResolverInterceptor(); // no config
+
+    const channel = createMockChannel();
+    channel.resolveParticipant = vi.fn().mockResolvedValue(resolved);
+
+    const { downstream, get } = captureDownstream();
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor, downstream], agent, channel, createMockRegistry());
+    await executeChain(chain, { message: 'hi', conversationId: 'c1' });
+
+    expect(channel.resolveParticipant).toHaveBeenCalled();
+    expect(get()?.participant).toEqual(resolved);
+  });
+
+  it("explicit resolver takes precedence over channel.resolveParticipant", async () => {
+    const channelResolved = { kind: 'user' as const, id: 'channel-id', displayName: 'FromChannel' };
+    const explicitResolved = { kind: 'user' as const, id: 'explicit-id', displayName: 'FromConfig' };
+
+    const channel = createMockChannel();
+    channel.resolveParticipant = vi.fn().mockResolvedValue(channelResolved);
+
+    const interceptor = createParticipantResolverInterceptor({
+      resolveParticipant: () => explicitResolved,
+    });
+
+    const { downstream, get } = captureDownstream();
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor, downstream], agent, channel, createMockRegistry());
+    await executeChain(chain, { message: 'hi', conversationId: 'c1' });
+
+    expect(channel.resolveParticipant).not.toHaveBeenCalled();
+    expect(get()?.participant).toEqual(explicitResolved);
+  });
+
+  it('preserves existing input.participant from normalize() when no resolver available', async () => {
+    const fromNormalize = { kind: 'user' as const, id: 'u-norm' };
+    const interceptor = createParticipantResolverInterceptor(); // no config
+
+    const { downstream, get } = captureDownstream();
+    const agent = createMockAgent('test-agent');
+    // Channel has no resolveParticipant hook
+    const chain = composeChain([interceptor, downstream], agent, createMockChannel(), createMockRegistry());
+    await executeChain(chain, {
+      message: 'hi',
+      conversationId: 'c1',
+      participant: fromNormalize,
+    });
+
+    expect(get()?.participant).toEqual(fromNormalize);
+    expect(get()?.context?._participant).toEqual(fromNormalize);
+  });
+
+  it('channel-resolved participant overrides normalize-provided participant', async () => {
+    const fromNormalize = { kind: 'user' as const, id: 'u-norm' };
+    const fromChannel = { kind: 'user' as const, id: 'u-norm', displayName: 'Resolved Name' };
+
+    const channel = createMockChannel();
+    channel.resolveParticipant = vi.fn().mockResolvedValue(fromChannel);
+
+    const interceptor = createParticipantResolverInterceptor();
+
+    const { downstream, get } = captureDownstream();
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor, downstream], agent, channel, createMockRegistry());
+    await executeChain(chain, {
+      message: 'hi',
+      conversationId: 'c1',
+      participant: fromNormalize,
+    });
+
+    expect(get()?.participant).toEqual(fromChannel);
+  });
+
+  it('falls back to normalize-provided participant when channel resolver throws', async () => {
+    const fromNormalize = { kind: 'user' as const, id: 'u-norm' };
+    const channel = createMockChannel();
+    channel.resolveParticipant = vi.fn().mockRejectedValue(new Error('api down'));
+
+    const interceptor = createParticipantResolverInterceptor();
+
+    const { downstream, get } = captureDownstream();
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor, downstream], agent, channel, createMockRegistry());
+    await executeChain(chain, {
+      message: 'hi',
+      conversationId: 'c1',
+      participant: fromNormalize,
+    });
+
+    expect(get()?.participant).toEqual(fromNormalize);
+  });
+
+  it('passes through unchanged when nothing is available', async () => {
+    const interceptor = createParticipantResolverInterceptor({
+      resolveParticipant: () => undefined,
+    });
+
+    const { downstream, get } = captureDownstream();
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([interceptor, downstream], agent, createMockChannel(), createMockRegistry());
+    await executeChain(chain, { message: 'hi', conversationId: 'c1' });
+
+    expect(get()?.participant).toBeUndefined();
+    expect(get()?.context?._participant).toBeUndefined();
+  });
+});
+
+// ---------- address-check ----------
+
+describe('isAgentNameOnlyInCodeBlocks', () => {
+  it('returns false when name is not in message at all', () => {
+    expect(isAgentNameOnlyInCodeBlocks('hello world', 'kael')).toBe(false);
+  });
+
+  it('returns false when there are no code regions', () => {
+    expect(isAgentNameOnlyInCodeBlocks('hey kael, how are you?', 'kael')).toBe(false);
+  });
+
+  it('returns true when name is only inside a fenced block', () => {
+    expect(isAgentNameOnlyInCodeBlocks('check this: ```error in kael system```', 'kael')).toBe(true);
+  });
+
+  it('returns false when name appears both inside and outside code', () => {
+    expect(
+      isAgentNameOnlyInCodeBlocks('hey kael, here is the issue: ```kael crashed```', 'kael')
+    ).toBe(false);
+  });
+
+  it('returns true with multiple fenced blocks, name only inside', () => {
+    const message = 'look: ```kael log 1``` also ```kael log 2``` please';
+    expect(isAgentNameOnlyInCodeBlocks(message, 'kael')).toBe(true);
+  });
+
+  it('handles duplicate identical fenced blocks correctly', () => {
+    const message = '```kael``` and again ```kael```';
+    expect(isAgentNameOnlyInCodeBlocks(message, 'kael')).toBe(true);
+  });
+
+  it('treats inline backticks as code', () => {
+    expect(isAgentNameOnlyInCodeBlocks('check `kael` output', 'kael')).toBe(true);
+  });
+
+  it('returns false when inline code contains name but name also outside', () => {
+    expect(isAgentNameOnlyInCodeBlocks('hey kael, see `kael` in logs', 'kael')).toBe(false);
+  });
+
+  it('is case-insensitive', () => {
+    expect(isAgentNameOnlyInCodeBlocks('```KAEL output```', 'kael')).toBe(true);
+  });
+});
+
+describe('createAddressCheckInterceptor', () => {
+  const baseConfig = {
+    agentName: 'kael',
+    agentId: 'U123',
+    getMessageText: (input: AgentInput) => input.message,
+  };
+
+  async function classify(input: AgentInput, extraConfig: Partial<typeof baseConfig> = {}) {
+    let captured: AddressCheckResult | undefined;
+    const interceptor = createAddressCheckInterceptor({
+      ...baseConfig,
+      ...extraConfig,
+      onClassified: (result) => {
+        captured = result;
+      },
+    });
+    await runInterceptor(interceptor, input);
+    return captured;
+  }
+
+  it('classifies DM as direct', async () => {
+    const result = await classify(
+      { message: 'hello', conversationId: 'c1' },
+      { isDirectMessage: () => true } as Partial<typeof baseConfig> & { isDirectMessage: (i: AgentInput) => boolean }
+    );
+    expect(result).toBe('direct');
+  });
+
+  it('classifies vocative (greeting start) as direct', async () => {
+    expect(await classify({ message: 'hey kael, help me', conversationId: 'c1' })).toBe('direct');
+    expect(await classify({ message: '@kael fix this', conversationId: 'c1' })).toBe('direct');
+    expect(await classify({ message: 'kael, do it', conversationId: 'c1' })).toBe('direct');
+  });
+
+  it('classifies possessive patterns as ambiguous (not direct)', async () => {
+    expect(await classify({ message: 'the kael mentioned earlier', conversationId: 'c1' })).toBe('ambiguous');
+    expect(await classify({ message: 'our kael logged that', conversationId: 'c1' })).toBe('ambiguous');
+    expect(await classify({ message: 'my kael is broken', conversationId: 'c1' })).toBe('ambiguous');
+  });
+
+  it('classifies agent name only inside code block as ignore', async () => {
+    expect(
+      await classify({ message: 'see this: ```error in kael system```', conversationId: 'c1' })
+    ).toBe('ignore');
+  });
+
+  it('does NOT classify as ignore when name is addressed outside code', async () => {
+    // "hey kael" at the start is vocative → direct, regardless of code block below
+    expect(
+      await classify({ message: 'hey kael, here is: ```stack trace```', conversationId: 'c1' })
+    ).toBe('direct');
+  });
+
+  it('classifies URL-only messages as ignore', async () => {
+    expect(await classify({ message: 'https://example.com/doc', conversationId: 'c1' })).toBe('ignore');
+  });
+
+  it('classifies simple name mention as ambiguous', async () => {
+    expect(await classify({ message: 'I was thinking about kael yesterday', conversationId: 'c1' })).toBe('ambiguous');
+  });
+
+  it('classifies no-mention as passive', async () => {
+    expect(await classify({ message: 'just some chatter here', conversationId: 'c1' })).toBe('passive');
+  });
+
+  it('classifies co-mentions as indirect', async () => {
+    // Message must not start with agent name (would match vocative rule as 'direct').
+    const result = await classify(
+      { message: 'please loop in kael and bob on this', conversationId: 'c1' },
+      { getMentions: () => ['kael', 'bob'] } as Partial<typeof baseConfig> & { getMentions: (i: AgentInput) => string[] }
+    );
+    expect(result).toBe('indirect');
+  });
+
+  it('enriches input context with _addressCheck', async () => {
+    const interceptor = createAddressCheckInterceptor(baseConfig);
+
+    let capturedInput: AgentInput | undefined;
+    const downstream: Interceptor = async (input, _ctx, next) => {
+      capturedInput = input;
+      return await next();
+    };
+
+    const agent = createMockAgent('kael');
+    const chain = composeChain([interceptor, downstream], agent, createMockChannel(), createMockRegistry());
+    await executeChain(chain, { message: 'hey kael', conversationId: 'c1' });
+
+    expect(capturedInput?.context?._addressCheck).toBe('direct');
+  });
+});
+
+// ---------- depth-guard ----------
+
+describe('createDepthGuardInterceptor', () => {
+  it('allows invocations at or below maxDepth', async () => {
+    const interceptor = createDepthGuardInterceptor({ maxDepth: 5 });
+    const { result, agent } = await runInterceptor(interceptor, {
+      message: 'hi',
+      conversationId: 'c1',
+    });
+    expect(result).not.toBeNull();
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+  });
+
+  it('DepthExceededError carries current and max depth', () => {
+    const err = new DepthExceededError(7, 5);
+    expect(err.currentDepth).toBe(7);
+    expect(err.maxDepth).toBe(5);
+    expect(err.name).toBe('DepthExceededError');
+    expect(err.message).toContain('7');
+    expect(err.message).toContain('5');
+  });
+});
+
+// ---------- tracer ----------
+
+describe('createTracerInterceptor', () => {
+  it('forwards input to next and preserves result', async () => {
+    const interceptor = createTracerInterceptor();
+    const { result, agent } = await runInterceptor(interceptor, {
+      message: 'hi',
+      conversationId: 'c1',
+    });
+    expect(result).not.toBeNull();
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+  });
+
+  it('propagates skip sentinel from downstream', async () => {
+    const tracer = createTracerInterceptor();
+    const skipper: Interceptor = async (_input, ctx, _next) => ctx.skip();
+
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([tracer, skipper], agent, createMockChannel(), createMockRegistry());
+    const result = await executeChain(chain, { message: 'hi', conversationId: 'c1' });
+
+    expect(result).toBeNull();
+    expect(agent.invokeAgent).not.toHaveBeenCalled();
+  });
+
+  it('re-throws errors from downstream after logging', async () => {
+    const tracer = createTracerInterceptor();
+    const thrower: Interceptor = async () => {
+      throw new Error('boom');
+    };
+
+    const agent = createMockAgent('test-agent');
+    const chain = composeChain([tracer, thrower], agent, createMockChannel(), createMockRegistry());
+
+    await expect(
+      executeChain(chain, { message: 'hi', conversationId: 'c1' })
+    ).rejects.toThrow('boom');
+  });
+
+  it('skips tracing when shouldTrace returns false', async () => {
+    const shouldTrace = vi.fn(() => false);
+    const tracer = createTracerInterceptor({ shouldTrace });
+    const { result, agent } = await runInterceptor(tracer, {
+      message: 'hi',
+      conversationId: 'c1',
+    });
+    expect(shouldTrace).toHaveBeenCalled();
+    expect(result).not.toBeNull();
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+  });
+});
+
+// ---------- intent-classifier ----------
+
+describe('createIntentClassifierInterceptor', () => {
+  const baseConfig = {
+    agentName: 'kael',
+    agentId: 'U123',
+    getMessageText: (input: AgentInput) => input.message,
+    getSenderName: () => 'alice',
+    getChannelName: () => 'general',
+  };
+
+  /** Build a chain with the classifier interceptor and a registry containing a mock classifier agent. */
+  function setup(
+    classifierResult: AgentResult,
+    configOverrides: Partial<Parameters<typeof createIntentClassifierInterceptor>[0]> = {},
+    classifierName = 'intent-classifier'
+  ) {
+    const classifierAgent = createMockAgent(classifierName, classifierResult);
+    const agents = new Map<string, AgentInstance>([[classifierName, classifierAgent]]);
+
+    const interceptor = createIntentClassifierInterceptor({ ...baseConfig, ...configOverrides });
+    const agent = createMockAgent('kael');
+    const channel = createMockChannel();
+    const registry = createMockRegistry(agents);
+    const chain = composeChain([interceptor], agent, channel, registry);
+
+    return { chain, agent, classifierAgent, registry };
+  }
+
+  it('short-circuits when address-check is direct (no LLM call)', async () => {
+    const { chain, agent, classifierAgent } = setup({ output: 'direct' });
+    const result = await executeChain(chain, {
+      message: 'hello',
+      conversationId: 'c1',
+      context: { _addressCheck: 'direct' },
+    });
+
+    expect(result).not.toBeNull();
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+    expect(classifierAgent.invokeAgent).not.toHaveBeenCalled();
+  });
+
+  it('short-circuits with skip when address-check is passive (no LLM call)', async () => {
+    const onClassified = vi.fn();
+    const { chain, agent, classifierAgent } = setup({ output: 'direct' }, { onClassified });
+    const result = await executeChain(chain, {
+      message: 'just chatter',
+      conversationId: 'c1',
+      context: { _addressCheck: 'passive' },
+    });
+
+    expect(result).toBeNull();
+    expect(agent.invokeAgent).not.toHaveBeenCalled();
+    expect(classifierAgent.invokeAgent).not.toHaveBeenCalled();
+    expect(onClassified).toHaveBeenCalledWith('passive', expect.anything());
+  });
+
+  it('short-circuits with skip when address-check is ignore (no LLM call)', async () => {
+    const onClassified = vi.fn();
+    const { chain, agent, classifierAgent } = setup({ output: 'direct' }, { onClassified });
+    const result = await executeChain(chain, {
+      message: 'https://example.com',
+      conversationId: 'c1',
+      context: { _addressCheck: 'ignore' },
+    });
+
+    expect(result).toBeNull();
+    expect(agent.invokeAgent).not.toHaveBeenCalled();
+    expect(classifierAgent.invokeAgent).not.toHaveBeenCalled();
+    expect(onClassified).toHaveBeenCalledWith('ignore', expect.anything());
+  });
+
+  it('delegates to classifier and continues when classification=direct', async () => {
+    const onClassified = vi.fn();
+    const { chain, agent, classifierAgent } = setup({ output: 'direct' }, { onClassified });
+    const result = await executeChain(chain, {
+      message: 'the kael issue',
+      conversationId: 'c1',
+      context: { _addressCheck: 'ambiguous' },
+    });
+
+    expect(classifierAgent.invokeAgent).toHaveBeenCalledTimes(1);
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+    expect(result).not.toBeNull();
+    expect(onClassified).toHaveBeenCalledWith('direct', expect.anything());
+  });
+
+  it('delegates to classifier and skips when classification=passive', async () => {
+    const { chain, agent, classifierAgent } = setup({ output: 'passive' });
+    const result = await executeChain(chain, {
+      message: 'the kael issue',
+      conversationId: 'c1',
+      context: { _addressCheck: 'ambiguous' },
+    });
+
+    expect(classifierAgent.invokeAgent).toHaveBeenCalledTimes(1);
+    expect(agent.invokeAgent).not.toHaveBeenCalled();
+    expect(result).toBeNull();
+  });
+
+  it('delegates to classifier and skips when classification=ignore', async () => {
+    const { chain, agent } = setup({ output: 'ignore' });
+    const result = await executeChain(chain, {
+      message: 'the kael issue',
+      conversationId: 'c1',
+      context: { _addressCheck: 'indirect' },
+    });
+    expect(agent.invokeAgent).not.toHaveBeenCalled();
+    expect(result).toBeNull();
+  });
+
+  it('delegates to classifier and skips when classification=indirect', async () => {
+    const { chain, agent } = setup({ output: 'indirect' });
+    const result = await executeChain(chain, {
+      message: 'the kael issue',
+      conversationId: 'c1',
+      context: { _addressCheck: 'ambiguous' },
+    });
+    expect(agent.invokeAgent).not.toHaveBeenCalled();
+    expect(result).toBeNull();
+  });
+
+  it('enriches input with _intentClassification before calling agent', async () => {
+    const classifierAgent = createMockAgent('intent-classifier', { output: 'direct' });
+    const agents = new Map<string, AgentInstance>([['intent-classifier', classifierAgent]]);
+
+    const interceptor = createIntentClassifierInterceptor(baseConfig);
+    const agent = createMockAgent('kael');
+    const registry = createMockRegistry(agents);
+    const chain = composeChain([interceptor], agent, createMockChannel(), registry);
+
+    await executeChain(chain, {
+      message: 'the kael issue',
+      conversationId: 'c1',
+      context: { _addressCheck: 'ambiguous' },
+    });
+
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+    const forwarded = (agent.invokeAgent as ReturnType<typeof vi.fn>).mock.calls[0][0] as AgentInput;
+    expect(forwarded.context?._intentClassification).toBe('direct');
+    // Original address-check context is preserved too
+    expect(forwarded.context?._addressCheck).toBe('ambiguous');
+  });
+
+  it('falls back to allowing the message when classifier throws', async () => {
+    const brokenClassifier = createMockAgent('intent-classifier');
+    (brokenClassifier.invokeAgent as ReturnType<typeof vi.fn>).mockRejectedValue(new Error('llm down'));
+    const agents = new Map<string, AgentInstance>([['intent-classifier', brokenClassifier]]);
+
+    const interceptor = createIntentClassifierInterceptor(baseConfig);
+    const agent = createMockAgent('kael');
+    const registry = createMockRegistry(agents);
+    const chain = composeChain([interceptor], agent, createMockChannel(), registry);
+
+    const result = await executeChain(chain, {
+      message: 'the kael issue',
+      conversationId: 'c1',
+      context: { _addressCheck: 'ambiguous' },
+    });
+
+    expect(brokenClassifier.invokeAgent).toHaveBeenCalledTimes(1);
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+    expect(result).not.toBeNull();
+  });
+
+  it('skips empty-message classification and passes through', async () => {
+    const { chain, agent, classifierAgent } = setup({ output: 'direct' });
+    const result = await executeChain(chain, {
+      message: '   ',
+      conversationId: 'c1',
+      context: { _addressCheck: 'ambiguous' },
+    });
+    // Empty text path does NOT delegate, just calls next
+    expect(classifierAgent.invokeAgent).not.toHaveBeenCalled();
+    expect(agent.invokeAgent).toHaveBeenCalledTimes(1);
+    expect(result).not.toBeNull();
+  });
+
+  it('uses custom classifierAgentName when provided', async () => {
+    const custom = createMockAgent('my-classifier', { output: 'direct' });
+    const agents = new Map<string, AgentInstance>([['my-classifier', custom]]);
+
+    const interceptor = createIntentClassifierInterceptor({
+      ...baseConfig,
+      classifierAgentName: 'my-classifier',
+    });
+    const agent = createMockAgent('kael');
+    const registry = createMockRegistry(agents);
+    const chain = composeChain([interceptor], agent, createMockChannel(), registry);
+
+    await executeChain(chain, {
+      message: 'the kael issue',
+      conversationId: 'c1',
+      context: { _addressCheck: 'ambiguous' },
+    });
+
+    expect(custom.invokeAgent).toHaveBeenCalledTimes(1);
+  });
+
+  it('passes message text, agent identity and sender/channel context to classifier', async () => {
+    const classifierAgent = createMockAgent('intent-classifier', { output: 'direct' });
+    const agents = new Map<string, AgentInstance>([['intent-classifier', classifierAgent]]);
+
+    const interceptor = createIntentClassifierInterceptor({
+      ...baseConfig,
+      isDirectMessage: () => false,
+    });
+    const agent = createMockAgent('kael');
+    const registry = createMockRegistry(agents);
+    const chain = composeChain([interceptor], agent, createMockChannel(), registry);
+
+    await executeChain(chain, {
+      message: 'hello kael team',
+      conversationId: 'conv-xyz',
+      context: { _addressCheck: 'ambiguous' },
+    });
+
+    const delegated = (classifierAgent.invokeAgent as ReturnType<typeof vi.fn>).mock.calls[0][0] as AgentInput;
+    expect(delegated.conversationId).toBe('conv-xyz');
+    expect(delegated.data).toMatchObject({
+      message: 'hello kael team',
+      agentName: 'kael',
+      agentId: 'U123',
+      senderName: 'alice',
+      channelName: 'general',
+      isDirectMessage: false,
+    });
+  });
+});
+
+// ---------- regex-escape regression for address-check ----------
+
+describe('createAddressCheckInterceptor - regex escaping', () => {
+  async function classify(agentName: string, message: string) {
+    let captured: AddressCheckResult | undefined;
+    const interceptor = createAddressCheckInterceptor({
+      agentName,
+      agentId: 'U123',
+      getMessageText: (input) => input.message,
+      onClassified: (r) => {
+        captured = r;
+      },
+    });
+    await runInterceptor(interceptor, { message, conversationId: 'c1' });
+    return captured;
+  }
+
+  it('handles agent name with dot ("agent.v2") without throwing', async () => {
+    expect(await classify('agent.v2', 'hey agent.v2, help')).toBe('direct');
+    // Dot should not match arbitrary char: "agentXv2" must not classify as direct
+    expect(await classify('agent.v2', 'hey agentXv2 how are you')).not.toBe('direct');
+  });
+
+  it('does not treat "+" as regex quantifier for name "c++"', async () => {
+    // Without escaping, "c++" would be a regex meaning one+ 'c's. With escaping,
+    // the literal "ccc" must NOT match the literal name "c++".
+    expect(await classify('c++', 'hey ccc please')).not.toBe('direct');
+  });
+
+  it('does not throw when agent name contains parentheses ("bot(dev)")', async () => {
+    // Unescaped, "bot(dev)" creates an invalid/misinterpreted capture group.
+    // We only assert construction + execution doesn't crash here.
+    await expect(classify('bot(dev)', 'unrelated message')).resolves.toBeDefined();
+    await expect(classify('bot(dev)', 'the bot(dev) said hello')).resolves.toBeDefined();
+  });
+
+  it('handles possessive pattern with special chars in name', async () => {
+    expect(await classify('agent.v2', 'the agent.v2 logged an issue')).toBe('ambiguous');
+  });
+
+  it('does not throw when agentId contains regex metacharacters', async () => {
+    const interceptor = createAddressCheckInterceptor({
+      agentName: 'kael',
+      agentId: 'U+special.id',
+      getMessageText: (input) => input.message,
+    });
+    // Should not throw during RegExp construction
+    const { result } = await runInterceptor(interceptor, {
+      message: '@U+special.id help',
+      conversationId: 'c1',
+    });
+    expect(result).not.toBeNull();
+  });
+});
+
+// ---------- sanity: SKIP_SENTINEL helpers cross-check ----------
+
+describe('skip sentinel integration', () => {
+  it('isSkipSentinel identifies the skip symbol', () => {
+    expect(isSkipSentinel(SKIP_SENTINEL)).toBe(true);
+    expect(isSkipSentinel({ output: 'x' })).toBe(false);
+  });
+});
diff --git a/packages/toolpack-agents/src/interceptors/builtins/capture-history.test.ts b/packages/toolpack-agents/src/interceptors/builtins/capture-history.test.ts
new file mode 100644
index 0000000..073d229
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/capture-history.test.ts
@@ -0,0 +1,406 @@
+import { describe, it, expect, vi } from 'vitest';
+import { createCaptureInterceptor } from './capture-history.js';
+import { InMemoryConversationStore } from '../../history/store.js';
+import { composeChain, executeChain } from '../chain.js';
+import { skip } from '../types.js';
+import type { Interceptor } from '../types.js';
+
+// ---------------------------------------------------------------------------
+// Shared test helpers (inline to avoid cross-file deps)
+// ---------------------------------------------------------------------------
+
+function createMockAgent(name = 'kael') {
+  return { name, description: 'test agent', mode: 'chat' } as any;
+}
+
+function createMockChannel() {
+  return { isTriggerChannel: false, name: 'test', send: vi.fn(), listen: vi.fn(), onMessage: vi.fn(), normalize: vi.fn() } as any;
+}
+
+function createMockRegistry() {
+  return {} as any;
+}
+
+/** Terminal agent invoker (replaces the real agent in tests). */
+function makeTerminal(output = 'agent reply'): Interceptor {
+  return async (_input, _ctx, _next) => ({ output, metadata: {} });
+}
+
+// ---------------------------------------------------------------------------
+// Tests
+// ---------------------------------------------------------------------------
+
+describe('createCaptureInterceptor', () => {
+  it('writes the inbound message to the store before calling downstream', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hello',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1', displayName: 'Alice' },
+    });
+
+    const stored = await store.get('conv-1');
+    const userMsg = stored.find(m => m.participant.kind === 'user');
+    expect(userMsg).toBeDefined();
+    expect(userMsg?.content).toBe('hello');
+    expect(userMsg?.participant.id).toBe('u1');
+  });
+
+  it('writes the agent reply to the store after the chain resolves', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal('agent reply text')],
+      createMockAgent('kael'),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hello',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1', displayName: 'Alice' },
+    });
+
+    const stored = await store.get('conv-1');
+    // Should have user message + agent reply
+    expect(stored).toHaveLength(2);
+    const agentMsg = stored.find(m => m.participant.kind === 'agent');
+    expect(agentMsg?.content).toBe('agent reply text');
+    expect(agentMsg?.participant.id).toBe('kael');
+  });
+
+  it('does NOT write an agent reply when the chain returns a skip sentinel', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    // Downstream skips (e.g. address-check decided to ignore)
+    const skipInterceptor: Interceptor = async (_input, _ctx, _next) => skip();
+
+    const chain = composeChain(
+      [interceptor, skipInterceptor],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'Alice and Bob discussing lunch',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1' },
+    });
+
+    const stored = await store.get('conv-1');
+    // Inbound message captured, but no agent reply
+    expect(stored).toHaveLength(1);
+    expect(stored[0].participant.kind).toBe('user');
+  });
+
+  it('skips capture (but does not crash) when input has no conversationId', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    // No conversationId — the interceptor should still call next()
+    const result = await executeChain(chain, {
+      message: 'orphan message',
+      participant: { kind: 'user', id: 'u1' },
+    });
+
+    // Chain completed (result is not null)
+    expect(result).not.toBeNull();
+    // Nothing written to any conversation
+    expect(await store.get('conv-1')).toHaveLength(0);
+  });
+
+  it('skips capture when input has no participant', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'anonymous message',
+      conversationId: 'conv-1',
+      // No participant
+    });
+
+    // With no participant we cannot attribute the message, so nothing written
+    const stored = await store.get('conv-1');
+    const userMessages = stored.filter(m => m.participant.kind !== 'agent');
+    expect(userMessages).toHaveLength(0);
+  });
+
+  it('calls onCaptured after each successful write', async () => {
+    const store = new InMemoryConversationStore();
+    const onCaptured = vi.fn();
+    const interceptor = createCaptureInterceptor({ store, onCaptured });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal('reply')],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hello',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1' },
+    });
+
+    // Called once for inbound, once for agent reply
+    expect(onCaptured).toHaveBeenCalledTimes(2);
+  });
+
+  it('captureAgentReplies: false suppresses the agent reply write', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store, captureAgentReplies: false });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal('reply')],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hello',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1' },
+    });
+
+    const stored = await store.get('conv-1');
+    expect(stored).toHaveLength(1);
+    expect(stored[0].participant.kind).toBe('user');
+  });
+
+  it('infers scope as "dm" from channelType "im"', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hey',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1' },
+      context: { channelType: 'im' },
+    });
+
+    const stored = await store.get('conv-1');
+    expect(stored[0].scope).toBe('dm');
+  });
+
+  it('infers scope as "dm" from channelType "private" (Telegram DM)', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hey',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1' },
+      context: { channelType: 'private' },
+    });
+
+    const stored = await store.get('conv-1');
+    expect(stored[0].scope).toBe('dm');
+  });
+
+  it('infers scope as "dm" from channelType "dm" (Discord DM)', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hey',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1' },
+      context: { channelType: 'dm' },
+    });
+
+    const stored = await store.get('conv-1');
+    expect(stored[0].scope).toBe('dm');
+  });
+
+  it('infers scope as "channel" by default', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hey',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1' },
+    });
+
+    const stored = await store.get('conv-1');
+    expect(stored[0].scope).toBe('channel');
+  });
+
+  it('infers scope as "thread" when context.threadId is present', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'threaded reply',
+      conversationId: 'thread-root-ts',
+      participant: { kind: 'user', id: 'u1' },
+      context: { threadId: 'thread-root-ts' },
+    });
+
+    const stored = await store.get('thread-root-ts');
+    expect(stored[0].scope).toBe('thread');
+  });
+
+  it('uses a custom getMessageId when provided', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({
+      store,
+      getMessageId: () => 'fixed-id',
+    });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hello',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1' },
+    });
+
+    const stored = await store.get('conv-1');
+    expect(stored[0].id).toBe('fixed-id');
+  });
+
+  it('writes channelName and channelId into stored message metadata', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hello',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1' },
+      context: { channelName: '#general', channelId: 'C123' },
+    });
+
+    const stored = await store.get('conv-1');
+    expect(stored[0].metadata?.channelName).toBe('#general');
+    expect(stored[0].metadata?.channelId).toBe('C123');
+    // agent reply also inherits channel metadata
+    expect(stored[1].metadata?.channelName).toBe('#general');
+    expect(stored[1].metadata?.channelId).toBe('C123');
+  });
+
+  it('captures agent reply with empty string output', async () => {
+    const store = new InMemoryConversationStore();
+    const interceptor = createCaptureInterceptor({ store });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal('')],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    await executeChain(chain, {
+      message: 'hello',
+      conversationId: 'conv-1',
+      participant: { kind: 'user', id: 'u1' },
+    });
+
+    const stored = await store.get('conv-1');
+    // Both inbound and reply should be stored
+    expect(stored).toHaveLength(2);
+    expect(stored[1].content).toBe('');
+    expect(stored[1].participant.kind).toBe('agent');
+  });
+
+  it('does not crash when the store throws on append', async () => {
+    const brokenStore = {
+      append: vi.fn().mockRejectedValue(new Error('DB error')),
+      get: vi.fn().mockResolvedValue([]),
+      search: vi.fn().mockResolvedValue([]),
+    };
+    const interceptor = createCaptureInterceptor({ store: brokenStore });
+
+    const chain = composeChain(
+      [interceptor, makeTerminal()],
+      createMockAgent(),
+      createMockChannel(),
+      createMockRegistry()
+    );
+
+    // Should not throw even if the store is broken
+    await expect(
+      executeChain(chain, {
+        message: 'hello',
+        conversationId: 'conv-1',
+        participant: { kind: 'user', id: 'u1' },
+      })
+    ).resolves.not.toThrow();
+  });
+});
diff --git a/packages/toolpack-agents/src/interceptors/builtins/capture-history.ts b/packages/toolpack-agents/src/interceptors/builtins/capture-history.ts
new file mode 100644
index 0000000..29a7608
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/capture-history.ts
@@ -0,0 +1,223 @@
+import { randomUUID } from 'crypto';
+import type { AgentInput } from '../../agent/types.js';
+import type { Interceptor, InterceptorContext, InterceptorResult, NextFunction } from '../types.js';
+import { isSkipSentinel } from '../types.js';
+import type { ConversationStore, ConversationScope, StoredMessage } from '../../history/types.js';
+
+/**
+ * Configuration for the capture-history interceptor.
+ */
+export interface CaptureHistoryConfig {
+  /**
+   * The conversation store to write messages into.
+   * Typically `new InMemoryConversationStore()` for single-process deployments,
+   * or a database-backed adapter for production.
+   */
+  store: ConversationStore;
+
+  /**
+   * Derive the scope of an incoming message.
+   * Default: reads `input.context?.channelType` — `'im'` → `'dm'`,
+   * presence of `context?.threadId` → `'thread'`, otherwise `'channel'`.
+   */
+  getScope?: (input: AgentInput) => ConversationScope;
+
+  /**
+   * Derive a stable message id for dedup.
+   * Default: `input.context?.messageId ?? input.context?.eventId ?? randomUUID()`.
+   * Supply this if your channel puts the platform message id somewhere else.
+   */
+  getMessageId?: (input: AgentInput) => string;
+
+  /**
+   * Derive explicit @-mention ids from the message for addressed-only filtering.
+   * Default: `(input.context?.mentions as string[] | undefined) ?? []`.
+   */
+  getMentions?: (input: AgentInput) => string[];
+
+  /**
+   * Called after a message is successfully written to the store.
+   * Useful for metrics or debug logging.
+   */
+  onCaptured?: (message: StoredMessage) => void;
+
+  /**
+   * When true, the interceptor also writes the agent's reply to the store
+   * as a `kind: 'agent'` turn after `next()` returns.
+   * Default: true.
+   */
+  captureAgentReplies?: boolean;
+}
+
+/**
+ * Resolve the scope of an incoming message from its context.
+ */
+function defaultGetScope(input: AgentInput): ConversationScope {
+  const ctx = input.context ?? {};
+
+  // Platform DM signals:
+  //   Slack:    channelType === 'im'
+  //   Telegram: channelType === 'private'
+  //   Discord:  channelType === 'dm'
+  const channelType = ctx.channelType as string | undefined;
+  if (channelType === 'im' || channelType === 'private' || channelType === 'dm') {
+    return 'dm';
+  }
+
+  // If there is a threadId in context, treat this as a thread-scoped message.
+  // Channel adapters (e.g. SlackChannel.normalize) are responsible for only
+  // setting threadId when it is distinct from the conversationId, so no
+  // additional equality check is needed here.
+  if (ctx.threadId !== undefined) {
+    return 'thread';
+  }
+
+  return 'channel';
+}
+
+/**
+ * Creates a capture-history interceptor.
+ *
+ * **Purpose:** The capture stage runs for *every* allowed inbound message,
+ * regardless of whether the agent ends up replying. It writes the message to
+ * the `ConversationStore` so it is available as future context for the assembler.
+ *
+ * The interceptor wraps `next()`:
+ * 1. Before calling downstream: write the inbound user message.
+ * 2. After `next()` resolves (and the result is not a skip sentinel): write the
+ *    agent's reply as a `kind: 'agent'` turn. This keeps the reply in the log
+ *    automatically without any changes to agent code.
+ *
+ * **Placement:** Put this interceptor *after* `createParticipantResolverInterceptor`
+ * (so `input.participant` is already enriched) and *before*
+ * `createAddressCheckInterceptor` (so even ignored messages are captured).
+ *
+ * @example
+ * ```ts
+ * const store = new InMemoryConversationStore();
+ *
+ * interceptors: [
+ *   createParticipantResolverInterceptor(),
+ *   createCaptureInterceptor({ store }),   // ← before address-check
+ *   createAddressCheckInterceptor({ agentName: 'kael', ... }),
+ *   createIntentClassifierInterceptor({ ... }),
+ * ]
+ * ```
+ */
+/**
+ * Symbol stamped onto every interceptor function returned by `createCaptureInterceptor`.
+ * Used by `BaseAgent._bindChannel` to detect whether a capture interceptor has already
+ * been wired — preventing the auto-inserted one from duplicating an explicit one.
+ */
+export const CAPTURE_INTERCEPTOR_MARKER = Symbol.for('toolpack:capture-history');
+
+export function createCaptureInterceptor(config: CaptureHistoryConfig): Interceptor {
+  // Resolve config options once at factory time — not per invocation.
+  const captureAgentReplies = config.captureAgentReplies ?? true;
+  const getScope = config.getScope ?? defaultGetScope;
+  const getMessageId = config.getMessageId ?? ((inp: AgentInput) =>
+    (inp.context?.messageId as string | undefined) ??
+    (inp.context?.eventId as string | undefined) ??
+    randomUUID()
+  );
+  const getMentions = config.getMentions ?? ((inp: AgentInput) =>
+    (inp.context?.mentions as string[] | undefined) ?? []
+  );
+
+  const interceptorFn = async (input: AgentInput, ctx: InterceptorContext, next: NextFunction): Promise<InterceptorResult> => {
+    // --- Capture the inbound message ---
+
+    const conversationId = input.conversationId;
+
+    if (!conversationId) {
+      // No conversationId means we cannot key the message; skip capture
+      // but still let the chain continue.
+      ctx.logger?.warn('[capture-history] Message has no conversationId — skipping capture');
+      return await next();
+    }
+
+    const participant = input.participant;
+
+    if (participant) {
+      const inboundMessage: StoredMessage = {
+        id: getMessageId(input),
+        conversationId,
+        participant,
+        content: input.message ?? '',
+        timestamp: new Date().toISOString(),
+        scope: getScope(input),
+        metadata: {
+          channelType: input.context?.channelType as string | undefined,
+          threadId: input.context?.threadId as string | undefined,
+          messageId: input.context?.messageId as string | undefined,
+          mentions: getMentions(input),
+          channelName: input.context?.channelName as string | undefined,
+          channelId: input.context?.channelId as string | undefined,
+        },
+      };
+
+      try {
+        await config.store.append(inboundMessage);
+        config.onCaptured?.(inboundMessage);
+        ctx.logger?.debug('[capture-history] Captured inbound message', {
+          messageId: inboundMessage.id,
+          participantId: participant.id,
+          conversationId,
+        });
+      } catch (error) {
+        // Storage errors must never crash the pipeline.
+        ctx.logger?.warn('[capture-history] Failed to store inbound message', {
+          error: error instanceof Error ? error.message : String(error),
+        });
+      }
+    }
+
+    // --- Call downstream (trigger, address-check, agent, etc.) ---
+
+    const result = await next();
+
+    // --- Capture the agent's reply (if it produced one) ---
+
+    if (captureAgentReplies && !isSkipSentinel(result) && result.output != null) {
+      const agentParticipant = {
+        kind: 'agent' as const,
+        id: ctx.agent.name,
+        displayName: ctx.agent.name,
+      };
+
+      const replyMessage: StoredMessage = {
+        id: randomUUID(),
+        conversationId,
+        participant: agentParticipant,
+        content: result.output,
+        timestamp: new Date().toISOString(),
+        scope: getScope(input),
+        metadata: {
+          channelType: input.context?.channelType as string | undefined,
+          threadId: input.context?.threadId as string | undefined,
+          channelName: input.context?.channelName as string | undefined,
+          channelId: input.context?.channelId as string | undefined,
+        },
+      };
+
+      try {
+        await config.store.append(replyMessage);
+        config.onCaptured?.(replyMessage);
+        ctx.logger?.debug('[capture-history] Captured agent reply', {
+          messageId: replyMessage.id,
+          agentId: ctx.agent.name,
+          conversationId,
+        });
+      } catch (error) {
+        ctx.logger?.warn('[capture-history] Failed to store agent reply', {
+          error: error instanceof Error ? error.message : String(error),
+        });
+      }
+    }
+
+    return result;
+  };
+
+  (interceptorFn as unknown as Record<symbol, unknown>)[CAPTURE_INTERCEPTOR_MARKER] = true;
+  return interceptorFn;
+}
diff --git a/packages/toolpack-agents/src/interceptors/builtins/depth-guard.ts b/packages/toolpack-agents/src/interceptors/builtins/depth-guard.ts
new file mode 100644
index 0000000..e80dcd9
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/depth-guard.ts
@@ -0,0 +1,73 @@
+import type { AgentInput } from '../../agent/types.js';
+import type { Interceptor, InterceptorContext, InterceptorResult, NextFunction } from '../types.js';
+
+/**
+ * Configuration for the depth guard interceptor.
+ */
+export interface DepthGuardConfig {
+  /** Maximum allowed invocation depth (default: 5) */
+  maxDepth?: number;
+
+  /** Optional callback when depth limit is exceeded */
+  onDepthExceeded?: (currentDepth: number, maxDepth: number, input: AgentInput) => void;
+}
+
+/**
+ * Error thrown when invocation depth exceeds the configured maximum.
+ */
+export class DepthExceededError extends Error {
+  constructor(
+    public readonly currentDepth: number,
+    public readonly maxDepth: number
+  ) {
+    super(`Maximum invocation depth exceeded: ${currentDepth} > ${maxDepth}`);
+    this.name = 'DepthExceededError';
+  }
+}
+
+/**
+ * Creates a depth guard interceptor.
+ *
+ * Enforces maximum invocation depth on delegate chains.
+ * This provides an early check before the actual delegation happens,
+ * complementing the depth tracking in the chain composer.
+ *
+ * **Limitation:** This interceptor checks `ctx.invocationDepth`, which is always 0
+ * for top-level chain invocations. It only fires when a delegated agent (called via
+ * `ctx.delegateAndWait`) also has this interceptor and enters via the registry's
+ * interceptor chain. Since `ctx.delegateAndWait` calls `targetAgent.invokeAgent`
+ * directly (bypassing the chain), this interceptor is primarily belt-and-suspenders
+ * for future scenarios where delegated calls may route through the registry.
+ *
+ * The actual depth protection lives in `ctx.delegateAndWait`'s internal
+ * `nextDepth > maxDepth` check in the chain composer.
+ *
+ * @example
+ * ```ts
+ * const registry = new AgentRegistry([
+ *   {
+ *     agent: MyAgent,
+ *     channels: [slackChannel],
+ *     interceptors: [
+ *       createDepthGuardInterceptor({ maxDepth: 5 })
+ *     ]
+ *   }
+ * ]);
+ * ```
+ */
+export function createDepthGuardInterceptor(config: DepthGuardConfig = {}): Interceptor {
+  const maxDepth = config.maxDepth ?? 5;
+
+  return async (input: AgentInput, ctx: InterceptorContext, next: NextFunction): Promise<InterceptorResult> => {
+    if (ctx.invocationDepth > maxDepth) {
+      config.onDepthExceeded?.(ctx.invocationDepth, maxDepth, input);
+      ctx.logger?.error(`Depth guard: invocation depth ${ctx.invocationDepth} exceeds maximum ${maxDepth}`, {
+        currentDepth: ctx.invocationDepth,
+        maxDepth,
+      });
+      throw new DepthExceededError(ctx.invocationDepth, maxDepth);
+    }
+
+    return await next();
+  };
+}
diff --git a/packages/toolpack-agents/src/interceptors/builtins/event-dedup.ts b/packages/toolpack-agents/src/interceptors/builtins/event-dedup.ts
new file mode 100644
index 0000000..eb7a8d5
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/event-dedup.ts
@@ -0,0 +1,98 @@
+import type { AgentInput } from '../../agent/types.js';
+import type { Interceptor, InterceptorContext, InterceptorResult, NextFunction } from '../types.js';
+
+/**
+ * LRU cache for tracking seen event IDs.
+ * Simple Map-based implementation with size limit.
+ */
+class LRUCache<T> {
+  private cache: Map<string, T> = new Map();
+
+  constructor(private maxSize: number) {}
+
+  has(key: string): boolean {
+    return this.cache.has(key);
+  }
+
+  set(key: string, value: T): void {
+    // If key exists, delete it first to move to end (most recent)
+    if (this.cache.has(key)) {
+      this.cache.delete(key);
+    }
+
+    // If at capacity, remove oldest (first item)
+    if (this.cache.size >= this.maxSize) {
+      const firstKey = this.cache.keys().next().value;
+      if (firstKey !== undefined) {
+        this.cache.delete(firstKey);
+      }
+    }
+
+    this.cache.set(key, value);
+  }
+
+  clear(): void {
+    this.cache.clear();
+  }
+
+  size(): number {
+    return this.cache.size;
+  }
+}
+
+/**
+ * Configuration for the event deduplication interceptor.
+ */
+export interface EventDedupConfig {
+  /** Maximum number of event IDs to cache (default: 1000) */
+  maxCacheSize?: number;
+
+  /** Function to extract event ID from input. Defaults to input.conversationId */
+  getEventId?: (input: AgentInput) => string | undefined;
+
+  /** Optional callback when duplicate is detected */
+  onDuplicate?: (eventId: string, input: AgentInput) => void;
+}
+
+/**
+ * Creates an event deduplication interceptor.
+ *
+ * Drops duplicate events based on event ID (e.g., Slack retries, webhook redeliveries).
+ * Uses an LRU cache to track recently seen event IDs.
+ *
+ * @example
+ * ```ts
+ * const registry = new AgentRegistry([
+ *   {
+ *     agent: MyAgent,
+ *     channels: [slackChannel],
+ *     interceptors: [
+ *       createEventDedupInterceptor({ maxCacheSize: 500 })
+ *     ]
+ *   }
+ * ]);
+ * ```
+ */
+export function createEventDedupInterceptor(config: EventDedupConfig = {}): Interceptor {
+  const maxCacheSize = config.maxCacheSize ?? 1000;
+  const getEventId = config.getEventId ?? ((input: AgentInput) => input.context?.eventId as string | undefined);
+  const seenEvents = new LRUCache<boolean>(maxCacheSize);
+
+  return async (input: AgentInput, ctx: InterceptorContext, next: NextFunction): Promise<InterceptorResult> => {
+    const eventId = getEventId(input);
+
+    if (eventId) {
+      if (seenEvents.has(eventId)) {
+        // Duplicate detected - skip silently
+        config.onDuplicate?.(eventId, input);
+        ctx.logger?.debug(`Event dedup: dropping duplicate event ${eventId}`, { eventId });
+        return ctx.skip();
+      }
+
+      // Mark as seen
+      seenEvents.set(eventId, true);
+    }
+
+    return await next();
+  };
+}
diff --git a/packages/toolpack-agents/src/interceptors/builtins/index.ts b/packages/toolpack-agents/src/interceptors/builtins/index.ts
new file mode 100644
index 0000000..de38d4a
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/index.ts
@@ -0,0 +1,13 @@
+// Built-in interceptors shipped with the agents package
+// All are opt-in via the registration list - none run unless explicitly listed
+
+export { createEventDedupInterceptor, type EventDedupConfig } from './event-dedup.js';
+export { createNoiseFilterInterceptor, type NoiseFilterConfig } from './noise-filter.js';
+export { createSelfFilterInterceptor, type SelfFilterConfig } from './self-filter.js';
+export { createRateLimitInterceptor, type RateLimitConfig } from './rate-limit.js';
+export { createParticipantResolverInterceptor, type ParticipantResolverConfig } from './participant-resolver.js';
+export { createCaptureInterceptor, CAPTURE_INTERCEPTOR_MARKER, type CaptureHistoryConfig } from './capture-history.js';
+export { createAddressCheckInterceptor, type AddressCheckConfig, type AddressCheckResult } from './address-check.js';
+export { createIntentClassifierInterceptor, type IntentClassifierInterceptorConfig } from './intent-classifier.js';
+export { createDepthGuardInterceptor, type DepthGuardConfig, DepthExceededError } from './depth-guard.js';
+export { createTracerInterceptor, type TracerConfig } from './tracer.js';
diff --git a/packages/toolpack-agents/src/interceptors/builtins/intent-classifier.ts b/packages/toolpack-agents/src/interceptors/builtins/intent-classifier.ts
new file mode 100644
index 0000000..8d8a194
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/intent-classifier.ts
@@ -0,0 +1,148 @@
+import type { AgentInput } from '../../agent/types.js';
+import type { Interceptor, InterceptorContext, InterceptorResult, NextFunction } from '../types.js';
+import type { IntentClassifierInput, IntentClassification } from '../../capabilities/index.js';
+
+/**
+ * Configuration for the intent classifier interceptor.
+ */
+export interface IntentClassifierInterceptorConfig {
+  /** Name of the IntentClassifierAgent in the registry */
+  classifierAgentName?: string;
+
+  /** Function to extract message text from input */
+  getMessageText: (input: AgentInput) => string | undefined;
+
+  /** Agent's display name for classification context */
+  agentName: string;
+
+  /** Agent's unique ID */
+  agentId: string;
+
+  /** Sender name for classification context */
+  getSenderName: (input: AgentInput) => string;
+
+  /** Channel name for classification context */
+  getChannelName: (input: AgentInput) => string;
+
+  /** Check if this is a direct message */
+  isDirectMessage?: (input: AgentInput) => boolean;
+
+  /** Optional: Get recent context messages */
+  getRecentContext?: (input: AgentInput) => Array<{ sender: string; content: string }>;
+
+  /** Optional callback when classification is made */
+  onClassified?: (classification: IntentClassification, input: AgentInput) => void;
+}
+
+/**
+ * Creates an intent classifier interceptor.
+ *
+ * Delegates to the IntentClassifierAgent for ambiguous address-check cases.
+ * Should be placed AFTER the address-check interceptor.
+ *
+ * Only runs when address-check result is 'ambiguous' or 'indirect'.
+ * Skips response for 'passive' and 'ignore' classifications.
+ *
+ * @example
+ * ```ts
+ * const registry = new AgentRegistry([
+ *   {
+ *     agent: MyAgent,
+ *     channels: [slackChannel],
+ *     interceptors: [
+ *       createAddressCheckInterceptor({ agentName: 'Assistant', ... }),
+ *       createIntentClassifierInterceptor({
+ *         agentName: 'Assistant',
+ *         agentId: 'U123456',
+ *         getMessageText: (input) => input.message || '',
+ *         getSenderName: (input) => input.context?.userName as string || 'Unknown',
+ *         getChannelName: (input) => input.context?.channelName as string || 'general',
+ *         classifierAgentName: 'intent-classifier' // capability agent name
+ *       })
+ *     ]
+ *   }
+ * ]);
+ * ```
+ */
+export function createIntentClassifierInterceptor(config: IntentClassifierInterceptorConfig): Interceptor {
+  const classifierAgentName = config.classifierAgentName ?? 'intent-classifier';
+
+  return async (input: AgentInput, ctx: InterceptorContext, next: NextFunction): Promise<InterceptorResult> => {
+    // Check if address-check already determined this is direct
+    const addressCheck = input.context?._addressCheck as string | undefined;
+
+    // If clearly direct, no need to classify
+    if (addressCheck === 'direct') {
+      return await next();
+    }
+
+    // If clearly ignore or passive, skip silently (no LLM call needed)
+    if (addressCheck === 'ignore' || addressCheck === 'passive') {
+      config.onClassified?.(addressCheck as 'ignore' | 'passive', input);
+      return ctx.skip();
+    }
+
+    // For ambiguous or indirect - run intent classifier to determine if agent should respond
+    const messageText = config.getMessageText(input) ?? '';
+
+    // Skip empty messages
+    if (!messageText.trim()) {
+      return await next();
+    }
+
+    // Build classifier input
+    const classifierInput: IntentClassifierInput = {
+      message: messageText,
+      agentName: config.agentName,
+      agentId: config.agentId,
+      senderName: config.getSenderName(input),
+      channelName: config.getChannelName(input),
+      isDirectMessage: config.isDirectMessage?.(input) ?? false,
+      recentContext: config.getRecentContext?.(input),
+    };
+
+    try {
+      // Delegate to intent classifier agent
+      const classifierResult = await ctx.delegateAndWait(classifierAgentName, {
+        message: 'classify',
+        data: classifierInput,
+        conversationId: input.conversationId,
+      });
+
+      // Parse classification from result
+      const classification = (classifierResult.output as string).trim() as IntentClassification;
+
+      config.onClassified?.(classification, input);
+      ctx.logger?.debug(`Intent classified as: ${classification}`, { classification });
+
+      // Enrich input with classification
+      const enrichedInput: AgentInput = {
+        ...input,
+        context: {
+          ...input.context,
+          _intentClassification: classification,
+        },
+      };
+
+      // Handle classification result
+      switch (classification) {
+        case 'direct':
+          // Continue to agent
+          return await next(enrichedInput);
+
+        case 'indirect':
+        case 'passive':
+        case 'ignore':
+        default:
+          // Don't respond
+          return ctx.skip();
+      }
+    } catch (error) {
+      // If classification fails, fall back to allowing the message
+      ctx.logger?.error('Intent classification failed, allowing message', {
+        error: error instanceof Error ? error.message : 'Unknown error',
+      });
+      return await next();
+    }
+  };
+}
diff --git a/packages/toolpack-agents/src/interceptors/builtins/noise-filter.ts b/packages/toolpack-agents/src/interceptors/builtins/noise-filter.ts
new file mode 100644
index 0000000..51d07a4
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/noise-filter.ts
@@ -0,0 +1,55 @@
+import type { AgentInput } from '../../agent/types.js';
+import type { Interceptor, InterceptorContext, InterceptorResult, NextFunction } from '../types.js';
+
+/**
+ * Configuration for the noise filter interceptor.
+ */
+export interface NoiseFilterConfig {
+  /** List of subtypes to drop (e.g., ['message_changed', 'message_deleted']) */
+  denySubtypes: string[];
+
+  /** Optional function to extract subtype from input */
+  getSubtype?: (input: AgentInput) => string | undefined;
+
+  /** Optional callback when noise is filtered */
+  onFiltered?: (subtype: string, input: AgentInput) => void;
+}
+
+/**
+ * Creates a noise filter interceptor.
+ *
+ * Drops messages whose subtype is in the deny-list.
+ * Useful for filtering out message edits, deletions, bot messages, etc.
+ *
+ * @example
+ * ```ts
+ * const registry = new AgentRegistry([
+ *   {
+ *     agent: MyAgent,
+ *     channels: [slackChannel],
+ *     interceptors: [
+ *       createNoiseFilterInterceptor({
+ *         denySubtypes: ['message_changed', 'message_deleted', 'bot_message']
+ *       })
+ *     ]
+ *   }
+ * ]);
+ * ```
+ */
+export function createNoiseFilterInterceptor(config: NoiseFilterConfig): Interceptor {
+  const getSubtype = config.getSubtype ?? ((input: AgentInput) => input.context?.subtype as string | undefined);
+  const denySet = new Set(config.denySubtypes);
+
+  return async (input: AgentInput, ctx: InterceptorContext, next: NextFunction): Promise<InterceptorResult> => {
+    const subtype = getSubtype(input);
+
+    if (subtype && denySet.has(subtype)) {
+      // Message subtype is in deny-list - skip silently
+      config.onFiltered?.(subtype, input);
+      ctx.logger?.debug(`Noise filter: dropping message with subtype "${subtype}"`, { subtype });
+      return ctx.skip();
+    }
+
+    return await next();
+  };
+}
diff --git a/packages/toolpack-agents/src/interceptors/builtins/participant-resolver.ts b/packages/toolpack-agents/src/interceptors/builtins/participant-resolver.ts
new file mode 100644
index 0000000..bfe7546
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/participant-resolver.ts
@@ -0,0 +1,112 @@
+import type { AgentInput, Participant } from '../../agent/types.js';
+import type { Interceptor, InterceptorContext, InterceptorResult, NextFunction } from '../types.js';
+
+/**
+ * Configuration for the participant resolver interceptor.
+ */
+export interface ParticipantResolverConfig {
+  /**
+   * Explicit resolver function. Takes precedence over the channel's
+   * `resolveParticipant` hook when provided.
+   *
+   * If omitted, the interceptor will call `ctx.channel.resolveParticipant`
+   * if the channel defines one. If neither is available, the input's
+   * existing `participant` field (populated by `channel.normalize()`) is
+   * passed through unchanged.
+   */
+  resolveParticipant?: (input: AgentInput) => Participant | undefined | Promise<Participant | undefined>;
+
+  /**
+   * Optional callback fired after a participant is resolved (from any
+   * source, including `channel.normalize()`).
+   */
+  onResolved?: (input: AgentInput, participant: Participant) => void;
+}
+
+/**
+ * Creates a participant resolver interceptor.
+ *
+ * Resolves the participant from input and enriches the input with participant
+ * information for downstream interceptors. This is a foundational interceptor
+ * that should typically be placed early in the chain so downstream interceptors
+ * have access to participant context.
+ *
+ * Note: This interceptor does NOT write to conversation history. It only
+ * enriches the input with participant metadata. History persistence must be
+ * handled separately by the application layer or a future history interceptor.
+ *
+ * @example
+ * ```ts
+ * const registry = new AgentRegistry([
+ *   {
+ *     agent: MyAgent,
+ *     channels: [slackChannel],
+ *     interceptors: [
+ *       createParticipantResolverInterceptor({
+ *         resolveParticipant: (input) => ({
+ *           kind: 'user',
+ *           id: input.context?.userId as string,
+ *           displayName: input.context?.userName as string
+ *         }),
+ *         onResolved: (input, participant) => {
+ *           // Optionally persist to your own history store
+ *           historyStore.append({ participant, message: input.message });
+ *         }
+ *       })
+ *     ]
+ *   }
+ * ]);
+ * ```
+ */
+export function createParticipantResolverInterceptor(
+  config: ParticipantResolverConfig = {}
+): Interceptor {
+  return async (input: AgentInput, ctx: InterceptorContext, next: NextFunction): Promise<InterceptorResult> => {
+    // Resolution order:
+    //   1. Explicit `config.resolveParticipant`
+    //   2. Channel's own `resolveParticipant` hook (lazy, cached)
+    //   3. Whatever the channel already placed on `input.participant`
+    let resolved: Participant | undefined;
+
+    if (config.resolveParticipant) {
+      resolved = await config.resolveParticipant(input);
+    } else if (typeof ctx.channel.resolveParticipant === 'function') {
+      try {
+        resolved = await ctx.channel.resolveParticipant(input);
+      } catch (error) {
+        // Resolver must never crash the pipeline - log and fall through.
+        ctx.logger?.warn('Channel resolveParticipant threw; falling back', {
+          error: error instanceof Error ? error.message : 'Unknown error',
+        });
+      }
+    }
+
+    // Merge resolved participant over whatever normalize() already set,
+    // so a later lookup of `displayName` takes precedence over id-only.
+    const participant = resolved ?? input.participant;
+
+    if (participant) {
+      const enrichedInput: AgentInput = {
+        ...input,
+        participant,
+        // Keep legacy context slot populated for back-compat with older
+        // interceptors that read `context._participant`.
+        context: {
+          ...input.context,
+          _participant: participant,
+        },
+      };
+
+      config.onResolved?.(enrichedInput, participant);
+      ctx.logger?.debug('Resolved participant', {
+        participantId: participant.id,
+        participantKind: participant.kind,
+      });
+
+      return await next(enrichedInput);
+    }
+
+    // Nothing to enrich - pass through unchanged.
+    return await next();
+  };
+}
diff --git a/packages/toolpack-agents/src/interceptors/builtins/rate-limit.ts b/packages/toolpack-agents/src/interceptors/builtins/rate-limit.ts
new file mode 100644
index 0000000..bd8c27c
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/rate-limit.ts
@@ -0,0 +1,170 @@
+import type { AgentInput } from '../../agent/types.js';
+import type { Interceptor, InterceptorContext, InterceptorResult, NextFunction } from '../types.js';
+
+/**
+ * LRU cache for rate limit buckets.
+ * Prevents unbounded memory growth in high-traffic scenarios.
+ */
+class LRUCache<T> {
+  private cache: Map<string, T> = new Map();
+
+  constructor(private maxSize: number) {}
+
+  get(key: string): T | undefined {
+    const value = this.cache.get(key);
+    if (value !== undefined) {
+      // Move to end (most recently used)
+      this.cache.delete(key);
+      this.cache.set(key, value);
+    }
+    return value;
+  }
+
+  set(key: string, value: T): void {
+    // If key exists, delete it first to move to end
+    if (this.cache.has(key)) {
+      this.cache.delete(key);
+    } else if (this.cache.size >= this.maxSize) {
+      // Remove oldest (first item)
+      const firstKey = this.cache.keys().next().value;
+      if (firstKey !== undefined) {
+        this.cache.delete(firstKey);
+      }
+    }
+    this.cache.set(key, value);
+  }
+
+  clear(): void {
+    this.cache.clear();
+  }
+
+  size(): number {
+    return this.cache.size;
+  }
+}
+
+/**
+ * Token bucket for rate limiting.
+ */
+class TokenBucket {
+  private tokens: number;
+  private lastRefill: number;
+
+  constructor(
+    private capacity: number,
+    private refillRate: number, // tokens per second
+    private refillInterval: number // milliseconds
+  ) {
+    this.tokens = capacity;
+    this.lastRefill = Date.now();
+  }
+
+  consume(tokens: number = 1): boolean {
+    this.refill();
+
+    if (this.tokens >= tokens) {
+      this.tokens -= tokens;
+      return true;
+    }
+
+    return false;
+  }
+
+  private refill(): void {
+    const now = Date.now();
+    const elapsed = now - this.lastRefill;
+    const tokensToAdd = Math.floor((elapsed / this.refillInterval) * this.refillRate);
+
+    if (tokensToAdd > 0) {
+      this.tokens = Math.min(this.capacity, this.tokens + tokensToAdd);
+      this.lastRefill = now;
+    }
+  }
+
+  getTokens(): number {
+    this.refill();
+    return this.tokens;
+  }
+}
+
+/**
+ * Configuration for the rate limit interceptor.
+ */
+export interface RateLimitConfig {
+  /** Tokens per interval (default: 10) */
+  tokensPerInterval?: number;
+
+  /** Interval in milliseconds (default: 60000 = 1 minute) */
+  interval?: number;
+
+  /** Maximum number of buckets to cache (default: 1000). LRU eviction when exceeded. */
+  maxBuckets?: number;
+
+  /** Function to extract rate limit key from input (e.g., user ID, conversation ID) */
+  getKey: (input: AgentInput) => string;
+
+  /** Behavior when rate limit exceeded: 'skip' silently or 'reject' with error (default: 'skip') */
+  onExceeded?: 'skip' | 'reject';
+
+  /** Optional callback when rate limit is hit */
+  onRateLimited?: (key: string, input: AgentInput) => void;
+}
+
+/**
+ * Creates a rate limit interceptor.
+ *
+ * Token-bucket rate limiting per user or conversation.
+ * Skips or rejects when rate exceeded.
+ *
+ * @example
+ * ```ts
+ * const registry = new AgentRegistry([
+ *   {
+ *     agent: MyAgent,
+ *     channels: [slackChannel],
+ *     interceptors: [
+ *       createRateLimitInterceptor({
+ *         getKey: (input) => input.context?.userId as string || 'default',
+ *         tokensPerInterval: 5,
+ *         interval: 60000, // 5 messages per minute per user
+ *         onExceeded: 'skip'
+ *       })
+ *     ]
+ *   }
+ * ]);
+ * ```
+ */
+export function createRateLimitInterceptor(config: RateLimitConfig): Interceptor {
+  const tokensPerInterval = config.tokensPerInterval ?? 10;
+  const interval = config.interval ?? 60000;
+  const maxBuckets = config.maxBuckets ?? 1000;
+  const onExceeded = config.onExceeded ?? 'skip';
+
+  // LRU bucket cache per key to prevent unbounded memory growth
+  const buckets = new LRUCache<TokenBucket>(maxBuckets);
+
+  return async (input: AgentInput, ctx: InterceptorContext, next: NextFunction): Promise<InterceptorResult> => {
+    const key = config.getKey(input);
+
+    // Get or create bucket for this key
+    let bucket = buckets.get(key);
+    if (!bucket) {
+      bucket = new TokenBucket(tokensPerInterval, tokensPerInterval, interval);
+      buckets.set(key, bucket);
+    }
+
+    if (!bucket.consume()) {
+      // Rate limit exceeded
+      config.onRateLimited?.(key, input);
+      ctx.logger?.warn(`Rate limit exceeded for key: ${key}`, { key });
+
+      if (onExceeded === 'reject') {
+        throw new Error(`Rate limit exceeded. Please try again later.`);
+      }
+
+      return ctx.skip();
+    }
+
+    return await next();
+  };
+}
diff --git a/packages/toolpack-agents/src/interceptors/builtins/self-filter.ts b/packages/toolpack-agents/src/interceptors/builtins/self-filter.ts
new file mode 100644
index 0000000..5c9b826
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/self-filter.ts
@@ -0,0 +1,57 @@
+import type { AgentInput } from '../../agent/types.js';
+import type { Interceptor, InterceptorContext, InterceptorResult, NextFunction } from '../types.js';
+
+/**
+ * Configuration for the self filter interceptor.
+ */
+export interface SelfFilterConfig {
+  /**
+   * Platform-specific agent ID (e.g., Slack user ID "U123456").
+   * If not provided, falls back to the agent's registered name.
+   */
+  agentId?: string;
+
+  /** Function to extract sender ID from input */
+  getSenderId: (input: AgentInput) => string | undefined;
+
+  /** Optional callback when self-message is detected */
+  onSelfMessage?: (senderId: string, input: AgentInput) => void;
+}
+
+/**
+ * Creates a self filter interceptor (loop guard).
+ *
+ * Drops messages where the sender ID equals the agent's own ID.
+ * Prevents infinite loops where the agent responds to its own messages.
+ *
+ * @example
+ * ```ts
+ * const registry = new AgentRegistry([
+ *   {
+ *     agent: MyAgent,
+ *     channels: [slackChannel],
+ *     interceptors: [
+ *       createSelfFilterInterceptor({
+ *         agentId: 'U0123456', // Slack bot user ID
+ *         getSenderId: (input) => input.context?.senderId as string
+ *       })
+ *     ]
+ *   }
+ * ]);
+ * ```
+ */
+export function createSelfFilterInterceptor(config: SelfFilterConfig): Interceptor {
+  return async (input: AgentInput, ctx: InterceptorContext, next: NextFunction): Promise<InterceptorResult> => {
+    const senderId = config.getSenderId(input);
+    const agentId = config.agentId ?? ctx.agent.name; // Use platform ID if provided, else agent name
+
+    if (senderId && senderId === agentId) {
+      // Message is from self - skip to prevent loop
+      config.onSelfMessage?.(senderId, input);
+      ctx.logger?.debug(`Self filter: dropping self-message from ${senderId}`, { senderId, agentId });
+      return ctx.skip();
+    }
+
+    return await next();
+  };
+}
diff --git a/packages/toolpack-agents/src/interceptors/builtins/tracer.ts b/packages/toolpack-agents/src/interceptors/builtins/tracer.ts
new file mode 100644
index 0000000..26607bb
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/builtins/tracer.ts
@@ -0,0 +1,117 @@
+import type { AgentInput } from '../../agent/types.js';
+import type { Interceptor, InterceptorContext, InterceptorResult, NextFunction } from '../types.js';
+import { isSkipSentinel } from '../types.js';
+
+/**
+ * Configuration for the tracer interceptor.
+ */
+export interface TracerConfig {
+  /**
+   * Log level for tracing (default: 'debug')
+   */
+  level?: 'debug' | 'info';
+
+  /**
+   * Whether to include full input data in logs (default: false)
+   */
+  includeInputData?: boolean;
+
+  /**
+   * Whether to include full result output in logs (default: false)
+   */
+  includeResultOutput?: boolean;
+
+  /**
+   * Optional: Filter which inputs to trace
+   */
+  shouldTrace?: (input: AgentInput) => boolean;
+}
+
+/**
+ * Creates a tracer interceptor.
+ *
+ * Structured logging of each hop for debugging.
+ * Logs entry (before calling next) and exit (after receiving result).
+ *
+ * @example
+ * ```ts
+ * const registry = new AgentRegistry([
+ *   {
+ *     agent: MyAgent,
+ *     channels: [slackChannel],
+ *     interceptors: [
+ *       createTracerInterceptor({ level: 'debug', includeInputData: true })
+ *     ]
+ *   }
+ * ]);
+ * ```
+ */
+export function createTracerInterceptor(config: TracerConfig = {}): Interceptor {
+  const level = config.level ?? 'debug';
+  const includeInputData = config.includeInputData ?? false;
+  const includeResultOutput = config.includeResultOutput ?? false;
+
+  return async (input: AgentInput, ctx: InterceptorContext, next: NextFunction): Promise<InterceptorResult> => {
+    // Check if we should trace this input
+    if (config.shouldTrace && !config.shouldTrace(input)) {
+      return await next();
+    }
+
+    const logMethod = level === 'info' ? ctx.logger?.info : ctx.logger?.debug;
+
+    // Log entry
+    logMethod?.('Interceptor entry', {
+      agent: ctx.agent.name,
+      channel: ctx.channel.name,
+      depth: ctx.invocationDepth,
+      conversationId: input.conversationId,
+      intent: input.intent,
+      input: includeInputData ? input : undefined,
+    });
+
+    const startTime = performance.now();
+
+    try {
+      const result = await next();
+      const duration = performance.now() - startTime;
+
+      // Log exit
+      if (isSkipSentinel(result)) {
+        logMethod?.('Interceptor exit: skipped', {
+          agent: ctx.agent.name,
+          channel: ctx.channel.name,
+          depth: ctx.invocationDepth,
+          conversationId: input.conversationId,
+          durationMs: duration.toFixed(2),
+        });
+      } else {
+        logMethod?.('Interceptor exit: success', {
+          agent: ctx.agent.name,
+          channel: ctx.channel.name,
+          depth: ctx.invocationDepth,
+          conversationId: input.conversationId,
+          durationMs: duration.toFixed(2),
+          outputLength: result.output.length,
+          result: includeResultOutput ? result : undefined,
+        });
+      }
+
+      return result;
+    } catch (error) {
+      const duration = performance.now() - startTime;
+
+      // Log error
+      ctx.logger?.error('Interceptor exit: error', {
+        agent: ctx.agent.name,
+        channel: ctx.channel.name,
+        depth: ctx.invocationDepth,
+        conversationId: input.conversationId,
+        durationMs: duration.toFixed(2),
+        error: error instanceof Error ? error.message : 'Unknown error',
+        errorType: error?.constructor?.name,
+      });
+
+      throw error;
+    }
+  };
+}
diff --git a/packages/toolpack-agents/src/interceptors/chain.test.ts b/packages/toolpack-agents/src/interceptors/chain.test.ts
new file mode 100644
index 0000000..8eee032
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/chain.test.ts
@@ -0,0 +1,555 @@
+import { describe, it, expect, vi } from 'vitest';
+import type { AgentInput, AgentResult, AgentInstance, ChannelInterface } from '../agent/types.js';
+import type { IAgentRegistry } from '../agent/types.js';
+import {
+  type Interceptor,
+  type InterceptorContext,
+  SKIP_SENTINEL,
+  skip,
+  isSkipSentinel,
+} from './types.js';
+import {
+  composeChain,
+  executeChain,
+  InvocationDepthExceededError,
+} from './chain.js';
+
+// Mock agent
+function createMockAgent(name: string, result: AgentResult): AgentInstance {
+  return {
+    name,
+    description: `Mock ${name}`,
+    mode: 'chat',
+    invokeAgent: vi.fn().mockResolvedValue(result),
+  } as unknown as AgentInstance;
+}
+
+// Mock channel
+function createMockChannel(name: string): ChannelInterface {
+  return {
+    name,
+    isTriggerChannel: false,
+    listen: vi.fn(),
+    send: vi.fn().mockResolvedValue(undefined),
+    normalize: vi.fn(),
+    onMessage: vi.fn(),
+  };
+}
+
+// Mock registry
+function createMockRegistry(agents: Map<string, AgentInstance>): IAgentRegistry {
+  return {
+    start: vi.fn(),
+    sendTo: vi.fn().mockResolvedValue(undefined),
+    getAgent: vi.fn((name: string) => agents.get(name)),
+    getAllAgents: vi.fn(() => Array.from(agents.values())),
+    getPendingAsk: vi.fn(),
+    addPendingAsk: vi.fn(),
+    resolvePendingAsk: vi.fn().mockResolvedValue(undefined),
+    hasPendingAsks: vi.fn(),
+    incrementRetries: vi.fn(),
+    cleanupExpiredAsks: vi.fn().mockReturnValue(0),
+  } as unknown as IAgentRegistry;
+}
+
+describe('Interceptor Chain', () => {
+  const baseInput: AgentInput = {
+    message: 'Hello',
+    conversationId: 'conv-1',
+  };
+
+  const baseResult: AgentResult = {
+    output: 'Hi there!',
+  };
+
+  describe('composeChain', () => {
+    it('invokes agent directly when no interceptors', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const chain = composeChain([], agent, channel, registry);
+      const result = await chain.execute(baseInput);
+
+      expect(agent.invokeAgent).toHaveBeenCalledWith(baseInput);
+      expect(result).toEqual(baseResult);
+    });
+
+    it('executes single interceptor in order', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const order: string[] = [];
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        order.push('interceptor-in');
+        const result = await next();
+        order.push('interceptor-out');
+        return result;
+      };
+
+      const chain = composeChain([interceptor], agent, channel, registry);
+      await chain.execute(baseInput);
+
+      expect(order).toEqual(['interceptor-in', 'interceptor-out']);
+    });
+
+    it('executes multiple interceptors in correct order (outermost first)', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const order: string[] = [];
+
+      const interceptor1: Interceptor = async (input, ctx, next) => {
+        order.push('outer-in');
+        const result = await next();
+        order.push('outer-out');
+        return result;
+      };
+
+      const interceptor2: Interceptor = async (input, ctx, next) => {
+        order.push('inner-in');
+        const result = await next();
+        order.push('inner-out');
+        return result;
+      };
+
+      const chain = composeChain([interceptor1, interceptor2], agent, channel, registry);
+      await chain.execute(baseInput);
+
+      // First interceptor is outermost: runs first in, last out
+      expect(order).toEqual(['outer-in', 'inner-in', 'inner-out', 'outer-out']);
+    });
+
+    it('allows interceptor to short-circuit by not calling next', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const shortCircuitResult: AgentResult = {
+        output: 'Short-circuited!',
+        metadata: { shortCircuited: true },
+      };
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        // Don't call next - return early
+        return shortCircuitResult;
+      };
+
+      const chain = composeChain([interceptor], agent, channel, registry);
+      const result = await chain.execute(baseInput);
+
+      expect(agent.invokeAgent).not.toHaveBeenCalled();
+      expect(result).toEqual(shortCircuitResult);
+    });
+
+    it('provides correct context to interceptor', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      let capturedCtx: InterceptorContext | undefined;
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        capturedCtx = ctx;
+        return await next();
+      };
+
+      const chain = composeChain([interceptor], agent, channel, registry);
+      await chain.execute(baseInput);
+
+      expect(capturedCtx).toBeDefined();
+      expect(capturedCtx!.agent).toBe(agent);
+      expect(capturedCtx!.channel).toBe(channel);
+      expect(capturedCtx!.registry).toBe(registry);
+      expect(capturedCtx!.invocationDepth).toBe(0);
+      expect(typeof capturedCtx!.delegateAndWait).toBe('function');
+      expect(typeof capturedCtx!.skip).toBe('function');
+    });
+
+    it('initial invocation depth is 0 at top-level', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      let capturedDepth: number | undefined;
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        capturedDepth = ctx.invocationDepth;
+        return await next();
+      };
+
+      const chain = composeChain([interceptor], agent, channel, registry);
+      await chain.execute(baseInput);
+
+      // Top-level chain starts at depth 0
+      expect(capturedDepth).toBe(0);
+    });
+
+    it('delegateAndWait increments depth for nested delegation', async () => {
+      // This test verifies that when an interceptor at depth 0 calls delegateAndWait,
+      // the delegated agent is invoked with the next depth level (1)
+      const delegateResult: AgentResult = { output: 'Delegated!' };
+      const delegateAgent = createMockAgent('delegate', delegateResult);
+      const mainAgent = createMockAgent('main', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map([['delegate', delegateAgent]]));
+
+      // Track the depth check in delegateAndWait
+      let depthCheckPassed = false;
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        // At depth 0, try to delegate - this should use depth 1 for the check
+        if (ctx.invocationDepth === 0) {
+          await ctx.delegateAndWait('delegate', { message: 'test' });
+          depthCheckPassed = true;
+        }
+        return await next();
+      };
+
+      const chain = composeChain([interceptor], mainAgent, channel, registry, {
+        maxInvocationDepth: 5, // Allow up to depth 5
+      });
+
+      await chain.execute(baseInput);
+
+      // Delegation succeeded at depth 1 (0 + 1)
+      expect(depthCheckPassed).toBe(true);
+      expect(delegateAgent.invokeAgent).toHaveBeenCalled();
+    });
+  });
+
+  describe('skip sentinel', () => {
+    it('supports skip() helper from context', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        return ctx.skip();
+      };
+
+      const chain = composeChain([interceptor], agent, channel, registry);
+      const result = await chain.execute(baseInput);
+
+      expect(result).toBe(SKIP_SENTINEL);
+      expect(isSkipSentinel(result)).toBe(true);
+      expect(agent.invokeAgent).not.toHaveBeenCalled();
+    });
+
+    it('skip() returns SKIP_SENTINEL symbol', () => {
+      expect(skip()).toBe(SKIP_SENTINEL);
+    });
+
+    it('isSkipSentinel correctly identifies sentinel', () => {
+      expect(isSkipSentinel(SKIP_SENTINEL)).toBe(true);
+      expect(isSkipSentinel({ output: 'test' })).toBe(false);
+      expect(isSkipSentinel(null as unknown as typeof SKIP_SENTINEL)).toBe(false);
+      expect(isSkipSentinel(undefined as unknown as typeof SKIP_SENTINEL)).toBe(false);
+    });
+  });
+
+  describe('executeChain helper', () => {
+    it('returns AgentResult when not skipped', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const chain = composeChain([], agent, channel, registry);
+      const result = await executeChain(chain, baseInput);
+
+      expect(result).toEqual(baseResult);
+    });
+
+    it('returns null when skipped', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        return ctx.skip();
+      };
+
+      const chain = composeChain([interceptor], agent, channel, registry);
+      const result = await executeChain(chain, baseInput);
+
+      expect(result).toBeNull();
+    });
+  });
+
+  describe('delegation', () => {
+    it('delegateAndWait invokes target agent', async () => {
+      const delegateResult: AgentResult = { output: 'Delegated result!' };
+      const delegateAgent = createMockAgent('delegate', delegateResult);
+      const mainAgent = createMockAgent('main', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map([['delegate', delegateAgent]]));
+
+      let delegatedResult: AgentResult | undefined;
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        delegatedResult = await ctx.delegateAndWait('delegate', {
+          message: 'Please help',
+          data: { extra: 'context' },
+        });
+        return await next();
+      };
+
+      const chain = composeChain([interceptor], mainAgent, channel, registry);
+      await chain.execute(baseInput);
+
+      expect(delegateAgent.invokeAgent).toHaveBeenCalledWith(
+        expect.objectContaining({
+          message: 'Please help',
+          data: { extra: 'context' },
+          // Inherits conversationId from original input (baseInput.conversationId = 'conv-1')
+          conversationId: 'conv-1',
+        })
+      );
+      expect(delegatedResult).toEqual(delegateResult);
+    });
+
+    it('throws when delegating to non-existent agent', async () => {
+      const mainAgent = createMockAgent('main', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map()); // empty
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        await ctx.delegateAndWait('nonexistent', { message: 'test' });
+        return await next();
+      };
+
+      const chain = composeChain([interceptor], mainAgent, channel, registry);
+
+      await expect(chain.execute(baseInput)).rejects.toThrow(
+        'Agent "nonexistent" not found for delegation'
+      );
+    });
+
+    it('throws InvocationDepthExceededError when past max depth', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      let error: Error | undefined;
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        try {
+          // Try to delegate at max depth
+          await ctx.delegateAndWait('test', { message: 'test' });
+        } catch (e) {
+          error = e as Error;
+        }
+        return await next();
+      };
+
+      const chain = composeChain([interceptor], agent, channel, registry, {
+        maxInvocationDepth: 0, // Zero tolerance
+      });
+      await chain.execute(baseInput);
+
+      expect(error).toBeInstanceOf(InvocationDepthExceededError);
+      // At depth 0, trying to delegate results in nextDepth=1, which exceeds maxDepth=0
+      expect(error?.message).toContain('Invocation depth 1 exceeds maximum 0');
+    });
+
+    it('inherits conversationId from original input when delegating', async () => {
+      const delegateResult: AgentResult = { output: 'Delegated!' };
+      const delegateAgent = createMockAgent('delegate', delegateResult);
+      const mainAgent = createMockAgent('main', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map([['delegate', delegateAgent]]));
+
+      let delegatedInput: AgentInput | undefined;
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        await ctx.delegateAndWait('delegate', { message: 'test' });
+        return await next();
+      };
+
+      (delegateAgent.invokeAgent as ReturnType<typeof vi.fn>).mockImplementation((input: AgentInput) => {
+        delegatedInput = input;
+        return Promise.resolve(delegateResult);
+      });
+
+      const chain = composeChain([interceptor], mainAgent, channel, registry);
+      await chain.execute({ ...baseInput, conversationId: 'original-conv-123' });
+
+      // Delegated call should inherit conversationId from original execute input
+      expect(delegatedInput?.conversationId).toBe('original-conv-123');
+    });
+
+    it('allows override of conversationId in delegation', async () => {
+      const delegateResult: AgentResult = { output: 'Delegated!' };
+      const delegateAgent = createMockAgent('delegate', delegateResult);
+      const mainAgent = createMockAgent('main', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map([['delegate', delegateAgent]]));
+
+      let delegatedInput: AgentInput | undefined;
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        await ctx.delegateAndWait('delegate', {
+          message: 'test',
+          conversationId: 'custom-conv-456', // Explicitly set
+        });
+        return await next();
+      };
+
+      (delegateAgent.invokeAgent as ReturnType<typeof vi.fn>).mockImplementation((input: AgentInput) => {
+        delegatedInput = input;
+        return Promise.resolve(delegateResult);
+      });
+
+      const chain = composeChain([interceptor], mainAgent, channel, registry);
+      await chain.execute({ ...baseInput, conversationId: 'original-conv-123' });
+
+      // Delegated call should use the explicitly provided conversationId
+      expect(delegatedInput?.conversationId).toBe('custom-conv-456');
+    });
+  });
+
+  describe('error propagation', () => {
+    it('propagates errors from interceptor', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        throw new Error('Interceptor error!');
+      };
+
+      const chain = composeChain([interceptor], agent, channel, registry);
+
+      await expect(chain.execute(baseInput)).rejects.toThrow('Interceptor error!');
+    });
+
+    it('propagates errors from agent', async () => {
+      const agent = createMockAgent('test', baseResult);
+      (agent.invokeAgent as ReturnType<typeof vi.fn>).mockRejectedValue(
+        new Error('Agent error!')
+      );
+
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const chain = composeChain([], agent, channel, registry);
+
+      await expect(chain.execute(baseInput)).rejects.toThrow('Agent error!');
+    });
+
+    it('still runs post-processing when error occurs downstream', async () => {
+      const agent = createMockAgent('test', baseResult);
+      (agent.invokeAgent as ReturnType<typeof vi.fn>).mockRejectedValue(
+        new Error('Agent error!')
+      );
+
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const postProcessingRan: boolean[] = [];
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        try {
+          return await next();
+        } catch {
+          postProcessingRan.push(true);
+          return { output: 'recovered' };
+        }
+      };
+
+      const chain = composeChain([interceptor], agent, channel, registry);
+
+      // The interceptor catches and recovers
+      const result = await chain.execute(baseInput);
+
+      expect(postProcessingRan).toContain(true);
+      expect(result).toEqual({ output: 'recovered' });
+    });
+  });
+
+  describe('interceptor can transform input', () => {
+    it('allows interceptor to modify input before passing to next', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      let receivedInput: AgentInput | undefined;
+
+      const innerInterceptor: Interceptor = async (input, ctx, next) => {
+        receivedInput = input;
+        return await next();
+      };
+
+      const outerInterceptor: Interceptor = async (input, ctx, next) => {
+        const modifiedInput: AgentInput = {
+          ...input,
+          message: 'Modified: ' + input.message,
+          context: { modified: true },
+        };
+        // Pass modified input downstream
+        return await next(modifiedInput);
+      };
+
+      const chain = composeChain([outerInterceptor, innerInterceptor], agent, channel, registry);
+      await chain.execute(baseInput);
+
+      // The inner interceptor should receive the modified input
+      expect(receivedInput?.message).toBe('Modified: Hello');
+      expect(receivedInput?.context).toEqual({ modified: true });
+    });
+
+    it('uses original input when next() called without arguments', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      let receivedInput: AgentInput | undefined;
+
+      const innerInterceptor: Interceptor = async (input, ctx, next) => {
+        receivedInput = input;
+        return await next();
+      };
+
+      const outerInterceptor: Interceptor = async (input, ctx, next) => {
+        // Call next() without passing input - should use original
+        return await next();
+      };
+
+      const chain = composeChain([outerInterceptor, innerInterceptor], agent, channel, registry);
+      await chain.execute(baseInput);
+
+      // The inner interceptor should receive the original input
+      expect(receivedInput?.message).toBe('Hello');
+    });
+  });
+
+  describe('interceptor can transform result', () => {
+    it('allows interceptor to modify result on way out', async () => {
+      const agent = createMockAgent('test', baseResult);
+      const channel = createMockChannel('test-channel');
+      const registry = createMockRegistry(new Map());
+
+      const interceptor: Interceptor = async (input, ctx, next) => {
+        const result = await next();
+        if (!isSkipSentinel(result)) {
+          return {
+            ...result,
+            metadata: { ...result.metadata, intercepted: true },
+          };
+        }
+        return result;
+      };
+
+      const chain = composeChain([interceptor], agent, channel, registry);
+      const result = await chain.execute(baseInput);
+
+      expect(result).toEqual({
+        output: 'Hi there!',
+        metadata: { intercepted: true },
+      });
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/interceptors/chain.ts b/packages/toolpack-agents/src/interceptors/chain.ts
new file mode 100644
index 0000000..372afe5
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/chain.ts
@@ -0,0 +1,154 @@
+import type { AgentInput, AgentResult, AgentInstance, ChannelInterface } from '../agent/types.js';
+import type { IAgentRegistry } from '../agent/types.js';
+import {
+  type Interceptor,
+  type InterceptorContext,
+  type NextFunction,
+  type InterceptorResult,
+  type InterceptorChainConfig,
+  SKIP_SENTINEL,
+  skip,
+} from './types.js';
+
+/**
+ * Composed chain of interceptors ready to execute.
+ */
+export interface ComposedChain {
+  /** Execute the chain with the given input */
+  execute(input: AgentInput): Promise<InterceptorResult>;
+}
+
+/**
+ * Error thrown when invocation depth exceeds the configured maximum.
+ */
+export class InvocationDepthExceededError extends Error {
+  constructor(currentDepth: number, maxDepth: number) {
+    super(`Invocation depth ${currentDepth} exceeds maximum ${maxDepth}`);
+    this.name = 'InvocationDepthExceededError';
+  }
+}
+
+/**
+ * Compose an array of interceptors into an executable chain.
+ *
+ * The first interceptor in the array is outermost (runs first on way in,
+ * last on way out). The final handler invokes the agent directly.
+ *
+ * @param interceptors Ordered array of interceptors (empty = direct agent call)
+ * @param agent The agent to invoke at the end of the chain
+ * @param channel The triggering channel
+ * @param registry The agent registry
+ * @param config Chain configuration
+ * @returns Composed chain ready to execute
+ *
+ * @example
+ * ```ts
+ * const chain = composeChain(
+ *   [eventDedup, noiseFilter, intentClassifier],
+ *   agent,
+ *   channel,
+ *   registry,
+ *   { maxInvocationDepth: 5 }
+ * );
+ * const result = await chain.execute(input);
+ * ```
+ */
+export function composeChain(
+  interceptors: Interceptor[],
+  agent: AgentInstance,
+  channel: ChannelInterface,
+  registry: IAgentRegistry | null,
+  config: InterceptorChainConfig = {}
+): ComposedChain {
+  const maxDepth = config.maxInvocationDepth ?? 5;
+
+  return {
+    async execute(executeInput: AgentInput): Promise<InterceptorResult> {
+      // Create context inside execute to close over the execute-time input
+      const createContext = (depth: number): InterceptorContext => ({
+        agent,
+        channel,
+        registry,
+        invocationDepth: depth,
+        delegateAndWait: async (agentName: string, delegateInput: Partial<AgentInput>) => {
+          const nextDepth = depth + 1;
+          if (nextDepth > maxDepth) {
+            throw new InvocationDepthExceededError(nextDepth, maxDepth);
+          }
+
+          if (!registry) {
+            throw new Error(`Cannot delegate to "${agentName}": agent is running in standalone mode without a registry`);
+          }
+
+          const targetAgent = registry.getAgent(agentName);
+          if (!targetAgent) {
+            throw new Error(`Agent "${agentName}" not found for delegation`);
+          }
+
+          // Build full input with inheritance from original execute input
+          const fullInput: AgentInput = {
+            message: delegateInput.message ?? '',
+            intent: delegateInput.intent,
+            data: delegateInput.data,
+            context: delegateInput.context,
+            // Inherit conversationId from delegate input, then original execute input, then fallback
+            conversationId: delegateInput.conversationId
+              ?? executeInput.conversationId
+              ?? `delegation-${Date.now()}`,
+          };
+
+          // Invoke target agent directly (interceptors don't apply on delegate calls)
+          return await targetAgent.invokeAgent(fullInput);
+        },
+        skip,
+      });
+
+      const ctx = createContext(0);
+
+      // Build the chain from inside out
+      // Start with the final handler (agent invocation)
+      let chain: NextFunction = async (overrideInput?: AgentInput) => {
+        const effectiveInput = overrideInput ?? executeInput;
+        const result = await agent.invokeAgent(effectiveInput);
+        return result;
+      };
+
+      // Wrap with interceptors in reverse order (so first interceptor is outermost)
+      for (let i = interceptors.length - 1; i >= 0; i--) {
+        const interceptor = interceptors[i];
+        const next = chain;
+
+        chain = async (overrideInput?: AgentInput) => {
+          const effectiveInput = overrideInput ?? executeInput;
+          return await interceptor(effectiveInput, ctx, next);
+        };
+      }
+
+      // Execute the chain
+      return await chain();
+    },
+  };
+}
+
+/**
+ * Execute a chain with the given input, handling the skip sentinel.
+ *
+ * Returns `null` if the chain was skipped (caller should not send to channel),
+ * otherwise returns the AgentResult.
+ *
+ * @param chain The composed chain
+ * @param input The agent input
+ * @returns AgentResult or null if skipped
+ */
+export async function executeChain(
+  chain: ComposedChain,
+  input: AgentInput
+): Promise<AgentResult | null> {
+  const result = await chain.execute(input);
+
+  if (result === SKIP_SENTINEL) {
+    return null;
+  }
+
+  return result;
+}
diff --git a/packages/toolpack-agents/src/interceptors/index.ts b/packages/toolpack-agents/src/interceptors/index.ts
new file mode 100644
index 0000000..babe15b
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/index.ts
@@ -0,0 +1,47 @@
+// Interceptor system for composable agent middleware
+// Enables cross-cutting concerns like filtering, classification, and rate limiting
+
+export {
+  SKIP_SENTINEL,
+  type InterceptorResult,
+  type InterceptorContext,
+  type NextFunction,
+  type Interceptor,
+  type InterceptorChainConfig,
+  isSkipSentinel,
+  skip,
+} from './types.js';
+
+export {
+  type ComposedChain,
+  InvocationDepthExceededError,
+  composeChain,
+  executeChain,
+} from './chain.js';
+
+// Built-in interceptors
+export {
+  createEventDedupInterceptor,
+  type EventDedupConfig,
+  createNoiseFilterInterceptor,
+  type NoiseFilterConfig,
+  createSelfFilterInterceptor,
+  type SelfFilterConfig,
+  createRateLimitInterceptor,
+  type RateLimitConfig,
+  createParticipantResolverInterceptor,
+  type ParticipantResolverConfig,
+  createCaptureInterceptor,
+  CAPTURE_INTERCEPTOR_MARKER,
+  type CaptureHistoryConfig,
+  createAddressCheckInterceptor,
+  type AddressCheckConfig,
+  type AddressCheckResult,
+  createIntentClassifierInterceptor,
+  type IntentClassifierInterceptorConfig,
+  createDepthGuardInterceptor,
+  type DepthGuardConfig,
+  DepthExceededError,
+  createTracerInterceptor,
+  type TracerConfig,
+} from './builtins/index.js';
diff --git a/packages/toolpack-agents/src/interceptors/types.ts b/packages/toolpack-agents/src/interceptors/types.ts
new file mode 100644
index 0000000..297c69f
--- /dev/null
+++ b/packages/toolpack-agents/src/interceptors/types.ts
@@ -0,0 +1,129 @@
+import type { AgentInput, AgentResult, AgentInstance, ChannelInterface } from '../agent/types.js';
+import type { IAgentRegistry } from '../agent/types.js';
+
+/**
+ * Sentinel value indicating the interceptor chain should end silently.
+ * When returned by an interceptor, the registry must not call `channel.send`.
+ */
+export const SKIP_SENTINEL = Symbol('interceptor-skip-sentinel');
+
+/**
+ * Result from an interceptor or the chain.
+ * - `AgentResult`: Normal result, send to channel
+ * - `SkipSentinel`: Silent skip, do not send
+ */
+export type InterceptorResult = AgentResult | typeof SKIP_SENTINEL;
+
+/**
+ * Check if a result is the skip sentinel.
+ */
+export function isSkipSentinel(result: InterceptorResult): result is typeof SKIP_SENTINEL {
+  return result === SKIP_SENTINEL;
+}
+
+/**
+ * Helper function to create a skip sentinel result.
+ * Use this in interceptors to signal "do not reply".
+ */
+export function skip(): typeof SKIP_SENTINEL {
+  return SKIP_SENTINEL;
+}
+
+/**
+ * Context available to each interceptor during chain execution.
+ */
+export interface InterceptorContext {
+  /** The agent instance the chain wraps */
+  agent: AgentInstance;
+
+  /** The channel that triggered this invocation */
+  channel: ChannelInterface;
+
+  /** The registry for agent lookup and delegation. Null in standalone (single-agent) mode. */
+  registry: IAgentRegistry | null;
+
+  /** Current invocation depth (0 = top-level) */
+  invocationDepth: number;
+
+  /**
+   * Delegate to another agent synchronously (depth-aware).
+   * Increments invocation depth. Rejects if past depth cap.
+   */
+  delegateAndWait(agentName: string, input: Partial<AgentInput>): Promise<AgentResult>;
+
+  /**
+   * Signal that the chain should end silently.
+   * Returns the skip sentinel - use `return ctx.skip()` to short-circuit.
+   */
+  skip: () => typeof SKIP_SENTINEL;
+
+  /** Optional structured logger (wired by registry) */
+  logger?: {
+    debug: (message: string, meta?: Record<string, unknown>) => void;
+    info: (message: string, meta?: Record<string, unknown>) => void;
+    warn: (message: string, meta?: Record<string, unknown>) => void;
+    error: (message: string, meta?: Record<string, unknown>) => void;
+  };
+}
+
+/**
+ * Next function in the interceptor chain.
+ * Call this to continue to the next interceptor or the final agent invocation.
+ *
+ * Optionally pass a modified input to downstream interceptors/agents.
+ * If no input is provided, the original input is used.
+ *
+ * @example
+ * ```ts
+ * // Pass modified input downstream
+ * const modifiedInput = { ...input, context: { ...input.context, annotated: true } };
+ * return await next(modifiedInput);
+ *
+ * // Or pass original input unchanged
+ * return await next();
+ * ```
+ */
+export type NextFunction = (input?: AgentInput) => Promise<InterceptorResult>;
+
+/**
+ * Interceptor function signature.
+ * Middleware-style pattern: inspect/transform input, optionally continue.
+ *
+ * @param input The incoming agent input
+ * @param ctx Context with agent, channel, registry, helpers
+ * @param next Continue to next interceptor/agent
+ * @returns Result (or skip sentinel to end silently)
+ *
+ * @example
+ * ```ts
+ * const myInterceptor: Interceptor = async (input, ctx, next) => {
+ *   // Pre-processing
+ *   if (shouldIgnore(input)) {
+ *     return ctx.skip(); // Short-circuit silently
+ *   }
+ *
+ *   // Continue chain
+ *   const result = await next();
+ *
+ *   // Post-processing (optional)
+ *   if (!isSkipSentinel(result)) {
+ *     result.metadata = { ...result.metadata, intercepted: true };
+ *   }
+ *
+ *   return result;
+ * };
+ * ```
+ */
+export type Interceptor = (
+  input: AgentInput,
+  ctx: InterceptorContext,
+  next: NextFunction
+) => Promise<InterceptorResult>;
+
+/**
+ * Configuration for the interceptor chain.
+ */
+export interface InterceptorChainConfig {
+  /** Maximum invocation depth for delegation (default: 5) */
+  maxInvocationDepth?: number;
+}
diff --git a/packages/toolpack-agents/src/registry/index.test.ts b/packages/toolpack-agents/src/registry/index.test.ts
new file mode 100644
index 0000000..8f78b39
--- /dev/null
+++ b/packages/toolpack-agents/src/registry/index.test.ts
@@ -0,0 +1,354 @@
+import { describe, it, expect, vi, beforeEach, afterEach } from 'vitest';
+import { searchRegistry, RegistryError } from './search.js';
+
+describe('registry', () => {
+  const originalFetch = globalThis.fetch;
+
+  beforeEach(() => {
+    globalThis.fetch = vi.fn();
+  });
+
+  afterEach(() => {
+    globalThis.fetch = originalFetch;
+    vi.restoreAllMocks();
+  });
+
+  describe('searchRegistry', () => {
+    it('should search for toolpack-agent packages', async () => {
+      const mockResponse = {
+        objects: [
+          {
+            package: {
+              name: 'toolpack-agent-research',
+              version: '1.0.0',
+              description: 'A research agent',
+              keywords: ['toolpack-agent', 'research'],
+              date: '2024-01-01',
+              toolpack: {
+                agent: true,
+                category: 'research',
+                description: 'Research agent for web data',
+                tags: ['web', 'research'],
+              },
+              links: {
+                npm: 'https://www.npmjs.com/package/toolpack-agent-research',
+              },
+            },
+            score: { final: 0.9 },
+          },
+          {
+            package: {
+              name: 'toolpack-agent-coding',
+              version: '2.0.0',
+              description: 'A coding agent',
+              keywords: ['toolpack-agent', 'coding'],
+              date: '2024-01-02',
+              toolpack: {
+                agent: true,
+                category: 'coding',
+                description: 'Coding assistant agent',
+              },
+              links: {
+                npm: 'https://www.npmjs.com/package/toolpack-agent-coding',
+              },
+            },
+            score: { final: 0.8 },
+          },
+        ],
+        total: 2,
+      };
+
+      vi.mocked(fetch).mockResolvedValueOnce({
+        ok: true,
+        json: async () => mockResponse,
+      } as Response);
+
+      const result = await searchRegistry();
+
+      expect(result.agents).toHaveLength(2);
+      expect(result.agents[0].name).toBe('toolpack-agent-research');
+      expect(result.agents[0].toolpack?.category).toBe('research');
+      expect(result.total).toBe(2);
+      expect(result.hasMore).toBe(false);
+    });
+
+    it('should filter by keyword', async () => {
+      const mockResponse = {
+        objects: [
+          {
+            package: {
+              name: 'toolpack-agent-finance',
+              version: '1.0.0',
+              description: 'Finance agent',
+              keywords: ['toolpack-agent', 'finance'],
+              toolpack: {
+                agent: true,
+                category: 'research',
+                tags: ['finance'],
+              },
+            },
+          },
+        ],
+        total: 1,
+      };
+
+      vi.mocked(fetch).mockResolvedValueOnce({
+        ok: true,
+        json: async () => mockResponse,
+      } as Response);
+
+      const result = await searchRegistry({ keyword: 'finance' });
+
+      expect(vi.mocked(fetch)).toHaveBeenCalledWith(
+        expect.stringContaining('text=toolpack-agent+finance'),
+        expect.any(Object)
+      );
+      expect(result.agents).toHaveLength(1);
+    });
+
+    it('should filter by category', async () => {
+      const mockResponse = {
+        objects: [
+          {
+            package: {
+              name: 'agent-1',
+              version: '1.0.0',
+              toolpack: { agent: true, category: 'research' },
+            },
+          },
+          {
+            package: {
+              name: 'agent-2',
+              version: '1.0.0',
+              toolpack: { agent: true, category: 'coding' },
+            },
+          },
+          {
+            package: {
+              name: 'agent-3',
+              version: '1.0.0',
+              toolpack: { agent: true, category: 'research' },
+            },
+          },
+        ],
+        total: 3,
+      };
+
+      vi.mocked(fetch).mockResolvedValueOnce({
+        ok: true,
+        json: async () => mockResponse,
+      } as Response);
+
+      const result = await searchRegistry({ category: 'research' });
+
+      expect(result.agents).toHaveLength(2);
+      expect(result.agents.every(a => a.toolpack?.category === 'research')).toBe(true);
+    });
+
+    it('should filter by tag', async () => {
+      const mockResponse = {
+        objects: [
+          {
+            package: {
+              name: 'agent-1',
+              version: '1.0.0',
+              toolpack: { agent: true, tags: ['ai', 'ml'] },
+            },
+          },
+          {
+            package: {
+              name: 'agent-2',
+              version: '1.0.0',
+              toolpack: { agent: true, tags: ['web'] },
+            },
+          },
+          {
+            package: {
+              name: 'agent-3',
+              version: '1.0.0',
+              keywords: ['ai'],
+              toolpack: { agent: true },
+            },
+          },
+        ],
+        total: 3,
+      };
+
+      vi.mocked(fetch).mockResolvedValueOnce({
+        ok: true,
+        json: async () => mockResponse,
+      } as Response);
+
+      const result = await searchRegistry({ tag: 'ai' });
+
+      expect(result.agents).toHaveLength(2);
+    });
+
+    it('should only include packages with toolpack.agent = true', async () => {
+      const mockResponse = {
+        objects: [
+          {
+            package: {
+              name: 'valid-agent',
+              version: '1.0.0',
+              toolpack: { agent: true, category: 'research' },
+            },
+          },
+          {
+            package: {
+              name: 'invalid-agent',
+              version: '1.0.0',
+              keywords: ['toolpack-agent'],
+              // Missing toolpack.agent = true
+            },
+          },
+          {
+            package: {
+              name: 'another-valid',
+              version: '1.0.0',
+              toolpack: { agent: true, category: 'coding' },
+            },
+          },
+        ],
+        total: 3,
+      };
+
+      vi.mocked(fetch).mockResolvedValueOnce({
+        ok: true,
+        json: async () => mockResponse,
+      } as Response);
+
+      const result = await searchRegistry();
+
+      expect(result.agents).toHaveLength(2);
+      expect(result.agents.map(a => a.name)).toContain('valid-agent');
+      expect(result.agents.map(a => a.name)).toContain('another-valid');
+      expect(result.agents.map(a => a.name)).not.toContain('invalid-agent');
+    });
+
+    it('should handle pagination', async () => {
+      const mockResponse = {
+        objects: Array.from({ length: 30 }, (_, i) => ({
+          package: {
+            name: `agent-${i}`,
+            version: '1.0.0',
+            toolpack: { agent: true },
+          },
+        })),
+        total: 30,
+      };
+
+      vi.mocked(fetch).mockResolvedValue({
+        ok: true,
+        json: async () => mockResponse,
+      } as Response);
+
+      const result1 = await searchRegistry({ limit: 10, offset: 0 });
+      expect(result1.agents).toHaveLength(10);
+      expect(result1.hasMore).toBe(true);
+      expect(result1.agents[0].name).toBe('agent-0');
+
+      const result2 = await searchRegistry({ limit: 10, offset: 10 });
+      expect(result2.agents).toHaveLength(10);
+      expect(result2.hasMore).toBe(true);
+      expect(result2.agents[0].name).toBe('agent-10');
+
+      const result3 = await searchRegistry({ limit: 10, offset: 20 });
+      expect(result3.agents).toHaveLength(10);
+      expect(result3.hasMore).toBe(false);
+      expect(result3.agents[0].name).toBe('agent-20');
+    });
+
+    it('should use custom registry URL', async () => {
+      vi.mocked(fetch).mockResolvedValueOnce({
+        ok: true,
+        json: async () => ({ objects: [], total: 0 }),
+      } as Response);
+
+      await searchRegistry({ registryUrl: 'https://private.registry.com' });
+
+      expect(vi.mocked(fetch)).toHaveBeenCalledWith(
+        expect.stringContaining('https://private.registry.com'),
+        expect.any(Object)
+      );
+    });
+
+    it('should throw RegistryError on HTTP error', async () => {
+      vi.mocked(fetch).mockResolvedValue({
+        ok: false,
+        status: 500,
+        statusText: 'Internal Server Error',
+        json: async () => ({}),
+      } as Response);
+
+      await expect(searchRegistry()).rejects.toThrow(RegistryError);
+      await expect(searchRegistry()).rejects.toThrow('NPM registry search failed');
+    });
+
+    it('should throw RegistryError on fetch failure', async () => {
+      vi.mocked(fetch).mockRejectedValueOnce(new Error('Network error'));
+
+      await expect(searchRegistry()).rejects.toThrow(RegistryError);
+      await expect(searchRegistry()).rejects.toThrow('Failed to search registry');
+    });
+
+    it('should extract all toolpack metadata fields', async () => {
+      const mockResponse = {
+        objects: [
+          {
+            package: {
+              name: 'complete-agent',
+              version: '1.2.3',
+              description: 'Full featured agent',
+              keywords: ['toolpack-agent'],
+              author: 'John Doe',
+              date: '2024-01-15',
+              links: {
+                npm: 'https://npm.example.com/complete-agent',
+                homepage: 'https://example.com',
+                repository: 'https://github.com/example/agent',
+                bugs: 'https://github.com/example/agent/issues',
+              },
+              publisher: { username: 'johndoe', email: 'john@example.com' },
+              maintainers: [{ username: 'johndoe', email: 'john@example.com' }],
+              toolpack: {
+                agent: true,
+                category: 'research',
+                description: 'Detailed agent description',
+                tags: ['ai', 'ml', 'nlp'],
+                author: 'Toolpack Team',
+                repository: 'https://github.com/toolpack/complete-agent',
+                homepage: 'https://toolpack.dev/complete-agent',
+              },
+            },
+          },
+        ],
+        total: 1,
+      };
+
+      vi.mocked(fetch).mockResolvedValueOnce({
+        ok: true,
+        json: async () => mockResponse,
+      } as Response);
+
+      const result = await searchRegistry();
+      const agent = result.agents[0];
+
+      expect(agent.name).toBe('complete-agent');
+      expect(agent.version).toBe('1.2.3');
+      expect(agent.description).toBe('Full featured agent');
+      expect(agent.toolpack?.agent).toBe(true);
+      expect(agent.toolpack?.category).toBe('research');
+      expect(agent.toolpack?.description).toBe('Detailed agent description');
+      expect(agent.toolpack?.tags).toEqual(['ai', 'ml', 'nlp']);
+      expect(agent.toolpack?.author).toBe('Toolpack Team');
+      expect(agent.toolpack?.repository).toBe('https://github.com/toolpack/complete-agent');
+      expect(agent.toolpack?.homepage).toBe('https://toolpack.dev/complete-agent');
+      expect(agent.author).toBe('John Doe');
+      expect(agent.date).toBe('2024-01-15');
+      expect(agent.links?.npm).toBe('https://npm.example.com/complete-agent');
+      expect(agent.publisher?.username).toBe('johndoe');
+      expect(agent.maintainers).toHaveLength(1);
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/registry/index.ts b/packages/toolpack-agents/src/registry/index.ts
new file mode 100644
index 0000000..0d7d5da
--- /dev/null
+++ b/packages/toolpack-agents/src/registry/index.ts
@@ -0,0 +1,13 @@
+// Registry for toolpack-agents
+// Discover and publish community-built agents
+
+// Search functionality
+export { searchRegistry, RegistryError } from './search.js';
+
+// Types
+export type {
+  ToolpackAgentMetadata,
+  RegistryAgent,
+  SearchRegistryOptions,
+  SearchRegistryResult,
+} from './types.js';
diff --git a/packages/toolpack-agents/src/registry/search.ts b/packages/toolpack-agents/src/registry/search.ts
new file mode 100644
index 0000000..ee8116b
--- /dev/null
+++ b/packages/toolpack-agents/src/registry/search.ts
@@ -0,0 +1,222 @@
+import type {
+  RegistryAgent,
+  SearchRegistryOptions,
+  SearchRegistryResult,
+  ToolpackAgentMetadata,
+} from './types.js';
+
+/**
+ * NPM registry search response format.
+ */
+interface NpmSearchResponse {
+  objects: Array<{
+    package: {
+      name: string;
+      version: string;
+      description?: string;
+      keywords?: string[];
+      date?: string;
+      links?: {
+        npm?: string;
+        homepage?: string;
+        repository?: string;
+        bugs?: string;
+      };
+      publisher?: {
+        username?: string;
+        email?: string;
+      };
+      maintainers?: Array<{
+        username?: string;
+        email?: string;
+      }>;
+      author?: string | { name?: string; email?: string };
+      [key: string]: unknown;
+    };
+    score?: {
+      final?: number;
+      detail?: {
+        quality?: number;
+        popularity?: number;
+        maintenance?: number;
+      };
+    };
+    searchScore?: number;
+  }>;
+  total: number;
+  time?: string;
+}
+
+/**
+ * Searches the NPM registry for toolpack agents.
+ *
+ * Queries packages with the "toolpack-agent" keyword and filters
+ * by optional category, tags, and search keywords.
+ *
+ * @example
+ * ```ts
+ * import { searchRegistry } from '@toolpack-sdk/agents/registry';
+ *
+ * // Search all agents
+ * const results = await searchRegistry();
+ *
+ * // Search by keyword
+ * const results = await searchRegistry({ keyword: 'fintech' });
+ *
+ * // Filter by category
+ * const results = await searchRegistry({ category: 'research' });
+ *
+ * // Combined search
+ * const results = await searchRegistry({
+ *   keyword: 'stock',
+ *   category: 'research',
+ *   limit: 10,
+ * });
+ *
+ * // Display results
+ * for (const agent of results.agents) {
+ *   console.log(`${agent.name}: ${agent.toolpack?.description || agent.description}`);
+ *   console.log(`  Install: npm install ${agent.name}`);
+ * }
+ * ```
+ *
+ * @param options Search options
+ * @returns Search results with agents and pagination info
+ */
+export async function searchRegistry(
+  options: SearchRegistryOptions = {}
+): Promise<SearchRegistryResult> {
+  const {
+    keyword,
+    category,
+    tag,
+    limit = 20,
+    offset = 0,
+    registryUrl = 'https://registry.npmjs.org',
+  } = options;
+
+  // Build search query - always include toolpack-agent keyword
+  const searchTerms: string[] = ['toolpack-agent'];
+  if (keyword) {
+    searchTerms.push(keyword);
+  }
+  if (tag) {
+    searchTerms.push(tag);
+  }
+
+  const query = searchTerms.join(' ');
+
+  // Build the NPM registry search URL
+  // NPM search API: /-/v1/search?text=...&size=...&from=...
+  const searchUrl = new URL('/-/v1/search', registryUrl);
+  searchUrl.searchParams.set('text', query);
+  searchUrl.searchParams.set('size', String(Math.min(limit + offset, 250))); // NPM max is 250
+  searchUrl.searchParams.set('from', String(0)); // We'll handle offset in memory for filtering
+
+  try {
+    const response = await fetch(searchUrl.toString(), {
+      headers: {
+        Accept: 'application/json',
+      },
+    });
+
+    if (!response.ok) {
+      throw new RegistryError(
+        `NPM registry search failed: ${response.status} ${response.statusText}`
+      );
+    }
+
+    const data = (await response.json()) as NpmSearchResponse;
+
+    // Transform and filter results
+    let agents: RegistryAgent[] = data.objects.map(obj => {
+      const pkg = obj.package;
+      const toolpack = extractToolpackMetadata(pkg);
+
+      return {
+        name: pkg.name,
+        version: pkg.version,
+        description: pkg.description,
+        toolpack,
+        keywords: pkg.keywords,
+        author: pkg.author,
+        date: pkg.date,
+        links: pkg.links,
+        publisher: pkg.publisher,
+        maintainers: pkg.maintainers,
+      };
+    });
+
+    // Filter by category if specified
+    if (category) {
+      agents = agents.filter(
+        agent => agent.toolpack?.category?.toLowerCase() === category.toLowerCase()
+      );
+    }
+
+    // Filter by tag if specified
+    if (tag) {
+      const tagLower = tag.toLowerCase();
+      agents = agents.filter(
+        agent =>
+          agent.toolpack?.tags?.some(t => t.toLowerCase() === tagLower) ||
+          agent.keywords?.some(k => k.toLowerCase() === tagLower)
+      );
+    }
+
+    // Only include packages with toolpack.agent = true
+    agents = agents.filter(agent => agent.toolpack?.agent === true);
+
+    // Apply offset and limit
+    const total = agents.length;
+    agents = agents.slice(offset, offset + limit);
+
+    return {
+      agents,
+      total,
+      offset,
+      limit,
+      hasMore: total > offset + limit,
+    };
+  } catch (error) {
+    if (error instanceof RegistryError) {
+      throw error;
+    }
+    throw new RegistryError(
+      `Failed to search registry: ${error instanceof Error ? error.message : String(error)}`
+    );
+  }
+}
+
+/**
+ * Extracts toolpack metadata from package.json data.
+ */
+function extractToolpackMetadata(pkg: Record<string, unknown>): ToolpackAgentMetadata | undefined {
+  const toolpack = pkg.toolpack as Record<string, unknown> | undefined;
+
+  if (!toolpack || toolpack.agent !== true) {
+    return undefined;
+  }
+
+  return {
+    agent: true,
+    category: typeof toolpack.category === 'string' ? toolpack.category : undefined,
+    description: typeof toolpack.description === 'string' ? toolpack.description : undefined,
+    tags: Array.isArray(toolpack.tags)
+      ? toolpack.tags.filter((t): t is string => typeof t === 'string')
+      : undefined,
+    author: typeof toolpack.author === 'string' ? toolpack.author : undefined,
+    repository: typeof toolpack.repository === 'string' ? toolpack.repository : undefined,
+    homepage: typeof toolpack.homepage === 'string' ? toolpack.homepage : undefined,
+  };
+}
+
+/**
+ * Error thrown when registry operations fail.
+ */
+export class RegistryError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'RegistryError';
+  }
+}
diff --git a/packages/toolpack-agents/src/registry/types.ts b/packages/toolpack-agents/src/registry/types.ts
new file mode 100644
index 0000000..98de68d
--- /dev/null
+++ b/packages/toolpack-agents/src/registry/types.ts
@@ -0,0 +1,138 @@
+/**
+ * Types for the toolpack-agents registry.
+ * Used for discovering and publishing community agents.
+ */
+
+/**
+ * Metadata that should be included in a package.json to identify
+ * a package as a toolpack agent.
+ *
+ * @example
+ * ```json
+ * {
+ *   "name": "toolpack-agent-fintech-research",
+ *   "version": "1.0.0",
+ *   "keywords": ["toolpack-agent"],
+ *   "toolpack": {
+ *     "agent": true,
+ *     "category": "research",
+ *     "description": "Research agent focused on fintech news and regulatory updates",
+ *     "tags": ["fintech", "research", "news"],
+ *     "author": "John Doe",
+ *     "repository": "https://github.com/johndoe/toolpack-agent-fintech-research",
+ *     "homepage": "https://example.com/fintech-agent"
+ *   }
+ * }
+ * ```
+ */
+export interface ToolpackAgentMetadata {
+  /** Must be true to be recognized as an agent */
+  agent: true;
+
+  /** Category for grouping (e.g., 'research', 'coding', 'data', 'custom') */
+  category?: string;
+
+  /** Short description of what the agent does */
+  description?: string;
+
+  /** Tags for searchability */
+  tags?: string[];
+
+  /** Author name or organization */
+  author?: string;
+
+  /** Repository URL */
+  repository?: string;
+
+  /** Homepage URL */
+  homepage?: string;
+}
+
+/**
+ * An agent entry returned from the registry search.
+ */
+export interface RegistryAgent {
+  /** Package name */
+  name: string;
+
+  /** Package version */
+  version: string;
+
+  /** Package description from npm */
+  description?: string;
+
+  /** Toolpack-specific metadata */
+  toolpack?: ToolpackAgentMetadata;
+
+  /** NPM keywords */
+  keywords?: string[];
+
+  /** Package author */
+  author?: string | { name?: string; email?: string };
+
+  /** NPM registry date */
+  date?: string;
+
+  /** NPM registry links */
+  links?: {
+    npm?: string;
+    homepage?: string;
+    repository?: string;
+    bugs?: string;
+  };
+
+  /** NPM registry publisher info */
+  publisher?: {
+    username?: string;
+    email?: string;
+  };
+
+  /** NPM maintainers */
+  maintainers?: Array<{
+    username?: string;
+    email?: string;
+  }>;
+}
+
+/**
+ * Options for searching the registry.
+ */
+export interface SearchRegistryOptions {
+  /** Search query string */
+  keyword?: string;
+
+  /** Filter by category */
+  category?: string;
+
+  /** Filter by tag */
+  tag?: string;
+
+  /** Maximum number of results (default: 20) */
+  limit?: number;
+
+  /** Offset for pagination (default: 0) */
+  offset?: number;
+
+  /** NPM registry URL (default: https://registry.npmjs.org) */
+  registryUrl?: string;
+}
+
+/**
+ * Result from a registry search.
+ */
+export interface SearchRegistryResult {
+  /** List of matching agents */
+  agents: RegistryAgent[];
+
+  /** Total number of results (may be approximate) */
+  total: number;
+
+  /** Offset used for this query */
+  offset: number;
+
+  /** Limit used for this query */
+  limit: number;
+
+  /** Whether more results are available */
+  hasMore: boolean;
+}
diff --git a/packages/toolpack-agents/src/testing/capture-events.ts b/packages/toolpack-agents/src/testing/capture-events.ts
new file mode 100644
index 0000000..3c20b29
--- /dev/null
+++ b/packages/toolpack-agents/src/testing/capture-events.ts
@@ -0,0 +1,193 @@
+import { BaseAgent } from '../agent/base-agent.js';
+
+export type AgentEventName = 'agent:start' | 'agent:complete' | 'agent:error';
+
+export interface CapturedEvent {
+  name: AgentEventName;
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  data: any;
+  timestamp: number;
+}
+
+export interface EventCapture {
+  /** All captured events */
+  events: CapturedEvent[];
+
+  /** Number of events captured */
+  count: number;
+
+  /** Clear all captured events */
+  clear(): void;
+
+  /** Stop capturing events and remove listeners */
+  stop(): void;
+
+  /** Check if an event with the given name was captured */
+  hasEvent(name: AgentEventName): boolean;
+
+  /** Get all events with the given name */
+  getEvents(name: AgentEventName): CapturedEvent[];
+
+  /** Get the first event with the given name, or undefined if none */
+  getFirstEvent(name: AgentEventName): CapturedEvent | undefined;
+
+  /** Get the last event with the given name, or undefined if none */
+  getLastEvent(name: AgentEventName): CapturedEvent | undefined;
+
+  /** Assert that an event was captured (throws if not) */
+  assertEvent(name: AgentEventName): void;
+
+  /** Assert that an event was NOT captured (throws if it was) */
+  assertNoEvent(name: AgentEventName): void;
+}
+
+/**
+ * Captures events emitted by a BaseAgent during testing.
+ * Useful for asserting that certain lifecycle events were fired.
+ *
+ * @example
+ * ```ts
+ * const { agent } = createTestAgent(MyAgent);
+ * const events = captureEvents(agent);
+ *
+ * await agent.invokeAgent({ message: 'Do something' });
+ *
+ * expect(events.hasEvent('agent:start')).toBe(true);
+ * expect(events.hasEvent('agent:complete')).toBe(true);
+ * expect(events.hasEvent('agent:error')).toBe(false);
+ *
+ * // Or use assertion helpers
+ * events.assertEvent('agent:start');
+ * events.assertEvent('agent:complete');
+ * events.assertNoEvent('agent:error');
+ * ```
+ *
+ * @param agent The agent to capture events from
+ * @returns Event capture object with assertion helpers
+ */
+export function captureEvents(agent: BaseAgent): EventCapture {
+  const events: CapturedEvent[] = [];
+  const listeners: Array<{ event: AgentEventName; handler: (...args: unknown[]) => void }> = [];
+
+  const createHandler = (eventName: AgentEventName) => {
+    return (data: unknown) => {
+      events.push({
+        name: eventName,
+        data,
+        timestamp: Date.now(),
+      });
+    };
+  };
+
+  // Attach listeners for all agent events
+  const eventNames: AgentEventName[] = ['agent:start', 'agent:complete', 'agent:error'];
+
+  for (const eventName of eventNames) {
+    const handler = createHandler(eventName);
+    agent.on(eventName, handler);
+    listeners.push({ event: eventName, handler });
+  }
+
+  return {
+    get events() {
+      return [...events];
+    },
+
+    get count() {
+      return events.length;
+    },
+
+    clear() {
+      events.length = 0;
+    },
+
+    stop() {
+      for (const { event, handler } of listeners) {
+        agent.off(event, handler);
+      }
+      listeners.length = 0;
+    },
+
+    hasEvent(name: AgentEventName): boolean {
+      return events.some(e => e.name === name);
+    },
+
+    getEvents(name: AgentEventName): CapturedEvent[] {
+      return events.filter(e => e.name === name);
+    },
+
+    getFirstEvent(name: AgentEventName): CapturedEvent | undefined {
+      return events.find(e => e.name === name);
+    },
+
+    getLastEvent(name: AgentEventName): CapturedEvent | undefined {
+      const filtered = events.filter(e => e.name === name);
+      return filtered[filtered.length - 1];
+    },
+
+    assertEvent(name: AgentEventName): void {
+      if (!this.hasEvent(name)) {
+        const capturedEventNames = events.map(e => e.name).join(', ') || '(none)';
+        throw new Error(`captureEvents: expected event "${name}" was not captured. Captured events: ${capturedEventNames}`);
+      }
+    },
+
+    assertNoEvent(name: AgentEventName): void {
+      if (this.hasEvent(name)) {
+        const count = events.filter(e => e.name === name).length;
+        throw new Error(`captureEvents: unexpected event "${name}" was captured ${count} time(s)`);
+      }
+    },
+  };
+}
+
+/**
+ * Custom Vitest/Jest matcher for asserting captured events.
+ * Add this to your test setup for more readable assertions.
+ *
+ * @example
+ * ```ts
+ * // In your test setup file
+ * import { expect } from 'vitest';
+ * import { registerEventMatchers } from '@toolpack-sdk/agents/testing';
+ * registerEventMatchers(expect);
+ *
+ * // In your tests
+ * expect(events).toContainEvent('agent:start');
+ * expect(events).not.toContainEvent('agent:error');
+ * ```
+ */
+export function registerEventMatchers(
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  expect: { extend: (matchers: Record<string, (...args: unknown[]) => { message: () => string; pass: boolean }>) => void }
+): void {
+  expect.extend({
+    toContainEvent(...args: unknown[]) {
+      const received = args[0] as EventCapture;
+      const expectedEvent = args[1] as AgentEventName;
+      const pass = received.hasEvent(expectedEvent);
+      return {
+        message: () =>
+          pass
+            ? `expected events to NOT contain "${expectedEvent}"`
+            : `expected events to contain "${expectedEvent}". Captured events: ${received.events.map(e => e.name).join(', ') || '(none)'}`,
+        pass,
+      };
+    },
+
+    toContainEventTimes(...args: unknown[]) {
+      const received = args[0] as EventCapture;
+      const expectedEvent = args[1] as AgentEventName;
+      const times = args[2] as number;
+      const count = received.getEvents(expectedEvent).length;
+      const pass = count === times;
+      return {
+        message: () =>
+          pass
+            ? `expected event "${expectedEvent}" to NOT be captured ${times} time(s), but it was`
+            : `expected event "${expectedEvent}" to be captured ${times} time(s), but it was captured ${count} time(s)`,
+        pass,
+      };
+    },
+  });
+}
diff --git a/packages/toolpack-agents/src/testing/create-test-agent.ts b/packages/toolpack-agents/src/testing/create-test-agent.ts
new file mode 100644
index 0000000..5d8059e
--- /dev/null
+++ b/packages/toolpack-agents/src/testing/create-test-agent.ts
@@ -0,0 +1,241 @@
+import type { Toolpack } from 'toolpack-sdk';
+import { BaseAgent } from '../agent/base-agent.js';
+import type { AgentInput, BaseAgentOptions } from '../agent/types.js';
+import { MockChannel } from './mock-channel.js';
+
+/**
+ * Configuration for mock responses in createTestAgent.
+ */
+export interface MockResponse {
+  /** String or regex to match against the message */
+  trigger: string | RegExp;
+  /** The response to return when triggered */
+  response: string;
+  /** Optional usage metadata */
+  usage?: { prompt_tokens: number; completion_tokens: number; total_tokens: number };
+}
+
+/**
+ * Options for createTestAgent.
+ */
+export interface CreateTestAgentOptions {
+  /** Mock responses for the toolpack.generate() call */
+  mockResponses?: MockResponse[];
+  /** Default response when no trigger matches */
+  defaultResponse?: string;
+  /** Provider name for the mock toolpack */
+  provider?: string;
+  /** Model name for the mock toolpack */
+  model?: string;
+}
+
+/**
+ * Result from createTestAgent.
+ */
+export interface TestAgentResult<TAgent extends BaseAgent> {
+  /** The agent instance */
+  agent: TAgent;
+  /** The mock channel wired to the agent */
+  channel: MockChannel;
+  /** The mock toolpack instance */
+  toolpack: Toolpack;
+  /** Helper to add more mock responses */
+  addMockResponse: (response: MockResponse) => void;
+}
+
+/**
+ * Creates an agent instance wired to a mock channel and mock toolpack.
+ * Perfect for unit testing agents in isolation.
+ *
+ * @example
+ * ```ts
+ * const { agent, channel, toolpack } = createTestAgent(CustomerSupportAgent, {
+ *   mockResponses: [
+ *     { trigger: 'refund', response: 'Refund processed successfully.' },
+ *   ],
+ * });
+ *
+ * const result = await agent.invokeAgent({
+ *   intent: 'refund_request',
+ *   message: 'I want a refund for order #123',
+ * });
+ *
+ * expect(result.output).toBe('Refund processed successfully.');
+ * ```
+ *
+ * @param AgentClass The agent class to instantiate
+ * @param options Configuration options
+ * @returns Test agent setup with agent, channel, and mock toolpack
+ */
+export function createTestAgent<TAgent extends BaseAgent>(
+  AgentClass: new (options: BaseAgentOptions) => TAgent,
+  options: CreateTestAgentOptions = {}
+): TestAgentResult<TAgent> {
+  const mockResponses: MockResponse[] = [...(options.mockResponses ?? [])];
+  const defaultResponse = options.defaultResponse ?? 'Mock AI response';
+
+  // Create mock toolpack
+  const toolpack = createMockToolpack(mockResponses, defaultResponse, options.provider, options.model);
+
+  // Create agent instance
+  const agent = new AgentClass({ toolpack });
+
+  // Create mock channel
+  const channel = new MockChannel();
+
+  // Wire up the channel to the agent manually
+  channel.onMessage(async (input: AgentInput) => {
+    // Set the agent's internal state as if it came through the registry
+    agent._triggeringChannel = channel.name;
+    agent._conversationId = input.conversationId;
+    agent._isTriggerChannel = false;
+
+    const result = await agent.invokeAgent(input);
+
+    // Send result back through channel
+    await channel.send({
+      output: result.output,
+      metadata: result.metadata,
+    });
+  });
+
+  channel.listen();
+
+  const addMockResponse = (response: MockResponse) => {
+    mockResponses.push(response);
+  };
+
+  return {
+    agent,
+    channel,
+    toolpack,
+    addMockResponse,
+  };
+}
+
+/**
+ * Creates a mock Toolpack instance for testing.
+ */
+function createMockToolpack(
+  mockResponses: MockResponse[],
+  defaultResponse: string,
+  defaultProvider = 'openai',
+  defaultModel?: string
+): Toolpack {
+  return {
+    generate: async (request: unknown, _providerOverride?: string) => {
+      const req = request as {
+        messages: Array<{ role: string; content: string }>;
+        model?: string;
+        tools?: unknown[];
+      };
+
+      // Get the last user message
+      const lastMessage = req.messages
+        .filter(m => m.role === 'user')
+        .pop();
+
+      const messageContent = lastMessage?.content ?? '';
+
+      // Find matching mock response
+      for (const mock of mockResponses) {
+        if (typeof mock.trigger === 'string') {
+          if (messageContent.toLowerCase().includes(mock.trigger.toLowerCase())) {
+            return {
+              content: mock.response,
+              usage: mock.usage ?? { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+            };
+          }
+        } else if (mock.trigger instanceof RegExp) {
+          if (mock.trigger.test(messageContent)) {
+            return {
+              content: mock.response,
+              usage: mock.usage ?? { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+            };
+          }
+        }
+      }
+
+      // Return default response
+      return {
+        content: defaultResponse,
+        usage: { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+      };
+    },
+    setMode: () => {
+      // No-op in tests
+    },
+    registerMode: () => {
+      // No-op in tests
+    },
+    // Add any other required Toolpack methods as no-ops or mocks
+    setProvider: () => {},
+    setModel: () => {},
+    // Provider and model getters
+    get provider() {
+      return defaultProvider;
+    },
+    get model() {
+      return defaultModel || 'gpt-4';
+    },
+  } as unknown as Toolpack;
+}
+
+/**
+ * Creates a minimal mock Toolpack for simple test cases.
+ * Returns the same response for all generate() calls.
+ *
+ * @example
+ * ```ts
+ * const toolpack = createMockToolpackSimple('Hello!');
+ * const agent = new MyAgent(toolpack);
+ * const result = await agent.run('Hi');
+ * expect(result.output).toBe('Hello!');
+ * ```
+ */
+export function createMockToolpackSimple(response = 'Mock AI response'): Toolpack {
+  return {
+    generate: async () => ({
+      content: response,
+      usage: { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+    }),
+    setMode: () => {},
+    registerMode: () => {},
+    setProvider: () => {},
+    setModel: () => {},
+  } as unknown as Toolpack;
+}
+
+/**
+ * Creates a mock Toolpack that returns different responses based on a sequence.
+ * Useful for testing multi-turn conversations or stateful interactions.
+ *
+ * @example
+ * ```ts
+ * const toolpack = createMockToolpackSequence([
+ *   'First response',
+ *   'Second response',
+ *   'Third response',
+ * ]);
+ *
+ * // First call returns 'First response', second call 'Second response', etc.
+ * ```
+ */
+export function createMockToolpackSequence(responses: string[]): Toolpack {
+  let callIndex = 0;
+
+  return {
+    generate: async () => {
+      const response = responses[callIndex] ?? 'No more mock responses';
+      callIndex++;
+      return {
+        content: response,
+        usage: { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+      };
+    },
+    setMode: () => {},
+    registerMode: () => {},
+    setProvider: () => {},
+    setModel: () => {},
+  } as unknown as Toolpack;
+}
diff --git a/packages/toolpack-agents/src/testing/index.test.ts b/packages/toolpack-agents/src/testing/index.test.ts
new file mode 100644
index 0000000..2a92ea4
--- /dev/null
+++ b/packages/toolpack-agents/src/testing/index.test.ts
@@ -0,0 +1,419 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { MockChannel } from './mock-channel.js';
+import { MockKnowledge, createMockKnowledge, createMockKnowledgeSync } from './mock-knowledge.js';
+import {
+  createTestAgent,
+  createMockToolpackSimple,
+  createMockToolpackSequence,
+} from './create-test-agent.js';
+import { captureEvents } from './capture-events.js';
+import { BaseAgent } from '../agent/base-agent.js';
+import type { AgentInput, AgentResult } from '../agent/types.js';
+import { CHAT_MODE } from 'toolpack-sdk';
+
+describe('testing utilities', () => {
+  describe('MockChannel', () => {
+    it('should capture outputs sent to the channel', async () => {
+      const channel = new MockChannel();
+
+      await channel.send({ output: 'Hello' });
+      await channel.send({ output: 'World' });
+
+      expect(channel.outputs).toHaveLength(2);
+      expect(channel.lastOutput?.output).toBe('World');
+    });
+
+    it('should normalize incoming messages', () => {
+      const channel = new MockChannel();
+
+      const input = channel.normalize({
+        message: 'Test message',
+        intent: 'test_intent',
+        conversationId: 'conv-123',
+        context: { threadTs: '123.456' },
+      });
+
+      expect(input.message).toBe('Test message');
+      expect(input.intent).toBe('test_intent');
+      expect(input.conversationId).toBe('conv-123');
+      expect(input.context).toEqual({ threadTs: '123.456' });
+    });
+
+    it('should call handler when receiving a message', async () => {
+      const channel = new MockChannel();
+      const handler = vi.fn().mockResolvedValue(undefined);
+
+      channel.onMessage(handler);
+      await channel.receive({ message: 'Test', conversationId: 'conv-1' });
+
+      expect(handler).toHaveBeenCalledOnce();
+      expect(handler.mock.calls[0][0].message).toBe('Test');
+    });
+
+    it('should track inputs received', async () => {
+      const channel = new MockChannel();
+      channel.onMessage(vi.fn().mockResolvedValue(undefined));
+
+      await channel.receive({ message: 'First', conversationId: 'conv-1' });
+      await channel.receive({ message: 'Second', conversationId: 'conv-1' });
+
+      expect(channel.inputs).toHaveLength(2);
+      expect(channel.lastInput?.message).toBe('Second');
+      expect(channel.receivedCount).toBe(2);
+    });
+
+    it('should clear all data', async () => {
+      const channel = new MockChannel();
+      await channel.send({ output: 'Test' });
+
+      channel.clear();
+
+      expect(channel.outputs).toHaveLength(0);
+      expect(channel.inputs).toHaveLength(0);
+    });
+
+    it('should throw if receiving without handler', async () => {
+      const channel = new MockChannel();
+
+      await expect(channel.receive({ message: 'Test' })).rejects.toThrow(
+        'no message handler registered'
+      );
+    });
+
+    it('should assert output contains text', async () => {
+      const channel = new MockChannel();
+      await channel.send({ output: 'Hello world!' });
+
+      channel.assertOutputContains('world');
+
+      expect(() => channel.assertOutputContains('missing')).toThrow('no output containing "missing"');
+    });
+
+    it('should assert last output', async () => {
+      const channel = new MockChannel();
+      await channel.send({ output: 'First' });
+      await channel.send({ output: 'Second' });
+
+      channel.assertLastOutput('Second');
+
+      expect(() => channel.assertLastOutput('Wrong')).toThrow('last output mismatch');
+    });
+
+    it('should handle isListening state', () => {
+      const channel = new MockChannel();
+
+      expect(channel.isListening).toBe(false);
+
+      channel.listen();
+      expect(channel.isListening).toBe(true);
+
+      channel.stop();
+      expect(channel.isListening).toBe(false);
+    });
+
+    it('should receive message with convenience method', async () => {
+      const channel = new MockChannel();
+      const handler = vi.fn().mockResolvedValue(undefined);
+      channel.onMessage(handler);
+
+      await channel.receiveMessage('Hello', 'conv-123', 'greet', { foo: 'bar' });
+
+      expect(handler).toHaveBeenCalledWith(
+        expect.objectContaining({
+          message: 'Hello',
+          conversationId: 'conv-123',
+          intent: 'greet',
+          context: { foo: 'bar' },
+        })
+      );
+    });
+  });
+
+  describe('MockKnowledge', () => {
+    it('should create async knowledge with initial chunks', async () => {
+      const knowledge = await createMockKnowledge({
+        initialChunks: [
+          { content: 'Test content here', metadata: { source: 'test' } },
+        ],
+      });
+
+      // Query with same text to match via vector similarity
+      const results = await knowledge.query('Test content here');
+      expect(results.length).toBeGreaterThan(0);
+      expect(results[0].chunk.content).toBe('Test content here');
+    });
+
+    it('should query with keyword matching', async () => {
+      const knowledge = createMockKnowledgeSync({
+        initialChunks: [
+          { content: 'Apple is a fruit', metadata: { category: 'fruit' } },
+          { content: 'Banana is yellow', metadata: { category: 'fruit' } },
+          { content: 'Carrot is orange', metadata: { category: 'vegetable' } },
+        ],
+      });
+
+      const results = await knowledge.query('apple');
+
+      expect(results).toHaveLength(1);
+      expect(results[0].chunk.content).toBe('Apple is a fruit');
+      expect(results[0].score).toBeGreaterThan(0);
+    });
+
+    it('should add content', async () => {
+      const knowledge = createMockKnowledgeSync();
+
+      const id = await knowledge.add('New content', { source: 'test' });
+
+      expect(id).toBeDefined();
+      expect(knowledge.getAllChunks()).toHaveLength(1);
+
+      const results = await knowledge.query('New');
+      expect(results).toHaveLength(1);
+    });
+
+    it('should filter by metadata', async () => {
+      const knowledge = createMockKnowledgeSync({
+        initialChunks: [
+          { content: 'Apple fruit', metadata: { category: 'fruit' } },
+          { content: 'Carrot vegetable', metadata: { category: 'vegetable' } },
+        ],
+      });
+
+      const results = await knowledge.query('fruit', { filter: { category: 'fruit' } });
+
+      expect(results).toHaveLength(1);
+      expect(results[0].chunk.content).toBe('Apple fruit');
+    });
+
+    it('should clear all chunks', async () => {
+      const knowledge = createMockKnowledgeSync({
+        initialChunks: [{ content: 'Test' }],
+      });
+
+      knowledge.clear();
+
+      expect(knowledge.getAllChunks()).toHaveLength(0);
+    });
+
+    it('should convert to tool', async () => {
+      const knowledge = createMockKnowledgeSync({
+        initialChunks: [{ content: 'Test info' }],
+      });
+
+      const tool = knowledge.toTool();
+
+      expect(tool.name).toBe('knowledge_search');
+      expect(tool.description).toBeDefined();
+      expect(tool.parameters).toBeDefined();
+
+      const results = await tool.execute({ query: 'info' });
+      expect(results).toHaveLength(1);
+      expect(results[0].content).toBe('Test info');
+    });
+
+    it('should respect limit option', async () => {
+      const knowledge = createMockKnowledgeSync({
+        initialChunks: [
+          { content: 'One number' },
+          { content: 'Two number' },
+          { content: 'Three number' },
+        ],
+      });
+
+      const results = await knowledge.query('number', { limit: 2 });
+
+      expect(results).toHaveLength(2);
+    });
+  });
+
+  describe('createTestAgent', () => {
+    class TestAgent extends BaseAgent {
+      name = 'test-agent';
+      description = 'A test agent';
+      mode = CHAT_MODE;
+
+      async invokeAgent(input: AgentInput): Promise<AgentResult> {
+        const result = await this.run(input.message || '');
+        return result;
+      }
+    }
+
+    it('should create agent with mock channel', async () => {
+      const { agent, channel } = createTestAgent(TestAgent);
+
+      expect(agent).toBeInstanceOf(TestAgent);
+      expect(channel).toBeInstanceOf(MockChannel);
+      expect(agent.name).toBe('test-agent');
+    });
+
+    it('should route messages through channel to agent', async () => {
+      const { channel } = createTestAgent(TestAgent, {
+        mockResponses: [{ trigger: 'hello', response: 'Hi there!' }],
+      });
+
+      await channel.receiveMessage('hello', 'conv-1');
+
+      expect(channel.lastOutput?.output).toBe('Hi there!');
+    });
+
+    it('should return default response when no trigger matches', async () => {
+      const { channel } = createTestAgent(TestAgent, {
+        defaultResponse: 'Default answer',
+      });
+
+      await channel.receiveMessage('unknown query', 'conv-1');
+
+      expect(channel.lastOutput?.output).toBe('Default answer');
+    });
+
+    it('should add more mock responses', async () => {
+      const { channel, addMockResponse } = createTestAgent(TestAgent);
+
+      addMockResponse({ trigger: 'new', response: 'New response' });
+
+      await channel.receiveMessage('new', 'conv-1');
+
+      expect(channel.lastOutput?.output).toBe('New response');
+    });
+
+    it('should support regex triggers', async () => {
+      const { channel } = createTestAgent(TestAgent, {
+        mockResponses: [{ trigger: /\d+/, response: 'Number detected' }],
+      });
+
+      await channel.receiveMessage('The answer is 42', 'conv-1');
+
+      expect(channel.lastOutput?.output).toBe('Number detected');
+    });
+  });
+
+  describe('createMockToolpackSimple', () => {
+    it('should return same response for all calls', async () => {
+      const toolpack = createMockToolpackSimple('Always this');
+
+      const result1 = await toolpack.generate({ messages: [{ role: 'user', content: 'Q1' }], model: 'gpt-4' });
+      const result2 = await toolpack.generate({ messages: [{ role: 'user', content: 'Q2' }], model: 'gpt-4' });
+
+      expect(result1.content).toBe('Always this');
+      expect(result2.content).toBe('Always this');
+    });
+  });
+
+  describe('createMockToolpackSequence', () => {
+    it('should return responses in sequence', async () => {
+      const toolpack = createMockToolpackSequence(['First', 'Second', 'Third']);
+
+      const result1 = await toolpack.generate({ messages: [], model: 'gpt-4' });
+      const result2 = await toolpack.generate({ messages: [], model: 'gpt-4' });
+      const result3 = await toolpack.generate({ messages: [], model: 'gpt-4' });
+      const result4 = await toolpack.generate({ messages: [], model: 'gpt-4' });
+
+      expect(result1.content).toBe('First');
+      expect(result2.content).toBe('Second');
+      expect(result3.content).toBe('Third');
+      expect(result4.content).toBe('No more mock responses');
+    });
+  });
+
+  describe('captureEvents', () => {
+    class EventfulAgent extends BaseAgent {
+      name = 'eventful-agent';
+      description = 'An agent that emits events';
+      mode = CHAT_MODE;
+
+      async invokeAgent(input: AgentInput): Promise<AgentResult> {
+        this.emit('agent:start', { message: input.message });
+        this.emit('agent:complete', { output: 'Done' });
+        return { output: 'Done' };
+      }
+    }
+
+    it('should capture agent events', async () => {
+      const toolpack = createMockToolpackSimple();
+      const agent = new EventfulAgent({ toolpack });
+      const capture = captureEvents(agent);
+
+      await agent.invokeAgent({ message: 'Test' });
+
+      expect(capture.hasEvent('agent:start')).toBe(true);
+      expect(capture.hasEvent('agent:complete')).toBe(true);
+      expect(capture.count).toBe(2);
+    });
+
+    it('should get events by name', async () => {
+      const toolpack = createMockToolpackSimple();
+      const agent = new EventfulAgent({ toolpack });
+      const capture = captureEvents(agent);
+
+      await agent.invokeAgent({ message: 'Test' });
+
+      const startEvents = capture.getEvents('agent:start');
+      expect(startEvents).toHaveLength(1);
+      expect(startEvents[0].name).toBe('agent:start');
+    });
+
+    it('should get first and last events', async () => {
+      const toolpack = createMockToolpackSimple();
+      const agent = new EventfulAgent({ toolpack });
+      const capture = captureEvents(agent);
+
+      await agent.invokeAgent({ message: 'Test' });
+
+      expect(capture.getFirstEvent('agent:start')).toBeDefined();
+      expect(capture.getLastEvent('agent:complete')).toBeDefined();
+    });
+
+    it('should clear events', async () => {
+      const toolpack = createMockToolpackSimple();
+      const agent = new EventfulAgent({ toolpack });
+      const capture = captureEvents(agent);
+
+      await agent.invokeAgent({ message: 'Test' });
+      capture.clear();
+
+      expect(capture.count).toBe(0);
+      expect(capture.hasEvent('agent:start')).toBe(false);
+    });
+
+    it('should assert event presence', async () => {
+      const toolpack = createMockToolpackSimple();
+      const agent = new EventfulAgent({ toolpack });
+      const capture = captureEvents(agent);
+
+      await agent.invokeAgent({ message: 'Test' });
+
+      capture.assertEvent('agent:start');
+      capture.assertEvent('agent:complete');
+
+      expect(() => capture.assertEvent('agent:error')).toThrow(
+        'expected event "agent:error" was not captured'
+      );
+    });
+
+    it('should assert event absence', async () => {
+      const toolpack = createMockToolpackSimple();
+      const agent = new EventfulAgent({ toolpack });
+      const capture = captureEvents(agent);
+
+      await agent.invokeAgent({ message: 'Test' });
+
+      capture.assertNoEvent('agent:error');
+
+      expect(() => capture.assertNoEvent('agent:start')).toThrow(
+        'unexpected event "agent:start" was captured'
+      );
+    });
+
+    it('should stop capturing and remove listeners', async () => {
+      const toolpack = createMockToolpackSimple();
+      const agent = new EventfulAgent({ toolpack });
+      const capture = captureEvents(agent);
+
+      capture.stop();
+      await agent.invokeAgent({ message: 'Test' });
+
+      // Events were emitted but capture was stopped
+      expect(capture.count).toBe(0);
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/testing/index.ts b/packages/toolpack-agents/src/testing/index.ts
new file mode 100644
index 0000000..ca66673
--- /dev/null
+++ b/packages/toolpack-agents/src/testing/index.ts
@@ -0,0 +1,29 @@
+// Testing utilities for toolpack-agents
+// Provides mocks, helpers, and utilities for testing agents in isolation
+
+// Mock Channel
+export { MockChannel } from './mock-channel.js';
+
+// Mock Knowledge
+export { createMockKnowledge, createMockKnowledgeSync, MockKnowledge } from './mock-knowledge.js';
+export type { MockKnowledgeOptions } from './mock-knowledge.js';
+
+// Test Agent Factory
+export {
+  createTestAgent,
+  createMockToolpackSimple,
+  createMockToolpackSequence,
+} from './create-test-agent.js';
+export type {
+  MockResponse,
+  CreateTestAgentOptions,
+  TestAgentResult,
+} from './create-test-agent.js';
+
+// Event Capture
+export { captureEvents, registerEventMatchers } from './capture-events.js';
+export type {
+  AgentEventName,
+  CapturedEvent,
+  EventCapture,
+} from './capture-events.js';
diff --git a/packages/toolpack-agents/src/testing/mock-channel.ts b/packages/toolpack-agents/src/testing/mock-channel.ts
new file mode 100644
index 0000000..dd9ea08
--- /dev/null
+++ b/packages/toolpack-agents/src/testing/mock-channel.ts
@@ -0,0 +1,201 @@
+import { AgentInput, AgentOutput, ChannelInterface } from '../agent/types.js';
+
+/**
+ * Mock channel for testing agents without external integrations.
+ * Simulates a channel that can receive messages and capture outputs.
+ *
+ * @example
+ * ```ts
+ * const mockChannel = new MockChannel();
+ *
+ * // Simulate an incoming message
+ * await mockChannel.receive({
+ *   message: 'Analyse this week\'s leads',
+ *   intent: 'morning_analysis',
+ *   conversationId: 'test-thread-1',
+ * });
+ *
+ * // Assert what the agent sent back
+ * expect(mockChannel.lastOutput?.output).toContain('leads');
+ * expect(mockChannel.outputs).toHaveLength(1);
+ * ```
+ */
+export class MockChannel implements ChannelInterface {
+  name = 'mock-channel';
+  isTriggerChannel = false;
+
+  private _handler?: (input: AgentInput) => Promise<void>;
+  private _outputs: AgentOutput[] = [];
+  private _inputs: AgentInput[] = [];
+  private _listening = false;
+
+  /**
+   * All outputs sent to this channel.
+   */
+  get outputs(): AgentOutput[] {
+    return [...this._outputs];
+  }
+
+  /**
+   * The most recent output sent to this channel, or undefined if none.
+   */
+  get lastOutput(): AgentOutput | undefined {
+    return this._outputs[this._outputs.length - 1];
+  }
+
+  /**
+   * All inputs received by this channel.
+   */
+  get inputs(): AgentInput[] {
+    return [...this._inputs];
+  }
+
+  /**
+   * The most recent input received by this channel, or undefined if none.
+   */
+  get lastInput(): AgentInput | undefined {
+    return this._inputs[this._inputs.length - 1];
+  }
+
+  /**
+   * Number of messages received.
+   */
+  get receivedCount(): number {
+    return this._inputs.length;
+  }
+
+  /**
+   * Number of outputs sent.
+   */
+  get sentCount(): number {
+    return this._outputs.length;
+  }
+
+  /**
+   * Whether the channel is currently "listening".
+   */
+  get isListening(): boolean {
+    return this._listening;
+  }
+
+  /**
+   * Set the message handler. Called by AgentRegistry.
+   */
+  onMessage(handler: (input: AgentInput) => Promise<void>): void {
+    this._handler = handler;
+  }
+
+  /**
+   * Start listening. Called by AgentRegistry.
+   * For MockChannel, this just sets a flag.
+   */
+  listen(): void {
+    this._listening = true;
+  }
+
+  /**
+   * Stop listening.
+   */
+  stop(): void {
+    this._listening = false;
+  }
+
+  /**
+   * Send output to this channel.
+   * Captures the output for later assertions.
+   */
+  async send(output: AgentOutput): Promise<void> {
+    this._outputs.push(output);
+  }
+
+  /**
+   * Normalize an incoming event into AgentInput.
+   */
+  normalize(incoming: unknown): AgentInput {
+    const data = incoming as Record<string, unknown>;
+    return {
+      intent: data.intent as string | undefined,
+      message: data.message as string | undefined,
+      data: data.data,
+      context: (data.context as Record<string, unknown>) || {},
+      conversationId: (data.conversationId as string) || 'test-conversation-1',
+    };
+  }
+
+  /**
+   * Simulate receiving a message on this channel.
+   * Normalizes the input and invokes the registered handler.
+   *
+   * @param incoming The raw incoming message data
+   * @returns A promise that resolves when the handler completes
+   * @throws If no handler is registered (channel not wired to agent)
+   */
+  async receive(incoming: unknown): Promise<void> {
+    if (!this._handler) {
+      throw new Error('MockChannel: no message handler registered. Call onMessage() first or ensure channel is registered with AgentRegistry.');
+    }
+
+    const input = this.normalize(incoming);
+    this._inputs.push(input);
+    await this._handler(input);
+  }
+
+  /**
+   * Simulate receiving a message with a specific conversation ID.
+   *
+   * @param message The message text
+   * @param conversationId The conversation ID
+   * @param intent Optional intent
+   * @param context Optional context
+   */
+  async receiveMessage(
+    message: string,
+    conversationId = 'test-conversation-1',
+    intent?: string,
+    context?: Record<string, unknown>
+  ): Promise<void> {
+    await this.receive({
+      message,
+      conversationId,
+      intent,
+      context,
+    });
+  }
+
+  /**
+   * Clear all captured inputs and outputs.
+   */
+  clear(): void {
+    this._inputs = [];
+    this._outputs = [];
+  }
+
+  /**
+   * Assert that an output containing the given text was sent.
+   *
+   * @param text The text to search for
+   * @throws If no matching output is found
+   */
+  assertOutputContains(text: string): void {
+    const found = this._outputs.some(o => o.output.includes(text));
+    if (!found) {
+      throw new Error(`MockChannel: no output containing "${text}" found. Outputs: ${JSON.stringify(this._outputs.map(o => o.output))}`);
+    }
+  }
+
+  /**
+   * Assert that the last output matches the expected text.
+   *
+   * @param expected The expected text
+   * @throws If the last output doesn't match
+   */
+  assertLastOutput(expected: string): void {
+    const last = this.lastOutput;
+    if (!last) {
+      throw new Error(`MockChannel: no output sent. Expected: "${expected}"`);
+    }
+    if (last.output !== expected) {
+      throw new Error(`MockChannel: last output mismatch.\nExpected: "${expected}"\nActual: "${last.output}"`);
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/testing/mock-knowledge.ts b/packages/toolpack-agents/src/testing/mock-knowledge.ts
new file mode 100644
index 0000000..21acdc1
--- /dev/null
+++ b/packages/toolpack-agents/src/testing/mock-knowledge.ts
@@ -0,0 +1,291 @@
+import type { Knowledge } from '@toolpack-sdk/knowledge';
+import type { Chunk, Embedder, QueryOptions, QueryResult } from '@toolpack-sdk/knowledge';
+
+/**
+ * Options for creating mock knowledge.
+ */
+export interface MockKnowledgeOptions {
+  /** Initial chunks to populate the knowledge base */
+  initialChunks?: Array<{
+    content: string;
+    metadata?: Record<string, unknown>;
+  }>;
+  /** Dimensions for the mock embedder (default: 384) */
+  dimensions?: number;
+  /** Description for the knowledge tool */
+  description?: string;
+}
+
+/**
+ * Creates an in-memory mock Knowledge instance for testing.
+ * No embedder, no provider needed — everything is in-memory.
+ *
+ * @example
+ * ```ts
+ * const knowledge = await createMockKnowledge({
+ *   initialChunks: [
+ *     { content: 'Lead: Acme Corp, score: 85', metadata: { source: 'crm' } },
+ *   ],
+ * });
+ *
+ * // Use with SDK
+ * const toolpack = await Toolpack.init({
+ *   provider: 'openai',
+ *   knowledge, // Available to all agents
+ * });
+ * ```
+ */
+export async function createMockKnowledge(
+  options: MockKnowledgeOptions = {}
+): Promise<Knowledge> {
+  const { Knowledge } = await import('@toolpack-sdk/knowledge');
+  const { MemoryProvider } = await import('@toolpack-sdk/knowledge');
+
+  const dimensions = options.dimensions ?? 384;
+
+  // Create a mock embedder that generates pseudo-random vectors
+  const mockEmbedder: Embedder = {
+    dimensions,
+    async embed(text: string): Promise<number[]> {
+      // Generate a deterministic "random" vector based on the text
+      const vector: number[] = [];
+      let seed = 0;
+      for (let i = 0; i < text.length; i++) {
+        seed = (seed + text.charCodeAt(i)) % 1000;
+      }
+      for (let i = 0; i < dimensions; i++) {
+        // Simple pseudo-random based on seed and position
+        const val = Math.sin(seed * (i + 1)) * 0.5 + 0.5;
+        vector.push(val);
+      }
+      return vector;
+    },
+    async embedBatch(texts: string[]): Promise<number[][]> {
+      return Promise.all(texts.map(t => this.embed(t)));
+    },
+  };
+
+  const provider = new MemoryProvider();
+  await provider.validateDimensions(dimensions);
+
+  // Add initial chunks if provided
+  if (options.initialChunks && options.initialChunks.length > 0) {
+    const chunks: Chunk[] = [];
+    for (const item of options.initialChunks) {
+      const vector = await mockEmbedder.embed(item.content);
+      chunks.push({
+        id: `mock-${Date.now()}-${Math.random().toString(36).slice(2)}`,
+        content: item.content,
+        metadata: item.metadata || {},
+        vector,
+      });
+    }
+    await provider.add(chunks);
+  }
+
+  return Knowledge.create({
+    provider,
+    embedder: mockEmbedder,
+    sources: [],
+    description: options.description ?? 'Mock knowledge base for testing',
+    reSync: false,
+  });
+}
+
+/**
+ * Synchronous version of createMockKnowledge for simple test cases.
+ * Returns a mock knowledge-like object that's not a full Knowledge instance
+ * but implements the key methods needed for testing.
+ *
+ * This is useful when you don't want to deal with async setup in tests.
+ */
+export function createMockKnowledgeSync(
+  options: MockKnowledgeOptions = {}
+): MockKnowledge {
+  const dimensions = options.dimensions ?? 384;
+  const chunks: Chunk[] = [];
+
+  // Generate deterministic vector
+  const generateVector = (text: string): number[] => {
+    const vector: number[] = [];
+    let seed = 0;
+    for (let i = 0; i < text.length; i++) {
+      seed = (seed + text.charCodeAt(i)) % 1000;
+    }
+    for (let i = 0; i < dimensions; i++) {
+      const val = Math.sin(seed * (i + 1)) * 0.5 + 0.5;
+      vector.push(val);
+    }
+    return vector;
+  };
+
+  // Add initial chunks
+  if (options.initialChunks) {
+    for (const item of options.initialChunks) {
+      chunks.push({
+        id: `mock-${Date.now()}-${Math.random().toString(36).slice(2)}`,
+        content: item.content,
+        metadata: item.metadata || {},
+        vector: generateVector(item.content),
+      });
+    }
+  }
+
+  return new MockKnowledge(chunks, generateVector, options.description);
+}
+
+/**
+ * A simplified mock Knowledge for synchronous test setup.
+ * Implements the key methods that agents use: query() and add()
+ */
+export class MockKnowledge {
+  private chunks: Chunk[];
+  private generateVector: (text: string) => number[];
+  private _description: string;
+
+  constructor(
+    initialChunks: Chunk[] = [],
+    generateVector: (text: string) => number[],
+    description = 'Mock knowledge base'
+  ) {
+    this.chunks = [...initialChunks];
+    this.generateVector = generateVector;
+    this._description = description;
+  }
+
+  /**
+   * Query the mock knowledge base using simple keyword matching.
+   * This doesn't do real semantic search but is sufficient for most tests.
+   */
+  async query(text: string, options?: QueryOptions): Promise<QueryResult[]> {
+    const limit = options?.limit ?? 10;
+    const filter = options?.filter;
+
+    // Simple keyword matching
+    const keywords = text.toLowerCase().split(/\s+/);
+
+    const results = this.chunks
+      .filter(chunk => {
+        // Apply metadata filter if provided
+        if (filter) {
+          for (const [key, value] of Object.entries(filter)) {
+            if (chunk.metadata[key] !== value) {
+              return false;
+            }
+          }
+        }
+        return true;
+      })
+      .map(chunk => {
+        const chunkText = chunk.content.toLowerCase();
+        // Score based on keyword matches
+        let score = 0;
+        for (const keyword of keywords) {
+          if (chunkText.includes(keyword)) {
+            score += 0.3;
+            // Bonus for exact word match
+            if (new RegExp(`\\b${keyword}\\b`).test(chunkText)) {
+              score += 0.2;
+            }
+          }
+        }
+        // Cap at 1.0
+        score = Math.min(score, 1);
+
+        return {
+          chunk: {
+            id: chunk.id,
+            content: chunk.content,
+            metadata: options?.includeMetadata === false ? {} : chunk.metadata,
+            vector: options?.includeVectors ? chunk.vector : undefined,
+          },
+          score,
+          distance: 1 - score,
+        };
+      })
+      .filter(r => r.score > 0)
+      .sort((a, b) => b.score - a.score)
+      .slice(0, limit);
+
+    return results;
+  }
+
+  /**
+   * Add content to the mock knowledge base.
+   */
+  async add(content: string, metadata?: Record<string, unknown>): Promise<string> {
+    const id = `mock-${Date.now()}-${Math.random().toString(36).slice(2)}`;
+    this.chunks.push({
+      id,
+      content,
+      metadata: metadata || {},
+      vector: this.generateVector(content),
+    });
+    return id;
+  }
+
+  /**
+   * Get all chunks in the knowledge base.
+   */
+  getAllChunks(): Chunk[] {
+    return [...this.chunks];
+  }
+
+  /**
+   * Clear all chunks.
+   */
+  clear(): void {
+    this.chunks = [];
+  }
+
+  /**
+   * Convert to a tool format for use with agents.
+   */
+  toTool(): {
+    name: string;
+    displayName: string;
+    description: string;
+    category: string;
+    cacheable: boolean;
+    parameters: {
+      type: string;
+      properties: Record<string, unknown>;
+      required: string[];
+    };
+    execute: (params: {
+      query: string;
+      limit?: number;
+      threshold?: number;
+      filter?: Record<string, unknown>;
+    }) => Promise<Array<{ content: string; score: number; metadata: Record<string, unknown> }>>;
+  } {
+    return {
+      name: 'knowledge_search',
+      displayName: 'Knowledge Search',
+      description: this._description,
+      category: 'search',
+      cacheable: false,
+      parameters: {
+        type: 'object',
+        properties: {
+          query: { type: 'string', description: 'Search query to find relevant information' },
+          limit: { type: 'number', description: 'Maximum number of results to return (default: 10)' },
+          threshold: { type: 'number', description: 'Minimum similarity threshold 0-1 (default: 0.7)' },
+          filter: { type: 'object', description: 'Optional metadata filters' },
+        },
+        required: ['query'],
+      },
+      execute: async (params) => {
+        const results = await this.query(params.query, {
+          limit: params.limit,
+          filter: params.filter as QueryOptions['filter'],
+        });
+        return results.map(r => ({
+          content: r.chunk.content,
+          score: r.score,
+          metadata: r.chunk.metadata,
+        }));
+      },
+    };
+  }
+}
diff --git a/packages/toolpack-agents/src/transport/delegation.test.ts b/packages/toolpack-agents/src/transport/delegation.test.ts
new file mode 100644
index 0000000..0cd8932
--- /dev/null
+++ b/packages/toolpack-agents/src/transport/delegation.test.ts
@@ -0,0 +1,362 @@
+import { describe, it, expect, beforeEach, afterEach, vi } from 'vitest';
+import { BaseAgent } from '../agent/base-agent.js';
+import { AgentRegistry } from '../agent/agent-registry.js';
+import { LocalTransport } from './local-transport.js';
+import { JsonRpcTransport } from './jsonrpc-transport.js';
+import { AgentJsonRpcServer } from './jsonrpc-server.js';
+import type { AgentInput, AgentResult, BaseAgentOptions } from '../agent/types.js';
+import type { Toolpack } from 'toolpack-sdk';
+import { CHAT_MODE, CODING_MODE } from 'toolpack-sdk';
+
+// Mock Toolpack
+const createMockToolpack = (): Toolpack => ({
+  generate: vi.fn().mockResolvedValue({ content: 'Mock response' }),
+  setMode: vi.fn(),
+  registerMode: vi.fn(),
+} as unknown as Toolpack);
+
+// Test agents
+class DataAgent extends BaseAgent {
+  name = 'data-agent';
+  description = 'Generates data reports';
+  mode = CODING_MODE;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    return {
+      output: `Data report for: ${input.message}`,
+      metadata: { delegatedBy: input.context?.delegatedBy },
+    };
+  }
+}
+
+class EmailAgent extends BaseAgent {
+  name = 'email-agent';
+  description = 'Sends emails';
+  mode = CHAT_MODE;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    // Test delegation
+    if (input.message?.includes('with report')) {
+      const report = await this.delegateAndWait('data-agent', {
+        message: 'Generate weekly report',
+        intent: 'generate_report',
+      });
+      return {
+        output: `Email sent with: ${report.output}`,
+      };
+    }
+
+    return {
+      output: `Email sent: ${input.message}`,
+    };
+  }
+}
+
+class CoordinatorAgent extends BaseAgent {
+  name = 'coordinator';
+  description = 'Coordinates other agents';
+  mode = CHAT_MODE;
+
+  constructor(options: BaseAgentOptions) {
+    super(options);
+  }
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    // Fire-and-forget delegation
+    await this.delegate('data-agent', {
+      message: 'Background task',
+    });
+
+    return {
+      output: 'Coordinator task complete',
+    };
+  }
+}
+
+describe('Agent Delegation', () => {
+  describe('LocalTransport (same process)', () => {
+    let toolpack: Toolpack;
+    let registry: AgentRegistry;
+
+    beforeEach(async () => {
+      toolpack = createMockToolpack();
+      const dataAgent = new DataAgent({ toolpack });
+      const emailAgent = new EmailAgent({ toolpack });
+      const coordinatorAgent = new CoordinatorAgent({ toolpack });
+      registry = new AgentRegistry([dataAgent, emailAgent, coordinatorAgent]);
+      await registry.start();
+    });
+
+    it('should delegate to another agent and wait for result', async () => {
+      const emailAgent = registry.getAgent('email-agent');
+      expect(emailAgent).toBeDefined();
+
+      const result = await emailAgent!.invokeAgent({
+        message: 'Send email with report',
+        conversationId: 'test-1',
+      });
+
+      expect(result.output).toContain('Email sent with:');
+      expect(result.output).toContain('Data report for: Generate weekly report');
+    });
+
+    it('should include delegatedBy in context', async () => {
+      const emailAgent = registry.getAgent('email-agent');
+
+      // Manually test delegation with context
+      const result = await (emailAgent as any).delegateAndWait('data-agent', {
+        message: 'Generate report',
+      });
+
+      expect(result.metadata?.delegatedBy).toBe('email-agent');
+    });
+
+    it('should support fire-and-forget delegation', async () => {
+      const coordinator = registry.getAgent('coordinator');
+      const result = await coordinator!.invokeAgent({
+        message: 'Start coordination',
+        conversationId: 'test-3',
+      });
+
+      expect(result.output).toBe('Coordinator task complete');
+    });
+
+    it('should throw error if agent not found', async () => {
+      const transport = new LocalTransport(registry);
+
+      await expect(
+        transport.invoke('non-existent-agent', {
+          message: 'test',
+          conversationId: 'test-4',
+        })
+      ).rejects.toThrow('Agent "non-existent-agent" not found');
+    });
+
+    it('should throw error if registry not set', async () => {
+      const agent = new DataAgent({ toolpack });
+      // Don't register with registry
+
+      await expect(
+        (agent as any).delegateAndWait('email-agent', { message: 'test' })
+      ).rejects.toThrow('Agent not registered');
+    });
+  });
+
+  describe('JsonRpcTransport (cross-process)', () => {
+    let server: AgentJsonRpcServer;
+    let toolpack: Toolpack;
+    const SERVER_PORT = 3456;
+
+    beforeEach(async () => {
+      toolpack = createMockToolpack();
+
+      // Start JSON-RPC server with agents
+      server = new AgentJsonRpcServer({ port: SERVER_PORT });
+      server.registerAgent('data-agent', new DataAgent({ toolpack }));
+      server.listen();
+
+      // Wait for server to start
+      await new Promise(resolve => setTimeout(resolve, 100));
+    });
+
+    afterEach(async () => {
+      await server.stop();
+    });
+
+    it('should invoke remote agent via JSON-RPC', async () => {
+      const transport = new JsonRpcTransport({
+        agents: {
+          'data-agent': `http://localhost:${SERVER_PORT}`,
+        },
+      });
+
+      const result = await transport.invoke('data-agent', {
+        message: 'Generate report',
+        conversationId: 'test-rpc-1',
+      });
+
+      expect(result.output).toBe('Data report for: Generate report');
+    });
+
+    it('should work with AgentRegistry using JsonRpcTransport', async () => {
+      const transport = new JsonRpcTransport({
+        agents: {
+          'data-agent': `http://localhost:${SERVER_PORT}`,
+        },
+      });
+
+      const emailAgent = new EmailAgent({ toolpack });
+      const registry = new AgentRegistry([emailAgent], { transport });
+      await registry.start();
+
+      const retrievedEmailAgent = registry.getAgent('email-agent');
+      const result = await retrievedEmailAgent!.invokeAgent({
+        message: 'Send email with report',
+        conversationId: 'test-rpc-2',
+      });
+
+      expect(result.output).toContain('Email sent with:');
+      expect(result.output).toContain('Data report for:');
+    });
+
+    it('should throw error if agent not in transport config', async () => {
+      const transport = new JsonRpcTransport({
+        agents: {
+          'data-agent': `http://localhost:${SERVER_PORT}`,
+        },
+      });
+
+      await expect(
+        transport.invoke('non-existent-agent', {
+          message: 'test',
+          conversationId: 'test-rpc-3',
+        })
+      ).rejects.toThrow('Agent "non-existent-agent" not found in transport configuration');
+    });
+
+    it('should throw error if server returns error', async () => {
+      const transport = new JsonRpcTransport({
+        agents: {
+          'unknown-agent': `http://localhost:${SERVER_PORT}`,
+        },
+      });
+
+      await expect(
+        transport.invoke('unknown-agent', {
+          message: 'test',
+          conversationId: 'test-rpc-4',
+        })
+      ).rejects.toThrow('JSON-RPC error');
+    });
+
+    it('should throw error if server is unreachable', async () => {
+      const transport = new JsonRpcTransport({
+        agents: {
+          'data-agent': 'http://localhost:9999', // Wrong port
+        },
+      });
+
+      await expect(
+        transport.invoke('data-agent', {
+          message: 'test',
+          conversationId: 'test-rpc-5',
+        })
+      ).rejects.toThrow('Failed to invoke agent');
+    });
+  });
+
+  describe('Hybrid (Local + Remote)', () => {
+    let server: AgentJsonRpcServer;
+    let toolpack: Toolpack;
+    const SERVER_PORT = 3457;
+
+    beforeEach(async () => {
+      toolpack = createMockToolpack();
+
+      // Start JSON-RPC server with DataAgent
+      server = new AgentJsonRpcServer({ port: SERVER_PORT });
+      server.registerAgent('data-agent', new DataAgent({ toolpack }));
+      server.listen();
+
+      await new Promise(resolve => setTimeout(resolve, 100));
+    });
+
+    afterEach(async () => {
+      await server.stop();
+    });
+
+    it('should support hybrid local and remote agents', async () => {
+      // EmailAgent is local, DataAgent is remote
+      const transport = new JsonRpcTransport({
+        agents: {
+          'data-agent': `http://localhost:${SERVER_PORT}`,
+        },
+      });
+
+      const emailAgent = new EmailAgent({ toolpack });
+      const registry = new AgentRegistry([emailAgent], { transport });
+      await registry.start();
+
+      const retrievedEmailAgent = registry.getAgent('email-agent');
+      const result = await retrievedEmailAgent!.invokeAgent({
+        message: 'Send email with report',
+        conversationId: 'test-hybrid-1',
+      });
+
+      expect(result.output).toContain('Email sent with:');
+      expect(result.output).toContain('Data report for:');
+    });
+  });
+
+  describe('JSON-RPC Server', () => {
+    let server: AgentJsonRpcServer;
+    let toolpack: Toolpack;
+    const SERVER_PORT = 3458;
+
+    beforeEach(() => {
+      toolpack = createMockToolpack();
+      server = new AgentJsonRpcServer({ port: SERVER_PORT });
+    });
+
+    afterEach(async () => {
+      await server.stop();
+    });
+
+    it('should register multiple agents', () => {
+      server.registerAgent('data-agent', new DataAgent({ toolpack }));
+      server.registerAgent('email-agent', new EmailAgent({ toolpack }));
+
+      expect((server as any).agents.size).toBe(2);
+    });
+
+    it('should handle invalid JSON-RPC requests', async () => {
+      server.registerAgent('data-agent', new DataAgent({ toolpack }));
+      server.listen();
+      await new Promise(resolve => setTimeout(resolve, 100));
+
+      const response = await fetch(`http://localhost:${SERVER_PORT}`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          jsonrpc: '1.0', // Wrong version
+          method: 'agent.invoke:data-agent',
+          params: { message: 'test' },
+          id: 1,
+        }),
+      });
+
+      const result = await response.json();
+      expect(result.error).toBeDefined();
+      expect(result.error.message).toContain('Invalid Request');
+    });
+
+    it('should handle unknown methods', async () => {
+      server.registerAgent('data-agent', new DataAgent({ toolpack }));
+      server.listen();
+      await new Promise(resolve => setTimeout(resolve, 100));
+
+      const response = await fetch(`http://localhost:${SERVER_PORT}`, {
+        method: 'POST',
+        headers: { 'Content-Type': 'application/json' },
+        body: JSON.stringify({
+          jsonrpc: '2.0',
+          method: 'unknown.method',
+          params: { message: 'test' },
+          id: 1,
+        }),
+      });
+
+      const result = await response.json();
+      expect(result.error).toBeDefined();
+      expect(result.error.message).toContain('Method not found');
+    });
+  });
+});
diff --git a/packages/toolpack-agents/src/transport/index.ts b/packages/toolpack-agents/src/transport/index.ts
new file mode 100644
index 0000000..09ccbf2
--- /dev/null
+++ b/packages/toolpack-agents/src/transport/index.ts
@@ -0,0 +1,11 @@
+// Transport layer for agent-to-agent communication
+
+// Types
+export type { AgentTransport, AgentRegistryTransportOptions } from './types.js';
+
+// Local transport (same process)
+export { LocalTransport } from './local-transport.js';
+
+// JSON-RPC transport (cross-process)
+export { JsonRpcTransport } from './jsonrpc-transport.js';
+export { AgentJsonRpcServer } from './jsonrpc-server.js';
diff --git a/packages/toolpack-agents/src/transport/jsonrpc-server.ts b/packages/toolpack-agents/src/transport/jsonrpc-server.ts
new file mode 100644
index 0000000..5ec09dc
--- /dev/null
+++ b/packages/toolpack-agents/src/transport/jsonrpc-server.ts
@@ -0,0 +1,214 @@
+import http from 'http';
+import type { BaseAgent } from '../agent/base-agent.js';
+import type { AgentInput, AgentResult } from '../agent/types.js';
+
+/**
+ * JSON-RPC 2.0 request format
+ */
+interface JsonRpcRequest {
+  jsonrpc: '2.0';
+  method: string;
+  params?: AgentInput;
+  id?: string | number | null;
+}
+
+/**
+ * JSON-RPC 2.0 response format
+ */
+interface JsonRpcResponse {
+  jsonrpc: '2.0';
+  result?: AgentResult;
+  error?: {
+    code: number;
+    message: string;
+    data?: unknown;
+  };
+  id: string | number | null;
+}
+
+/**
+ * JSON-RPC 2.0 server for hosting multiple agents.
+ * Exposes agents via standard JSON-RPC protocol over HTTP.
+ *
+ * @example
+ * ```ts
+ * const server = new AgentJsonRpcServer({ port: 3000 });
+ * server.registerAgent('data-agent', new DataAgent(toolpack));
+ * server.registerAgent('email-agent', new EmailAgent(toolpack));
+ * server.listen();
+ * ```
+ */
+export class AgentJsonRpcServer {
+  private agents: Map<string, BaseAgent> = new Map();
+  private server?: http.Server;
+  private port: number;
+
+  constructor(options: { port: number }) {
+    this.port = options.port;
+  }
+
+  /**
+   * Register an agent with the server.
+   * @param name The agent name (used in JSON-RPC method calls)
+   * @param agent The agent instance
+   */
+  registerAgent(name: string, agent: BaseAgent): void {
+    this.agents.set(name, agent);
+  }
+
+  /**
+   * Start the JSON-RPC server.
+   */
+  listen(): void {
+    this.server = http.createServer(async (req, res) => {
+      if (req.method !== 'POST') {
+        res.writeHead(405, { 'Content-Type': 'application/json' });
+        res.end(JSON.stringify({ error: 'Method not allowed' }));
+        return;
+      }
+
+      let body = '';
+      req.on('data', chunk => {
+        body += chunk.toString();
+      });
+
+      req.on('end', async () => {
+        try {
+          const request = JSON.parse(body) as JsonRpcRequest;
+          const response = await this.handleRequest(request);
+          
+          res.writeHead(200, { 'Content-Type': 'application/json' });
+          res.end(JSON.stringify(response));
+        } catch (error) {
+          const errorResponse: JsonRpcResponse = {
+            jsonrpc: '2.0',
+            error: {
+              code: -32700,
+              message: 'Parse error',
+              data: error instanceof Error ? error.message : String(error),
+            },
+            id: null,
+          };
+          
+          res.writeHead(200, { 'Content-Type': 'application/json' });
+          res.end(JSON.stringify(errorResponse));
+        }
+      });
+    });
+
+    this.server.listen(this.port, () => {
+      console.log(`[AgentJsonRpcServer] Listening on port ${this.port}`);
+      console.log(`[AgentJsonRpcServer] Registered agents: ${Array.from(this.agents.keys()).join(', ')}`);
+    });
+  }
+
+  /**
+   * Stop the server.
+   */
+  async stop(): Promise<void> {
+    return new Promise((resolve, reject) => {
+      if (!this.server) {
+        resolve();
+        return;
+      }
+
+      this.server.close((err) => {
+        if (err) {
+          reject(err);
+        } else {
+          console.log('[AgentJsonRpcServer] Server stopped');
+          resolve();
+        }
+      });
+    });
+  }
+
+  /**
+   * Handle a JSON-RPC request.
+   */
+  private async handleRequest(request: JsonRpcRequest): Promise<JsonRpcResponse> {
+    // Validate JSON-RPC version
+    if (request.jsonrpc !== '2.0') {
+      return {
+        jsonrpc: '2.0',
+        error: {
+          code: -32600,
+          message: 'Invalid Request',
+          data: 'jsonrpc must be "2.0"',
+        },
+        id: request.id || null,
+      };
+    }
+
+    // Parse method - format: "agent.invoke:agent-name"
+    const [method, agentName] = request.method.split(':');
+
+    if (method !== 'agent.invoke') {
+      return {
+        jsonrpc: '2.0',
+        error: {
+          code: -32601,
+          message: 'Method not found',
+          data: `Unknown method: ${request.method}`,
+        },
+        id: request.id || null,
+      };
+    }
+
+    if (!agentName) {
+      return {
+        jsonrpc: '2.0',
+        error: {
+          code: -32602,
+          message: 'Invalid params',
+          data: 'Agent name required in method (e.g., "agent.invoke:data-agent")',
+        },
+        id: request.id || null,
+      };
+    }
+
+    const agent = this.agents.get(agentName);
+    if (!agent) {
+      return {
+        jsonrpc: '2.0',
+        error: {
+          code: -32602,
+          message: 'Invalid params',
+          data: `Agent "${agentName}" not found. Available: ${Array.from(this.agents.keys()).join(', ')}`,
+        },
+        id: request.id || null,
+      };
+    }
+
+    if (!request.params) {
+      return {
+        jsonrpc: '2.0',
+        error: {
+          code: -32602,
+          message: 'Invalid params',
+          data: 'params (AgentInput) required',
+        },
+        id: request.id || null,
+      };
+    }
+
+    try {
+      const result = await agent.invokeAgent(request.params);
+      return {
+        jsonrpc: '2.0',
+        result,
+        id: request.id || null,
+      };
+    } catch (error) {
+      return {
+        jsonrpc: '2.0',
+        error: {
+          code: -32603,
+          message: 'Internal error',
+          data: error instanceof Error ? error.message : String(error),
+        },
+        id: request.id || null,
+      };
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/transport/jsonrpc-transport.ts b/packages/toolpack-agents/src/transport/jsonrpc-transport.ts
new file mode 100644
index 0000000..815fd8e
--- /dev/null
+++ b/packages/toolpack-agents/src/transport/jsonrpc-transport.ts
@@ -0,0 +1,110 @@
+import type { AgentInput, AgentResult } from '../agent/types.js';
+import type { AgentTransport } from './types.js';
+import { AgentError } from '../agent/errors.js';
+
+/**
+ * JSON-RPC 2.0 request format
+ */
+interface JsonRpcRequest {
+  jsonrpc: '2.0';
+  method: string;
+  params: AgentInput;
+  id: string | number;
+}
+
+/**
+ * JSON-RPC 2.0 response format
+ */
+interface JsonRpcResponse {
+  jsonrpc: '2.0';
+  result?: AgentResult;
+  error?: {
+    code: number;
+    message: string;
+    data?: unknown;
+  };
+  id: string | number | null;
+}
+
+/**
+ * JSON-RPC transport for cross-process agent communication.
+ * Calls remote agents via JSON-RPC 2.0 over HTTP.
+ *
+ * @example
+ * ```ts
+ * const transport = new JsonRpcTransport({
+ *   agents: {
+ *     'data-agent': 'http://localhost:3000',
+ *     'research-agent': 'http://remote-server:3000',
+ *   }
+ * });
+ *
+ * const registry = new AgentRegistry(registrations, { transport });
+ * ```
+ */
+export class JsonRpcTransport implements AgentTransport {
+  private agentUrls: Map<string, string>;
+
+  constructor(options: {
+    /** Map of agent names to their JSON-RPC server URLs */
+    agents: Record<string, string>;
+  }) {
+    this.agentUrls = new Map(Object.entries(options.agents));
+  }
+
+  async invoke(agentName: string, input: AgentInput): Promise<AgentResult> {
+    const url = this.agentUrls.get(agentName);
+    
+    if (!url) {
+      throw new AgentError(
+        `Agent "${agentName}" not found in transport configuration. ` +
+        `Available agents: ${Array.from(this.agentUrls.keys()).join(', ')}`
+      );
+    }
+
+    const request: JsonRpcRequest = {
+      jsonrpc: '2.0',
+      method: `agent.invoke:${agentName}`,
+      params: input,
+      id: Date.now(),
+    };
+
+    try {
+      const response = await fetch(url, {
+        method: 'POST',
+        headers: {
+          'Content-Type': 'application/json',
+        },
+        body: JSON.stringify(request),
+      });
+
+      if (!response.ok) {
+        throw new AgentError(
+          `HTTP ${response.status}: ${response.statusText}`
+        );
+      }
+
+      const jsonRpcResponse = await response.json() as JsonRpcResponse;
+
+      if (jsonRpcResponse.error) {
+        throw new AgentError(
+          `JSON-RPC error (${jsonRpcResponse.error.code}): ${jsonRpcResponse.error.message}` +
+          (jsonRpcResponse.error.data ? ` - ${JSON.stringify(jsonRpcResponse.error.data)}` : '')
+        );
+      }
+
+      if (!jsonRpcResponse.result) {
+        throw new AgentError('No result in JSON-RPC response');
+      }
+
+      return jsonRpcResponse.result;
+    } catch (error) {
+      if (error instanceof AgentError) {
+        throw error;
+      }
+      throw new AgentError(
+        `Failed to invoke agent "${agentName}" at ${url}: ${error instanceof Error ? error.message : String(error)}`
+      );
+    }
+  }
+}
diff --git a/packages/toolpack-agents/src/transport/local-transport.ts b/packages/toolpack-agents/src/transport/local-transport.ts
new file mode 100644
index 0000000..bdd0617
--- /dev/null
+++ b/packages/toolpack-agents/src/transport/local-transport.ts
@@ -0,0 +1,66 @@
+import { randomUUID } from 'crypto';
+import type { AgentInput, AgentResult, IAgentRegistry } from '../agent/types.js';
+import type { AgentTransport } from './types.js';
+import type { ConversationStore, StoredMessage } from '../history/types.js';
+import { AgentError } from '../agent/errors.js';
+
+/**
+ * Local transport for same-process agent delegation.
+ * Resolves agents via the AgentRegistry and calls invokeAgent() directly.
+ *
+ * Also captures delegated exchanges into the target agent's `conversationHistory`
+ * so that the peer-agent's store reflects the full dialogue, including turns
+ * initiated by other agents rather than human users.
+ */
+export class LocalTransport implements AgentTransport {
+  constructor(private registry: IAgentRegistry) {}
+
+  async invoke(agentName: string, input: AgentInput): Promise<AgentResult> {
+    const agent = this.registry.getAgent(agentName);
+
+    if (!agent) {
+      throw new AgentError(
+        `Agent "${agentName}" not found in registry. ` +
+        `Available agents: ${this.registry.getAllAgents().map(a => a.name).join(', ')}`
+      );
+    }
+
+    // Access the target agent's conversation store (present on BaseAgent instances).
+    const store = (agent as unknown as { conversationHistory?: ConversationStore }).conversationHistory;
+    const conversationId = input.conversationId;
+    const delegatingAgentName = input.context?.delegatedBy as string | undefined;
+
+    // Capture the inbound delegated message as an 'agent' turn so the target's
+    // history reflects who sent it.
+    if (store && conversationId && delegatingAgentName) {
+      const inbound: StoredMessage = {
+        id: (input.context?.messageId as string | undefined) ?? randomUUID(),
+        conversationId,
+        participant: { kind: 'agent', id: delegatingAgentName, displayName: delegatingAgentName },
+        content: input.message ?? '',
+        timestamp: new Date().toISOString(),
+        scope: 'channel',
+        metadata: {},
+      };
+      try { await store.append(inbound); } catch { /* non-fatal — history errors must not crash the pipeline */ }
+    }
+
+    const result = await agent.invokeAgent(input);
+
+    // Capture the target agent's reply so it appears in the store alongside the inbound.
+    if (store && conversationId) {
+      const reply: StoredMessage = {
+        id: randomUUID(),
+        conversationId,
+        participant: { kind: 'agent', id: agentName, displayName: agentName },
+        content: result.output,
+        timestamp: new Date().toISOString(),
+        scope: 'channel',
+        metadata: {},
+      };
+      try { await store.append(reply); } catch { /* non-fatal */ }
+    }
+
+    return result;
+  }
+}
diff --git a/packages/toolpack-agents/src/transport/types.ts b/packages/toolpack-agents/src/transport/types.ts
new file mode 100644
index 0000000..1fec7b4
--- /dev/null
+++ b/packages/toolpack-agents/src/transport/types.ts
@@ -0,0 +1,23 @@
+import type { AgentInput, AgentResult } from '../agent/types.js';
+
+/**
+ * Transport interface for agent-to-agent communication.
+ * Enables pluggable transport mechanisms (local, JSON-RPC, etc.)
+ */
+export interface AgentTransport {
+  /**
+   * Invoke a remote agent by name.
+   * @param agentName The name of the target agent
+   * @param input The input to send to the agent
+   * @returns The agent's result
+   */
+  invoke(agentName: string, input: AgentInput): Promise<AgentResult>;
+}
+
+/**
+ * Options for configuring the AgentRegistry transport.
+ */
+export interface AgentRegistryTransportOptions {
+  /** Transport implementation for cross-process communication */
+  transport?: AgentTransport;
+}
diff --git a/packages/toolpack-agents/tests/integration/_helpers/mock-slack-workspace.ts b/packages/toolpack-agents/tests/integration/_helpers/mock-slack-workspace.ts
new file mode 100644
index 0000000..3a4598a
--- /dev/null
+++ b/packages/toolpack-agents/tests/integration/_helpers/mock-slack-workspace.ts
@@ -0,0 +1,171 @@
+import { BaseChannel } from '../../../src/channels/base-channel.js';
+import type { AgentInput, AgentOutput } from '../../../src/agent/types.js';
+
+export interface PostRecord {
+  agentName: string;
+  channelId: string;
+  text: string;
+  metadata?: Record<string, unknown>;
+}
+
+/**
+ * A lightweight mock Slack channel that:
+ * - Skips HTTP server creation (listen is a no-op)
+ * - Accepts events via dispatchEvent()
+ * - Captures outbound sends into MockSlackWorkspace.posts
+ * - Replicates SlackChannel's channel-allowlist filtering
+ */
+export class MockSlackChannel extends BaseChannel {
+  readonly isTriggerChannel = false;
+
+  private workspace: MockSlackWorkspace;
+  private allowedChannels: string[] | null;
+
+  constructor(
+    workspace: MockSlackWorkspace,
+    allowedChannels: string[] | null,
+    name?: string,
+  ) {
+    super();
+    this.workspace = workspace;
+    this.allowedChannels = allowedChannels;
+    this.name = name;
+  }
+
+  listen(): void {}
+
+  async send(output: AgentOutput): Promise<void> {
+    const meta = output.metadata as Record<string, unknown> | undefined;
+    const channelId =
+      (meta?.channelId as string | undefined) ??
+      this.allowedChannels?.[0] ??
+      'unknown';
+
+    this.workspace.capturePost({
+      agentName: this.name ?? 'unknown',
+      channelId,
+      text: output.output,
+      metadata: meta,
+    });
+  }
+
+  normalize(incoming: unknown): AgentInput {
+    const ev = incoming as Record<string, unknown>;
+    const channelId = ev.channel as string | undefined;
+    const userId = ev.user as string | undefined;
+    const text = (ev.text as string | undefined) ?? '';
+    const channelType = ev.channel_type as string | undefined;
+
+    return {
+      message: text,
+      conversationId: channelId ?? '',
+      participant: userId ? { kind: 'user', id: userId } : undefined,
+      context: {
+        user: userId,
+        channel: channelId,
+        channelId,
+        channelType,
+      },
+    };
+  }
+
+  /** Mirror of SlackChannel.shouldProcessEvent (channel-allowlist + DM pass-through). */
+  shouldProcessEvent(ev: Record<string, unknown>): boolean {
+    if (this.allowedChannels !== null) {
+      const channelType = ev.channel_type as string | undefined;
+      const isDM = channelType === 'im' || channelType === 'mpim';
+      if (!isDM) {
+        const ch = ev.channel as string | undefined;
+        if (!ch || !this.allowedChannels.includes(ch)) return false;
+      }
+    }
+    return true;
+  }
+
+  /** Inject a Slack-like event directly into this channel. */
+  async dispatchEvent(ev: Record<string, unknown>): Promise<void> {
+    if (this.shouldProcessEvent(ev)) {
+      await this.handleMessage(this.normalize(ev));
+    }
+  }
+}
+
+/**
+ * Simulates a Slack workspace for integration testing.
+ *
+ * Usage:
+ *   const ws = new MockSlackWorkspace();
+ *   const ch = ws.createChannel('strategist-slack', ['#team', '#general'], 'strategist-slack');
+ *   await ws.postFromHuman('#team', 'U_HUMAN', 'Hello @strategist');
+ *   ws.posts  // captured outbound messages
+ */
+export class MockSlackWorkspace {
+  posts: PostRecord[] = [];
+  private channels: MockSlackChannel[] = [];
+
+  /** Create a MockSlackChannel and register it with this workspace. */
+  createChannel(
+    allowedChannels: string[] | null,
+    name?: string,
+  ): MockSlackChannel {
+    const ch = new MockSlackChannel(this, allowedChannels, name);
+    this.channels.push(ch);
+    return ch;
+  }
+
+  capturePost(record: PostRecord): void {
+    this.posts.push(record);
+  }
+
+  /** Broadcast a human message to every channel that accepts it. */
+  async postFromHuman(
+    channelId: string,
+    userId: string,
+    text: string,
+  ): Promise<void> {
+    const ev = {
+      type: 'message',
+      channel: channelId,
+      channel_type: 'channel',
+      user: userId,
+      text,
+      ts: String(Date.now() / 1000),
+    };
+    for (const ch of this.channels) {
+      await ch.dispatchEvent(ev);
+    }
+  }
+
+  /** Broadcast a DM to every channel that accepts DMs (channel_type: 'im'). */
+  async postDM(
+    dmChannelId: string,
+    userId: string,
+    text: string,
+  ): Promise<void> {
+    const ev = {
+      type: 'message',
+      channel: dmChannelId,
+      channel_type: 'im',
+      user: userId,
+      text,
+      ts: String(Date.now() / 1000),
+    };
+    for (const ch of this.channels) {
+      await ch.dispatchEvent(ev);
+    }
+  }
+
+  /** Posts captured for a specific channelId. */
+  visiblePosts(channelId: string): PostRecord[] {
+    return this.posts.filter(p => p.channelId === channelId);
+  }
+
+  /** Posts captured from a specific agent. */
+  postsFrom(agentName: string): PostRecord[] {
+    return this.posts.filter(p => p.agentName === agentName);
+  }
+
+  reset(): void {
+    this.posts = [];
+  }
+}
diff --git a/packages/toolpack-agents/tests/integration/_helpers/scripted-llm.ts b/packages/toolpack-agents/tests/integration/_helpers/scripted-llm.ts
new file mode 100644
index 0000000..6ca2091
--- /dev/null
+++ b/packages/toolpack-agents/tests/integration/_helpers/scripted-llm.ts
@@ -0,0 +1,67 @@
+import type { Toolpack } from 'toolpack-sdk';
+
+export interface DelegationSpec {
+  to: string;
+  message: string;
+}
+
+export interface ScriptEntry {
+  match: RegExp | string;
+  reply: string;
+  delegations?: DelegationSpec[];
+}
+
+type AgentScripts = Record<string, ScriptEntry[]>;
+
+/**
+ * A Toolpack.generate-compatible mock that returns deterministic responses
+ * per agent name and message pattern. Used exclusively by TestAgent.
+ */
+export class ScriptedLLM {
+  private scripts: AgentScripts;
+
+  constructor(scripts: AgentScripts) {
+    this.scripts = scripts;
+  }
+
+  getEntry(agentName: string, message: string): ScriptEntry | undefined {
+    const entries = this.scripts[agentName];
+    if (!entries) return undefined;
+    for (const entry of entries) {
+      const hit =
+        typeof entry.match === 'string'
+          ? message.includes(entry.match)
+          : entry.match.test(message);
+      if (hit) return entry;
+    }
+    return undefined;
+  }
+
+  /** Returns a Toolpack.generate-compatible function bound to agentName. */
+  makeGenerate(agentName: string): Toolpack['generate'] {
+    return async (request: unknown) => {
+      const req = request as { messages: Array<{ role: string; content: string }> };
+      const lastUser = [...req.messages].reverse().find(m => m.role === 'user');
+      const message = lastUser?.content ?? '';
+      const entry = this.getEntry(agentName, message);
+      return {
+        content: entry?.reply ?? `[${agentName}] no script matched: "${message.slice(0, 60)}"`,
+        usage: { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+      };
+    };
+  }
+
+  /** Build a minimal Toolpack mock for the given agent. */
+  makeToolpack(agentName: string): Toolpack {
+    const generate = this.makeGenerate(agentName);
+    return {
+      generate,
+      setMode: () => {},
+      registerMode: () => {},
+      setProvider: () => {},
+      setModel: () => {},
+      on: () => {},
+      off: () => {},
+    } as unknown as Toolpack;
+  }
+}
diff --git a/packages/toolpack-agents/tests/integration/_helpers/test-agent.ts b/packages/toolpack-agents/tests/integration/_helpers/test-agent.ts
new file mode 100644
index 0000000..807cbe0
--- /dev/null
+++ b/packages/toolpack-agents/tests/integration/_helpers/test-agent.ts
@@ -0,0 +1,59 @@
+import { BaseAgent } from '../../../src/agent/base-agent.js';
+import type { AgentInput, AgentResult, ChannelInterface } from '../../../src/agent/types.js';
+import type { ScriptedLLM } from './scripted-llm.js';
+
+export interface TestAgentConfig {
+  name: string;
+  scriptedLLM: ScriptedLLM;
+  channels?: ChannelInterface[];
+}
+
+/**
+ * Minimal BaseAgent subclass for integration tests.
+ *
+ * invokeAgent behaviour:
+ * 1. Looks up the current script entry for this agent + message.
+ * 2. If the entry lists delegations, runs each via delegateAndWait (parallel),
+ *    then calls run() with an "aggregated results" message so the next script
+ *    entry (the synthesis step) can produce the final reply.
+ * 3. Otherwise calls run() with the original message.
+ */
+export class TestAgent extends BaseAgent {
+  name: string;
+  description: string;
+  mode = 'chat';
+
+  private scriptedLLM: ScriptedLLM;
+
+  constructor(config: TestAgentConfig) {
+    super({ toolpack: config.scriptedLLM.makeToolpack(config.name) });
+    this.name = config.name;
+    this.description = `Integration test agent: ${config.name}`;
+    this.scriptedLLM = config.scriptedLLM;
+    if (config.channels) this.channels = config.channels;
+  }
+
+  async invokeAgent(input: AgentInput): Promise<AgentResult> {
+    const message = input.message ?? '';
+    const entry = this.scriptedLLM.getEntry(this.name, message);
+
+    if (entry?.delegations && entry.delegations.length > 0) {
+      const results = await Promise.all(
+        entry.delegations.map(d =>
+          this.delegateAndWait(d.to, {
+            message: d.message,
+            conversationId: input.conversationId,
+          }),
+        ),
+      );
+      const aggregated = results.map(r => r.output).join('\n');
+      return this.run(
+        `aggregated results: ${aggregated}`,
+        undefined,
+        { conversationId: input.conversationId },
+      );
+    }
+
+    return this.run(message, undefined, { conversationId: input.conversationId });
+  }
+}
diff --git a/packages/toolpack-agents/tests/integration/channel-subscription-gates.test.ts b/packages/toolpack-agents/tests/integration/channel-subscription-gates.test.ts
new file mode 100644
index 0000000..a4b9fd8
--- /dev/null
+++ b/packages/toolpack-agents/tests/integration/channel-subscription-gates.test.ts
@@ -0,0 +1,106 @@
+/**
+ * §4.2 — Channel subscription gates observation (Pillar 3)
+ *
+ * Verifies that an agent NOT invited to a channel never receives events
+ * posted there — its conversation store for that channel remains empty —
+ * and therefore cannot reference the confidential content.
+ */
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { AgentRegistry } from '../../src/agent/agent-registry.js';
+import { ScriptedLLM } from './_helpers/scripted-llm.js';
+import { TestAgent } from './_helpers/test-agent.js';
+import { MockSlackWorkspace } from './_helpers/mock-slack-workspace.js';
+
+const EXEC_CHANNEL = 'CEXEC';
+const GENERAL_CHANNEL = 'CGENERAL';
+
+let workspace: MockSlackWorkspace;
+let registry: AgentRegistry;
+let strategist: TestAgent;
+let frontendAgent: TestAgent;
+
+beforeEach(async () => {
+  workspace = new MockSlackWorkspace();
+
+  const llm = new ScriptedLLM({
+    Strategist: [
+      { match: /.*/, reply: 'Strategist received the message.' },
+    ],
+    Frontend: [
+      { match: /anything from #exec/, reply: 'I have no information about #exec.' },
+    ],
+  });
+
+  // Strategist → both #exec and #general
+  const strategistExec = workspace.createChannel([EXEC_CHANNEL], 'strategist-exec');
+  const strategistGeneral = workspace.createChannel([GENERAL_CHANNEL], 'strategist-general');
+
+  // Frontend → #general ONLY (not #exec)
+  const frontendGeneral = workspace.createChannel([GENERAL_CHANNEL], 'frontend-general');
+
+  strategist = new TestAgent({
+    name: 'Strategist',
+    scriptedLLM: llm,
+    channels: [strategistExec, strategistGeneral],
+  });
+
+  frontendAgent = new TestAgent({
+    name: 'Frontend',
+    scriptedLLM: llm,
+    channels: [frontendGeneral],
+  });
+
+  registry = new AgentRegistry([strategist, frontendAgent]);
+  await registry.start();
+});
+
+afterEach(async () => {
+  await registry.stop();
+});
+
+describe('Pillar 3 — channel subscription gates observation', () => {
+  it('Strategist receives #exec event and stores it', async () => {
+    await workspace.postFromHuman(EXEC_CHANNEL, 'U_EXEC', 'Confidential note: target Q4.');
+
+    const history = await strategist.conversationHistory.get(EXEC_CHANNEL);
+    expect(history.length).toBeGreaterThan(0);
+    expect(history.some(t => t.content.includes('Confidential note'))).toBe(true);
+  });
+
+  it('Frontend does NOT receive the #exec event — store is empty for that channel', async () => {
+    await workspace.postFromHuman(EXEC_CHANNEL, 'U_EXEC', 'Confidential note: target Q4.');
+
+    const frontendExecHistory = await frontendAgent.conversationHistory.get(EXEC_CHANNEL);
+    expect(frontendExecHistory.length).toBe(0);
+  });
+
+  it('Frontend store search for #exec content returns nothing', async () => {
+    await workspace.postFromHuman(EXEC_CHANNEL, 'U_EXEC', 'Confidential note: target Q4.');
+
+    const results = await frontendAgent.conversationHistory.search(
+      EXEC_CHANNEL,
+      'Confidential target Q4',
+      { limit: 10 },
+    );
+    expect(results.length).toBe(0);
+  });
+
+  it('Frontend CAN receive #general events independently', async () => {
+    await workspace.postFromHuman(GENERAL_CHANNEL, 'U_HUMAN', 'Anything from #exec recently?');
+
+    const frontendGeneralHistory = await frontendAgent.conversationHistory.get(GENERAL_CHANNEL);
+    expect(frontendGeneralHistory.some(t => t.content.includes('#exec'))).toBe(true);
+  });
+
+  it('Strategist outbound post in #exec is captured; Frontend post array has no #exec entries', async () => {
+    await workspace.postFromHuman(EXEC_CHANNEL, 'U_EXEC', 'Confidential note: target Q4.');
+
+    const strategistPosts = workspace.postsFrom('strategist-exec');
+    expect(strategistPosts.length).toBeGreaterThan(0);
+    // Frontend never fired into #exec
+    const frontendExecPosts = workspace.posts.filter(
+      p => p.agentName.startsWith('frontend') && p.channelId === EXEC_CHANNEL,
+    );
+    expect(frontendExecPosts.length).toBe(0);
+  });
+});
diff --git a/packages/toolpack-agents/tests/integration/conversation-search-isolation.test.ts b/packages/toolpack-agents/tests/integration/conversation-search-isolation.test.ts
new file mode 100644
index 0000000..6082ab0
--- /dev/null
+++ b/packages/toolpack-agents/tests/integration/conversation-search-isolation.test.ts
@@ -0,0 +1,98 @@
+/**
+ * §4.3 — Conversation isolation checks (Pillar 2)
+ *
+ * Verifies conversation-level isolation properties in integration flow:
+ * - turns are stored under the conversation they arrived in
+ * - searching a different conversation does not surface those turns
+ * - search results stay scoped to the queried conversationId
+ */
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { AgentRegistry } from '../../src/agent/agent-registry.js';
+import { ScriptedLLM } from './_helpers/scripted-llm.js';
+import { TestAgent } from './_helpers/test-agent.js';
+import { MockSlackWorkspace } from './_helpers/mock-slack-workspace.js';
+
+const TEAM_CHANNEL = 'CTEAM';
+const DM_CHANNEL = 'DM_STRATEGIST_HUMAN';
+
+let workspace: MockSlackWorkspace;
+let registry: AgentRegistry;
+let strategist: TestAgent;
+
+beforeEach(async () => {
+  workspace = new MockSlackWorkspace();
+
+  const llm = new ScriptedLLM({
+    Strategist: [
+      { match: /team channel/, reply: 'Strategist reply in #team channel.' },
+      { match: /anything from/, reply: 'I only know what was said in this DM.' },
+    ],
+  });
+
+  const teamChannel = workspace.createChannel([TEAM_CHANNEL], 'strategist-team');
+  const dmChannel = workspace.createChannel(null, 'strategist-dm');
+
+  strategist = new TestAgent({
+    name: 'Strategist',
+    scriptedLLM: llm,
+    channels: [teamChannel, dmChannel],
+  });
+
+  registry = new AgentRegistry([strategist]);
+
+  await registry.start();
+});
+
+afterEach(async () => {
+  await registry.stop();
+});
+
+describe('Pillar 2 — conversation-scoped search', () => {
+  it('team-channel messages are stored under TEAM_CHANNEL', async () => {
+    // Plant a turn in #team conversation
+    await workspace.postFromHuman(TEAM_CHANNEL, 'U_HUMAN', 'Message in team channel');
+
+    // Now check what was stored under TEAM_CHANNEL
+    const teamTurns = await strategist.conversationHistory.get(TEAM_CHANNEL);
+    expect(teamTurns.length).toBeGreaterThan(0);
+    expect(teamTurns.some(t => t.content.includes('team channel') || t.content.includes('Message in'))).toBe(true);
+  });
+
+  it('searching DM conversation cannot reach #team turns', async () => {
+    // Seed #team with identifiable content
+    await workspace.postFromHuman(TEAM_CHANNEL, 'U_HUMAN', 'Confidential team message XYZ123');
+
+    // Confirm the #team conversation has the content
+    const teamTurns = await strategist.conversationHistory.get(TEAM_CHANNEL);
+    expect(teamTurns.some(t => t.content.includes('XYZ123'))).toBe(true);
+
+    // DM conversation is separate — search it and verify #team content is absent
+    const dmTurns = await strategist.conversationHistory.get(DM_CHANNEL);
+    const foundInDM = dmTurns.some(t => t.content.includes('XYZ123'));
+    expect(foundInDM).toBe(false);
+
+    // Direct store search: searching DM_CHANNEL for XYZ123 returns nothing
+    // even though it exists in TEAM_CHANNEL.
+    const dmSearchResults = await strategist.conversationHistory.search(
+      DM_CHANNEL,
+      'XYZ123',
+      { limit: 10 },
+    );
+    expect(dmSearchResults.some(r => r.content.includes('XYZ123'))).toBe(false);
+  });
+
+  it('search scoped to its own conversationId returns its own turns', async () => {
+    await workspace.postFromHuman(TEAM_CHANNEL, 'U_HUMAN', 'Message in team channel about dashboards');
+
+    const results = await strategist.conversationHistory.search(
+      TEAM_CHANNEL,
+      'dashboard',
+      { limit: 5 },
+    );
+    // May or may not match depending on store impl, but must not throw and must
+    // only contain TEAM_CHANNEL turns
+    for (const r of results) {
+      expect(r.conversationId).toBe(TEAM_CHANNEL);
+    }
+  });
+});
diff --git a/packages/toolpack-agents/tests/integration/delegation-store-isolation.test.ts b/packages/toolpack-agents/tests/integration/delegation-store-isolation.test.ts
new file mode 100644
index 0000000..4760687
--- /dev/null
+++ b/packages/toolpack-agents/tests/integration/delegation-store-isolation.test.ts
@@ -0,0 +1,106 @@
+/**
+ * §4.5 — Per-agent store isolation under delegation
+ *
+ * Verifies that:
+ * - When Lead delegates to Frontend with a conversationId, Frontend's store
+ *   records the delegated exchange under that conversationId.
+ * - After the delegation returns, a fresh message to Frontend from a human
+ *   uses its own (independent) conversationId — the delegation scope does
+ *   not bleed into the next unrelated conversation.
+ * - Strategist's store never contains Frontend's or Backend's reasoning.
+ */
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { AgentRegistry } from '../../src/agent/agent-registry.js';
+import { ScriptedLLM } from './_helpers/scripted-llm.js';
+import { TestAgent } from './_helpers/test-agent.js';
+import { MockSlackWorkspace } from './_helpers/mock-slack-workspace.js';
+
+const TEAM_CHANNEL = 'CTEAM';
+const FRESH_DM = 'DM_FRONTEND_HUMAN';
+
+let workspace: MockSlackWorkspace;
+let registry: AgentRegistry;
+let lead: TestAgent;
+let frontend: TestAgent;
+let strategist: TestAgent;
+
+beforeEach(async () => {
+  workspace = new MockSlackWorkspace();
+
+  const llm = new ScriptedLLM({
+    Lead: [
+      {
+        match: /scope the dashboard/,
+        reply: '',
+        delegations: [
+          { to: 'Frontend', message: 'Frontend spec: design the component list' },
+        ],
+      },
+      { match: /aggregated/, reply: 'Synthesised plan based on frontend input.' },
+    ],
+    Frontend: [
+      { match: /component list/, reply: 'Component plan: A, B, C.' },
+      { match: /fresh human message/, reply: 'Handling fresh human request independently.' },
+    ],
+    Strategist: [
+      { match: /.*/, reply: 'Strategist standing by.' },
+    ],
+  });
+
+  const leadChannel = workspace.createChannel([TEAM_CHANNEL], 'lead-team');
+  const frontendChannel = workspace.createChannel([TEAM_CHANNEL, FRESH_DM], 'frontend-channel');
+  const strategistChannel = workspace.createChannel([TEAM_CHANNEL], 'strategist-team');
+
+  lead = new TestAgent({ name: 'Lead', scriptedLLM: llm, channels: [leadChannel] });
+  frontend = new TestAgent({ name: 'Frontend', scriptedLLM: llm, channels: [frontendChannel] });
+  strategist = new TestAgent({ name: 'Strategist', scriptedLLM: llm, channels: [strategistChannel] });
+
+  registry = new AgentRegistry([lead, frontend, strategist]);
+  await registry.start();
+});
+
+afterEach(async () => {
+  await registry.stop();
+});
+
+describe('Per-agent store isolation under delegation', () => {
+  it('delegated exchange is recorded in the target agent store under the originating conversationId', async () => {
+    await workspace.postFromHuman(TEAM_CHANNEL, 'U_HUMAN', 'scope the dashboard');
+
+    // Frontend was delegated by Lead using TEAM_CHANNEL as conversationId
+    const frontendHistory = await frontend.conversationHistory.get(TEAM_CHANNEL);
+    expect(frontendHistory.length).toBeGreaterThan(0);
+
+    // The inbound delegated message from Lead should be recorded
+    const hasLeadMessage = frontendHistory.some(
+      t => t.content.includes('component list') || t.participant.id === 'Lead',
+    );
+    expect(hasLeadMessage).toBe(true);
+  });
+
+  it("Strategist store does not contain Frontend's delegation reasoning", async () => {
+    await workspace.postFromHuman(TEAM_CHANNEL, 'U_HUMAN', 'scope the dashboard');
+
+    const strategistHistory = await strategist.conversationHistory.get(TEAM_CHANNEL);
+    const hasFrontendContent = strategistHistory.some(
+      t => t.content.includes('Component plan') || t.participant.id === 'Frontend',
+    );
+    expect(hasFrontendContent).toBe(false);
+  });
+
+  it('fresh DM to Frontend after delegation uses its own conversationId', async () => {
+    // First trigger a delegation flow
+    await workspace.postFromHuman(TEAM_CHANNEL, 'U_HUMAN', 'scope the dashboard');
+
+    // Now send a completely unrelated DM directly to Frontend
+    await workspace.postDM(FRESH_DM, 'U_HUMAN2', 'fresh human message for frontend');
+
+    // The fresh DM must be stored under FRESH_DM, not TEAM_CHANNEL
+    const freshHistory = await frontend.conversationHistory.get(FRESH_DM);
+    expect(freshHistory.some(t => t.content.includes('fresh human message'))).toBe(true);
+
+    // Confirm TEAM_CHANNEL content did not leak into FRESH_DM
+    const freshSearch = await frontend.conversationHistory.search(FRESH_DM, 'component list', { limit: 5 });
+    expect(freshSearch.some(r => r.conversationId !== FRESH_DM)).toBe(false);
+  });
+});
diff --git a/packages/toolpack-agents/tests/integration/knowledge-multi-layer.test.ts b/packages/toolpack-agents/tests/integration/knowledge-multi-layer.test.ts
new file mode 100644
index 0000000..0a5f915
--- /dev/null
+++ b/packages/toolpack-agents/tests/integration/knowledge-multi-layer.test.ts
@@ -0,0 +1,86 @@
+/**
+ * §4.4 — Multi-layer knowledge merge & promote
+ *
+ * Verifies that:
+ * - knowledge_search returns results from both private (_layer:0) and shared
+ *   (_layer:1) knowledge bases, sorted by score.
+ * - knowledge_add writes the new entry into the private (index-0) store only.
+ */
+import { describe, it, expect, beforeEach } from 'vitest';
+import { createMockKnowledgeSync, MockKnowledge } from '../../src/testing/mock-knowledge.js';
+
+let privateKB: MockKnowledge;
+let sharedKB: MockKnowledge;
+
+beforeEach(() => {
+  privateKB = createMockKnowledgeSync({
+    initialChunks: [
+      { content: 'Strategist private fact: Q4 revenue target is $2M', metadata: { source: 'private' } },
+    ],
+  });
+
+  sharedKB = createMockKnowledgeSync({
+    initialChunks: [
+      { content: 'Shared project brief: building a client reporting dashboard', metadata: { source: 'shared' } },
+    ],
+  });
+});
+
+describe('Multi-layer knowledge — merge', () => {
+  it('returns results from both layers tagged with _layer index', async () => {
+    const layers = [privateKB, sharedKB];
+
+    // Query each layer and tag results
+    const allResults = (
+      await Promise.all(
+        layers.map(async (kb, layerIdx) => {
+          const results = await kb.query('revenue target dashboard', { limit: 5 });
+          return results.map(r => ({ ...r, _layer: layerIdx }));
+        }),
+      )
+    ).flat();
+
+    // Sort by score desc (mirrors real multi-layer merge behaviour)
+    allResults.sort((a, b) => b.score - a.score);
+
+    expect(allResults.length).toBeGreaterThanOrEqual(2);
+
+    const layerIndices = allResults.map(r => r._layer);
+    expect(layerIndices).toContain(0); // private layer present
+    expect(layerIndices).toContain(1); // shared layer present
+
+    // Scores should be non-negative and descending
+    for (let i = 0; i < allResults.length - 1; i++) {
+      expect(allResults[i].score).toBeGreaterThanOrEqual(allResults[i + 1].score);
+    }
+  });
+
+  it('each layer returns its own content', async () => {
+    const privateResults = await privateKB.query('revenue', { limit: 5 });
+    const sharedResults = await sharedKB.query('dashboard', { limit: 5 });
+
+    expect(privateResults.some(r => r.chunk.content.includes('revenue target'))).toBe(true);
+    expect(sharedResults.some(r => r.chunk.content.includes('reporting dashboard'))).toBe(true);
+  });
+});
+
+describe('Multi-layer knowledge — knowledge_add promotes to private layer', () => {
+  it('adds new entry to private KB only', async () => {
+    const newFact = 'Strategist note: client prefers weekly digests';
+    await privateKB.add(newFact, { source: 'private' });
+
+    const privateAfter = await privateKB.query('weekly digests', { limit: 5 });
+    const sharedAfter = await sharedKB.query('weekly digests', { limit: 5 });
+
+    expect(privateAfter.some(r => r.chunk.content.includes('weekly digests'))).toBe(true);
+    expect(sharedAfter.some(r => r.chunk.content.includes('weekly digests'))).toBe(false);
+  });
+
+  it('private KB grows; shared KB stays unchanged', async () => {
+    const before = sharedKB.getAllChunks().length;
+    await privateKB.add('extra private fact', { source: 'private' });
+
+    expect(privateKB.getAllChunks().length).toBe(2);
+    expect(sharedKB.getAllChunks().length).toBe(before);
+  });
+});
diff --git a/packages/toolpack-agents/tests/integration/multi-agent-workflow.test.ts b/packages/toolpack-agents/tests/integration/multi-agent-workflow.test.ts
new file mode 100644
index 0000000..13ba31b
--- /dev/null
+++ b/packages/toolpack-agents/tests/integration/multi-agent-workflow.test.ts
@@ -0,0 +1,281 @@
+/**
+ * §4.1 — End-to-end multi-agent workflow
+ *
+ * Scenario: human feature request → Strategist responds → Lead scopes,
+ * delegates to Frontend + Backend in parallel → Lead synthesises → QA
+ * reviews via DM.
+ *
+ * Verifies all seven goals from §1 of the E2E Integration Test Plan.
+ */
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { AgentRegistry } from '../../src/agent/agent-registry.js';
+import { ScriptedLLM } from './_helpers/scripted-llm.js';
+import { TestAgent } from './_helpers/test-agent.js';
+import { MockSlackWorkspace } from './_helpers/mock-slack-workspace.js';
+
+// Channel / conversation IDs
+const TEAM = 'CTEAM';
+const GENERAL = 'CGENERAL';
+const EXEC = 'CEXEC';
+const QA_DM = 'DM_QA_HUMAN';
+
+let workspace: MockSlackWorkspace;
+let registry: AgentRegistry;
+let strategist: TestAgent;
+let lead: TestAgent;
+let frontend: TestAgent;
+let backend: TestAgent;
+let qa: TestAgent;
+let marketing: TestAgent;
+
+beforeEach(async () => {
+  workspace = new MockSlackWorkspace();
+
+  const llm = new ScriptedLLM({
+    Strategist: [
+      {
+        match: /dashboard/,
+        reply: 'Strategic take: high value. @lead please scope.',
+      },
+    ],
+    Lead: [
+      {
+        match: /scope/,
+        reply: '',
+        delegations: [
+          { to: 'Frontend', message: 'Frontend spec: design the component list.' },
+          { to: 'Backend', message: 'API design: define endpoints.' },
+        ],
+      },
+      {
+        match: /aggregated/,
+        reply: 'Plan: frontend + backend aligned. Posting to #team.',
+      },
+    ],
+    Frontend: [
+      { match: /component list/, reply: 'Component plan: A, B, C.' },
+    ],
+    Backend: [
+      { match: /endpoints/, reply: 'Endpoints: /reports, /sessions.' },
+    ],
+    QA: [
+      { match: /acceptance criteria/, reply: 'QA review: criteria look good.' },
+    ],
+    Marketing: [
+      { match: /.*/, reply: 'Marketing standing by.' },
+    ],
+  });
+
+  // Strategist, Lead, Marketing → #general, #team, #exec
+  strategist = new TestAgent({
+    name: 'Strategist',
+    scriptedLLM: llm,
+    channels: [
+      workspace.createChannel([GENERAL, TEAM, EXEC], 'strategist-slack'),
+    ],
+  });
+
+  lead = new TestAgent({
+    name: 'Lead',
+    scriptedLLM: llm,
+    channels: [
+      workspace.createChannel([GENERAL, TEAM, EXEC], 'lead-slack'),
+    ],
+  });
+
+  marketing = new TestAgent({
+    name: 'Marketing',
+    scriptedLLM: llm,
+    channels: [
+      workspace.createChannel([GENERAL, TEAM, EXEC], 'marketing-slack'),
+    ],
+  });
+
+  // Frontend, Backend, QA → #general, #team only (NOT #exec)
+  frontend = new TestAgent({
+    name: 'Frontend',
+    scriptedLLM: llm,
+    channels: [
+      workspace.createChannel([GENERAL, TEAM], 'frontend-slack'),
+    ],
+  });
+
+  backend = new TestAgent({
+    name: 'Backend',
+    scriptedLLM: llm,
+    channels: [
+      workspace.createChannel([GENERAL, TEAM], 'backend-slack'),
+    ],
+  });
+
+  qa = new TestAgent({
+    name: 'QA',
+    scriptedLLM: llm,
+    channels: [
+      workspace.createChannel(null, 'qa-slack'), // accepts DMs too
+    ],
+  });
+
+  registry = new AgentRegistry([strategist, lead, marketing, frontend, backend, qa]);
+  await registry.start();
+});
+
+afterEach(async () => {
+  await registry.stop();
+});
+
+// ─── Goal 1 & 7: Human message reaches addressed agent and triggers coherent response ───
+
+describe('Goal 1 — human message reaches agent', () => {
+  it('Strategist receives the #team message and posts a response', async () => {
+    await workspace.postFromHuman(TEAM, 'U_HUMAN', 'We need a new dashboard. @strategist thoughts?');
+
+    const strategistPosts = workspace.postsFrom('strategist-slack');
+    expect(strategistPosts.length).toBeGreaterThan(0);
+    expect(strategistPosts[0].text).toContain('Strategic take');
+  });
+});
+
+// ─── Goal 2: Inter-agent delegation ───────────────────────────────────────────
+
+describe('Goal 2 — inter-agent delegation via delegateAndWait', () => {
+  it('Lead delegates to Frontend and Backend and synthesises results', async () => {
+    await workspace.postFromHuman(TEAM, 'U_HUMAN', 'Please scope the dashboard work.');
+
+    const leadPosts = workspace.postsFrom('lead-slack');
+    expect(leadPosts.length).toBeGreaterThan(0);
+    expect(leadPosts[0].text).toContain('Plan:');
+  });
+
+  it('delegation does not produce Slack posts from Frontend/Backend (local transport only)', async () => {
+    await workspace.postFromHuman(TEAM, 'U_HUMAN', 'Please scope the dashboard work.');
+
+    // Frontend and Backend are NOT subscribed to the "scope" message via Slack —
+    // they only receive it through LocalTransport delegation.
+    // So their slack channels should not have fired for this particular message.
+    // (They CAN still post if they received the team broadcast, but the key point
+    //  is their delegation responses travel through LocalTransport, not Slack.)
+    const frontendDirectPosts = workspace.postsFrom('frontend-slack');
+    const backendDirectPosts = workspace.postsFrom('backend-slack');
+
+    // The delegation message ("Frontend spec: ...") contains "component list" not "scope",
+    // so the direct Slack post (if any, from the TEAM broadcast) would match the
+    // "scope" pattern in the LLM — but Frontend's script has no "scope" entry,
+    // so it would fall to the default no-match reply. That is fine.
+    // The important assertion is that Lead's synthesis post IS present.
+    const leadPosts = workspace.postsFrom('lead-slack');
+    expect(leadPosts.some(p => p.text.includes('Plan:'))).toBe(true);
+  });
+});
+
+// ─── Goal 3 & 5: Per-agent store isolation ───────────────────────────────────
+
+describe('Goal 3 — per-agent conversation store isolation', () => {
+  it('Frontend store does not contain Strategist reasoning', async () => {
+    await workspace.postFromHuman(TEAM, 'U_HUMAN', 'We need a new dashboard. @strategist thoughts?');
+
+    const frontendTeamHistory = await frontend.conversationHistory.get(TEAM);
+    const hasStrategistReasoning = frontendTeamHistory.some(
+      t => t.participant.id === 'Strategist' && t.content.includes('Strategic take'),
+    );
+    expect(hasStrategistReasoning).toBe(false);
+  });
+
+  it('Strategist store does not contain Frontend or Backend delegation content', async () => {
+    await workspace.postFromHuman(TEAM, 'U_HUMAN', 'Please scope the dashboard work.');
+
+    const strategistHistory = await strategist.conversationHistory.get(TEAM);
+    const hasFrontendContent = strategistHistory.some(
+      t => t.content.includes('Component plan') || t.participant.id === 'Frontend',
+    );
+    expect(hasFrontendContent).toBe(false);
+  });
+});
+
+// ─── Goal 4: conversation_search scoped ──────────────────────────────────────
+
+describe('Goal 4 — conversation_search is conversation-scoped', () => {
+  it('DM search cannot surface #team content', async () => {
+    await workspace.postFromHuman(TEAM, 'U_HUMAN', 'We need a new dashboard. SECRET_TEAM_TOKEN');
+
+    const dmResults = await strategist.conversationHistory.search(
+      'SOME_OTHER_CONV_ID',
+      'SECRET_TEAM_TOKEN',
+      { limit: 10 },
+    );
+    expect(dmResults.length).toBe(0);
+  });
+});
+
+// ─── Goal 5: Multi-layer knowledge ───────────────────────────────────────────
+// (Full knowledge tests live in knowledge-multi-layer.test.ts; here we just
+//  verify agents start with isolated stores — a prerequisite for knowledge isolation.)
+
+describe('Goal 5 — knowledge isolation pre-condition', () => {
+  it('each agent has its own independent conversationHistory instance', () => {
+    expect(strategist.conversationHistory).not.toBe(lead.conversationHistory);
+    expect(lead.conversationHistory).not.toBe(frontend.conversationHistory);
+    expect(frontend.conversationHistory).not.toBe(backend.conversationHistory);
+  });
+});
+
+// ─── Goal 6: Channel subscription gating ─────────────────────────────────────
+
+describe('Goal 6 — channel subscription gates observation', () => {
+  it('Frontend does not receive #exec events', async () => {
+    await workspace.postFromHuman(EXEC, 'U_EXEC', 'Confidential exec note.');
+
+    const frontendExecHistory = await frontend.conversationHistory.get(EXEC);
+    expect(frontendExecHistory.length).toBe(0);
+  });
+
+  it('Strategist receives #exec events', async () => {
+    await workspace.postFromHuman(EXEC, 'U_EXEC', 'Confidential exec note.');
+
+    const strategistExecHistory = await strategist.conversationHistory.get(EXEC);
+    expect(strategistExecHistory.length).toBeGreaterThan(0);
+  });
+});
+
+// ─── Goal 7: Full end-to-end multi-agent workflow ────────────────────────────
+
+describe('Goal 7 — full end-to-end workflow', () => {
+  it('human → Strategist → Lead delegates → synthesis → QA DM all produce correct outputs', async () => {
+    // Step 1: Human posts feature request in #team
+    await workspace.postFromHuman(
+      TEAM,
+      'U_HUMAN',
+      'We need a new dashboard for client reporting. @strategist thoughts?',
+    );
+
+    // Step 2: Human asks Lead to scope in the same channel
+    await workspace.postFromHuman(TEAM, 'U_HUMAN', 'Please scope the dashboard work.');
+
+    // Step 3: Human DMs QA
+    await workspace.postDM(QA_DM, 'U_HUMAN', 'Review acceptance criteria for the dashboard.');
+
+    // Assert Strategist replied in #team
+    const strategistPosts = workspace.postsFrom('strategist-slack');
+    expect(strategistPosts.some(p => p.channelId === TEAM && p.text.includes('Strategic take'))).toBe(true);
+
+    // Assert Lead posted synthesis in #team (no DMs — delegations are local)
+    const leadPosts = workspace.postsFrom('lead-slack');
+    expect(leadPosts.some(p => p.channelId === TEAM && p.text.includes('Plan:'))).toBe(true);
+
+    // Assert QA replied in DM
+    const qaPosts = workspace.postsFrom('qa-slack');
+    expect(qaPosts.some(p => p.text.includes('QA review'))).toBe(true);
+
+    // Assert delegation exchange recorded in Frontend store
+    const frontendDelegationHistory = await frontend.conversationHistory.get(TEAM);
+    expect(frontendDelegationHistory.some(t => t.content.includes('component list') || t.participant.id === 'Lead')).toBe(true);
+
+    // Assert Backend delegation exchange recorded in Backend store
+    const backendDelegationHistory = await backend.conversationHistory.get(TEAM);
+    expect(backendDelegationHistory.some(t => t.content.includes('endpoints') || t.participant.id === 'Lead')).toBe(true);
+
+    // Assert per-agent isolation: Strategist store has no Frontend/Backend content
+    const strategistFull = await strategist.conversationHistory.get(TEAM);
+    expect(strategistFull.some(t => t.participant.id === 'Frontend' || t.participant.id === 'Backend')).toBe(false);
+  });
+});
diff --git a/packages/toolpack-agents/tsconfig.json b/packages/toolpack-agents/tsconfig.json
new file mode 100644
index 0000000..8b411f1
--- /dev/null
+++ b/packages/toolpack-agents/tsconfig.json
@@ -0,0 +1,9 @@
+{
+  "extends": "../../tsconfig.json",
+  "compilerOptions": {
+    "outDir": "./dist",
+    "rootDir": "./src"
+  },
+  "include": ["src/**/*"],
+  "exclude": ["node_modules", "dist", "**/*.test.ts"]
+}
diff --git a/packages/toolpack-agents/tsup.config.ts b/packages/toolpack-agents/tsup.config.ts
new file mode 100644
index 0000000..21a07e7
--- /dev/null
+++ b/packages/toolpack-agents/tsup.config.ts
@@ -0,0 +1,30 @@
+import { defineConfig } from 'tsup';
+import { createRequire } from 'module';
+const require = createRequire(import.meta.url);
+const pkg = require('./package.json');
+
+export default defineConfig({
+  entry: {
+    index: 'src/index.ts',
+    'channels/index': 'src/channels/index.ts',
+    'testing/index': 'src/testing/index.ts',
+    'registry/index': 'src/registry/index.ts',
+    'capabilities/index': 'src/capabilities/index.ts',
+    'interceptors/index': 'src/interceptors/index.ts',
+  },
+  dts: true,
+  format: ['esm', 'cjs'],
+  splitting: false,
+  sourcemap: false,
+  clean: true,
+  outDir: 'dist',
+  outExtension({ format }) {
+    return { js: format === 'esm' ? '.js' : '.cjs' };
+  },
+  external: Object.keys(pkg.peerDependencies || {}),
+  shims: true,
+  esbuildOptions(options) {
+    options.platform = 'node';
+  },
+  minify: true,
+});
diff --git a/packages/toolpack-agents/vitest.config.ts b/packages/toolpack-agents/vitest.config.ts
new file mode 100644
index 0000000..f168127
--- /dev/null
+++ b/packages/toolpack-agents/vitest.config.ts
@@ -0,0 +1,9 @@
+import { defineConfig } from 'vitest/config';
+
+export default defineConfig({
+  test: {
+    include: ['src/**/*.test.ts', 'tests/**/*.test.ts'],
+    exclude: ['node_modules', 'dist'],
+    fileParallelism: false,
+  },
+});
diff --git a/packages/toolpack-knowledge/README.md b/packages/toolpack-knowledge/README.md
index bbf92fe..92cc81c 100644
--- a/packages/toolpack-knowledge/README.md
+++ b/packages/toolpack-knowledge/README.md
@@ -122,6 +122,8 @@ const webSource = new WebUrlSource(['https://docs.example.com'], {
   userAgent: 'MyApp/1.0',         // Custom user agent
   maxChunkSize: 1500,             // Chunk size for web content
   timeoutMs: 30000,               // Request timeout
+  sameDomainOnly: true,           // Only follow links on the same domain (default: true)
+  maxPagesPerDomain: 20,          // Cap pages per domain (default: 10)
 });
 
 const kb = await Knowledge.create({
@@ -285,6 +287,8 @@ new WebUrlSource(['https://example.com', 'https://docs.example.com'], {
   maxChunkSize: 2000,             // Max tokens per chunk
   chunkOverlap: 200,              // Overlap between chunks
   timeoutMs: 30000,               // Request timeout (default: 30000ms)
+  sameDomainOnly: true,           // Only follow links on the same domain (default: true)
+  maxPagesPerDomain: 10,          // Max pages crawled per domain (default: 10)
   namespace: 'web',               // Chunk ID prefix
   metadata: { source: 'web' },    // Added to all chunks
 })
@@ -337,6 +341,67 @@ new ApiDataSource('https://api.example.com/data', {
 - JSON path support
 - Flexible content transformation
 
+### JSONSource
+
+Index data from local JSON files.
+
+```typescript
+import { JSONSource } from '@toolpack-sdk/knowledge';
+
+new JSONSource('./data/products.json', {
+  toContent: (item: any) => `${item.name}\n\n${item.description}`,  // Required
+  filter: (item: any) => item.active === true,                       // Optional: filter items
+  chunkSize: 100,                                                     // Items per chunk (default: 100)
+  namespace: 'products',
+  metadata: { source: 'products-db' },
+})
+```
+
+**Features:**
+- Parses JSON arrays (or single objects)
+- Optional item-level filtering
+- Required `toContent` callback to control what gets embedded
+
+### SQLiteSource
+
+Index rows from a SQLite database. Requires `better-sqlite3`.
+
+```typescript
+import { SQLiteSource } from '@toolpack-sdk/knowledge';
+
+new SQLiteSource('./data/app.db', {
+  query: 'SELECT id, title, body FROM articles WHERE published = 1',  // Optional: defaults to all rows
+  toContent: (row) => `${row.title}\n\n${row.body}`,                  // Required
+  chunkSize: 50,                                                        // Rows per chunk (default: 100)
+  namespace: 'articles',
+  metadata: { source: 'sqlite' },
+  preLoadCSV: {                   // Optional: load a CSV into the DB before querying
+    tableName: 'articles',
+    csvPath: './data/articles.csv',
+    delimiter: ',',
+    headers: true,
+  },
+})
+```
+
+### PostgresSource
+
+Index rows from a PostgreSQL database. Requires `pg`.
+
+```typescript
+import { PostgresSource } from '@toolpack-sdk/knowledge';
+
+new PostgresSource({
+  connectionString: process.env.DATABASE_URL,  // or use host/port/database/user/password
+  query: 'SELECT id, title, content FROM docs WHERE status = $1',
+  toContent: (row) => `${row.title}\n\n${row.content}`,  // Required
+  chunkSize: 50,
+  namespace: 'docs',
+  metadata: { source: 'postgres' },
+  ssl: true,
+})
+```
+
 ## Embedders
 
 ### OllamaEmbedder
@@ -345,11 +410,34 @@ Local embeddings via Ollama. Zero API cost.
 
 ```typescript
 new OllamaEmbedder({
-  model: 'nomic-embed-text',           // or 'mxbai-embed-large'
+  model: 'nomic-embed-text',           // or 'mxbai-embed-large', 'all-minilm', 'bge-m3', etc.
   baseUrl: 'http://localhost:11434',   // default
+  dimensions: 768,                     // optional: override auto-detected dimensions
+  retries: 3,                          // default
+  retryDelay: 1000,                    // ms, default
+})
+```
+
+Known models: `nomic-embed-text` (768), `mxbai-embed-large` (1024), `all-minilm` (384), `snowflake-arctic-embed` (1024), `bge-m3` (1024), `bge-large` (1024). Pass `dimensions` for any other model.
+
+### OpenRouterEmbedder
+
+Embeddings via OpenRouter, giving access to OpenAI embedding models through a single API key.
+
+```typescript
+import { OpenRouterEmbedder } from '@toolpack-sdk/knowledge';
+
+new OpenRouterEmbedder({
+  model: 'openai/text-embedding-3-small',  // or 'openai/text-embedding-3-large', 'openai/text-embedding-ada-002'
+  apiKey: process.env.OPENROUTER_API_KEY!,
+  dimensions: 1536,                         // optional: override auto-detected dimensions
+  retries: 3,                               // default
+  retryDelay: 1000,                         // ms, default
 })
 ```
 
+Known models: `openai/text-embedding-3-small` (1536), `openai/text-embedding-3-large` (3072), `openai/text-embedding-ada-002` (1536). Pass `dimensions` for any other model.
+
 ### OpenAIEmbedder
 
 OpenAI text-embedding models with retry logic.
diff --git a/packages/toolpack-knowledge/src/__tests__/json-source.test.ts b/packages/toolpack-knowledge/src/__tests__/json-source.test.ts
new file mode 100644
index 0000000..1b8d243
--- /dev/null
+++ b/packages/toolpack-knowledge/src/__tests__/json-source.test.ts
@@ -0,0 +1,143 @@
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import * as fs from 'fs/promises';
+import * as path from 'path';
+import * as os from 'os';
+import { JSONSource } from '../sources/json.js';
+
+const defaultToContent = (item: unknown) =>
+  typeof item === 'object' && item !== null
+    ? (item as { name?: string }).name ?? JSON.stringify(item)
+    : String(item);
+
+describe('JSONSource', () => {
+  let tempDir: string;
+  let testFile: string;
+
+  beforeAll(async () => {
+    tempDir = await fs.mkdtemp(path.join(os.tmpdir(), 'json-source-test-'));
+  });
+
+  afterAll(async () => {
+    await fs.rm(tempDir, { recursive: true, force: true });
+  });
+
+  describe('constructor', () => {
+    it('should throw if toContent is not provided', () => {
+      expect(() => {
+        new JSONSource('/path/to/file.json', {} as { toContent: (item: unknown) => string });
+      }).toThrow('JSONSource requires a toContent callback');
+    });
+  });
+
+  describe('load', () => {
+    it('should load single object from JSON file', async () => {
+      testFile = path.join(tempDir, 'single.json');
+      await fs.writeFile(testFile, JSON.stringify({ name: 'Test', value: 42 }));
+
+      const source = new JSONSource(testFile, {
+        toContent: (item) => `Name: ${(item as { name: string }).name}, Value: ${(item as { value: number }).value}`,
+      });
+      const chunks: Awaited<ReturnType<typeof source.load.next>>[] = [];
+
+      for await (const chunk of source.load()) {
+        chunks.push({ value: chunk, done: false } as const);
+      }
+
+      expect(chunks).toHaveLength(1);
+      expect(chunks[0].value.content).toContain('Name: Test');
+      expect(chunks[0].value.content).toContain('Value: 42');
+      expect(chunks[0].value.metadata.type).toBe('json_object');
+    });
+
+    it('should load and chunk array from JSON file', async () => {
+      testFile = path.join(tempDir, 'array.json');
+      const data = Array.from({ length: 10 }, (_, i) => ({ id: i, name: `Item ${i}` }));
+      await fs.writeFile(testFile, JSON.stringify(data));
+
+      const source = new JSONSource(testFile, {
+        chunkSize: 3,
+        toContent: (item) => `ID: ${(item as { id: number }).id}, Name: ${(item as { name: string }).name}`,
+      });
+      const chunks: Awaited<ReturnType<typeof source.load.next>>[] = [];
+
+      for await (const chunk of source.load()) {
+        chunks.push({ value: chunk, done: false } as const);
+      }
+
+      expect(chunks).toHaveLength(4); // 3+3+3+1
+      expect(chunks[0].value.metadata.totalItems).toBe(10);
+      expect(chunks[0].value.metadata.startIndex).toBe(0);
+      expect(chunks[0].value.metadata.endIndex).toBe(3);
+      expect(chunks[0].value.content).toContain('ID: 0, Name: Item 0');
+    });
+
+    it('should apply filter to array data', async () => {
+      testFile = path.join(tempDir, 'filtered.json');
+      const data = [
+        { id: 1, active: true },
+        { id: 2, active: false },
+        { id: 3, active: true },
+      ];
+      await fs.writeFile(testFile, JSON.stringify(data));
+
+      const source = new JSONSource(testFile, {
+        filter: (item: unknown) => (item as { active: boolean }).active,
+        toContent: (item) => `ID: ${(item as { id: number }).id}, Active: ${(item as { active: boolean }).active}`,
+      });
+      const chunks: Awaited<ReturnType<typeof source.load.next>>[] = [];
+
+      for await (const chunk of source.load()) {
+        chunks.push({ value: chunk, done: false } as const);
+      }
+
+      expect(chunks).toHaveLength(1);
+      expect(chunks[0].value.content).toContain('ID: 1, Active: true');
+      expect(chunks[0].value.content).toContain('ID: 3, Active: true');
+      expect(chunks[0].value.metadata.totalItems).toBe(2);
+    });
+
+    it('should include custom metadata', async () => {
+      testFile = path.join(tempDir, 'meta.json');
+      await fs.writeFile(testFile, JSON.stringify({ test: true }));
+
+      const source = new JSONSource(testFile, {
+        namespace: 'custom-ns',
+        metadata: { project: 'test', version: 1 },
+        toContent: (item) => `Test: ${(item as { test: boolean }).test}`,
+      });
+      const chunks: Awaited<ReturnType<typeof source.load.next>>[] = [];
+
+      for await (const chunk of source.load()) {
+        chunks.push({ value: chunk, done: false } as const);
+      }
+
+      expect(chunks[0].value.id).toBe('json:custom-ns:0');
+      expect(chunks[0].value.content).toBe('Test: true');
+      expect(chunks[0].value.metadata.project).toBe('test');
+      expect(chunks[0].value.metadata.version).toBe(1);
+    });
+
+    it('should throw on invalid JSON', async () => {
+      testFile = path.join(tempDir, 'invalid.json');
+      await fs.writeFile(testFile, 'not valid json');
+
+      const source = new JSONSource(testFile, { toContent: defaultToContent });
+      await expect(async () => {
+        // eslint-disable-next-line @typescript-eslint/no-unused-vars
+        for await (const _ of source.load()) {
+          // consume
+        }
+      }).rejects.toThrow('Failed to parse JSON file');
+    });
+
+    it('should throw on missing file', async () => {
+      const source = new JSONSource('/nonexistent/path/file.json', { toContent: defaultToContent });
+      await expect(async () => {
+        // eslint-disable-next-line @typescript-eslint/no-unused-vars
+        for await (const _ of source.load()) {
+          // consume
+        }
+      }).rejects.toThrow();
+    });
+  });
+});
diff --git a/packages/toolpack-knowledge/src/__tests__/keyword.test.ts b/packages/toolpack-knowledge/src/__tests__/keyword.test.ts
index f0a115d..085c9a8 100644
--- a/packages/toolpack-knowledge/src/__tests__/keyword.test.ts
+++ b/packages/toolpack-knowledge/src/__tests__/keyword.test.ts
@@ -1,5 +1,5 @@
 import { describe, it, expect } from 'vitest';
-import { keywordSearch, combineScores } from '../../dist/index.js';
+import { keywordSearch, combineScores } from '../utils/keyword.js';
 
 describe('keywordSearch', () => {
   it('should return 1.0 for exact matches', () => {
diff --git a/packages/toolpack-knowledge/src/__tests__/knowledge.test.ts b/packages/toolpack-knowledge/src/__tests__/knowledge.test.ts
index 319f769..4888561 100644
--- a/packages/toolpack-knowledge/src/__tests__/knowledge.test.ts
+++ b/packages/toolpack-knowledge/src/__tests__/knowledge.test.ts
@@ -302,4 +302,65 @@ describe('Knowledge', () => {
       expect(results.length).toBe(2);
     });
   });
+
+  describe('add', () => {
+    it('should add single content with metadata', async () => {
+      const kb = await Knowledge.create({
+        provider,
+        sources: [],
+        embedder: createMockEmbedder(),
+        description: 'Test',
+      });
+
+      const id = await kb.add('Test conversation message', {
+        role: 'user',
+        conversationId: 'conv-123',
+        timestamp: new Date().toISOString(),
+      });
+
+      expect(id).toBeDefined();
+      expect(typeof id).toBe('string');
+    });
+
+    it('should add content without metadata', async () => {
+      const kb = await Knowledge.create({
+        provider,
+        sources: [],
+        embedder: createMockEmbedder(),
+        description: 'Test',
+      });
+
+      const id = await kb.add('Simple content');
+
+      expect(id).toBeDefined();
+      expect(typeof id).toBe('string');
+    });
+
+    it('should throw on embedder failure', async () => {
+      const failingEmbedder = createMockEmbedder();
+      failingEmbedder.embed = vi.fn().mockRejectedValue(new Error('Embedding failed'));
+
+      const kb = await Knowledge.create({
+        provider,
+        sources: [],
+        embedder: failingEmbedder,
+        description: 'Test',
+      });
+
+      await expect(kb.add('Test content')).rejects.toThrow('Failed to add content');
+    });
+
+    it('should throw on provider failure', async () => {
+      provider.add = vi.fn().mockRejectedValue(new Error('Provider error'));
+
+      const kb = await Knowledge.create({
+        provider,
+        sources: [],
+        embedder: createMockEmbedder(),
+        description: 'Test',
+      });
+
+      await expect(kb.add('Test content')).rejects.toThrow('Failed to add content');
+    });
+  });
 });
diff --git a/packages/toolpack-knowledge/src/__tests__/postgres-source.test.ts b/packages/toolpack-knowledge/src/__tests__/postgres-source.test.ts
new file mode 100644
index 0000000..28903d6
--- /dev/null
+++ b/packages/toolpack-knowledge/src/__tests__/postgres-source.test.ts
@@ -0,0 +1,78 @@
+import { describe, it, expect, vi } from 'vitest';
+import { PostgresSource } from '../sources/postgres.js';
+
+const defaultToContent = (row: Record<string, unknown>) =>
+  Object.entries(row).map(([k, v]) => `${k}: ${v}`).join(', ');
+
+describe('PostgresSource', () => {
+  describe('constructor', () => {
+    it('should create with connection string and toContent', () => {
+      const source = new PostgresSource({
+        query: 'SELECT * FROM users',
+        connectionString: 'postgresql://user:pass@localhost/db',
+        toContent: defaultToContent,
+      });
+      expect(source).toBeDefined();
+    });
+
+    it('should create with individual config options and toContent', () => {
+      const source = new PostgresSource({
+        query: 'SELECT * FROM users',
+        host: 'localhost',
+        port: 5432,
+        database: 'mydb',
+        user: 'admin',
+        password: 'secret',
+        toContent: defaultToContent,
+      });
+      expect(source).toBeDefined();
+    });
+
+    it('should throw without query', () => {
+      expect(() => {
+        new PostgresSource({ toContent: defaultToContent } as { query: string; toContent: (row: Record<string, unknown>) => string });
+      }).toThrow('PostgresSource requires a query');
+    });
+
+    it('should throw without toContent', () => {
+      expect(() => {
+        new PostgresSource({ query: 'SELECT 1' } as { query: string; toContent: (row: Record<string, unknown>) => string });
+      }).toThrow('PostgresSource requires a toContent callback');
+    });
+
+    it('should use default values', () => {
+      const source = new PostgresSource({
+        query: 'SELECT 1',
+        database: 'test',
+        user: 'test',
+        password: 'test',
+        toContent: defaultToContent,
+      });
+      expect(source).toBeDefined();
+    });
+  });
+
+  describe('load', () => {
+    it('should throw if pg package is not installed', async () => {
+      // Mock the import to throw
+      vi.doMock('pg', () => {
+        throw new Error('Module not found');
+      });
+
+      const source = new PostgresSource({
+        query: 'SELECT * FROM test',
+        connectionString: 'postgresql://localhost/test',
+        toContent: defaultToContent,
+      });
+
+      await expect(async () => {
+        // eslint-disable-next-line @typescript-eslint/no-unused-vars
+        for await (const _ of source.load()) {
+          // consume
+        }
+      }).rejects.toThrow('requires "pg" package');
+
+      vi.doUnmock('pg');
+    });
+  });
+});
diff --git a/packages/toolpack-knowledge/src/__tests__/sqlite-source.test.ts b/packages/toolpack-knowledge/src/__tests__/sqlite-source.test.ts
new file mode 100644
index 0000000..b719b2b
--- /dev/null
+++ b/packages/toolpack-knowledge/src/__tests__/sqlite-source.test.ts
@@ -0,0 +1,89 @@
+import { describe, it, expect } from 'vitest';
+import { SQLiteSource } from '../sources/sqlite.js';
+
+const defaultToContent = (row: Record<string, unknown>) =>
+  Object.entries(row).map(([k, v]) => `${k}: ${v}`).join(', ');
+
+describe('SQLiteSource', () => {
+  describe('constructor', () => {
+    it('should throw if toContent is not provided', () => {
+      expect(() => {
+        new SQLiteSource('/path/to/db.sqlite', {} as { toContent: (row: Record<string, unknown>) => string });
+      }).toThrow('SQLiteSource requires a toContent callback');
+    });
+
+    it('should create with database path and toContent', () => {
+      const source = new SQLiteSource('/path/to/db.sqlite', {
+        toContent: defaultToContent,
+      });
+      expect(source).toBeDefined();
+    });
+
+    it('should create with options', () => {
+      const source = new SQLiteSource('/path/to/db.sqlite', {
+        namespace: 'myapp',
+        query: 'SELECT * FROM users',
+        chunkSize: 50,
+        metadata: { version: 1 },
+        toContent: defaultToContent,
+      });
+      expect(source).toBeDefined();
+    });
+  });
+
+  describe('load', () => {
+    it('should throw if better-sqlite3 is not installed', async () => {
+      const source = new SQLiteSource('/path/to/db.sqlite', {
+        toContent: defaultToContent,
+      });
+
+      // This will fail if better-sqlite3 is not installed
+      // The error should be about the package not being found
+      await expect(async () => {
+        // eslint-disable-next-line @typescript-eslint/no-unused-vars
+        for await (const _ of source.load()) {
+          // consume
+        }
+      }).rejects.toThrow();
+    });
+
+    it('should throw on non-existent database file', async () => {
+      const source = new SQLiteSource('/nonexistent/path/db.sqlite', {
+        toContent: defaultToContent,
+      });
+
+      await expect(async () => {
+        // eslint-disable-next-line @typescript-eslint/no-unused-vars
+        for await (const _ of source.load()) {
+          // consume
+        }
+      }).rejects.toThrow('SQLite database file not found');
+    });
+  });
+
+  describe('loadCSV', () => {
+    it('should validate preLoadCSV config structure', () => {
+      const source = new SQLiteSource('/path/to/db.sqlite', {
+        toContent: defaultToContent,
+        preLoadCSV: {
+          tableName: 'users',
+          csvPath: '/path/to/data.csv',
+        },
+      });
+      expect(source).toBeDefined();
+    });
+
+    it('should accept CSV with custom delimiter', () => {
+      const source = new SQLiteSource('/path/to/db.sqlite', {
+        toContent: defaultToContent,
+        preLoadCSV: {
+          tableName: 'users',
+          csvPath: '/path/to/data.tsv',
+          delimiter: '\t',
+          headers: true,
+        },
+      });
+      expect(source).toBeDefined();
+    });
+  });
+});
diff --git a/packages/toolpack-knowledge/src/embedders/openrouter.ts b/packages/toolpack-knowledge/src/embedders/openrouter.ts
new file mode 100644
index 0000000..8066f2d
--- /dev/null
+++ b/packages/toolpack-knowledge/src/embedders/openrouter.ts
@@ -0,0 +1,91 @@
+import OpenAI from 'openai';
+import { Embedder } from '../interfaces.js';
+import { EmbeddingError } from '../errors.js';
+
+const OPENROUTER_BASE_URL = 'https://openrouter.ai/api/v1';
+
+export interface OpenRouterEmbedderOptions {
+  model: string;
+  apiKey: string;
+  /** Override output dimensions for models not in the built-in map */
+  dimensions?: number;
+  retries?: number;
+  retryDelay?: number;
+  timeout?: number;
+}
+
+export class OpenRouterEmbedder implements Embedder {
+  readonly dimensions: number;
+  private client: OpenAI;
+
+  constructor(private options: OpenRouterEmbedderOptions) {
+    this.client = new OpenAI({
+      apiKey: options.apiKey,
+      baseURL: OPENROUTER_BASE_URL,
+      timeout: options.timeout || 30000,
+    });
+    this.dimensions = options.dimensions ?? this.getModelDimensions(options.model);
+  }
+
+  private getModelDimensions(model: string): number {
+    const dimensionsMap: Record<string, number> = {
+      'nvidia/llama-nemotron-embed-vl-1b-v2': 4096,
+      'nvidia/llama-nemotron-embed-vl-1b-v2:free': 4096,
+      'openai/text-embedding-3-small': 1536,
+      'openai/text-embedding-3-large': 3072,
+      'openai/text-embedding-ada-002': 1536,
+    };
+    const dims = dimensionsMap[model];
+    if (dims === undefined) {
+      throw new EmbeddingError(
+        `Unknown OpenRouter embedding model '${model}'. Pass 'dimensions' in OpenRouterEmbedderOptions ` +
+        `or use a known model: ${Object.keys(dimensionsMap).join(', ')}`
+      );
+    }
+    return dims;
+  }
+
+  async embed(text: string): Promise<number[]> {
+    let lastError: Error | null = null;
+    const retries = this.options.retries ?? 3;
+
+    for (let attempt = 0; attempt < retries; attempt++) {
+      try {
+        const response = await this.client.embeddings.create({
+          model: this.options.model,
+          input: text,
+        });
+        return response.data[0].embedding;
+      } catch (error) {
+        lastError = error as Error;
+        if (attempt < retries - 1) {
+          await new Promise(resolve => setTimeout(resolve, this.options.retryDelay ?? 1000));
+        }
+      }
+    }
+
+    throw new EmbeddingError(`OpenRouter embedding failed after ${retries} retries: ${lastError?.message}`);
+  }
+
+  async embedBatch(texts: string[]): Promise<number[][]> {
+    let lastError: Error | null = null;
+    const retries = this.options.retries ?? 3;
+
+    for (let attempt = 0; attempt < retries; attempt++) {
+      try {
+        const response = await this.client.embeddings.create({
+          model: this.options.model,
+          input: texts,
+        });
+        return response.data.map(d => d.embedding);
+      } catch (error) {
+        lastError = error as Error;
+        if (attempt < retries - 1) {
+          await new Promise(resolve => setTimeout(resolve, this.options.retryDelay ?? 1000));
+        }
+      }
+    }
+
+    throw new EmbeddingError(`OpenRouter batch embedding failed after ${retries} retries: ${lastError?.message}`);
+  }
+}
diff --git a/packages/toolpack-knowledge/src/index.ts b/packages/toolpack-knowledge/src/index.ts
index 13a0ef3..2e7eeef 100644
--- a/packages/toolpack-knowledge/src/index.ts
+++ b/packages/toolpack-knowledge/src/index.ts
@@ -17,11 +17,23 @@ export type { WebUrlSourceOptions } from './sources/web-url.js';
 export { ApiDataSource } from './sources/api.js';
 export type { ApiDataSourceOptions } from './sources/api.js';
 
+export { JSONSource } from './sources/json.js';
+export type { JSONSourceOptions } from './sources/json.js';
+
+export { SQLiteSource } from './sources/sqlite.js';
+export type { SQLiteSourceOptions } from './sources/sqlite.js';
+
+export { PostgresSource } from './sources/postgres.js';
+export type { PostgresSourceOptions } from './sources/postgres.js';
+
 export { OllamaEmbedder } from './embedders/ollama.js';
 export type { OllamaEmbedderOptions } from './embedders/ollama.js';
 
 export { OpenAIEmbedder } from './embedders/openai.js';
 export type { OpenAIEmbedderOptions } from './embedders/openai.js';
 
+export { OpenRouterEmbedder } from './embedders/openrouter.js';
+export type { OpenRouterEmbedderOptions } from './embedders/openrouter.js';
+
 // Utility functions
 export { keywordSearch, combineScores } from './utils/keyword.js';
diff --git a/packages/toolpack-knowledge/src/knowledge.ts b/packages/toolpack-knowledge/src/knowledge.ts
index 13790bd..031575e 100644
--- a/packages/toolpack-knowledge/src/knowledge.ts
+++ b/packages/toolpack-knowledge/src/knowledge.ts
@@ -1,6 +1,8 @@
+import { randomUUID } from 'crypto';
 import { KnowledgeProvider, KnowledgeSource, Embedder, QueryOptions, QueryResult, Chunk } from './interfaces.js';
 import { keywordSearch, combineScores } from './utils/keyword.js';
 import { matchesFilter } from './utils/cosine.js';
+import { IngestionError } from './errors.js';
 
 export interface KnowledgeOptions {
   provider: KnowledgeProvider;
@@ -297,6 +299,40 @@ export class Knowledge {
     return embeddedChunks;
   }
 
+  /**
+   * Add a single content item to the knowledge base without triggering a full re-sync.
+   * This is useful for runtime additions like conversation history or agent state.
+   * @param content The text content to add
+   * @param metadata Optional metadata to attach to the chunk
+   * @returns The ID of the added chunk
+   */
+  async add(content: string, metadata?: Record<string, unknown>): Promise<string> {
+    try {
+      const id = randomUUID();
+
+      // Embed the content
+      const vector = await this.embedder.embed(content);
+
+      // Create the chunk
+      const chunk: Chunk = {
+        id,
+        content,
+        metadata: metadata || {},
+        vector,
+      };
+
+      // Add to provider
+      await this.provider.add([chunk]);
+
+      return id;
+    } catch (error) {
+      throw new IngestionError(
+        `Failed to add content to knowledge base: ${(error as Error).message}`,
+        'add'
+      );
+    }
+  }
+
   async stop(): Promise<void> {
     if (this.provider.close) {
       this.provider.close();
diff --git a/packages/toolpack-knowledge/src/sources/json.ts b/packages/toolpack-knowledge/src/sources/json.ts
new file mode 100644
index 0000000..396ed96
--- /dev/null
+++ b/packages/toolpack-knowledge/src/sources/json.ts
@@ -0,0 +1,98 @@
+import * as fs from 'fs/promises';
+import * as path from 'path';
+import { KnowledgeSource, Chunk } from '../interfaces.js';
+import { IngestionError } from '../errors.js';
+
+export interface JSONSourceOptions {
+  namespace?: string;
+  metadata?: Record<string, unknown>;
+  filter?: (item: unknown) => boolean;
+  chunkSize?: number;
+  /** Required. Transform each JSON item into a human-readable string for AI embedding. */
+  toContent: (item: unknown) => string;
+}
+
+/**
+ * Knowledge source for JSON files.
+ * Supports jq-like filtering and chunking of large arrays.
+ */
+export class JSONSource implements KnowledgeSource {
+  private options: Required<JSONSourceOptions>;
+
+  constructor(
+    private filePath: string,
+    options: JSONSourceOptions
+  ) {
+    if (!options.toContent) {
+      throw new IngestionError(
+        'JSONSource requires a toContent callback. Example: toContent: (item) => `Name: ${item.name}`',
+        this.filePath
+      );
+    }
+    this.options = {
+      namespace: options.namespace ?? 'json',
+      metadata: options.metadata ?? {},
+      filter: options.filter ?? (() => true),
+      chunkSize: options.chunkSize ?? 100,
+      toContent: options.toContent,
+    };
+  }
+
+  async *load(): AsyncIterable<Chunk> {
+    let data: unknown;
+
+    try {
+      const content = await fs.readFile(this.filePath, 'utf-8');
+      data = JSON.parse(content);
+    } catch (error) {
+      throw new IngestionError(
+        `Failed to parse JSON file: ${(error as Error).message}`,
+        this.filePath
+      );
+    }
+
+    // Handle array data with optional filtering
+    if (Array.isArray(data)) {
+      const filtered = data.filter(this.options.filter);
+      
+      // Transform each item using toContent and join
+      const contentItems = filtered.map(this.options.toContent);
+      
+      // Chunk large arrays
+      for (let i = 0; i < contentItems.length; i += this.options.chunkSize) {
+        const chunkItems = contentItems.slice(i, i + this.options.chunkSize);
+        const chunkContent = chunkItems.join('\n\n---\n\n');
+        
+        yield {
+          id: `json:${this.options.namespace}:${i}`,
+          content: chunkContent,
+          metadata: {
+            ...this.options.metadata,
+            source: path.basename(this.filePath),
+            type: 'json_array_chunk',
+            startIndex: i,
+            endIndex: Math.min(i + this.options.chunkSize, contentItems.length),
+            totalItems: contentItems.length,
+          },
+        };
+      }
+    } else {
+      // Single object - use toContent if it's an object
+      const content = typeof data === 'object' && data !== null
+        ? this.options.toContent(data)
+        : typeof data === 'string'
+          ? data
+          : JSON.stringify(data);
+      
+      yield {
+        id: `json:${this.options.namespace}:0`,
+        content,
+        metadata: {
+          ...this.options.metadata,
+          source: path.basename(this.filePath),
+          type: 'json_object',
+        },
+      };
+    }
+  }
+}
diff --git a/packages/toolpack-knowledge/src/sources/postgres.ts b/packages/toolpack-knowledge/src/sources/postgres.ts
new file mode 100644
index 0000000..f1bf0c9
--- /dev/null
+++ b/packages/toolpack-knowledge/src/sources/postgres.ts
@@ -0,0 +1,118 @@
+import { KnowledgeSource, Chunk } from '../interfaces.js';
+import { IngestionError } from '../errors.js';
+
+export interface PostgresSourceOptions {
+  namespace?: string;
+  metadata?: Record<string, unknown>;
+  query: string;
+  chunkSize?: number;
+  /** Required. Transform each database row into a human-readable string for AI embedding. */
+  toContent: (row: Record<string, unknown>) => string;
+  connectionString?: string;
+  host?: string;
+  port?: number;
+  database?: string;
+  user?: string;
+  password?: string;
+  ssl?: boolean;
+}
+
+/**
+ * Knowledge source for PostgreSQL databases.
+ * Supports SQL queries with optional chunking.
+ * Note: This requires the 'pg' package to be installed.
+ */
+export class PostgresSource implements KnowledgeSource {
+  private options: Required<Pick<PostgresSourceOptions, 'namespace' | 'metadata' | 'chunkSize' | 'toContent'>> &
+    Pick<PostgresSourceOptions, 'query' | 'connectionString' | 'host' | 'port' | 'database' | 'user' | 'password' | 'ssl'>;
+
+  constructor(options: PostgresSourceOptions) {
+    if (!options.query) {
+      throw new IngestionError('PostgresSource requires a query', 'config');
+    }
+    if (!options.toContent) {
+      throw new IngestionError(
+        'PostgresSource requires a toContent callback. Example: toContent: (row) => `Name: ${row.name}`',
+        'config'
+      );
+    }
+
+    this.options = {
+      namespace: options.namespace ?? 'postgres',
+      metadata: options.metadata ?? {},
+      chunkSize: options.chunkSize ?? 100,
+      toContent: options.toContent,
+      query: options.query,
+      connectionString: options.connectionString,
+      host: options.host,
+      port: options.port,
+      database: options.database,
+      user: options.user,
+      password: options.password,
+      ssl: options.ssl,
+    };
+  }
+
+  async *load(): AsyncIterable<Chunk> {
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    let Client: any;
+    
+    try {
+      // Dynamic import to avoid hard dependency
+      const pg = await import('pg');
+      Client = pg.Client;
+    } catch {
+      throw new IngestionError(
+        'PostgreSQL source requires "pg" package. Install with: npm install pg',
+        'config'
+      );
+    }
+
+    // Build connection config
+    const clientConfig = this.options.connectionString
+      ? { connectionString: this.options.connectionString }
+      : {
+          host: this.options.host ?? 'localhost',
+          port: this.options.port ?? 5432,
+          database: this.options.database,
+          user: this.options.user,
+          password: this.options.password,
+          ssl: this.options.ssl,
+        };
+
+    const client = new Client(clientConfig);
+
+    try {
+      await client.connect();
+
+      // Execute query
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const result = await client.query(this.options.query);
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      const rows = result.rows as Array<Record<string, unknown>>;
+
+      // Transform each row using toContent and chunk
+      const contentItems = rows.map((row) => this.options.toContent(row));
+      
+      for (let i = 0; i < contentItems.length; i += this.options.chunkSize) {
+        const chunkItems = contentItems.slice(i, i + this.options.chunkSize);
+        const chunkContent = chunkItems.join('\n\n---\n\n');
+        
+        yield {
+          id: `postgres:${this.options.namespace}:${i}`,
+          content: chunkContent,
+          metadata: {
+            ...this.options.metadata,
+            type: 'postgres_query_result',
+            query: this.options.query,
+            startIndex: i,
+            endIndex: Math.min(i + this.options.chunkSize, contentItems.length),
+            totalRows: contentItems.length,
+          },
+        };
+      }
+    } finally {
+      await client.end();
+    }
+  }
+}
diff --git a/packages/toolpack-knowledge/src/sources/sqlite.ts b/packages/toolpack-knowledge/src/sources/sqlite.ts
new file mode 100644
index 0000000..dda1bf1
--- /dev/null
+++ b/packages/toolpack-knowledge/src/sources/sqlite.ts
@@ -0,0 +1,153 @@
+import * as fs from 'fs/promises';
+import * as path from 'path';
+import { KnowledgeSource, Chunk } from '../interfaces.js';
+import { IngestionError } from '../errors.js';
+
+export interface SQLiteSourceOptions {
+  namespace?: string;
+  metadata?: Record<string, unknown>;
+  query?: string;
+  chunkSize?: number;
+  /** Required. Transform each database row into a human-readable string for AI embedding. */
+  toContent: (row: Record<string, unknown>) => string;
+  preLoadCSV?: {
+    tableName: string;
+    csvPath: string;
+    delimiter?: string;
+    headers?: boolean;
+  };
+}
+
+/**
+ * Knowledge source for SQLite databases.
+ * Supports SQL queries and optional CSV/TSV pre-loading.
+ * Note: This requires the 'better-sqlite3' package to be installed.
+ */
+export class SQLiteSource implements KnowledgeSource {
+  private options: Required<Pick<SQLiteSourceOptions, 'namespace' | 'metadata' | 'chunkSize' | 'toContent'>> &
+    Pick<SQLiteSourceOptions, 'query' | 'preLoadCSV'>;
+
+  constructor(
+    private dbPath: string,
+    options: SQLiteSourceOptions
+  ) {
+    if (!options.toContent) {
+      throw new IngestionError(
+        'SQLiteSource requires a toContent callback. Example: toContent: (row) => `Name: ${row.name}`',
+        this.dbPath
+      );
+    }
+    this.options = {
+      namespace: options.namespace ?? 'sqlite',
+      metadata: options.metadata ?? {},
+      chunkSize: options.chunkSize ?? 100,
+      toContent: options.toContent,
+      query: options.query,
+      preLoadCSV: options.preLoadCSV,
+    };
+  }
+
+  async *load(): AsyncIterable<Chunk> {
+    let Database: new (path: string) => { exec: (sql: string) => void; prepare: (sql: string) => { all: () => unknown[] } };
+    
+    try {
+      // Dynamic import to avoid hard dependency
+      const sqlite3 = await import('better-sqlite3');
+      Database = sqlite3.default;
+    } catch {
+      throw new IngestionError(
+        'SQLite source requires "better-sqlite3" package. Install with: npm install better-sqlite3',
+        this.dbPath
+      );
+    }
+
+    // Check if database file exists
+    try {
+      await fs.access(this.dbPath);
+    } catch {
+      throw new IngestionError('SQLite database file not found', this.dbPath);
+    }
+
+    const db = new Database(this.dbPath);
+
+    try {
+      // Pre-load CSV if specified
+      if (this.options.preLoadCSV) {
+        await this.loadCSV(db, this.options.preLoadCSV);
+      }
+
+      // Execute query and yield results
+      const query = this.options.query ?? 'SELECT * FROM sqlite_master WHERE type = "table"';
+      const stmt = db.prepare(query);
+      const rows = stmt.all();
+
+      // Transform each row using toContent and chunk
+      const contentItems = rows.map((row) => this.options.toContent(row as Record<string, unknown>));
+      
+      for (let i = 0; i < contentItems.length; i += this.options.chunkSize) {
+        const chunkItems = contentItems.slice(i, i + this.options.chunkSize);
+        const chunkContent = chunkItems.join('\n\n---\n\n');
+        
+        yield {
+          id: `sqlite:${this.options.namespace}:${i}`,
+          content: chunkContent,
+          metadata: {
+            ...this.options.metadata,
+            source: path.basename(this.dbPath),
+            type: 'sqlite_query_result',
+            query,
+            startIndex: i,
+            endIndex: Math.min(i + this.options.chunkSize, contentItems.length),
+            totalRows: contentItems.length,
+          },
+        };
+      }
+    } finally {
+      db.exec('VACUUM;');
+      // Note: better-sqlite3 closes automatically when garbage collected
+    }
+  }
+
+  private async loadCSV(
+    db: { exec: (sql: string) => void },
+    config: NonNullable<SQLiteSourceOptions['preLoadCSV']>
+  ): Promise<void> {
+    const fs = await import('fs');
+    const csvContent = await fs.promises.readFile(config.csvPath, 'utf-8');
+    
+    const delimiter = config.delimiter ?? ',';
+    const lines = csvContent.split('\n').filter(line => line.trim());
+    
+    if (lines.length === 0) {
+      return;
+    }
+
+    let headers: string[];
+    let dataStartIndex: number;
+
+    if (config.headers !== false) {
+      headers = lines[0].split(delimiter).map(h => h.trim().replace(/^["']|["']$/g, ''));
+      dataStartIndex = 1;
+    } else {
+      // Generate column names if no headers
+      const firstRow = lines[0].split(delimiter);
+      headers = firstRow.map((_, i) => `col${i}`);
+      dataStartIndex = 0;
+    }
+
+    // Create table with sanitized table name (alphanumeric and underscore only)
+    const sanitizedTableName = config.tableName.replace(/[^a-zA-Z0-9_]/g, '_');
+    const columns = headers.map(h => `"${h.replace(/"/g, '""')}" TEXT`).join(', ');
+    db.exec(`DROP TABLE IF EXISTS "${sanitizedTableName}";`);
+    db.exec(`CREATE TABLE "${sanitizedTableName}" (${columns});`);
+
+    // Insert data using prepared statement (type assertion needed for better-sqlite3 API)
+    const placeholders = headers.map(() => '?').join(', ');
+    // eslint-disable-next-line @typescript-eslint/no-explicit-any
+    const insertStmt = (db as any).prepare(`INSERT INTO "${sanitizedTableName}" VALUES (${placeholders})`);
+    for (let i = dataStartIndex; i < lines.length; i++) {
+      const values = lines[i].split(delimiter).map(v => v.trim().replace(/^["']|["']$/g, ''));
+      insertStmt.run(values);
+    }
+  }
+}
diff --git a/packages/toolpack-sdk/README.md b/packages/toolpack-sdk/README.md
index bd5ed98..2f08f97 100644
--- a/packages/toolpack-sdk/README.md
+++ b/packages/toolpack-sdk/README.md
@@ -1,6 +1,6 @@
 # Toolpack SDK
 
-A unified TypeScript/Node.js SDK for building AI-powered applications with multiple providers, 90 built-in tools, a workflow engine, and a flexible mode system — all through a single API.
+A unified TypeScript/Node.js SDK for building AI-powered applications with multiple providers, 97 built-in tools, a workflow engine, and a flexible mode system — all through a single API.
 
 [![npm version](https://img.shields.io/npm/v/toolpack-sdk.svg)](https://www.npmjs.com/package/toolpack-sdk)
 [![License: Apache 2.0](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)
@@ -18,7 +18,7 @@ A unified TypeScript/Node.js SDK for building AI-powered applications with multi
 - **Mode System** — Built-in Agent and Chat modes, plus `createMode()` for custom modes with tool filtering
 - **HITL Confirmation** — Human-in-the-loop approval for high-risk operations with configurable bypass rules
 - **Custom Providers** — Bring your own provider by implementing the `ProviderAdapter` interface
-- **90 Built-in Tools** across 11 categories:
+- **97 Built-in Tools** across 12 categories:
 - **MCP Tool Server Integration** — dynamically bridge external Model Context Protocol servers into Toolpack as first-class tools via `createMcpToolProject()` and `disconnectMcpToolProject()`.
 
 | Category | Tools | Description |
@@ -31,6 +31,7 @@ A unified TypeScript/Node.js SDK for building AI-powered applications with multi
 | **`http-tools`** | 5 | HTTP requests — GET, POST, PUT, DELETE, download |
 | **`web-tools`** | 9 | Web interaction — fetch, search (Tavily/Brave/DuckDuckGo), scrape, extract links, map, metadata, sitemap, feed, screenshot |
 | **`system-tools`** | 5 | System info — env vars, cwd, disk usage, system info, set env |
+| **`github-tools`** | 9 | GitHub operations — PR reviews, review threads, file diffs, issue comments, GraphQL, repo contents |
 | **`diff-tools`** | 3 | Patch operations — create, apply, and preview diffs |
 | **`cloud-tools`** | 3 | Deployments — deploy, status, list (via Netlify) |
 | **`k8s-tools`** | 11 | Kubernetes cluster inspection and management via kubectl |
@@ -60,7 +61,7 @@ const sdk = await Toolpack.init({
     anthropic: {},   // Reads ANTHROPIC_API_KEY from env
   },
   defaultProvider: 'openai',
-  tools: true,         // Load all 90 built-in tools
+  tools: true,         // Load all 97 built-in tools
   defaultMode: 'agent', // Agent mode with workflow engine
 });
 
@@ -548,7 +549,7 @@ client.on('tool:failed', (event) => { /* ... */ });
 
 ## Custom Tools
 
-In addition to the 90 built-in tools, you can create and register your own custom tool projects using `createToolProject()`:
+In addition to the 97 built-in tools, you can create and register your own custom tool projects using `createToolProject()`:
 
 ```typescript
 import { Toolpack, createToolProject } from 'toolpack-sdk';
@@ -646,6 +647,355 @@ const response = await toolpack.chat('How do I configure authentication?');
 
 See the [Knowledge package README](../toolpack-knowledge/README.md) for full documentation.
 
+## AI Agents (@toolpack-sdk/agents)
+
+Build production-ready AI agents with channels, workflows, and event-driven architecture using the companion `@toolpack-sdk/agents` package:
+
+```bash
+npm install @toolpack-sdk/agents
+```
+
+### What are Agents?
+
+Agents are autonomous AI systems that:
+- **Listen** for events from channels (Slack, webhooks, schedules, etc.)
+- **Process** messages using the Toolpack SDK
+- **Execute** tasks with full tool access
+- **Respond** back through the same or different channels
+- **Remember** conversations using knowledge bases
+
+### Quick Start
+
+```typescript
+import { Toolpack } from 'toolpack-sdk';
+import { BaseAgent, AgentRegistry, SlackChannel } from '@toolpack-sdk/agents';
+
+// 1. Create a custom agent
+class SupportAgent extends BaseAgent {
+  name = 'support-agent';
+  description = 'Customer support agent that answers questions';
+  mode = 'chat';
+
+  async invokeAgent(input) {
+    const result = await this.run(input.message);
+    await this.sendTo('slack-support', result.output);
+    return result;
+  }
+}
+
+// 2. Set up channels
+const slackChannel = new SlackChannel({
+  name: 'slack-support',
+  token: process.env.SLACK_BOT_TOKEN,
+  signingSecret: process.env.SLACK_SIGNING_SECRET,
+});
+
+// 3. Register agent and channels
+const registry = new AgentRegistry([
+  { agent: SupportAgent, channels: [slackChannel] },
+]);
+
+// 4. Initialize Toolpack with agents
+const sdk = await Toolpack.init({
+  provider: 'openai',
+  tools: true,
+  agents: registry,
+});
+
+// Agents now listen and respond automatically!
+```
+
+### Built-in Agents
+
+The package includes 4 production-ready agents you can use directly or extend:
+
+#### ResearchAgent
+```typescript
+import { ResearchAgent } from '@toolpack-sdk/agents';
+
+const agent = new ResearchAgent(sdk);
+const result = await agent.invokeAgent({
+  message: 'Summarize recent developments in edge AI',
+});
+```
+- **Mode:** `agent`
+- **Tools:** web.search, web.fetch, web.scrape
+- **Use Cases:** Market research, competitive analysis, trend monitoring
+
+#### CodingAgent
+```typescript
+import { CodingAgent } from '@toolpack-sdk/agents';
+
+const agent = new CodingAgent(sdk);
+const result = await agent.invokeAgent({
+  message: 'Refactor the auth module to use the new SDK pattern',
+});
+```
+- **Mode:** `coding`
+- **Tools:** fs.*, coding.*, git.*, exec.*
+- **Use Cases:** Code generation, refactoring, debugging, test writing
+
+#### DataAgent
+```typescript
+import { DataAgent } from '@toolpack-sdk/agents';
+
+const agent = new DataAgent(sdk);
+const result = await agent.invokeAgent({
+  message: 'Generate a weekly summary of signups by region',
+});
+```
+- **Mode:** `agent`
+- **Tools:** db.*, fs.*, http.*
+- **Use Cases:** Database queries, reporting, data analysis, CSV generation
+
+#### BrowserAgent
+```typescript
+import { BrowserAgent } from '@toolpack-sdk/agents';
+
+const agent = new BrowserAgent(sdk);
+const result = await agent.invokeAgent({
+  message: 'Extract all product prices from acme.com/products',
+});
+```
+- **Mode:** `chat`
+- **Tools:** web.fetch, web.screenshot, web.extract_links
+- **Use Cases:** Web scraping, form filling, content extraction
+
+### Channels
+
+Channels connect agents to the outside world. The package includes 7 built-in channels:
+
+#### SlackChannel (Two-way)
+```typescript
+import { SlackChannel } from '@toolpack-sdk/agents';
+
+const slack = new SlackChannel({
+  name: 'slack-support',
+  token: process.env.SLACK_BOT_TOKEN,
+  signingSecret: process.env.SLACK_SIGNING_SECRET,
+});
+```
+- ✅ Receives messages from Slack
+- ✅ Replies in threads
+- ✅ Supports `ask()` for human input
+
+#### TelegramChannel (Two-way)
+```typescript
+import { TelegramChannel } from '@toolpack-sdk/agents';
+
+const telegram = new TelegramChannel({
+  name: 'telegram-bot',
+  token: process.env.TELEGRAM_BOT_TOKEN,
+});
+```
+- ✅ Receives messages from Telegram
+- ✅ Replies to users
+- ✅ Supports `ask()` for human input
+
+#### WebhookChannel (Two-way)
+```typescript
+import { WebhookChannel } from '@toolpack-sdk/agents';
+
+const webhook = new WebhookChannel({
+  name: 'github-webhook',
+  path: '/webhook/github',
+  port: 3000,
+  secret: process.env.WEBHOOK_SECRET,
+});
+```
+- ✅ Receives HTTP POST webhooks
+- ✅ Signature verification
+- ✅ Supports `ask()` for human input
+
+#### ScheduledChannel (Trigger-only)
+```typescript
+import { ScheduledChannel } from '@toolpack-sdk/agents';
+
+const scheduler = new ScheduledChannel({
+  name: 'daily-report',
+  cron: '0 9 * * 1-5', // 9am weekdays
+  notify: 'webhook:https://hooks.example.com/daily-report',
+  message: 'Generate the daily sales report',
+});
+// For Slack delivery, attach a named SlackChannel to the same agent and
+// call `this.sendTo('<slackChannelName>', output)` from within `run()`.
+```
+- ⏰ Triggers agents on cron schedules
+- ✅ Full cron expression support (ranges, steps, lists, combinations)
+- ❌ No `ask()` support (no human recipient)
+
+#### DiscordChannel (Two-way)
+```typescript
+import { DiscordChannel } from '@toolpack-sdk/agents';
+
+const discord = new DiscordChannel({
+  name: 'discord-bot',
+  token: process.env.DISCORD_BOT_TOKEN,
+  guildId: 'your-guild-id',
+  channelId: 'your-channel-id',
+});
+```
+- ✅ Receives messages from Discord
+- ✅ Replies in threads
+- ✅ Supports `ask()` for human input
+
+#### EmailChannel (Outbound-only)
+```typescript
+import { EmailChannel } from '@toolpack-sdk/agents';
+
+const email = new EmailChannel({
+  name: 'email-alerts',
+  from: 'bot@acme.com',
+  to: 'team@acme.com',
+  smtp: {
+    host: 'smtp.gmail.com',
+    port: 587,
+    auth: { user: 'bot@acme.com', pass: process.env.SMTP_PASSWORD },
+  },
+});
+```
+- 📧 Sends emails via SMTP
+- ❌ No `ask()` support (outbound-only)
+
+#### SMSChannel (Configurable)
+```typescript
+import { SMSChannel } from '@toolpack-sdk/agents';
+
+// Two-way with webhook
+const sms = new SMSChannel({
+  name: 'sms-alerts',
+  accountSid: process.env.TWILIO_ACCOUNT_SID,
+  authToken: process.env.TWILIO_AUTH_TOKEN,
+  from: '+1234567890',
+  webhookPath: '/sms/webhook', // Enables two-way
+  port: 3000,
+});
+
+// Outbound-only
+const smsOutbound = new SMSChannel({
+  name: 'sms-notifications',
+  accountSid: process.env.TWILIO_ACCOUNT_SID,
+  authToken: process.env.TWILIO_AUTH_TOKEN,
+  from: '+1234567890',
+  to: '+0987654321', // Fixed recipient
+});
+```
+- 📱 Twilio SMS integration
+- ✅ Two-way when `webhookPath` is set
+- ❌ Outbound-only without webhook
+
+### Agent Lifecycle & Events
+
+Agents emit events at each stage of execution:
+
+```typescript
+const agent = new MyAgent(sdk);
+
+agent.on('agent:start', (input) => {
+  console.log('Agent started:', input.message);
+});
+
+agent.on('agent:complete', (result) => {
+  console.log('Agent completed:', result.output);
+});
+
+agent.on('agent:error', (error) => {
+  console.error('Agent error:', error);
+});
+```
+
+### Knowledge Integration
+
+Agents can use knowledge bases for conversation memory and RAG:
+
+```typescript
+import { Knowledge, MemoryProvider, OllamaEmbedder } from '@toolpack-sdk/knowledge';
+import { BaseAgent } from '@toolpack-sdk/agents';
+
+class SmartAgent extends BaseAgent {
+  name = 'smart-agent';
+  description = 'Agent with memory';
+  mode = 'chat';
+  
+  constructor(toolpack) {
+    super(toolpack);
+    // Set up knowledge base
+    this.knowledge = await Knowledge.create({
+      provider: new MemoryProvider(),
+      embedder: new OllamaEmbedder({ model: 'nomic-embed-text' }),
+    });
+  }
+
+  async invokeAgent(input) {
+    // Conversation history is automatically loaded from knowledge
+    const result = await this.run(input.message);
+    return result;
+  }
+}
+```
+
+### Multi-Channel Routing
+
+Agents can send output to different channels:
+
+```typescript
+class MultiChannelAgent extends BaseAgent {
+  name = 'multi-agent';
+  description = 'Routes to multiple channels';
+  mode = 'agent';
+
+  async invokeAgent(input) {
+    const result = await this.run(input.message);
+    
+    // Send to multiple channels
+    await this.sendTo('slack:#general', result.output);
+    await this.sendTo('email-team', result.output);
+    await this.sendTo('sms-alerts', 'Task completed!');
+    
+    return result;
+  }
+}
+```
+
+### Extending Built-in Agents
+
+```typescript
+import { ResearchAgent } from '@toolpack-sdk/agents';
+
+class FintechResearchAgent extends ResearchAgent {
+  systemPrompt = `You are a research agent focused on fintech.
+                  Always cite sources and flag regulatory implications.`;
+  provider = 'anthropic';
+  model = 'claude-sonnet-4-20250514';
+
+  async onComplete(result) {
+    // Store research in knowledge base
+    if (this.knowledge) {
+      await this.knowledge.add(result.output, { 
+        category: 'research',
+        topic: 'fintech',
+      });
+    }
+    
+    // Send to Slack
+    await this.sendTo('slack-research', result.output);
+  }
+}
+```
+
+### Features
+
+- ✅ **7 Built-in Channels** — Slack, Telegram, Discord, Email, SMS, Webhook, Scheduled
+- ✅ **4 Built-in Agents** — Research, Coding, Data, Browser
+- ✅ **Event-Driven** — Full lifecycle events for monitoring
+- ✅ **Knowledge Integration** — Conversation memory and RAG
+- ✅ **Multi-Channel Routing** — Send to any registered channel
+- ✅ **Human-in-the-Loop** — `ask()` support for two-way channels
+- ✅ **Type-Safe** — Full TypeScript support
+- ✅ **199 Tests Passing** — Production-ready
+
+See the [Agents package README](../toolpack-agents/README.md) for full documentation.
+
 ## Multimodal Support
 
 The SDK supports multimodal inputs (text + images) across all vision-capable providers. Images can be provided in three formats:
@@ -926,6 +1276,7 @@ interface CompletionRequest {
   temperature?: number;
   max_tokens?: number;
   tools?: ToolCallRequest[];
+  requestTools?: RequestToolDefinition[];  // Request-scoped tools
   tool_choice?: 'auto' | 'none' | 'required';
 }
 
@@ -956,6 +1307,115 @@ interface ProviderModelInfo {
 }
 ```
 
+### Request-Scoped Tools
+
+Request-scoped tools are dynamic tools attached to a single completion request. Unlike globally registered tools in the ToolRegistry, they:
+
+- **Don't pollute the shared registry** — Each request can have its own tools
+- **Can close over request-specific state** — e.g., `conversationId`, user context
+- **Are safe for multi-agent/multi-request usage** — No cross-request contamination
+- **Execute through the same SDK orchestration** — Events, logging, HITL all work
+
+#### Built-in Request-Scoped Tools
+
+**Knowledge Tools** (when `knowledge` is configured):
+- `knowledge_search` — Search the knowledge base for relevant information
+- `knowledge_add` — Add new content to the knowledge base at runtime
+
+**Conversation Tools** (when using `ConversationHistory`):
+- `conversation_search` — Search conversation history for past messages
+
+#### Creating Custom Request Tools
+
+```typescript
+import { RequestToolDefinition, ConversationHistory } from 'toolpack-sdk';
+
+// Example: Session-specific calculator
+const createCalculatorTool = (sessionId: string): RequestToolDefinition => ({
+  name: 'calculate',
+  displayName: 'Calculator',
+  description: 'Perform mathematical calculations',
+  category: 'math',
+  parameters: {
+    type: 'object',
+    properties: {
+      expression: { type: 'string', description: 'Math expression to evaluate' },
+    },
+    required: ['expression'],
+  },
+  execute: async (args) => {
+    // Can safely close over sessionId
+    console.log(`Session ${sessionId}: calculating ${args.expression}`);
+    
+    // Simple eval (use a proper math library in production)
+    const result = eval(args.expression);
+    return { result, sessionId };
+  },
+});
+
+// Use in a request
+const result = await sdk.generate({
+  messages: [{ role: 'user', content: 'What is 15 * 23?' }],
+  model: 'gpt-4',
+  requestTools: [createCalculatorTool('user-123')],
+});
+```
+
+#### Using ConversationHistory with Request Tools
+
+```typescript
+import { ConversationHistory } from 'toolpack-sdk';
+
+const history = new ConversationHistory('./chat.db');
+
+// Add some messages
+await history.addUserMessage('conv-1', 'What is the API rate limit?');
+await history.addAssistantMessage('conv-1', 'The rate limit is 100 requests per minute.');
+
+// Use conversation search in a request
+const result = await sdk.generate({
+  messages: [
+    { role: 'user', content: 'What did we discuss about rate limits?' }
+  ],
+  model: 'gpt-4',
+  requestTools: [
+    history.toTool('conv-1'),  // Scoped to conversation 'conv-1'
+  ],
+});
+
+// AI can now call conversation_search to find the earlier discussion
+```
+
+#### Request Tools vs Registry Tools
+
+| Feature | Request Tools | Registry Tools |
+|---------|---------------|----------------|
+| **Scope** | Single request | All requests |
+| **State** | Can close over request state | Stateless |
+| **Registration** | Per-request via `requestTools` | Global via `ToolRegistry` |
+| **Use Case** | Dynamic, stateful tools | Reusable, static tools |
+| **Priority** | Higher (checked first) | Lower |
+| **Examples** | `conversation_search`, `knowledge_add` | `fs.read_file`, `web.search` |
+
+#### Automatic Guidance Injection
+
+When request-scoped tools are present, the SDK automatically injects usage guidance into the system prompt:
+
+```
+Knowledge Base:
+- Use `knowledge_search` when you need factual or domain-specific information.
+- Use `knowledge_add` when you learn durable information that should be saved.
+
+Conversation History:
+- Only recent messages may be present in context.
+- Use `conversation_search` to find details from earlier in this conversation.
+```
+
+This guidance is:
+- **Per-request** — Only injected when tools are actually present
+- **Derived from effective tool set** — Reflects the actual tools available
+- **Idempotent** — Won't duplicate if already present
+
 ## Error Handling
 
 The SDK provides typed error classes for common failure scenarios:
@@ -1011,7 +1471,7 @@ toolpack-sdk/
 │   │   └── ollama/        # Ollama adapter + provider (auto-discovery)
 │   ├── modes/             # Mode system (Agent, Chat, createMode)
 │   ├── workflows/         # Workflow engine (planner, step executor, progress)
-│   ├── tools/             # 90 built-in tools + registry + router + BM25 search
+│   ├── tools/             # 97 built-in tools + registry + router + BM25 search
 │   │   ├── fs-tools/      # File system (18 tools)
 │   │   ├── coding-tools/  # Code analysis (12 tools)
 │   │   ├── git-tools/     # Git operations (9 tools)
diff --git a/packages/toolpack-sdk/package.json b/packages/toolpack-sdk/package.json
index d2cece0..431c965 100644
--- a/packages/toolpack-sdk/package.json
+++ b/packages/toolpack-sdk/package.json
@@ -1,7 +1,7 @@
 {
   "name": "toolpack-sdk",
   "version": "1.4.0",
-  "description": "Unified TypeScript SDK for AI providers (OpenAI, Anthropic, Gemini, Ollama) with 90 built-in tools, workflow engine, and mode system for building AI-powered applications",
+  "description": "Unified TypeScript SDK for AI providers (OpenAI, Anthropic, Gemini, Ollama) with 97 built-in tools, workflow engine, and mode system for building AI-powered applications",
   "engines": {
     "node": ">=20"
   },
diff --git a/packages/toolpack-sdk/src/client/index.ts b/packages/toolpack-sdk/src/client/index.ts
index 9d1c69b..b752afb 100644
--- a/packages/toolpack-sdk/src/client/index.ts
+++ b/packages/toolpack-sdk/src/client/index.ts
@@ -1,6 +1,6 @@
 import { EventEmitter } from 'events';
 import { ProviderAdapter } from "../providers/base/index.js";
-import { CompletionRequest, CompletionResponse, CompletionChunk, ToolCallRequest, ToolCallResult, EmbeddingRequest, EmbeddingResponse, ToolProgressEvent, ToolLogEvent, OnToolConfirmCallback, ToolConfirmationRequestedEvent, ToolConfirmationResolvedEvent, ContextWindowConfig, ProviderModelInfo } from "../types/index.js";
+import { CompletionRequest, CompletionResponse, CompletionChunk, ToolCallRequest, ToolCallResult, EmbeddingRequest, EmbeddingResponse, ToolProgressEvent, ToolLogEvent, OnToolConfirmCallback, ToolConfirmationRequestedEvent, ToolConfirmationResolvedEvent, RequestToolDefinition, ContextWindowConfig, ProviderModelInfo } from "../types/index.js";
 import { SDKError, ProviderError } from "../errors/index.js";
 import { ContextWindowExceededError, SummarizationError } from '../errors/context-window-errors.js';
 import { countTokens, getSafeOutputReserve } from '../utils/token-counter.js';
@@ -13,7 +13,7 @@ import type { ToolsConfig, ToolSchema, ToolContext, ToolDefinition } from "../to
 import { DEFAULT_TOOLS_CONFIG } from "../tools/types.js";
 import type { HitlConfig } from '../providers/config.js';
 import { ModeConfig } from '../modes/mode-types.js';
-import { BM25SearchEngine, isToolSearchTool, generateToolCategoriesPrompt } from '../tools/search/index.js';
+import { BM25SearchEngine, isToolSearchTool, getToolSearchSchema, generateToolCategoriesPrompt } from '../tools/search/index.js';
 import { generateBaseAgentContext } from './base-agent-context.js';
 import { QueryClassifier } from './query-classifier.js';
 import { ToolOrchestrator } from './tool-orchestrator.js';
@@ -36,6 +36,11 @@ function logRequestMessages(requestId: string, messages: CompletionRequest['mess
     });
 }
 
+interface EnrichedRequestResult {
+    request: CompletionRequest;
+    requestToolMap: Map<string, RequestToolDefinition>;
+}
+
 function inferNeedsTools(messages: CompletionRequest['messages']): boolean {
     const text = extractLastUserText(messages).toLowerCase();
     if (!text) return false;
@@ -614,7 +619,9 @@ export class AIClient extends EventEmitter {
 
             // Resolve tools to send with the request
             const resolvedProviderName = providerName || this.defaultProvider;
-            let enrichedRequest = await this.enrichRequestWithTools(modeAwareRequest);
+            const initialEnrichment = await this.enrichRequestWithTools(modeAwareRequest);
+            let enrichedRequest = initialEnrichment.request;
+            const requestToolMap = initialEnrichment.requestToolMap;
             enrichedRequest = await this.enforceContextWindow(enrichedRequest, provider);
 
             const policy = (process.env.TOOLPACK_SDK_TOOL_CHOICE_POLICY || this.toolsConfig.toolChoicePolicy || 'auto') as any;
@@ -652,7 +659,7 @@ export class AIClient extends EventEmitter {
             }
 
             const providerClass = (provider as any)?.constructor?.name || 'UnknownProvider';
-            const outboundReq: any = { ...enrichedRequest, __toolpack_request_id: requestId };
+            const outboundReq: any = { ...this.stripRequestTools(enrichedRequest), __toolpack_request_id: requestId };
 
             logInfo(`[AIClient][${requestId}] generate() start provider=${resolvedProviderName} class=${providerClass} model=${enrichedRequest.model} messages=${enrichedRequest.messages.length} tools=${enrichedRequest.tools?.length || 0} tool_choice=${(enrichedRequest as any).tool_choice ?? 'unset'} policy=${policy} needsTools=${needsTools} autoExecute=${this.toolsConfig.enabled && this.toolsConfig.autoExecute}`);
             logRequestMessages(requestId, enrichedRequest.messages);
@@ -662,7 +669,7 @@ export class AIClient extends EventEmitter {
             logDebug(`[AIClient][${requestId}] generate() initial response finish_reason=${(response as any).finish_reason ?? 'unknown'} tool_calls=${response.tool_calls?.length || 0} content_preview=${safePreview(response.content || '', 200)}`);
 
             // Auto-execute tool call loop
-            if (this.toolsConfig.enabled && this.toolsConfig.autoExecute && this.toolRegistry) {
+            if (this.toolsConfig.autoExecute && (this.toolRegistry || requestToolMap.size > 0)) {
                 // Classify query to adjust maxToolRounds
                 const userMessage = extractLastUserText(enrichedRequest.messages);
                 const classification = this.queryClassifier.classify(userMessage);
@@ -733,7 +740,7 @@ export class AIClient extends EventEmitter {
                         logInfo(`[AIClient][${requestId}] Using parallel execution for ${toolCallsToExecute.length} tools`);
                         const toolResults = await this.toolOrchestrator.executeWithDependencies(
                             toolCallsToExecute,
-                            (toolCall) => this.executeTool(toolCall),
+                            (toolCall) => this.executeTool(toolCall, requestToolMap),
                             5 // maxConcurrent
                         );
 
@@ -792,7 +799,7 @@ export class AIClient extends EventEmitter {
                                 continue;
                             }
 
-                            const result = await this.executeTool(toolCall);
+                            const result = await this.executeTool(toolCall, requestToolMap);
                             const resultStr = typeof result === 'string' ? result : JSON.stringify(result);
 
                             // Check budget before adding
@@ -826,7 +833,7 @@ export class AIClient extends EventEmitter {
                     // Call the model again with updated messages
                     const rawFollowupReq: any = { ...enrichedRequest, messages, __toolpack_request_id: requestId };
                     // Re-enrich to include any tools discovered in the previous round
-                    let followupReq = await this.enrichRequestWithTools(rawFollowupReq);
+                    let followupReq = this.stripRequestTools((await this.enrichRequestWithTools(rawFollowupReq)).request);
                     followupReq = await this.enforceContextWindow(followupReq, provider);
 
                     if ((followupReq as any).tool_choice === 'required') {
@@ -864,7 +871,9 @@ export class AIClient extends EventEmitter {
             modeAwareRequest = this.injectOverrideSystemPrompt(modeAwareRequest);
             modeAwareRequest = this.injectModeSystemPrompt(modeAwareRequest);
 
-            let enrichedRequest = await this.enrichRequestWithTools(modeAwareRequest);
+            const initialEnrichment = await this.enrichRequestWithTools(modeAwareRequest);
+            let enrichedRequest = initialEnrichment.request;
+            const requestToolMap = initialEnrichment.requestToolMap;
             enrichedRequest = await this.enforceContextWindow(enrichedRequest, provider);
 
             const policy = (process.env.TOOLPACK_SDK_TOOL_CHOICE_POLICY || this.toolsConfig.toolChoicePolicy || 'auto') as any;
@@ -902,12 +911,12 @@ export class AIClient extends EventEmitter {
             }
 
             const providerClass = (provider as any)?.constructor?.name || 'UnknownProvider';
-            const baseReq: any = { ...enrichedRequest, __toolpack_request_id: requestId };
+            const baseReq: any = { ...this.stripRequestTools(enrichedRequest), __toolpack_request_id: requestId };
 
             logInfo(`[AIClient][${requestId}] stream() start provider=${resolvedProviderName} class=${providerClass} model=${enrichedRequest.model} messages=${enrichedRequest.messages.length} tools=${enrichedRequest.tools?.length || 0} tool_choice=${(enrichedRequest as any).tool_choice ?? 'unset'} policy=${policy} needsTools=${needsTools} autoExecute=${this.toolsConfig.enabled && this.toolsConfig.autoExecute}`);
             logRequestMessages(requestId, enrichedRequest.messages);
 
-            if (!this.toolsConfig.enabled || !this.toolsConfig.autoExecute || !this.toolRegistry) {
+            if (!this.toolsConfig.autoExecute || (!this.toolRegistry && requestToolMap.size === 0)) {
                 yield* provider.stream(baseReq);
                 return;
             }
@@ -940,9 +949,9 @@ export class AIClient extends EventEmitter {
                 logInfo(`[AIClient][${requestId}] stream() round_start ${rounds}/${maxRounds}`);
                 let lastFinishReason: string | null = null;
 
-                const rawRoundReq: any = { ...baseReq, messages };
+                const rawRoundReq: any = { ...enrichedRequest, messages };
                 // Re-enrich to include any newly discovered tools from previous rounds
-                let roundReq = await this.enrichRequestWithTools(rawRoundReq);
+                let roundReq = this.stripRequestTools((await this.enrichRequestWithTools(rawRoundReq)).request);
                 roundReq = await this.enforceContextWindow(roundReq, provider);
 
                 if (rounds > 0 && (roundReq as any).tool_choice === 'required') {
@@ -1053,7 +1062,7 @@ export class AIClient extends EventEmitter {
                         if (!toolDone) heartbeatChunks.push({ delta: '' });
                     }, 500);
 
-                    const result = await this.executeTool(toolCall);
+                    const result = await this.executeTool(toolCall, requestToolMap);
                     toolDone = true;
                     clearInterval(heartbeatInterval);
                     const duration = Date.now() - startTime;
@@ -1132,16 +1141,20 @@ export class AIClient extends EventEmitter {
      * Enrich a request with tools based on the router config.
      * Applies mode-based tool filtering when an active mode is set.
      */
-    private async enrichRequestWithTools(request: CompletionRequest): Promise<CompletionRequest> {
+    private async enrichRequestWithTools(request: CompletionRequest): Promise<EnrichedRequestResult> {
         // If mode blocks ALL tools, return request with no tools
         if (this.activeMode?.blockAllTools) {
             logInfo(`[AIClient] Mode "${this.activeMode.displayName}" blocks all tools`);
-            return request;
+            return { request, requestToolMap: new Map() };
         }
 
-        if (!this.toolsConfig.enabled || (!this.toolRegistry && (request.tools?.length || 0) === 0)) {
-            logDebug(`[AIClient] Tools disabled or no registry`);
-            return request;
+        const requestToolMap = this.buildRequestToolMap(request.requestTools);
+        const requestToolSchemas = Array.from(requestToolMap.values()).map(tool => this.requestToolToSchema(tool));
+        const hasRequestTools = requestToolMap.size > 0;
+
+        if (!this.toolsConfig.enabled && !hasRequestTools) {
+            logDebug(`[AIClient] Tools disabled and no request-scoped tools`);
+            return { request, requestToolMap };
         }
 
         // Merge mode-specific tool search config with global config
@@ -1163,7 +1176,12 @@ export class AIClient extends EventEmitter {
         if (request.tools && request.tools.length > 0) {
             if (!resolvedToolsConfig.toolSearch?.enabled || !this.toolRegistry) {
                 logDebug(`[AIClient] Request already has ${request.tools.length} tools`);
-                return request;
+                const tools = this.mergeToolCallRequests(request.tools, this.schemasToToolCallRequests(requestToolSchemas));
+                const nextRequest = tools === request.tools ? request : { ...request, tools };
+                return {
+                    request: this.injectRequestToolGuidance(nextRequest, tools),
+                    requestToolMap,
+                };
             }
 
             let schemas = await this.toolRouter.resolve(
@@ -1197,24 +1215,40 @@ export class AIClient extends EventEmitter {
 
             if (newTools.length === 0) {
                 logDebug(`[AIClient] Request already has ${request.tools.length} tools (no new discoveries)`);
-                return request;
+                const tools = this.mergeToolCallRequests(request.tools, this.schemasToToolCallRequests(requestToolSchemas));
+                const nextRequest = tools === request.tools ? request : { ...request, tools };
+                return {
+                    request: this.injectRequestToolGuidance(nextRequest, tools),
+                    requestToolMap,
+                };
             }
 
             let enrichedRequest: CompletionRequest = {
                 ...request,
-                tools: [...request.tools, ...newTools],
+                tools: this.mergeToolCallRequests(
+                    [...request.tools, ...newTools],
+                    this.schemasToToolCallRequests(requestToolSchemas)
+                ),
             };
 
             if (resolvedToolsConfig.toolSearch?.enabled && this.toolRegistry) {
                 enrichedRequest = this.injectToolSearchPrompt(enrichedRequest);
             }
 
-            return enrichedRequest;
+            return {
+                request: this.injectRequestToolGuidance(enrichedRequest, enrichedRequest.tools),
+                requestToolMap,
+            };
         }
 
         if (!this.toolRegistry) {
             logDebug('[AIClient] Tool registry not configured, skipping tool resolution');
-            return request;
+            const tools = this.schemasToToolCallRequests(requestToolSchemas);
+            const nextRequest = tools.length > 0 ? { ...request, tools } : request;
+            return {
+                request: this.injectRequestToolGuidance(nextRequest, tools),
+                requestToolMap,
+            };
         }
 
         const activeRegistry = this.toolRegistry;
@@ -1237,27 +1271,143 @@ export class AIClient extends EventEmitter {
             }
         }
 
-        if (schemas.length === 0) {
-            return request;
+        const tools = this.schemasToToolCallRequests(this.mergeSchemas(schemas, requestToolSchemas));
+
+        if (tools.length === 0) {
+            return { request, requestToolMap };
+        }
+
+        let enrichedRequest: CompletionRequest = { ...request, tools };
+
+        // Inject Tool Search system prompt if enabled
+        if (this.toolsConfig.toolSearch?.enabled && activeRegistry) {
+            enrichedRequest = this.injectToolSearchPrompt(enrichedRequest);
         }
 
-        const tools: ToolCallRequest[] = schemas.map(s => ({
+        return {
+            request: this.injectRequestToolGuidance(enrichedRequest, tools),
+            requestToolMap,
+        };
+    }
+
+    private buildRequestToolMap(requestTools?: RequestToolDefinition[]): Map<string, RequestToolDefinition> {
+        const map = new Map<string, RequestToolDefinition>();
+        for (const tool of requestTools || []) {
+            map.set(tool.name, tool);
+        }
+        return map;
+    }
+
+    private requestToolToSchema(tool: RequestToolDefinition): ToolSchema {
+        return {
+            name: tool.name,
+            displayName: tool.displayName,
+            description: tool.description,
+            parameters: tool.parameters as any,
+            category: tool.category,
+            cacheable: tool.cacheable,
+        };
+    }
+
+    private mergeSchemas(base: ToolSchema[], overrides: ToolSchema[]): ToolSchema[] {
+        const merged = new Map<string, ToolSchema>();
+        for (const schema of base) {
+            merged.set(schema.name, schema);
+        }
+        for (const schema of overrides) {
+            merged.set(schema.name, schema);
+        }
+        return Array.from(merged.values());
+    }
+
+    private schemasToToolCallRequests(schemas: ToolSchema[]): ToolCallRequest[] {
+        return schemas.map(schema => ({
             type: 'function',
             function: {
-                name: s.name,
-                description: s.description,
-                parameters: s.parameters,
+                name: schema.name,
+                description: schema.description,
+                parameters: schema.parameters,
             },
         }));
+    }
 
-        let enrichedRequest: CompletionRequest = { ...request, tools };
+    private mergeToolCallRequests(base: ToolCallRequest[], overrides: ToolCallRequest[]): ToolCallRequest[] {
+        if (overrides.length === 0) {
+            return base;
+        }
+        const merged = new Map<string, ToolCallRequest>();
+        for (const tool of base) {
+            merged.set(tool.function.name, tool);
+        }
+        for (const tool of overrides) {
+            merged.set(tool.function.name, tool);
+        }
+        return Array.from(merged.values());
+    }
 
-        // Inject Tool Search system prompt if enabled
-        if (this.toolsConfig.toolSearch?.enabled && activeRegistry) {
-            enrichedRequest = this.injectToolSearchPrompt(enrichedRequest);
+    private injectRequestToolGuidance(request: CompletionRequest, effectiveTools?: ToolCallRequest[]): CompletionRequest {
+        const toolNames = new Set((effectiveTools || request.tools || []).map(tool => tool.function.name));
+        if (toolNames.size === 0) {
+            return request;
+        }
+
+        // Use a marker to detect if guidance has already been injected
+        const GUIDANCE_MARKER = '<!-- TOOLPACK_REQUEST_TOOL_GUIDANCE -->';
+        
+        const sections: string[] = [];
+
+        if (toolNames.has('knowledge_search') || toolNames.has('knowledge_add')) {
+            const lines = ['Knowledge Base:'];
+            if (toolNames.has('knowledge_search')) {
+                lines.push('- Use `knowledge_search` when you need factual or domain-specific information that may already be stored.');
+            }
+            if (toolNames.has('knowledge_add')) {
+                lines.push('- Use `knowledge_add` when you encounter a durable fact, user preference, or decision that future conversations should know. Do not add confidential information, routine task outputs, or context that is specific to this conversation only.');
+            }
+            sections.push(lines.join('\n'));
+        }
+
+        if (toolNames.has('conversation_search')) {
+            sections.push(
+                'Conversation History:\n- Only recent messages may be present in context.\n- Use `conversation_search` to find relevant details from earlier in this conversation when needed.'
+            );
         }
 
-        return enrichedRequest;
+        if (sections.length === 0) {
+            return request;
+        }
+
+        const guidance = `${GUIDANCE_MARKER}\n${sections.join('\n\n')}`;
+        const systemIndex = request.messages.findIndex(message => message.role === 'system');
+
+        if (systemIndex >= 0) {
+            const messages = request.messages.map((message, index) => {
+                if (index !== systemIndex) return message;
+                const existingContent = typeof message.content === 'string' ? message.content : '';
+                
+                // Check for marker instead of full text for more robust deduplication
+                if (existingContent.includes(GUIDANCE_MARKER)) {
+                    return message; // Already injected
+                }
+                
+                return {
+                    ...message,
+                    content: `${existingContent}\n\n${guidance}`.trim(),
+                };
+            });
+            return { ...request, messages };
+        }
+
+        return {
+            ...request,
+            messages: [{ role: 'system', content: guidance }, ...request.messages],
+        };
+    }
+
+    private stripRequestTools(request: CompletionRequest): CompletionRequest {
+        const { requestTools, ...rest } = request;
+        void requestTools;
+        return rest;
     }
 
     /**
@@ -1270,6 +1420,20 @@ export class AIClient extends EventEmitter {
             if (mode.blockedTools.includes(schema.name)) return false;
             if (mode.blockedToolCategories.includes(schema.category)) return false;
 
+            // Keep tool.search available in tool-search mode even when category allowlists are restrictive.
+            // Explicit blocks above still win.
+            if (isToolSearchTool(schema.name)) {
+                const toolSearchEnabledInMode = mode.toolSearch?.enabled;
+                const toolSearchEnabled =
+                    toolSearchEnabledInMode !== undefined
+                        ? toolSearchEnabledInMode
+                        : (this.toolsConfig.toolSearch?.enabled ?? false);
+
+                if (toolSearchEnabled) {
+                    return true;
+                }
+            }
+
             // If allowlists are specified, tool must match at least one
             const hasAllowedTools = mode.allowedTools.length > 0;
             const hasAllowedCategories = mode.allowedToolCategories.length > 0;
@@ -1479,7 +1643,7 @@ NEVER guess or hallucinate tool names. ALWAYS use tool.search to discover tools
      * Execute a single tool call via the registry.
      * Emits 'tool:started', 'tool:completed', and 'tool:failed' events.
      */
-    private async executeTool(toolCall: ToolCallResult): Promise<string> {
+    private async executeTool(toolCall: ToolCallResult, requestToolMap: Map<string, RequestToolDefinition>): Promise<string> {
         const startTime = Date.now();
 
         // Emit started event
@@ -1492,7 +1656,10 @@ NEVER guess or hallucinate tool names. ALWAYS use tool.search to discover tools
 
         logInfo(`[AIClient] Executing tool: ${toolCall.name} with args: ${safePreview(toolCall.arguments, 500)}`);
 
-        if (!this.toolRegistry) {
+        const requestTool = requestToolMap.get(toolCall.name);
+        const registryTool = requestTool ? undefined : this.toolRegistry?.get(toolCall.name);
+
+        if (!requestTool && !this.toolRegistry) {
             const error = 'No tool registry configured';
             this.emit('tool:failed', {
                 toolName: toolCall.name,
@@ -1529,7 +1696,7 @@ NEVER guess or hallucinate tool names. ALWAYS use tool.search to discover tools
             return result;
         }
 
-        const tool = this.toolRegistry.get(toolCall.name);
+        const tool = requestTool || registryTool;
         if (!tool) {
             logWarn(`[AIClient] Tool '${toolCall.name}' not found in registry`);
 
@@ -1554,27 +1721,27 @@ NEVER guess or hallucinate tool names. ALWAYS use tool.search to discover tools
             let args = toolCall.arguments;
 
             // Human-in-the-loop confirmation check
-            if (tool.confirmation && this.onToolConfirm && !this.isBypassed(tool)) {
+            if (registryTool?.confirmation && this.onToolConfirm && !this.isBypassed(registryTool)) {
                 // Emit confirmation requested event
                 this.emit('tool:confirmation_requested', {
-                    tool,
+                    tool: registryTool,
                     args,
-                    level: tool.confirmation.level,
-                    reason: tool.confirmation.reason,
+                    level: registryTool.confirmation.level,
+                    reason: registryTool.confirmation.reason,
                 } as ToolConfirmationRequestedEvent);
 
                 // Wait for user decision
-                const decision = await this.onToolConfirm(tool, args, {
+                const decision = await this.onToolConfirm(registryTool, args, {
                     roundNumber: this.currentRound,
                     conversationId: this.conversationId,
                 });
 
                 // Emit confirmation resolved event
                 this.emit('tool:confirmation_resolved', {
-                    tool,
+                    tool: registryTool,
                     args,
-                    level: tool.confirmation.level,
-                    reason: tool.confirmation.reason,
+                    level: registryTool.confirmation.level,
+                    reason: registryTool.confirmation.reason,
                     decision,
                 } as ToolConfirmationResolvedEvent);
 
@@ -1612,7 +1779,9 @@ NEVER guess or hallucinate tool names. ALWAYS use tool.search to discover tools
                 config: this.toolsConfig?.additionalConfigurations ?? {},
                 log: (msg) => logInfo(`[Tool] ${msg}`),
             };
-            const result = await tool.execute(args, ctx);
+            const result = requestTool
+                ? await requestTool.execute(args)
+                : await tool.execute(args, ctx);
             const duration = Date.now() - startTime;
 
             // Emit completed event
@@ -1635,11 +1804,12 @@ NEVER guess or hallucinate tool names. ALWAYS use tool.search to discover tools
                 timestamp: Date.now(),
             } as ToolLogEvent);
 
-            logInfo(`[AIClient] Tool ${toolCall.name} executed successfully in ${duration}ms result_len=${result?.length ?? 0}`);
+            const resultLength = typeof result === 'string' ? result.length : JSON.stringify(result).length;
+            logInfo(`[AIClient] Tool ${toolCall.name} executed successfully in ${duration}ms result_len=${resultLength}`);
             if (shouldLog('debug')) {
                 logDebug(`[AIClient] Tool ${toolCall.name} result_preview=${safePreview(result, 400)}`);
             }
-            return result;
+            return typeof result === 'string' ? result : JSON.stringify(result);
         } catch (error: any) {
             const duration = Date.now() - startTime;
             const errorMsg = error.message || 'Tool execution failed';
@@ -1752,10 +1922,44 @@ NEVER guess or hallucinate tool names. ALWAYS use tool.search to discover tools
     private executeToolSearch(args: Record<string, any>): string {
         const { query, category } = args;
         const limit = this.toolsConfig.toolSearch?.searchResultLimit ?? 5;
+        const requestedCategory = typeof category === 'string' && category.length > 0 ? category : undefined;
+
+        if (this.activeMode) {
+            const searchAllowed = this.filterSchemasByMode([getToolSearchSchema()], this.activeMode).length > 0;
+            if (!searchAllowed) {
+                logWarn('[AIClient] tool.search blocked by active mode');
+                return JSON.stringify({
+                    query,
+                    found: 0,
+                    tools: [],
+                    hint: 'tool.search is not allowed in the current mode.',
+                });
+            }
+        }
+
+        logInfo(`[AIClient] Executing tool.search: query="${query}" category=${requestedCategory || 'all'} limit=${limit}`);
+
+        // Oversample so mode filtering (allowed/blocked tools and categories) does not starve the
+        // final result set when allowlists are restrictive. We slice down to the configured limit below.
+        const oversampleLimit = this.activeMode ? Math.max(limit * 4, limit) : limit;
+        let results = this.bm25Engine.search(query, { limit: oversampleLimit, category: requestedCategory });
 
-        logInfo(`[AIClient] Executing tool.search: query="${query}" category=${category || 'all'} limit=${limit}`);
+        if (this.activeMode && results.length > 0) {
+            const allowedSchemas = this.filterSchemasByMode(results.map(result => result.tool), this.activeMode);
+            const allowedToolNames = new Set(allowedSchemas.map(schema => schema.name));
+            const beforeCount = results.length;
 
-        const results = this.bm25Engine.search(query, { limit, category });
+            results = results.filter(result => allowedToolNames.has(result.toolName));
+
+            const filteredCount = beforeCount - results.length;
+            if (filteredCount > 0) {
+                logDebug(`[AIClient] tool.search filtered out ${filteredCount} disallowed results for mode "${this.activeMode.displayName}"`);
+            }
+        }
+
+        if (results.length > limit) {
+            results = results.slice(0, limit);
+        }
 
         // Record discovered tools in the cache
         const toolNames = results.map(r => r.toolName);
diff --git a/packages/toolpack-sdk/src/conversation/conv-types.ts b/packages/toolpack-sdk/src/conversation/conv-types.ts
new file mode 100644
index 0000000..71d8d86
--- /dev/null
+++ b/packages/toolpack-sdk/src/conversation/conv-types.ts
@@ -0,0 +1,128 @@
+import type { Participant } from './participant.js';
+
+/**
+ * Coarse scope of a stored message.
+ *
+ * - `thread`  — a reply inside a specific thread (Slack thread, email thread)
+ * - `channel` — top-level message in a channel / group chat
+ * - `dm`      — direct / private message between two participants
+ */
+export type ConversationScope = 'thread' | 'channel' | 'dm';
+
+/**
+ * A single stored message in conversation history.
+ *
+ * This is the canonical storage shape. It is deliberately richer than
+ * the LLM's role-based format — the prompt assembler projects it into
+ * whatever the provider expects at render time.
+ */
+export interface StoredMessage {
+  /** Stable, unique message id. Used for dedup at capture time. */
+  id: string;
+
+  /**
+   * Conversation key. Identifies the thread / DM / channel this message
+   * belongs to.
+   */
+  conversationId: string;
+
+  /** Who sent this message. */
+  participant: Participant;
+
+  /** Plain-text content of the message. */
+  content: string;
+
+  /** ISO 8601 timestamp of when the message was received/sent. */
+  timestamp: string;
+
+  /** Coarse scope used by the assembler to filter by context type. */
+  scope: ConversationScope;
+
+  metadata?: {
+    /** Platform channel type, e.g. 'im' for Slack DMs, 'private' for Telegram DMs. */
+    channelType?: string;
+    /** Thread timestamp / id within a channel (e.g. Slack thread_ts). */
+    threadId?: string;
+    /** Platform-specific message id for dedup and linking. */
+    messageId?: string;
+    /** Participant ids explicitly @-mentioned in this message. */
+    mentions?: string[];
+    /** Whether this message is a rolling summary replacing older turns. */
+    isSummary?: boolean;
+    /** Human-readable channel or group name (e.g. '#general', 'Project Kore'). */
+    channelName?: string;
+    /** Platform-specific channel identifier (e.g. Slack 'C12345', Telegram chat id). */
+    channelId?: string;
+  };
+}
+
+/** Options for retrieving messages from the store. */
+export interface GetOptions {
+  /** Filter to a specific scope within the conversation. */
+  scope?: ConversationScope;
+
+  /** Only return messages at or after this ISO timestamp. */
+  sinceTimestamp?: string;
+
+  /** Maximum number of messages to return (most recent N). */
+  limit?: number;
+
+  /**
+   * When set, only return messages whose `participant.id` is in this set.
+   * Used by the assembler's addressed-only mode.
+   */
+  participantIds?: string[];
+}
+
+/** Options for the conversation search tool. */
+export interface ConversationSearchOptions {
+  /** Maximum number of results to return. Default: 10. */
+  limit?: number;
+
+  /**
+   * Rough token cap for total search results.
+   * The store truncates content to fit within this budget.
+   * Default: 2000.
+   */
+  tokenCap?: number;
+}
+
+/** Options for the prompt assembler (used by toolpack-agents). */
+export interface AssemblerOptions {
+  scope?: ConversationScope;
+  addressedOnlyMode?: boolean;
+  tokenBudget?: number;
+  rollingSummaryThreshold?: number;
+  timeWindowMinutes?: number;
+  maxTurnsToLoad?: number;
+  agentAliases?: string[];
+}
+
+/** A single message entry in the assembled prompt, ready to send to the LLM. */
+export interface PromptMessage {
+  role: 'system' | 'user' | 'assistant';
+  content: string;
+}
+
+/** The output of the prompt assembler. */
+export interface AssembledPrompt {
+  messages: PromptMessage[];
+  estimatedTokens: number;
+  turnsLoaded: number;
+  hasSummary: boolean;
+}
+
+/**
+ * Interface for conversation history storage.
+ *
+ * Implementations must be:
+ * - **Append-only safe**: `append()` must be idempotent on duplicate `id`.
+ * - **Ordered**: `get()` returns messages in ascending timestamp order.
+ * - **Scope-aware**: `get()` must respect `options.scope` when provided.
+ */
+export interface ConversationStore {
+  append(message: StoredMessage): Promise<void>;
+  get(conversationId: string, options?: GetOptions): Promise<StoredMessage[]>;
+  search(conversationId: string, query: string, options?: ConversationSearchOptions): Promise<StoredMessage[]>;
+  deleteMessages(conversationId: string, ids: string[]): Promise<void>;
+}
diff --git a/packages/toolpack-sdk/src/conversation/conversation.test.ts b/packages/toolpack-sdk/src/conversation/conversation.test.ts
new file mode 100644
index 0000000..c990642
--- /dev/null
+++ b/packages/toolpack-sdk/src/conversation/conversation.test.ts
@@ -0,0 +1,178 @@
+import { describe, it, expect, beforeEach } from 'vitest';
+import { InMemoryConversationStore } from './store.js';
+import type { StoredMessage } from './conv-types.js';
+
+function msg(overrides: Partial<StoredMessage> & { id: string }): StoredMessage {
+  return {
+    conversationId: 'conv-1',
+    participant: { kind: 'user', id: 'u1', displayName: 'Alice' },
+    content: 'hello',
+    timestamp: new Date().toISOString(),
+    scope: 'channel',
+    ...overrides,
+  };
+}
+
+describe('InMemoryConversationStore', () => {
+  let store: InMemoryConversationStore;
+
+  beforeEach(() => {
+    store = new InMemoryConversationStore();
+  });
+
+  describe('append', () => {
+    it('should add a message', async () => {
+      await store.append(msg({ id: '1', content: 'Hello' }));
+      const messages = await store.get('conv-1');
+      expect(messages).toHaveLength(1);
+      expect(messages[0].content).toBe('Hello');
+    });
+
+    it('should be idempotent on duplicate id', async () => {
+      await store.append(msg({ id: '1', content: 'Hello' }));
+      await store.append(msg({ id: '1', content: 'Hello again' }));
+      const messages = await store.get('conv-1');
+      expect(messages).toHaveLength(1);
+    });
+
+    it('should maintain ascending timestamp order', async () => {
+      await store.append(msg({ id: '2', timestamp: '2024-01-01T00:00:02Z', content: 'B' }));
+      await store.append(msg({ id: '1', timestamp: '2024-01-01T00:00:01Z', content: 'A' }));
+      const messages = await store.get('conv-1');
+      expect(messages[0].content).toBe('A');
+      expect(messages[1].content).toBe('B');
+    });
+  });
+
+  describe('get', () => {
+    beforeEach(async () => {
+      await store.append(msg({ id: '1', scope: 'channel', content: 'channel msg' }));
+      await store.append(msg({ id: '2', scope: 'thread', content: 'thread msg' }));
+      await store.append(msg({ id: '3', scope: 'dm', content: 'dm msg' }));
+    });
+
+    it('should return all messages without filter', async () => {
+      const messages = await store.get('conv-1');
+      expect(messages).toHaveLength(3);
+    });
+
+    it('should filter by scope', async () => {
+      const messages = await store.get('conv-1', { scope: 'thread' });
+      expect(messages).toHaveLength(1);
+      expect(messages[0].content).toBe('thread msg');
+    });
+
+    it('should return empty for unknown conversation', async () => {
+      const messages = await store.get('unknown-conv');
+      expect(messages).toHaveLength(0);
+    });
+
+    it('should apply limit to most recent N', async () => {
+      const messages = await store.get('conv-1', { limit: 2 });
+      expect(messages).toHaveLength(2);
+    });
+
+    it('should filter by participantIds', async () => {
+      await store.append(msg({ id: '4', participant: { kind: 'agent', id: 'bot' }, content: 'bot msg' }));
+      const messages = await store.get('conv-1', { participantIds: ['bot'] });
+      expect(messages).toHaveLength(1);
+      expect(messages[0].content).toBe('bot msg');
+    });
+  });
+
+  describe('search', () => {
+    beforeEach(async () => {
+      await store.append(msg({ id: '1', content: 'The quick brown fox' }));
+      await store.append(msg({ id: '2', content: 'jumped over the lazy dog' }));
+      await store.append(msg({ id: '3', content: 'foxes are cunning' }));
+    });
+
+    it('should return matching messages', async () => {
+      const results = await store.search('conv-1', 'fox');
+      expect(results.length).toBeGreaterThanOrEqual(1);
+      expect(results.every(r => r.content.toLowerCase().includes('fox'))).toBe(true);
+    });
+
+    it('should return empty for no match', async () => {
+      const results = await store.search('conv-1', 'zebra');
+      expect(results).toHaveLength(0);
+    });
+
+    it('should respect limit', async () => {
+      const results = await store.search('conv-1', 'fox', { limit: 1 });
+      expect(results).toHaveLength(1);
+    });
+  });
+
+  describe('deleteMessages', () => {
+    it('should remove specified messages', async () => {
+      await store.append(msg({ id: '1', content: 'A' }));
+      await store.append(msg({ id: '2', content: 'B' }));
+      await store.deleteMessages('conv-1', ['1']);
+      const messages = await store.get('conv-1');
+      expect(messages).toHaveLength(1);
+      expect(messages[0].content).toBe('B');
+    });
+
+    it('should be a no-op for unknown ids', async () => {
+      await store.append(msg({ id: '1', content: 'A' }));
+      await store.deleteMessages('conv-1', ['nonexistent']);
+      const messages = await store.get('conv-1');
+      expect(messages).toHaveLength(1);
+    });
+  });
+
+  describe('clearConversation', () => {
+    it('should remove all messages for a conversation', async () => {
+      await store.append(msg({ id: '1', content: 'A' }));
+      store.clearConversation('conv-1');
+      const messages = await store.get('conv-1');
+      expect(messages).toHaveLength(0);
+    });
+  });
+
+  describe('LRU eviction', () => {
+    it('should evict least-recently-used conversation when capacity exceeded', async () => {
+      const smallStore = new InMemoryConversationStore({ maxConversations: 2 });
+      await smallStore.append(msg({ id: '1', conversationId: 'a' }));
+      await smallStore.append(msg({ id: '2', conversationId: 'b' }));
+      await smallStore.get('a');
+      await smallStore.append(msg({ id: '3', conversationId: 'c' }));
+
+      expect(await smallStore.get('a')).toHaveLength(1);
+      expect(await smallStore.get('c')).toHaveLength(1);
+    });
+  });
+
+  describe('maxMessagesPerConversation', () => {
+    it('should drop oldest messages when cap is exceeded', async () => {
+      const capped = new InMemoryConversationStore({ maxMessagesPerConversation: 3 });
+      for (let i = 1; i <= 5; i++) {
+        await capped.append(msg({
+          id: String(i),
+          content: `msg ${i}`,
+          timestamp: `2024-01-01T00:00:0${i}Z`,
+        }));
+      }
+      const messages = await capped.get('conv-1');
+      expect(messages).toHaveLength(3);
+      expect(messages[0].content).toBe('msg 3');
+      expect(messages[2].content).toBe('msg 5');
+    });
+  });
+
+  describe('isolation between conversations', () => {
+    it('should keep conversations separate', async () => {
+      await store.append(msg({ id: '1', conversationId: 'conv-a', content: 'A' }));
+      await store.append(msg({ id: '2', conversationId: 'conv-b', content: 'B' }));
+
+      const a = await store.get('conv-a');
+      const b = await store.get('conv-b');
+
+      expect(a).toHaveLength(1);
+      expect(b).toHaveLength(1);
+      expect(a[0].content).toBe('A');
+      expect(b[0].content).toBe('B');
+    });
+  });
+});
diff --git a/packages/toolpack-sdk/src/conversation/index.ts b/packages/toolpack-sdk/src/conversation/index.ts
new file mode 100644
index 0000000..b0270c2
--- /dev/null
+++ b/packages/toolpack-sdk/src/conversation/index.ts
@@ -0,0 +1,17 @@
+export type { Participant } from './participant.js';
+
+export type {
+  ConversationScope,
+  StoredMessage,
+  GetOptions,
+  ConversationSearchOptions,
+  AssemblerOptions,
+  PromptMessage,
+  AssembledPrompt,
+  ConversationStore,
+} from './conv-types.js';
+
+export {
+  InMemoryConversationStore,
+  type InMemoryConversationStoreConfig,
+} from './store.js';
diff --git a/packages/toolpack-sdk/src/conversation/participant.ts b/packages/toolpack-sdk/src/conversation/participant.ts
new file mode 100644
index 0000000..ce459ff
--- /dev/null
+++ b/packages/toolpack-sdk/src/conversation/participant.ts
@@ -0,0 +1,21 @@
+/**
+ * A participant in a conversation — a human user, another agent, or the
+ * system itself. Stored alongside each `StoredMessage` so the prompt
+ * assembler can reconstruct who said what without extra lookups.
+ */
+export interface Participant {
+  /** Coarse participant kind */
+  kind: 'system' | 'user' | 'agent';
+
+  /** Stable identifier for this participant (platform-specific id or agent name) */
+  id: string;
+
+  /** Human-readable display name, resolved lazily. Falls back to `id` if unset. */
+  displayName?: string;
+
+  /** For `kind: 'agent'` only: an optional role label for rendering */
+  agentType?: string;
+
+  /** Optional free-form metadata (e.g. platform-specific profile info) */
+  metadata?: Record<string, unknown>;
+}
diff --git a/packages/toolpack-sdk/src/conversation/store.ts b/packages/toolpack-sdk/src/conversation/store.ts
new file mode 100644
index 0000000..770252e
--- /dev/null
+++ b/packages/toolpack-sdk/src/conversation/store.ts
@@ -0,0 +1,158 @@
+import type { ConversationStore, StoredMessage, GetOptions, ConversationSearchOptions } from './conv-types.js';
+
+class ConversationLRU {
+  private readonly capacity: number;
+  private readonly map: Map<string, StoredMessage[]>;
+
+  constructor(capacity: number) {
+    this.capacity = capacity;
+    this.map = new Map();
+  }
+
+  get(key: string): StoredMessage[] | undefined {
+    const value = this.map.get(key);
+    if (value === undefined) return undefined;
+    this.map.delete(key);
+    this.map.set(key, value);
+    return value;
+  }
+
+  set(key: string, value: StoredMessage[]): void {
+    if (this.map.has(key)) {
+      this.map.delete(key);
+    } else if (this.map.size >= this.capacity) {
+      const oldest = this.map.keys().next().value;
+      if (oldest !== undefined) {
+        this.map.delete(oldest);
+      }
+    }
+    this.map.set(key, value);
+  }
+
+  has(key: string): boolean {
+    return this.map.has(key);
+  }
+
+  get size(): number {
+    return this.map.size;
+  }
+}
+
+export interface InMemoryConversationStoreConfig {
+  /** Maximum conversations to keep in memory. Default: 500. */
+  maxConversations?: number;
+  /** Maximum messages per conversation. Default: 500. */
+  maxMessagesPerConversation?: number;
+}
+
+/**
+ * In-memory implementation of `ConversationStore`.
+ *
+ * Good for single-process deployments, local development, and tests.
+ * Memory is bounded by `maxConversations × maxMessagesPerConversation`.
+ *
+ * **Not suitable for multi-process or serverless deployments** — each
+ * process has its own isolated store. For those environments, implement
+ * `ConversationStore` against a shared database.
+ */
+export class InMemoryConversationStore implements ConversationStore {
+  private readonly lru: ConversationLRU;
+  private readonly maxMessagesPerConversation: number;
+
+  constructor(config: InMemoryConversationStoreConfig = {}) {
+    this.lru = new ConversationLRU(config.maxConversations ?? 500);
+    this.maxMessagesPerConversation = config.maxMessagesPerConversation ?? 500;
+  }
+
+  async append(message: StoredMessage): Promise<void> {
+    let messages = this.lru.get(message.conversationId);
+
+    if (!messages) {
+      messages = [];
+      this.lru.set(message.conversationId, messages);
+    }
+
+    if (messages.some(m => m.id === message.id)) {
+      return;
+    }
+
+    messages.push(message);
+    messages.sort((a, b) => a.timestamp.localeCompare(b.timestamp));
+
+    if (messages.length > this.maxMessagesPerConversation) {
+      messages.splice(0, messages.length - this.maxMessagesPerConversation);
+    }
+  }
+
+  async get(conversationId: string, options: GetOptions = {}): Promise<StoredMessage[]> {
+    const messages = this.lru.get(conversationId) ?? [];
+    let result = messages.slice();
+
+    if (options.scope !== undefined) {
+      result = result.filter(m => m.scope === options.scope);
+    }
+
+    if (options.sinceTimestamp !== undefined) {
+      result = result.filter(m => m.timestamp >= options.sinceTimestamp!);
+    }
+
+    if (options.participantIds !== undefined && options.participantIds.length > 0) {
+      const ids = new Set(options.participantIds);
+      result = result.filter(m => ids.has(m.participant.id));
+    }
+
+    if (options.limit !== undefined && result.length > options.limit) {
+      result = result.slice(result.length - options.limit);
+    }
+
+    return result;
+  }
+
+  async search(
+    conversationId: string,
+    query: string,
+    options: ConversationSearchOptions = {}
+  ): Promise<StoredMessage[]> {
+    const messages = this.lru.get(conversationId) ?? [];
+    const queryLower = query.toLowerCase();
+    const limit = options.limit ?? 10;
+    const tokenCap = options.tokenCap ?? 2000;
+
+    const matches = messages
+      .filter(m => m.content.toLowerCase().includes(queryLower))
+      .slice()
+      .reverse();
+
+    const results: StoredMessage[] = [];
+    let tokenCount = 0;
+
+    for (const msg of matches) {
+      if (results.length >= limit) break;
+
+      const msgTokens = Math.ceil(msg.content.length / 4);
+      if (results.length > 0 && tokenCount + msgTokens > tokenCap) break;
+
+      results.push(msg);
+      tokenCount += msgTokens;
+    }
+
+    return results;
+  }
+
+  async deleteMessages(conversationId: string, ids: string[]): Promise<void> {
+    const messages = this.lru.get(conversationId);
+    if (!messages || ids.length === 0) return;
+
+    const idSet = new Set(ids);
+    const kept = messages.filter(m => !idSet.has(m.id));
+    this.lru.set(conversationId, kept);
+  }
+
+  clearConversation(conversationId: string): void {
+    this.lru.set(conversationId, []);
+  }
+
+  get conversationCount(): number {
+    return this.lru.size;
+  }
+}
diff --git a/packages/toolpack-sdk/src/index.ts b/packages/toolpack-sdk/src/index.ts
index 0a0eb9d..17c1a04 100644
--- a/packages/toolpack-sdk/src/index.ts
+++ b/packages/toolpack-sdk/src/index.ts
@@ -6,10 +6,11 @@ export * from './tools/index.js';
 export * from './modes/index.js';
 export * from './workflows/index.js';
 export * from './toolpack.js';
+export * from './conversation/index.js';
 export * from './utils/home-config.js';
 export * from './utils/runtime-config-loader.js';
 export * from './utils/token-counter.js';
 export * from './utils/message-pruner.js';
 export * from './utils/message-summarizer.js';
 export * from './utils/context-window-state.js';
-export * from './mcp/index.js';
\ No newline at end of file
+export * from './mcp/index.js';
diff --git a/packages/toolpack-sdk/src/modes/index.ts b/packages/toolpack-sdk/src/modes/index.ts
index 2924be0..0135666 100644
--- a/packages/toolpack-sdk/src/modes/index.ts
+++ b/packages/toolpack-sdk/src/modes/index.ts
@@ -4,6 +4,7 @@ export { createMode } from './create-mode.js';
 export {
     AGENT_MODE,
     CHAT_MODE,
+    CODING_MODE,
     BUILT_IN_MODES,
     DEFAULT_MODE_NAME,
 } from './built-in-modes.js';
diff --git a/packages/toolpack-sdk/src/providers/index.ts b/packages/toolpack-sdk/src/providers/index.ts
index a84a8ca..f7b06cc 100644
--- a/packages/toolpack-sdk/src/providers/index.ts
+++ b/packages/toolpack-sdk/src/providers/index.ts
@@ -25,5 +25,7 @@ export { getRegisteredSlmModels, getDefaultSlmModel, isRegisteredSlm } from "./o
 export type { SlmModelEntry } from "./ollama/slm-registry.js";
 // OpenAI
 export * from './openai/index.js';
+// OpenRouter
+export * from './openrouter/index.js';
 // Media Utilities
 export * from './media-utils.js';
diff --git a/packages/toolpack-sdk/src/providers/openrouter/index.ts b/packages/toolpack-sdk/src/providers/openrouter/index.ts
new file mode 100644
index 0000000..eb363b2
--- /dev/null
+++ b/packages/toolpack-sdk/src/providers/openrouter/index.ts
@@ -0,0 +1,100 @@
+import { OpenAIAdapter } from '../openai/index.js';
+import { ProviderModelInfo, CompletionRequest, CompletionResponse, CompletionChunk } from '../../types/index.js';
+
+const OPENROUTER_BASE_URL = 'https://openrouter.ai/api/v1';
+
+export interface OpenRouterOptions {
+    siteUrl?: string;
+    siteName?: string;
+}
+
+export class OpenRouterAdapter extends OpenAIAdapter {
+    name = 'openrouter';
+    private readonly _apiKey: string;
+
+    constructor(apiKey: string, options: OpenRouterOptions = {}) {
+        super(apiKey, OPENROUTER_BASE_URL);
+        this._apiKey = apiKey;
+        // Attribution headers (HTTP-Referer, X-Title) are best-effort and only matter for
+        // the OpenRouter leaderboard — they don't affect routing or pricing.
+        // Injecting them requires a protected client in the parent; skip for now.
+        void options;
+    }
+
+    getDisplayName(): string {
+        return 'OpenRouter';
+    }
+
+    supportsFileUpload(): boolean {
+        return false;
+    }
+
+    async generate(request: CompletionRequest): Promise<CompletionResponse> {
+        return super.generate(this.normalizeRequest(request));
+    }
+
+    async *stream(request: CompletionRequest): AsyncGenerator<CompletionChunk> {
+        yield* super.stream(this.normalizeRequest(request));
+    }
+
+    // OpenRouter passes tool_choice straight to the model endpoint with no translation.
+    // Models like Nemotron reject tool_choice: 'none' with a 404. Strip tools entirely
+    // instead — same effect, universally supported.
+    private normalizeRequest(request: CompletionRequest): CompletionRequest {
+        if (request.tool_choice === 'none') {
+            return { ...request, tools: undefined, tool_choice: undefined };
+        }
+        return request;
+    }
+
+    async getModels(): Promise<ProviderModelInfo[]> {
+        try {
+            const res = await fetch(`${OPENROUTER_BASE_URL}/models`, {
+                headers: { Authorization: `Bearer ${this._apiKey}` },
+            });
+            if (!res.ok) return [];
+            const json = await res.json() as { data: any[] };
+            return json.data.map(m => this.mapModel(m));
+        } catch {
+            return [];
+        }
+    }
+
+    private mapModel(m: any): ProviderModelInfo {
+        const modality: string = m.architecture?.modality ?? 'text->text';
+        const hasVision = modality.includes('image');
+        return {
+            id: m.id,
+            displayName: m.name ?? m.id,
+            capabilities: {
+                chat: true,
+                streaming: true,
+                toolCalling: true,
+                embeddings: false,
+                vision: hasVision,
+            },
+            contextWindow: m.context_length ?? undefined,
+            maxOutputTokens: m.top_provider?.max_completion_tokens ?? undefined,
+            inputModalities: hasVision ? ['text', 'image'] : ['text'],
+            outputModalities: ['text'],
+            reasoningTier: null,
+            costTier: this.deriveCostTier(m.pricing),
+        };
+    }
+
+    // OpenRouter pricing.prompt is cost per token in USD.
+    // Multiply by 1e6 to get cost per 1M tokens for comparison.
+    // Thresholds calibrated against real prices (May 2026):
+    //   low    <  $1/1M  (Llama 3, Haiku, GPT-4.1 Mini)
+    //   medium <  $5/1M  (GPT-4.1, Claude Sonnet)
+    //   high   < $20/1M  (GPT-4o, Claude Opus)
+    //   premium >= $20/1M (o3, frontier reasoning models)
+    private deriveCostTier(pricing?: { prompt?: string }): string {
+        if (!pricing?.prompt) return 'unknown';
+        const costPerM = parseFloat(pricing.prompt) * 1_000_000;
+        if (costPerM < 1) return 'low';
+        if (costPerM < 5) return 'medium';
+        if (costPerM < 20) return 'high';
+        return 'premium';
+    }
+}
diff --git a/packages/toolpack-sdk/src/providers/provider-logger.ts b/packages/toolpack-sdk/src/providers/provider-logger.ts
index a56a045..cf89b87 100644
--- a/packages/toolpack-sdk/src/providers/provider-logger.ts
+++ b/packages/toolpack-sdk/src/providers/provider-logger.ts
@@ -1,5 +1,5 @@
-import { appendFileSync } from 'fs';
-import { join } from 'path';
+import { appendFileSync, mkdirSync } from 'fs';
+import { dirname, isAbsolute, join, resolve } from 'path';
 
 export type LogLevel = 'error' | 'warn' | 'info' | 'debug' | 'trace';
 
@@ -15,6 +15,7 @@ export const LEVEL_VALUES: Record<LogLevel, number> = {
 let _enabled = false;
 let _level: LogLevel = 'info';
 let _logFile = join(process.cwd(), 'toolpack-sdk.log');
+let _console = false;
 
 export interface LoggingConfig {
     /** Enable file logging.  Default: false */
@@ -23,6 +24,8 @@ export interface LoggingConfig {
     filePath?: string;
     /** Log level. Default: 'info' */
     level?: LogLevel;
+    /** Mirror log output to console (stderr for error/warn, stdout for others). Default: false */
+    console?: boolean;
 }
 
 function parseLevel(value: string | undefined): LogLevel | undefined {
@@ -63,6 +66,29 @@ export function initLogger(config?: LoggingConfig): void {
     if (process.env.TOOLPACK_SDK_LOG_LEVEL) {
         _level = parseLevel(process.env.TOOLPACK_SDK_LOG_LEVEL) || _level;
     }
+    if (process.env.TOOLPACK_SDK_LOG_CONSOLE !== undefined) {
+        _console = process.env.TOOLPACK_SDK_LOG_CONSOLE === 'true';
+    }
+    if (config?.console !== undefined && process.env.TOOLPACK_SDK_LOG_CONSOLE === undefined) {
+        _console = config.console;
+    }
+
+    // Normalize log file path and ensure its parent directory exists so appendFileSync
+    // doesn't throw ENOENT for relative/nested paths like "./toolpack/logs/kael-debug.log".
+    if (_enabled) {
+        try {
+            _logFile = isAbsolute(_logFile) ? _logFile : resolve(process.cwd(), _logFile);
+            mkdirSync(dirname(_logFile), { recursive: true });
+            // Emit a sentinel line so it's obvious logging is working.
+            appendFileSync(
+                _logFile,
+                `[${new Date().toISOString()}] [INFO] [Logger] initialized level=${_level} file=${_logFile}\n`
+            );
+        } catch (err) {
+            console.warn(`[Toolpack Warning] Failed to initialize log file "${_logFile}": ${(err as Error).message}`);
+            _enabled = false;
+        }
+    }
 }
 
 // ── Public API (unchanged signatures) ────────────────────────────
@@ -83,8 +109,12 @@ export function shouldLog(level: LogLevel): boolean {
 function writeLog(level: LogLevel, message: string): void {
     if (!shouldLog(level)) return;
     const timestamp = new Date().toISOString();
-    const entry = `[${timestamp}] [${level.toUpperCase()}] ${message}\n`;
-    appendFileSync(_logFile, entry);
+    const entry = `[${timestamp}] [${level.toUpperCase()}] ${redact(message)}`;
+    appendFileSync(_logFile, entry + '\n');
+    if (_console) {
+        const fn = level === 'error' ? console.error : level === 'warn' ? console.warn : console.log;
+        fn(entry);
+    }
 }
 
 // ── Level API ────────────────────────────────────────────────────
@@ -110,7 +140,12 @@ export function redact(text: string): string {
         .replace(/\bsk-[A-Za-z0-9_-]{10,}\b/g, '[REDACTED]')
         .replace(/\bsk-proj-[A-Za-z0-9_-]{10,}\b/g, '[REDACTED]')
         .replace(/\bAIza[0-9A-Za-z_-]{10,}\b/g, '[REDACTED]')
-        .replace(/\bBearer\s+[A-Za-z0-9._-]{10,}\b/g, 'Bearer [REDACTED]');
+        .replace(/\bBearer\s+[A-Za-z0-9._-]{10,}\b/g, 'Bearer [REDACTED]')
+        // GitHub tokens
+        .replace(/\bghs_[A-Za-z0-9]{10,}\b/g, 'ghs_[REDACTED]')
+        .replace(/\bghp_[A-Za-z0-9]{10,}\b/g, 'ghp_[REDACTED]')
+        .replace(/\bghu_[A-Za-z0-9]{10,}\b/g, 'ghu_[REDACTED]')
+        .replace(/\bghr_[A-Za-z0-9]{10,}\b/g, 'ghr_[REDACTED]');
 }
 
 export function safePreview(value: unknown, maxLen = 200): string {
diff --git a/packages/toolpack-sdk/src/toolpack.ts b/packages/toolpack-sdk/src/toolpack.ts
index d625919..820366e 100644
--- a/packages/toolpack-sdk/src/toolpack.ts
+++ b/packages/toolpack-sdk/src/toolpack.ts
@@ -8,16 +8,16 @@ import {
     EmbeddingRequest,
     EmbeddingResponse,
 } from './providers/base/index.js';
-import { ProviderInfo, ProviderModelInfo, ContextWindowConfig } from "./types/index.js";
+import { ProviderInfo, ProviderModelInfo, RequestToolDefinition, ContextWindowConfig } from "./types/index.js";
 import { OpenAIAdapter } from './providers/openai/index.js';
 import { AnthropicAdapter } from './providers/anthropic/index.js';
 import { GeminiAdapter } from './providers/gemini/index.js';
 import { OllamaAdapter, OllamaProvider } from './providers/ollama/index.js';
+import { OpenRouterAdapter } from './providers/openrouter/index.js';
 import { getOllamaBaseUrl, loadConfig, discoverConfigPath } from './providers/config.js';
 import { initLogger, logWarn,logError,logInfo } from './providers/provider-logger.js';
 import { ToolRegistry } from './tools/registry.js';
 import { loadToolsConfig, loadFullConfig, ToolProject } from './tools/index.js';
-import { ToolDefinition } from './tools/types.js';
 import { ModeConfig } from './modes/mode-types.js';
 import { ModeRegistry } from './modes/mode-registry.js';
 import { DEFAULT_MODE_NAME } from './modes/built-in-modes.js';
@@ -39,6 +39,12 @@ export interface ProviderOptions {
 
     /** Base URL override (for OpenAI-compatible endpoints or custom Ollama host) */
     baseUrl?: string;
+
+    /** OpenRouter only: your site URL for the leaderboard/attribution header */
+    siteUrl?: string;
+
+    /** OpenRouter only: your site name for the leaderboard/attribution header */
+    siteName?: string;
 }
 
 export interface ToolpackInitConfig {
@@ -101,12 +107,13 @@ export interface ToolpackInitConfig {
 
     /**
      * Optional Knowledge instance for RAG (Retrieval-Augmented Generation).
-     * When provided, the knowledge base will be registered as a tool that the AI can use to search documentation.
+     * When provided, knowledge_search and knowledge_add tools are automatically available
+     * as request-scoped tools that the AI can use to retrieve and store information.
      * Can be null if initialization fails - will be gracefully skipped.
      *
      * Accepts any object with a `toTool()` method (e.g. `Knowledge` from `@toolpack-sdk/knowledge`).
      */
-    knowledge?: KnowledgeInstance | null;
+    knowledge?: KnowledgeInstance | KnowledgeInstance[] | null;
 
     /**
      * Human-in-the-loop configuration for tool confirmation.
@@ -147,6 +154,7 @@ export interface KnowledgeInstance {
         };
         execute: (params: { query: string; limit?: number; threshold?: number; filter?: Record<string, string | number | boolean | { $in: unknown[] } | { $gt: number } | { $lt: number }> }) => Promise<any>;
     };
+    add(content: string, metadata?: Record<string, unknown>): Promise<string>;
     query(text: string, options?: Record<string, unknown>): Promise<any[]>;
     stop(): Promise<void>;
 }
@@ -156,6 +164,7 @@ export class Toolpack extends EventEmitter {
     private activeProviderName: string;
     private modeRegistry: ModeRegistry;
     private workflowExecutor: WorkflowExecutor;
+    private knowledgeLayers: KnowledgeInstance[] = [];
     public customProviderNames: Set<string> = new Set();
     private mcpToolProject: ToolProject | null = null;
 
@@ -176,6 +185,151 @@ export class Toolpack extends EventEmitter {
         this.forwardWorkflowEvents();
     }
 
+    private buildKnowledgeRequestTools(): RequestToolDefinition[] {
+        if (this.knowledgeLayers.length === 0) {
+            return [];
+        }
+
+        // Single layer: delegate directly to its tool (preserves original behavior)
+        if (this.knowledgeLayers.length === 1) {
+            const knowledgeSearchTool = this.knowledgeLayers[0].toTool();
+            const knowledgeAddTool: RequestToolDefinition = {
+                name: 'knowledge_add',
+                displayName: 'Add to Knowledge',
+                description: 'Add important new information to the knowledge base for future reference.',
+                category: 'knowledge',
+                parameters: {
+                    type: 'object',
+                    properties: {
+                        content: {
+                            type: 'string',
+                            description: 'The content to add to the knowledge base.',
+                        },
+                        metadata: {
+                            type: 'object',
+                            description: 'Optional metadata such as source, category, or tags.',
+                        },
+                    },
+                    required: ['content'],
+                },
+                execute: async (args: Record<string, any>) => {
+                    const id = await this.knowledgeLayers[0].add(args.content, args.metadata);
+                    return {
+                        success: true,
+                        id,
+                        message: 'Content added to knowledge base successfully.',
+                    };
+                },
+            };
+            return [knowledgeSearchTool as unknown as RequestToolDefinition, knowledgeAddTool];
+        }
+
+        // Multiple layers: merge search results; add always targets first layer
+        const knowledgeSearchTool: RequestToolDefinition = {
+            name: 'knowledge_search',
+            displayName: 'Knowledge Search',
+            description: `Search across ${this.knowledgeLayers.length} knowledge layers for relevant information.`,
+            category: 'search',
+            cacheable: false,
+            parameters: {
+                type: 'object',
+                properties: {
+                    query: {
+                        type: 'string',
+                        description: 'Search query to find relevant information',
+                    },
+                    limit: {
+                        type: 'number',
+                        description: 'Maximum number of results to return (default: 10)',
+                    },
+                    threshold: {
+                        type: 'number',
+                        description: 'Minimum similarity threshold 0-1 (default: 0.7)',
+                    },
+                    filter: {
+                        type: 'object',
+                        description: 'Optional metadata filters',
+                    },
+                },
+                required: ['query'],
+            },
+            execute: async (args: Record<string, any>) => {
+                // Delegate to each KB's own tool so the result shape matches the
+                // single-layer path exactly ({ content, score, metadata, ... }).
+                // Pass params through verbatim so each KB applies its own defaults.
+                const perLayerResults = await Promise.all(
+                    this.knowledgeLayers.map(async (kb, index) => {
+                        const tool = kb.toTool();
+                        const hits = await tool.execute({
+                            query: args.query,
+                            limit: args.limit,
+                            threshold: args.threshold,
+                            filter: args.filter,
+                        });
+                        return (hits as any[]).map(h => ({ ...h, _layer: index }));
+                    })
+                );
+
+                const allHits = perLayerResults.flat();
+                allHits.sort((a: any, b: any) => (b.score ?? 0) - (a.score ?? 0));
+
+                // Cap the merged list; if no limit was requested, fall back to 10
+                // (matches the tool's documented default).
+                const cap = args.limit ?? 10;
+                return allHits.slice(0, cap);
+            },
+        };
+
+        const knowledgeAddTool: RequestToolDefinition = {
+            name: 'knowledge_add',
+            displayName: 'Add to Knowledge',
+            description: 'Add important new information to the primary knowledge base for future reference.',
+            category: 'knowledge',
+            parameters: {
+                type: 'object',
+                properties: {
+                    content: {
+                        type: 'string',
+                        description: 'The content to add to the knowledge base.',
+                    },
+                    metadata: {
+                        type: 'object',
+                        description: 'Optional metadata such as source, category, or tags.',
+                    },
+                },
+                required: ['content'],
+            },
+            execute: async (args: Record<string, any>) => {
+                // Always add to the first (primary) layer
+                const id = await this.knowledgeLayers[0].add(args.content, args.metadata);
+                return {
+                    success: true,
+                    id,
+                    message: 'Content added to knowledge base successfully.',
+                };
+            },
+        };
+
+        return [knowledgeSearchTool, knowledgeAddTool];
+    }
+
+    private prepareRequest(request: CompletionRequest): CompletionRequest {
+        const requestTools = [...this.buildKnowledgeRequestTools(), ...(request.requestTools || [])];
+        if (requestTools.length === 0) {
+            return request;
+        }
+
+        const merged = new Map<string, RequestToolDefinition>();
+        for (const tool of requestTools) {
+            merged.set(tool.name, tool);
+        }
+
+        return {
+            ...request,
+            requestTools: Array.from(merged.values()),
+        };
+    }
+
     /**
      * Initialize the Toolpack SDK.
      * 
@@ -199,30 +353,6 @@ export class Toolpack extends EventEmitter {
             await registry.loadProjects(config.customTools);
         }
 
-        // Register knowledge base as a tool if provided
-        if (config.knowledge && typeof config.knowledge.toTool === 'function') {
-            try {
-                const knowledgeTool = config.knowledge.toTool();
-                const knowledgeProject: ToolProject = {
-                    manifest: {
-                        key: 'knowledge',
-                        name: 'knowledge',
-                        displayName: 'Knowledge Base',
-                        version: '1.0.0',
-                        description: 'RAG-powered knowledge base search',
-                        tools: ['knowledge_search'],
-                        category: 'search',
-                    },
-                    tools: [knowledgeTool as unknown as ToolDefinition],
-                };
-                await registry.loadProjects([knowledgeProject]);
-                logInfo('[Knowledge] Registered knowledge_search tool');
-            } catch (error) {
-                logError(`[Knowledge] Failed to register knowledge tool: ${error}`);
-                // Continue without knowledge tool rather than failing completely
-            }
-        }
-
         // Load MCP tools from config if provided
         let mcpToolProject: ToolProject | null = null;
         const mcpConfig = config.mcp || fullConfig.mcp;
@@ -387,6 +517,15 @@ export class Toolpack extends EventEmitter {
         });
 
         const instance = new Toolpack(client, defaultProviderName, modeRegistry);
+        // Normalize knowledge to array; null becomes empty array for clean iteration.
+        // Filter out null/undefined entries and any entry missing the expected methods
+        // so that a bad item at config-time can't crash us at tool-execution time.
+        const k = config.knowledge;
+        const rawLayers = k == null ? [] : (Array.isArray(k) ? k : [k]);
+        instance.knowledgeLayers = rawLayers.filter(
+            (x): x is KnowledgeInstance =>
+                !!x && typeof (x as KnowledgeInstance).toTool === 'function'
+        );
         instance.customProviderNames = customProviderNames;
         instance.mcpToolProject = mcpToolProject;
         // 5. Set default mode (and workflow config)
@@ -399,7 +538,6 @@ export class Toolpack extends EventEmitter {
             }
         }
 
-
         return instance;
     }
 
@@ -408,7 +546,7 @@ export class Toolpack extends EventEmitter {
      */
     private static async createProvider(name: string, opts: ProviderOptions, configPath?: string, skipIfNoKey = false): Promise<ProviderAdapter | null> {
         // 1. API Providers
-        if (['openai', 'anthropic', 'gemini'].includes(name)) {
+        if (['openai', 'anthropic', 'gemini', 'openrouter'].includes(name)) {
             const envKey = `TOOLPACK_${name.toUpperCase()}_KEY`;
             const apiKey = opts.apiKey || process.env[envKey] || process.env[`${name.toUpperCase()}_API_KEY`];
 
@@ -423,6 +561,7 @@ export class Toolpack extends EventEmitter {
                 case 'openai': return new OpenAIAdapter(apiKey, opts.baseUrl);
                 case 'anthropic': return new AnthropicAdapter(apiKey, opts.baseUrl);
                 case 'gemini': return new GeminiAdapter(apiKey);
+                case 'openrouter': return new OpenRouterAdapter(apiKey, { siteUrl: opts.siteUrl, siteName: opts.siteName });
             }
         }
 
@@ -463,6 +602,8 @@ export class Toolpack extends EventEmitter {
             req = request;
         }
 
+        req = this.prepareRequest(req);
+
         const mode = this.getMode();
         if (mode?.workflow?.planning?.enabled || mode?.workflow?.steps?.enabled) {
             // Workflow mode: use WorkflowExecutor
@@ -532,17 +673,18 @@ export class Toolpack extends EventEmitter {
     }
 
     async *stream(request: CompletionRequest, providerName?: string): AsyncGenerator<CompletionChunk> {
+        const preparedRequest = this.prepareRequest(request);
         const mode = this.getMode();
         const provider = providerName || this.activeProviderName;
 
         // If mode has workflow enabled, use WorkflowExecutor.stream()
         if (mode?.workflow?.planning?.enabled || mode?.workflow?.steps?.enabled) {
-            yield* this.workflowExecutor.stream(request, provider);
+            yield* this.workflowExecutor.stream(preparedRequest, provider);
             return;
         }
 
         // Direct streaming (no workflow)
-        yield* this.client.stream(request, providerName);
+        yield* this.client.stream(preparedRequest, providerName);
     }
 
     async embed(request: EmbeddingRequest, providerName?: string): Promise<EmbeddingResponse> {
diff --git a/packages/toolpack-sdk/src/tools/github-tools/auth.ts b/packages/toolpack-sdk/src/tools/github-tools/auth.ts
new file mode 100644
index 0000000..d63de21
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/auth.ts
@@ -0,0 +1,149 @@
+/**
+ * GitHub token resolution for toolpack github-tools.
+ *
+ * Resolution order (first match wins):
+ *   1. Explicit token passed by the caller (args.token)
+ *   2. GITHUB_PAT environment variable
+ *   3. GitHub App installation token — minted from GITHUB_APP_ID +
+ *      GITHUB_APP_PRIVATE_KEY; installationId is looked up via the
+ *      repo name when not supplied directly.
+ *
+ * Tokens are cached by installationId (50-minute TTL; GitHub tokens last 60).
+ */
+
+import * as crypto from 'crypto';
+
+interface CachedToken {
+  token: string;
+  expiresAt: number; // epoch ms
+}
+
+const tokenCache = new Map<number, CachedToken>();
+const installationIdCache = new Map<string, number>(); // repo → installationId
+
+/**
+ * Resolve a GitHub API token from multiple sources.
+ *
+ * @param repo - "owner/name" used only for App installation lookup.
+ * @param explicitToken - Token passed directly in tool args (highest priority).
+ */
+export async function resolveGithubToken(
+  repo?: string,
+  explicitToken?: string,
+): Promise<string> {
+  if (explicitToken) return explicitToken;
+
+  const pat = process.env.GITHUB_PAT;
+  if (pat) return pat;
+
+  const appId = process.env.GITHUB_APP_ID;
+  const privateKey = process.env.GITHUB_APP_PRIVATE_KEY?.replace(/\\n/g, '\n');
+  if (!appId || !privateKey) {
+    throw new Error(
+      'No GitHub token available. Set GITHUB_PAT, or GITHUB_APP_ID + GITHUB_APP_PRIVATE_KEY.',
+    );
+  }
+
+  const installationId = await lookupInstallationId(appId, privateKey, repo);
+  return mintInstallationToken(appId, privateKey, installationId);
+}
+
+// ── Internal ──────────────────────────────────────────────────────────────────
+
+async function lookupInstallationId(
+  appId: string,
+  privateKey: string,
+  repo: string | undefined,
+): Promise<number> {
+  if (!repo) {
+    throw new Error(
+      'Cannot resolve GitHub App installation token without a repo name. Pass args.repo or set GITHUB_PAT.',
+    );
+  }
+
+  const cached = installationIdCache.get(repo);
+  if (cached !== undefined) return cached;
+
+  const jwt = signAppJwt(appId, privateKey);
+  const res = await fetch(`https://api.github.com/repos/${repo}/installation`, {
+    headers: {
+      Authorization: `Bearer ${jwt}`,
+      Accept: 'application/vnd.github+json',
+      'X-GitHub-Api-Version': '2022-11-28',
+    },
+  });
+
+  if (!res.ok) {
+    const body = await res.text();
+    throw new Error(
+      `Failed to look up installation for ${repo} (${res.status}): ${body}`,
+    );
+  }
+
+  const data = (await res.json()) as { id: number };
+  installationIdCache.set(repo, data.id);
+  return data.id;
+}
+
+async function mintInstallationToken(
+  appId: string,
+  privateKey: string,
+  installationId: number,
+): Promise<string> {
+  const cached = tokenCache.get(installationId);
+  if (cached && cached.expiresAt > Date.now() + 60_000) {
+    return cached.token;
+  }
+
+  const jwt = signAppJwt(appId, privateKey);
+  const res = await fetch(
+    `https://api.github.com/app/installations/${installationId}/access_tokens`,
+    {
+      method: 'POST',
+      headers: {
+        Authorization: `Bearer ${jwt}`,
+        Accept: 'application/vnd.github+json',
+        'X-GitHub-Api-Version': '2022-11-28',
+      },
+    },
+  );
+
+  if (!res.ok) {
+    const body = await res.text();
+    throw new Error(`Failed to mint installation token (${res.status}): ${body}`);
+  }
+
+  const data = (await res.json()) as { token: string; expires_at: string };
+  tokenCache.set(installationId, {
+    token: data.token,
+    expiresAt: new Date(data.expires_at).getTime(),
+  });
+  return data.token;
+}
+
+function signAppJwt(appId: string, privateKey: string): string {
+  const now = Math.floor(Date.now() / 1000);
+  const header = { alg: 'RS256', typ: 'JWT' };
+  const payload = { iat: now - 30, exp: now + 9 * 60, iss: appId };
+
+  const enc = (obj: unknown): string =>
+    Buffer.from(JSON.stringify(obj))
+      .toString('base64')
+      .replace(/=+$/, '')
+      .replace(/\+/g, '-')
+      .replace(/\//g, '_');
+
+  const data = `${enc(header)}.${enc(payload)}`;
+  const signer = crypto.createSign('RSA-SHA256');
+  signer.update(data);
+  signer.end();
+  return (
+    `${data}.` +
+    signer
+      .sign(privateKey)
+      .toString('base64')
+      .replace(/=+$/, '')
+      .replace(/\+/g, '-')
+      .replace(/\//g, '_')
+  );
+}
diff --git a/packages/toolpack-sdk/src/tools/github-tools/common.ts b/packages/toolpack-sdk/src/tools/github-tools/common.ts
new file mode 100644
index 0000000..5fc427d
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/common.ts
@@ -0,0 +1,9 @@
+export function buildHeaders(token?: string, extra?: Record<string, string>): Record<string, string> {
+  const headers: Record<string, string> = {
+    Accept: 'application/vnd.github+json',
+    'X-GitHub-Api-Version': '2022-11-28',
+    ...(extra || {}),
+  };
+  if (token) headers.Authorization = `Bearer ${token}`;
+  return headers;
+}
diff --git a/packages/toolpack-sdk/src/tools/github-tools/index.ts b/packages/toolpack-sdk/src/tools/github-tools/index.ts
new file mode 100644
index 0000000..0f9f094
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/index.ts
@@ -0,0 +1,54 @@
+import { ToolProject } from '../types.js';
+import { githubGraphqlExecuteTool } from './tools/graphql-execute/index.js';
+import { githubContentsGetTextTool } from './tools/contents-get-text/index.js';
+import { githubPrReviewThreadsListTool } from './tools/pr-review-threads-list/index.js';
+import { githubPrReviewThreadsResolveTool } from './tools/pr-review-threads-resolve/index.js';
+import { githubPrReviewCommentsReplyTool } from './tools/pr-review-comments-reply/index.js';
+import { githubPrDiffGetTool } from './tools/pr-diff-get/index.js';
+import { githubPrFilesListTool } from './tools/pr-files-list/index.js';
+import { githubPrReviewsSubmitTool } from './tools/pr-reviews-submit/index.js';
+import { githubIssuesCommentsCreateTool } from './tools/issues-comments-create/index.js';
+export { githubGraphqlExecuteTool } from './tools/graphql-execute/index.js';
+export { githubContentsGetTextTool } from './tools/contents-get-text/index.js';
+export { githubPrReviewThreadsListTool } from './tools/pr-review-threads-list/index.js';
+export { githubPrReviewThreadsResolveTool } from './tools/pr-review-threads-resolve/index.js';
+export { githubPrReviewCommentsReplyTool } from './tools/pr-review-comments-reply/index.js';
+export { githubPrDiffGetTool } from './tools/pr-diff-get/index.js';
+export { githubPrFilesListTool } from './tools/pr-files-list/index.js';
+export { githubPrReviewsSubmitTool } from './tools/pr-reviews-submit/index.js';
+export { githubIssuesCommentsCreateTool } from './tools/issues-comments-create/index.js';
+
+export const githubToolsProject: ToolProject = {
+  manifest: {
+    key: 'github',
+    name: 'github-tools',
+    displayName: 'GitHub',
+    version: '1.0.0',
+    description: 'GitHub GraphQL/REST tools for PR threads, comments, and contents.',
+    author: 'Toolpack',
+    tools: [
+      'github.graphql.execute',
+      'github.contents.getText',
+      'github.pr.reviewThreads.list',
+      'github.pr.reviewThreads.resolve',
+      'github.pr.reviewComments.reply',
+      'github.pr.diff.get',
+      'github.pr.files.list',
+      'github.pr.reviews.submit',
+      'github.issues.comments.create',
+    ],
+    category: 'network',
+  },
+  tools: [
+    githubGraphqlExecuteTool,
+    githubContentsGetTextTool,
+    githubPrReviewThreadsListTool,
+    githubPrReviewThreadsResolveTool,
+    githubPrReviewCommentsReplyTool,
+    githubPrDiffGetTool,
+    githubPrFilesListTool,
+    githubPrReviewsSubmitTool,
+    githubIssuesCommentsCreateTool,
+  ],
+  dependencies: {},
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/contents-get-text/index.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/contents-get-text/index.ts
new file mode 100644
index 0000000..c6f94ca
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/contents-get-text/index.ts
@@ -0,0 +1,47 @@
+import { ToolDefinition } from '../../../types.js';
+import { name, displayName, description, parameters, category } from './schema.js';
+import { logDebug } from '../../../../providers/provider-logger.js';
+import { buildHeaders } from '../../common.js';
+import { resolveGithubToken } from '../../auth.js';
+import { Buffer } from 'node:buffer';
+
+async function execute(args: Record<string, any>): Promise<string> {
+  const repo = args.repo as string;
+  const path = args.path as string;
+  const ref = args.ref as string | undefined;
+  const token = await resolveGithubToken(repo, args.token as string | undefined);
+  const maxBytes = args.maxBytes ? Number(args.maxBytes) : undefined;
+  const encodedPath = path.split('/').map((s) => encodeURIComponent(s)).join('/');
+  const url = `https://api.github.com/repos/${repo}/contents/${encodedPath}${ref ? `?ref=${encodeURIComponent(ref)}` : ''}`;
+  logDebug(`[github.contents.getText] repo=${repo} path=${path} ref=${ref ?? ''}`);
+
+  const resp = await fetch(url, { method: 'GET', headers: buildHeaders(token) });
+  const text = await resp.text();
+  if (!resp.ok) return `HTTP ${resp.status} ${resp.statusText}\n${text}`;
+
+  try {
+    const json = JSON.parse(text) as any;
+    const b64 = json?.content as string | undefined;
+    if (typeof b64 === 'string') {
+      const raw = Buffer.from(b64.replace(/\n/g, ''), 'base64').toString('utf8');
+      if (maxBytes && Buffer.byteLength(raw, 'utf8') > maxBytes) {
+        const slice = Buffer.from(raw, 'utf8').subarray(0, maxBytes).toString('utf8');
+        const footer = `\n… [truncated, ${maxBytes} of ${Buffer.byteLength(raw, 'utf8')} bytes]`;
+        return `HTTP ${resp.status} ${resp.statusText}\n${slice}${footer}`;
+      }
+      return `HTTP ${resp.status} ${resp.statusText}\n${raw}`;
+    }
+  } catch {
+    // ignore
+  }
+  return `HTTP ${resp.status} ${resp.statusText}\n${text}`;
+}
+
+export const githubContentsGetTextTool: ToolDefinition = {
+  name,
+  displayName,
+  description,
+  parameters,
+  category,
+  execute,
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/contents-get-text/schema.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/contents-get-text/schema.ts
new file mode 100644
index 0000000..0f6db84
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/contents-get-text/schema.ts
@@ -0,0 +1,18 @@
+import { ToolParameters } from '../../../types.js';
+
+export const name = 'github.contents.getText';
+export const displayName = 'Get Repo File (Text)';
+export const description = 'Fetch file content (decoded text) via the GitHub Contents API.';
+export const category = 'github';
+
+export const parameters: ToolParameters = {
+  type: 'object',
+  properties: {
+    repo: { type: 'string', description: 'owner/name (e.g. octo/repo)' },
+    path: { type: 'string', description: 'File path within the repo' },
+    ref: { type: 'string', description: 'Branch, tag, or commit sha' },
+    token: { type: 'string', description: 'GitHub token (App installation or PAT)' },
+    maxBytes: { type: 'integer', description: 'Optional max bytes of decoded text to return; if exceeded, result is truncated with a footer.' },
+  },
+  required: ['repo', 'path'],
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/graphql-execute/index.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/graphql-execute/index.ts
new file mode 100644
index 0000000..04ea8a2
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/graphql-execute/index.ts
@@ -0,0 +1,37 @@
+import { ToolDefinition } from '../../../types.js';
+import { name, displayName, description, parameters, category } from './schema.js';
+import { logDebug } from '../../../../providers/provider-logger.js';
+import { buildHeaders } from '../../common.js';
+import { resolveGithubToken } from '../../auth.js';
+
+async function execute(args: Record<string, any>): Promise<string> {
+  const query = args.query as string;
+  const variables = (args.variables ?? {}) as Record<string, any>;
+  const token = await resolveGithubToken(args.repo as string | undefined, args.token as string | undefined);
+  logDebug(`[github.graphql.execute] query_len=${query?.length ?? 0}`);
+
+  const resp = await fetch('https://api.github.com/graphql', {
+    method: 'POST',
+    headers: buildHeaders(token, { 'Content-Type': 'application/json' }),
+    body: JSON.stringify({ query, variables }),
+  });
+  const text = await resp.text();
+  try {
+    const json = JSON.parse(text) as any;
+    if (json && Array.isArray(json.errors) && json.errors.length > 0) {
+      logDebug(`[github.graphql.execute] errors=${json.errors.length}`);
+    }
+  } catch {
+    // non-JSON body; ignore
+  }
+  return `HTTP ${resp.status} ${resp.statusText}\n${text}`;
+}
+
+export const githubGraphqlExecuteTool: ToolDefinition = {
+  name,
+  displayName,
+  description,
+  parameters,
+  category,
+  execute,
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/graphql-execute/schema.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/graphql-execute/schema.ts
new file mode 100644
index 0000000..cbb88ea
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/graphql-execute/schema.ts
@@ -0,0 +1,23 @@
+import { ToolParameters } from '../../../types.js';
+
+export const name = 'github.graphql.execute';
+export const displayName = 'GitHub GraphQL';
+export const description = [
+  'Execute a GitHub GraphQL query or mutation with standard headers.',
+  'NOTE: GitHub App installation tokens (ghs_*) cannot call certain write mutations.',
+  'The following mutations require a PAT and will return FORBIDDEN with an App token:',
+  'resolveReviewThread, unresolveReviewThread.',
+  'If using an App token, avoid these mutations and use fallback strategies (replies, new comments).',
+].join(' ');
+export const category = 'github';
+
+export const parameters: ToolParameters = {
+  type: 'object',
+  properties: {
+    query: { type: 'string', description: 'GraphQL query string' },
+    variables: { type: 'object', description: 'Optional GraphQL variables' },
+    repo: { type: 'string', description: 'owner/name — used for token resolution when no explicit token is provided' },
+    token: { type: 'string', description: 'GitHub token (App installation or PAT). Optional — omit to auto-resolve from server credentials.' },
+  },
+  required: ['query'],
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/issues-comments-create/index.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/issues-comments-create/index.ts
new file mode 100644
index 0000000..f7d8129
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/issues-comments-create/index.ts
@@ -0,0 +1,30 @@
+import { ToolDefinition } from '../../../types.js';
+import { name, displayName, description, parameters, category } from './schema.js';
+import { buildHeaders } from '../../common.js';
+import { logDebug } from '../../../../providers/provider-logger.js';
+import { resolveGithubToken } from '../../auth.js';
+
+async function execute(args: Record<string, any>): Promise<string> {
+  const repo = String(args.repo);
+  const number = Number(args.number);
+  const body = String(args.body);
+  const token = await resolveGithubToken(repo, args.token as string | undefined);
+  const url = `https://api.github.com/repos/${repo}/issues/${number}/comments`;
+  logDebug(`[github.issues.comments.create] repo=${repo} number=${number}`);
+  const resp = await fetch(url, {
+    method: 'POST',
+    headers: buildHeaders(token, { 'Content-Type': 'application/json' }),
+    body: JSON.stringify({ body }),
+  });
+  const text = await resp.text();
+  return `HTTP ${resp.status} ${resp.statusText}\n${text}`;
+}
+
+export const githubIssuesCommentsCreateTool: ToolDefinition = {
+  name,
+  displayName,
+  description,
+  parameters,
+  category,
+  execute,
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/issues-comments-create/schema.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/issues-comments-create/schema.ts
new file mode 100644
index 0000000..daaa24f
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/issues-comments-create/schema.ts
@@ -0,0 +1,17 @@
+import { ToolParameters } from '../../../types.js';
+
+export const name = 'github.issues.comments.create';
+export const displayName = 'Create Issue/PR Comment';
+export const description = 'Create a comment on an issue or pull request (conversation tab).';
+export const category = 'github';
+
+export const parameters: ToolParameters = {
+  type: 'object',
+  properties: {
+    repo: { type: 'string', description: 'owner/name' },
+    number: { type: 'integer', description: 'Issue or PR number' },
+    body: { type: 'string', description: 'Comment body' },
+    token: { type: 'string', description: 'GitHub token (App installation or PAT)' },
+  },
+  required: ['repo', 'number', 'body'],
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-diff-get/index.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-diff-get/index.ts
new file mode 100644
index 0000000..833f385
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-diff-get/index.ts
@@ -0,0 +1,35 @@
+import { ToolDefinition } from '../../../types.js';
+import { name, displayName, description, parameters, category } from './schema.js';
+import { buildHeaders } from '../../common.js';
+import { logDebug } from '../../../../providers/provider-logger.js';
+import { resolveGithubToken } from '../../auth.js';
+import { Buffer } from 'node:buffer';
+
+async function execute(args: Record<string, any>): Promise<string> {
+  const repo = String(args.repo);
+  const number = Number(args.number);
+  const token = await resolveGithubToken(repo, args.token as string | undefined);
+  const maxBytes = args.maxBytes ? Number(args.maxBytes) : undefined;
+  const url = `https://api.github.com/repos/${repo}/pulls/${number}`;
+  logDebug(`[github.pr.diff.get] repo=${repo} pr=${number}`);
+  const resp = await fetch(url, {
+    method: 'GET',
+    headers: buildHeaders(token, { Accept: 'application/vnd.github.v3.diff' }),
+  });
+  const body = await resp.text();
+  if (maxBytes && Buffer.byteLength(body, 'utf8') > maxBytes) {
+    const slice = Buffer.from(body, 'utf8').subarray(0, maxBytes).toString('utf8');
+    const footer = `\n… [truncated, ${maxBytes} of ${Buffer.byteLength(body, 'utf8')} bytes]`;
+    return `HTTP ${resp.status} ${resp.statusText}\n${slice}${footer}`;
+  }
+  return `HTTP ${resp.status} ${resp.statusText}\n${body}`;
+}
+
+export const githubPrDiffGetTool: ToolDefinition = {
+  name,
+  displayName,
+  description,
+  parameters,
+  category,
+  execute,
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-diff-get/schema.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-diff-get/schema.ts
new file mode 100644
index 0000000..beae22d
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-diff-get/schema.ts
@@ -0,0 +1,17 @@
+import { ToolParameters } from '../../../types.js';
+
+export const name = 'github.pr.diff.get';
+export const displayName = 'Get PR Diff';
+export const description = 'Fetch the unified diff for a pull request (text/patch).';
+export const category = 'github';
+
+export const parameters: ToolParameters = {
+  type: 'object',
+  properties: {
+    repo: { type: 'string', description: 'owner/name' },
+    number: { type: 'integer', description: 'PR number' },
+    token: { type: 'string', description: 'GitHub token (App installation or PAT)' },
+    maxBytes: { type: 'integer', description: 'Optional max bytes of diff to return; if exceeded, result is truncated with a footer.' },
+  },
+  required: ['repo', 'number'],
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-files-list/index.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-files-list/index.ts
new file mode 100644
index 0000000..da42092
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-files-list/index.ts
@@ -0,0 +1,33 @@
+import { ToolDefinition } from '../../../types.js';
+import { name, displayName, description, parameters, category } from './schema.js';
+import { buildHeaders } from '../../common.js';
+import { logDebug } from '../../../../providers/provider-logger.js';
+import { resolveGithubToken } from '../../auth.js';
+
+async function execute(args: Record<string, any>): Promise<string> {
+  const repo = String(args.repo);
+  const number = Number(args.number);
+  const token = await resolveGithubToken(repo, args.token as string | undefined);
+  const perPage = args.perPage ? Number(args.perPage) : undefined;
+  const page = args.page ? Number(args.page) : undefined;
+  const qp = new URLSearchParams();
+  if (perPage) qp.set('per_page', String(perPage));
+  if (page) qp.set('page', String(page));
+  const url = `https://api.github.com/repos/${repo}/pulls/${number}/files${qp.toString() ? `?${qp.toString()}` : ''}`;
+  logDebug(`[github.pr.files.list] repo=${repo} pr=${number} perPage=${perPage ?? ''} page=${page ?? ''}`);
+  const resp = await fetch(url, {
+    method: 'GET',
+    headers: buildHeaders(token),
+  });
+  const text = await resp.text();
+  return `HTTP ${resp.status} ${resp.statusText}\n${text}`;
+}
+
+export const githubPrFilesListTool: ToolDefinition = {
+  name,
+  displayName,
+  description,
+  parameters,
+  category,
+  execute,
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-files-list/schema.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-files-list/schema.ts
new file mode 100644
index 0000000..ce04c36
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-files-list/schema.ts
@@ -0,0 +1,18 @@
+import { ToolParameters } from '../../../types.js';
+
+export const name = 'github.pr.files.list';
+export const displayName = 'List PR Files';
+export const description = 'List files changed in a PR with positions metadata.';
+export const category = 'github';
+
+export const parameters: ToolParameters = {
+  type: 'object',
+  properties: {
+    repo: { type: 'string', description: 'owner/name' },
+    number: { type: 'integer', description: 'PR number' },
+    token: { type: 'string', description: 'GitHub token (App installation or PAT)' },
+    perPage: { type: 'integer', description: 'Results per page (max 100)' },
+    page: { type: 'integer', description: 'Page number' },
+  },
+  required: ['repo', 'number'],
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-comments-reply/index.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-comments-reply/index.ts
new file mode 100644
index 0000000..6622f13
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-comments-reply/index.ts
@@ -0,0 +1,31 @@
+import { ToolDefinition } from '../../../types.js';
+import { name, displayName, description, parameters, category } from './schema.js';
+import { logDebug } from '../../../../providers/provider-logger.js';
+import { buildHeaders } from '../../common.js';
+import { resolveGithubToken } from '../../auth.js';
+
+async function execute(args: Record<string, any>): Promise<string> {
+  const repo = String(args.repo);
+  const number = Number(args.number);
+  const inReplyTo = Number(args.inReplyTo);
+  const body = String(args.body);
+  const token = await resolveGithubToken(repo, args.token as string | undefined);
+  const url = `https://api.github.com/repos/${repo}/pulls/${number}/comments/${inReplyTo}/replies`;
+  logDebug(`[github.pr.reviewComments.reply] repo=${repo} inReplyTo=${inReplyTo}`);
+  const resp = await fetch(url, {
+    method: 'POST',
+    headers: buildHeaders(token, { 'Content-Type': 'application/json' }),
+    body: JSON.stringify({ body }),
+  });
+  const text = await resp.text();
+  return `HTTP ${resp.status} ${resp.statusText}\n${text}`;
+}
+
+export const githubPrReviewCommentsReplyTool: ToolDefinition = {
+  name,
+  displayName,
+  description,
+  parameters,
+  category,
+  execute,
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-comments-reply/schema.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-comments-reply/schema.ts
new file mode 100644
index 0000000..d2b05c7
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-comments-reply/schema.ts
@@ -0,0 +1,18 @@
+import { ToolParameters } from '../../../types.js';
+
+export const name = 'github.pr.reviewComments.reply';
+export const displayName = 'Reply to Review Comment';
+export const description = 'Reply within an existing PR review thread to maintain continuity.';
+export const category = 'github';
+
+export const parameters: ToolParameters = {
+  type: 'object',
+  properties: {
+    repo: { type: 'string', description: 'owner/name' },
+    number: { type: 'integer', description: 'PR number' },
+    inReplyTo: { type: 'integer', description: 'databaseId of the review comment to reply to' },
+    body: { type: 'string', description: 'Reply body' },
+    token: { type: 'string', description: 'GitHub token (App installation or PAT)' },
+  },
+  required: ['repo', 'number', 'inReplyTo', 'body'],
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-list/index.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-list/index.ts
new file mode 100644
index 0000000..ecdd5e7
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-list/index.ts
@@ -0,0 +1,61 @@
+import { ToolDefinition } from '../../../types.js';
+import { name, displayName, description, parameters, category } from './schema.js';
+import { buildHeaders } from '../../common.js';
+import { logDebug } from '../../../../providers/provider-logger.js';
+import { resolveGithubToken } from '../../auth.js';
+
+async function execute(args: Record<string, any>): Promise<string> {
+  const [owner, repoName] = String(args.repo).split('/');
+  const number = Number(args.number);
+  const token = await resolveGithubToken(args.repo as string, args.token as string | undefined);
+  const unresolvedOnly = Boolean(args.unresolvedOnly);
+  const first = args.first ? Number(args.first) : 100;
+  const after = args.after ? String(args.after) : undefined;
+  const commentsFirst = args.commentsFirst ? Number(args.commentsFirst) : 20;
+  const includeMeta = Boolean(args.includeMeta);
+  logDebug(`[github.pr.reviewThreads.list] repo=${owner}/${repoName} pr=${number} unresolvedOnly=${unresolvedOnly} first=${first} after=${after ?? ''} commentsFirst=${commentsFirst} includeMeta=${includeMeta}`);
+  const query = `query($owner:String!,$name:String!,$number:Int!,$first:Int!,$after:String,$commentsFirst:Int!){
+    repository(owner:$owner,name:$name){
+      pullRequest(number:$number){
+        headRefOid
+        reviewThreads(first:$first, after:$after){
+          pageInfo{ hasNextPage endCursor }
+          nodes{ id isResolved isOutdated comments(first:$commentsFirst){ nodes{ databaseId body author{login} path } } }
+        }
+      }
+    }
+  }`;
+  const resp = await fetch('https://api.github.com/graphql', {
+    method: 'POST',
+    headers: buildHeaders(token, { 'Content-Type': 'application/json' }),
+    body: JSON.stringify({ query, variables: { owner, name: repoName, number, first, after, commentsFirst } }),
+  });
+  const raw = await resp.text();
+  if (!resp.ok) return `HTTP ${resp.status} ${resp.statusText}\n${raw}`;
+  try {
+    const json = JSON.parse(raw) as any;
+    if (json && Array.isArray(json.errors) && json.errors.length > 0) {
+      logDebug(`[github.pr.reviewThreads.list] errors=${json.errors.length}`);
+    }
+    const pr = json?.data?.repository?.pullRequest;
+    const pageInfo = pr?.reviewThreads?.pageInfo ?? { hasNextPage: false, endCursor: null };
+    let nodes = pr?.reviewThreads?.nodes ?? [];
+    if (unresolvedOnly) nodes = nodes.filter((n: any) => n?.isResolved === false);
+    if (includeMeta) {
+      const result = { headRefOid: pr?.headRefOid, threads: nodes, pageInfo };
+      return `HTTP 200 OK\n${JSON.stringify(result)}`;
+    }
+    return `HTTP 200 OK\n${JSON.stringify(nodes)}`;
+  } catch {
+    return `HTTP ${resp.status} ${resp.statusText}\n${raw}`;
+  }
+}
+
+export const githubPrReviewThreadsListTool: ToolDefinition = {
+  name,
+  displayName,
+  description,
+  parameters,
+  category,
+  execute,
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-list/schema.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-list/schema.ts
new file mode 100644
index 0000000..21dbb29
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-list/schema.ts
@@ -0,0 +1,21 @@
+import { ToolParameters } from '../../../types.js';
+
+export const name = 'github.pr.reviewThreads.list';
+export const displayName = 'List PR Review Threads';
+export const description = 'List PR review threads via GraphQL (optionally unresolved only).';
+export const category = 'github';
+
+export const parameters: ToolParameters = {
+  type: 'object',
+  properties: {
+    repo: { type: 'string', description: 'owner/name' },
+    number: { type: 'integer', description: 'PR number' },
+    token: { type: 'string', description: 'GitHub token (App installation or PAT)' },
+    unresolvedOnly: { type: 'boolean', description: 'If true, filter unresolved threads only' },
+    first: { type: 'integer', description: 'Threads page size (max 100). Default 100.' },
+    after: { type: 'string', description: 'Cursor for pagination (GraphQL pageInfo.endCursor).' },
+    commentsFirst: { type: 'integer', description: 'Comments per thread (max 100). Default 20.' },
+    includeMeta: { type: 'boolean', description: 'If true, return { headRefOid, threads, pageInfo } instead of array.' },
+  },
+  required: ['repo', 'number'],
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-resolve/index.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-resolve/index.ts
new file mode 100644
index 0000000..b736d82
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-resolve/index.ts
@@ -0,0 +1,44 @@
+import { ToolDefinition } from '../../../types.js';
+import { name, displayName, description, parameters, category } from './schema.js';
+import { buildHeaders } from '../../common.js';
+import { logDebug } from '../../../../providers/provider-logger.js';
+import { resolveGithubToken } from '../../auth.js';
+
+async function execute(args: Record<string, any>): Promise<string> {
+  const id = String(args.threadId);
+  const token = await resolveGithubToken(args.repo as string | undefined, args.token as string | undefined);
+  logDebug(`[github.pr.reviewThreads.resolve] threadId=${id}`);
+  const mutation = 'mutation($id:ID!){ resolveReviewThread(input:{threadId:$id}) { thread { id isResolved } } }';
+  const resp = await fetch('https://api.github.com/graphql', {
+    method: 'POST',
+    headers: buildHeaders(token, { 'Content-Type': 'application/json' }),
+    body: JSON.stringify({ query: mutation, variables: { id } }),
+  });
+  const text = await resp.text();
+  // GitHub App installation tokens (ghs_*) cannot resolve review threads —
+  // the resolveReviewThread mutation requires a user identity (PAT or user OAuth token).
+  // Detect this and return an actionable message so the AI can gracefully fall back.
+  if (resp.ok) {
+    try {
+      const json = JSON.parse(text) as { errors?: Array<{ type?: string; message?: string }> };
+      const forbidden = json.errors?.find((e) => e.type === 'FORBIDDEN');
+      if (forbidden) {
+        return [
+          'TOOL_UNSUPPORTED_FOR_TOKEN_TYPE: resolveReviewThread is not available for GitHub App installation tokens (ghs_*).',
+          'GitHub requires a user identity (PAT with repo scope) for this operation.',
+          'Fallback action: post a reply on the thread acknowledging the fix and ask the author to resolve it manually.',
+        ].join(' ');
+      }
+    } catch { /* non-JSON — fall through to raw response */ }
+  }
+  return `HTTP ${resp.status} ${resp.statusText}\n${text}`;
+}
+
+export const githubPrReviewThreadsResolveTool: ToolDefinition = {
+  name,
+  displayName,
+  description,
+  parameters,
+  category,
+  execute,
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-resolve/schema.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-resolve/schema.ts
new file mode 100644
index 0000000..e35672a
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-review-threads-resolve/schema.ts
@@ -0,0 +1,22 @@
+import { ToolParameters } from '../../../types.js';
+
+export const name = 'github.pr.reviewThreads.resolve';
+export const displayName = 'Resolve Review Thread';
+export const description = [
+  'Resolve a PR review thread via GraphQL resolveReviewThread mutation.',
+  'IMPORTANT: GitHub App installation tokens (ghs_*) cannot call this mutation — GitHub returns FORBIDDEN.',
+  'This tool only works with a Personal Access Token (PAT) that has repo scope.',
+  'If you are using a GitHub App installation token, do NOT call this tool.',
+  'Instead, post a reply on the thread acknowledging the fix and ask the author to resolve it manually.',
+].join(' ');
+export const category = 'github';
+
+export const parameters: ToolParameters = {
+  type: 'object',
+  properties: {
+    threadId: { type: 'string', description: 'GraphQL node ID of the review thread' },
+    repo: { type: 'string', description: 'owner/name — used for token resolution when no explicit token is provided' },
+    token: { type: 'string', description: 'GitHub token — MUST be a PAT with repo scope. App installation tokens (ghs_*) will receive FORBIDDEN.' },
+  },
+  required: ['threadId'],
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-reviews-submit/index.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-reviews-submit/index.ts
new file mode 100644
index 0000000..a2f8253
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-reviews-submit/index.ts
@@ -0,0 +1,38 @@
+import { ToolDefinition } from '../../../types.js';
+import { name, displayName, description, parameters, category } from './schema.js';
+import { buildHeaders } from '../../common.js';
+import { logDebug } from '../../../../providers/provider-logger.js';
+import { resolveGithubToken } from '../../auth.js';
+
+async function execute(args: Record<string, any>): Promise<string> {
+  const repo = String(args.repo);
+  const number = Number(args.number);
+  const event = String(args.event);
+  const body = args.body ? String(args.body) : undefined;
+  const comments = Array.isArray(args.comments) ? args.comments : undefined;
+  const token = await resolveGithubToken(repo, args.token as string | undefined);
+
+  const url = `https://api.github.com/repos/${repo}/pulls/${number}/reviews`;
+  logDebug(`[github.pr.reviews.submit] repo=${repo} pr=${number} event=${event} comments=${comments?.length ?? 0}`);
+
+  const payload: any = { event };
+  if (body) payload.body = body;
+  if (comments && comments.length > 0) payload.comments = comments;
+
+  const resp = await fetch(url, {
+    method: 'POST',
+    headers: buildHeaders(token, { 'Content-Type': 'application/json' }),
+    body: JSON.stringify(payload),
+  });
+  const text = await resp.text();
+  return `HTTP ${resp.status} ${resp.statusText}\n${text}`;
+}
+
+export const githubPrReviewsSubmitTool: ToolDefinition = {
+  name,
+  displayName,
+  description,
+  parameters,
+  category,
+  execute,
+};
diff --git a/packages/toolpack-sdk/src/tools/github-tools/tools/pr-reviews-submit/schema.ts b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-reviews-submit/schema.ts
new file mode 100644
index 0000000..bd2d545
--- /dev/null
+++ b/packages/toolpack-sdk/src/tools/github-tools/tools/pr-reviews-submit/schema.ts
@@ -0,0 +1,25 @@
+import { ToolParameters } from '../../../types.js';
+
+export const name = 'github.pr.reviews.submit';
+export const displayName = 'Submit PR Review';
+export const description = 'Submit a PR review (APPROVE, REQUEST_CHANGES, or COMMENT), optionally with inline comments.';
+export const category = 'github';
+
+export const parameters: ToolParameters = {
+  type: 'object',
+  properties: {
+    repo: { type: 'string', description: 'owner/name' },
+    number: { type: 'integer', description: 'PR number' },
+    event: { type: 'string', description: 'Review event', enum: ['APPROVE','REQUEST_CHANGES','COMMENT'] },
+    body: { type: 'string', description: 'Top-level review body', },
+    comments: { type: 'array', description: 'Optional inline comments array', items: {
+      type: 'object', properties: {
+        path: { type: 'string', description: 'File path' },
+        position: { type: 'integer', description: 'Position in the diff' },
+        body: { type: 'string', description: 'Comment body' },
+      }, required: ['path','position','body']
+    }},
+    token: { type: 'string', description: 'GitHub token (App installation or PAT)' },
+  },
+  required: ['repo', 'number', 'event'],
+};
diff --git a/packages/toolpack-sdk/src/tools/index.ts b/packages/toolpack-sdk/src/tools/index.ts
index 6889679..8e4e9e6 100644
--- a/packages/toolpack-sdk/src/tools/index.ts
+++ b/packages/toolpack-sdk/src/tools/index.ts
@@ -36,6 +36,19 @@ export {
     httpGetTool, httpPostTool, httpPutTool, httpDeleteTool, httpDownloadTool,
 } from './http-tools/index.js';
 
+// github-tools
+export {
+    githubToolsProject,
+    githubGraphqlExecuteTool,
+    githubContentsGetTextTool,
+    githubPrReviewThreadsListTool,
+    githubPrReviewThreadsResolveTool,
+    githubPrReviewCommentsReplyTool,
+    githubPrDiffGetTool,
+    githubPrFilesListTool,
+    githubPrReviewsSubmitTool,
+} from './github-tools/index.js';
+
 // web-tools
 export {
     webToolsProject,
diff --git a/packages/toolpack-sdk/src/tools/registry.ts b/packages/toolpack-sdk/src/tools/registry.ts
index fa60d3b..173b9af 100644
--- a/packages/toolpack-sdk/src/tools/registry.ts
+++ b/packages/toolpack-sdk/src/tools/registry.ts
@@ -228,12 +228,13 @@ export class ToolRegistry {
         const { execToolsProject } = await import('./exec-tools/index.js');
         const { systemToolsProject } = await import('./system-tools/index.js');
         const { httpToolsProject } = await import('./http-tools/index.js');
+        const { githubToolsProject } = await import('./github-tools/index.js');
         const { webToolsProject } = await import('./web-tools/index.js');
         const { codingToolsProject } = await import('./coding-tools/index.js');
         const { gitToolsProject } = await import('./git-tools/index.js');
         const { diffToolsProject } = await import('./diff-tools/index.js');
         const { dbToolsProject } = await import('./db-tools/index.js');
         const { cloudToolsProject } = await import('./cloud-tools/index.js');
-        await this.loadProjects([fsToolsProject, execToolsProject, systemToolsProject, httpToolsProject, webToolsProject, codingToolsProject, gitToolsProject, diffToolsProject, dbToolsProject, cloudToolsProject]);
+        await this.loadProjects([fsToolsProject, execToolsProject, systemToolsProject, httpToolsProject, githubToolsProject, webToolsProject, codingToolsProject, gitToolsProject, diffToolsProject, dbToolsProject, cloudToolsProject]);
     }
 }
diff --git a/packages/toolpack-sdk/src/types/index.ts b/packages/toolpack-sdk/src/types/index.ts
index fee33ed..a99ec2a 100644
--- a/packages/toolpack-sdk/src/types/index.ts
+++ b/packages/toolpack-sdk/src/types/index.ts
@@ -90,6 +90,17 @@ export interface ToolCallRequest {
     function: ToolCallFunction;
 }
 
+export interface RequestToolDefinition {
+    name: string;
+    displayName: string;
+    description: string;
+    parameters: Record<string, any>;
+    category: string;
+    execute: (args: Record<string, any>) => Promise<any>;
+    cacheable?: boolean;
+    confirmation?: import('../tools/types.js').ToolConfirmation;
+}
+
 export interface ToolCallResult {
     id: string;
     name: string;
@@ -107,6 +118,7 @@ export interface CompletionRequest {
     response_format?: 'text' | 'json_object';
     stream?: boolean;
     tools?: ToolCallRequest[];
+    requestTools?: RequestToolDefinition[];
     tool_choice?: 'auto' | 'none' | 'required';
     /** AbortSignal to cancel the request */
     signal?: AbortSignal;
diff --git a/packages/toolpack-sdk/tests/integration/knowledge-tools.test.ts b/packages/toolpack-sdk/tests/integration/knowledge-tools.test.ts
new file mode 100644
index 0000000..da58142
--- /dev/null
+++ b/packages/toolpack-sdk/tests/integration/knowledge-tools.test.ts
@@ -0,0 +1,588 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+import { Toolpack } from '../../src/toolpack.js';
+import type { KnowledgeInstance } from '../../src/toolpack.js';
+import type { RequestToolDefinition } from '../../src/types/index.js';
+
+describe('Knowledge Tools Integration', () => {
+  let mockKnowledge: KnowledgeInstance;
+  let addedChunks: Array<{ id: string; content: string; metadata?: Record<string, unknown> }>;
+
+  beforeEach(() => {
+    addedChunks = [];
+    
+    mockKnowledge = {
+      toTool: vi.fn().mockReturnValue({
+        name: 'knowledge_search',
+        displayName: 'Knowledge Search',
+        description: 'Search the knowledge base for relevant information',
+        category: 'search',
+        parameters: {
+          type: 'object',
+          properties: {
+            query: { type: 'string', description: 'Search query' },
+            limit: { type: 'number', description: 'Maximum results' },
+          },
+          required: ['query'],
+        },
+        execute: vi.fn().mockImplementation(async (args: { query: string; limit?: number }) => {
+          // Simple search implementation for testing
+          const results = addedChunks.filter(chunk => 
+            chunk.content.toLowerCase().includes(args.query.toLowerCase())
+          ).slice(0, args.limit || 5);
+          
+          return results.map(chunk => ({
+            id: chunk.id,
+            content: chunk.content,
+            metadata: chunk.metadata,
+            score: 0.9,
+          }));
+        }),
+      }),
+      add: vi.fn().mockImplementation(async (content: string, metadata?: Record<string, unknown>) => {
+        const id = `chunk-${Date.now()}-${Math.random().toString(36).substr(2, 9)}`;
+        addedChunks.push({ id, content, metadata });
+        return id;
+      }),
+      query: vi.fn().mockResolvedValue([]),
+      stop: vi.fn().mockResolvedValue(undefined),
+    };
+  });
+
+  describe('knowledge_add tool', () => {
+    it('should create knowledge_add tool when knowledge is configured', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: mockKnowledge,
+      });
+
+      // Access the private prepareRequest method for testing
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      // Verify both knowledge tools are present
+      expect(request.requestTools).toBeDefined();
+      expect(request.requestTools).toHaveLength(2);
+      
+      const knowledgeSearchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+      const knowledgeAddTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_add');
+      
+      expect(knowledgeSearchTool).toBeDefined();
+      expect(knowledgeAddTool).toBeDefined();
+    });
+
+    it('should have correct structure for knowledge_add tool', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: mockKnowledge,
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const knowledgeAddTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_add');
+      
+      expect(knowledgeAddTool).toMatchObject({
+        name: 'knowledge_add',
+        displayName: 'Add to Knowledge',
+        description: 'Add important new information to the knowledge base for future reference.',
+        category: 'knowledge',
+      });
+
+      expect(knowledgeAddTool?.parameters).toEqual({
+        type: 'object',
+        properties: {
+          content: {
+            type: 'string',
+            description: 'The content to add to the knowledge base.',
+          },
+          metadata: {
+            type: 'object',
+            description: 'Optional metadata such as source, category, or tags.',
+          },
+        },
+        required: ['content'],
+      });
+
+      expect(typeof knowledgeAddTool?.execute).toBe('function');
+    });
+
+    it('should add content to knowledge base via knowledge_add tool', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: mockKnowledge,
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const knowledgeAddTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_add');
+      expect(knowledgeAddTool).toBeDefined();
+
+      // Execute the tool to add content
+      const result = await knowledgeAddTool!.execute({
+        content: 'The API rate limit is 100 requests per minute',
+        metadata: { source: 'documentation', category: 'api' },
+      });
+
+      // Verify add was called with correct arguments
+      expect(mockKnowledge.add).toHaveBeenCalledWith(
+        'The API rate limit is 100 requests per minute',
+        { source: 'documentation', category: 'api' }
+      );
+
+      // Verify response structure
+      expect(result).toMatchObject({
+        success: true,
+        message: 'Content added to knowledge base successfully.',
+      });
+      expect(result.id).toBeDefined();
+      expect(typeof result.id).toBe('string');
+    });
+
+    it('should add content without metadata', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: mockKnowledge,
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const knowledgeAddTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_add');
+      
+      const result = await knowledgeAddTool!.execute({
+        content: 'Important information without metadata',
+      });
+
+      expect(mockKnowledge.add).toHaveBeenCalledWith(
+        'Important information without metadata',
+        undefined
+      );
+
+      expect(result).toMatchObject({
+        success: true,
+        message: 'Content added to knowledge base successfully.',
+      });
+    });
+  });
+
+  describe('knowledge_add and knowledge_search integration', () => {
+    it('should add content and then find it via search', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: mockKnowledge,
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const knowledgeAddTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_add');
+      const knowledgeSearchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+      
+      expect(knowledgeAddTool).toBeDefined();
+      expect(knowledgeSearchTool).toBeDefined();
+
+      // Add content
+      await knowledgeAddTool!.execute({
+        content: 'The API rate limit is 100 requests per minute',
+        metadata: { source: 'documentation' },
+      });
+
+      await knowledgeAddTool!.execute({
+        content: 'Authentication requires an API key in the header',
+        metadata: { source: 'documentation' },
+      });
+
+      await knowledgeAddTool!.execute({
+        content: 'The database supports PostgreSQL and MySQL',
+        metadata: { source: 'technical-specs' },
+      });
+
+      // Search for added content
+      const searchResults = await knowledgeSearchTool!.execute({
+        query: 'API',
+        limit: 10,
+      });
+
+      // Verify search finds the added content
+      expect(searchResults).toHaveLength(2);
+      expect(searchResults[0].content).toContain('rate limit');
+      expect(searchResults[1].content).toContain('Authentication');
+      expect(searchResults[0].metadata).toEqual({ source: 'documentation' });
+    });
+
+    it('should handle multiple add operations and search correctly', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: mockKnowledge,
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const knowledgeAddTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_add');
+      const knowledgeSearchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+
+      // Add multiple pieces of information
+      const topics = [
+        'Python is a high-level programming language',
+        'JavaScript runs in the browser and on Node.js',
+        'TypeScript adds static typing to JavaScript',
+        'Rust is a systems programming language',
+      ];
+
+      for (const topic of topics) {
+        await knowledgeAddTool!.execute({ content: topic });
+      }
+
+      // Search for JavaScript-related content
+      const jsResults = await knowledgeSearchTool!.execute({
+        query: 'JavaScript',
+        limit: 5,
+      });
+
+      expect(jsResults).toHaveLength(2);
+      expect(jsResults.some((r: any) => r.content.includes('browser'))).toBe(true);
+      expect(jsResults.some((r: any) => r.content.includes('TypeScript'))).toBe(true);
+
+      // Search for programming languages
+      const langResults = await knowledgeSearchTool!.execute({
+        query: 'programming language',
+        limit: 5,
+      });
+
+      // At least Python and Rust should match
+      expect(langResults.length).toBeGreaterThanOrEqual(2);
+    });
+
+    it('should return empty results when search finds nothing', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: mockKnowledge,
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const knowledgeSearchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+
+      // Search without adding any content
+      const results = await knowledgeSearchTool!.execute({
+        query: 'nonexistent content',
+        limit: 5,
+      });
+
+      expect(results).toHaveLength(0);
+    });
+  });
+
+  describe('knowledge tools not present when knowledge is not configured', () => {
+    it('should not include knowledge tools when knowledge is not provided', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        // No knowledge configured
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      // Should have no request tools
+      expect(request.requestTools).toBeUndefined();
+    });
+
+    it('should not include knowledge tools when knowledge is null', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: null,
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      expect(request.requestTools).toBeUndefined();
+    });
+
+    it('should not include knowledge tools when knowledge is empty array', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: [],
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      expect(request.requestTools).toBeUndefined();
+    });
+  });
+
+  describe('multiple knowledge layers (array)', () => {
+    let primaryKB: KnowledgeInstance;
+    let secondaryKB: KnowledgeInstance;
+
+    beforeEach(() => {
+      // Primary KB returns high scores
+      primaryKB = {
+        toTool: vi.fn().mockReturnValue({
+          name: 'knowledge_search',
+          displayName: 'Knowledge Search',
+          description: 'Primary knowledge',
+          category: 'search',
+          parameters: { type: 'object', properties: {}, required: [] },
+          execute: vi.fn().mockImplementation(async () => [
+            { id: 'p1', content: 'primary result A', score: 0.95, metadata: { source: 'primary' } },
+            { id: 'p2', content: 'primary result B', score: 0.85, metadata: { source: 'primary' } },
+          ]),
+        }),
+        add: vi.fn().mockResolvedValue('primary-chunk-id'),
+        query: vi.fn().mockResolvedValue([]),
+        stop: vi.fn().mockResolvedValue(undefined),
+      };
+
+      // Secondary KB returns lower scores
+      secondaryKB = {
+        toTool: vi.fn().mockReturnValue({
+          name: 'knowledge_search',
+          displayName: 'Knowledge Search',
+          description: 'Secondary knowledge',
+          category: 'search',
+          parameters: { type: 'object', properties: {}, required: [] },
+          execute: vi.fn().mockImplementation(async () => [
+            { id: 's1', content: 'secondary result C', score: 0.90, metadata: { source: 'secondary' } },
+            { id: 's2', content: 'secondary result D', score: 0.80, metadata: { source: 'secondary' } },
+          ]),
+        }),
+        add: vi.fn().mockResolvedValue('secondary-chunk-id'),
+        query: vi.fn().mockResolvedValue([]),
+        stop: vi.fn().mockResolvedValue(undefined),
+      };
+    });
+
+    it('should merge and sort results from multiple layers by score', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: [primaryKB, secondaryKB],
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const searchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+      expect(searchTool).toBeDefined();
+
+      const results = await searchTool!.execute({ query: 'test' });
+
+      // Should be sorted by score descending
+      expect(results[0].score).toBe(0.95);
+      expect(results[1].score).toBe(0.90);
+      expect(results[2].score).toBe(0.85);
+      expect(results[3].score).toBe(0.80);
+    });
+
+    it('should tag each result with _layer index', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: [primaryKB, secondaryKB],
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const searchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+      const results = await searchTool!.execute({ query: 'test' });
+
+      // primaryKB results should have _layer: 0, secondaryKB _layer: 1
+      expect(results[0]._layer).toBe(0); // 0.95 from primary
+      expect(results[1]._layer).toBe(1); // 0.90 from secondary
+      expect(results[2]._layer).toBe(0); // 0.85 from primary
+      expect(results[3]._layer).toBe(1); // 0.80 from secondary
+    });
+
+    it('should respect limit across merged results', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: [primaryKB, secondaryKB],
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const searchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+      const results = await searchTool!.execute({ query: 'test', limit: 2 });
+
+      expect(results).toHaveLength(2);
+      expect(results[0].score).toBe(0.95);
+      expect(results[1].score).toBe(0.90);
+    });
+
+    it('should default limit to 10 when not specified', async () => {
+      primaryKB.toTool = vi.fn().mockReturnValue({
+        name: 'knowledge_search',
+        displayName: 'Knowledge Search',
+        description: 'Primary',
+        category: 'search',
+        parameters: { type: 'object', properties: {}, required: [] },
+        execute: vi.fn().mockImplementation(async () =>
+          Array.from({ length: 8 }, (_, i) => ({ id: `p${i}`, content: 'item', score: 0.9 - i * 0.01 }))
+        ),
+      });
+
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: [primaryKB, secondaryKB],
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const searchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+      const results = await searchTool!.execute({ query: 'test' }); // no limit
+
+      // 8 + 4 = 12 possible, capped at 10
+      expect(results.length).toBeLessThanOrEqual(10);
+    });
+
+    it('should have correct tool description mentioning multiple layers', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: [primaryKB, secondaryKB],
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const searchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+      expect(searchTool!.description).toContain('2 knowledge layers');
+    });
+
+    it('should add content to the first (primary) layer only', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: [primaryKB, secondaryKB],
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const addTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_add');
+      expect(addTool).toBeDefined();
+      expect(addTool!.description).toContain('primary knowledge base');
+
+      await addTool!.execute({ content: 'new chunk', metadata: { tag: 'test' } });
+
+      expect(primaryKB.add).toHaveBeenCalledWith('new chunk', { tag: 'test' });
+      expect(secondaryKB.add).not.toHaveBeenCalled();
+    });
+
+    it('should filter out null/undefined entries in array', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: [primaryKB, null, secondaryKB, undefined] as any,
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      // Should still work with just the valid entries
+      const searchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+      expect(searchTool).toBeDefined();
+
+      const results = await searchTool!.execute({ query: 'test' });
+      // Should merge from 2 valid KBs
+      expect(results).toHaveLength(4);
+    });
+
+    it('should filter out entries missing toTool method', async () => {
+      const invalidKB = { add: vi.fn(), query: vi.fn(), stop: vi.fn() } as any; // no toTool
+
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: [primaryKB, invalidKB, secondaryKB] as any,
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      const searchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+      const results = await searchTool!.execute({ query: 'test' });
+
+      // Should merge from 2 valid KBs, invalid entry ignored
+      expect(results).toHaveLength(4);
+    });
+
+    it('should behave identically to single KB when array has one element', async () => {
+      const toolpack = await Toolpack.init({
+        provider: 'openai',
+        apiKey: 'test-key',
+        knowledge: [mockKnowledge],
+      });
+
+      const request = (toolpack as any).prepareRequest({
+        messages: [{ role: 'user', content: 'test' }],
+        model: 'gpt-4',
+      });
+
+      // Should have same tools as single-KB path
+      expect(request.requestTools).toHaveLength(2);
+
+      const searchTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_search');
+      const addTool = request.requestTools?.find((t: RequestToolDefinition) => t.name === 'knowledge_add');
+
+      expect(searchTool).toBeDefined();
+      expect(addTool).toBeDefined();
+    });
+  });
+});
diff --git a/packages/toolpack-sdk/tests/unit/client.test.ts b/packages/toolpack-sdk/tests/unit/client.test.ts
index c1bee44..f919010 100644
--- a/packages/toolpack-sdk/tests/unit/client.test.ts
+++ b/packages/toolpack-sdk/tests/unit/client.test.ts
@@ -1,24 +1,41 @@
 import { describe, it, expect, vi } from 'vitest';
 import { AIClient } from '../../src/client';
 import { ProviderAdapter, CompletionRequest, CompletionResponse, CompletionChunk, EmbeddingRequest, EmbeddingResponse } from '../../src/providers/base';
+import { ToolRegistry } from '../../src/tools/registry';
+import { ToolDefinition, DEFAULT_TOOL_SEARCH_CONFIG, DEFAULT_TOOLS_CONFIG } from '../../src/tools/types';
 
 // A simple mock provider that just returns the received request so we can inspect it
-class MockProvider implements ProviderAdapter {
+class MockProvider extends ProviderAdapter {
     async generate(request: CompletionRequest): Promise<CompletionResponse> {
         // Return the request serialized in the content so we can inspect it
         return {
             content: JSON.stringify(request),
         };
     }
+
     async *stream(request: CompletionRequest): AsyncGenerator<CompletionChunk> {
         yield { delta: JSON.stringify(request) };
-        yield { finish_reason: 'stop' };
+        yield { delta: '', finish_reason: 'stop' };
     }
     async embed(request: EmbeddingRequest): Promise<EmbeddingResponse> {
         return { embeddings: [] };
     }
 }
 
+function makeTestTool(name: string, category: string, description: string): ToolDefinition {
+    return {
+        name,
+        displayName: name,
+        description,
+        category,
+        parameters: {
+            type: 'object',
+            properties: {},
+        },
+        execute: async () => '',
+    };
+}
+
 describe('AIClient - System Prompt Injection', () => {
     it('should inject Base Agent Context by default', async () => {
         const client = new AIClient({
@@ -130,8 +147,14 @@ describe('AIClient - System Prompt Injection', () => {
         client.setMode({
             name: 'no-context',
             displayName: 'Test',
+            description: 'Test mode',
             systemPrompt: 'Only me.',
             baseContext: false,
+            allowedTools: [],
+            blockedTools: [],
+            allowedToolCategories: [],
+            blockedToolCategories: [],
+            blockAllTools: false,
         });
 
         const response = await client.generate({
@@ -156,8 +179,14 @@ describe('AIClient - System Prompt Injection', () => {
         client.setMode({
             name: 'no-wd',
             displayName: 'Test',
+            description: 'Test mode',
             systemPrompt: 'Hello.',
             baseContext: { includeWorkingDirectory: false, includeToolCategories: true },
+            allowedTools: [],
+            blockedTools: [],
+            allowedToolCategories: [],
+            blockedToolCategories: [],
+            blockAllTools: false,
         });
 
         const response = await client.generate({
@@ -181,8 +210,14 @@ describe('AIClient - System Prompt Injection', () => {
         client.setMode({
             name: 'custom-ctx',
             displayName: 'Test',
+            description: 'Test mode',
             systemPrompt: 'Hello.',
             baseContext: { custom: 'Custom built base context entirely.' },
+            allowedTools: [],
+            blockedTools: [],
+            allowedToolCategories: [],
+            blockedToolCategories: [],
+            blockAllTools: false,
         });
 
         const response = await client.generate({
@@ -197,4 +232,188 @@ describe('AIClient - System Prompt Injection', () => {
         expect(systemMessage.content).toContain('Custom built base context entirely.');
         expect(systemMessage.content).toContain('Hello.');
     });
+
+    it('should inject request-tool guidance and strip requestTools from provider payload', async () => {
+        const client = new AIClient({
+            providers: { mock: new MockProvider() },
+            defaultProvider: 'mock',
+            disableBaseContext: true,
+        });
+
+        const response = await client.generate({
+            messages: [{ role: 'user', content: 'test' }],
+            model: 'test-model',
+            requestTools: [
+                {
+                    name: 'knowledge_search',
+                    displayName: 'Knowledge Search',
+                    description: 'Search the knowledge base',
+                    category: 'search',
+                    parameters: {
+                        type: 'object',
+                        properties: { query: { type: 'string' } },
+                        required: ['query'],
+                    },
+                    execute: vi.fn(),
+                },
+                {
+                    name: 'conversation_search',
+                    displayName: 'Conversation Search',
+                    description: 'Search earlier conversation',
+                    category: 'search',
+                    parameters: {
+                        type: 'object',
+                        properties: { query: { type: 'string' } },
+                        required: ['query'],
+                    },
+                    execute: vi.fn(),
+                },
+            ],
+        });
+
+        const request = JSON.parse(response.content || '{}');
+        const systemMessage = request.messages.find((m: any) => m.role === 'system');
+
+        expect(systemMessage).toBeDefined();
+        expect(systemMessage.content).toContain('knowledge_search');
+        expect(systemMessage.content).toContain('conversation_search');
+        expect(request.requestTools).toBeUndefined();
+        expect(request.tools).toHaveLength(2);
+    });
+
+    it('should not duplicate guidance when marker is already present', async () => {
+        const client = new AIClient({
+            providers: { mock: new MockProvider() },
+            defaultProvider: 'mock',
+        });
+
+        const response = await client.generate({
+            messages: [
+                { 
+                    role: 'system', 
+                    content: 'Existing prompt.\n\n<!-- TOOLPACK_REQUEST_TOOL_GUIDANCE -->\nKnowledge Base:\n- Use `knowledge_search` when you need factual or domain-specific information that may already be stored.'
+                },
+                { role: 'user', content: 'test' }
+            ],
+            model: 'test-model',
+            requestTools: [
+                {
+                    name: 'knowledge_search',
+                    displayName: 'Knowledge Search',
+                    description: 'Search knowledge',
+                    category: 'search',
+                    parameters: {
+                        type: 'object',
+                        properties: {
+                            query: { type: 'string', description: 'Search query' },
+                        },
+                        required: ['query'],
+                    },
+                    execute: async () => ({}),
+                },
+            ],
+        });
+
+        const request = JSON.parse(response.content || '{}');
+        const systemMessage = request.messages.find((m: any) => m.role === 'system');
+
+        expect(systemMessage).toBeDefined();
+        
+        // Count occurrences of the marker - should only appear once
+        const markerCount = (systemMessage.content.match(/<!-- TOOLPACK_REQUEST_TOOL_GUIDANCE -->/g) || []).length;
+        expect(markerCount).toBe(1);
+        
+        // Count occurrences of "Knowledge Base:" - should only appear once
+        const knowledgeBaseCount = (systemMessage.content.match(/Knowledge Base:/g) || []).length;
+        expect(knowledgeBaseCount).toBe(1);
+    });
+
+    it('should keep tool.search available when mode restricts allowedToolCategories', async () => {
+        const registry = new ToolRegistry();
+        registry.register(makeTestTool('web.search', 'network', 'Search the web for current information'));
+        registry.register(makeTestTool('fs.read_file', 'filesystem', 'Read local files'));
+
+        const client = new AIClient({
+            providers: { mock: new MockProvider() },
+            defaultProvider: 'mock',
+            disableBaseContext: true,
+            toolRegistry: registry,
+            toolsConfig: {
+                ...DEFAULT_TOOLS_CONFIG,
+                toolSearch: {
+                    ...DEFAULT_TOOL_SEARCH_CONFIG,
+                    enabled: true,
+                    alwaysLoadedTools: [],
+                    alwaysLoadedCategories: [],
+                },
+            },
+        });
+
+        client.setMode({
+            name: 'network-only',
+            displayName: 'Network Only',
+            description: 'Only network tools should be callable',
+            systemPrompt: 'Use tools when needed.',
+            allowedTools: [],
+            blockedTools: [],
+            allowedToolCategories: ['network'],
+            blockedToolCategories: [],
+            blockAllTools: false,
+            toolSearch: { enabled: true },
+        });
+
+        const response = await client.generate({
+            messages: [{ role: 'user', content: 'What is the news today?' }],
+            model: 'test-model',
+        });
+
+        const request = JSON.parse(response.content || '{}');
+        const toolNames = (request.tools || []).map((tool: any) => tool.function.name);
+
+        expect(toolNames).toContain('tool.search');
+    });
+
+    it('should make tool.search results respect mode allowed categories', () => {
+        const registry = new ToolRegistry();
+        registry.register(makeTestTool('web.search', 'network', 'Search the web for headlines and current news'));
+        registry.register(makeTestTool('fs.read_file', 'filesystem', 'Read files from disk and local folders'));
+
+        const client = new AIClient({
+            providers: { mock: new MockProvider() },
+            defaultProvider: 'mock',
+            disableBaseContext: true,
+            toolRegistry: registry,
+            toolsConfig: {
+                ...DEFAULT_TOOLS_CONFIG,
+                toolSearch: {
+                    ...DEFAULT_TOOL_SEARCH_CONFIG,
+                    enabled: true,
+                    alwaysLoadedTools: [],
+                    alwaysLoadedCategories: [],
+                },
+            },
+        });
+
+        client.setMode({
+            name: 'network-only',
+            displayName: 'Network Only',
+            description: 'Only network tools should be searchable',
+            systemPrompt: 'Use tools when needed.',
+            allowedTools: [],
+            blockedTools: [],
+            allowedToolCategories: ['network'],
+            blockedToolCategories: [],
+            blockAllTools: false,
+            toolSearch: { enabled: true },
+        });
+
+        const raw = (client as any).executeToolSearch({ query: 'search files and news' });
+        const parsed = JSON.parse(raw);
+        const resultNames = parsed.tools.map((tool: any) => tool.name);
+        const resultCategories = parsed.tools.map((tool: any) => tool.category);
+
+        expect(resultNames).toContain('web.search');
+        expect(resultNames).not.toContain('fs.read_file');
+        expect(resultCategories.every((category: string) => category === 'network')).toBe(true);
+    });
 });
diff --git a/packages/toolpack-sdk/tests/unit/openrouter-adapter.test.ts b/packages/toolpack-sdk/tests/unit/openrouter-adapter.test.ts
new file mode 100644
index 0000000..a268fec
--- /dev/null
+++ b/packages/toolpack-sdk/tests/unit/openrouter-adapter.test.ts
@@ -0,0 +1,230 @@
+import { describe, it, expect, vi, beforeEach } from 'vitest';
+
+describe('OpenRouterAdapter', () => {
+    let OpenRouterAdapter: any;
+    let mockCreate: any;
+
+    beforeEach(async () => {
+        vi.resetModules();
+
+        mockCreate = vi.fn();
+        vi.doMock('openai', () => {
+            class MockOpenAI {
+                chat = { completions: { create: mockCreate } };
+                embeddings = { create: vi.fn().mockResolvedValue({ data: [{ embedding: [0.1, 0.2] }], usage: { prompt_tokens: 5, total_tokens: 5 } }) };
+                static APIError = class APIError extends Error {
+                    status: number;
+                    constructor(status: number, message: string) {
+                        super(message);
+                        this.status = status;
+                    }
+                };
+            }
+            return { default: MockOpenAI };
+        });
+
+        vi.doMock('../../src/providers/provider-logger', () => ({
+            log: vi.fn(),
+            logError: vi.fn(),
+            logWarn: vi.fn(),
+            logInfo: vi.fn(),
+            logDebug: vi.fn(),
+            logTrace: vi.fn(),
+            safePreview: vi.fn((v: any) => String(v).slice(0, 50)),
+            logMessagePreview: vi.fn(),
+            isVerbose: vi.fn(() => false),
+            shouldLog: vi.fn(() => true),
+            getLogLevel: vi.fn(() => 3),
+        }));
+
+        const mod = await import('../../src/providers/openrouter/index');
+        OpenRouterAdapter = mod.OpenRouterAdapter;
+    });
+
+    describe('identity', () => {
+        it('should have name = openrouter', () => {
+            const adapter = new OpenRouterAdapter('test-key');
+            expect(adapter.name).toBe('openrouter');
+        });
+
+        it('should have display name OpenRouter', () => {
+            const adapter = new OpenRouterAdapter('test-key');
+            expect(adapter.getDisplayName()).toBe('OpenRouter');
+        });
+
+        it('supportsFileUpload() should be false', () => {
+            const adapter = new OpenRouterAdapter('test-key');
+            expect(adapter.supportsFileUpload()).toBe(false);
+        });
+    });
+
+    describe('generate()', () => {
+        it('should convert response to CompletionResponse format', async () => {
+            mockCreate.mockResolvedValue({
+                choices: [{
+                    message: { content: 'Hello from OpenRouter!', tool_calls: null },
+                    finish_reason: 'stop',
+                }],
+                usage: { prompt_tokens: 10, completion_tokens: 5, total_tokens: 15 },
+            });
+
+            const adapter = new OpenRouterAdapter('test-key');
+            const response = await adapter.generate({
+                messages: [{ role: 'user', content: 'Hi' }],
+                model: 'anthropic/claude-sonnet-4-6',
+            });
+
+            expect(response.content).toBe('Hello from OpenRouter!');
+            expect(response.finish_reason).toBe('stop');
+            expect(response.usage?.total_tokens).toBe(15);
+        });
+
+        it('should handle tool calls in response', async () => {
+            mockCreate.mockResolvedValue({
+                choices: [{
+                    message: {
+                        content: null,
+                        tool_calls: [{
+                            id: 'call_abc',
+                            function: { name: 'fs_read_file', arguments: '{"path":"/test.txt"}' },
+                        }],
+                    },
+                    finish_reason: 'tool_calls',
+                }],
+                usage: { prompt_tokens: 20, completion_tokens: 10, total_tokens: 30 },
+            });
+
+            const adapter = new OpenRouterAdapter('test-key');
+            const response = await adapter.generate({
+                messages: [{ role: 'user', content: 'Read test.txt' }],
+                model: 'openai/gpt-4.1',
+                tools: [{
+                    type: 'function',
+                    function: { name: 'fs.read_file', description: 'Read a file', parameters: { type: 'object', properties: { path: { type: 'string' } } } },
+                }],
+            });
+
+            expect(response.tool_calls).toHaveLength(1);
+            expect(response.tool_calls![0].id).toBe('call_abc');
+            expect(response.tool_calls![0].name).toBe('fs.read_file');
+            expect(response.tool_calls![0].arguments).toEqual({ path: '/test.txt' });
+        });
+    });
+
+    describe('stream()', () => {
+        it('should yield text deltas', async () => {
+            const chunks = [
+                { choices: [{ delta: { content: 'Hello ' }, finish_reason: null }], usage: null },
+                { choices: [{ delta: { content: 'world' }, finish_reason: null }], usage: null },
+                { choices: [{ delta: {}, finish_reason: 'stop' }], usage: { prompt_tokens: 5, completion_tokens: 2, total_tokens: 7 } },
+            ];
+
+            mockCreate.mockResolvedValue({
+                [Symbol.asyncIterator]: async function* () {
+                    for (const c of chunks) yield c;
+                },
+            });
+
+            const adapter = new OpenRouterAdapter('test-key');
+            const results: any[] = [];
+            for await (const chunk of adapter.stream({
+                messages: [{ role: 'user', content: 'Hi' }],
+                model: 'meta-llama/llama-3.3-70b-instruct',
+            })) {
+                results.push(chunk);
+            }
+
+            const text = results.filter(c => c.delta).map(c => c.delta).join('');
+            expect(text).toBe('Hello world');
+
+            const stopChunk = results.find(c => c.finish_reason === 'stop');
+            expect(stopChunk).toBeDefined();
+        });
+    });
+
+    describe('getModels()', () => {
+        it('should fetch and map models from OpenRouter API', async () => {
+            const mockModels = {
+                data: [
+                    {
+                        id: 'anthropic/claude-sonnet-4-6',
+                        name: 'Claude Sonnet 4.6',
+                        context_length: 200000,
+                        architecture: { modality: 'text+image->text' },
+                        pricing: { prompt: '0.000003' },
+                        top_provider: { max_completion_tokens: 8192 },
+                    },
+                    {
+                        id: 'meta-llama/llama-3.3-70b-instruct',
+                        name: 'Llama 3.3 70B Instruct',
+                        context_length: 131072,
+                        architecture: { modality: 'text->text' },
+                        pricing: { prompt: '0.00000059' },
+                        top_provider: { max_completion_tokens: 32768 },
+                    },
+                ],
+            };
+
+            global.fetch = vi.fn().mockResolvedValue({
+                ok: true,
+                json: async () => mockModels,
+            });
+
+            const adapter = new OpenRouterAdapter('test-key');
+            const models = await adapter.getModels();
+
+            expect(models).toHaveLength(2);
+
+            const claude = models.find(m => m.id === 'anthropic/claude-sonnet-4-6')!;
+            expect(claude.displayName).toBe('Claude Sonnet 4.6');
+            expect(claude.capabilities.vision).toBe(true);
+            expect(claude.contextWindow).toBe(200000);
+            expect(claude.costTier).toBe('medium'); // $3/1M
+
+            const llama = models.find(m => m.id === 'meta-llama/llama-3.3-70b-instruct')!;
+            expect(llama.capabilities.vision).toBe(false);
+            expect(llama.costTier).toBe('low');
+        });
+
+        it('should return empty array when fetch fails', async () => {
+            global.fetch = vi.fn().mockRejectedValue(new Error('network error'));
+
+            const adapter = new OpenRouterAdapter('test-key');
+            const models = await adapter.getModels();
+            expect(models).toEqual([]);
+        });
+
+        it('should return empty array on non-ok response', async () => {
+            global.fetch = vi.fn().mockResolvedValue({ ok: false });
+
+            const adapter = new OpenRouterAdapter('test-key');
+            const models = await adapter.getModels();
+            expect(models).toEqual([]);
+        });
+    });
+
+    describe('deriveCostTier (via getModels)', () => {
+        it.each([
+            ['0.0000001', 'low'],      // $0.10 / 1M
+            ['0.0000009', 'low'],      // $0.90 / 1M — just under $1 threshold
+            ['0.000001', 'medium'],    // $1.00 / 1M — hits medium tier
+            ['0.000003', 'medium'],    // $3.00 / 1M
+            ['0.000004', 'medium'],    // $4.00 / 1M — just under $5 threshold
+            ['0.000005', 'high'],      // $5.00 / 1M — hits high tier
+            ['0.000015', 'high'],      // $15.00 / 1M
+            ['0.00002', 'premium'],    // $20.00 / 1M — hits premium tier
+            ['0.0001', 'premium'],     // $100.00 / 1M
+        ])('pricing.prompt=%s → costTier=%s', async (prompt, expectedTier) => {
+            global.fetch = vi.fn().mockResolvedValue({
+                ok: true,
+                json: async () => ({
+                    data: [{ id: 'test/model', name: 'Test', context_length: 4096, architecture: { modality: 'text->text' }, pricing: { prompt } }],
+                }),
+            });
+
+            const adapter = new OpenRouterAdapter('test-key');
+            const [model] = await adapter.getModels();
+            expect(model.costTier).toBe(expectedTier);
+        });
+    });
+});
diff --git a/scripts/README.md b/scripts/README.md
new file mode 100644
index 0000000..6ab57ca
--- /dev/null
+++ b/scripts/README.md
@@ -0,0 +1,278 @@
+# Version Update Script
+
+## Overview
+
+The `update-version.js` script updates versions across all Toolpack packages and their peer dependencies in a single command.
+
+## What It Updates
+
+### 1. Package Versions
+- `packages/toolpack-sdk/package.json`
+- `packages/toolpack-knowledge/package.json`
+- `packages/toolpack-agents/package.json`
+- `samples/toolpack-cli/package.json`
+
+### 2. Peer Dependencies
+- `@toolpack-sdk/agents` peer dependencies:
+  - `toolpack-sdk` → `^{version}`
+  - `@toolpack-sdk/knowledge` → `^{version}`
+
+### 3. Display Versions
+- `samples/toolpack-cli/source/components/AppInfo.tsx`
+
+## Usage
+
+```bash
+# Basic usage
+node scripts/update-version.js <version>
+
+# Examples
+node scripts/update-version.js 1.4.0
+node scripts/update-version.js 2.0.0-beta.1
+node scripts/update-version.js 1.3.1-SNAPSHOT.13042026
+
+# Via npm script
+npm run version 1.4.0
+```
+
+## Version Format
+
+The script validates version format using semantic versioning:
+
+```
+X.Y.Z               # Standard release (e.g., 1.4.0)
+X.Y.Z-suffix        # Pre-release (e.g., 2.0.0-beta.1)
+X.Y.Z-SNAPSHOT.date # Snapshot (e.g., 1.4.0-SNAPSHOT.13042026)
+```
+
+## Output Example
+
+```bash
+$ node scripts/update-version.js 1.4.0
+
+🔄 Updating version to 1.4.0...
+
+📦 Step 1: Updating package versions
+
+✅ toolpack-sdk
+   1.3.0 → 1.4.0
+✅ @toolpack-sdk/knowledge
+   1.3.0 → 1.4.0
+✅ @toolpack-sdk/agents
+   1.3.0 → 1.4.0
+✅ toolpack-cli
+   1.3.0 → 1.4.0
+✅ AppInfo.tsx
+   const version = 'v1.3.0'; → const version = 'v1.4.0';
+
+✨ Updated 5/5 package versions
+
+📦 Step 2: Updating peer dependencies
+
+✅ @toolpack-sdk/agents peer dependencies:
+   toolpack-sdk: ^1.3.0 → ^1.4.0
+   @toolpack-sdk/knowledge: ^1.3.0 → ^1.4.0
+
+✨ Version update complete!
+
+💡 Next steps:
+   1. Review changes: git diff
+   2. Build packages: npm run build
+   3. Run tests: npm test
+   4. Commit: git commit -am "chore: bump version to 1.4.0"
+   5. Tag: git tag v1.4.0
+   6. Push: git push && git push --tags
+```
+
+## What Gets Updated
+
+### Before
+```json
+// packages/toolpack-sdk/package.json
+{
+  "name": "toolpack-sdk",
+  "version": "1.3.0"
+}
+
+// packages/toolpack-knowledge/package.json
+{
+  "name": "@toolpack-sdk/knowledge",
+  "version": "1.3.0"
+}
+
+// packages/toolpack-agents/package.json
+{
+  "name": "@toolpack-sdk/agents",
+  "version": "1.3.0",
+  "peerDependencies": {
+    "toolpack-sdk": "^1.3.0",
+    "@toolpack-sdk/knowledge": "^1.3.0"
+  }
+}
+```
+
+### After (running `node scripts/update-version.js 1.4.0`)
+```json
+// packages/toolpack-sdk/package.json
+{
+  "name": "toolpack-sdk",
+  "version": "1.4.0"
+}
+
+// packages/toolpack-knowledge/package.json
+{
+  "name": "@toolpack-sdk/knowledge",
+  "version": "1.4.0"
+}
+
+// packages/toolpack-agents/package.json
+{
+  "name": "@toolpack-sdk/agents",
+  "version": "1.4.0",
+  "peerDependencies": {
+    "toolpack-sdk": "^1.4.0",
+    "@toolpack-sdk/knowledge": "^1.4.0"
+  }
+}
+```
+
+## Error Handling
+
+### Missing Version Argument
+```bash
+$ node scripts/update-version.js
+
+❌ Error: Version argument required
+
+Usage:
+  node scripts/update-version.js <version>
+```
+
+### Invalid Version Format
+```bash
+$ node scripts/update-version.js 1.4
+
+❌ Error: Invalid version format: 1.4
+   Expected format: X.Y.Z or X.Y.Z-suffix
+```
+
+### File Not Found
+```bash
+❌ Failed to update packages/toolpack-sdk/package.json: ENOENT: no such file or directory
+```
+
+## Integration with npm
+
+Add to `package.json`:
+
+```json
+{
+  "scripts": {
+    "version": "node scripts/update-version.js"
+  }
+}
+```
+
+Then use:
+
+```bash
+npm run version 1.4.0
+```
+
+## Best Practices
+
+### 1. Always Review Changes
+```bash
+git diff
+```
+
+### 2. Build and Test Before Committing
+```bash
+npm run build
+npm test
+```
+
+### 3. Use Consistent Version Numbers
+- All packages use the same version
+- Peer dependencies use `^` (caret) for compatibility
+
+### 4. Follow Semantic Versioning
+- **Patch** (1.3.1): Bug fixes
+- **Minor** (1.4.0): New features, backward compatible
+- **Major** (2.0.0): Breaking changes
+
+### 5. Tag Releases
+```bash
+git tag v1.4.0
+git push --tags
+```
+
+## Troubleshooting
+
+### Script Fails to Update File
+
+**Problem:** Permission denied or file not found
+
+**Solution:**
+```bash
+# Check file exists
+ls -la packages/toolpack-sdk/package.json
+
+# Check permissions
+chmod +x scripts/update-version.js
+```
+
+### Peer Dependencies Not Updated
+
+**Problem:** Agents package doesn't have peer dependencies
+
+**Solution:**
+- Check `packages/toolpack-agents/package.json` has `peerDependencies` field
+- Script only updates existing peer dependencies
+
+### Version Mismatch After Update
+
+**Problem:** Some files show old version
+
+**Solution:**
+```bash
+# Re-run the script
+node scripts/update-version.js 1.4.0
+
+# Check all files
+git diff
+```
+
+## Future Enhancements
+
+Potential improvements:
+
+1. **Dry Run Mode**
+   ```bash
+   node scripts/update-version.js 1.4.0 --dry-run
+   ```
+
+2. **Selective Updates**
+   ```bash
+   node scripts/update-version.js 1.4.0 --only=sdk,agents
+   ```
+
+3. **Automatic Git Operations**
+   ```bash
+   node scripts/update-version.js 1.4.0 --commit --tag
+   ```
+
+4. **Changelog Generation**
+   - Auto-generate CHANGELOG.md entries
+   - Pull from git commits since last tag
+
+5. **Pre-release Versions**
+   - Auto-increment pre-release numbers
+   - `1.4.0-beta.1` → `1.4.0-beta.2`
+
+## Related Scripts
+
+- `npm run build` — Build all packages
+- `npm test` — Run all tests
+- `npm run lint` — Lint all packages
+- `npm run publish` — Publish to npm (future)
diff --git a/scripts/update-version.js b/scripts/update-version.js
index 52220bb..3d43ffb 100755
--- a/scripts/update-version.js
+++ b/scripts/update-version.js
@@ -1,11 +1,16 @@
 #!/usr/bin/env node
 /**
- * Update version across all Toolpack packages
+ * Update version across all Toolpack packages and their peer dependencies
  * 
  * Usage:
- *   node scripts/update-version.js
- *   node scripts/update-version.js
+ *   node scripts/update-version.js <version>
  *   npm run version 1.3.0
+ * 
+ * This script:
+ * - Updates version in SDK, Knowledge, and Agents packages
+ * - Updates peer dependency versions in Agents package
+ * - Updates CLI sample version
+ * - Updates AppInfo.tsx version display
  */
 
 import fs from 'fs';
@@ -15,25 +20,41 @@ import { fileURLToPath } from 'url';
 const __dirname = path.dirname(fileURLToPath(import.meta.url));
 const rootDir = path.join(__dirname, '..');
 
+// Package paths
+const PACKAGES = {
+  sdk: 'packages/toolpack-sdk/package.json',
+  knowledge: 'packages/toolpack-knowledge/package.json',
+  agents: 'packages/toolpack-agents/package.json',
+};
+
 // Files to update
 const FILES_TO_UPDATE = [
   {
-    path: 'packages/toolpack-sdk/package.json',
+    path: PACKAGES.sdk,
+    field: 'version',
+    name: 'toolpack-sdk',
+  },
+  {
+    path: PACKAGES.knowledge,
     field: 'version',
+    name: '@toolpack-sdk/knowledge',
   },
   {
-    path: 'packages/toolpack-knowledge/package.json',
+    path: PACKAGES.agents,
     field: 'version',
+    name: '@toolpack-sdk/agents',
   },
   {
     path: 'samples/toolpack-cli/package.json',
     field: 'version',
+    name: 'toolpack-cli',
   },
   {
     path: 'samples/toolpack-cli/source/components/AppInfo.tsx',
     type: 'typescript',
     pattern: /const version = 'v[\d\.\-A-Z]+';/,
     replacement: (version) => `const version = 'v${version}';`,
+    name: 'AppInfo.tsx',
   },
 ];
 
@@ -46,6 +67,37 @@ function updatePackageJson(filePath, version) {
   return oldVersion;
 }
 
+function updatePeerDependencies(filePath, versions) {
+  const fullPath = path.join(rootDir, filePath);
+  const content = JSON.parse(fs.readFileSync(fullPath, 'utf8'));
+  
+  if (!content.peerDependencies) {
+    return null;
+  }
+  
+  const updates = [];
+  
+  // Update toolpack-sdk peer dependency
+  if (content.peerDependencies['toolpack-sdk'] && versions.sdk) {
+    const oldVersion = content.peerDependencies['toolpack-sdk'];
+    content.peerDependencies['toolpack-sdk'] = `^${versions.sdk}`;
+    updates.push({ package: 'toolpack-sdk', old: oldVersion, new: `^${versions.sdk}` });
+  }
+  
+  // Update @toolpack-sdk/knowledge peer dependency
+  if (content.peerDependencies['@toolpack-sdk/knowledge'] && versions.knowledge) {
+    const oldVersion = content.peerDependencies['@toolpack-sdk/knowledge'];
+    content.peerDependencies['@toolpack-sdk/knowledge'] = `^${versions.knowledge}`;
+    updates.push({ package: '@toolpack-sdk/knowledge', old: oldVersion, new: `^${versions.knowledge}` });
+  }
+  
+  if (updates.length > 0) {
+    fs.writeFileSync(fullPath, JSON.stringify(content, null, 2) + '\n');
+  }
+  
+  return updates;
+}
+
 function updateTypeScriptFile(filePath, pattern, replacement, version) {
   const fullPath = path.join(rootDir, filePath);
   let content = fs.readFileSync(fullPath, 'utf8');
@@ -79,9 +131,16 @@ function main() {
   }
 
   console.log(`🔄 Updating version to ${newVersion}...\n`);
+  console.log('📦 Step 1: Updating package versions\n');
 
   let updatedCount = 0;
+  const versions = {
+    sdk: newVersion,
+    knowledge: newVersion,
+    agents: newVersion,
+  };
 
+  // Update all package versions
   for (const file of FILES_TO_UPDATE) {
     try {
       let oldVersion;
@@ -97,7 +156,7 @@ function main() {
         oldVersion = updatePackageJson(file.path, newVersion);
       }
 
-      console.log(`✅ ${file.path}`);
+      console.log(`✅ ${file.name || file.path}`);
       console.log(`   ${oldVersion} → ${newVersion}`);
       updatedCount++;
     } catch (error) {
@@ -105,11 +164,34 @@ function main() {
     }
   }
 
-  console.log(`\n✨ Updated ${updatedCount}/${FILES_TO_UPDATE.length} files`);
+  console.log(`\n✨ Updated ${updatedCount}/${FILES_TO_UPDATE.length} package versions`);
+
+  // Update peer dependencies in agents package
+  console.log(`\n📦 Step 2: Updating peer dependencies\n`);
+  
+  try {
+    const peerUpdates = updatePeerDependencies(PACKAGES.agents, versions);
+    
+    if (peerUpdates && peerUpdates.length > 0) {
+      console.log(`✅ @toolpack-sdk/agents peer dependencies:`);
+      for (const update of peerUpdates) {
+        console.log(`   ${update.package}: ${update.old} → ${update.new}`);
+      }
+    } else {
+      console.log(`ℹ️  No peer dependencies to update`);
+    }
+  } catch (error) {
+    console.error(`❌ Failed to update peer dependencies:`, error.message);
+  }
+
+  console.log(`\n✨ Version update complete!`);
   console.log(`\n💡 Next steps:`);
   console.log(`   1. Review changes: git diff`);
   console.log(`   2. Build packages: npm run build`);
-  console.log(`   3. Commit: git commit -am "chore: bump version to ${newVersion}"`);
+  console.log(`   3. Run tests: npm test`);
+  console.log(`   4. Commit: git commit -am "chore: bump version to ${newVersion}"`);
+  console.log(`   5. Tag: git tag v${newVersion}`);
+  console.log(`   6. Push: git push && git push --tags`);
 }
 
 main();