porting agent to TS

.gitignore

@@ -46,4 +46,5 @@ playground
 
 # Temporary directories from sync workflows
 extension-temp/
-
+playground
+.env

package.json

@@ -48,6 +48,7 @@
     "@types/uuid": "^9.0.0",
     "@typescript-eslint/eslint-plugin": "^8.51.0",
     "@typescript-eslint/parser": "^8.51.0",
+    "dotenv": "^17.4.2",
     "eslint": "^9.39.2",
     "eslint-config-prettier": "^10.1.8",
     "eslint-plugin-prettier": "^5.5.4",

src/agents/planner-executor/DEFERRED_FEATURES.md

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+# PlannerExecutorAgent: Deferred Features
+
+**Date:** 2026-04-13
+**Status:** Documentation for post-MVP implementation
+
+## Overview
+
+This document outlines features from the Python `PlannerExecutorAgent` that were deferred from the TypeScript MVP port. These features add reliability and flexibility but are not required for basic browser automation tasks.
+
+## MVP Implementation Summary
+
+The TypeScript MVP includes:
+
+1. **Core Agent (~600 lines)**
+   - Stepwise (ReAct-style) planning loop
+   - Action parsing (CLICK, TYPE, SCROLL, PRESS, DONE)
+   - Compact context formatting for small models
+   - Token usage tracking by role and model
+
+2. **Reliability Features (~200 lines)**
+   - Snapshot escalation (progressive limit increase)
+   - Pre-action authorization hook (for sidecar policy)
+   - Basic error handling and retry
+
+3. **Configuration (~250 lines)**
+   - `PlannerExecutorConfig` with presets
+   - `SnapshotEscalationConfig`, `RetryConfig`, `StepwisePlanningConfig`
+   - Factory helpers for provider creation
+
+## Deferred Features
+
+### 1. Modal/Overlay Dismissal
+
+**Python Reference:** `ModalDismissalConfig`, `_attempt_modal_dismissal()`
+
+**Description:** Automatically dismiss blocking overlays after DOM changes:
+
+- Product protection/warranty upsells
+- Cookie consent banners
+- Newsletter signup popups
+- Promotional overlays
+- Cart upsell drawers
+
+**Implementation Effort:** ~150 lines
+
+**Config Interface:**
+
+```typescript
+interface ModalDismissalConfig {
+  enabled: boolean;
+  dismissPatterns: string[]; // e.g., ['close', 'no thanks', 'skip']
+  dismissIcons: string[]; // e.g., ['×', '✕', 'x']
+  roleFilter: string[]; // e.g., ['button', 'link']
+  maxAttempts: number;
+  minNewElements: number; // Minimum DOM changes to trigger
+}
+```
+
+**Key Logic:**
+
+- Detect DOM changes after CLICK actions
+- Find buttons matching dismissal patterns (word-boundary matching)
+- Click dismissal button and verify modal closed
+- Skip if checkout-related buttons are present
+
+---
+
+### 2. Captcha Handling
+
+**Python Reference:** `CaptchaConfig`, `_detect_captcha()`, `_handle_captcha()`
+
+**Description:** Detect and handle CAPTCHAs during automation:
+
+- Policy options: `abort`, `callback`, `pause`
+- Support for external solving services
+- Detection via element text and patterns
+
+**Implementation Effort:** ~100 lines
+
+**Config Interface:**
+
+```typescript
+interface CaptchaConfig {
+  enabled: boolean;
+  policy: 'abort' | 'callback' | 'pause';
+  detectionPatterns: string[];
+  solverCallback?: (imageBase64: string) => Promise<string>;
+  maxWaitMs: number;
+}
+```
+
+**Key Logic:**
+
+- Check snapshot elements for CAPTCHA indicators
+- Based on policy: abort task, call external solver, or pause for human
+- Resume automation after CAPTCHA solved
+
+---
+
+### 3. Vision Fallback
+
+**Python Reference:** `VisionFallbackConfig`, vision_executor, vision_verifier
+
+**Description:** Use vision-capable models when DOM-based automation fails:
+
+- Canvas pages with no accessible elements
+- Low element confidence scores
+- Complex visual layouts
+
+**Implementation Effort:** ~200 lines
+
+**Config Interface:**
+
+```typescript
+interface VisionFallbackConfig {
+  enabled: boolean;
+  maxVisionCalls: number;
+  triggerRequiresVision: boolean;
+  triggerCanvasOrLowActionables: boolean;
+  canvasDetectionThreshold: number;
+  lowActionablesThreshold: number;
+}
+```
+
+**Key Logic:**
+
+- Detect snapshot failures (low elements, canvas pages)
+- Switch to vision executor with screenshot input
+- Use vision verifier for state verification
+- Fall back gracefully to DOM mode when possible
+
+---
+
+### 4. Intent Heuristics
+
+**Python Reference:** `IntentHeuristics` protocol, `_try_intent_heuristics()`
+
+**Description:** Pluggable domain-specific element selection without LLM:
+
+- E-commerce: "Add to Cart", "Checkout" buttons
+- Authentication: login forms, password fields
+- Search: search boxes, result links
+
+**Implementation Effort:** ~100 lines
+
+**Interface:**
+
+```typescript
+interface IntentHeuristics {
+  findElementForIntent(
+    intent: string,
+    elements: SnapshotElement[],
+    url: string,
+    goal: string
+  ): number | null;
+
+  priorityOrder(): string[];
+}
+
+// Example implementation
+class EcommerceHeuristics implements IntentHeuristics {
+  findElementForIntent(intent, elements, url, goal) {
+    if (intent.toLowerCase().includes('add to cart')) {
+      const btn = elements.find(el => el.text?.toLowerCase().includes('add to cart'));
+      return btn?.id ?? null;
+    }
+    return null; // Fall back to LLM
+  }
+
+  priorityOrder() {
+    return ['add_to_cart', 'checkout', 'search'];
+  }
+}
+```
+
+**Key Logic:**
+
+- Check heuristics before calling executor LLM
+- Reduces token usage for common patterns
+- Improves reliability for known sites
+
+---
+
+### 5. Recovery Navigation
+
+**Python Reference:** `RecoveryNavigationConfig`, `_last_known_good_url`
+
+**Description:** Track and recover from off-track navigation:
+
+- Remember last URL where verification passed
+- Navigate back when subsequent steps fail
+- Detect when agent is lost
+
+**Implementation Effort:** ~80 lines
+
+**Config Interface:**
+
+```typescript
+interface RecoveryNavigationConfig {
+  enabled: boolean;
+  maxRecoveryAttempts: number;
+  trackSuccessfulUrls: boolean;
+}
+```
+
+**Key Logic:**
+
+- Store URL after successful verification
+- On repeated failures, navigate back to last good URL
+- Replan from recovered state
+
+---
+
+### 6. Checkout/Auth Boundary Detection
+
+**Python Reference:** `CheckoutDetectionConfig`, `AuthBoundaryConfig`
+
+**Description:** Detect when agent reaches boundaries that require human intervention:
+
+- Checkout pages requiring payment info
+- Login/signup pages requiring credentials
+- Age verification gates
+
+**Implementation Effort:** ~60 lines
+
+**Config Interface:**
+
+```typescript
+interface CheckoutDetectionConfig {
+  enabled: boolean;
+  urlPatterns: string[]; // e.g., ['/checkout', '/payment']
+  elementPatterns: string[]; // e.g., ['credit card', 'payment']
+  stopOnDetection: boolean;
+}
+
+interface AuthBoundaryConfig {
+  enabled: boolean;
+  urlPatterns: string[]; // e.g., ['/login', '/signin']
+  elementPatterns: string[]; // e.g., ['sign in', 'log in']
+  stopOnDetection: boolean;
+}
+```
+
+---
+
+### 7. Executor Override
+
+**Python Reference:** `ExecutorOverride` protocol
+
+**Description:** Validate or override executor's element choices before action:
+
+- Safety checks (block delete buttons)
+- Domain-specific corrections
+- Audit logging
+
+**Implementation Effort:** ~50 lines
+
+**Interface:**
+
+```typescript
+interface ExecutorOverride {
+  validateChoice(
+    elementId: number,
+    action: string,
+    elements: SnapshotElement[],
+    goal: string
+  ): {
+    valid: boolean;
+    overrideElementId?: number;
+    rejectionReason?: string;
+  };
+}
+```
+
+---
+
+### 8. Upfront Planning Mode
+
+**Python Reference:** `plan()`, `replan()` methods
+
+**Description:** Generate full execution plan upfront (alternative to stepwise):
+
+- Better for known workflows
+- Supports plan patching on failure
+- More efficient for simple tasks
+
+**Implementation Effort:** ~200 lines
+
+**Key Functions:**
+
+- `plan(task, startUrl)` - Generate full plan
+- `replan(task, failedStep, reason)` - Patch plan after failure
+- `run(runtime, task)` - Execute with upfront planning
+
+---
+
+### 9. Task Category Pruning
+
+**Python Reference:** `PruningTaskCategory`, `prune_with_recovery()`
+
+**Description:** Category-specific element filtering to reduce context size:
+
+- Shopping: prioritize product/cart elements
+- Search: prioritize search box/results
+- Auth: prioritize form fields
+
+**Implementation Effort:** ~150 lines
+
+**Categories:**
+
+- `shopping`, `checkout`, `search`, `auth`, `form_filling`, `extraction`, `navigation`
+
+---
+
+## Implementation Priority
+
+Recommended order based on impact and complexity:
+
+1. **Intent Heuristics** - High impact, low complexity, reduces token usage
+2. **Modal Dismissal** - Common pain point, medium complexity
+3. **Vision Fallback** - Required for canvas/complex pages
+4. **Captcha Handling** - Needed for production use
+5. **Recovery Navigation** - Improves reliability
+6. **Upfront Planning** - Alternative mode for simple tasks
+7. **Boundary Detection** - Nice to have for graceful stops
+8. **Executor Override** - Nice to have for safety
+9. **Task Category Pruning** - Optimization for large pages
+
+## References
+
+- Python implementation: `sdk-python/predicate/agents/planner_executor_agent.py`
+- Design doc: `docs/sdk-ts-doc/2026-03-28_planner_executor_agent_port.md`
+- Chrome extension feasibility: `docs/sdk-python-doc/2026-04-13_predicate_chrome_extension_agent_feasibility.md`