v3.1.3 - Version bump

lib/commands/index.ts

@@ -0,0 +1,11 @@
+export { handleContextCommand } from "./context"
+export { handleDecompressCommand } from "./decompress"
+export { handleHelpCommand } from "./help"
+export {
+    applyPendingManualTrigger,
+    handleManualToggleCommand,
+    handleManualTriggerCommand,
+} from "./manual"
+export { handleRecompressCommand } from "./recompress"
+export { handleStatsCommand } from "./stats"
+export { handleSweepCommand } from "./sweep"

lib/commands/manual.ts

@@ -13,6 +13,7 @@ import type { PluginConfig } from "../config"
 import { sendIgnoredMessage } from "../ui/notification"
 import { getCurrentParams } from "../strategies/utils"
 import { buildCompressedBlockGuidance } from "../messages/inject/utils"
+import { isIgnoredUserMessage } from "../messages/utils"
 
 const MANUAL_MODE_ON = "Manual mode is now ON. Use /dcp compress to trigger context tools manually."
 
@@ -86,3 +87,39 @@ export async function handleManualTriggerCommand(
 ): Promise<string | null> {
     return getTriggerPrompt(tool, ctx.state, ctx.config, userFocus)
 }
+
+export function applyPendingManualTrigger(
+    state: SessionState,
+    messages: WithParts[],
+    logger: Logger,
+): void {
+    const pending = state.pendingManualTrigger
+    if (!pending) {
+        return
+    }
+
+    if (!state.sessionId || pending.sessionId !== state.sessionId) {
+        state.pendingManualTrigger = null
+        return
+    }
+
+    for (let i = messages.length - 1; i >= 0; i--) {
+        const msg = messages[i]
+        if (msg.info.role !== "user" || isIgnoredUserMessage(msg)) {
+            continue
+        }
+
+        for (const part of msg.parts) {
+            if (part.type !== "text" || part.ignored || part.synthetic) {
+                continue
+            }
+
+            part.text = pending.prompt
+            state.pendingManualTrigger = null
+            logger.debug("Applied manual prompt", { sessionId: pending.sessionId })
+            return
+        }
+    }
+
+    state.pendingManualTrigger = null
+}

lib/hooks.ts

@@ -2,75 +2,41 @@ import type { SessionState, WithParts } from "./state"
 import type { Logger } from "./logger"
 import type { PluginConfig } from "./config"
 import { assignMessageRefs } from "./message-ids"
-import { buildPriorityMap } from "./messages/priority"
-import { syncToolCache } from "./state/tool-cache"
 import {
-    prune,
-    syncCompressionBlocks,
+    buildPriorityMap,
+    buildToolIdList,
     injectCompressNudges,
-    injectMessageIds,
     injectExtendedSubAgentResults,
+    injectMessageIds,
+    prune,
+    stripHallucinations,
+    stripHallucinationsFromString,
     stripStaleMetadata,
+    syncCompressionBlocks,
 } from "./messages"
+import { renderSystemPrompt, type PromptStore } from "./prompts"
 import {
-    buildToolIdList,
-    isIgnoredUserMessage,
-    stripHallucinations,
-    stripHallucinationsFromString,
-} from "./messages/utils"
-import { checkSession } from "./state"
-import { renderSystemPrompt } from "./prompts"
-import { handleStatsCommand } from "./commands/stats"
-import { handleContextCommand } from "./commands/context"
-import { handleHelpCommand } from "./commands/help"
-import { handleSweepCommand } from "./commands/sweep"
-import { handleManualToggleCommand, handleManualTriggerCommand } from "./commands/manual"
-import { handleDecompressCommand } from "./commands/decompress"
-import { handleRecompressCommand } from "./commands/recompress"
+    applyPendingManualTrigger,
+    handleContextCommand,
+    handleDecompressCommand,
+    handleHelpCommand,
+    handleManualToggleCommand,
+    handleManualTriggerCommand,
+    handleRecompressCommand,
+    handleStatsCommand,
+    handleSweepCommand,
+} from "./commands"
 import { type HostPermissionSnapshot } from "./host-permissions"
 import { compressPermission, syncCompressPermissionState } from "./shared-utils"
-import { ensureSessionInitialized } from "./state/state"
+import { checkSession, ensureSessionInitialized, syncToolCache } from "./state"
 import { cacheSystemPromptTokens } from "./ui/utils"
-import type { PromptStore } from "./prompts/store"
 
 const INTERNAL_AGENT_SIGNATURES = [
     "You are a title generator",
     "You are a helpful AI assistant tasked with summarizing conversations",
     "Summarize what was done in this conversation",
 ]
 
-function applyManualPrompt(state: SessionState, messages: WithParts[], logger: Logger): void {
-    const pending = state.pendingManualTrigger
-    if (!pending) {
-        return
-    }
-
-    if (!state.sessionId || pending.sessionId !== state.sessionId) {
-        state.pendingManualTrigger = null
-        return
-    }
-
-    for (let i = messages.length - 1; i >= 0; i--) {
-        const msg = messages[i]
-        if (msg.info.role !== "user" || isIgnoredUserMessage(msg)) {
-            continue
-        }
-
-        for (const part of msg.parts) {
-            if (part.type !== "text" || part.ignored || part.synthetic) {
-                continue
-            }
-
-            part.text = pending.prompt
-            state.pendingManualTrigger = null
-            logger.debug("Applied manual prompt", { sessionId: pending.sessionId })
-            return
-        }
-    }
-
-    state.pendingManualTrigger = null
-}
-
 export function createSystemPromptHandler(
     state: SessionState,
     logger: Logger,
@@ -162,7 +128,7 @@ export function createChatMessageTransformHandler(
             compressionPriorities,
         )
         injectMessageIds(state, config, output.messages, compressionPriorities)
-        applyManualPrompt(state, output.messages, logger)
+        applyPendingManualTrigger(state, output.messages, logger)
         stripStaleMetadata(output.messages)
 
         if (state.sessionId) {

lib/messages/index.ts

@@ -4,3 +4,5 @@ export { injectCompressNudges } from "./inject/inject"
 export { injectMessageIds } from "./inject/inject"
 export { injectExtendedSubAgentResults } from "./inject/subagent-results"
 export { stripStaleMetadata } from "./reasoning-strip"
+export { buildPriorityMap } from "./priority"
+export { buildToolIdList, stripHallucinations, stripHallucinationsFromString } from "./utils"

lib/messages/inject/inject.ts

@@ -186,6 +186,18 @@ export const injectMessageIds = (
             continue
         }
 
+        const hasContent = message.parts.some(
+            (p) =>
+                (p.type === "text" && typeof p.text === "string" && p.text.trim().length > 0) ||
+                (p.type === "tool" &&
+                    p.state?.status === "completed" &&
+                    typeof p.state.output === "string"),
+        )
+
+        if (!hasContent) {
+            continue
+        }
+
         let injected = false
         for (const part of message.parts) {
             if (part.type === "text") {
@@ -195,16 +207,14 @@ export const injectMessageIds = (
             }
         }
 
-        if (injected) {
-            continue
-        }
-
-        const syntheticPart = createSyntheticTextPart(message, tag)
-        const firstToolIndex = message.parts.findIndex((p) => p.type === "tool")
-        if (firstToolIndex === -1) {
-            message.parts.push(syntheticPart)
-        } else {
-            message.parts.splice(firstToolIndex, 0, syntheticPart)
+        if (!injected) {
+            const syntheticPart = createSyntheticTextPart(message, tag)
+            const firstToolIndex = message.parts.findIndex((p) => p.type === "tool")
+            if (firstToolIndex === -1) {
+                message.parts.push(syntheticPart)
+            } else {
+                message.parts.splice(firstToolIndex, 0, syntheticPart)
+            }
         }
     }
 }

lib/prompts/index.ts

@@ -1,4 +1,5 @@
 import type { RuntimePrompts } from "./store"
+export type { PromptStore, RuntimePrompts } from "./store"
 
 function stripLegacyInlineComments(content: string): string {
     return content.replace(/^[ \t]*\/\/.*?\/\/[ \t]*$/gm, "")

lib/state/index.ts

@@ -1,3 +1,4 @@
 export * from "./persistence"
 export * from "./types"
 export * from "./state"
+export * from "./tool-cache"

package.json

@@ -1,7 +1,7 @@
 {
     "$schema": "https://json.schemastore.org/package.json",
     "name": "@tarquinen/opencode-dcp",
-    "version": "3.1.2",
+    "version": "3.1.3",
     "type": "module",
     "description": "OpenCode plugin that optimizes token usage by pruning obsolete tool outputs from conversation context",
     "main": "./dist/index.js",

tests/message-priority.test.ts

@@ -670,3 +670,104 @@ test("hallucination stripping does not affect non-dcp tags", async () => {
         "<div>hello</div> <system-reminder>keep</system-reminder>",
     )
 })
+
+test("injectMessageIds skips empty assistant messages to avoid prefill (issue #463)", () => {
+    const sessionID = "ses_empty_assistant"
+    const messages: WithParts[] = [
+        buildMessage("msg-user-1", "user", sessionID, "Hello", 1),
+        {
+            info: {
+                id: "msg-assistant-empty",
+                role: "assistant",
+                sessionID,
+                agent: "assistant",
+                time: { created: 2 },
+            } as WithParts["info"],
+            parts: [],
+        },
+        buildMessage("msg-user-2", "user", sessionID, "continue", 3),
+    ]
+    const state = createSessionState()
+    const config = buildConfig("range")
+
+    assignMessageRefs(state, messages)
+    injectMessageIds(state, config, messages)
+
+    const emptyAssistant = messages[1]!
+    assert.equal(emptyAssistant.parts.length, 0, "empty assistant should get no synthetic parts")
+})
+
+test("injectMessageIds skips assistant with only pending tool parts (issue #463)", () => {
+    const sessionID = "ses_pending_tool_assistant"
+    const messages: WithParts[] = [
+        buildMessage("msg-user-1", "user", sessionID, "Hello", 1),
+        {
+            info: {
+                id: "msg-assistant-pending",
+                role: "assistant",
+                sessionID,
+                agent: "assistant",
+                time: { created: 2 },
+            } as WithParts["info"],
+            parts: [
+                {
+                    id: "pending-tool-part",
+                    messageID: "msg-assistant-pending",
+                    sessionID,
+                    type: "tool" as const,
+                    tool: "bash",
+                    callID: "call-pending-1",
+                    state: {
+                        status: "pending" as const,
+                        input: { command: "ls" },
+                    },
+                } as any,
+            ],
+        },
+        buildMessage("msg-user-2", "user", sessionID, "continue", 3),
+    ]
+    const state = createSessionState()
+    const config = buildConfig("range")
+
+    assignMessageRefs(state, messages)
+    injectMessageIds(state, config, messages)
+
+    const pendingAssistant = messages[1]!
+    assert.equal(
+        pendingAssistant.parts.length,
+        1,
+        "assistant with only pending tools should not get a synthetic text part",
+    )
+    assert.equal(pendingAssistant.parts[0]!.type, "tool")
+})
+
+test("injectMessageIds skips assistant with empty text part (issue #463)", () => {
+    const sessionID = "ses_empty_text_assistant"
+    const messages: WithParts[] = [
+        buildMessage("msg-user-1", "user", sessionID, "Hello", 1),
+        {
+            info: {
+                id: "msg-assistant-empty-text",
+                role: "assistant",
+                sessionID,
+                agent: "assistant",
+                time: { created: 2 },
+            } as WithParts["info"],
+            parts: [textPart("msg-assistant-empty-text", sessionID, "empty-text-part", "")],
+        },
+        buildMessage("msg-user-2", "user", sessionID, "continue", 3),
+    ]
+    const state = createSessionState()
+    const config = buildConfig("range")
+
+    assignMessageRefs(state, messages)
+    injectMessageIds(state, config, messages)
+
+    const emptyTextAssistant = messages[1]!
+    assert.equal(emptyTextAssistant.parts.length, 1, "should not add a synthetic part")
+    assert.equal(
+        (emptyTextAssistant.parts[0] as any).text,
+        "",
+        "empty text part should remain untouched",
+    )
+})