diff --git a/lib/messages/inject.ts b/lib/messages/inject.ts
index 5d9b36f..132e784 100644
--- a/lib/messages/inject.ts
+++ b/lib/messages/inject.ts
@@ -3,7 +3,12 @@ import type { Logger } from "../logger"
 import type { PluginConfig } from "../config"
 import type { UserMessage } from "@opencode-ai/sdk/v2"
 import { loadPrompt } from "../prompts"
-import { extractParameterKey, buildToolIdList, createSyntheticUserMessage } from "./utils"
+import {
+    extractParameterKey,
+    buildToolIdList,
+    createSyntheticAssistantMessageWithToolPart,
+    createSyntheticUserMessage,
+} from "./utils"
 import { getFilePathFromParameters, isProtectedFilePath } from "../protected-file-patterns"
 import { getLastUserMessage } from "../shared-utils"
 
@@ -132,6 +137,28 @@ export const insertPruneToolContext = (
     if (!lastUserMessage) {
         return
     }
+
+    const userInfo = lastUserMessage.info as UserMessage
+    const providerID = userInfo.model.providerID
+    const isGitHubCopilot =
+        providerID === "github-copilot" || providerID === "github-copilot-enterprise"
+
+    logger.info("Injecting prunable-tools list", {
+        providerID,
+        isGitHubCopilot,
+        injectionType: isGitHubCopilot ? "assistant-with-tool-part" : "user-message",
+    })
+
     const variant = state.variant ?? (lastUserMessage.info as UserMessage).variant
-    messages.push(createSyntheticUserMessage(lastUserMessage, prunableToolsContent, variant))
+    if (isGitHubCopilot) {
+        messages.push(
+            createSyntheticAssistantMessageWithToolPart(
+                lastUserMessage,
+                prunableToolsContent,
+                variant,
+            ),
+        )
+    } else {
+        messages.push(createSyntheticUserMessage(lastUserMessage, prunableToolsContent, variant))
+    }
 }
diff --git a/lib/messages/utils.ts b/lib/messages/utils.ts
index 0338d86..9a9a2d8 100644
--- a/lib/messages/utils.ts
+++ b/lib/messages/utils.ts
@@ -5,6 +5,7 @@ import type { UserMessage } from "@opencode-ai/sdk/v2"
 
 const SYNTHETIC_MESSAGE_ID = "msg_01234567890123456789012345"
 const SYNTHETIC_PART_ID = "prt_01234567890123456789012345"
+const SYNTHETIC_CALL_ID = "call_01234567890123456789012345"
 
 export const createSyntheticUserMessage = (
     baseMessage: WithParts,
@@ -37,6 +38,53 @@ export const createSyntheticUserMessage = (
     }
 }
 
+export const createSyntheticAssistantMessageWithToolPart = (
+    baseMessage: WithParts,
+    content: string,
+    variant?: string,
+): WithParts => {
+    const userInfo = baseMessage.info as UserMessage
+    const now = Date.now()
+    return {
+        info: {
+            id: SYNTHETIC_MESSAGE_ID,
+            sessionID: userInfo.sessionID,
+            role: "assistant",
+            agent: userInfo.agent || "code",
+            parentID: userInfo.id,
+            modelID: userInfo.model.modelID,
+            providerID: userInfo.model.providerID,
+            mode: "default",
+            path: {
+                cwd: "/",
+                root: "/",
+            },
+            time: { created: now, completed: now },
+            cost: 0,
+            tokens: { input: 0, output: 0, reasoning: 0, cache: { read: 0, write: 0 } },
+            ...(variant !== undefined && { variant }),
+        },
+        parts: [
+            {
+                id: SYNTHETIC_PART_ID,
+                sessionID: userInfo.sessionID,
+                messageID: SYNTHETIC_MESSAGE_ID,
+                type: "tool",
+                callID: SYNTHETIC_CALL_ID,
+                tool: "context_info",
+                state: {
+                    status: "completed",
+                    input: {},
+                    output: content,
+                    title: "Context Info",
+                    metadata: {},
+                    time: { start: now, end: now },
+                },
+            },
+        ],
+    }
+}
+
 /**
  * Extracts a human-readable key from tool metadata for display purposes.
  */
diff --git a/package-lock.json b/package-lock.json
index 9cede6e..d06ba6d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,12 +1,12 @@
 {
     "name": "@tarquinen/opencode-dcp",
-    "version": "1.1.5",
+    "version": "1.1.6",
     "lockfileVersion": 3,
     "requires": true,
     "packages": {
         "": {
             "name": "@tarquinen/opencode-dcp",
-            "version": "1.1.5",
+            "version": "1.1.6",
             "license": "MIT",
             "dependencies": {
                 "@opencode-ai/sdk": "^1.1.3",
diff --git a/package.json b/package.json
index f6305ca..2c9e86a 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
     "$schema": "https://json.schemastore.org/package.json",
     "name": "@tarquinen/opencode-dcp",
-    "version": "1.1.5",
+    "version": "1.1.6",
     "type": "module",
     "description": "OpenCode plugin that optimizes token usage by pruning obsolete tool outputs from conversation context",
     "main": "./dist/index.js",