diff --git a/extensions/llm-task/src/llm-task-tool.test.ts b/extensions/llm-task/src/llm-task-tool.test.ts
index 8b18c1f581cd..8df3fb0477e8 100644
--- a/extensions/llm-task/src/llm-task-tool.test.ts
+++ b/extensions/llm-task/src/llm-task-tool.test.ts
@@ -382,6 +382,20 @@ describe("llm-task tool (json-only)", () => {
     expect(call.messages).toEqual([{ role: "user", content: expect.stringContaining("TASK:\nx") }]);
   });
 
+  it("forwards caller cancellation to the isolated completion", async () => {
+    const controller = new AbortController();
+    const cancellation = new Error("caller cancelled");
+    complete.mockImplementationOnce(async (params) => {
+      controller.abort(cancellation);
+      params.signal?.throwIfAborted();
+      return completionResult(params, '{"ok":true}');
+    });
+
+    const tool = createLlmTaskTool(fakeApi());
+    await expect(tool.execute("id", { prompt: "x" }, controller.signal)).rejects.toBe(cancellation);
+    expect(firstIsolatedCompletionCall().signal).toBe(controller.signal);
+  });
+
   it("rejects malformed numeric run options before dispatch", async () => {
     const tool = createLlmTaskTool(fakeApi());
 
diff --git a/extensions/llm-task/src/llm-task-tool.ts b/extensions/llm-task/src/llm-task-tool.ts
index 6b1f487ead1e..4cfb47b4689b 100644
--- a/extensions/llm-task/src/llm-task-tool.ts
+++ b/extensions/llm-task/src/llm-task-tool.ts
@@ -132,7 +132,7 @@ export function createLlmTaskTool(api: OpenClawPluginApi) {
   return {
     ...llmTaskToolDefinition,
 
-    async execute(_id: string, params: LlmTaskParams) {
+    async execute(_id: string, params: LlmTaskParams, signal?: AbortSignal) {
       const prompt = typeof params.prompt === "string" ? params.prompt : "";
       if (!prompt.trim()) {
         throw new Error("prompt required");
@@ -235,6 +235,7 @@ export function createLlmTaskTool(api: OpenClawPluginApi) {
         reasoning: thinkLevel,
         maxTokens: streamParams.maxTokens,
         temperature: streamParams.temperature,
+        signal,
         purpose: "llm-task",
         execution: {
           mode: "isolated-agent-runtime",