diff --git a/locales/en-US/plugin.json b/locales/en-US/plugin.json
index 9eca1c835b..71cc3f1144 100644
--- a/locales/en-US/plugin.json
+++ b/locales/en-US/plugin.json
@@ -60,6 +60,9 @@
   "builtins.lobe-gtd.apiName.createPlan": "Create plan",
   "builtins.lobe-gtd.apiName.createPlan.result": "Create plan: <goal>{{goal}}</goal>",
   "builtins.lobe-gtd.apiName.createTodos": "Create todos",
+  "builtins.lobe-gtd.apiName.execTask": "Execute task",
+  "builtins.lobe-gtd.apiName.execTask.result": "Execute: <desc>{{description}}</desc>",
+  "builtins.lobe-gtd.apiName.execTasks": "Execute tasks",
   "builtins.lobe-gtd.apiName.removeTodos": "Delete todos",
   "builtins.lobe-gtd.apiName.updatePlan": "Update plan",
   "builtins.lobe-gtd.apiName.updatePlan.completed": "Completed",
diff --git a/locales/zh-CN/plugin.json b/locales/zh-CN/plugin.json
index 0eb9680a7a..3bc34d0df3 100644
--- a/locales/zh-CN/plugin.json
+++ b/locales/zh-CN/plugin.json
@@ -60,6 +60,9 @@
   "builtins.lobe-gtd.apiName.createPlan": "创建计划",
   "builtins.lobe-gtd.apiName.createPlan.result": "创建计划：<goal>{{goal}}</goal>",
   "builtins.lobe-gtd.apiName.createTodos": "创建待办",
+  "builtins.lobe-gtd.apiName.execTask": "执行任务",
+  "builtins.lobe-gtd.apiName.execTask.result": "执行：<desc>{{description}}</desc>",
+  "builtins.lobe-gtd.apiName.execTasks": "执行多个任务",
   "builtins.lobe-gtd.apiName.removeTodos": "删除待办",
   "builtins.lobe-gtd.apiName.updatePlan": "更新计划",
   "builtins.lobe-gtd.apiName.updatePlan.completed": "已完成",
diff --git a/packages/agent-runtime/src/agents/GeneralChatAgent.ts b/packages/agent-runtime/src/agents/GeneralChatAgent.ts
index 7f14d00958..0a52db4acf 100644
--- a/packages/agent-runtime/src/agents/GeneralChatAgent.ts
+++ b/packages/agent-runtime/src/agents/GeneralChatAgent.ts
@@ -13,6 +13,8 @@ import {
   GeneralAgentCallingToolInstructionPayload,
   GeneralAgentConfig,
   HumanAbortPayload,
+  TaskResultPayload,
+  TasksBatchResultPayload,
 } from '../types';
 
 /**
@@ -315,7 +317,37 @@ export class GeneralChatAgent implements Agent {
       }
 
       case 'tool_result': {
-        const { parentMessageId } = context.payload as GeneralAgentCallToolResultPayload;
+        const { data, parentMessageId, stop } =
+          context.payload as GeneralAgentCallToolResultPayload;
+
+        // Check if this is a GTD async task request (only execTask/execTasks are passed here with stop=true)
+        if (stop && data?.state) {
+          const stateType = data.state.type;
+
+          // GTD async task (single)
+          if (stateType === 'execTask') {
+            const { parentMessageId: execParentId, task } = data.state as {
+              parentMessageId: string;
+              task: any;
+            };
+            return {
+              payload: { parentMessageId: execParentId, task },
+              type: 'exec_task',
+            };
+          }
+
+          // GTD async tasks (multiple)
+          if (stateType === 'execTasks') {
+            const { parentMessageId: execParentId, tasks } = data.state as {
+              parentMessageId: string;
+              tasks: any[];
+            };
+            return {
+              payload: { parentMessageId: execParentId, tasks },
+              type: 'exec_tasks',
+            };
+          }
+        }
 
         // Check if there are still pending tool messages waiting for approval
         const pendingToolMessages = state.messages.filter(
@@ -380,6 +412,40 @@ export class GeneralChatAgent implements Agent {
         };
       }
 
+      case 'task_result': {
+        // Single async task completed, continue to call LLM with result
+        const { parentMessageId } = context.payload as TaskResultPayload;
+
+        // Continue to call LLM with updated messages (task message is already in state)
+        return {
+          payload: {
+            messages: state.messages,
+            model: this.config.modelRuntimeConfig?.model,
+            parentMessageId,
+            provider: this.config.modelRuntimeConfig?.provider,
+            tools: state.tools,
+          } as GeneralAgentCallLLMInstructionPayload,
+          type: 'call_llm',
+        };
+      }
+
+      case 'tasks_batch_result': {
+        // Async tasks batch completed, continue to call LLM with results
+        const { parentMessageId } = context.payload as TasksBatchResultPayload;
+
+        // Continue to call LLM with updated messages (task messages are already in state)
+        return {
+          payload: {
+            messages: state.messages,
+            model: this.config.modelRuntimeConfig?.model,
+            parentMessageId,
+            provider: this.config.modelRuntimeConfig?.provider,
+            tools: state.tools,
+          } as GeneralAgentCallLLMInstructionPayload,
+          type: 'call_llm',
+        };
+      }
+
       case 'human_abort': {
         // User aborted the operation
         const { hasToolsCalling, parentMessageId, toolsCalling, reason } =
diff --git a/packages/agent-runtime/src/agents/__tests__/GeneralChatAgent.test.ts b/packages/agent-runtime/src/agents/__tests__/GeneralChatAgent.test.ts
index 2846773cf3..60cbc2bd9b 100644
--- a/packages/agent-runtime/src/agents/__tests__/GeneralChatAgent.test.ts
+++ b/packages/agent-runtime/src/agents/__tests__/GeneralChatAgent.test.ts
@@ -893,6 +893,164 @@ describe('GeneralChatAgent', () => {
     });
   });
 
+  describe('task_result phase (single task)', () => {
+    it('should return call_llm when task completed', async () => {
+      const agent = new GeneralChatAgent({
+        agentConfig: { maxSteps: 100 },
+        operationId: 'test-session',
+        modelRuntimeConfig: mockModelRuntimeConfig,
+      });
+
+      const state = createMockState({
+        messages: [
+          { role: 'user', content: 'Execute task' },
+          { role: 'assistant', content: '' },
+          { role: 'task', content: 'Task result', metadata: { instruction: 'Do task' } },
+        ] as any,
+      });
+
+      const context = createMockContext('task_result', {
+        parentMessageId: 'task-parent-msg',
+        result: { success: true, taskMessageId: 'task-1', threadId: 'thread-1', result: 'Task result' },
+      });
+
+      const result = await agent.runner(context, state);
+
+      expect(result).toEqual({
+        type: 'call_llm',
+        payload: {
+          messages: state.messages,
+          model: 'gpt-4o-mini',
+          parentMessageId: 'task-parent-msg',
+          provider: 'openai',
+          tools: undefined,
+        },
+      });
+    });
+
+    it('should return call_llm even when task failed', async () => {
+      const agent = new GeneralChatAgent({
+        agentConfig: { maxSteps: 100 },
+        operationId: 'test-session',
+        modelRuntimeConfig: mockModelRuntimeConfig,
+      });
+
+      const state = createMockState({
+        messages: [
+          { role: 'user', content: 'Execute task' },
+          { role: 'assistant', content: '' },
+          { role: 'task', content: 'Task failed: timeout', metadata: { instruction: 'Do task' } },
+        ] as any,
+      });
+
+      const context = createMockContext('task_result', {
+        parentMessageId: 'task-parent-msg',
+        result: {
+          success: false,
+          taskMessageId: 'task-1',
+          threadId: 'thread-1',
+          error: 'Task timeout after 1800000ms',
+        },
+      });
+
+      const result = await agent.runner(context, state);
+
+      expect(result).toEqual({
+        type: 'call_llm',
+        payload: {
+          messages: state.messages,
+          model: 'gpt-4o-mini',
+          parentMessageId: 'task-parent-msg',
+          provider: 'openai',
+          tools: undefined,
+        },
+      });
+    });
+  });
+
+  describe('tasks_batch_result phase (multiple tasks)', () => {
+    it('should return call_llm when tasks completed', async () => {
+      const agent = new GeneralChatAgent({
+        agentConfig: { maxSteps: 100 },
+        operationId: 'test-session',
+        modelRuntimeConfig: mockModelRuntimeConfig,
+      });
+
+      const state = createMockState({
+        messages: [
+          { role: 'user', content: 'Execute tasks' },
+          { role: 'assistant', content: '' },
+          { role: 'task', content: 'Task 1 result', metadata: { instruction: 'Do task 1' } },
+          { role: 'task', content: 'Task 2 result', metadata: { instruction: 'Do task 2' } },
+        ] as any,
+      });
+
+      const context = createMockContext('tasks_batch_result', {
+        parentMessageId: 'task-parent-msg',
+        results: [
+          { success: true, taskMessageId: 'task-1', threadId: 'thread-1', result: 'Task 1 result' },
+          { success: true, taskMessageId: 'task-2', threadId: 'thread-2', result: 'Task 2 result' },
+        ],
+      });
+
+      const result = await agent.runner(context, state);
+
+      expect(result).toEqual({
+        type: 'call_llm',
+        payload: {
+          messages: state.messages,
+          model: 'gpt-4o-mini',
+          parentMessageId: 'task-parent-msg',
+          provider: 'openai',
+          tools: undefined,
+        },
+      });
+    });
+
+    it('should return call_llm even when some tasks failed', async () => {
+      const agent = new GeneralChatAgent({
+        agentConfig: { maxSteps: 100 },
+        operationId: 'test-session',
+        modelRuntimeConfig: mockModelRuntimeConfig,
+      });
+
+      const state = createMockState({
+        messages: [
+          { role: 'user', content: 'Execute tasks' },
+          { role: 'assistant', content: '' },
+          { role: 'task', content: 'Task 1 result', metadata: { instruction: 'Do task 1' } },
+          { role: 'task', content: 'Task failed: timeout', metadata: { instruction: 'Do task 2' } },
+        ] as any,
+      });
+
+      const context = createMockContext('tasks_batch_result', {
+        parentMessageId: 'task-parent-msg',
+        results: [
+          { success: true, taskMessageId: 'task-1', threadId: 'thread-1', result: 'Task 1 result' },
+          {
+            success: false,
+            taskMessageId: 'task-2',
+            threadId: 'thread-2',
+            error: 'Task timeout after 1800000ms',
+          },
+        ],
+      });
+
+      const result = await agent.runner(context, state);
+
+      expect(result).toEqual({
+        type: 'call_llm',
+        payload: {
+          messages: state.messages,
+          model: 'gpt-4o-mini',
+          parentMessageId: 'task-parent-msg',
+          provider: 'openai',
+          tools: undefined,
+        },
+      });
+    });
+  });
+
   describe('unknown phase', () => {
     it('should return finish instruction for unknown phase', async () => {
       const agent = new GeneralChatAgent({
diff --git a/packages/agent-runtime/src/types/generalAgent.ts b/packages/agent-runtime/src/types/generalAgent.ts
index 72d2ddaf27..8cc0fd9256 100644
--- a/packages/agent-runtime/src/types/generalAgent.ts
+++ b/packages/agent-runtime/src/types/generalAgent.ts
@@ -27,6 +27,8 @@ export interface GeneralAgentCallToolResultPayload {
   executionTime: number;
   isSuccess: boolean;
   parentMessageId: string;
+  /** Whether tool requested to stop execution (e.g., group management speak/delegate, GTD async tasks) */
+  stop?: boolean;
   toolCall: ChatToolPayload;
   toolCallId: string;
 }
diff --git a/packages/agent-runtime/src/types/instruction.ts b/packages/agent-runtime/src/types/instruction.ts
index ed90e49881..34238bb17a 100644
--- a/packages/agent-runtime/src/types/instruction.ts
+++ b/packages/agent-runtime/src/types/instruction.ts
@@ -35,6 +35,8 @@ export interface AgentRuntimeContext {
     | 'llm_result'
     | 'tool_result'
     | 'tools_batch_result'
+    | 'task_result'
+    | 'tasks_batch_result'
     | 'human_response'
     | 'human_approved_tool'
     | 'human_abort'
@@ -224,6 +226,88 @@ export interface AgentInstructionCompressContext {
   type: 'compress_context';
 }
 
+/**
+ * Task definition for exec_tasks instruction
+ */
+export interface ExecTaskItem {
+  /** Brief description of what this task does (shown in UI) */
+  description: string;
+  /** Whether to inherit context messages from parent conversation */
+  inheritMessages?: boolean;
+  /** Detailed instruction/prompt for the task execution */
+  instruction: string;
+  /** Timeout in milliseconds (optional, default 30 minutes) */
+  timeout?: number;
+}
+
+/**
+ * Instruction to execute a single async task
+ */
+export interface AgentInstructionExecTask {
+  payload: {
+    /** Parent message ID (tool message that triggered the task) */
+    parentMessageId: string;
+    /** Task to execute */
+    task: ExecTaskItem;
+  };
+  type: 'exec_task';
+}
+
+/**
+ * Instruction to execute multiple async tasks in parallel
+ */
+export interface AgentInstructionExecTasks {
+  payload: {
+    /** Parent message ID (tool message that triggered the tasks) */
+    parentMessageId: string;
+    /** Array of tasks to execute */
+    tasks: ExecTaskItem[];
+  };
+  type: 'exec_tasks';
+}
+
+/**
+ * Payload for task_result phase (single task)
+ */
+export interface TaskResultPayload {
+  /** Parent message ID */
+  parentMessageId: string;
+  /** Result from executed task */
+  result: {
+    /** Error message if task failed */
+    error?: string;
+    /** Task result content */
+    result?: string;
+    /** Whether the task completed successfully */
+    success: boolean;
+    /** Task message ID */
+    taskMessageId: string;
+    /** Thread ID where the task was executed */
+    threadId: string;
+  };
+}
+
+/**
+ * Payload for tasks_batch_result phase (multiple tasks)
+ */
+export interface TasksBatchResultPayload {
+  /** Parent message ID */
+  parentMessageId: string;
+  /** Results from executed tasks */
+  results: Array<{
+    /** Error message if task failed */
+    error?: string;
+    /** Task result content */
+    result?: string;
+    /** Whether the task completed successfully */
+    success: boolean;
+    /** Task message ID */
+    taskMessageId: string;
+    /** Thread ID where the task was executed */
+    threadId: string;
+  }>;
+}
+
 /**
  * A serializable instruction object that the "Agent" (Brain) returns
  * to the "AgentRuntime" (Engine) to execute.
@@ -232,6 +316,8 @@ export type AgentInstruction =
   | AgentInstructionCallLlm
   | AgentInstructionCallTool
   | AgentInstructionCallToolsBatch
+  | AgentInstructionExecTask
+  | AgentInstructionExecTasks
   | AgentInstructionRequestHumanPrompt
   | AgentInstructionRequestHumanSelect
   | AgentInstructionRequestHumanApprove
diff --git a/packages/builtin-agents/src/agents/inbox/systemRole.ts b/packages/builtin-agents/src/agents/inbox/systemRole.ts
index 9a36a50d6c..ba7aaeaf64 100644
--- a/packages/builtin-agents/src/agents/inbox/systemRole.ts
+++ b/packages/builtin-agents/src/agents/inbox/systemRole.ts
@@ -14,48 +14,4 @@ Your role is to:
 - Provide clear and concise explanations
 - Be friendly and professional in your responses
 
-<builtin_tools_guidelines>
-You have access to two built-in tools: **Notebook** for content creation and **GTD** for task management.
-
-## Notebook Tool (createDocument)
-Use Notebook to create documents when:
-- User requests relatively long content (articles, reports, analyses, tutorials, guides)
-- User explicitly asks to "write", "draft", "create", "generate" substantial content
-- Output would exceed ~500 words or benefit from structured formatting
-- Content should be preserved for future reference or editing
-- Creating deliverables: blog posts, documentation, summaries, research notes
-
-**When to respond directly in chat instead**:
-- Short answers, explanations, or clarifications
-- Quick Q&A interactions
-- Code snippets or brief examples
-- Conversational exchanges
-
-## GTD Tool (createPlan, createTodos)
-**ONLY use GTD when user explicitly requests task/project management**:
-- User explicitly asks to "create a plan", "make a todo list", "track tasks"
-- User says "help me plan [project]", "organize my tasks", "remind me to..."
-- User provides a list of things they need to do and wants to track them
-
-**When NOT to use GTD** (respond in chat instead):
-- Answering questions (even if about "what to do" or "steps to take")
-- Providing advice, analysis, or opinions
-- Code review or technical consultations
-- Explaining concepts or procedures
-- Any question that starts with "Is...", "Can...", "Should...", "Would...", "What if..."
-- Security assessments or risk analysis
-
-**Key principle**: GTD is for ACTION TRACKING, not for answering questions. If the user is asking a question (even about tasks or plans), just answer it directly.
-
-## Choosing the Right Tool
-- "Write me an article about..." → Notebook
-- "Help me plan my project" → GTD (plan + todos)
-- "Create a to-do list for..." → GTD (todos)
-- "Draft a report on..." → Notebook
-- "What are the steps to..." → Chat (just explain)
-- "Is this code secure?" → Chat (just answer)
-- "Should I do X or Y?" → Chat (just advise)
-- "Remember to..." / "Add to my list..." → GTD (todos)
-</builtin_tools_guidelines>
-
 Respond in the same language the user is using.`;
diff --git a/packages/builtin-tool-gtd/src/client/Inspector/ExecTask/index.tsx b/packages/builtin-tool-gtd/src/client/Inspector/ExecTask/index.tsx
new file mode 100644
index 0000000000..c9c96a6e4f
--- /dev/null
+++ b/packages/builtin-tool-gtd/src/client/Inspector/ExecTask/index.tsx
@@ -0,0 +1,61 @@
+'use client';
+
+import type { BuiltinInspectorProps } from '@lobechat/types';
+import { createStaticStyles, cx } from 'antd-style';
+import { memo } from 'react';
+import { Trans, useTranslation } from 'react-i18next';
+
+import { shinyTextStyles } from '@/styles';
+
+import type { ExecTaskParams, ExecTaskState } from '../../../types';
+
+const styles = createStaticStyles(({ css, cssVar }) => ({
+  description: css`
+    padding-block-end: 1px;
+    color: ${cssVar.colorText};
+    background: linear-gradient(to top, ${cssVar.colorInfoBg} 40%, transparent 40%);
+  `,
+  root: css`
+    overflow: hidden;
+    display: -webkit-box;
+    -webkit-box-orient: vertical;
+    -webkit-line-clamp: 1;
+
+    color: ${cssVar.colorTextSecondary};
+  `,
+}));
+
+export const ExecTaskInspector = memo<BuiltinInspectorProps<ExecTaskParams, ExecTaskState>>(
+  ({ args, partialArgs, isArgumentsStreaming }) => {
+    const { t } = useTranslation('plugin');
+
+    const description = args?.description || partialArgs?.description;
+
+    if (isArgumentsStreaming && !description) {
+      return (
+        <div className={cx(styles.root, shinyTextStyles.shinyText)}>
+          <span>{t('builtins.lobe-gtd.apiName.execTask')}</span>
+        </div>
+      );
+    }
+
+    return (
+      <div className={cx(styles.root, isArgumentsStreaming && shinyTextStyles.shinyText)}>
+        {description ? (
+          <Trans
+            components={{ desc: <span className={styles.description} /> }}
+            i18nKey="builtins.lobe-gtd.apiName.execTask.result"
+            ns="plugin"
+            values={{ description }}
+          />
+        ) : (
+          <span>{t('builtins.lobe-gtd.apiName.execTask')}</span>
+        )}
+      </div>
+    );
+  },
+);
+
+ExecTaskInspector.displayName = 'ExecTaskInspector';
+
+export default ExecTaskInspector;
diff --git a/packages/builtin-tool-gtd/src/client/Inspector/ExecTasks/index.tsx b/packages/builtin-tool-gtd/src/client/Inspector/ExecTasks/index.tsx
new file mode 100644
index 0000000000..9366899dcc
--- /dev/null
+++ b/packages/builtin-tool-gtd/src/client/Inspector/ExecTasks/index.tsx
@@ -0,0 +1,62 @@
+'use client';
+
+import type { BuiltinInspectorProps } from '@lobechat/types';
+import { Icon } from '@lobehub/ui';
+import { createStaticStyles, cx } from 'antd-style';
+import { ListTodo } from 'lucide-react';
+import { memo } from 'react';
+import { useTranslation } from 'react-i18next';
+
+import { shinyTextStyles } from '@/styles';
+
+import type { ExecTasksParams, ExecTasksState } from '../../../types';
+
+const styles = createStaticStyles(({ css, cssVar }) => ({
+  count: css`
+    font-family: ${cssVar.fontFamilyCode};
+    color: ${cssVar.colorInfo};
+  `,
+  root: css`
+    overflow: hidden;
+    display: -webkit-box;
+    -webkit-box-orient: vertical;
+    -webkit-line-clamp: 1;
+  `,
+  title: css`
+    margin-inline-end: 8px;
+    color: ${cssVar.colorText};
+  `,
+}));
+
+export const ExecTasksInspector = memo<BuiltinInspectorProps<ExecTasksParams, ExecTasksState>>(
+  ({ args, partialArgs, isArgumentsStreaming }) => {
+    const { t } = useTranslation('plugin');
+
+    const tasks = args?.tasks || partialArgs?.tasks || [];
+    const count = tasks.length;
+
+    if (isArgumentsStreaming && count === 0) {
+      return (
+        <div className={cx(styles.root, shinyTextStyles.shinyText)}>
+          <span>{t('builtins.lobe-gtd.apiName.execTasks')}</span>
+        </div>
+      );
+    }
+
+    return (
+      <div className={cx(styles.root, isArgumentsStreaming && shinyTextStyles.shinyText)}>
+        <span className={styles.title}>{t('builtins.lobe-gtd.apiName.execTasks')}</span>
+        {count > 0 && (
+          <span className={styles.count}>
+            <Icon icon={ListTodo} size={12} />
+            {count}
+          </span>
+        )}
+      </div>
+    );
+  },
+);
+
+ExecTasksInspector.displayName = 'ExecTasksInspector';
+
+export default ExecTasksInspector;
diff --git a/packages/builtin-tool-gtd/src/client/Inspector/index.ts b/packages/builtin-tool-gtd/src/client/Inspector/index.ts
index 5073dc68f2..5b8913c813 100644
--- a/packages/builtin-tool-gtd/src/client/Inspector/index.ts
+++ b/packages/builtin-tool-gtd/src/client/Inspector/index.ts
@@ -5,6 +5,8 @@ import { ClearTodosInspector } from './ClearTodos';
 import { CompleteTodosInspector } from './CompleteTodos';
 import { CreatePlanInspector } from './CreatePlan';
 import { CreateTodosInspector } from './CreateTodos';
+import { ExecTaskInspector } from './ExecTask';
+import { ExecTasksInspector } from './ExecTasks';
 import { RemoveTodosInspector } from './RemoveTodos';
 import { UpdatePlanInspector } from './UpdatePlan';
 import { UpdateTodosInspector } from './UpdateTodos';
@@ -20,6 +22,8 @@ export const GTDInspectors: Record<string, BuiltinInspector> = {
   [GTDApiName.completeTodos]: CompleteTodosInspector as BuiltinInspector,
   [GTDApiName.createPlan]: CreatePlanInspector as BuiltinInspector,
   [GTDApiName.createTodos]: CreateTodosInspector as BuiltinInspector,
+  [GTDApiName.execTask]: ExecTaskInspector as BuiltinInspector,
+  [GTDApiName.execTasks]: ExecTasksInspector as BuiltinInspector,
   [GTDApiName.removeTodos]: RemoveTodosInspector as BuiltinInspector,
   [GTDApiName.updatePlan]: UpdatePlanInspector as BuiltinInspector,
   [GTDApiName.updateTodos]: UpdateTodosInspector as BuiltinInspector,
diff --git a/packages/builtin-tool-gtd/src/client/Streaming/ExecTask/index.tsx b/packages/builtin-tool-gtd/src/client/Streaming/ExecTask/index.tsx
new file mode 100644
index 0000000000..a34c1891bf
--- /dev/null
+++ b/packages/builtin-tool-gtd/src/client/Streaming/ExecTask/index.tsx
@@ -0,0 +1,47 @@
+'use client';
+
+import type { BuiltinStreamingProps } from '@lobechat/types';
+import { Markdown } from '@lobehub/ui';
+import { createStaticStyles } from 'antd-style';
+import { memo } from 'react';
+
+import type { ExecTaskParams } from '../../../types';
+
+const styles = createStaticStyles(({ css, cssVar }) => ({
+  container: css`
+    padding: 12px;
+    border-radius: 8px;
+    background: ${cssVar.colorFillQuaternary};
+  `,
+  description: css`
+    margin-bottom: 8px;
+    font-weight: 500;
+    color: ${cssVar.colorText};
+  `,
+  instruction: css`
+    font-size: 13px;
+    color: ${cssVar.colorTextSecondary};
+  `,
+}));
+
+export const ExecTaskStreaming = memo<BuiltinStreamingProps<ExecTaskParams>>(({ args }) => {
+  const { instruction } = args || {};
+
+  if (!instruction) return null;
+
+  return (
+    <div className={styles.container}>
+      {instruction && (
+        <div className={styles.instruction}>
+          <Markdown animated variant={'chat'}>
+            {instruction}
+          </Markdown>
+        </div>
+      )}
+    </div>
+  );
+});
+
+ExecTaskStreaming.displayName = 'ExecTaskStreaming';
+
+export default ExecTaskStreaming;
diff --git a/packages/builtin-tool-gtd/src/client/Streaming/ExecTasks/index.tsx b/packages/builtin-tool-gtd/src/client/Streaming/ExecTasks/index.tsx
new file mode 100644
index 0000000000..493a7a2cdf
--- /dev/null
+++ b/packages/builtin-tool-gtd/src/client/Streaming/ExecTasks/index.tsx
@@ -0,0 +1,56 @@
+'use client';
+
+import type { BuiltinStreamingProps } from '@lobechat/types';
+import { Markdown } from '@lobehub/ui';
+import { createStaticStyles } from 'antd-style';
+import { memo } from 'react';
+
+import type { ExecTasksParams } from '../../../types';
+
+const styles = createStaticStyles(({ css, cssVar }) => ({
+  container: css`
+    display: flex;
+    flex-direction: column;
+    gap: 8px;
+  `,
+  description: css`
+    font-weight: 500;
+    color: ${cssVar.colorText};
+  `,
+  instruction: css`
+    font-size: 13px;
+    color: ${cssVar.colorTextSecondary};
+  `,
+  taskItem: css`
+    padding: 12px;
+    border-radius: 8px;
+    background: ${cssVar.colorFillQuaternary};
+  `,
+}));
+
+export const ExecTasksStreaming = memo<BuiltinStreamingProps<ExecTasksParams>>(({ args }) => {
+  const { tasks } = args || {};
+
+  if (!tasks || tasks.length === 0) return null;
+
+  return (
+    <div className={styles.container}>
+      {tasks.map((task, index) => (
+        <div className={styles.taskItem} key={index}>
+          {task.description && <div className={styles.description}>{task.description}</div>}
+          {task.instruction && (
+            <div className={styles.instruction}>
+              <Markdown animated variant={'chat'}>
+                {task.instruction}
+              </Markdown>
+            </div>
+          )}
+        </div>
+      ))}
+    </div>
+  );
+});
+
+ExecTasksStreaming.displayName = 'ExecTasksStreaming';
+
+export default ExecTasksStreaming;
diff --git a/packages/builtin-tool-gtd/src/client/Streaming/index.ts b/packages/builtin-tool-gtd/src/client/Streaming/index.ts
new file mode 100644
index 0000000000..8f56c47378
--- /dev/null
+++ b/packages/builtin-tool-gtd/src/client/Streaming/index.ts
@@ -0,0 +1,18 @@
+import type { BuiltinStreaming } from '@lobechat/types';
+
+import { GTDApiName } from '../../types';
+import { ExecTaskStreaming } from './ExecTask';
+import { ExecTasksStreaming } from './ExecTasks';
+
+/**
+ * GTD Streaming Components Registry
+ *
+ * Streaming components render tool calls while they are
+ * still executing, allowing real-time feedback to users.
+ */
+export const GTDStreamings: Record<string, BuiltinStreaming> = {
+  [GTDApiName.execTask]: ExecTaskStreaming as BuiltinStreaming,
+  [GTDApiName.execTasks]: ExecTasksStreaming as BuiltinStreaming,
+};
+
+export { ExecTaskStreaming, ExecTasksStreaming };
diff --git a/packages/builtin-tool-gtd/src/client/index.ts b/packages/builtin-tool-gtd/src/client/index.ts
index a31b1b5b22..98a27abd9c 100644
--- a/packages/builtin-tool-gtd/src/client/index.ts
+++ b/packages/builtin-tool-gtd/src/client/index.ts
@@ -5,6 +5,9 @@ export { GTDInspectors } from './Inspector';
 export type { TodoListRenderState } from './Render';
 export { GTDRenders, TodoListRender, TodoListUI } from './Render';
 
+// Streaming components (real-time tool execution feedback)
+export { ExecTaskStreaming, ExecTasksStreaming, GTDStreamings } from './Streaming';
+
 // Intervention components (interactive editing)
 export { AddTodoIntervention, ClearTodosIntervention, GTDInterventions } from './Intervention';
 
diff --git a/packages/builtin-tool-gtd/src/executor/index.ts b/packages/builtin-tool-gtd/src/executor/index.ts
index b724d602c8..241d8e6f18 100644
--- a/packages/builtin-tool-gtd/src/executor/index.ts
+++ b/packages/builtin-tool-gtd/src/executor/index.ts
@@ -10,6 +10,8 @@ import {
   type CompleteTodosParams,
   type CreatePlanParams,
   type CreateTodosParams,
+  type ExecTaskParams,
+  type ExecTasksParams,
   GTDApiName,
   type Plan,
   type RemoveTodosParams,
@@ -19,12 +21,13 @@ import {
 } from '../types';
 import { getTodosFromContext } from './helper';
 
-// API enum for MVP (Todo + Plan)
-const GTDApiNameMVP = {
+const GTDApiNameEnum = {
   clearTodos: GTDApiName.clearTodos,
   completeTodos: GTDApiName.completeTodos,
   createPlan: GTDApiName.createPlan,
   createTodos: GTDApiName.createTodos,
+  execTask: GTDApiName.execTask,
+  execTasks: GTDApiName.execTasks,
   removeTodos: GTDApiName.removeTodos,
   updatePlan: GTDApiName.updatePlan,
   updateTodos: GTDApiName.updateTodos,
@@ -33,9 +36,9 @@ const GTDApiNameMVP = {
 /**
  * GTD Tool Executor
  */
-class GTDExecutor extends BaseExecutor<typeof GTDApiNameMVP> {
+class GTDExecutor extends BaseExecutor<typeof GTDApiNameEnum> {
   readonly identifier = GTDIdentifier;
-  protected readonly apiEnum = GTDApiNameMVP;
+  protected readonly apiEnum = GTDApiNameEnum;
 
   // ==================== Todo APIs ====================
 
@@ -477,6 +480,92 @@ class GTDExecutor extends BaseExecutor<typeof GTDApiNameMVP> {
       };
     }
   };
+
+  // ==================== Async Tasks API ====================
+
+  /**
+   * Execute a single async task
+   *
+   * This method triggers async task execution by returning a special state.
+   * The AgentRuntime's executor will recognize this state and trigger the exec_task instruction.
+   *
+   * Flow:
+   * 1. GTD tool returns stop: true with state.type = 'execTask'
+   * 2. AgentRuntime executor recognizes the state and triggers exec_task instruction
+   * 3. exec_task executor creates task message and polls for completion
+   */
+  execTask = async (
+    params: ExecTaskParams,
+    ctx: BuiltinToolContext,
+  ): Promise<BuiltinToolResult> => {
+    const { description, instruction, inheritMessages, timeout } = params;
+
+    if (!description || !instruction) {
+      return {
+        content: 'Task description and instruction are required.',
+        success: false,
+      };
+    }
+
+    // Return stop: true with special state that AgentRuntime will recognize
+    // The exec_task executor will be triggered by the runtime when it sees this state
+    return {
+      content: `🚀 Triggered async task for execution:\n- ${description}`,
+      state: {
+        parentMessageId: ctx.messageId,
+        task: {
+          description,
+          inheritMessages,
+          instruction,
+          timeout,
+        },
+        type: 'execTask',
+      },
+      stop: true,
+      success: true,
+    };
+  };
+
+  /**
+   * Execute one or more async tasks
+   *
+   * This method triggers async task execution by returning a special state.
+   * The AgentRuntime's executor will recognize this state and trigger the exec_tasks instruction.
+   *
+   * Flow:
+   * 1. GTD tool returns stop: true with state.type = 'execTasks'
+   * 2. AgentRuntime executor recognizes the state and triggers exec_tasks instruction
+   * 3. exec_tasks executor creates task messages and polls for completion
+   */
+  execTasks = async (
+    params: ExecTasksParams,
+    ctx: BuiltinToolContext,
+  ): Promise<BuiltinToolResult> => {
+    const { tasks } = params;
+
+    if (!tasks || tasks.length === 0) {
+      return {
+        content: 'No tasks provided to execute.',
+        success: false,
+      };
+    }
+
+    const taskCount = tasks.length;
+    const taskList = tasks.map((t, i) => `${i + 1}. ${t.description}`).join('\n');
+
+    // Return stop: true with special state that AgentRuntime will recognize
+    // The exec_tasks executor will be triggered by the runtime when it sees this state
+    return {
+      content: `🚀 Triggered ${taskCount} async task${taskCount > 1 ? 's' : ''} for execution:\n${taskList}`,
+      state: {
+        parentMessageId: ctx.messageId,
+        tasks,
+        type: 'execTasks',
+      },
+      stop: true,
+      success: true,
+    };
+  };
 }
 
 // Export the executor instance for registration
diff --git a/packages/builtin-tool-gtd/src/manifest.ts b/packages/builtin-tool-gtd/src/manifest.ts
index 6c956bdafa..dc7ed7b85c 100644
--- a/packages/builtin-tool-gtd/src/manifest.ts
+++ b/packages/builtin-tool-gtd/src/manifest.ts
@@ -37,12 +37,13 @@ export const GTDManifest: BuiltinToolManifest = {
     },
     {
       description:
-        'Update an existing plan document. Use this to modify the goal, description, context, or mark the plan as completed.',
+        'Update an existing plan document. Only use this when the goal fundamentally changes. Plans should remain stable once created - do not update plans just because details change.',
       name: GTDApiName.updatePlan,
       parameters: {
         properties: {
           planId: {
-            description: 'The ID of the plan to update.',
+            description:
+              'The document ID of the plan to update (e.g., "docs_xxx"). This ID is returned in the createPlan response. Do NOT use the goal text as planId.',
             type: 'string',
           },
           goal: {
@@ -57,10 +58,6 @@ export const GTDManifest: BuiltinToolManifest = {
             description: 'Updated detailed context.',
             type: 'string',
           },
-          completed: {
-            description: 'Mark the plan as completed.',
-            type: 'boolean',
-          },
         },
         required: ['planId'],
         type: 'object',
@@ -71,8 +68,7 @@ export const GTDManifest: BuiltinToolManifest = {
     {
       description: 'Create new todo items. Pass an array of text strings.',
       name: GTDApiName.createTodos,
-      humanIntervention: 'always',
-      renderDisplayControl: 'expand',
+      humanIntervention: 'required',
       parameters: {
         properties: {
           adds: {
@@ -179,6 +175,74 @@ export const GTDManifest: BuiltinToolManifest = {
         type: 'object',
       },
     },
+
+    // ==================== Async Tasks ====================
+    {
+      description:
+        'Execute a single long-running async task. The task runs in an isolated context and can take significant time to complete. Use this for a single complex operation that requires extended processing.',
+      name: GTDApiName.execTask,
+      parameters: {
+        properties: {
+          description: {
+            description: 'Brief description of what this task does (shown in UI).',
+            type: 'string',
+          },
+          instruction: {
+            description: 'Detailed instruction/prompt for the task execution.',
+            type: 'string',
+          },
+          inheritMessages: {
+            description:
+              'Whether to inherit context messages from the parent conversation. Default is false.',
+            type: 'boolean',
+          },
+          timeout: {
+            description: 'Optional timeout in milliseconds. Default is 30 minutes.',
+            type: 'number',
+          },
+        },
+        required: ['description', 'instruction'],
+        type: 'object',
+      },
+    },
+    {
+      description:
+        'Execute one or more long-running async tasks. Each task runs in an isolated context and can take significant time to complete. Use this for complex operations that require extended processing.',
+      name: GTDApiName.execTasks,
+      parameters: {
+        properties: {
+          tasks: {
+            description: 'Array of tasks to execute asynchronously.',
+            items: {
+              properties: {
+                description: {
+                  description: 'Brief description of what this task does (shown in UI).',
+                  type: 'string',
+                },
+                instruction: {
+                  description: 'Detailed instruction/prompt for the task execution.',
+                  type: 'string',
+                },
+                inheritMessages: {
+                  description:
+                    'Whether to inherit context messages from the parent conversation. Default is false.',
+                  type: 'boolean',
+                },
+                timeout: {
+                  description: 'Optional timeout in milliseconds. Default is 30 minutes.',
+                  type: 'number',
+                },
+              },
+              required: ['description', 'instruction'],
+              type: 'object',
+            },
+            type: 'array',
+          },
+        },
+        required: ['tasks'],
+        type: 'object',
+      },
+    },
   ],
   identifier: GTDIdentifier,
   meta: {
diff --git a/packages/builtin-tool-gtd/src/systemRole.ts b/packages/builtin-tool-gtd/src/systemRole.ts
index 359d18c6e6..1aa2570333 100644
--- a/packages/builtin-tool-gtd/src/systemRole.ts
+++ b/packages/builtin-tool-gtd/src/systemRole.ts
@@ -1,12 +1,13 @@
-export const systemPrompt = `You have GTD (Getting Things Done) tools to help manage plans and todos effectively. These tools support two levels of task management:
+export const systemPrompt = `You have GTD (Getting Things Done) tools to help manage plans, todos and tasks effectively. These tools support three levels of task management:
 
-- **Plan**: A high-level strategic document describing goals, context, and overall direction. Plans do NOT contain actionable steps - they define the "what" and "why".
-- **Todo**: The concrete execution list with actionable items. Todos define the "how" - specific tasks to accomplish the plan.
+- **Plan**: A high-level strategic document describing goals, context, and overall direction. Plans do NOT contain actionable steps - they define the "what" and "why". **Plans should be stable once created** - they represent the overarching objective that rarely changes.
+- **Todo**: The concrete execution list with actionable items. Todos define the "how" - specific tasks to accomplish the plan. **Todos are dynamic** - they can be added, updated, completed, and removed as work progresses.
+- **Task**: Long-running async operations that execute in isolated contexts. Tasks are for complex, multi-step operations that require extended processing time. **Tasks run independently** - they can inherit context but execute separately from the main conversation.
 
 <tool_overview>
 **Planning Tools** - For high-level goal documentation:
 - \`createPlan\`: Create a strategic plan document with goal and context
-- \`updatePlan\`: Update plan details or mark as completed
+- \`updatePlan\`: Update plan details
 
 **Todo Tools** - For actionable execution items:
 - \`createTodos\`: Create new todo items from text array
@@ -14,11 +15,14 @@ export const systemPrompt = `You have GTD (Getting Things Done) tools to help ma
 - \`completeTodos\`: Mark items as done by indices
 - \`removeTodos\`: Remove items by indices
 - \`clearTodos\`: Clear completed or all items
+
+**Async Task Tools** - For long-running background tasks:
+- \`execTask\`: Execute a single async task in isolated context
+- \`execTasks\`: Execute multiple async tasks in parallel
 </tool_overview>
 
 <default_workflow>
 **IMPORTANT: Always create a Plan first, then Todos.**
-
 When a user asks you to help with a task, goal, or project:
 1. **First**, use \`createPlan\` to document the goal and relevant context
 2. **Then**, use \`createTodos\` to break down the plan into actionable steps
@@ -47,6 +51,26 @@ This "Plan-First" approach ensures:
 - User explicitly requests only action items
 - Capturing quick, simple tasks that don't need planning
 - Tracking progress on concrete deliverables
+
+**Use Async Tasks when:**
+- **The request requires gathering external information**: User wants you to research, investigate, or find information that you don't already know. This requires web searches, reading multiple sources, and synthesizing information.
+- **The task involves multiple steps**: The request cannot be answered in one simple response - it requires searching, reading, analyzing, and summarizing.
+- **Quality depends on thorough investigation**: A superficial answer would be insufficient; the user expects comprehensive, well-researched results.
+- **Independent execution is beneficial**: The task can run separately while freeing up the main conversation.
+
+**How to identify async task scenarios:**
+Ask yourself: "Can I answer this well from my existing knowledge, or does this require actively gathering new information?"
+- If you need to search the web, read articles, or investigate → Use async task
+- If you can answer directly from knowledge → Just respond
+
+Use \`execTask\` for a single task, \`execTasks\` for multiple parallel tasks.
+
+**Example scenarios:**
+- User asks about best restaurants in a city → execTask (needs current info from reviews, searches)
+- User wants research on a topic → execTask (multi-step: search, read, analyze, summarize)
+- User asks to compare products/services → execTask (needs to gather data from multiple sources)
+- User asks a factual question you know → Just answer directly
+- User wants multiple independent analyses → execTasks (parallel execution)
 </when_to_use>
 
 <best_practices>
@@ -58,6 +82,57 @@ This "Plan-First" approach ensures:
 - **Track progress**: Use todo completion to measure plan progress
 </best_practices>
 
+<todo_granularity>
+**IMPORTANT: Keep todos focused on major stages, not detailed sub-tasks.**
+
+- **Limit to 5-10 items**: A todo list should contain around 5-10 major milestones or stages, not 20+ detailed tasks.
+- **Think in phases**: Group related tasks into higher-level stages (e.g., "Plan itinerary" instead of listing every city separately).
+- **Use hierarchical numbering** when more detail is needed: Use "1.", "2.", "2.1", "2.2", "3." format to show parent-child relationships.
+
+**Good example** (Japan trip - 7 items, stage-focused):
+- 1. Determine travel dates and duration
+- 2. Handle visa and documentation
+- 3. Book flights and accommodation
+- 4. Plan city itineraries
+- 5. Arrange local transportation
+- 6. Prepare for departure
+- 7. Final confirmation before trip
+
+**Bad example** (20+ detailed items):
+- Book Tokyo hotel
+- Book Kyoto hotel
+- Book Osaka hotel
+- Buy Suica card
+- Download Google Maps
+- Download translation app
+- ... (too granular!)
+
+**When user needs more detail**, use hierarchical numbering:
+- 1. Determine travel dates
+- 2. Plan itinerary
+- 2.1 Tokyo attractions (3 days)
+- 2.2 Kyoto attractions (2 days)
+- 2.3 Osaka attractions (2 days)
+- 3. Handle bookings
+- 3.1 Flights
+- 3.2 Hotels
+- 3.3 JR Pass
+- 4. Departure preparation
+</todo_granularity>
+
+<plan_stability>
+**IMPORTANT: Plans should remain stable once created. Each conversation has only ONE plan.**
+
+- **Do NOT update plans** when details change (dates, locations, preferences). Instead, update the todos to reflect new information.
+- **Only use updatePlan** when the user's goal fundamentally changes (e.g., destination changes from Japan to Korea).
+- When user provides more specific information (like exact dates or preferences), **update or add todos** - not the plan.
+
+Example:
+- User: "Plan a trip to Japan" → Create plan with goal "Japan Trip"
+- User: "I want to go in February" → Update todos to include February-specific tasks, NOT update the plan
+- User: "Actually I want to go to Korea instead" → Use updatePlan to change the goal to "Korea Trip" (fundamental goal change)
+</plan_stability>
+
 <response_format>
 When working with GTD tools:
 - Confirm actions: "Created plan: [goal]" or "Added [n] todo items"
diff --git a/packages/builtin-tool-gtd/src/types.ts b/packages/builtin-tool-gtd/src/types.ts
index b264560bc0..f78d2e798e 100644
--- a/packages/builtin-tool-gtd/src/types.ts
+++ b/packages/builtin-tool-gtd/src/types.ts
@@ -24,6 +24,13 @@ export const GTDApiName = {
   /** Create new todo items */
   createTodos: 'createTodos',
 
+  // ==================== Async Tasks ====================
+  /** Execute a single async task */
+  execTask: 'execTask',
+
+  /** Execute one or more async tasks */
+  execTasks: 'execTasks',
+
   /** Remove todo items by indices */
   removeTodos: 'removeTodos',
 
@@ -229,3 +236,67 @@ export interface UpdatePlanState {
   /** The updated plan document */
   plan: Plan;
 }
+
+// ==================== Async Tasks Types ====================
+
+/**
+ * Single task item for execution
+ */
+export interface ExecTaskItem {
+  /** Brief description of what this task does (shown in UI) */
+  description: string;
+  /** Whether to inherit context messages from parent conversation */
+  inheritMessages?: boolean;
+  /** Detailed instruction/prompt for the task execution */
+  instruction: string;
+  /** Timeout in milliseconds (optional, default 30 minutes) */
+  timeout?: number;
+}
+
+/**
+ * Parameters for execTask API
+ * Execute a single async task
+ */
+export interface ExecTaskParams {
+  /** Brief description of what this task does (shown in UI) */
+  description: string;
+  /** Whether to inherit context messages from parent conversation */
+  inheritMessages?: boolean;
+  /** Detailed instruction/prompt for the task execution */
+  instruction: string;
+  /** Timeout in milliseconds (optional, default 30 minutes) */
+  timeout?: number;
+}
+
+/**
+ * Parameters for execTasks API
+ * Execute one or more async tasks
+ */
+export interface ExecTasksParams {
+  /** Array of tasks to execute */
+  tasks: ExecTaskItem[];
+}
+
+/**
+ * State returned after triggering exec_task
+ */
+export interface ExecTaskState {
+  /** Parent message ID (tool message) */
+  parentMessageId: string;
+  /** The task definition that was triggered */
+  task: ExecTaskItem;
+  /** Type identifier for render component */
+  type: 'execTask';
+}
+
+/**
+ * State returned after triggering exec_tasks
+ */
+export interface ExecTasksState {
+  /** Parent message ID (tool message) */
+  parentMessageId: string;
+  /** Array of task definitions that were triggered */
+  tasks: ExecTaskItem[];
+  /** Type identifier for render component */
+  type: 'execTasks';
+}
diff --git a/src/features/Conversation/Messages/AssistantGroup/Tool/index.tsx b/src/features/Conversation/Messages/AssistantGroup/Tool/index.tsx
index 2e4ef232f3..f5f490aa0c 100644
--- a/src/features/Conversation/Messages/AssistantGroup/Tool/index.tsx
+++ b/src/features/Conversation/Messages/AssistantGroup/Tool/index.tsx
@@ -7,6 +7,7 @@ import { memo, useEffect, useState } from 'react';
 import Actions from '@/features/Conversation/Messages/AssistantGroup/Tool/Actions';
 import { useToolStore } from '@/store/tool';
 import { toolSelectors } from '@/store/tool/selectors';
+import { getBuiltinRender } from '@/tools/renders';
 import { getBuiltinStreaming } from '@/tools/streamings';
 
 import Inspectors from './Inspector';
@@ -79,6 +80,10 @@ const Tool = memo<GroupToolProps>(
     const hasStreamingRenderer = !!getBuiltinStreaming(identifier, apiName);
     const forceShowStreamingRender = isArgumentsStreaming && hasStreamingRenderer;
 
+    // Check if tool has custom render - if not, disable expand
+    // Custom render exists when: builtin render exists OR plugin type is not 'default'
+    const hasCustomRender = !!getBuiltinRender(identifier, apiName) || (!!type && type !== 'default');
+
     // Wrap handleExpand to prevent collapsing when alwaysExpand is set
     const wrappedHandleExpand = (expand?: boolean) => {
       // Block collapse action when alwaysExpand is set
@@ -117,6 +122,7 @@ const Tool = memo<GroupToolProps>(
             showPluginRender={showPluginRender}
           />
         }
+        allowExpand={hasCustomRender}
         itemKey={id}
         paddingBlock={4}
         paddingInline={4}
diff --git a/src/locales/default/plugin.ts b/src/locales/default/plugin.ts
index 084da3b235..629e72a367 100644
--- a/src/locales/default/plugin.ts
+++ b/src/locales/default/plugin.ts
@@ -60,6 +60,9 @@ export default {
   'builtins.lobe-gtd.apiName.createPlan': 'Create plan',
   'builtins.lobe-gtd.apiName.createPlan.result': 'Create plan: <goal>{{goal}}</goal>',
   'builtins.lobe-gtd.apiName.createTodos': 'Create todos',
+  'builtins.lobe-gtd.apiName.execTask': 'Execute task',
+  'builtins.lobe-gtd.apiName.execTask.result': 'Execute: <desc>{{description}}</desc>',
+  'builtins.lobe-gtd.apiName.execTasks': 'Execute tasks',
   'builtins.lobe-gtd.apiName.removeTodos': 'Delete todos',
   'builtins.lobe-gtd.apiName.updatePlan': 'Update plan',
   'builtins.lobe-gtd.apiName.updatePlan.completed': 'Completed',
diff --git a/src/store/chat/agents/__tests__/createAgentExecutors/exec-task.test.ts b/src/store/chat/agents/__tests__/createAgentExecutors/exec-task.test.ts
new file mode 100644
index 0000000000..57b8fa8d60
--- /dev/null
+++ b/src/store/chat/agents/__tests__/createAgentExecutors/exec-task.test.ts
@@ -0,0 +1,479 @@
+import type { AgentRuntimeContext, TaskResultPayload } from '@lobechat/agent-runtime';
+import type { Mock } from 'vitest';
+import { describe, expect, it, vi } from 'vitest';
+
+import { aiAgentService } from '@/services/aiAgent';
+
+import { createExecTaskInstruction } from './fixtures';
+import { createMockStore } from './fixtures/mockStore';
+import { createInitialState, createTestContext, executeWithMockContext } from './helpers';
+
+// Mock aiAgentService
+vi.mock('@/services/aiAgent', () => ({
+  aiAgentService: {
+    execSubAgentTask: vi.fn(),
+    getSubAgentTaskStatus: vi.fn(),
+  },
+}));
+
+// Helper to get typed mocks
+const mockExecSubAgentTask = aiAgentService.execSubAgentTask as Mock;
+const mockGetSubAgentTaskStatus = aiAgentService.getSubAgentTaskStatus as Mock;
+
+describe('exec_task executor', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  describe('Basic Behavior', () => {
+    it('should execute single task successfully', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTaskInstruction(
+        { description: 'Test task', instruction: 'Do something' },
+        'msg_parent',
+      );
+      const state = createInitialState({ operationId: 'test-op' });
+
+      // Mock task message creation
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      // Mock task execution
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      // Mock task status polling - completed on first poll
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        result: 'Task completed successfully',
+        status: 'completed',
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(result.nextContext).toBeDefined();
+      expect((result.nextContext as AgentRuntimeContext).phase).toBe('task_result');
+
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TaskResultPayload;
+      expect(payload.result).toBeDefined();
+      expect(payload.result.success).toBe(true);
+      expect(payload.result.threadId).toBe('thread_1');
+      expect(payload.result.taskMessageId).toBe('task_msg_1');
+    });
+  });
+
+  describe('Error Handling', () => {
+    it('should return error when no context available', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext({ agentId: undefined, topicId: null });
+      const instruction = createExecTaskInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      // Override operation context to have no agentId/topicId
+      mockStore.operations[context.operationId] = {
+        abortController: new AbortController(),
+        childOperationIds: [],
+        context: {
+          agentId: undefined,
+          topicId: undefined,
+        },
+        id: context.operationId,
+        metadata: { startTime: Date.now() },
+        status: 'running',
+        type: 'execAgentRuntime',
+      };
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(result.nextContext).toBeDefined();
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TaskResultPayload;
+      expect(payload.result.success).toBe(false);
+      expect(payload.result.error).toBe('No valid context available');
+    });
+
+    it('should handle task message creation failure', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTaskInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      // Mock task message creation failure
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce(null);
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TaskResultPayload;
+      expect(payload.result.success).toBe(false);
+      expect(payload.result.error).toBe('Failed to create task message');
+    });
+
+    it('should handle task creation API failure', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTaskInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: '',
+        error: 'API error',
+        operationId: '',
+        success: false,
+        threadId: '',
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TaskResultPayload;
+      expect(payload.result.success).toBe(false);
+      expect(payload.result.error).toBe('API error');
+      expect(mockStore.optimisticUpdateMessageContent).toHaveBeenCalledWith(
+        'task_msg_1',
+        'Task creation failed: API error',
+        undefined,
+        { operationId: 'test-op' },
+      );
+    });
+
+    it('should handle task execution failure', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTaskInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        error: 'Execution error',
+        status: 'failed',
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TaskResultPayload;
+      expect(payload.result.success).toBe(false);
+      expect(payload.result.error).toBe('Execution error');
+    });
+  });
+
+  describe('Task Status Polling', () => {
+    it('should update task message with taskDetail when completed', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTaskInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      // Return completed with taskDetail on first poll
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        result: 'Done',
+        status: 'completed',
+        taskDetail: { status: 'completed' },
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(mockStore.internal_dispatchMessage).toHaveBeenCalledWith(
+        {
+          id: 'task_msg_1',
+          type: 'updateMessage',
+          value: { taskDetail: { status: 'completed' } },
+        },
+        { operationId: 'test-op' },
+      );
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TaskResultPayload;
+      expect(payload.result.success).toBe(true);
+    });
+
+    it('should handle cancelled task status', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTaskInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      // Use mockImplementationOnce to ensure fresh mock behavior
+      mockGetSubAgentTaskStatus.mockImplementationOnce(async () => ({
+        status: 'cancel',
+      }));
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TaskResultPayload;
+      expect(payload.result.success).toBe(false);
+      expect(payload.result.error).toBe('Task was cancelled');
+      expect(mockStore.optimisticUpdateMessageContent).toHaveBeenCalledWith(
+        'task_msg_1',
+        'Task was cancelled',
+        undefined,
+        { operationId: 'test-op' },
+      );
+    });
+  });
+
+  describe('Operation Cancellation', () => {
+    it('should stop polling when operation is cancelled before poll', async () => {
+      // Given
+      const mockStore = createMockStore();
+      // Use same operationId for both context and state
+      const operationId = 'test-op';
+      const context = createTestContext({ operationId });
+      const instruction = createExecTaskInstruction();
+      const state = createInitialState({ operationId });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      // Mock execSubAgentTask to mark operation as cancelled after it's called
+      // This simulates cancellation happening right after task creation but before polling
+      mockExecSubAgentTask.mockImplementation(async () => {
+        // After task creation API is called, mark operation as cancelled
+        // This simulates cancellation happening right after task creation
+        mockStore.operations[operationId].status = 'cancelled';
+        return {
+          assistantMessageId: 'asst_1',
+          operationId: 'op_1',
+          success: true,
+          threadId: 'thread_1',
+        };
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TaskResultPayload;
+      expect(payload.result.success).toBe(false);
+      expect(payload.result.error).toBe('Operation cancelled');
+      // getSubAgentTaskStatus should not be called since operation was cancelled before poll
+      expect(mockGetSubAgentTaskStatus).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('Result Phase', () => {
+    it('should return task_result phase with correct session info', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTaskInstruction(
+        { description: 'Test', instruction: 'Test instruction' },
+        'msg_parent',
+      );
+      const state = createInitialState({ operationId: 'test-op', stepCount: 5 });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        result: 'Done',
+        status: 'completed',
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(result.nextContext).toBeDefined();
+      const nextContext = result.nextContext as AgentRuntimeContext;
+      expect(nextContext.phase).toBe('task_result');
+      expect(nextContext.session?.stepCount).toBe(6);
+      expect(nextContext.session?.status).toBe('running');
+
+      const payload = nextContext.payload as TaskResultPayload;
+      expect(payload.parentMessageId).toBe('msg_parent');
+    });
+
+    it('should update messages in newState from store', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTaskInstruction();
+      const state = createInitialState({ messages: [], operationId: 'test-op' });
+
+      const updatedMessages = [{ content: 'test', id: 'msg_1', role: 'user' }];
+      mockStore.dbMessagesMap[context.messageKey] = updatedMessages as any;
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        result: 'Done',
+        status: 'completed',
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(result.newState.messages).toEqual(updatedMessages);
+    });
+  });
+
+  describe('Task Message Creation', () => {
+    it('should create task message with correct parameters', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext({ agentId: 'agent_1', topicId: 'topic_1' });
+      const instruction = createExecTaskInstruction(
+        { description: 'Test task', instruction: 'Do something important' },
+        'msg_parent',
+      );
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        result: 'Done',
+        status: 'completed',
+      });
+
+      // When
+      await executeWithMockContext({
+        context,
+        executor: 'exec_task',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(mockStore.optimisticCreateMessage).toHaveBeenCalledWith(
+        {
+          agentId: 'agent_1',
+          content: '',
+          metadata: { instruction: 'Do something important' },
+          parentId: 'msg_parent',
+          role: 'task',
+          topicId: 'topic_1',
+        },
+        { operationId: 'test-op' },
+      );
+    });
+  });
+});
diff --git a/src/store/chat/agents/__tests__/createAgentExecutors/exec-tasks.test.ts b/src/store/chat/agents/__tests__/createAgentExecutors/exec-tasks.test.ts
new file mode 100644
index 0000000000..976acc7a6b
--- /dev/null
+++ b/src/store/chat/agents/__tests__/createAgentExecutors/exec-tasks.test.ts
@@ -0,0 +1,598 @@
+import type { AgentRuntimeContext, TasksBatchResultPayload } from '@lobechat/agent-runtime';
+import type { Mock } from 'vitest';
+import { describe, expect, it, vi } from 'vitest';
+
+import { aiAgentService } from '@/services/aiAgent';
+
+import { createExecTasksInstruction } from './fixtures';
+import { createMockStore } from './fixtures/mockStore';
+import { createInitialState, createTestContext, executeWithMockContext } from './helpers';
+
+// Mock aiAgentService
+vi.mock('@/services/aiAgent', () => ({
+  aiAgentService: {
+    execSubAgentTask: vi.fn(),
+    getSubAgentTaskStatus: vi.fn(),
+  },
+}));
+
+// Helper to get typed mocks
+const mockExecSubAgentTask = aiAgentService.execSubAgentTask as Mock;
+const mockGetSubAgentTaskStatus = aiAgentService.getSubAgentTaskStatus as Mock;
+
+describe('exec_tasks executor', () => {
+  beforeEach(() => {
+    vi.clearAllMocks();
+  });
+
+  describe('Basic Behavior', () => {
+    it('should execute single task successfully', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTasksInstruction(
+        [{ description: 'Test task 1', instruction: 'Do something' }],
+        'msg_parent',
+      );
+      const state = createInitialState({ operationId: 'test-op' });
+
+      // Mock task message creation
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      // Mock task execution
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      // Mock task status polling - completed on first poll
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        result: 'Task completed successfully',
+        status: 'completed',
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(result.nextContext).toBeDefined();
+      expect((result.nextContext as AgentRuntimeContext).phase).toBe('tasks_batch_result');
+
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TasksBatchResultPayload;
+      expect(payload.results).toHaveLength(1);
+      expect(payload.results[0].success).toBe(true);
+      expect(payload.results[0].threadId).toBe('thread_1');
+      expect(payload.results[0].taskMessageId).toBe('task_msg_1');
+    });
+
+    it('should execute multiple tasks in parallel', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTasksInstruction(
+        [
+          { description: 'Task 1', instruction: 'Do task 1' },
+          { description: 'Task 2', instruction: 'Do task 2' },
+          { description: 'Task 3', instruction: 'Do task 3' },
+        ],
+        'msg_parent',
+      );
+      const state = createInitialState({ operationId: 'test-op' });
+
+      // Mock task message creation for each task
+      (mockStore.optimisticCreateMessage as Mock)
+        .mockResolvedValueOnce({ id: 'task_msg_1' })
+        .mockResolvedValueOnce({ id: 'task_msg_2' })
+        .mockResolvedValueOnce({ id: 'task_msg_3' });
+
+      // Mock task execution for each task
+      mockExecSubAgentTask
+        .mockResolvedValueOnce({
+          assistantMessageId: 'asst_1',
+          operationId: 'op_1',
+          success: true,
+          threadId: 'thread_1',
+        })
+        .mockResolvedValueOnce({
+          assistantMessageId: 'asst_2',
+          operationId: 'op_2',
+          success: true,
+          threadId: 'thread_2',
+        })
+        .mockResolvedValueOnce({
+          assistantMessageId: 'asst_3',
+          operationId: 'op_3',
+          success: true,
+          threadId: 'thread_3',
+        });
+
+      // Mock task status polling - all completed
+      mockGetSubAgentTaskStatus
+        .mockResolvedValueOnce({ result: 'Result 1', status: 'completed' })
+        .mockResolvedValueOnce({ result: 'Result 2', status: 'completed' })
+        .mockResolvedValueOnce({ result: 'Result 3', status: 'completed' });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(result.nextContext).toBeDefined();
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TasksBatchResultPayload;
+      expect(payload.results).toHaveLength(3);
+      expect(payload.results.every((r) => r.success)).toBe(true);
+    });
+  });
+
+  describe('Error Handling', () => {
+    it('should return error when no context available', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext({ agentId: undefined, topicId: null });
+      const instruction = createExecTasksInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      // Override operation context to have no agentId/topicId
+      mockStore.operations[context.operationId] = {
+        abortController: new AbortController(),
+        childOperationIds: [],
+        context: {
+          agentId: undefined,
+          topicId: undefined,
+        },
+        id: context.operationId,
+        metadata: { startTime: Date.now() },
+        status: 'running',
+        type: 'execAgentRuntime',
+      };
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(result.nextContext).toBeDefined();
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TasksBatchResultPayload;
+      expect(payload.results).toHaveLength(1);
+      expect(payload.results[0].success).toBe(false);
+      expect(payload.results[0].error).toBe('No valid context available');
+    });
+
+    it('should handle task message creation failure', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTasksInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      // Mock task message creation failure
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce(null);
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TasksBatchResultPayload;
+      expect(payload.results[0].success).toBe(false);
+      expect(payload.results[0].error).toBe('Failed to create task message');
+    });
+
+    it('should handle task creation API failure', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTasksInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: '',
+        error: 'API error',
+        operationId: '',
+        success: false,
+        threadId: '',
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TasksBatchResultPayload;
+      expect(payload.results[0].success).toBe(false);
+      expect(payload.results[0].error).toBe('API error');
+      expect(mockStore.optimisticUpdateMessageContent).toHaveBeenCalledWith(
+        'task_msg_1',
+        'Task creation failed: API error',
+        undefined,
+        { operationId: 'test-op' },
+      );
+    });
+
+    it('should handle task execution failure', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTasksInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        error: 'Execution error',
+        status: 'failed',
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TasksBatchResultPayload;
+      expect(payload.results[0].success).toBe(false);
+      expect(payload.results[0].error).toBe('Execution error');
+    });
+  });
+
+  describe('Task Status Polling', () => {
+    it('should update task message with taskDetail when completed', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTasksInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      // Return completed with taskDetail on first poll
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        result: 'Done',
+        status: 'completed',
+        taskDetail: { status: 'completed' },
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(mockStore.internal_dispatchMessage).toHaveBeenCalledWith(
+        {
+          id: 'task_msg_1',
+          type: 'updateMessage',
+          value: { taskDetail: { status: 'completed' } },
+        },
+        { operationId: 'test-op' },
+      );
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TasksBatchResultPayload;
+      expect(payload.results[0].success).toBe(true);
+    });
+
+    it('should handle cancelled task status', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTasksInstruction();
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      // Use mockImplementationOnce to ensure fresh mock behavior
+      mockGetSubAgentTaskStatus.mockImplementationOnce(async () => ({
+        status: 'cancel',
+      }));
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TasksBatchResultPayload;
+      expect(payload.results[0].success).toBe(false);
+      expect(payload.results[0].error).toBe('Task was cancelled');
+      expect(mockStore.optimisticUpdateMessageContent).toHaveBeenCalledWith(
+        'task_msg_1',
+        'Task was cancelled',
+        undefined,
+        { operationId: 'test-op' },
+      );
+    });
+  });
+
+  describe('Operation Cancellation', () => {
+    it('should stop polling when operation is cancelled before poll', async () => {
+      // Given
+      const mockStore = createMockStore();
+      // Use same operationId for both context and state
+      const operationId = 'test-op';
+      const context = createTestContext({ operationId });
+      const instruction = createExecTasksInstruction();
+      const state = createInitialState({ operationId });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      // Mock execSubAgentTask to mark operation as cancelled after it's called
+      // This simulates cancellation happening right after task creation but before polling
+      mockExecSubAgentTask.mockImplementation(async () => {
+        // After task creation API is called, mark operation as cancelled
+        // This simulates cancellation happening right after task creation
+        // Note: state.operationId is used in the polling loop for cancellation check
+        mockStore.operations[operationId].status = 'cancelled';
+        return {
+          assistantMessageId: 'asst_1',
+          operationId: 'op_1',
+          success: true,
+          threadId: 'thread_1',
+        };
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TasksBatchResultPayload;
+      expect(payload.results[0].success).toBe(false);
+      expect(payload.results[0].error).toBe('Operation cancelled');
+      // getSubAgentTaskStatus should not be called since operation was cancelled before poll
+      expect(mockGetSubAgentTaskStatus).not.toHaveBeenCalled();
+    });
+  });
+
+  describe('Result Phase', () => {
+    it('should return tasks_result phase with correct session info', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTasksInstruction(
+        [{ description: 'Test', instruction: 'Test instruction' }],
+        'msg_parent',
+      );
+      const state = createInitialState({ operationId: 'test-op', stepCount: 5 });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        result: 'Done',
+        status: 'completed',
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(result.nextContext).toBeDefined();
+      const nextContext = result.nextContext as AgentRuntimeContext;
+      expect(nextContext.phase).toBe('tasks_batch_result');
+      expect(nextContext.session?.stepCount).toBe(6);
+      expect(nextContext.session?.status).toBe('running');
+
+      const payload = nextContext.payload as TasksBatchResultPayload;
+      expect(payload.parentMessageId).toBe('msg_parent');
+    });
+
+    it('should update messages in newState from store', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTasksInstruction();
+      const state = createInitialState({ messages: [], operationId: 'test-op' });
+
+      const updatedMessages = [{ content: 'test', id: 'msg_1', role: 'user' }];
+      mockStore.dbMessagesMap[context.messageKey] = updatedMessages as any;
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        result: 'Done',
+        status: 'completed',
+      });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(result.newState.messages).toEqual(updatedMessages);
+    });
+  });
+
+  describe('Task Message Creation', () => {
+    it('should create task message with correct parameters', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext({ agentId: 'agent_1', topicId: 'topic_1' });
+      const instruction = createExecTasksInstruction(
+        [{ description: 'Test task', instruction: 'Do something important' }],
+        'msg_parent',
+      );
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock).mockResolvedValueOnce({ id: 'task_msg_1' });
+
+      mockExecSubAgentTask.mockResolvedValueOnce({
+        assistantMessageId: 'asst_1',
+        operationId: 'op_1',
+        success: true,
+        threadId: 'thread_1',
+      });
+
+      mockGetSubAgentTaskStatus.mockResolvedValueOnce({
+        result: 'Done',
+        status: 'completed',
+      });
+
+      // When
+      await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      expect(mockStore.optimisticCreateMessage).toHaveBeenCalledWith(
+        {
+          agentId: 'agent_1',
+          content: '',
+          metadata: { instruction: 'Do something important' },
+          parentId: 'msg_parent',
+          role: 'task',
+          topicId: 'topic_1',
+        },
+        { operationId: 'test-op' },
+      );
+    });
+  });
+
+  describe('Mixed Results', () => {
+    it('should handle mix of successful and failed tasks', async () => {
+      // Given
+      const mockStore = createMockStore();
+      const context = createTestContext();
+      const instruction = createExecTasksInstruction(
+        [
+          { description: 'Task 1', instruction: 'Success task' },
+          { description: 'Task 2', instruction: 'Fail task' },
+        ],
+        'msg_parent',
+      );
+      const state = createInitialState({ operationId: 'test-op' });
+
+      (mockStore.optimisticCreateMessage as Mock)
+        .mockResolvedValueOnce({ id: 'task_msg_1' })
+        .mockResolvedValueOnce({ id: 'task_msg_2' });
+
+      mockExecSubAgentTask
+        .mockResolvedValueOnce({
+          assistantMessageId: 'asst_1',
+          operationId: 'op_1',
+          success: true,
+          threadId: 'thread_1',
+        })
+        .mockResolvedValueOnce({
+          assistantMessageId: 'asst_2',
+          operationId: 'op_2',
+          success: true,
+          threadId: 'thread_2',
+        });
+
+      mockGetSubAgentTaskStatus
+        .mockResolvedValueOnce({ result: 'Success', status: 'completed' })
+        .mockResolvedValueOnce({ error: 'Task failed', status: 'failed' });
+
+      // When
+      const result = await executeWithMockContext({
+        context,
+        executor: 'exec_tasks',
+        instruction,
+        mockStore,
+        state,
+      });
+
+      // Then
+      const payload = (result.nextContext as AgentRuntimeContext).payload as TasksBatchResultPayload;
+      expect(payload.results).toHaveLength(2);
+      expect(payload.results[0].success).toBe(true);
+      expect(payload.results[1].success).toBe(false);
+      expect(payload.results[1].error).toBe('Task failed');
+    });
+  });
+});
diff --git a/src/store/chat/agents/__tests__/createAgentExecutors/fixtures/mockInstructions.ts b/src/store/chat/agents/__tests__/createAgentExecutors/fixtures/mockInstructions.ts
index 05a0111d64..369a7c6ecc 100644
--- a/src/store/chat/agents/__tests__/createAgentExecutors/fixtures/mockInstructions.ts
+++ b/src/store/chat/agents/__tests__/createAgentExecutors/fixtures/mockInstructions.ts
@@ -2,6 +2,9 @@ import type {
   AgentInstruction,
   AgentInstructionCallLlm,
   AgentInstructionCallTool,
+  AgentInstructionExecTask,
+  AgentInstructionExecTasks,
+  ExecTaskItem,
   GeneralAgentCallLLMInstructionPayload,
   GeneralAgentCallingToolInstructionPayload,
 } from '@lobechat/agent-runtime';
@@ -124,3 +127,50 @@ export const createFinishInstruction = (
     type: 'finish',
   } as AgentInstruction;
 };
+
+/**
+ * Create a mock exec_task instruction (single task)
+ */
+export const createExecTaskInstruction = (
+  task?: Partial<ExecTaskItem>,
+  parentMessageId?: string,
+): AgentInstructionExecTask => {
+  const defaultTask: ExecTaskItem = {
+    description: 'Test task',
+    instruction: 'Execute test task',
+    ...task,
+  };
+
+  return {
+    payload: {
+      parentMessageId: parentMessageId || `msg_${nanoid()}`,
+      task: defaultTask,
+    },
+    type: 'exec_task',
+  };
+};
+
+/**
+ * Create a mock exec_tasks instruction (multiple tasks)
+ */
+export const createExecTasksInstruction = (
+  tasks: ExecTaskItem[] = [],
+  parentMessageId?: string,
+): AgentInstructionExecTasks => {
+  const defaultTasks: ExecTaskItem[] = tasks.length
+    ? tasks
+    : [
+        {
+          description: 'Test task',
+          instruction: 'Execute test task',
+        },
+      ];
+
+  return {
+    payload: {
+      parentMessageId: parentMessageId || `msg_${nanoid()}`,
+      tasks: defaultTasks,
+    },
+    type: 'exec_tasks',
+  };
+};
diff --git a/src/store/chat/agents/__tests__/createAgentExecutors/fixtures/mockStore.ts b/src/store/chat/agents/__tests__/createAgentExecutors/fixtures/mockStore.ts
index eb5ea293cf..204478f259 100644
--- a/src/store/chat/agents/__tests__/createAgentExecutors/fixtures/mockStore.ts
+++ b/src/store/chat/agents/__tests__/createAgentExecutors/fixtures/mockStore.ts
@@ -56,6 +56,8 @@ export const createMockStore = (overrides: Partial<ChatStore> = {}): ChatStore =
     }),
 
     // AI chat methods
+    internal_dispatchMessage: vi.fn(),
+
     internal_fetchAIChatMessage: vi.fn().mockResolvedValue(undefined),
 
     internal_invokeDifferentTypePlugin: vi.fn().mockResolvedValue({ error: null }),
diff --git a/src/store/chat/agents/createAgentExecutors.ts b/src/store/chat/agents/createAgentExecutors.ts
index e738c0da9f..73a662e7d8 100644
--- a/src/store/chat/agents/createAgentExecutors.ts
+++ b/src/store/chat/agents/createAgentExecutors.ts
@@ -3,12 +3,16 @@ import {
   type AgentInstruction,
   type AgentInstructionCallLlm,
   type AgentInstructionCallTool,
+  type AgentInstructionExecTask,
+  type AgentInstructionExecTasks,
   type AgentRuntimeContext,
   type GeneralAgentCallLLMInstructionPayload,
   type GeneralAgentCallLLMResultPayload,
   type GeneralAgentCallToolResultPayload,
   type GeneralAgentCallingToolInstructionPayload,
   type InstructionExecutor,
+  type TaskResultPayload,
+  type TasksBatchResultPayload,
   UsageCounter,
 } from '@lobechat/agent-runtime';
 import type { ChatToolPayload, CreateMessageParams } from '@lobechat/types';
@@ -16,7 +20,9 @@ import debug from 'debug';
 import pMap from 'p-map';
 
 import { LOADING_FLAT } from '@/const/message';
+import { aiAgentService } from '@/services/aiAgent';
 import type { ChatStore } from '@/store/chat/store';
+import { sleep } from '@/utils/sleep';
 
 const log = debug('lobe-store:agent-executors');
 
@@ -558,21 +564,58 @@ export const createAgentExecutors = (context: {
           toolCost.toFixed(4),
         );
 
-        // Check if tool wants to stop execution flow (e.g., group management tools)
+        // Check if tool wants to stop execution flow
         if (result?.stop) {
-          log(
-            '[%s][call_tool] Tool returned stop=true, terminating execution. state: %O',
-            sessionLogId,
-            result.state,
-          );
+          log('[%s][call_tool] Tool returned stop=true, state: %O', sessionLogId, result.state);
 
-          // Mark state as done and return without nextContext to stop the runtime
+          const stateType = result.state?.type;
+
+          // GTD async tasks need to be passed to Agent for exec_task/exec_tasks instruction
+          if (stateType === 'execTask' || stateType === 'execTasks') {
+            log(
+              '[%s][call_tool] Detected %s state, passing to Agent for decision',
+              sessionLogId,
+              stateType,
+            );
+
+            return {
+              events,
+              newState,
+              nextContext: {
+                payload: {
+                  data: result,
+                  executionTime,
+                  isSuccess,
+                  parentMessageId: toolMessageId,
+                  stop: true,
+                  toolCall: chatToolPayload,
+                  toolCallId: chatToolPayload.id,
+                } as GeneralAgentCallToolResultPayload,
+                phase: 'tool_result',
+                session: {
+                  eventCount: events.length,
+                  messageCount: newState.messages.length,
+                  sessionId: state.operationId,
+                  status: 'running',
+                  stepCount: state.stepCount + 1,
+                },
+                stepUsage: {
+                  cost: toolCost,
+                  toolName,
+                  unitPrice: toolCost,
+                  usageCount: 1,
+                },
+              } as AgentRuntimeContext,
+            };
+          }
+
+          // Other stop types (speak, delegate, broadcast, etc.) - stop execution immediately
           newState.status = 'done';
 
           return {
             events,
             newState,
-            nextContext: undefined, // No next context means execution stops
+            nextContext: undefined,
           };
         }
 
@@ -817,6 +860,625 @@ export const createAgentExecutors = (context: {
 
       return { events, newState };
     },
+
+    /**
+     * exec_task executor
+     * Executes a single async task
+     *
+     * Flow:
+     * 1. Create a task message (role: 'task') as placeholder
+     * 2. Call execSubAgentTask API (backend creates thread)
+     * 3. Poll for task completion
+     * 4. Update task message content with result on completion
+     * 5. Return task_result phase with result
+     */
+    exec_task: async (instruction, state) => {
+      const { parentMessageId, task } = (instruction as AgentInstructionExecTask).payload;
+
+      const events: AgentEvent[] = [];
+      const sessionLogId = `${state.operationId}:${state.stepCount}`;
+
+      log('[%s][exec_task] Starting execution of task: %s', sessionLogId, task.description);
+
+      // Get context from operation
+      const opContext = getOperationContext();
+      const { agentId, topicId } = opContext;
+
+      if (!agentId || !topicId) {
+        log('[%s][exec_task] No valid context, cannot execute task', sessionLogId);
+        return {
+          events,
+          newState: state,
+          nextContext: {
+            payload: {
+              parentMessageId,
+              result: {
+                error: 'No valid context available',
+                success: false,
+                taskMessageId: '',
+                threadId: '',
+              },
+            } as TaskResultPayload,
+            phase: 'task_result',
+            session: {
+              messageCount: state.messages.length,
+              sessionId: state.operationId,
+              status: 'running',
+              stepCount: state.stepCount + 1,
+            },
+          } as AgentRuntimeContext,
+        };
+      }
+
+
+
+      const taskLogId = `${sessionLogId}:task`;
+
+      try {
+        // 1. Create task message as placeholder
+        const taskMessageResult = await context.get().optimisticCreateMessage(
+          {
+            agentId,
+            content: '',
+            metadata: { instruction: task.instruction },
+            parentId: parentMessageId,
+            role: 'task',
+            topicId,
+          },
+          { operationId: state.operationId },
+        );
+
+        if (!taskMessageResult) {
+          log('[%s] Failed to create task message', taskLogId);
+          return {
+            events,
+            newState: state,
+            nextContext: {
+              payload: {
+                parentMessageId,
+                result: {
+                  error: 'Failed to create task message',
+                  success: false,
+                  taskMessageId: '',
+                  threadId: '',
+                },
+              } as TaskResultPayload,
+              phase: 'task_result',
+              session: {
+                messageCount: state.messages.length,
+                sessionId: state.operationId,
+                status: 'running',
+                stepCount: state.stepCount + 1,
+              },
+            } as AgentRuntimeContext,
+          };
+        }
+
+        const taskMessageId = taskMessageResult.id;
+        log('[%s] Created task message: %s', taskLogId, taskMessageId);
+
+        // 2. Create task via backend API
+        const createResult = await aiAgentService.execSubAgentTask({
+          agentId,
+          instruction: task.instruction,
+          parentMessageId: taskMessageId,
+          topicId,
+        });
+
+        if (!createResult.success) {
+          log('[%s] Failed to create task: %s', taskLogId, createResult.error);
+          await context
+            .get()
+            .optimisticUpdateMessageContent(
+              taskMessageId,
+              `Task creation failed: ${createResult.error}`,
+              undefined,
+              { operationId: state.operationId },
+            );
+          return {
+            events,
+            newState: state,
+            nextContext: {
+              payload: {
+                parentMessageId,
+                result: {
+                  error: createResult.error,
+                  success: false,
+                  taskMessageId,
+                  threadId: '',
+                },
+              } as TaskResultPayload,
+              phase: 'task_result',
+              session: {
+                messageCount: state.messages.length,
+                sessionId: state.operationId,
+                status: 'running',
+                stepCount: state.stepCount + 1,
+              },
+            } as AgentRuntimeContext,
+          };
+        }
+
+        log('[%s] Task created with threadId: %s', taskLogId, createResult.threadId);
+
+        // 3. Poll for task completion
+        const pollInterval = 3000; // 3 seconds
+        const maxWait = task.timeout || 1_800_000; // Default 30 minutes
+        const startTime = Date.now();
+
+        while (Date.now() - startTime < maxWait) {
+          // Check if operation has been cancelled
+          const currentOperation = context.get().operations[state.operationId];
+          if (currentOperation?.status === 'cancelled') {
+            log('[%s] Operation cancelled, stopping polling', taskLogId);
+            const updatedMessages = context.get().dbMessagesMap[context.messageKey] || [];
+            return {
+              events,
+              newState: { ...state, messages: updatedMessages },
+              nextContext: {
+                payload: {
+                  parentMessageId,
+                  result: {
+                    error: 'Operation cancelled',
+                    success: false,
+                    taskMessageId,
+                    threadId: createResult.threadId,
+                  },
+                } as TaskResultPayload,
+                phase: 'task_result',
+                session: {
+                  messageCount: updatedMessages.length,
+                  sessionId: state.operationId,
+                  status: 'running',
+                  stepCount: state.stepCount + 1,
+                },
+              } as AgentRuntimeContext,
+            };
+          }
+
+          const status = await aiAgentService.getSubAgentTaskStatus({
+            threadId: createResult.threadId,
+          });
+
+          // Update taskDetail in message if available
+          if (status.taskDetail) {
+            context.get().internal_dispatchMessage(
+              {
+                id: taskMessageId,
+                type: 'updateMessage',
+                value: { taskDetail: status.taskDetail },
+              },
+              { operationId: state.operationId },
+            );
+            log('[%s] Updated task message with taskDetail', taskLogId);
+          }
+
+          if (status.status === 'completed') {
+            log('[%s] Task completed successfully', taskLogId);
+            if (status.result) {
+              await context
+                .get()
+                .optimisticUpdateMessageContent(taskMessageId, status.result, undefined, {
+                  operationId: state.operationId,
+                });
+            }
+            const updatedMessages = context.get().dbMessagesMap[context.messageKey] || [];
+            return {
+              events,
+              newState: { ...state, messages: updatedMessages },
+              nextContext: {
+                payload: {
+                  parentMessageId,
+                  result: {
+                    result: status.result,
+                    success: true,
+                    taskMessageId,
+                    threadId: createResult.threadId,
+                  },
+                } as TaskResultPayload,
+                phase: 'task_result',
+                session: {
+                  messageCount: updatedMessages.length,
+                  sessionId: state.operationId,
+                  status: 'running',
+                  stepCount: state.stepCount + 1,
+                },
+              } as AgentRuntimeContext,
+            };
+          }
+
+          if (status.status === 'failed') {
+            log('[%s] Task failed: %s', taskLogId, status.error);
+            await context
+              .get()
+              .optimisticUpdateMessageContent(
+                taskMessageId,
+                `Task failed: ${status.error}`,
+                undefined,
+                { operationId: state.operationId },
+              );
+            const updatedMessages = context.get().dbMessagesMap[context.messageKey] || [];
+            return {
+              events,
+              newState: { ...state, messages: updatedMessages },
+              nextContext: {
+                payload: {
+                  parentMessageId,
+                  result: {
+                    error: status.error,
+                    success: false,
+                    taskMessageId,
+                    threadId: createResult.threadId,
+                  },
+                } as TaskResultPayload,
+                phase: 'task_result',
+                session: {
+                  messageCount: updatedMessages.length,
+                  sessionId: state.operationId,
+                  status: 'running',
+                  stepCount: state.stepCount + 1,
+                },
+              } as AgentRuntimeContext,
+            };
+          }
+
+          if (status.status === 'cancel') {
+            log('[%s] Task was cancelled', taskLogId);
+            await context
+              .get()
+              .optimisticUpdateMessageContent(taskMessageId, 'Task was cancelled', undefined, {
+                operationId: state.operationId,
+              });
+            const updatedMessages = context.get().dbMessagesMap[context.messageKey] || [];
+            return {
+              events,
+              newState: { ...state, messages: updatedMessages },
+              nextContext: {
+                payload: {
+                  parentMessageId,
+                  result: {
+                    error: 'Task was cancelled',
+                    success: false,
+                    taskMessageId,
+                    threadId: createResult.threadId,
+                  },
+                } as TaskResultPayload,
+                phase: 'task_result',
+                session: {
+                  messageCount: updatedMessages.length,
+                  sessionId: state.operationId,
+                  status: 'running',
+                  stepCount: state.stepCount + 1,
+                },
+              } as AgentRuntimeContext,
+            };
+          }
+
+          // Still processing, wait and poll again
+          await sleep(pollInterval);
+        }
+
+        // Timeout reached
+        log('[%s] Task timeout after %dms', taskLogId, maxWait);
+        await context
+          .get()
+          .optimisticUpdateMessageContent(
+            taskMessageId,
+            `Task timeout after ${maxWait}ms`,
+            undefined,
+            { operationId: state.operationId },
+          );
+
+        const updatedMessages = context.get().dbMessagesMap[context.messageKey] || [];
+        return {
+          events,
+          newState: { ...state, messages: updatedMessages },
+          nextContext: {
+            payload: {
+              parentMessageId,
+              result: {
+                error: `Task timeout after ${maxWait}ms`,
+                success: false,
+                taskMessageId,
+                threadId: createResult.threadId,
+              },
+            } as TaskResultPayload,
+            phase: 'task_result',
+            session: {
+              messageCount: updatedMessages.length,
+              sessionId: state.operationId,
+              status: 'running',
+              stepCount: state.stepCount + 1,
+            },
+          } as AgentRuntimeContext,
+        };
+      } catch (error) {
+        log('[%s] Error executing task: %O', taskLogId, error);
+        return {
+          events,
+          newState: state,
+          nextContext: {
+            payload: {
+              parentMessageId,
+              result: {
+                error: error instanceof Error ? error.message : 'Unknown error',
+                success: false,
+                taskMessageId: '',
+                threadId: '',
+              },
+            } as TaskResultPayload,
+            phase: 'task_result',
+            session: {
+              messageCount: state.messages.length,
+              sessionId: state.operationId,
+              status: 'running',
+              stepCount: state.stepCount + 1,
+            },
+          } as AgentRuntimeContext,
+        };
+      }
+    },
+
+    /**
+     * exec_tasks executor
+     * Executes one or more async tasks in parallel
+     *
+     * Flow:
+     * 1. For each task, create a task message (role: 'task') as placeholder
+     * 2. Call execSubAgentTask API (backend creates thread)
+     * 3. Poll for task completion
+     * 4. Update task message content with result on completion
+     * 5. Return tasks_batch_result phase with all results
+     */
+    exec_tasks: async (instruction, state) => {
+      const { parentMessageId, tasks } = (instruction as AgentInstructionExecTasks).payload;
+
+      const events: AgentEvent[] = [];
+      const sessionLogId = `${state.operationId}:${state.stepCount}`;
+
+      log('[%s][exec_tasks] Starting execution of %d tasks', sessionLogId, tasks.length);
+
+      // Get context from operation
+      const opContext = getOperationContext();
+      const { agentId, topicId } = opContext;
+
+      if (!agentId || !topicId) {
+        log('[%s][exec_tasks] No valid context, cannot execute tasks', sessionLogId);
+        return {
+          events,
+          newState: state,
+          nextContext: {
+            payload: {
+              parentMessageId,
+              results: tasks.map(() => ({
+                error: 'No valid context available',
+                success: false,
+                taskMessageId: '',
+                threadId: '',
+              })),
+            } as TasksBatchResultPayload,
+            phase: 'tasks_batch_result',
+            session: {
+              messageCount: state.messages.length,
+              sessionId: state.operationId,
+              status: 'running',
+              stepCount: state.stepCount + 1,
+            },
+          } as AgentRuntimeContext,
+        };
+      }
+
+      // Execute all tasks in parallel
+      const results = await pMap(
+        tasks,
+        async (task, taskIndex) => {
+          const taskLogId = `${sessionLogId}:task-${taskIndex}`;
+          log('[%s] Starting task: %s', taskLogId, task.description);
+
+          try {
+            // 1. Create task message as placeholder
+            const taskMessageResult = await context.get().optimisticCreateMessage(
+              {
+                agentId,
+                content: '',
+                metadata: { instruction: task.instruction },
+                parentId: parentMessageId,
+                role: 'task',
+                topicId,
+              },
+              { operationId: state.operationId },
+            );
+
+            if (!taskMessageResult) {
+              log('[%s] Failed to create task message', taskLogId);
+              return {
+                error: 'Failed to create task message',
+                success: false,
+                taskMessageId: '',
+                threadId: '',
+              };
+            }
+
+            const taskMessageId = taskMessageResult.id;
+            log('[%s] Created task message: %s', taskLogId, taskMessageId);
+
+            // 2. Create task via backend API (no groupId for single agent mode)
+            const createResult = await aiAgentService.execSubAgentTask({
+              agentId,
+              instruction: task.instruction,
+              parentMessageId: taskMessageId,
+              topicId,
+            });
+
+            if (!createResult.success) {
+              log('[%s] Failed to create task: %s', taskLogId, createResult.error);
+              // Update task message with error
+              await context
+                .get()
+                .optimisticUpdateMessageContent(
+                  taskMessageId,
+                  `Task creation failed: ${createResult.error}`,
+                  undefined,
+                  { operationId: state.operationId },
+                );
+              return {
+                error: createResult.error,
+                success: false,
+                taskMessageId,
+                threadId: '',
+              };
+            }
+
+            log('[%s] Task created with threadId: %s', taskLogId, createResult.threadId);
+
+            // 3. Poll for task completion
+            const pollInterval = 3000; // 3 seconds
+            const maxWait = task.timeout || 1_800_000; // Default 30 minutes
+            const startTime = Date.now();
+
+            while (Date.now() - startTime < maxWait) {
+              // Check if operation has been cancelled
+              const currentOperation = context.get().operations[state.operationId];
+              if (currentOperation?.status === 'cancelled') {
+                log('[%s] Operation cancelled, stopping polling', taskLogId);
+                return {
+                  error: 'Operation cancelled',
+                  success: false,
+                  taskMessageId,
+                  threadId: createResult.threadId,
+                };
+              }
+
+              const status = await aiAgentService.getSubAgentTaskStatus({
+                threadId: createResult.threadId,
+              });
+
+              // Update taskDetail in message if available
+              if (status.taskDetail) {
+                context.get().internal_dispatchMessage(
+                  {
+                    id: taskMessageId,
+                    type: 'updateMessage',
+                    value: { taskDetail: status.taskDetail },
+                  },
+                  { operationId: state.operationId },
+                );
+                log('[%s] Updated task message with taskDetail', taskLogId);
+              }
+
+              if (status.status === 'completed') {
+                log('[%s] Task completed successfully', taskLogId);
+                // 4. Update task message with result
+                if (status.result) {
+                  await context
+                    .get()
+                    .optimisticUpdateMessageContent(taskMessageId, status.result, undefined, {
+                      operationId: state.operationId,
+                    });
+                }
+                return {
+                  result: status.result,
+                  success: true,
+                  taskMessageId,
+                  threadId: createResult.threadId,
+                };
+              }
+
+              if (status.status === 'failed') {
+                log('[%s] Task failed: %s', taskLogId, status.error);
+                // Update task message with error
+                await context
+                  .get()
+                  .optimisticUpdateMessageContent(
+                    taskMessageId,
+                    `Task failed: ${status.error}`,
+                    undefined,
+                    { operationId: state.operationId },
+                  );
+                return {
+                  error: status.error,
+                  success: false,
+                  taskMessageId,
+                  threadId: createResult.threadId,
+                };
+              }
+
+              if (status.status === 'cancel') {
+                log('[%s] Task was cancelled', taskLogId);
+                // Update task message with cancelled status
+                await context
+                  .get()
+                  .optimisticUpdateMessageContent(taskMessageId, 'Task was cancelled', undefined, {
+                    operationId: state.operationId,
+                  });
+                return {
+                  error: 'Task was cancelled',
+                  success: false,
+                  taskMessageId,
+                  threadId: createResult.threadId,
+                };
+              }
+
+              // Still processing, wait and poll again
+              await sleep(pollInterval);
+            }
+
+            // Timeout reached
+            log('[%s] Task timeout after %dms', taskLogId, maxWait);
+            // Update task message with timeout error
+            await context
+              .get()
+              .optimisticUpdateMessageContent(
+                taskMessageId,
+                `Task timeout after ${maxWait}ms`,
+                undefined,
+                { operationId: state.operationId },
+              );
+
+            return {
+              error: `Task timeout after ${maxWait}ms`,
+              success: false,
+              taskMessageId,
+              threadId: createResult.threadId,
+            };
+          } catch (error) {
+            log('[%s] Error executing task: %O', taskLogId, error);
+            return {
+              error: error instanceof Error ? error.message : 'Unknown error',
+              success: false,
+              taskMessageId: '',
+              threadId: '',
+            };
+          }
+        },
+        { concurrency: 5 }, // Limit concurrent tasks
+      );
+
+      log('[%s][exec_tasks] All tasks completed, results: %O', sessionLogId, results);
+
+      // Get latest messages from store
+      const updatedMessages = context.get().dbMessagesMap[context.messageKey] || [];
+      const newState = { ...state, messages: updatedMessages };
+
+      // Return tasks_batch_result phase
+      return {
+        events,
+        newState,
+        nextContext: {
+          payload: {
+            parentMessageId,
+            results,
+          } as TasksBatchResultPayload,
+          phase: 'tasks_batch_result',
+          session: {
+            messageCount: newState.messages.length,
+            sessionId: state.operationId,
+            status: 'running',
+            stepCount: state.stepCount + 1,
+          },
+        } as AgentRuntimeContext,
+      };
+    },
   };
 
   return executors;
diff --git a/src/store/chat/slices/plugin/actions/pluginTypes.ts b/src/store/chat/slices/plugin/actions/pluginTypes.ts
index 3a6aa0f97d..b211883cd9 100644
--- a/src/store/chat/slices/plugin/actions/pluginTypes.ts
+++ b/src/store/chat/slices/plugin/actions/pluginTypes.ts
@@ -78,12 +78,13 @@ export interface PluginTypesAction {
    * @param id - Tool message ID
    * @param payload - Tool call payload
    * @param stepContext - Optional step context with dynamic state like GTD todos
+   * @returns The tool execution result (including stop flag for flow control)
    */
   invokeBuiltinTool: (
     id: string,
     payload: ChatToolPayload,
     stepContext?: RuntimeStepContext,
-  ) => Promise<void>;
+  ) => Promise<any>;
 
   /**
    * Invoke Cloud Code Interpreter tool
diff --git a/src/tools/streamings.ts b/src/tools/streamings.ts
index 35fbedefc6..2ad783eaf8 100644
--- a/src/tools/streamings.ts
+++ b/src/tools/streamings.ts
@@ -1,3 +1,4 @@
+import { GTDManifest, GTDStreamings } from '@lobechat/builtin-tool-gtd/client';
 import { LocalSystemManifest } from '@lobechat/builtin-tool-local-system';
 import { type BuiltinStreaming } from '@lobechat/types';
 
@@ -15,6 +16,7 @@ import { LocalSystemStreamings } from './local-system/Streaming';
  */
 const BuiltinToolStreamings: Record<string, Record<string, BuiltinStreaming>> = {
   [CodeInterpreterIdentifier]: CodeInterpreterStreamings as Record<string, BuiltinStreaming>,
+  [GTDManifest.identifier]: GTDStreamings as Record<string, BuiltinStreaming>,
   [LocalSystemManifest.identifier]: LocalSystemStreamings as Record<string, BuiltinStreaming>,
 };
 
diff --git a/vitest.config.mts b/vitest.config.mts
index 81e6770674..3ca64e0692 100644
--- a/vitest.config.mts
+++ b/vitest.config.mts
@@ -48,6 +48,7 @@ export default defineConfig({
       '@/utils/errorResponse': resolve(__dirname, './src/utils/errorResponse'),
       '@/utils/unzipFile': resolve(__dirname, './src/utils/unzipFile'),
       '@/utils/server': resolve(__dirname, './src/utils/server'),
+      '@/utils/identifier': resolve(__dirname, './src/utils/identifier'),
       '@/utils/electron': resolve(__dirname, './src/utils/electron'),
       '@/utils/identifier': resolve(__dirname, './src/utils/identifier'),
       '@/utils': resolve(__dirname, './packages/utils/src'),