src/config/mod.rs

@@ -221,8 +221,6 @@ pub struct TaskConfig {
     pub ttl_hours: u64,
     #[serde(default = "default_task_allowed_tools")]
     pub allowed_tools: Vec<String>,
-    #[serde(default = "default_task_max_nesting_depth")]
-    pub max_nesting_depth: u32,
 }
 
 fn default_task_enabled() -> bool {
@@ -241,10 +239,6 @@ fn default_task_ttl_hours() -> u64 {
     24
 }
 
-fn default_task_max_nesting_depth() -> u32 {
-    1
-}
-
 fn default_task_allowed_tools() -> Vec<String> {
     vec![
         "read".to_string(),
@@ -270,7 +264,6 @@ impl Default for TaskConfig {
             explore_max_execution_secs: default_task_explore_max_execution_secs(),
             ttl_hours: default_task_ttl_hours(),
             allowed_tools: default_task_allowed_tools(),
-            max_nesting_depth: default_task_max_nesting_depth(),
         }
     }
 }

src/gateway/agent_factory.rs

@@ -79,7 +79,6 @@ impl AgentFactory {
                 message_id: request.message_id.map(str::to_string),
                 message_seq: None,
                 subagent_description: None,
-                nesting_depth: 0,
             });
             // 如果有取消信号接收端，注入 Agent
             if let Some(token) = request.cancel_token {

src/gateway/runtime.rs

@@ -193,7 +193,6 @@ pub(crate) fn build_session_manager_with_sender(
             explore_max_execution_secs: task_config.explore_max_execution_secs,
             ttl_hours: task_config.ttl_hours,
             skills_index: skills.system_index_prompt(),
-            max_nesting_depth: task_config.max_nesting_depth,
         };
 
         let subagent_runtime = Arc::new(DefaultSubAgentRuntime::new(

src/gateway/tool_registry_factory.rs

@@ -243,15 +243,7 @@ impl ToolRegistryFactory {
             }
         }
 
-        // 注册 task 工具，允许子代理创建孙代理（深度由 TaskTool 运行时控制）
+        // 注意：不注册 task 工具，防止递归创建子代理
-        if self.is_enabled("task") && self.task_config.enabled {
-            if let Some(runtime) = &self.subagent_runtime {
-                registry.register(TaskTool::new_with_depth(
-                    runtime.clone(),
-                    self.task_config.max_nesting_depth,
-                ));
-            }
-        }
 
         registry
     }

src/tools/task/runtime.rs

@@ -34,8 +34,6 @@ pub struct SubAgentRuntimeConfig {
     pub ttl_hours: u64,
     /// 技能索引（可选，预生成的技能列表字符串）
     pub skills_index: Option<String>,
-    /// 子代理最大嵌套深度（0 = 禁止嵌套，1 = 允许 1 层孙代理）
-    pub max_nesting_depth: u32,
 }
 
 impl Default for SubAgentRuntimeConfig {
@@ -59,7 +57,6 @@ impl Default for SubAgentRuntimeConfig {
             explore_max_execution_secs: 3600, // 60分钟
             ttl_hours: 24,
             skills_index: None,
-            max_nesting_depth: 1,
         }
     }
 }
@@ -326,7 +323,6 @@ impl DefaultSubAgentRuntime {
         &self,
         session: &TaskSession,
         system_prompt: String,
-        parent_nesting_depth: u32,
     ) -> Result<AgentLoop, TaskError> {
         let prompt_provider = Arc::new(StaticSystemPromptProvider::new(system_prompt));
 
@@ -346,7 +342,6 @@ impl DefaultSubAgentRuntime {
                 message_id: None,
                 message_seq: None,
                 subagent_description: Some(session.description.clone()),
-                nesting_depth: parent_nesting_depth + 1,
             });
 
             // 如果有 MessageBus，附加实时广播 emitter
@@ -566,7 +561,7 @@ impl SubAgentRuntime for DefaultSubAgentRuntime {
         );
 
         // 7. 创建子代理
-        let agent = self.create_subagent(&session, system_prompt, parent_context.nesting_depth)?;
+        let agent = self.create_subagent(&session, system_prompt)?;
 
         // 8. 执行任务
         let result = self
@@ -647,7 +642,7 @@ impl SubAgentRuntime for DefaultSubAgentRuntime {
         );
 
         // 5. 创建子代理
-        let agent = self.create_subagent(&session, system_prompt, parent_context.nesting_depth)?;
+        let agent = self.create_subagent(&session, system_prompt)?;
 
         // 6. 使用历史继续执行
         let result = self

src/tools/task/tool.rs

@@ -10,24 +10,11 @@ use super::types::{TaskDefinition, TaskToolArgs};
 /// Task 工具 - 创建和管理子代理
 pub struct TaskTool {
     runtime: Arc<dyn SubAgentRuntime>,
-    /// 最大嵌套深度（0 = 主 agent 不允许创建子代理，1 = 子 agent 可创建 1 层孙 agent）
-    max_nesting_depth: u32,
 }
 
 impl TaskTool {
     pub fn new(runtime: Arc<dyn SubAgentRuntime>) -> Self {
-        Self {
+        Self { runtime }
-            runtime,
-            max_nesting_depth: 0, // 主 agent 无深度限制
-        }
-    }
-
-    /// 创建带嵌套深度限制的 TaskTool（用于子代理）
-    pub fn new_with_depth(runtime: Arc<dyn SubAgentRuntime>, max_nesting_depth: u32) -> Self {
-        Self {
-            runtime,
-            max_nesting_depth,
-        }
     }
 }
 
@@ -139,19 +126,7 @@ impl Tool for TaskTool {
             });
         }
 
-        // 4. 深度校验（仅对嵌套场景生效，主 agent 的 max_nesting_depth = 0 不限制）
+        // 4. 执行任务
-        if self.max_nesting_depth > 0 && context.nesting_depth >= self.max_nesting_depth {
-            return Ok(ToolResult {
-                success: false,
-                output: String::new(),
-                error: Some(format!(
-                    "Cannot create nested subagent: max nesting depth ({}) reached",
-                    self.max_nesting_depth
-                )),
-            });
-        }
-
-        // 5. 执行任务
         let result = if let Some(task_id) = task_args.task_id {
             // 恢复现有任务
             self.runtime

src/tools/todo_read.rs

@@ -182,7 +182,6 @@ mod tests {
             message_id: Some("msg-1".to_string()),
             message_seq: Some(1),
             subagent_description: None,
-            nesting_depth: 0,
         }
     }
 

src/tools/todo_write.rs

@@ -402,7 +402,6 @@ mod tests {
             message_id: Some("msg-1".to_string()),
             message_seq: Some(1),
             subagent_description: None,
-            nesting_depth: 0,
         }
     }
 

src/tools/traits.rs

@@ -18,8 +18,6 @@ pub struct ToolContext {
     pub message_seq: Option<i64>,
     /// 子代理标识，用于标注消息来源
     pub subagent_description: Option<String>,
-    /// 当前嵌套深度（0 = 主 agent，1 = 子 agent，2 = 孙 agent...）
-    pub nesting_depth: u32,
 }
 
 #[async_trait]

web/src/App.tsx

@@ -75,7 +75,6 @@ function App() {
     handleCommand,
     clearMessages,
     handleServerMessage,
-    setSendMessage,
     selectTopic,
     createTopic,
     switchTopic,
@@ -93,11 +92,6 @@ function App() {
     onMessage: handleServerMessage,
   })
 
-  // 将 sendMessage 注入到 useChat，供 handleServerMessage 内部发送命令
-  useEffect(() => {
-    setSendMessage(sendMessage)
-  }, [setSendMessage, sendMessage])
-
   // ---- 主题状态 ----
 
   const [memoryPanelOpen, setMemoryPanelOpen] = useState(() => {

web/src/hooks/useChat.ts

@@ -29,7 +29,6 @@ import type {
   ChannelList,
   StreamDelta,
   StreamEnd,
-  WsInbound,
 } from '../types/protocol'
 
 // 简化后的层级状态
@@ -67,7 +66,6 @@ interface UseChatReturn {
   handleCommand: (command: Command) => void
   clearMessages: () => void
   handleServerMessage: (message: WsOutbound) => void
-  setSendMessage: (fn: (msg: WsInbound) => boolean) => void
 
   // Topic 方法
   selectTopic: (topicId: string) => void
@@ -173,12 +171,6 @@ export function useChat(): UseChatReturn {
   const selectedTopicRef = useRef<string | null>(null)
   const pendingNewTopicRef = useRef(false)
 
-  // Ref to send commands from within handleServerMessage (set by App.tsx)
-  const sendMessageRef = useRef<((msg: WsInbound) => boolean) | null>(null)
-  const setSendMessage = useCallback((fn: (msg: WsInbound) => boolean) => {
-    sendMessageRef.current = fn
-  }, [])
-
   const isConnected = useMemo(() => connectionId !== null, [connectionId])
   const selectedSession = useMemo(
     () => sessions.find(s => s.session_id === selectedSessionId) ?? null,
@@ -385,11 +377,6 @@ export function useChat(): UseChatReturn {
       const msgSubagentTaskId = getSubagentTaskId(message)
       if (msgSubagentTaskId && msgSubagentTaskId === currentSubAgentView.taskId) {
         appendToSubAgentViewMessage(message)
-        // 子代理 todo_write 完成后自动刷新待办列表
-        if (message.type === 'tool_result' && (message as ToolResult).tool_name === 'todo_write') {
-          const refreshCmd = requestSubAgentTodoList(currentSubAgentView.taskId)
-          sendMessageRef.current?.({ type: 'command', payload: JSON.stringify(refreshCmd) })
-        }
         return
       }
       // 丢弃其他子智能体的消息，避免 fall through 到主消息处理
@@ -707,14 +694,6 @@ export function useChat(): UseChatReturn {
         // 忽略这些消息
         break
     }
-
-    // 主视图 todo_write 完成后自动刷新待办列表
-    if (message.type === 'tool_result' && (message as ToolResult).tool_name === 'todo_write') {
-      const refreshCmd = subAgentViewRef.current?.taskId
-        ? requestSubAgentTodoList(subAgentViewRef.current.taskId)
-        : requestTodoList()
-      sendMessageRef.current?.({ type: 'command', payload: JSON.stringify(refreshCmd) })
-    }
   }, [])
 
   const handleMessage = useCallback((content: string, attachments?: Attachment[]) => {
@@ -959,7 +938,6 @@ export function useChat(): UseChatReturn {
     handleCommand,
     clearMessages,
     handleServerMessage,
-    setSendMessage,
     selectTopic,
     createTopic,
     switchTopic,