feat: 子代理继承主代理的 MCP 工具

- 为 McpToolWrapper 添加 Clone trait，支持工具实例复用
- 修改 build_subagent_tools 方法，支持传入 MCP 工具列表
- 调整 runtime 构建顺序：先等待 MCP 连接，再将 MCP 工具传递给子代理

子代理现在可以自动使用主代理配置的 MCP 工具（如 filesystem、fetch 等）。

src/gateway/runtime.rs

@@ -124,10 +124,51 @@ pub(crate) fn build_session_manager_with_sender(
         factory
     };
 
+    // Wait for MCP connections and collect MCP tools for subagents
+    // This needs to happen before building subagent tools
+    let mut mcp_tools_for_subagents: Vec<crate::mcp::tool_adapter::McpToolWrapper> = Vec::new();
+    if mcp_initializer.is_enabled() {
+        tokio::task::block_in_place(|| {
+            tokio::runtime::Handle::current().block_on(async {
+                // Wait for connections to complete
+                if let Err(e) = mcp_initializer.wait_for_connections().await {
+                    tracing::error!(error = %e, "Failed to wait for MCP connections");
+                    return;
+                }
+
+                // Collect MCP tools for subagents
+                if let Some(manager) = mcp_initializer.manager() {
+                    let all_tools = manager.all_tools().await;
+                    for (server_key, tool_info) in all_tools {
+                        let wrapper = crate::mcp::tool_adapter::McpToolWrapper::new(
+                            manager.clone(),
+                            server_key.clone(),
+                            tool_info,
+                        );
+                        mcp_tools_for_subagents.push(wrapper);
+                    }
+                    tracing::info!(
+                        tool_count = mcp_tools_for_subagents.len(),
+                        "Collected MCP tools for subagents"
+                    );
+                }
+            })
+        });
+    }
+
     // Create SubAgentRuntime (if task tool is enabled)
     let (factory, task_repository): (_, Arc<dyn TaskRepository>) = if task_config.enabled {
         let task_repository = Arc::new(InMemoryTaskRepository::new());
-        let subagent_tools = Arc::new(factory.build_subagent_tools());
+        // Build subagent tools with MCP tools
+        let subagent_tools = Arc::new(
+            factory.build_subagent_tools(
+                if mcp_tools_for_subagents.is_empty() {
+                    None
+                } else {
+                    Some(mcp_tools_for_subagents.clone())
+                }
+            )
+        );
 
         // Create subagent catalog with discovery
         let catalog = Arc::new(SubagentCatalog::discover(&subagents_config));
@@ -157,14 +198,16 @@ pub(crate) fn build_session_manager_with_sender(
     // Build base tools
     let mut tools = factory.build();
 
-    // Register MCP tools (async)
-    // This waits briefly for connections, then registers available tools
+    // Register MCP tools to main agent (async)
+    // Note: MCP tools for subagents are already collected above
     if mcp_initializer.is_enabled() {
         tokio::task::block_in_place(|| {
             tokio::runtime::Handle::current().block_on(async {
-                if let Err(e) = mcp_initializer.register_tools(&mut tools).await {
-                    tracing::error!(error = %e, "Failed to register MCP tools");
+                // Register pre-collected MCP tools
+                for tool in mcp_tools_for_subagents {
+                    tools.register(tool);
                 }
+                tracing::info!("Registered MCP tools to main agent");
             })
         });
     }

src/gateway/tool_registry_factory.rs

@@ -142,7 +142,11 @@ impl ToolRegistryFactory {
     }
 
     /// 构建子代理专用工具集（不包含 task 工具防止递归）
-    pub(crate) fn build_subagent_tools(&self) -> ToolRegistry {
+    /// 可选地包含 MCP 工具（通过 mcp_tools 参数传递）
+    pub(crate) fn build_subagent_tools(
+        &self,
+        mcp_tools: Option<Vec<crate::mcp::tool_adapter::McpToolWrapper>>,
+    ) -> ToolRegistry {
         let mut registry = ToolRegistry::new();
 
         // 基础工具
@@ -194,6 +198,13 @@ impl ToolRegistryFactory {
             registry.register(SessionSendTool::new(self.session_message_sender.clone()));
         }
 
+        // 注册 MCP 工具（如果提供）
+        if let Some(mcp_tools) = mcp_tools {
+            for tool in mcp_tools {
+                registry.register(tool);
+            }
+        }
+
         // 注意：不注册 task 工具，防止递归创建子代理
 
         registry

src/mcp/tool_adapter.rs

@@ -9,6 +9,7 @@ use crate::mcp::client::McpClientManager;
 use crate::tools::traits::{Tool as PicoBotTool, ToolResult};
 
 /// Wrapper that adapts an MCP tool to PicoBot's Tool trait
+#[derive(Clone)]
 pub struct McpToolWrapper {
     /// The MCP client manager
     manager: Arc<McpClientManager>,