导入方式修改

backend/app/subgraphs/contact/api_client.py

@@ -20,22 +20,18 @@ class ContactAPIClient:
     
     def __init__(self, conn=None):
         """
-        初始化
-        
+        初始化（使用延迟初始化，MCP在首次使用时初始化）
+
         Args:
             conn: 数据库连接（保留用于向后兼容）
         """
         self.conn = conn
-        
-        # 确保MCP已初始化
-        import asyncio
-        try:
-            asyncio.create_task(self._init_mcp())
-        except RuntimeError:
-            pass  # 没有事件循环时跳过，延迟初始化
+        self._mcp_initialized = False  # 延迟初始化标志
     
     async def _init_mcp(self):
-        """初始化MCP系统"""
+        """初始化MCP系统（延迟初始化）"""
+        if self._mcp_initialized:
+            return  # 已初始化，跳过
         if not mcp_manager.get_adapter("contact"):
             # 获取repository（如果有）
             repo = None
@@ -45,9 +41,10 @@ class ContactAPIClient:
                     repo = ContactRepository(self.conn)
                 except Exception:
                     pass
-            
+
             mcp_manager.register_adapter(ContactAdapter(contact_repo=repo))
             await mcp_manager.initialize()
+        self._mcp_initialized = True
     
     async def list_contacts(self, user_id: str = "default") -> List[Contact]:
         """获取联系人列表"""

backend/app/subgraphs/contact/nodes.py

@@ -8,7 +8,7 @@ from typing import Dict, Any
 from datetime import datetime
 
 # 公共工具
-from app.core import MarkdownFormatter
+from ...core import MarkdownFormatter
 
 from .state import ContactState
 from .api_client import ContactAPIClient