fix: improve maintenance and synchronize live conversations

backend/app/api/mcp_tool.py

@@ -19,7 +19,7 @@ from typing import List
 from app.core.logger import get_logger
 from app.database import get_db
 from app.models.user import User
-from app.core.auth import get_current_user, require_permissions
+from app.core.auth import require_permissions
 from app.repositories.mcp_tool import MCPToolRepository
 from app.repositories.agent import AgentRepository