diff --git a/qwen_agent/tools/mcp_manager.py b/qwen_agent/tools/mcp_manager.py
index 9920978f..fcd0cf6c 100644
--- a/qwen_agent/tools/mcp_manager.py
+++ b/qwen_agent/tools/mcp_manager.py
@@ -30,10 +30,12 @@
 
 class MCPManager:
     _instance = None  # Private class variable to store the unique instance
+    _lock = threading.Lock()  # Lock to ensure thread-safe singleton creation
 
     def __new__(cls, *args, **kwargs):
-        if cls._instance is None:
-            cls._instance = super(MCPManager, cls).__new__(cls, *args, **kwargs)
+        with cls._lock:
+            if cls._instance is None:
+                cls._instance = super(MCPManager, cls).__new__(cls, *args, **kwargs)
         return cls._instance
 
     def __init__(self):