diff --git a/dbgpt/agent/agents/base_agent.py b/dbgpt/agent/agents/base_agent.py
index b1d238acd..c634acba7 100644
--- a/dbgpt/agent/agents/base_agent.py
+++ b/dbgpt/agent/agents/base_agent.py
@@ -664,7 +664,7 @@ def _select_llm_model(self, old_model: str = None):
         return now_model.model
 
     async def a_reasoning_reply(
-        self, messages: Union[List[Dict]]
+        self, messages: Optional[List[Dict]] = None
     ) -> Union[str, Dict, None]:
         """(async) Reply based on the conversation history and the sender.
         Args: