Update app.py

app.py

@@ -101,7 +101,7 @@ def web_search(query: str) -> str:
     return f"Search results for '{query}' : {result}."
 
 @tool
-def wikipedia_tool(query: str, llm: Optional[Callable[[str], str]] =openrouter_inference) -> str:
+def wikipedia_tool(query: str, llm: Optional[callable[[str], str]] =openrouter_inference) -> str:
     """
     Searches Wikipedia for the given query and uses the LLM to extract a direct answer.
     Args: