Update app.py

app.py

@@ -102,7 +102,15 @@ def web_search(query: str) -> str:
 
 @tool
 def wikipedia_tool(query: str) -> str:
-    """Search Wikipedia for a query and return up to 2 results as formatted text."""
+    """
+    Searches Wikipedia for the given query and returns a summary.
+
+    Args:
+        query (str): The search term or question to look up on Wikipedia.
+
+    Returns:
+        str: A summary or error message.
+    """
     try:
         search_docs = WikipediaLoader(query=query, load_max_docs=2).load()
         formatted_search_docs = "\n\n---\n\n".join(