Update app.py

app.py

@@ -11,7 +11,14 @@ _ddg = DuckDuckGoSearchTool()
 
 @tool
 def web_search(query: str) -> str:
-    """Search the web using DuckDuckGo and return the results."""
+"""Search the web using DuckDuckGo and return results.
+
+    Args:
+        query: The search query string.
+
+    Returns:
+        A text representation of the search results.
+    """
     return _ddg(query)
 
 # Below is an example of a tool that does nothing. Amaze us with your creativity !