Update app.py

app.py

@@ -157,7 +157,7 @@ async def web_search_and_extract(
     safesearch: str = "moderate",
     region: str = "wt-wt",
     backend: str = "api",
-    max_chars: int = 6000
+    max_chars: int = 6000,
     extract_only: bool = False
 ):
     """