Update app.py

app.py

@@ -35,7 +35,10 @@ def get_current_time_in_timezone(timezone: str) -> str:
 
 @tool
 def fetch_news(topic: str) -> str:
-    """A tool that fetches news articles based on a given topic."""
+    """A tool that fetches news articles based on a given topic.
+    Args:
+        topic: A string with the key to be searched for.
+    """
     search_url = f"https://news.google.com/search?q={topic}"
     headers = {'User-Agent': 'Mozilla/5.0'}
     response = requests.get(search_url, headers=headers)