Update app.py

app.py

@@ -37,7 +37,9 @@ def get_current_time_in_timezone(timezone: str) -> str:
 
 @tool
 def visit_webpage(url: str) -> str:
-    """Fetches raw HTML content of a web page."""
+    """Fetches raw HTML content of a web page.
+    Args:
+        url: The url of the webpage"""
     try:
         response = requests.get(url, timeout=5)
         return response.text[:5000]  # limit output length