Update app.py

app.py

@@ -23,8 +23,9 @@ def get_weather(city:str) -> str:
 
 @tool
 def weather_tool(city:str) -> str:
-    """
-    Returns the weather of a city
+    """Returns the weather of city
+    Args:
+        city: the city we want to evaluate the weather in
     """
     return getweather(city)