Update app.py

app.py

@@ -19,9 +19,10 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     return "What magic will you build ?"
 
 @tool
-def get_city_weather(city:str)-> str: #it's import to specify the return type
-    """ A tool to Fetch weather of a given arg city
-    Args: 
+def get_city_weather(city: str)-> str: #it's import to specify the return type
+    """ 
+    A tool to Fetch current weather of a given city
+    Args:
         city: city name as string (e.g., 'London').        
     """
     if not city or city.strip() == "":