Update app.py

app.py

@@ -21,7 +21,7 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     return "What magic will you build ?"
 
 @tool
-def todays_date():
+def todays_date() -> str:
     """ Returns the current date in the format of 'Month Day, Year' 
     
     Returns: