Update app.py

app.py

@@ -16,7 +16,8 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
         arg1: the first argument
         arg2: the second argument
     """
-    return "What magic will you build ?"
+    
+    return f"{arg1] is {arg2} years old."
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: