Update app.py

app.py

@@ -17,7 +17,8 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
         arg2: the second argument
     """
     return "What magic will you build ?"
-
+    
+@tool
 def magic_echo(arg1: str, arg2: int) -> str:
     """A tool that creates a magical echo effect.