forgot to add decorator

app.py

@@ -18,6 +18,7 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     """
     return "What magic will you build ?"
 
+@tool
 def r_counter(arg1:str)-> int: #it's import to specify the return type
     #Keep this format for the description / args / args description but feel free to modify the tool
     """A tool that counts the number of r's in a string