Update app.py

Updated the custom tool

app.py

@@ -11,12 +11,12 @@ from Gradio_UI import GradioUI
 @tool
 def my_custom_tool(arg1:str, arg2:int)-> str: #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 does nothing yet 
+    """A tool that counts the number of a particular letter in a word' 
     Args:
-        arg1: the first argument
-        arg2: the second argument
+        arg1: The word passed to this tool to have its letters counted'
+        arg2: The letter to check for
     """
-    return "What magic will you build ?"
+    return "The number of letter {arg1} in the word {arg2} is ANSWER !"
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: