updated sampel 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 fetches the distance between two cities
     Args:
-        arg1: the first argument
-        arg2: the second argument
+        arg1: A string representing a valid city
+        arg2: A string representing a valid city
     """
-    return "What magic will you build ?"
+    return [arg1, arg2]
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: