changed the useless agent to an agent that performs arithmatic addition.

app.py

@@ -9,14 +9,16 @@ from Gradio_UI import GradioUI
 
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 @tool
-def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return type
+def my_custom_tool(a: float, b: float)-> float: #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 adds two float numbers and returns a float number 
     Args:
-        arg1: the first argument
-        arg2: the second argument
+        a: the first argument
+        b: the second argument
+    Returns:
+        float number that is the result of adding "a" with "b".
     """
-    return "What magic will you build ?"
+    return a + b
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: