refining code

app.py

@@ -9,12 +9,12 @@ from Gradio_UI import GradioUI
 
 # Below is an example of a tool that does nothing. Amaze us with your creativity !
 @tool
-def addition(a:str, b:int)-> str: #it's import to specify the return type
+def addition(a:int, b: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 sum two integer value 
     Args:
         a: the first integer argument
-        a: the second integer argument
+        b: the second integer argument
     """
     return f"The sum of a and b is {a + b}"