Update app.py

app.py

@@ -12,8 +12,12 @@ from Gradio_UI import GradioUI
 def calculator_tool(expression: str)-> str: # Returns a string result
     """
     A tool that evaluates a mathematical expression using the Wolfram Alpha API.
+    
     Args:
         expression: A string of the mathematical expression to evaluate (e.g., "1+2", "3*5").
+        
+    Returns:
+        str: The result of the calculation or an error message if the request fails.
     """
     try:
         # app_id = "replace_with_your_Wolfram_ID"  # Your Wolfram Alpha App ID