Update app.py

app.py

@@ -13,7 +13,7 @@ def calculator_tool(expression: str)-> str: # Returns a string result
     """
     A tool that evaluates a mathematical expression using the Wolfram Alpha API.
     Args:
-        expression (str): A mathematical expression to evaluate (e.g., "1+2", "3*5").
+        expression: A string of the mathematical expression to evaluate (e.g., "1+2", "3*5").
     """
     try:
         # app_id = "replace_with_your_Wolfram_ID"  # Your Wolfram Alpha App ID