Update app.py

app.py

@@ -20,13 +20,11 @@ def my_custom_tool(expr:str)-> str: #it's import to specify the return type
         res = eval(arg1)
     
     except SyntaxError as se:
-        raise SystemError
-            (f"Error: Invalid Syntax in the expression {se}") from se
+        return f"Error: Invalid Syntax in the expression: {str(se)}"
     except Exception as e:
-        raise Exception
-            ("Error: evaluatiopn failed with error {e}") from e
+        return f"Error: evaluatiopn failed with error {str(e)}"
         
-    return str(res)
+    return f"{expr} evaluates to {str(res)}"
 
 @tool
 def get_current_time_in_timezone(timezone: str) -> str: