Update app.py

app.py

@@ -21,7 +21,7 @@ Args:
     #return "What magic will you build ?"
 
 @tool 
-def my_custom_tool(currency_name: str, currency_value: Union[int, float], target_currency: str) -> float:
+def my_custom_tool(currency_name: str, currency_value: float, target_currency: str) -> float:
     """A tool that converts an amount from one currency to another using current exchange rates.
     
     Args: