updated the arguments of currency converter to the recommended format

app.py

@@ -21,17 +21,13 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
 
 @tool
 def convert_currency(amount:float, from_currency:float, to_currency:float)-> float:
+    """ A tool that converts a specified amount from one currency to another.
+    Args:
+        amount (float): The amount of money to convert (e.g. 10.5)
+        from_currency (str): The currency code of the source currency (e.g., 'USD').
+        to_currency (str): The currency code of the target currency (e.g., 'EUR').
     """
-    Convert the specified amount from one currency to another.
-
-    Parameters:
-    - amount (float): The amount of money to convert.
-    - from_currency (str): The currency code of the source currency (e.g., 'USD').
-    - to_currency (str): The currency code of the target currency (e.g., 'EUR').
-
-    Returns:
-    - float: The converted amount in the target currency.
-    """
+    
     # Initialize the CurrencyRates object
     c = CurrencyRates()