added current currency rate converter tool

app.py

@@ -18,6 +18,22 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     """
     return "What magic will you build ?"
 
+@tool
+def get_current_exchange_rate_in_USD(currency: str, amount: float) -> str:
+    """A tool that fetches the current exchange rate for specified currency against the US Dollar (USD)
+    Args:
+        currency: A string representing a valid currency (e.g., 'CAD' for Canadian Dollar).
+        amount: A float representing an amount of currency to convert to USD.
+    """
+    data_url = 'https://open.er-api.com/v6/latest/USD'
+    try:
+        r = requests.get(data_url)
+        rates = r.json()['rates']
+        rate = rates[currency.upper()]
+        return f"{amount} units of {currency.upper()} currency is worth ${float(rate)*amount} US dollars."
+    except Exception as e:
+        return f"Error fetching currency rate for '{currency}': {str(e)}"
+
 @tool
 def get_current_time_in_timezone(timezone: str) -> str:
     """A tool that fetches the current local time in a specified timezone.