Add a currency converter tool

app.py

@@ -18,6 +18,27 @@ def my_custom_tool(arg1:str, arg2:int)-> str: #it's import to specify the return
     """
     return "What magic will you build ?"
 
+@tool
+def convert_currency(amount: float, from_currency: str, to_currency: str) -> str:
+    """A tool that converts a given amount from one currency to another using real-time exchange rates.
+    Args:
+        amount: The amount of money to convert.
+        from_currency: The source currency code (e.g., 'USD', 'EUR').
+        to_currency: The target currency code (e.g., 'JPY', 'GBP').
+    """
+    try:
+        response = requests.get(f"https://api.exchangerate-api.com/v4/latest/{from_currency}")
+        data = response.json()
+        rate = data['rates'].get(to_currency)
+
+        if rate:
+            converted_amount = amount * rate
+            return f"{amount} {from_currency} is approximately {converted_amount:.2f} {to_currency}."
+        else:
+            return f"Conversion rate from {from_currency} to {to_currency} not found."
+    except Exception as e:
+        return f"Error fetching exchange rates: {str(e)}"
+
 @tool
 def get_current_time_in_timezone(timezone: str) -> str:
     """A tool that fetches the current local time in a specified timezone.