Making API Tool Calls Robust
In production, the currency server's convert_currency() tool should not hang if the exchange-rate API is slow or unreachable. To mitigate this, you'll implement a timeout to the request and ensure any failure returns a short, clear error message to the user instead of a raw exception.
An MCP server has already been instantiated and stored as the variable mcp.
Bu egzersiz
Introduction to Model Context Protocol (MCP)
kursunun bir parçasıdırEgzersiz talimatları
- Implement try-except logic that will attempt the API request, and gracefully fail if an error is returned by capturing the exception.
- Add a timeout of 10 seconds to the
requests.get()call so the request does not hang indefinitely.
Uygulamalı interaktif egzersiz
Bu örnek kodu tamamlayarak bu egzersizi bitirin.
@mcp.tool()
def convert_currency(amount: float, from_currency: str, to_currency: str) -> str:
"""
Convert an amount from one currency to another using current exchange rates.
Args:
amount: The amount to convert
from_currency: Source currency code (e.g., 'USD', 'EUR', 'GBP')
to_currency: Target currency code (e.g., 'USD', 'EUR', 'GBP')
Returns:
A string with the conversion result and exchange rate
"""
url = f"https://api.frankfurter.dev/v1/latest?base={from_currency}&symbols={to_currency}"
# Implement try-except to gracefully handle errors
____:
# Add a 10-second timeout so the request does not hang
r = requests.get(url, ____=____)
r.raise_for_status()
data = r.json()
rate = data["rates"].get(to_currency)
if rate is None:
return f"Could not find exchange rate for {from_currency} to {to_currency}"
return f"{amount} {from_currency} = {amount * rate:.2f} {to_currency} (Rate: {rate})"
____ requests.exceptions.RequestException as e:
return f"Error converting currency: {e}"
print(convert_currency(10, "USD", "EUR"))