Defining MCP Server Resources

You're expanding your MCP server for currency conversion to give it access to the list of currencies supported by the API you're using. The European Central Bank publishes a list of currency codes in a file called currencies.txt that is available in your server directory. This could be used by the client to ensure that the LLM is passing the correct argument values to the tool functions.

Your task is to define an MCP resource called get_currencies() that reads the contents of currencies.txt.

This exercise is part of the course

Introduction to Model Context Protocol (MCP)

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Exercise instructions

Use the correct decorator and the "file://currencies.txt" URI to convert the get_currencies() function into a resource.
Complete the get_currencies() function to open and read the contents of the currencies.txt file.
Print the result of calling get_currencies() to verify the resource works correctly.

Hands-on interactive exercise

Have a go at this exercise by completing this sample code.

from mcp.server.fastmcp import FastMCP

mcp = FastMCP("Currency Converter")

# Define a resource for the currencies file
____
def get_currencies() -> str:
    """
    Get the list of currency names published by the European Central Bank for currency conversion.

    Returns:
        Contents of the currencies.txt file with currency names
    """
    # Open currencies.txt and read the data
    try:
        with open('____', 'r') as f:
            content = f.____
        return content
    except FileNotFoundError:
        return "currencies.txt file not found"

# Test the resource function
print(____)

Edit and Run Code