Reading Resources from the Client

Let's now take the final step: adding functionality to the client so it can read the resource's data from your MCP server! This list of currencies and their symbols could be used as a checklist by an LLM to check that the user is requesting a currency supported by the convert_currency() tool, and also that the tool function's arguments are valid currency symbols.

The currency_server.py file has been spun up and is ready for you to use.

Este exercício faz parte do curso

Introduction to Model Context Protocol (MCP)

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Instruções do exercício

Define an async function called read_resource() that takes a resource_uri parameter of type str
Inside the function, use session.read_resource() with await to read the resource at the given URI, assigning the result to resource_content
Loop through the contents of each resource and print its .mimeType and .text attributes

Exercício interativo prático

Experimente este exercício completando este código de exemplo.

from mcp import ClientSession, StdioServerParameters
from mcp.client.stdio import stdio_client

# Define an async function for reading MCP resources
____ ____ ____(____: ____):
    """Read a specific resource by URI."""
    params = StdioServerParameters(
        command=sys.executable,
        args=["currency_server.py"],
    )

    async with stdio_client(params) as (reader, writer):
        async with ClientSession(reader, writer) as session:
            await session.initialize()

            print(f"Reading resource: {resource_uri}")
            # Read the resource from the session context
            resource_content = ____ ____

            # Print the contents of each resource
            for content in ____:
                print(f"\nContent ({content.mimeType}):")
                print(content.____)

            return resource_content

asyncio.run(read_resource("file://currencies.txt"))

Editar e executar o código