MCP Academy · 课时

打开客户端会话

连接服务器并完成握手。

打开客户端会话 是 CoddyKit 上的免费 MCP Academy 课时。这是第 1 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 MCP Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 MCP Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

You Become the Caller

So far the server advertised tools and waited. Now you flip roles and write the client that reaches out, connects, and drives a server from your own Python code.

Same SDK, Client Side

The official mcp package you already installed ships the client too. No new dependency is needed to start connecting to servers.

from mcp import ClientSession, StdioServerParameters

Pick a Transport

A client first chooses how to reach the server. For a local process you use the stdio transport, talking over standard input and output.

from mcp.client.stdio import stdio_client

Describe How to Launch It

You tell stdio exactly how to start the server with StdioServerParameters: the command to run and any arguments it needs.

params = StdioServerParameters(
    command="python",
    args=["server.py"],
)

Open the Pipes

The stdio_client launches the server and hands you two streams, one to read replies and one to write requests. It is an async context manager.

async with stdio_client(params) as (read, write):
    ...

Wrap Streams in a Session

Raw streams are low level, so you wrap them in a ClientSession. The session speaks JSON-RPC for you and tracks the request ids.

async with ClientSession(read, write) as session:
    ...

Run the Handshake

Before anything else, call session.initialize(). This performs the initialize exchange so both sides agree on version and capabilities.

await session.initialize()

Everything Is Async

MCP clients are built on asyncio, so your connecting code lives inside an async function and you await each network call.

import asyncio

async def main():
    ...

asyncio.run(main())

Why a Session Object

The session is your handle for the whole conversation. Once initialized, you call methods on it to list and use what the server offers.

One Session per Server

Each server you connect to gets its own client session. To talk to several servers, you open several sessions, each over its own transport.

Clean Up Automatically

Because the session and transport are context managers, leaving the async with block shuts the server down and closes the streams for you.

Quick Check

Which call must run before you list or invoke anything?

Recap: Connecting In

You built a client: choose a transport, launch the server with parameters, wrap the streams in a session, and call initialize before doing real work.

常见问题解答

「打开客户端会话」课时是免费的吗？

是的 — 「打开客户端会话」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 MCP Academy 课程的其余内容，请升级到 CoddyKit PRO。 MCP Academy 课程共包含 4 节课。

「打开客户端会话」这节课中我会学到什么？

连接服务器并完成握手。你通过在浏览器中直接运行的动手代码来练习 MCP Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 MCP Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 MCP Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 1 节课，共 4 节。

「打开客户端会话」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 MCP Academy 课中编写并运行代码吗？

能。每节 MCP Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

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