MCP TypeScript SDK
Description
> [!IMPORTANT] **This is the `main` branch which contains v2 of the SDK (currently in development, pre-alpha).** > > We anticipate a stable v2 release in Q1 2026. Until then, **v1.x remains the recommended version** for production use. v1.x will continue to receive bug fixes and security updates for
Installation
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README
MCP TypeScript SDK
[!IMPORTANT] **This is the `main` branch which contains v2 of the SDK (currently in development, pre-alpha).**
We anticipate a stable v2 release in Q1 2026. Until then, **v1.x remains the recommended version** for production use. v1.x will continue to receive bug fixes and security updates for at least 6 months after v2 ships to give people time to upgrade.
For v1 documentation, see the [V1 API docs](https://ts.sdk.modelcontextprotocol.io/). For v2 API docs, see [`/v2/`](https://ts.sdk.modelcontextprotocol.io/v2/).
Table of Contents
Overview
The Model Context Protocol (MCP) allows applications to provide context for LLMs in a standardized way, separating the concerns of providing context from the actual LLM interaction.
This repository contains the TypeScript SDK implementation of the MCP specification. It runs on **Node.js**, **Bun**, and **Deno**, and ships:
- MCP server libraries (tools/resources/prompts, Streamable HTTP, stdio, auth helpers)
- MCP client libraries (transports, high-level helpers, OAuth helpers)
- Optional middleware packages for specific runtimes/frameworks (Express, Hono, Node.js HTTP)
- Runnable examples (under `examples/`)
Packages
This monorepo publishes split packages:
@modelcontextprotocol/server: build MCP servers@modelcontextprotocol/client: build MCP clients
Tool and prompt schemas use [Standard Schema](https://standardschema.dev/) — bring Zod v4, Valibot, ArkType, or any compatible library.
Middleware packages (optional)
...
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