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felixweinberger merged 1 commit into from
Nov 19, 2025
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docs: update installation instructions for zod peer dependency #1139

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6 changes: 4 additions & 2 deletions README.md
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Expand Up @@ -47,9 +47,11 @@ The Model Context Protocol allows applications to provide context for LLMs in a
## Installation

```bash
npm install @modelcontextprotocol/sdk
npm install @modelcontextprotocol/sdk zod
```

This SDK has a **required peer dependency** on `zod` for schema validation. The SDK internally imports from `zod/v4`, but maintains backwards compatibility with projects using Zod v3.25 or later. You can use either API in your code by importing from `zod/v3` or `zod/v4`:

## Quick Start

Let's create a simple MCP server that exposes a calculator tool and some data. Save the following as `server.ts`:
Expand Down Expand Up @@ -130,7 +132,7 @@ app.listen(port, () => {
});
```

Install the deps with `npm install @modelcontextprotocol/sdk express zod@3`, and run with `npx -y tsx server.ts`.
Install the deps with `npm install @modelcontextprotocol/sdk express zod`, and run with `npx -y tsx server.ts`.

You can connect to it using any MCP client that supports streamable http, such as:

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