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Requirements

FastMCP TypeScript runs on Node.js 22 or later. There is no browser support.

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Install the package

npm install @prefecthq/fastmcp-ts
The package exposes two subpath entrypoints, so you only pull in what you use: 
import { FastMCP } from '@prefecthq/fastmcp-ts/server'
import { Client } from '@prefecthq/fastmcp-ts/client'
It also installs the fastmcp CLI as a self-contained binary: 
npx fastmcp --help

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Schema library

Input and output schemas work with any Standard Schema-compatible validation library — Zod, Valibot, ArkType, and others. Most examples in these docs use Zod: 
npm install zod

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Optional peer dependencies

The client’s sampling adapters forward LLM sampling requests to your AI provider. Each adapter requires its provider SDK, declared as an optional peer dependency — install only the one you use:
AdapterInstall
AnthropicSamplingAdapternpm install @anthropic-ai/sdk
OpenAISamplingAdapternpm install openai
GoogleSamplingAdapternpm install @google/genai
Nothing breaks if these are absent — the adapters import provider types with import type, so there is no runtime cost or error unless you actually instantiate one.

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Next steps

Quickstart

Build and run your first MCP server.