What is FastMCP?
FastMCP is a TypeScript framework for building Model Context Protocol (MCP) servers. It handles client sessions and simplifies the creation of tools, resources, and prompts by managing boilerplate, connections, responses, and error handling automatically. It is intended for developers who want to build MCP servers quickly without dealing with the low-level implementation details of the official MCP SDK.
How to use FastMCP?
Install with npm install fastmcp. Create a server instance with a name and version, add tools using the .addTool() method (with Zod or any Standard Schema-compatible validation), then start the server with .start({ transportType: "stdio" }) for stdio or with HTTP streaming options. Test your server using the CLI commands npx fastmcp dev or npx fastmcp inspect.
Key features of FastMCP
- Simple Tool, Resource, and Prompt definition
- Built-in authentication and session tracking
- HTTP Streaming and SSE transport support
- Custom HTTP routes for REST APIs and webhooks
- Edge runtime support (Cloudflare Workers, Deno Deploy)
- Stateless mode for serverless deployments
- CORS enabled by default, with full configuration options
- HTTPS support with SSL certificates
Use cases of FastMCP
- Rapidly prototype an MCP server that adds two numbers or performs other simple functions
- Build a remote MCP server accessible over HTTP Streaming or SSE for client connections
- Deploy an MCP server to edge runtimes like Cloudflare Workers for global low-latency access
- Create an MCP server that also serves custom REST APIs, admin panels, or webhooks on the same HTTP port
- Implement an MCP server with authentication, session management, and progress notifications for complex client interactions
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