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fastmcp

punkpeye/fastmcp

FastMCP implements the legacy, handshake-based MCP revisions (2025-11-25 and earlier). It does not support the current specification, 2026-07-28, which made the protocol stateless — no initialize handshake and no Mcp-Session-Id. For a framework targeting the current spec, use ViteMCP.

View on GitHub1.4k

Install

npx fastmcp dev src/examples/addition.ts

Client configuration

{
  "mcpServers": {
    "my-mcp-server": {
      "command": "npx",
      "args": [
        "tsx",
        "/PATH/TO/YOUR_PROJECT/src/index.ts"
      ],
      "env": {
        "YOUR_ENV_VAR": "<YOUR_ENV_VAR>"
      }
    }
  }
}

Environment variables

YOUR_ENV_VAR
GitHub stars
1,372
Author
@punkpeye
Category
Developer Tools, AI Chatbot
Updated
Oct 6, 2026

About fastmcp

A TypeScript framework for building MCP servers capable of handling client sessions.

Features

  • Simple Tool, Resource, Prompt definition

  • OpenAPI to MCP conversion

  • Authentication

  • Passing headers through context

  • Session ID and Request ID tracking

  • Image content

  • Audio content

  • Error handling

  • HTTP Streaming (with SSE compatibility)

  • HTTPS Support for secure connections

Tools (5)

  • buffer

    The image data as a buffer.

  • readOnlyHint

    If true, indicates the tool does not modify its environment

  • destructiveHint

    If true, the tool may perform destructive updates (only meaningful when readOnlyHint is false)

  • idempotentHint

    If true, calling the tool repeatedly with the same arguments has no additional effect (only meaningful when readOnlyHint is false)

  • openWorldHint

    If true, the tool may interact with an "open world" of external entities

Details on this page are taken from the project's README. Open README

Supported clients

Clients mentioned in this server's README:

View all
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Claude Desktop

Desktop · Freemium · Proprietary

Anthropic's official Claude AI desktop application. Supports MCP servers to extend functionality.

WindowsMacOS
Cursor logo

Cursor

Desktop · Freemium · Proprietary

The first agentic IDE. The Cursor editor truly merges how developers and AI work together, delivering a magical coding experience.

WindowsMacOSLinux

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