A Model Context Protocol (MCP) server for Last.fm. Gives AI assistants access to your listening history, music discovery, and detailed track/artist/album information.

Runs on Cloudflare Workers with OAuth 2.0 authentication. Public tools (track info, artist info, similar artists) work without signing in -- connect your Last.fm account to access personal listening data.

Quick start

Claude.ai / Claude Desktop

1. Open Settings -> Connectors -> Add Custom Connector
2. Enter https://lastfm-mcp.com/mcp
3. Sign in to Last.fm when prompted

Claude Code

claude mcp add --transport http lastfm "https://lastfm-mcp.com/mcp"

Windsurf

Add to ~/.codeium/windsurf/mcp_config.json:

{
  "mcpServers": {
    "lastfm": {
      "serverUrl": "https://lastfm-mcp.com/mcp"
    }
  }
}

Other MCP clients

For clients that don't support remote servers directly (Continue.dev, Zed, etc.), use mcp-remote:

{
  "mcpServers": {
    "lastfm": {
      "command": "npx",
      "args": ["-y", "mcp-remote", "https://lastfm-mcp.com/mcp"]
    }
  }
}

MCP Inspector

npx @modelcontextprotocol/inspector https://lastfm-mcp.com/mcp

Authentication

The server uses OAuth 2.0. When you connect from a supported client, your browser opens to Last.fm to authorize access. Tokens persist across sessions.

Public tools work without signing in. You only need to connect your account for personal listening data.

Available tools

Public tools

Personal tools (requires sign-in)

Temporal queries (requires sign-in)

Good for questions like "when did I start listening to Led Zeppelin?" or "what was I into last March?"

Resources

The server exposes MCP resource URIs:

lastfm://user/{username}/recent          # Recent tracks
lastfm://user/{username}/top-artists     # Top artists
lastfm://user/{username}/top-albums      # Top albums
lastfm://user/{username}/loved           # Loved tracks
lastfm://user/{username}/profile         # User profile
lastfm://track/{artist}/{track}          # Track info
lastfm://artist/{artist}                 # Artist info
lastfm://album/{artist}/{album}          # Album info
lastfm://artist/{artist}/similar         # Similar artists
lastfm://track/{artist}/{track}/similar  # Similar tracks

Prompts

Development

Prerequisites

• Node.js 20 or newer (CI runs 20)
• Cloudflare Workers account
• Last.fm API key (create one here)

Local setup

git clone https://github.com/rianvdm/lastfm-mcp.git
cd lastfm-mcp
npm install

Create .dev.vars (or copy .dev.vars.example):

LASTFM_API_KEY=your_api_key
LASTFM_SHARED_SECRET=your_shared_secret

npm run dev

Test with the inspector:

npx @modelcontextprotocol/inspector http://localhost:8787/mcp

Deployment

Set production secrets (or run npm run setup:prod, which creates the KV namespaces and prompts for these):

echo "your_api_key" | wrangler secret put LASTFM_API_KEY --env production
echo "your_shared_secret" | wrangler secret put LASTFM_SHARED_SECRET --env production

Deploy:

npm run deploy:prod

Testing

npm test          # vitest, in workerd via @cloudflare/vitest-pool-workers
npm run lint
npm run build     # wrangler deploy --dry-run: catches type and binding errors

Architecture

• Runtime: Cloudflare Workers
• Protocol: MCP (streamable HTTP)
• Auth: OAuth 2.0 (RFC 9728) via @cloudflare/workers-oauth-provider; the provider owns sessions and tokens
• Storage: Cloudflare KV for OAuth state, sessions, caching, and rate-limit counters
• Rate limiting: per-IP on /mcp, so one client can't exhaust the shared Last.fm API key's budget
• API: Last.fm Web API v2.0

Endpoints

Contributing

1. Fork the repo
2. Create a feature branch
3. Commit your changes
4. Open a pull request

License

MIT