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lastfm-mcp

An MCP server for the Last.fm API, built on go-lastfm/v2 and the official Go MCP SDK.

It exposes the complete supported Last.fm surface as discoverable MCP tools over:

• stdio, for local desktop and CLI clients;
• Streamable HTTP, for local services and remote deployments.

Read-only tools are enabled by default. Writes, authentication helpers, and unsupported legacy methods require explicit opt-in.

Status

This project is prepared for its initial repository import. The module path is github.com/ndyakov/lastfm-mcp; change it before the first release if the repository will use a different owner or name.

Requirements

• Go 1.25 or later
• A Last.fm API account
• LASTFM_API_KEY
• LASTFM_API_SECRET and LASTFM_SESSION_KEY only when write tools are enabled

Run with stdio

export LASTFM_API_KEY="your-api-key"
go run ./cmd/lastfm-mcp

Example MCP client configuration:

{
  "mcpServers": {
    "lastfm": {
      "command": "/absolute/path/to/lastfm-mcp",
      "env": {
        "LASTFM_API_KEY": "your-api-key"
      }
    }
  }
}

Never place credentials in a configuration file that will be committed.

Run with Streamable HTTP

export LASTFM_API_KEY="your-api-key"
export LASTFM_MCP_TRANSPORT="http"
export LASTFM_MCP_HTTP_ADDR="127.0.0.1:8080"
go run ./cmd/lastfm-mcp

The MCP endpoint is http://127.0.0.1:8080/mcp; health checks use GET /healthz.

Non-loopback binds are rejected unless LASTFM_MCP_HTTP_TOKEN is set. Clients then send:

Authorization: Bearer <token>

The server applies Go's cross-origin protection around the MCP endpoint and sets conservative HTTP timeouts. Put TLS and production identity-aware authentication in a trusted reverse proxy.

Configuration

Environment variable	Default	Purpose
LASTFM_API_KEY	required	Last.fm API key
LASTFM_API_SECRET	empty	Required for signed/authenticated methods
LASTFM_SESSION_KEY	empty	Required for write tools
LASTFM_USER_AGENT	lastfm-mcp/<version>	Outbound Last.fm user agent
LASTFM_REQUEST_TIMEOUT	30s	Last.fm request timeout
LASTFM_MCP_TRANSPORT	stdio	stdio or http
LASTFM_MCP_HTTP_ADDR	127.0.0.1:8080	HTTP listen address
LASTFM_MCP_HTTP_PATH	/mcp	Streamable HTTP endpoint
LASTFM_MCP_HTTP_TOKEN	empty	HTTP bearer token; mandatory on non-loopback binds
LASTFM_ENABLE_WRITES	false	Register mutating tools
LASTFM_ENABLE_AUTH_TOOLS	false	Register credential/session tools
LASTFM_ENABLE_EXPERIMENTAL	false	Register legacy methods absent from Last.fm's public index

Equivalent command-line flags are available for transport, address, path, and feature gates. Run lastfm-mcp -h for details.

Tool coverage

The default server registers every stable read endpoint supported by go-lastfm/v2:

• album: info, user tags, top tags, search;
• artist: correction, info, similar, user tags, top albums/tracks/tags, search;
• chart: top artists, tracks, tags;
• geo: top artists and tracks;
• library: artists;
• tag: info, similar, top albums/artists/tracks/tags, weekly chart ranges;
• track: correction, info, similar, user tags, top tags, search;
• user: profile, friends, loved and recent tracks, personal tags, top albums/artists/tracks/tags, weekly charts and ranges.

LASTFM_ENABLE_WRITES=true adds album/artist/track tagging, love/unlove, now-playing, and scrobbling. These require an API secret and session key.

LASTFM_ENABLE_AUTH_TOOLS=true adds browser-token, authorization-URL, session-exchange, and mobile-session tools. These may expose session credentials to the MCP client and model; leave them disabled unless needed. Prefer completing authentication outside the MCP session and providing LASTFM_SESSION_KEY at process startup.

LASTFM_ENABLE_EXPERIMENTAL=true adds legacy tag search, metros, neighbours, artist/track top fans, and tasteometer comparison. Last.fm may change or disable these without notice.

Docker

docker build -t lastfm-mcp .
docker run --rm -p 127.0.0.1:8080:8080 \
  -e LASTFM_API_KEY \
  -e LASTFM_MCP_TRANSPORT=http \
  -e LASTFM_MCP_HTTP_ADDR=0.0.0.0:8080 \
  -e LASTFM_MCP_HTTP_TOKEN \
  lastfm-mcp

docker compose up --build uses the same HTTP setup and reads values from the environment.

Development

go mod tidy
go test -race ./...
go vet ./...

Until go-lastfm/v2 is published, use a temporary Go workspace containing this repository and the adjacent go-lastfm checkout. Do not commit a local replace directive.

See CONTRIBUTING.md, SECURITY.md, and ROADMAP.md.

License

MIT