Arr-MCP

An MCP server for your \*ARR stack — Radarr, Sonarr, Lidarr, Readarr, and Prowlarr.

Supports stdio (local, Claude Desktop) and HTTP/Streamable HTTP (remote, ChatGPT, any MCP-compatible client).

Tools

Cross-service

Radarr (Movies)

Sonarr (TV Shows)

Lidarr (Music)

Readarr (Books)

Prowlarr (Indexers)

Setup

1. Install & Build

npm install
npm run build

2. Configure

Copy .env.example to .env and fill in your service URLs and API keys. Only configure the services you use — unconfigured services are skipped at startup and their tools don't appear.

API keys: Settings → General → Security → API Key in each app.

Transport modes

stdio — local (Claude Desktop)

Default mode. The MCP client launches the process directly.

{
  "mcpServers": {
    "arr": {
      "command": "node",
      "args": ["/path/to/arr-mcp/dist/index.js"],
      "env": {
        "RADARR_URL": "http://localhost:7878",
        "RADARR_API_KEY": "...",
        "SONARR_URL": "http://localhost:8989",
        "SONARR_API_KEY": "..."
      }
    }
  }
}

HTTP — remote (ChatGPT, hosted clients)

Set MCP_TRANSPORT=http. The server listens on http://HOST:PORT/mcp and accepts POST requests per the MCP Streamable HTTP spec.

MCP_TRANSPORT=http MCP_PORT=3000 \
  RADARR_URL=http://... RADARR_API_KEY=... \
  node dist/index.js

A GET /health endpoint is also available for uptime checks.

Docker

Het gepubliceerde image staat op GitHub Container Registry:

ghcr.io/ltmarx/arr-mcp:latest

De docker-compose.yml heeft twee profielen — stdio en http — die nooit tegelijk actief zijn.

HTTP mode — remote/persistent server

cp .env.example .env   # vul je keys in
docker compose --profile http up

De server luistert op http://<host>:3000/mcp. Poort aanpassen: MCP_PORT=8080 docker compose --profile http up.

Controleer of de server draait:

curl http://localhost:3000/health
# → {"status":"ok","transport":"http"}

Stdio mode — lokaal (Claude Desktop)

docker compose --profile stdio up

Of direct via docker run (wordt gestart door de MCP client):

docker run --rm -i \
  -e RADARR_URL=http://192.168.1.x:7878 \
  -e RADARR_API_KEY=abc123 \
  ghcr.io/ltmarx/arr-mcp:latest

MCP client config voor Claude Desktop:

{
  "mcpServers": {
    "arr": {
      "command": "docker",
      "args": ["run", "--rm", "-i",
        "-e", "RADARR_URL", "-e", "RADARR_API_KEY",
        "-e", "SONARR_URL", "-e", "SONARR_API_KEY",
        "ghcr.io/ltmarx/arr-mcp:latest"
      ],
      "env": {
        "RADARR_URL": "http://localhost:7878",
        "RADARR_API_KEY": "...",
        "SONARR_URL": "http://localhost:8989",
        "SONARR_API_KEY": "..."
      }
    }
  }
}

Tip: Als je \*ARR draait op de host machine gebruik dan host.docker.internal (Mac/Windows) of het host IP-adres in plaats van localhost.

Releases

Releases worden automatisch gepubliceerd via GitHub Actions. Maak een tag aan op GitHub (v1.0.0) en publiceer een Release — het multi-arch image (amd64 + arm64) verschijnt vanzelf op GHCR.

Development

npm run dev   # run met tsx (geen build stap)
npm run build # compileer naar dist/
npm start     # run gecompileerde output