Port for the Arc Relay web UI and API proxy.

Ziel

8080

Standard

8080

Wert

8080

Persistent storage for SQLite database. Upgrading from MCP Wrangler? Point this at your existing /mnt/user/appdata/mcp-wrangler directory.

Ziel

/data

Standard

/mnt/user/appdata/arc-relay

Wert

/mnt/user/appdata/arc-relay

Docker socket for managing MCP server containers (stdio and HTTP server types).

Ziel

/var/run/docker.sock

Standard

/var/run/docker.sock

Wert

/var/run/docker.sock

Encrypts stored credentials (OAuth tokens, API keys, env vars). Generate with: openssl rand -hex 32. IMPORTANT: Do not lose this key - encrypted data becomes unreadable without it. Upgrading from MCP Wrangler? Use the same key as before.

Ziel

ARC_RELAY_ENCRYPTION_KEY

Signs web UI session cookies. Generate with: openssl rand -hex 32. If omitted, a random secret is generated on each restart (sessions won't survive restarts).

Ziel

ARC_RELAY_SESSION_SECRET

Password for the admin web UI account (only used on first run to create the admin user).

Ziel

ARC_RELAY_ADMIN_PASSWORD

Path to SQLite database inside the container. Upgrading from MCP Wrangler? Set to /data/mcp-wrangler.db or rename your DB file.

Ziel

ARC_RELAY_DB_PATH

Standard

/data/arc-relay.db

Wert

/data/arc-relay.db

External URL for OAuth callbacks and install scripts (e.g., https://mcp.yourdomain.com). Required for OAuth and invite token onboarding. Leave blank for http://localhost:PORT.

Ziel

ARC_RELAY_BASE_URL

Sentry DSN for error tracking. Leave blank to disable.

Ziel

ARC_RELAY_SENTRY_DSN

Anthropic API key for LLM-powered tool context optimization. Enables the 'Run Optimization' feature on server detail pages to compress tool descriptions and reduce token usage. Get a key at https://console.anthropic.com/. Leave blank to disable.

Ziel

ARC_RELAY_LLM_API_KEY

Model to use for tool optimization. Default is claude-haiku-4-5-20251001 (fast and cheap). Only change if you want to use a different Anthropic model.

Ziel

ARC_RELAY_LLM_MODEL

Standard

claude-haiku-4-5-20251001

Wert

claude-haiku-4-5-20251001