mcp-server-withings
MCP server for the Withings Health API with per-user OAuth2, enabling users to securely access their own health data (measures, activity, sleep, workouts, heart rate, devices, and goals) and optionally add measurements.
README
mcp-server-withings
MCP server for the Withings Health API with per-user OAuth2 — each user links their own Withings account and can only ever see their own health data.
How isolation works
Behind an authenticating gateway that forwards the signed-in user as X-MCP-User, every tool is bound to that user. The server keeps an AES-256-GCM encrypted, per-user token store; a user's identity resolves only to their own row. Without a verified identity the server fails closed (no anonymous/shared access). Each user enrolls once via withings_connect, which returns a single-use Withings authorization URL bound to them; after they approve in the browser, /withings/callback stores their (encrypted) tokens.
Tools
Auth/enrollment: withings_connect, withings_status, withings_disconnect.
Read: withings_get_measures, withings_get_activity, withings_get_sleep, withings_get_workouts, withings_get_heart, withings_get_devices, withings_get_goals, withings_search_capabilities.
Write (opt-in WITHINGS_ENABLE_WRITES=true): withings_add_measure.
Configuration
See .env.example. Register a Withings app at account.withings.com; the redirect URI must match WITHINGS_REDIRECT_URI exactly and be publicly reachable (route /withings/callback to this container). Set WITHINGS_ENCRYPTION_KEY (never commit) and WITHINGS_TRUST_FORWARDED_USER=true behind the gateway.
Run
npm install
npm run dev:http # /mcp + /withings/callback on :3000
npm test
Docker images: ghcr.io/borgels/mcp-server-withings.
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