Read-only OAuth · local tokens · AccessLink v4
Polar AccessLink, packaged for agent workflows.
Polar MCP is an unofficial, open-source bridge that gives AI agents safe access to user-authorized Polar activity, sleep, Nightly Recharge, training, routes, samples, devices and tests through the official AccessLink Dynamic API v4.
npx -y polar-mcp-unofficial setup30tools
For humans
No API archaeology. No token pasted into agent configs.
Polar developer setup is the hard part. This page gives the exact callback, scopes and commands so a non-technical user can delegate the install safely.
Create your Polar client
Open the Polar AccessLink admin and add this callback URL.
http://127.0.0.1:3000/callbackGrant read scopes
The MCP is read-only by default. It needs the scopes below for broad agent summaries.
activity:read calendar:read continuous_samples:read devices:read nightly_recharge:read ppi_data:read profile:read routes:read skin_contact:read sleep:read sports:read temperature_measurement:read tests:read training_sessions:read training_targets:read user_subscription:readRun setup
npx -y polar-mcp-unofficial setup
npx -y polar-mcp-unofficial auth
npx -y polar-mcp-unofficial doctorThe toolbelt
Polar signals, shaped for agents.
For agents
A manifest that tells agents how not to break things.
Agents should call polar_agent_manifest and polar_connection_status first. Hermes gets direct tool names and explicit reload guidance so it does not restart the gateway for normal Polar access.
Install the unofficial Polar MCP server for me.
Repo: github.com/davidmosiah/polarmcp
Callback: http://127.0.0.1:3000/callback
Then run setup, auth and doctor.
Keep tokens local. No medical diagnosis.Trust boundary
Health and route data are not toy payloads.
This MCP exposes Polar AccessLink Dynamic API v4 data. It does not call private Polar Flow mobile endpoints, write data, or provide clinical diagnosis. Raw JSON is explicit; summary and structured modes are safer defaults.
Open source quantified-self infrastructure