Polar MCP

Give your AI agent your Polar Nightly Recharge, training load, PPI and HRV data — locally.
Local-first MCP server — tokens never leave your machine.

⚡ One-command install with Delx Wellness for Hermes: npx -y delx-wellness-hermes setup — preconfigures this connector and the other 8 in a dedicated Hermes profile.

Or wire it standalone into Claude Desktop / Cursor / ChatGPT Desktop — see the install section below.

HTTP (v2 stateless)

Default is stdio. Optional Streamable HTTP — no session id, JSON responses, loopback only:

npx -y polar-mcp-unofficial --http
# GET  http://127.0.0.1:3000/health
# POST http://127.0.0.1:3000/mcp   (sessionless)

Env: POLAR_MCP_HOST, POLAR_MCP_PORT, POLAR_MCP_TRANSPORT=http.

Local-first MCP server that connects AI agents to your Polar training, sleep, Nightly Recharge and continuous-sample data.

Unofficial project. Not affiliated with, endorsed by or supported by Polar Electro Oy. Polar is a trademark of its respective owner. Use this only with your own Polar account and in line with the Polar AccessLink API terms.

Built by David Mosiah for people who use Claude, Cursor, Hermes, OpenClaw or other MCP-compatible agents to think about training load, recovery and endurance - without copy-pasting numbers from Polar Flow.

Part of Delx Wellness, a registry of local-first wellness MCP connectors.

If this connector helps your agent workflow, please star the repo. Stars make the project easier for other AI builders to discover and help Delx keep shipping local-first wellness infrastructure.

Why this exists

Polar has one of the deepest training-physiology stacks among consumer wearables - Nightly Recharge, continuous samples, PPI (pulse-to-pulse intervals), training targets, sport profiles, orthostatic and fitness tests. The Polar AccessLink Dynamic API v4 exposes this data, but with 16 fine-grained OAuth scopes and a structure that's harder to navigate than typical consumer APIs.

This package handles the OAuth dance locally, normalizes responses across the v4 endpoints, redacts GPS by default, and exposes Polar through the Model Context Protocol. Tokens never leave your machine.

Setup in 60 seconds

You'll need a Polar AccessLink client (create one here) with redirect URI http://127.0.0.1:3000/callback.

npx -y polar-mcp-unofficial setup    # interactive: paste client id + secret
npx -y polar-mcp-unofficial auth     # opens browser, captures the OAuth code
npx -y polar-mcp-unofficial doctor   # verifies you're ready

Recommended scopes (request the ones matching the data you want):

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:read

Then add this to your MCP client config:

{
  "mcpServers": {
    "polar": {
      "command": "npx",
      "args": ["-y", "polar-mcp-unofficial"]
    }
  }
}

For Claude Desktop, run setup --client claude and the snippet is written for you.

Try it with your agent

Three things to ask first:

Use polar_connection_status to check setup, then run polar_daily_summary.
Give me a 5-line training brief for today.

Call polar_weekly_summary with response_format=json. Identify my biggest
training-load/recovery bottleneck and give me a next-week plan.

Use the polar_training_load_investigation prompt, after=2026-04-01.
Walk me through my recent training sessions + Nightly Recharge.

Data availability

This package uses the official Polar AccessLink Dynamic API v4. When this README says raw, it means the upstream Polar JSON for a supported endpoint - not raw device sensor streams.

Tools

Start with these:

• polar_quickstart - personalized 3-step setup walkthrough that adapts to what's already configured
• polar_connection_status - verify local setup, scopes and readiness before calling Polar
• polar_data_inventory — inventory supported data domains, scopes, privacy modes and recommended first calls without calling Polar APIs.
• polar_demo - synthetic example payloads so agents see the contract before calling the real API
• polar_daily_summary - sleep, activity, Nightly Recharge and training brief for today
• polar_weekly_summary - scorecard, comparison vs prior week, next-week plan
• polar_wellness_context - Nightly Recharge, sleep and training load in the shared wellness_context shape

Auth & diagnostics

• polar_capabilities, polar_agent_manifest, polar_privacy_audit, polar_cache_status
• polar_get_auth_url, polar_exchange_code, polar_revoke_access

Account

• polar_get_account_data, polar_list_user_devices, polar_list_subscriptions

Shared wellness profile (local, never Polar data)

• polar_onboarding, polar_profile_get, polar_profile_update — the Delx Wellness profile shared with the other connectors; stores only what the user typed, never tokens or biomarkers

Activity & sleep

• polar_list_activity, polar_list_calendar
• polar_list_sleeps, polar_list_sleep_wake_vectors — sleep lists hydrate available dates with the v4 sleep-result, sleep-evaluation, and sleep-score features by default
• polar_list_nightly_recharge

Heart & physiology (date range)

• polar_heart_series — agent-safe-series/v1 bounded HR from continuous samples (prefer this for agents)
• polar_list_continuous_samples, polar_list_ppi_samples
• polar_list_temperature_measurements, polar_list_skin_contacts

Training

• polar_list_training_sessions, polar_list_training_targets, polar_list_training_target_favorites
• polar_list_tests

Sports & routes

• polar_list_sports, polar_list_sport_profile_catalog, polar_list_sport_profiles
• polar_get_route - GPS coordinates redacted unless raw mode

Prompts

• polar_daily_checkin - practical daily training and recovery check-in
• polar_weekly_review - review trends across activity, sleep and recovery
• polar_training_load_investigation - investigate training sessions + recovery context

Resources

• polar://capabilities, polar://agent-manifest, polar://inventory
• polar://summary/daily, polar://summary/weekly
• polar://account-data, polar://latest/sleep

Privacy & security