OwnMetrics

ownmetrics-mcp

Ask Claude, ChatGPT or any MCP-capable AI app about your own Garmin data: sleep, HRV, stress, Body Battery, heart rate, activities and more. It uses Garmin's official Personal API, runs on your own computer, and is read-only.

Unofficial project. Not affiliated with, endorsed by or supported by Garmin. "Garmin" and "Garmin Connect" are trademarks of Garmin Ltd. or its subsidiaries. Results are informational, not medical advice.

Status: v0.2 (preview). Nine data tools and four insight tools (training summaries, period comparisons, trends, training vs sleep). FIT-file analysis is next.

What you can ask

• "How did I sleep this week? Which night was worst, and why?"
• "Show my HRV for the last 30 days. Is it trending down?"
• "What were my stress and Body Battery like yesterday?"
• "List my runs this month with distance and average pace."
• "Break down my last long ride: power, heart rate, training effect."
• "How has my resting heart rate changed since September?"
• "Which month did I sleep best this year, and how much did I train that month?"
• "Compare my sleep and training this October with last October."
• "Do my evening tennis sessions go with worse sleep?"
• "Is my Garmin connection working?"

Set up in about 10 minutes

You need a Garmin Connect account and an AI app that supports MCP servers (Claude Desktop, Claude Code, ChatGPT desktop, Cursor and others).

1. Install uv (one time)

uv runs Python tools without any manual setup.

• macOS / Linux: open Terminal and run curl -LsSf https://astral.sh/uv/install.sh | sh
• Windows: open PowerShell and run powershell -ExecutionPolicy ByPass -c "irm https://astral.sh/uv/install.ps1 | iex"

2. Create your Garmin Personal API key

1. Sign in to Garmin Connect on the web and open Settings → Personal API.
2. Select Create Key, read and accept Garmin's terms, and choose how long the key lasts (30 days to a year; your choice).
3. Copy the key. Garmin shows it only once.

3. Save the key

uvx ownmetrics-mcp auth

Paste the key when asked (it stays hidden). It is checked with Garmin, then saved to ~/.config/garmin/connect-personal-api-key in your home folder. On macOS and Linux the file is readable only by you; on Windows it sits in your user profile folder, protected by your Windows account.

4. Add it to your AI app

Claude Desktop: Settings → Developer → Edit Config, then add:

{
  "mcpServers": {
    "ownmetrics": {
      "command": "uvx",
      "args": ["ownmetrics-mcp"]
    }
  }
}

Restart Claude Desktop.

Claude Code:

claude mcp add ownmetrics -- uvx ownmetrics-mcp

Other apps: use command uvx with the argument ownmetrics-mcp.

Updating

uvx keeps the version it first downloaded. To move to the latest release, run uvx ownmetrics-mcp@latest --version, then restart your AI app.

Then ask: "Check my Garmin connection, then summarize my sleep and HRV for the last week."

Tools

Insight tools do the fetching and the math in one call, over up to a year:

Sleep and HRV are dated by the morning the night ended (woke_up_on), as Garmin does. Pace is shown for running, walking and hiking; speed for other sports; distance says "not applicable" for sports like strength training or pilates.

Every field name carries its unit (resting_hr_bpm, distance_km, sleep_score_0_100). Where Garmin has no value, the field says "not recorded", never zero.

What Garmin's Personal API does not provide

• Read-only: nothing can be sent to your watch or written to Garmin Connect.
• Not available: training readiness, training status, acute/chronic load, VO2 max, gear and devices. The tools say "not provided by Garmin's Personal API" rather than guessing.
• Data tools cover up to 90 days per question and insight tools up to 366 days; the server splits requests to stay within Garmin's own limits.

Privacy and security

• Runs on your computer. Talks only to Garmin. No database, no telemetry.
• Your AI app sends tool results to its AI model, under that provider's terms.
• Your key never appears in tool results, logs or errors.
• Delete the key in Garmin Connect at any time to cut off access instantly.

Details: PRIVACY.md · THREAT_MODEL.md · Report vulnerabilities: SECURITY.md

Use of Garmin's API is subject to Garmin's terms: your key is personal to you and must not be shared.

Troubleshooting

• "Garmin rejected your Personal API key": it expired or was deleted. Create a new one and run step 3 again. Garmin emails a reminder about a week before a key expires.
• The AI app doesn't see the tools: restart the app fully. On macOS, if uvx isn't found, use its full path (run which uvx in Terminal) as the command.
• Check the connection yourself: uvx ownmetrics-mcp status

How it's built

This project is built with spec-driven development. SPEC.md holds numbered requirements and the non-negotiable rules; every requirement traces to tests in TRACEABILITY.md, which CI regenerates and checks on every change. Contributions follow the same path: see CONTRIBUTING.md.

Built on Garmin's official connect-personal-api-python client and the Model Context Protocol Python SDK.

License

MIT