Garmin MCP App

Connect your Garmin watch to Claude Desktop. Explore interactive charts.

<p align="center"> <img src="https://github.com/user-attachments/assets/62b5ec61-a772-4502-b717-c32c4ea89195" alt="demo" width="600" /> </p>

Install

1. Download the latest .mcpb file from Releases
2. Drag it into Claude Desktop to install
3. Ask Claude anything about your Garmin data — it will prompt you to sign in on first use

What you can do

Ask Claude about your health, training, and fitness — it reads your Garmin data and shows interactive charts right in the conversation.

• Review your day — steps, heart rate, sleep, stress, body battery, and HRV
• Analyze your workouts — activity details, pace splits, HR zones, and training effect
• Track your fitness — training readiness, training load, VO2 Max trends, and race predictions
• Plan your training — create structured workouts, schedule them on your Garmin calendar, or edit existing ones

What you can visualize

Plot your activities <p align="center"> <img width="600" alt="activities" src="https://github.com/user-attachments/assets/c180a8c5-6b8a-4102-aad2-d64fd98e3a85" /> </p>

Visualize training readiness <p align="center"> <img width="600" alt="training readiness" src="https://github.com/user-attachments/assets/42b27fad-f425-4fe7-bd6f-e2816fbe4c12" /> </p> <details> <summary>Full list of supported Garmin Connect data</summary>

Category	Data
Daily health	Steps, heart rate, sleep stages, stress, body battery, HRV
Activities	Activity list, activity details, per-km/mile splits, HR time-in-zones
Training	Training readiness, training status & load, VO2 Max, race predictions
Profile	Age, weight, height, HR zones, lactate threshold
Workouts	List, create, update, delete, and schedule workouts

</details>

Privacy & Security

No data is stored or collected by this app. Your data flows directly between your machine and the Garmin Connect API — there is no intermediate server.

<details> <summary>Learn more</summary>

• Your credentials stay private. You sign in through a secure login form rendered inside Claude Desktop. The login and MFA tools are marked as app-only (visibility: ["app"]), meaning Claude (the LLM) cannot call them and never sees your email, password, or MFA code.
• Claude doesn't know who you are. The LLM only receives the health/fitness data you ask for (steps, sleep, etc.) — it has no access to your Garmin account credentials or OAuth tokens.
• Tokens are stored locally. OAuth tokens are saved on your machine at ~/.garminconnect/ with restrictive file permissions (0600). They are never sent anywhere other than the Garmin Connect API.
• You can log out anytime. Logging out clears all saved tokens from your machine.

</details>

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<details> <summary>Developer / Contributor Guide</summary>

Getting Started

git clone https://github.com/chenhunghan/garmin-mcp-app.git
cd garmin-mcp-app
npm install

npm install automatically sets up git hooks via prek:

• commit-msg — enforces Conventional Commits via commitlint
• pre-push — runs lint, format check, typecheck, and tests (same as CI)

Troubleshooting: core.hooksPath

If npm install warns about core.hooksPath, prek cannot install git hooks. Fix it by unsetting the local config:

git config --unset-all --local core.hooksPath
npm run prepare

Development

npm run dev        # watch-build server + UI
npm run dev:ui     # standalone UI dev at localhost:5173
npm run test:lib   # run garmin-connect tests
npm run pack       # build + package .mcpb bundle

npm run dev:ui opens http://localhost:5173 with the React UI wired to the real MCP server in-process. You can test login, MFA, and logout against the actual Garmin API without deploying to Claude Desktop.

Testing in Claude Desktop

Run npm run build (one-off) or npm run dev (watch mode for live rebuilds), then add to ~/Library/Application Support/Claude/claude_desktop_config.json:

{
  "mcpServers": {
    "garmin-mcp": {
      "command": "node",
      "args": ["/absolute/path/to/garmin-mcp-app/dist/index.js"]
    }
  }
}

Restart Claude Desktop. Ask Claude to check your Garmin auth — it will render the app UI in an iframe and run the real login/MFA flow.

Architecture

• MCP Server (src/server.ts) — Node.js server over stdio, registers tools + UI resource
• React UI (src/app.tsx) — Rendered in host's sandboxed iframe, communicates via postMessage
• garmin-connect (packages/garmin-connect/) — TypeScript client library for Garmin Connect OAuth + API

Commit Convention

Commits must follow the Conventional Commits format:

type(optional-scope): description

Allowed types: feat, fix, chore, docs, ci, refactor, test

</details>