Garmin MCP App

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

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

Visualize training readiness

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.

• 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.

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