io.github.slaat/garmin-connect-workouts-mcp

Garmin Connect Workouts MCP

An MCP (Model Context Protocol) server that turns natural-language workout descriptions into structured workouts in Garmin Connect. Describe a session in plain English and the calling model builds a typed step-by-step workout that this server encodes into Garmin's workout API format and creates directly in your account.

Features

• Pace, heart-rate, power and cadence targets - pace ranges, HR zones 1-5, explicit bpm ranges, cycling power, and cadence, all encoded against Garmin's real workoutTargetType table.
• Real repeat blocks - 5x1km becomes a single repeat group, not five duplicated steps, so the watch shows an actual rep counter.
• Swim workouts - per-step strokes (freestyle, backstroke, breaststroke, fly, drill, individual medley, or any stroke) and equipment (fins, kickboard, paddles, pull buoy, snorkel), plus a workout-level pool length in meters or yards.
• Full workout lifecycle - create, list, get, update, delete, and schedule workouts onto the Garmin Connect calendar.
• Structured input, not text parsing - the server never parses free text itself; every duration and target is an explicit, unit-tagged field, so there's nothing for a string like "10 min" to be silently misread as.

Quick Start

Claude Code

claude mcp add garmin-workouts npx garmin-connect-workouts-mcp

Claude Desktop

Add to your configuration file:

• macOS: ~/Library/Application Support/Claude/claude_desktop_config.json
• Windows: %APPDATA%\Claude\claude_desktop_config.json

{
  "mcpServers": {
    "garmin-workouts": {
      "command": "npx",
      "args": ["-y", "garmin-connect-workouts-mcp"]
    }
  }
}

Then restart Claude Desktop.

Authentication

Garmin Connect's web client authenticates with session cookies plus a CSRF token, not a password grant this server could hold on to. So the first time you create a workout (or whenever the session has expired):

1. The server checks the stored session with a cheap authenticated request.
2. If it's missing or rejected, run the authenticate_garmin tool. It opens a real browser window at connect.garmin.com for you to log in normally.
3. Once login completes, the session is captured and stored at ~/.config/garmin-connect-workouts-mcp/auth.json with 600 permissions (owner read/write only).

No password is ever stored - only the resulting session cookies and CSRF token. Garmin sessions expire, so you may be prompted to re-authenticate between sessions; the server detects this automatically and tells you when to run authenticate_garmin again. The login browser uses a persistent, isolated profile under ~/.config/garmin-connect-workouts-mcp/browser-profile/ so Garmin can remember the device across logins - it never touches your personal browser profile.

Tools

Usage Examples

• "Create a 30 minute easy run in zone 2"
• "10 min warmup zone 3, then 5x1km threshold intervals at 4:00/km with 2 min rest between, then 10 min cooldown zone 2"
• "8x400m at 5k pace with 60 second recovery, then check what workouts I already have scheduled this week"
• "Update workout 123456 to add a 5 minute cooldown, then schedule it for next Monday"
• "Create a 25m pool swim: 200m warmup any stroke, 4x100m freestyle with 30s rest using a kickboard, 100m breaststroke cooldown"

How targets work

A stated pace is treated as the fast edge of a range: Garmin stores pace as a range, not a single point, so 4:00/km on its own becomes a 4:00-4:10/km range, widened by 10 seconds. Give both fast and slow explicitly for a narrower or different range.

Development

pnpm install
pnpm test          # vitest: encoders + golden-file tests against real captured payloads
pnpm run build      # compile TypeScript to dist/
pnpm run dev        # run the server directly with tsx

Tests validate the workout encoders (targets, durations, repeat nesting) against fixtures captured from Garmin's own web client, so payload shape regressions get caught before they reach a real account.

Disclaimer

This is an unofficial, third-party project. It is not affiliated with, endorsed by, or sponsored by Garmin Ltd. or any of its affiliates, and it talks to Garmin Connect's web API by reverse-engineering the same requests the official web client makes. It may stop working if Garmin changes that API. Use at your own risk, and at your own responsibility for the workouts and data you send to your account.

Acknowledgements

Thanks to garmin-workouts-mcp by Charles Frisbee for the original idea of driving Garmin Connect workouts through MCP.

License

MIT