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Garmin MCP Server

by zjromani

Garmin MCP Server

A webhook receiver and MCP (Model Context Protocol) server that collects Garmin health data and makes it available to ChatGPT through OpenAI's Remote MCP integration.

Features

  • Garmin Webhook Receiver: Accepts health data from Garmin devices
  • SQLite Persistence: Stores data in SQLite database on EFS for reliability
  • MCP Integration: Provides health data to ChatGPT via OpenAI's Remote MCP
  • AWS Deployment: Runs on ECS Fargate with Terraform infrastructure
  • Rate Limiting: Protects webhook endpoints from abuse

Architecture

Garmin Device → Webhook → SQLite DB → MCP Server → ChatGPT

Data Collected

  • Daily step count
  • Resting heart rate
  • Active calories burned
  • Sleep duration
  • Body battery levels

Quick Start

Local Development

  1. Clone the repository:
git clone https://github.com/yourusername/garmin-mcp.git cd garmin-mcp
  1. Install dependencies:
npm install
  1. Set up environment variables:
cp env.example .env # Edit .env with your configuration
  1. Build and run:
npm run build npm start

Docker

docker-compose up --build

Local HTTPS (Cloudflare Quick Tunnel)

You can expose your local server with a temporary public HTTPS URL (no DNS or account needed):

brew install cloudflared ./scripts/cloudflared-quick.sh

This prints a https://<random>.trycloudflare.com URL. Use it for testing endpoints:

  • Webhook: https://<random>.trycloudflare.com/garmin/webhook
  • Health: https://<random>.trycloudflare.com/healthz

Environment Variables

VariableDescriptionRequired
PORTServer port (default: 8080)No
MCP_API_TOKENBearer token for MCP authenticationYes
GARMIN_WEBHOOK_SECRETSecret for webhook signature verificationNo
GARMIN_API_KEYGarmin Health API keyNo
GARMIN_API_SECRETGarmin Health API secretNo

API Endpoints

Webhook

  • POST /garmin/webhook - Receives Garmin health data

MCP (Model Context Protocol)

  • GET /mcp/tools - Lists available tools
  • POST /mcp/tools/call - Executes a tool
  • GET /mcp/sse - Server-sent events endpoint

Health

  • GET /healthz - Health check endpoint

MCP Tools

garmin.getDailySummary

Get daily health summary for a user and date.

Parameters:

  • user_id (string, required): User identifier
  • date (string, optional): Date in YYYY-MM-DD format (defaults to today)

garmin.getRecentDays

Get health data for the last N days.

Parameters:

  • user_id (string, required): User identifier
  • days (number, optional): Number of days to retrieve (default: 7)

Versioning & Deployment

Versioning Strategy

We use git-based versioning for Docker images:

  • Git Tags: Create semantic version tags (e.g., v1.0.0, v1.1.0)
  • Docker Tags: Images are tagged with both the git version and latest
  • Rollback: Can easily rollback by updating ECS task definition to use a previous version
Creating a Release
# 1. Create a git tag for the release git tag v1.0.0 # 2. Build and push with versioning cd terraform ./build-and-push.sh # 3. Deploy to ECS aws ecs update-service --cluster garmin-mcp-cluster --service garmin-mcp-service --force-new-deployment
Version History
  • v0.1.0: Initial release with SQLite persistence and integration tests
  • Next: v1.0.0 - Production ready with Cloudflare Tunnel deployment
Rollback Process
# List available versions in ECR aws ecr describe-images --repository-name garmin-mcp --query 'imageDetails[*].imageTags' --output table # Update task definition to use specific version aws ecs update-service --cluster garmin-mcp-cluster --service garmin-mcp-service --task-definition garmin-mcp-task:REVISION_NUMBER

Deployment

AWS with Terraform (Cost Optimized - ~$9/month)

Our infrastructure uses a cost-optimized architecture with Cloudflare Tunnel for secure access:

  • ECS Fargate: Single task with 0.25 vCPU, 0.5GB RAM
  • No NAT Gateway: Saves ~$33/month by using public IP for outbound only
  • Cloudflare Tunnel: Provides secure HTTPS access without public inbound traffic
  • EFS Storage: SQLite database persistence (~$0.30/month)
Prerequisites
  1. Cloudflare Account: Create a tunnel and get the tunnel token
  2. AWS Credentials: Configure AWS CLI access
  3. Domain: Optional - for custom hostname instead of trycloudflare.com
Deploy Steps
  1. Create Cloudflare Tunnel:
    # Install cloudflared brew install cloudflared # Login to Cloudflare cloudflared tunnel login # Create tunnel cloudflared tunnel create garmin-mcp # Get tunnel token (save this) cloudflared tunnel token garmin-mcp
  2. Configure Terraform:
    cd terraform # Create terraform.tfvars with your tunnel token echo 'cloudflare_tunnel_token = "your-tunnel-token-here"' > terraform.tfvars
  3. Deploy:
    ./deploy.sh
  4. Configure Tunnel Route (optional):
    # For custom domain cloudflared tunnel route dns garmin-mcp webhook.yourdomain.com
Security Benefits
  • No Public Inbound: Security group blocks all incoming traffic
  • Outbound Only: Task can make outbound connections (Docker images, Cloudflare)
  • Encrypted Tunnel: All traffic encrypted through Cloudflare's edge
  • Cost Effective: No NAT Gateway or ALB required

Manual Deployment

  1. Build the Docker image
  2. Push to ECR
  3. Deploy to ECS Fargate

Privacy

This is a personal, non-commercial project. See PRIVACY.md for details on data collection and usage.

License

Personal use only. This project is not intended for commercial use.

Contributing

This is a personal project, but suggestions and improvements are welcome through issues and discussions.

-
security - not tested
F
license - not found
-
quality - not tested

remote-capable server

The server can be hosted and run remotely because it primarily relies on remote services or has no dependency on the local environment.

Enables ChatGPT to access and analyze personal Garmin health data including daily steps, heart rate, calories, sleep duration, and body battery levels. Collects data via webhook from Garmin devices and provides health insights through natural language queries.

  1. Features
    1. Architecture
      1. Data Collected
        1. Quick Start
          1. Local Development
          2. Docker
          3. Local HTTPS (Cloudflare Quick Tunnel)
        2. Environment Variables
          1. API Endpoints
            1. Webhook
            2. MCP (Model Context Protocol)
            3. Health
          2. MCP Tools
            1. garmin.getDailySummary
            2. garmin.getRecentDays
          3. Versioning & Deployment
            1. Versioning Strategy
            2. Deployment
            3. AWS with Terraform (Cost Optimized - ~$9/month)
            4. Manual Deployment
          4. Privacy
            1. License
              1. Contributing

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