hevy-mcp: Model Context Protocol Server for Hevy Fitness API

A Model Context Protocol (MCP) server implementation that interfaces with the Hevy fitness tracking app and its API. This server enables AI assistants to access and manage workout data, routines, exercise templates, and more through the Hevy API (requires PRO subscription).

Features

• Workout Management: Fetch, create, and update workouts
• Routine Management: Access and manage workout routines
• Exercise Templates: Browse available exercise templates
• Folder Organization: Manage routine folders
• Webhook Subscriptions: Create, view, and delete webhook subscriptions for workout events

Prerequisites

• Node.js (v20 or higher)
• npm or yarn
• A Hevy API key

Installation

Installing via Smithery

To install hevy-mcp for Claude Desktop automatically via Smithery:

npx -y @smithery/cli install @chrisdoc/hevy-mcp --client claude

Manual Installation

# Clone the repository
git clone https://github.com/chrisdoc/hevy-mcp.git
cd hevy-mcp

# Install dependencies
npm install

# Create .env file from sample
cp .env.sample .env
# Edit .env and add your Hevy API key

Integration with Cursor

To use this MCP server with Cursor, you need to update your ~/.cursor/mcp.json file by adding the following configuration:

{
  "hevy-mcp-server": {
    "command": "npx",
    "args": ["-y", "hevy-mcp"],
    "env": {
      "HEVY_API_KEY": "your-api-key-here"
    }
  }
}

Make sure to replace your-api-key-here with your actual Hevy API key.

Configuration

You can supply your Hevy API key in two ways:

1. Environment variable (HEVY_API_KEY)
2. Command-line argument (--hevy-api-key=your_key or hevy-api-key=your_key after -- when using npm scripts)

Create a .env file in the project root (you can copy from .env.sample) with the following content if using the environment variable approach:

HEVY_API_KEY=your_hevy_api_key_here

Replace your_hevy_api_key_here with your actual Hevy API key. If you prefer the command argument approach you can skip setting the environment variable and start the server with for example:

npm start -- --hevy-api-key=your_hevy_api_key_here

Or in HTTP mode:

npm start -- --http --hevy-api-key=your_hevy_api_key_here

Transport Modes

The MCP server supports two transport modes:

Stdio Transport (Default)

The default mode uses stdio transport, which is suitable for integration with MCP clients like Claude Desktop and Cursor:

npm start
# or
node dist/index.js

HTTP Transport

The server can also run in HTTP mode for remote access or web-based integrations:

# Start in HTTP mode (env var)
npm start -- --http
# Start in HTTP mode (CLI arg)
npm start -- --http --hevy-api-key=your_hevy_api_key_here
# Or using node directly
node dist/index.js --http --hevy-api-key=your_hevy_api_key_here

# Using environment variable
MCP_TRANSPORT=http npm start

HTTP Configuration

The HTTP transport can be configured using environment variables:

# Transport mode
MCP_TRANSPORT=http

# HTTP server configuration
MCP_HTTP_HOST=127.0.0.1
PORT=3000

# DNS rebinding protection (recommended for production)
MCP_DNS_REBINDING_PROTECTION=true
MCP_ALLOWED_HOSTS=127.0.0.1,localhost

HTTP Endpoints

When running in HTTP mode, the following endpoints are available:

• POST /mcp - MCP client-to-server communication
• GET /mcp - Server-to-client notifications (SSE)
• DELETE /mcp - Session termination
• GET /health - Health check endpoint

Session Management

The HTTP transport includes session management for stateful connections. Each client session is identified by a unique session ID that must be included in the mcp-session-id header for subsequent requests.

Usage

Development

npm run dev

This starts the MCP server in development mode with hot reloading.

Production

npm run build
npm start

Docker

The project includes a Dockerfile for containerized deployments. Docker images are automatically built and pushed to GitHub Container Registry (GHCR) during the CI/CD process.

Using Pre-built Images

Pull and run the latest image:

docker run -d \
  --name hevy-mcp \
  -e HEVY_API_KEY=your_api_key_here \
  -p 3000:3000 \
  ghcr.io/chrisdoc/hevy-mcp:latest

# Or using CLI argument for the key (omit env var)
docker run -d \
  --name hevy-mcp \
  -p 3000:3000 \
  ghcr.io/chrisdoc/hevy-mcp:latest \
  hevy-api-key=your_api_key_here

Building Locally

# Build the image
docker build -t hevy-mcp .

# Run the container
docker run -d \
  --name hevy-mcp \
  -e HEVY_API_KEY=your_api_key_here \
  -p 3000:3000 \
  hevy-mcp

# Or with CLI argument
docker run -d \
  --name hevy-mcp \
  -p 3000:3000 \
  hevy-mcp \
  hevy-api-key=your_api_key_here

Docker Compose Example

version: '3.8'
services:
  hevy-mcp:
    image: ghcr.io/chrisdoc/hevy-mcp:latest
    environment:
      - HEVY_API_KEY=your_api_key_here
      - MCP_TRANSPORT=http
      - MCP_HTTP_HOST=0.0.0.0
      - PORT=3000
    ports:
      - "3000:3000"
    restart: unless-stopped

Available Image Tags

• latest - Latest stable release
• main - Latest development build from main branch
• v1.8.8, v1.8, v1 - Semantic version tags for releases

Available MCP Tools

The server implements the following MCP tools for interacting with the Hevy API:

Workout Tools

• get-workouts: Fetch and format workout data
• get-workout: Get a single workout by ID
• create-workout: Create a new workout
• update-workout: Update an existing workout
• get-workout-count: Get the total count of workouts
• get-workout-events: Get workout update/delete events

Routine Tools

• get-routines: Fetch and format routine data
• create-routine: Create a new routine
• update-routine: Update an existing routine
• get-routine-by-id: Get a single routine by ID using direct endpoint

Exercise Template Tools

• get-exercise-templates: Fetch exercise templates
• get-exercise-template: Get a template by ID

Routine Folder Tools

• get-routine-folders: Fetch routine folders
• create-routine-folder: Create a new folder
• get-routine-folder: Get a folder by ID

Webhook Tools

• get-webhook-subscription: Get the current webhook subscription
• create-webhook-subscription: Create a new webhook subscription
• delete-webhook-subscription: Delete the current webhook subscription

Project Structure

hevy-mcp/
├── .env                   # Environment variables (API keys)
├── src/
│   ├── index.ts           # Main entry point
│   ├── tools/             # Directory for MCP tool implementations
│   │   ├── workouts.ts    # Workout-related tools
│   │   ├── routines.ts    # Routine-related tools
│   │   ├── templates.ts   # Exercise template tools
│   │   ├── folders.ts     # Routine folder tools
│   │   └── webhooks.ts    # Webhook subscription tools
│   ├── generated/         # API client (generated code)
│   │   ├── client/        # Kubb-generated client
│   │   │   ├── api/       # API client methods
│   │   │   ├── types/     # TypeScript types
│   │   │   ├── schemas/   # Zod schemas
│   │   │   └── mocks/     # Mock data
│   └── utils/             # Helper utilities
│       ├── formatters.ts  # Data formatting helpers
│       └── validators.ts  # Input validation helpers
├── scripts/               # Build and utility scripts
└── tests/                 # Test suite
    ├── integration/       # Integration tests with real API
    │   └── hevy-mcp.integration.test.ts  # MCP server integration tests

Development Guide

Code Style

This project uses Biome for code formatting and linting:

npm run check

Testing

Run All Tests

To run all tests (unit and integration), use:

npm test

Note: If the HEVY_API_KEY environment variable is set, integration tests will also run. If not, only unit tests will run.

Run Only Unit Tests

To run only unit tests (excluding integration tests):

npx vitest run --exclude tests/integration/**

Or with coverage:

npx vitest run --coverage --exclude tests/integration/**

Run Only Integration Tests

To run only the integration tests (requires a valid HEVY_API_KEY):

npx vitest run tests/integration

Note: The integration tests will fail if the HEVY_API_KEY environment variable is not set. This is by design to ensure that the tests are always run with a valid API key.

GitHub Actions Configuration

For GitHub Actions:

1. Unit tests will always run on every push and pull request
2. Integration tests will only run if the HEVY_API_KEY secret is set in the repository settings

To set up the HEVY_API_KEY secret:

1. Go to your GitHub repository
2. Click on "Settings" > "Secrets and variables" > "Actions"
3. Click on "New repository secret"
4. Set the name to HEVY_API_KEY and the value to your Hevy API key
5. Click "Add secret"

If the secret is not set, the integration tests step will be skipped with a message indicating that the API key is missing.

Generating API Client

The API client is generated from the OpenAPI specification using Kubb:

npm run export-specs
npm run build:client

Kubb generates TypeScript types, API clients, Zod schemas, and mock data from the OpenAPI specification.

License

This project is licensed under the MIT License - see the LICENSE file for details.

Contributing

Contributions are welcome! Please feel free to submit a Pull Request. For major changes, please open an issue first to discuss what you would like to change.

Acknowledgements

• Model Context Protocol for the MCP SDK
• Hevy for their fitness tracking platform and API