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

Note: HTTP transport and Docker images remain deprecated. Smithery deployment now uses the official TypeScript runtime flow (no Docker required), or you can run the server locally via stdio (e.g., npx hevy-mcp). Existing GHCR images remain available but are no longer updated.

Prerequisites

• Node.js (v20 or higher)
• pnpm (via Corepack)
• A Hevy API key

Installation

Run via npx (recommended)

You can launch the server directly without cloning:

HEVY_API_KEY=your_hevy_api_key_here npx -y hevy-mcp

Manual Installation

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

# Install dependencies
corepack use pnpm@10.22.0
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 pnpm 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:

pnpm start -- --hevy-api-key=your_hevy_api_key_here

Transport

Deploy via Smithery (TypeScript runtime)

Smithery can bundle and host hevy-mcp without Docker by importing the exported createServer and configSchema from src/index.ts.

1. Ensure dependencies are installed: pnpm install

2. Launch the Smithery playground locally:

   pnpm run smithery:dev
   

   The CLI will prompt for HEVY_API_KEY, invoke createServer({ config }), and open the Smithery MCP playground.

3. Build the deployable bundle:

   pnpm run smithery:build
   

4. Connect the repository to Smithery and trigger a deployment from their dashboard. Configuration is handled entirely through the exported Zod schema, so no additional smithery.yaml env mapping is required.

hevy-mcp now runs exclusively over stdio, which works seamlessly with MCP-aware clients like Claude Desktop and Cursor. HTTP transport has been removed to simplify deployment.

Usage

Development

pnpm run dev

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

Production

pnpm run build
pnpm start

Docker (deprecated)

Docker-based workflows have been retired so we can focus on the stdio-native experience. The bundled Dockerfile now exits with a clear message to prevent accidental builds, and .dockerignore simply documents the deprecation. Previously published images remain available on GHCR (for example ghcr.io/chrisdoc/hevy-mcp:latest), but they are no longer updated. For the best experience, run the server locally via npx hevy-mcp or your own Node.js runtime.

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:

pnpm run check

Testing

Run All Tests

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

pnpm 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):

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

Or with coverage:

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

Run Only Integration Tests

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

pnpm 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:

pnpm run export-specs
pnpm run build:client

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

Troubleshooting

• Rollup optional dependency missing: If you see an error similar to Cannot find module @rollup/rollup-linux-x64-gnu, set the environment variable ROLLUP_SKIP_NODEJS_NATIVE_BUILD=true before running pnpm run build. This forces Rollup to use the pure JavaScript fallback and avoids the npm optional dependency bug on some Linux runners.

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