Hevy Server

A Model Context Protocol (MCP) server that provides AI assistants with access to the Hevy fitness tracking API. This allows you to log workouts, manage routines, browse exercises, and track your fitness progress directly through AI chat interfaces.

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🏋️ Features

This MCP server provides comprehensive access to Hevy's fitness tracking capabilities:

Workouts

• get_workouts - Browse your workout history (paginated)
• get_workout - Get detailed information about a specific workout
• create_workout - Log a new workout with exercises, sets, weights, and reps
• update_workout - Update an existing workout
• get_workouts_count - Get total number of workouts logged
• get_workout_events - Get workout change events (updates/deletes) since a date for syncing

Routines

• get_routines - List your workout routines
• get_routine - Get details of a specific routine
• create_routine - Create a new workout routine template
• update_routine - Update an existing routine

Exercises

• get_exercise_templates - Browse available exercises (includes both Hevy's library and your custom exercises)
• get_exercise_template - Get detailed information about a specific exercise template
• create_exercise_template - Create a custom exercise template
• get_exercise_history - View your performance history for a specific exercise

Organization

• get_routine_folders - List your routine folders for organization
• get_routine_folder - Get details of a specific routine folder
• create_routine_folder - Create a new routine folder

🚀 Quick Start

Prerequisites

1. Hevy Pro subscription - The Hevy API is only available to Pro users
2. Hevy API Key - Get yours at https://hevy.com/settings?developer
3. Cloudflare account - For deploying the MCP server

Deploy to Cloudflare Workers

1. Clone this repository:

git clone https://github.com/tomtorggler/hevy-mcp-server.git
cd hevy-mcp-server

2. Install dependencies:

npm install

3. Set your Hevy API key as a secret:

npx wrangler secret put HEVY_API_KEY
# Paste your API key when prompted

4. Deploy to Cloudflare:

npm run deploy

Your MCP server will be available at: https://hevy-mcp-server.<your-account>.workers.dev/mcp

Local Development

Run the server locally:

npm run dev

The server will be available at: http://localhost:8787/mcp

🔌 Connect to AI Clients

Claude Desktop

To connect from Claude Desktop, edit your config file (Settings > Developer > Edit Config):

{
  "mcpServers": {
    "hevy": {
      "command": "npx",
      "args": [
        "mcp-remote",
        "https://hevy-mcp-server.<your-account>.workers.dev/mcp"
      ]
    }
  }
}

Restart Claude Desktop and you'll see the Hevy tools available.

Cloudflare AI Playground

1. Go to https://playground.ai.cloudflare.com/
2. Enter your deployed MCP server URL
3. Start using Hevy tools directly from the playground!

📖 Usage Examples

Creating a Workout

Once connected, you can ask your AI assistant to log workouts:

"Log a workout from today at 10am to 11am. I did bench press: 3 sets of 100kg for 10 reps, and squats: 4 sets of 120kg for 8 reps."

The assistant will:

1. Use get_exercise_templates to find the exercise IDs
2. Call create_workout with the proper structure
3. Confirm the workout was logged successfully

Viewing Progress

"Show me my last 5 workouts"

"What's my exercise history for deadlifts?"

"Get all workout changes since January 1st, 2024"

The assistant will use get_workout_events to sync recent changes.

Managing Routines

"Create a new Push Day routine with bench press (4 sets of 8-12 reps at 100kg) and overhead press (3 sets of 10 reps at 60kg)"

The assistant will use the repRange field for exercises with rep ranges like "8-12 reps".

"Update my Upper Body routine to add pull-ups"

The assistant will use update_routine to modify existing routines.

Creating Custom Exercises

"Create a custom exercise called 'Tom's Special Cable Flyes' for chest using the cable machine"

The assistant will use create_exercise_template with the appropriate muscle groups and equipment category.

Organizing Routines

"Create a new folder called 'Summer 2024 Programs'"

The assistant will use create_routine_folder to organize your routines.

🔧 API Details

Workout Structure

When creating workouts, you can specify:

• title - Name of the workout (required)
• startTime - When the workout started (required, ISO 8601 format)
• endTime - When the workout ended (required, ISO 8601 format)
• routineId - Optional routine ID this workout belongs to
• description - Optional workout description
• isPrivate - Whether the workout is private (optional, default: false)
• exercises - Array of exercises, each with:
  • title - Exercise name from the template (required)
  • exerciseTemplateId - Get this from get_exercise_templates (required)
  • supersetId - Optional superset ID (null if not in a superset)
  • notes - Optional notes for this exercise
  • sets - Array of set data with:
    • type - "warmup", "normal", "failure", or "dropset" (optional)
    • weightKg - Weight in kilograms (optional)
    • reps - Number of repetitions (optional)
    • distanceMeters - For cardio exercises (optional)
    • durationSeconds - For timed exercises (optional)
    • customMetric - Custom metric for steps/floors (optional)
    • rpe - Rating of Perceived Exertion, 6-10 (optional)

Note: The index field for exercises and sets is automatically generated based on their position in the array.

Routine Structure

When creating routines, you can specify:

• title - Name of the routine (required)
• folderId - Optional folder ID (null for default "My Routines" folder)
• notes - Optional notes for the routine
• exercises - Array of exercises, each with:
  • exerciseTemplateId - Get this from get_exercise_templates (required)
  • supersetId - Optional superset ID (null if not in a superset)
  • restSeconds - Rest time in seconds between sets (optional)
  • notes - Optional notes for this exercise
  • sets - Array of set data with:
    • type - "warmup", "normal", "failure", or "dropset" (optional)
    • weightKg - Weight in kilograms (optional)
    • reps - Number of repetitions (optional)
    • repRange - Rep range object with start and end (optional, e.g., 8-12 reps)
    • distanceMeters - For cardio exercises (optional)
    • durationSeconds - For timed exercises (optional)
    • customMetric - Custom metric for steps/floors (optional)

Important: Unlike workouts, routines do NOT use index or title fields in exercises/sets. These are generated by the API.

Time Format

All timestamps use ISO 8601 format:

2024-10-15T10:00:00Z

📚 Resources

• Hevy API Documentation - Official API docs
• MCP Documentation - Learn about Model Context Protocol
• Hevy App - The Hevy fitness tracking app

🛠️ Development

Project Structure

hevy-mcp-server/
├── src/
│   ├── index.ts          # MCP server implementation with tool definitions
│   └── lib/
│       └── client.ts     # Hevy API client wrapper
├── api.json              # OpenAPI specification for Hevy API
├── wrangler.jsonc        # Cloudflare Workers configuration
└── package.json

Adding New Tools

To add new Hevy API capabilities:

1. Add the API method to src/lib/client.ts
2. Define the tool in src/index.ts inside the init() method
3. Use Zod for input validation
4. Handle errors gracefully

Example:

this.server.tool(
  "tool_name",
  {
    param: z.string().describe("Parameter description"),
  },
  async ({ param }) => {
    try {
      const result = await this.client.someMethod(param);
      return {
        content: [{
          type: "text",
          text: JSON.stringify(result, null, 2)
        }]
      };
    } catch (error) {
      return {
        content: [{
          type: "text",
          text: `Error: ${error instanceof Error ? error.message : "Unknown error"}`
        }]
      };
    }
  }
);

🤝 Contributing

Contributions are welcome!

How to Contribute

1. Fork the repository and create your branch from main
2. Make your changes - add features, fix bugs, or improve documentation
3. Test your changes - run npm test and npm run type-check
4. Follow the code style - run npm run format and npm run lint:fix
5. Submit a Pull Request with a clear description of your changes

Development Setup

# Clone your fork
git clone https://github.com/tomtorggler/hevy-mcp-server.git
cd hevy-mcp-server

# Install dependencies
npm install

# Copy environment variables template
cp .dev.vars.example .dev.vars
# Add your Hevy API key to .dev.vars

# Start development server
npm start

# Run tests
npm test

Areas for Contribution

• Add more Hevy API endpoints
• Improve error handling and validation
• Add more comprehensive tests
• Improve documentation and examples
• Report bugs or suggest features via Issues

📝 License

Unlicense - see LICENSE file for details.

This project is not affiliated with Hevy. Hevy is a trademark of Hevy Studios Inc.