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 like Claude Desktop and Cursor to access and manage workout data, routines, and exercise templates through the Hevy API (requires PRO subscription).

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📋 Table of Contents

• Features
• Quick Start
• Prerequisites
• Installation
  • Claude Desktop Configuration
  • Cursor Configuration
• Why hevy-mcp?
• Configuration
• Available MCP Tools
• Development & Contributing

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🚀 Features

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

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🏁 Quick Start

Pick the workflow that fits your setup:

Scenario	Command	Requirements
One-off stdio run	HEVY_API_KEY=sk_live... npx -y hevy-mcp	Node.js ≥ 26, Hevy API key
Local development	npm install && npm run build && npm start	.env with HEVY_API_KEY

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🛠️ Prerequisites

• Node.js: v26 or higher (strongly recommended to use the exact version pinned in .nvmrc).
• npm: v10 or higher.
• Hevy API key: Required for all operations (available with Hevy PRO).

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📦 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
npm install

# Create .env and add your keys
cp .env.sample .env
# Edit .env and add your HEVY_API_KEY

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🔗 Integration

Claude Desktop Configuration

To use this server with Claude Desktop, add the following to your claude_desktop_config.json:

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

{
	"mcpServers": {
		"hevy-mcp": {
			"command": "npx",
			"args": ["-y", "hevy-mcp"],
			"env": {
				"HEVY_API_KEY": "sk_live_your_key_here"
			}
		}
	}
}

Cursor Configuration

Add this server under "mcpServers" in ~/.cursor/mcp.json:

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

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✨ Why hevy-mcp?

• 🚀 High Performance: Built with the Oxc toolchain (oxlint/oxfmt) for near-instant linting and formatting.
• 🛡️ Type Safety: Fully type-safe implementation using Zod and Kubb-generated API clients.
• 📉 Observability: Built-in Sentry monitoring for error tracking, lifecycle and tool tracing, and stdio parse diagnostics.
• ⚡ Optimized: Includes in-memory caching for exercise templates to reduce API latency.

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⚙️ Configuration

Supply your Hevy API key via:

1. Environment Variable: HEVY_API_KEY (in .env or system environment).
2. CLI Argument: --hevy-api-key=your_key (after -- in npm scripts).

# Example .env
HEVY_API_KEY=your_hevy_api_key_here

📡 Sentry Monitoring

hevy-mcp includes Sentry monitoring to observe errors and usage in production. It initializes @sentry/node with tracing enabled and PII collection disabled by default. Recent observability changes also add:

• lifecycle spans around server build, run, and stdio connect
• per-tool execution spans plus captured handler exceptions
• stdio parse diagnostics, including leading UTF-8 BOM stripping and invalid JSON context
• a deterministic pseudonymous Sentry user ID derived from HEVY_API_KEY, so the raw key is never sent to Sentry

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⚠️ Deprecation Notices (HTTP/SSE & Docker)

Stdio Only

As of version 1.18.0, hevy-mcp only supports stdio transport. HTTP/SSE transport has been completely removed to simplify the codebase and focus on the native MCP experience.

Docker

Docker-based workflows are retired. The provided Dockerfile now exits with a message pointing to the stdio-native experience. Legacy GHCR images are no longer updated.

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🛠️ Available MCP Tools

Category	Tools
Workouts	get-workouts, get-workout, create-workout, update-workout, get-workout-count, get-workout-events
Routines	get-routines, get-routine, create-routine, update-routine
Templates	get-exercise-templates, get-exercise-template, search-exercise-templates, create-exercise-template, get-exercise-history
Folders	get-routine-folders, get-routine-folder, create-routine-folder
Body Measurements	get-body-measurements, get-body-measurement, create-body-measurement, update-body-measurement
User	get-user-info
Webhooks	get-webhook-subscription, create-webhook-subscription, delete-webhook-subscription

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👨‍💻 Development & Contributing

Quick Commands

• Build: npm run build
• Lint/Format: npm run check (uses oxlint/oxfmt)
• Unit Tests: npx vitest run --exclude tests/integration/**
• Full Test Suite: npm test (requires HEVY_API_KEY)

For a detailed senior engineer guide, please refer to AGENTS.md.

API Client Generation

The API client is automatically generated from the OpenAPI spec using Kubb:

npm run build:client

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📄 License & Acknowledgements

• License: MIT
• Credits: Model Context Protocol, Hevy Fitness.

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Contributions are welcome! Please open an issue or PR for any major changes.