ha-mcp-bridge

Home Assistant MCP Server

A Model Context Protocol (MCP) server for Home Assistant integration with Claude.ai, built with pure Node.js HTTP for maximum compatibility.

🎉 Features

• Pure Node.js HTTP Architecture - No Express dependencies, matches N8N MCP structure
• Claude.ai Tool Discovery Fix - Implements the prompts/list hack for proper tool discovery
• OAuth 2.1 + PKCE Authentication - Secure authentication flow
• Real Home Assistant Integration - Connect to actual HA instances with API tokens
• 10 Home Assistant Tools:
  • get_entities - Get all HA entities or filter by domain
  • call_service - Call HA services to control devices
  • get_automations - Get all HA automations
  • get_lights - Get all light entities
  • get_switches - Get all switch entities
  • get_climate - Get climate/HVAC entities
  • get_sensors - Get sensor entities
  • control_lights - Control lights with actions, brightness, and color
  • get_temperature_simple - Mock temperature data for testing
  • test_simple - Simple test tool for connection verification
• Token Management - Register and manage API tokens via a dedicated endpoint.

🚀 Quick Start

Option 1: Docker (Recommended)

# Using pre-built images from GitHub Container Registry
docker run -d \
  --name ha-mcp-server \
  -p 3000:3000 \
  -e SERVER_URL=https://your-domain.com \
  -e HA_URL=https://your-ha-instance.com \
  -e HA_TOKEN=your_ha_token \
  -e ADMIN_USERNAME=admin \
  -e ADMIN_PASSWORD=your_secure_password \
  shaikeme/ha-mcp-server:latest

Option 2: Docker Compose

# Clone repository
git clone https://github.com/shaike1/ha-mcp-bridge.git
cd ha-mcp-bridge

# Use pre-built image
docker-compose -f docker-compose.registry.yml up -d

# Or build locally
docker-compose up -d

Option 3: Home Assistant Add-on (HAOS)

1. Add this repository to your Home Assistant add-on store
2. Install "Home Assistant MCP Server" add-on
3. Configure with your public URL and admin password
4. Start the add-on
5. Connect to Claude.ai using the add-on URL

Option 4: Manual Installation

git clone https://github.com/shaike1/ha-mcp-bridge.git
cd ha-mcp-bridge
npm install
npm start

Connect to Claude.ai

1. Add MCP integration in Claude.ai
2. Use your SERVER_URL
3. Authenticate with admin credentials
4. Start controlling Home Assistant with Claude!

🔧 Configuration

Home Assistant Setup

1. Create a Long-Lived Access Token in Home Assistant:

   • Go to Profile → Security → Long-Lived Access Tokens
   • Create new token
   • Copy the token value

2. Ensure your HA instance is accessible from your MCP server

MCP Server Setup

The server requires these environment variables:

PORT=3001
SERVER_URL=https://your-domain.com
ADMIN_USERNAME=admin
ADMIN_PASSWORD=your_secure_password
HA_URL=https://your-ha-instance.com
HA_TOKEN=your_ha_token_here

API Token Management

You can register a new API token using the /tokens/register endpoint:

curl -X POST -H "Content-Type: application/json" \
-d '{"description":"my-new-key","scope":"mcp"}' \
http://localhost:3007/tokens/register

🏗️ Architecture

This MCP server uses pure Node.js HTTP (no Express) to match the architecture of working MCP servers and ensure maximum compatibility with Claude.ai.

Key Components

• OAuth 2.1 + PKCE Flow - Secure authentication
• Claude.ai Compatibility Hacks - Implements workarounds for Claude.ai's non-standard MCP behavior
• Server-Sent Events (SSE) - Real-time tool broadcasting
• Home Assistant API Integration - Direct REST API calls to HA

Claude.ai Compatibility

This server implements several workarounds for Claude.ai's non-standard MCP behavior:

1. prompts/list Hack - Claude.ai only calls prompts/list, never tools/list
2. SSE Tool Broadcasting - Auto-sends tools via Server-Sent Events
3. Transport Declaration - Uses streamable-http transport type

🔒 Security

• OAuth 2.1 with PKCE for secure authentication
• Session-based authentication management
• No hardcoded credentials in code
• Secure token storage and validation

🐛 Troubleshooting

"No tools provided" in Claude.ai

• Ensure OAuth authentication completes successfully
• Check that HA_URL and HA_TOKEN are correct
• Verify Home Assistant is accessible from the MCP server

Connection issues

• Check SERVER_URL matches your actual domain
• Verify SSL certificates are valid
• Ensure port 3001 is accessible

Home Assistant API errors

• Verify HA_TOKEN has proper permissions
• Check Home Assistant logs for API errors
• Ensure HA_URL format is correct (include protocol and port)

📝 License

MIT License - see LICENSE file for details

🤝 Contributing

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Test thoroughly
5. Submit a pull request

🔗 Related Projects

• N8N MCP Server - Similar architecture
• Model Context Protocol - Official MCP documentation

Made with ❤️ for the Home Assistant and Claude.ai communities