Model Context Protocol Server for Home Assistant

A powerful bridge between your Home Assistant instance and Language Learning Models (LLMs), enabling natural language control and monitoring of your smart home devices through the Model Context Protocol (MCP).

Key Features

• Smart Device Control 🎮
  • 💡 Lights: Brightness, color temperature, RGB color
  • 🌡️ Climate: Temperature, HVAC modes, fan modes, humidity
  • 🚪 Covers: Position and tilt control
  • 🔌 Switches: On/off control
  • 🚨 Sensors & Contacts: State monitoring
• Intelligent Organization 🏠
  • Area and floor-based device grouping
  • State monitoring and querying
  • Smart context awareness
• Robust Architecture 🛠️
  • Comprehensive error handling
  • State validation
  • Secure API integration

Prerequisites

• Node.js 20.10.0 or higher
• NPM package manager
• Running Home Assistant instance
• Home Assistant long-lived access token (How to get token)

Installation

Basic Setup

# Clone the repository
git clone https://github.com/jango-blockchained/homeassistant-mcp.git
cd homeassistant-mcp

# Install dependencies
npm install

# Build the project
npm run build

Docker Setup (Recommended)

1. Clone and prepare:

git clone https://github.com/jango-blockchained/homeassistant-mcp.git
cd homeassistant-mcp

2. Configure environment:

NODE_ENV=production
HASS_HOST=your_home_assistant_url
HASS_TOKEN=your_home_assistant_token

3. Launch with Docker Compose:

docker-compose up -d

Configuration

Create a .env file with:

HASS_TOKEN=your_home_assistant_token
HASS_HOST=your_home_assistant_url  # e.g., http://homeassistant.local:8123
PORT=3000  # Optional, defaults to 3000

Development

npm run dev      # Development mode
npm run build    # Build project
npm run start    # Production mode
npx jest --config=jest.config.js  # Run tests

Supported Commands

Common Entity Controls

{
  "tool": "control",
  "command": "turn_on",  // or "turn_off", "toggle"
  "entity_id": "light.living_room"
}

Light Control

{
  "tool": "control",
  "command": "turn_on",
  "entity_id": "light.living_room",
  "brightness": 128,
  "color_temp": 4000,
  "rgb_color": [255, 0, 0]
}

Climate Control

{
  "tool": "control",
  "command": "set_temperature",
  "entity_id": "climate.bedroom",
  "temperature": 22,
  "hvac_mode": "heat",
  "fan_mode": "auto",
  "humidity": 45
}

Cover Control

{
  "tool": "control",
  "command": "set_position",
  "entity_id": "cover.living_room",
  "position": 50,
  "tilt_position": 45
}

Media Player Control

{
  "tool": "control",
  "command": "media_play",  // or "media_pause", "media_stop", "media_next", "media_previous"
  "entity_id": "media_player.living_room",
  "volume_level": 0.5,
  "source": "Spotify",
  "media_content_id": "spotify:playlist:xyz",
  "media_content_type": "playlist"
}

Fan Control

{
  "tool": "control",
  "command": "turn_on",
  "entity_id": "fan.bedroom",
  "percentage": 50,
  "preset_mode": "auto",
  "oscillating": true,
  "direction": "forward"
}

Lock Control

{
  "tool": "control",
  "command": "lock",  // or "unlock"
  "entity_id": "lock.front_door"
}

Vacuum Control

{
  "tool": "control",
  "command": "start",  // or "pause", "stop", "return_to_base", "clean_spot"
  "entity_id": "vacuum.robot",
  "fan_speed": "medium"
}

Scene Control

{
  "tool": "control",
  "command": "turn_on",
  "entity_id": "scene.movie_night"
}

Script Control

{
  "tool": "control",
  "command": "turn_on",
  "entity_id": "script.welcome_home",
  "variables": {
    "brightness": 100,
    "color": "red"
  }
}

Camera Control

{
  "tool": "control",
  "command": "enable_motion_detection",  // or "disable_motion_detection"
  "entity_id": "camera.front_door"
}

Natural Language Integration

Example Commands

• "Turn on the living room lights"
• "Set bedroom temperature to 22 degrees"
• "Is the front door locked?"

Smart Features

• Context awareness across conversations
• Natural parameter interpretation
• Intelligent error prevention
• Multi-device orchestration

Troubleshooting

Common Issues

1. Node.js Version (toSorted is not a function)
   • Solution: Update to Node.js 20.10.0+
2. Connection Issues
   • Verify Home Assistant is running
   • Check HASS_HOST accessibility
   • Validate token permissions
3. Entity Control Issues
   • Verify entity_id exists
   • Check entity domain matches command
   • Ensure parameter values are valid

Project Status

✅ Complete

• Entity, Floor, and Area access
• Device control (Lights, Climate, Covers, Switches, Contacts)
• Basic state management
• Error handling and validation

🚧 In Progress

• Custom prompt testing
• Resource context integration
• Tool organization optimization

Contributing

1. Fork repository
2. Create feature branch
3. Submit pull request

Resources

• MCP Documentation
• Home Assistant Docs
• HA REST API

License

MIT License - See LICENSE file