Model Context Protocol Server for Home Assistant

The server uses the MCP protocol to share access to a local Home Assistant instance with an LLM application.

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). This server provides a comprehensive API for managing your entire Home Assistant ecosystem, from device control to system administration.

Features

🎮 Device Control: Control any Home Assistant device through natural language
🔄 Real-time Updates: Get instant updates through Server-Sent Events (SSE)
🤖 Automation Management: Create, update, and manage automations
📊 State Monitoring: Track and query device states
🔐 Secure: Token-based authentication and rate limiting
📱 Mobile Ready: Works with any HTTP-capable client

Real-time Updates with SSE

The server includes a powerful Server-Sent Events (SSE) system that provides real-time updates from your Home Assistant instance. This allows you to:

🔄 Get instant state changes for any device
📡 Monitor automation triggers and executions
🎯 Subscribe to specific domains or entities
📊 Track service calls and script executions

Quick SSE Example

server.ts

const eventSource = new EventSource(
  'http://localhost:3000/subscribe_events?token=YOUR_TOKEN&domain=light'
);

eventSource.onmessage = (event) => {
  const data = JSON.parse(event.data);
  console.log('Update received:', data);
};

See SSE_API.md for complete documentation of the SSE system.

Key Features
Prerequisites
Installation
- Basic Setup
- Docker Setup (Recommended)
Configuration
Development
API Reference
Natural Language Integration
Troubleshooting
Project Status
Contributing
Resources
License

Key Features

Core Functionality 🎮

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
- 🎵 Media Players: Playback control, volume, source selection
- 🌪️ Fans: Speed, oscillation, direction
- 🔒 Locks: Lock/unlock control
- 🧹 Vacuums: Start, stop, return to base
- 📹 Cameras: Motion detection, snapshots

System Management 🛠️

Add-on Management
- Browse available add-ons
- Install/uninstall add-ons
- Start/stop/restart add-ons
- Version management
- Configuration access
Package Management (HACS)
- Integration with Home Assistant Community Store
- Multiple package types support:
  - Custom integrations
  - Frontend themes
  - Python scripts
  - AppDaemon apps
  - NetDaemon apps
- Version control and updates
- Repository management
Automation Management
- Create and edit automations
- Advanced configuration options:
  - Multiple trigger types
  - Complex conditions
  - Action sequences
  - Execution modes
- Duplicate and modify existing automations
- Enable/disable automation rules
- Trigger automation manually

Architecture Features 🏗️

Intelligent Organization
- Area and floor-based device grouping
- State monitoring and querying
- Smart context awareness
- Historical data access
Robust Architecture
- Comprehensive error handling
- State validation
- Secure API integration
- TypeScript type safety
- Extensive test coverage

Prerequisites

Node.js 20.10.0 or higher
NPM package manager
Docker Compose for containerization
Running Home Assistant instance
Home Assistant long-lived access token (How to get token)
HACS installed for package management features
Supervisor access for add-on management

Installation

Basic Setup

bash

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

# Install dependencies
npm install

# Build the project
npm run build

Docker Setup (Recommended)

The project includes Docker support for easy deployment and consistent environments across different platforms.

Clone the repository:

bash

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

Configure environment:

bash

cp .env.example .env

Edit the .env file with your Home Assistant configuration:

env

# Home Assistant Configuration
HASS_HOST=http://homeassistant.local:8123
HASS_TOKEN=your_home_assistant_token
HASS_SOCKET_URL=ws://homeassistant.local:8123/api/websocket

# Server Configuration
PORT=3000
NODE_ENV=production
DEBUG=false

Build and run with Docker Compose:

bash

# Build and start the containers
docker compose up -d

# View logs
docker compose logs -f

# Stop the service
docker compose down

Verify the installation: The server should now be running at http://localhost:3000. You can check the health endpoint at http://localhost:3000/health.

Update the application:

bash

# Pull the latest changes
git pull

# Rebuild and restart the containers
docker compose up -d --build

Docker Configuration

The Docker setup includes:

Multi-stage build for optimal image size
Health checks for container monitoring
Volume mounting for environment configuration
Automatic container restart on failure
Exposed port 3000 for API access

Docker Compose Environment Variables

All environment variables can be configured in the .env file. The following variables are supported:

HASS_HOST: Your Home Assistant instance URL
HASS_TOKEN: Long-lived access token for Home Assistant
HASS_SOCKET_URL: WebSocket URL for Home Assistant
PORT: Server port (default: 3000)
NODE_ENV: Environment (production/development)
DEBUG: Enable debug mode (true/false)

Configuration

Environment Variables

env

# Home Assistant Configuration
HASS_HOST=http://homeassistant.local:8123  # Your Home Assistant instance URL
HASS_TOKEN=your_home_assistant_token       # Long-lived access token
HASS_SOCKET_URL=ws://homeassistant.local:8123/api/websocket  # WebSocket URL

# Server Configuration
PORT=3000                # Server port (default: 3000)
NODE_ENV=production     # Environment (production/development)
DEBUG=false            # Enable debug mode

# Test Configuration
TEST_HASS_HOST=http://localhost:8123  # Test instance URL
TEST_HASS_TOKEN=test_token           # Test token

Configuration Files

Development: Copy .env.example to .env.development
Production: Copy .env.example to .env.production
Testing: Copy .env.example to .env.test

Adding to Claude Desktop (or other clients)

To use your new Home Assistant MCP server, you can add Claude Desktop as a client. Add the following to the configuration. Note this will run the MCP within claude and does not work with the Docker method.

JSON Config

{
  "homeassistant": {
    "command": "node",
    "args": [<path/to/your/dist/folder>]
    "env": {
      NODE_ENV=development
      HASS_HOST=http://homeassistant.local:8123
      HASS_TOKEN=your_home_assistant_token
      PORT=3000
      HASS_SOCKET_URL=ws://homeassistant.local:8123/api/websocket
      LOG_LEVEL=debug
    }
  }
}

API Reference

Device Control

Common Entity Controls

config.json

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

Light Control

config.json

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

Add-on Management

List Available Add-ons

config.json

{
  "tool": "addon",
  "action": "list"
}

Install Add-on

config.json

{
  "tool": "addon",
  "action": "install",
  "slug": "core_configurator",
  "version": "5.6.0"
}

Manage Add-on State

config.json

{
  "tool": "addon",
  "action": "start",  // or "stop", "restart"
  "slug": "core_configurator"
}

Package Management

List HACS Packages

config.json

{
  "tool": "package",
  "action": "list",
  "category": "integration"  // or "plugin", "theme", "python_script", "appdaemon", "netdaemon"
}

Install Package

config.json

{
  "tool": "package",
  "action": "install",
  "category": "integration",
  "repository": "hacs/integration",
  "version": "1.32.0"
}

Automation Management

Create Automation

config.json

{
  "tool": "automation_config",
  "action": "create",
  "config": {
    "alias": "Motion Light",
    "description": "Turn on light when motion detected",
    "mode": "single",
    "trigger": [
      {
        "platform": "state",
        "entity_id": "binary_sensor.motion",
        "to": "on"
      }
    ],
    "action": [
      {
        "service": "light.turn_on",
        "target": {
          "entity_id": "light.living_room"
        }
      }
    ]
  }
}

Duplicate Automation

config.json

{
  "tool": "automation_config",
  "action": "duplicate",
  "automation_id": "automation.motion_light"
}

Core Functions

State Management

http

GET /api/state
POST /api/state

Manages the current state of the system.

Example Request:

json

POST /api/state
{
  "context": "living_room",
  "state": {
    "lights": "on",
    "temperature": 22
  }
}

Context Updates

http

POST /api/context

Updates the current context with new information.

Example Request:

json

POST /api/context
{
  "user": "john",
  "location": "kitchen",
  "time": "morning",
  "activity": "cooking"
}

Action Endpoints

Execute Action

http

POST /api/action

Executes a specified action with given parameters.

Example Request:

json

POST /api/action
{
  "action": "turn_on_lights",
  "parameters": {
    "room": "living_room",
    "brightness": 80
  }
}

Batch Actions

http

POST /api/actions/batch

Executes multiple actions in sequence.

Example Request:

json

POST /api/actions/batch
{
  "actions": [
    {
      "action": "turn_on_lights",
      "parameters": {
        "room": "living_room"
      }
    },
    {
      "action": "set_temperature",
      "parameters": {
        "temperature": 22
      }
    }
  ]
}

Query Functions

Get Available Actions

http

GET /api/actions

Returns a list of all available actions.

Example Response:

config.json

{
  "actions": [
    {
      "name": "turn_on_lights",
      "parameters": ["room", "brightness"],
      "description": "Turns on lights in specified room"
    },
    {
      "name": "set_temperature",
      "parameters": ["temperature"],
      "description": "Sets temperature in current context"
    }
  ]
}

Context Query

http

GET /api/context?type=current

Retrieves context information.

Example Response:

config.json

{
  "current_context": {
    "user": "john",
    "location": "kitchen",
    "time": "morning",
    "activity": "cooking"
  }
}

WebSocket Events

The server supports real-time updates via WebSocket connections.

server.ts

// Client-side connection example
const ws = new WebSocket('ws://localhost:3000/ws');

ws.onmessage = (event) => {
  const data = JSON.parse(event.data);
  console.log('Received update:', data);
};

Supported Events

state_change: Emitted when system state changes
context_update: Emitted when context is updated
action_executed: Emitted when an action is completed
error: Emitted when an error occurs

Example Event Data:

config.json

{
  "event": "state_change",
  "data": {
    "previous_state": {
      "lights": "off"
    },
    "current_state": {
      "lights": "on"
    },
    "timestamp": "2024-03-20T10:30:00Z"
  }
}

Error Handling

All endpoints return standard HTTP status codes:

200: Success
400: Bad Request
401: Unauthorized
403: Forbidden
404: Not Found
500: Internal Server Error

Error Response Format:

config.json

{
  "error": {
    "code": "INVALID_PARAMETERS",
    "message": "Missing required parameter: room",
    "details": {
      "missing_fields": ["room"]
    }
  }
}

Rate Limiting

The API implements rate limiting to prevent abuse:

100 requests per minute per IP for regular endpoints
1000 requests per minute per IP for WebSocket connections

When rate limit is exceeded, the server returns:

config.json

{
  "error": {
    "code": "RATE_LIMIT_EXCEEDED",
    "message": "Too many requests",
    "reset_time": "2024-03-20T10:31:00Z"
  }
}

Example Usage

Using curl

bash

# Get current state
curl -X GET \
  http://localhost:3000/api/state \
  -H 'Authorization: ApiKey your_api_key_here'

# Execute action
curl -X POST \
  http://localhost:3000/api/action \
  -H 'Authorization: ApiKey your_api_key_here' \
  -H 'Content-Type: application/json' \
  -d '{
    "action": "turn_on_lights",
    "parameters": {
      "room": "living_room",
      "brightness": 80
    }
  }'

Using JavaScript

server.ts

// Execute action
async function executeAction() {
  const response = await fetch('http://localhost:3000/api/action', {
    method: 'POST',
    headers: {
      'Authorization': 'ApiKey your_api_key_here',
      'Content-Type': 'application/json'
    },
    body: JSON.stringify({
      action: 'turn_on_lights',
      parameters: {
        room: 'living_room',
        brightness: 80
      }
    })
  });
  
  const data = await response.json();
  console.log('Action result:', data);
}

Development

bash

# Development mode with hot reload
npm run dev

# Build project
npm run build

# Production mode
npm run start

# Run tests
npx jest --config=jest.config.cjs

# Run tests with coverage
npx jest --coverage

# Lint code
npm run lint

# Format code
npm run format

Troubleshooting

Common Issues

Node.js Version (toSorted is not a function)
- Solution: Update to Node.js 20.10.0+
bash
```
nvm install 20.10.0
nvm use 20.10.0
```
Connection Issues
- Verify Home Assistant is running
- Check HASS_HOST accessibility
- Validate token permissions
- Ensure WebSocket connection for real-time updates
Add-on Management Issues
- Verify Supervisor access
- Check add-on compatibility
- Validate system resources
HACS Integration Issues
- Verify HACS installation
- Check HACS integration status
- Validate repository access
Automation Issues
- Verify entity availability
- Check trigger conditions
- Validate service calls
- Monitor execution logs

Project Status

✅ Complete

Entity, Floor, and Area access
Device control (Lights, Climate, Covers, Switches, Contacts)
Add-on management system
Package management through HACS
Advanced automation configuration
Basic state management
Error handling and validation
Docker containerization
Jest testing setup
TypeScript integration
Environment variable management
Home Assistant API integration
Project documentation

🚧 In Progress

WebSocket implementation for real-time updates
Enhanced security features
Tool organization optimization
Performance optimization
Resource context integration
API documentation generation
Multi-platform desktop integration
Advanced error recovery
Custom prompt testing
Enhanced macOS integration
Type safety improvements
Testing coverage expansion

Contributing

Fork the repository
Create a feature branch
Implement your changes
Add tests for new functionality
Ensure all tests pass
Submit a pull request

Resources

License

MIT License - See LICENSE file

Model Context Protocol Server for Home Assistant

Features

Real-time Updates with SSE

Quick SSE Example

Table of Contents

Key Features

Core Functionality 🎮

System Management 🛠️

Architecture Features 🏗️

Prerequisites

Installation

Basic Setup

Docker Setup (Recommended)

Docker Configuration

Docker Compose Environment Variables

Configuration

Environment Variables

Configuration Files

Adding to Claude Desktop (or other clients)

API Reference

Device Control

Common Entity Controls

Light Control

Add-on Management

List Available Add-ons

Install Add-on

Manage Add-on State

Package Management

List HACS Packages

Install Package

Automation Management

Create Automation

Duplicate Automation

Core Functions

State Management

Context Updates

Action Endpoints

Execute Action

Batch Actions

Query Functions

Get Available Actions

Context Query

WebSocket Events

Supported Events

Error Handling

Rate Limiting

Example Usage

Using curl

Using JavaScript

Development

Troubleshooting

Common Issues

Project Status

Contributing

Resources

License