Home Assistant MCP server

The Home Assistant MCP Server allows you to control your smart home through the Model Context Protocol, providing a bridge between AI systems and your Home Assistant installation. This server enables natural language control of various home devices like lights, climate controls, locks, and more.

Installation

Prerequisites

Before setting up the MCP server, you need to have Home Assistant installed and running. If you haven't set up Home Assistant yet:

1. Follow the official Home Assistant Getting Started guide
2. Generate a long-lived access token from your Home Assistant instance (needed for API access)

Configuration

Create a .env file in the root directory with the following content:

HOMEASSISTANT_TOKEN=your_long_lived_access_token_here
HOMEASSISTANT_BASE_URL=your_home_assistant_url_here

Example:

HOMEASSISTANT_TOKEN=eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9...
HOMEASSISTANT_BASE_URL=http://homeassistant.local:8123

Setting Up with Claude Desktop

To integrate the MCP server with Claude Desktop, you'll need to modify the Claude Desktop configuration file:

On MacOS: Edit the file at: ~/Library/Application\ Support/Claude/claude_desktop_config.json

On Windows: Edit the file at: %APPDATA%/Claude/claude_desktop_config.json

For Published Server

Add the following to your configuration file:

"mcpServers": {
  "home-assistant-server": {
    "command": "uvx",
    "args": [
      "home-assistant-server"
    ]
  }
}

For Development/Unpublished Server

Add the following to your configuration file:

"mcpServers": {
  "home-assistant-server": {
    "command": "uv",
    "args": [
      "--directory",
      "/path/to/home-assistant-server",
      "run",
      "home-assistant-server"
    ]
  }
}

Usage

Supported Devices and Controls

The MCP server currently supports the following Home Assistant domains:

• Lights: Turn on/off, brightness control
• Climate: Temperature control, HVAC modes
• Locks: Lock/unlock functionality
• Alarm Control Panel: Arm/disarm security systems
• Humidifier: Humidity control

Example Commands

When interacting with Claude or another AI that supports MCP, you can use natural language to control your smart home devices. The MCP server will translate these into the appropriate Home Assistant commands:

• "Turn on the kitchen lights"
• "Set the living room temperature to 72 degrees"
• "Lock the front door"
• "Disarm the security system"
• "Turn off the humidifier in the bedroom"

Available Tools

Behind the scenes, the server implements the following tools:

light-turn_on()
light-turn_off()
climate-turn_on()
climate-turn_off()
alarm_control_panel-disarm()
lock-lock()
lock-unlock()
humidifier-turn_on()
humidifier-turn_off()

These tools are automatically invoked based on your natural language requests to Claude or other MCP-compatible AI systems.

How to install this MCP server

For Claude Code

To add this MCP server to Claude Code, run this command in your terminal:

claude mcp add-json "home-assistant-server" '{"command":"uvx","args":["home-assistant-server"]}'

See the official Claude Code MCP documentation for more details.

For Cursor

There are two ways to add an MCP server to Cursor. The most common way is to add the server globally in the ~/.cursor/mcp.json file so that it is available in all of your projects.

If you only need the server in a single project, you can add it to the project instead by creating or adding it to the .cursor/mcp.json file.

Adding an MCP server to Cursor globally

To add a global MCP server go to Cursor Settings > Tools & Integrations and click "New MCP Server".

When you click that button the ~/.cursor/mcp.json file will be opened and you can add your server like this:

{
    "mcpServers": {
        "home-assistant-server": {
            "command": "uvx",
            "args": [
                "home-assistant-server"
            ]
        }
    }
}

Adding an MCP server to a project

To add an MCP server to a project you can create a new .cursor/mcp.json file or add it to the existing one. This will look exactly the same as the global MCP server example above.

How to use the MCP server

Once the server is installed, you might need to head back to Settings > MCP and click the refresh button.

The Cursor agent will then be able to see the available tools the added MCP server has available and will call them when it needs to.

You can also explicitly ask the agent to use the tool by mentioning the tool name and describing what the function does.

For Claude Desktop

To add this MCP server to Claude Desktop:

1. Find your configuration file:

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

2. Add this to your configuration file:

{
    "mcpServers": {
        "home-assistant-server": {
            "command": "uvx",
            "args": [
                "home-assistant-server"
            ]
        }
    }
}

3. Restart Claude Desktop for the changes to take effect