Home Assistant MCP
A Model Context Protocol (MCP) integration for controlling Home Assistant devices using AI assistants.
Overview
This MCP allows AI assistants to control your Home Assistant devices. It provides tools to:
- Search for entities in your Home Assistant instance
- Control devices (turn them on/off)
- Control light colors and brightness
Prerequisites
- Python 3.11 or higher
- Home Assistant instance running and accessible via API
- Home Assistant Long-Lived Access Token
Installation
Installing via Smithery
To install Home Assistant Integration for Claude Desktop automatically via Smithery:
npx -y @smithery/cli install @hpohlmann/home-assistant-mcp --client claude
Manual Installation
- Clone this repository
- Set up a Python environment:
cd home-assistant
python -m venv .venv
source .venv/bin/activate # On Windows: .venv\Scripts\activate
pip install -U pip
pip install uv
uv pip install -e .
Configuration
Get a Home Assistant Long-Lived Access Token
- Go to your Home Assistant instance
- Navigate to your profile (click on your username in the sidebar)
- Scroll down to "Long-Lived Access Tokens"
- Create a new token with a descriptive name like "MCP Integration"
- Copy the token (you'll only see it once)
Set up in Cursor AI
Add the following configuration to your MCP configuration in Cursor:
{
"mcpServers": {
"home_assistant": {
"command": "uv",
"args": [
"--directory",
"/path/to/your/home-assistant-mcp",
"run",
"main.py"
],
"env": {
"HOME_ASSISTANT_TOKEN": "your_home_assistant_token_here"
},
"inheritEnv": true
}
}
}
Replace:
/path/to/your/home-assistantwith the actual path to this directoryyour_home_assistant_token_herewith your Home Assistant Long-Lived Access Token
Home Assistant URL Configuration
By default, the MCP tries to connect to Home Assistant at http://homeassistant.local:8123.
If your Home Assistant is at a different URL, you can modify the HA_URL variable in app/config.py.
Usage
Once configured, you can use Cursor AI to control your Home Assistant devices:
- Search for devices: "Find my living room lights"
- Control devices: "Turn on the kitchen light"
- Control light colors: "Set my living room lights to red"
- Adjust brightness: "Set my dining room lights to blue at 50% brightness"
Light Control Features
The MCP now supports advanced light control capabilities:
-
Color Control: Set any RGB color for compatible lights
- Specify colors using RGB values (0-255 for each component)
- Example:
set_device_color("light.living_room", 255, 0, 0)for red
-
Brightness Control: Adjust light brightness
- Optional brightness parameter (0-255)
- Can be combined with color changes
- Example:
set_device_color("light.dining_room", 0, 0, 255, brightness=128)for medium-bright blue
Troubleshooting
- If you get authentication errors, verify your token is correct and has not expired
- Check that your Home Assistant instance is reachable at the configured URL
- For color control issues:
- Verify that your light entity supports RGB color control
- Check that the light is turned on before attempting to change colors
Future Capabilities
Dynamic Entity Exposure
The current implementation requires a two-step process to control devices:
- Search for entities using natural language
- Control the entity using its specific entity_id
A planned enhancement is to create a more dynamic way to expose entities to the control devices tool, allowing the AI to:
- Directly control devices through more natural commands (e.g., "turn off the kitchen lights")
- Cache frequently used entities for faster access
- Support more complex operations like adjusting brightness, temperature, or other attributes
- Handle entity groups and scenes more intuitively
This would significantly reduce the time to action and create a more seamless user experience when controlling Home Assistant devices through an AI assistant.