Home Assistant MCP Server

# Home Assistant MCP Server A [Model Context Protocol (MCP)](https://modelcontextprotocol.io/) server for integrating with [Home Assistant](https://www.home-assistant.io/), allowing LLMs to control and query your smart home. ## Features - Query and control Home Assistant entities via natural language - Works with any MCP-compatible client (like Claude Desktop) - Provides tools for state management, service calls, history, and more - Secure authentication using Home Assistant long-lived access tokens - Multiple transport options (stdio for local processes, SSE for remote clients) - Demo mode with mock data for testing and demonstration when Home Assistant is not available ## Installation ```bash # Install globally using bun bun install -g home-assistant-mcp-server # Or install from source git clone https://github.com/oleander/home-assistant-mcp-server.git cd home-assistant-mcp-server bun install bun run build bun link ``` ## Configuration Create a `.env` file in your current directory with the following variables: ``` # Required configurations HASS_URL=http://your-home-assistant:8123 # URL to your Home Assistant instance HASS_TOKEN=your_long_lived_access_token # Long-lived access token for authentication # Optional configurations PORT=3000 # Port for the HTTP server (default: 3000) HASS_MOCK=false # Enable mock data mode when Home Assistant is unavailable (default: false) ``` ### Environment Variables | Variable | Required | Default | Description | | ------------ | -------- | ------- | ------------------------------------------------------------------------------------------ | | `HASS_URL` | Yes | - | URL to your Home Assistant instance (e.g., http://homeassistant.local:8123) | | `HASS_TOKEN` | Yes | - | Long-lived access token for authenticating with Home Assistant | | `PORT` | No | 3000 | Port number for the HTTP server when using HTTP/SSE transport | | `HASS_MOCK` | No | false | When set to "true", enables mock data mode for testing without a Home Assistant connection | To get a long-lived access token: 1. Log in to your Home Assistant instance 2. Click on your profile (bottom left) 3. Scroll down to "Long-Lived Access Tokens" 4. Create a new token with a descriptive name 5. Copy the token value (you won't see it again) ## Usage ### Running as a standalone server ```bash # Standard mode (requires a running Home Assistant instance) home-assistant-mcp-server # Start with HTTP/SSE transport home-assistant-mcp-server --stdio # Start with stdio transport for direct process communication # Demo mode (with mock data when Home Assistant is unavailable) home-assistant-mcp-server --mock # Start with HTTP/SSE transport and mock data home-assistant-mcp-server --stdio --mock # Start with stdio transport and mock data ``` ### Integration with Claude Desktop To use with Claude Desktop: 1. Edit your Claude Desktop config file: - macOS: `~/Library/Application Support/Claude/claude_desktop_config.json` - Windows: `%APPDATA%\Claude\claude_desktop_config.json` 2. Add the server configuration: ```json { "mcpServers": { "homeassistant": { "command": "home-assistant-mcp-server" "env": { "HASS_URL": "http://your-home-assistant:8123", "HASS_TOKEN": "your_token_here", "HASS_MOCK": "true" } } } } ``` If you have Home Assistant running, simply remove the `--mock` flag and set `HASS_MOCK` to `false`. 3. Restart Claude Desktop ## Available Tools The server exposes several tools for interacting with Home Assistant: - `states` - Query entity states - `lights` - List lights - `light` - Control a light - `service` - Call Home Assistant services - `history` - Retrieve historical entity data - `services` - List available services - `config` - Get Home Assistant configuration - `domains` - List available domains - `error_log` - Get Home Assistant error log - `devices` - Get all devices in Home Assistant For detailed usage examples, see [docs/hass-mcp.md](docs/hass-mcp.md). ## Security This server requires a Home Assistant access token with full access. Consider these security recommendations: - Only run the server on trusted networks - Use HTTPS if exposing the server remotely - Keep your `.env` file secure and don't commit it to source control - Consider using a token with limited permissions when possible ## License This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details.