homeassistant-mcp 3.0.3

Home Assistant MCP Server using FastMCP

Home Assistant MCP Server

A Model Context Protocol (MCP) server that lets AI assistants control Home Assistant. Built with Python and FastMCP.

Works with Claude, GPT-4, Cursor, Kiro, and any MCP-compatible client.

What it does

• 40+ tools covering lights, climate, covers, locks, media players, vacuums, fans, cameras, alarms, and more
• MCP Resources for read-only entity, area, device, and service data
• MCP Prompts for guided workflows (automation creation, troubleshooting, energy optimization)
• REST API tools for events, services, states, history, logbook, templates, calendars, and config validation
• Async throughout with TTL-based caching to reduce API load

Installation

uvx (recommended)

No install needed. Just configure your MCP client:

{
  "mcpServers": {
    "homeassistant": {
      "command": "uvx",
      "args": ["homeassistant-mcp"],
      "env": {
        "HASS_HOST": "http://homeassistant.local:8123",
        "HASS_TOKEN": "your_long_lived_access_token_here"
      }
    }
  }
}

pip

pip install homeassistant-mcp
homeassistant-mcp

From source

git clone https://github.com/robbrad/homeassistant-mcp.git
cd homeassistant-mcp
python -m venv venv
source venv/bin/activate  # Windows: venv\Scripts\activate
pip install -e ".[dev]"
homeassistant-mcp

Configuration

The server needs two environment variables:

Variable	Description
HASS_HOST	Home Assistant URL, e.g. http://homeassistant.local:8123
HASS_TOKEN	Long-lived access token (how to create one)

Optional:

Variable	Default	Description
CACHE_TTL_STATES	30	Cache TTL for bulk state queries (seconds)
CACHE_TTL_ENTITY	10	Cache TTL for individual entity queries (seconds)
LOG_LEVEL	INFO	Logging level

These can be set via environment variables (as shown in the MCP client configs above) or in a .env file. See .env.example.

MCP Client Setup

Claude Desktop

Add to your config file:

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

{
  "mcpServers": {
    "homeassistant": {
      "command": "uvx",
      "args": ["homeassistant-mcp"],
      "env": {
        "HASS_HOST": "http://homeassistant.local:8123",
        "HASS_TOKEN": "your_token_here"
      }
    }
  }
}

Cursor / Kiro / Other MCP Clients

Same config format. Place it in your client's MCP configuration file (e.g. .cursor/mcp.json, .kiro/settings/mcp.json).

The server uses stdio transport, which is the standard for MCP.

Supported Domains

Domain	Tool	Capabilities
Light	lights_control	Brightness, color temp, RGB
Climate	climate_control	HVAC modes, temperature, fan
Switch	switch_control	On/off, bulk operations
Cover	cover_control	Position, tilt, open/close
Lock	lock_control	Lock/unlock with codes
Media Player	media_player_control	Playback, volume, source
Camera	camera_control	Snapshots, streams, motion
Vacuum	vacuum_control	Start, dock, fan speed
Fan	fan_control	Speed, oscillation, direction
Script	script_control	Execute with variables
Scene	scene_control	Activate scenes
Automation	automation_control	Trigger, enable, disable
Alarm	alarm_control	Arm/disarm modes
Weather	weather_control	Conditions, forecasts
Input Helpers	input_*_control	Booleans, numbers, selects, text, datetime
Water Heater	water_heater_control	Temperature, modes
Humidifier	humidifier_control	Humidity levels
Siren	siren_control	Activation control
Valve	valve_control	Open/close
Lawn Mower	lawn_mower_control	Start, stop, dock
Devices	list_devices	Filter by domain, area, floor
Notifications	send_notification	Send alerts
History	query_history	Historical state data
Generic	call_service	Call any HA service

REST API Tools

Tool	Description
api_info	API status, config, components
events_control	List and fire events
services_control	List and call services
states_control	CRUD on entity states
history_query	History with filtering
logbook_query	Logbook entries
error_log_get	Error log retrieval
camera_proxy_get	Camera images with resize
calendar_access	Calendar events
template_render	Render HA templates
config_check	Validate configuration
intent_handle	Process intents

Publishing to PyPI

Build and upload:

pip install build twine
python -m build
twine upload dist/*

After publishing, users can install with pip install homeassistant-mcp or run directly with uvx homeassistant-mcp.

Development

git clone https://github.com/robbrad/homeassistant-mcp.git
cd homeassistant-mcp
python -m venv venv
source venv/bin/activate
pip install -e ".[dev]"

# Run tests
pytest

# Format and lint
black src/ tests/
ruff check src/ tests/

# Type check
mypy src/

Architecture

AI Assistant  <-->  MCP Server (FastMCP/stdio)  <-->  Home Assistant REST API
                         |
                   +-----+-----+
                   |           |
                 Tools      Cache
                 Layer      Layer

• FastMCP Server handles MCP protocol over stdio
• Home Assistant Client is an async httpx client with auth
• Cache Layer provides TTL-based caching for states
• Tools Layer contains individual tool implementations per domain

License

MIT