Home Assistant

What is Hass-MCP?

Hass-MCP (Home Assistant Model Context Protocol Server) is a Python-based server that integrates AI assistants like Claude with your Home Assistant instance. It acts as a bridge, allowing large language models (LLMs) to interact directly with your smart home devices, query their states, control them, and even assist with automation tasks.

How to use Hass-MCP?

Hass-MCP can be installed using Docker (recommended) or Python 3.13+ with uv. For Docker, pull the voska/hass-mcp:latest image. Integration with AI clients like Claude Desktop, Cursor, and Claude Code (CLI) involves adding specific configurations that point to the Hass-MCP server, including your Home Assistant URL and a long-lived access token. The configuration typically involves setting environment variables for HA_URL and HA_TOKEN within the client's MCP server settings.

Key Features of Hass-MCP

• Entity Management: Query device states, control lights, switches, and other entities, and search for specific entities.
• Domain Summaries: Obtain high-level information about different entity types within Home Assistant.
• Automation Support: List and control existing automations, and receive assistance in creating new ones.
• Guided Conversations: Utilize pre-defined prompts for common tasks, such as creating automations or troubleshooting entities.
• Smart Search: Efficiently find entities by name, type, or state.
• Token Efficiency: Designed to provide lean JSON responses to minimize token usage with LLMs.
• Available Tools: Provides a range of tools for interaction, including get_version, get_entity, entity_action, list_entities, search_entities_tool, domain_summary_tool, list_automations, call_service_tool, restart_ha, get_history, and get_error_log.
• Guided Conversation Prompts: Includes prompts like create_automation, debug_automation, troubleshoot_entity, routine_optimizer, automation_health_check, entity_naming_consistency, and dashboard_layout_generator.
• Resource Endpoints: Offers endpoints for accessing entity information, including detailed views and domain-specific listings.

Use Cases of Hass-MCP

• Voice Control: Control Home Assistant devices using natural language commands through AI assistants.
• Smart Home Queries: Ask AI assistants about the status of devices, sensors, and automations.
• Automated Troubleshooting: Get AI-powered assistance in diagnosing and resolving issues with automations or entities.
• Routine Optimization: Analyze usage patterns and receive suggestions for optimizing smart home routines.
• Dashboard Generation: Generate optimized Home Assistant dashboards based on user preferences.
• Proactive Smart Home Management: Identify conflicts, redundancies, or improvement opportunities within automations.

FAQ from Hass-MCP

Q: What are the prerequisites for installing Hass-MCP? A: You need a Home Assistant instance with a Long-Lived Access Token and either Docker (recommended) or Python 3.13+ with uv.

Q: How do I configure Hass-MCP with Claude Desktop? A: You need to add a specific JSON configuration to your claude_desktop_config.json file, including the Docker run command for Hass-MCP and environment variables for your Home Assistant URL and token.

Q: Can I use Hass-MCP with other MCP clients besides Claude Desktop? A: Yes, Hass-MCP can be integrated with other MCP clients like Cursor and Claude Code (CLI) by providing similar configuration details.

Q: What if Home Assistant is running in Docker on the same machine as Hass-MCP? A: You might need to add --network host to the Docker arguments or use the actual IP address of your machine instead of host.docker.internal for the container to access Home Assistant.

Q: What kind of prompts can I use with Hass-MCP? A: You can use prompts to query device states, control entities, list sensors, get domain summaries, create automations, troubleshoot issues, and search for entities, among others.

Hass-MCP

A Model Context Protocol (MCP) server for Home Assistant integration with Claude and other LLMs.

Overview

Hass-MCP enables AI assistants like Claude to interact directly with your Home Assistant instance, allowing them to:

• Query the state of devices and sensors
• Control lights, switches, and other entities
• Get summaries of your smart home
• Troubleshoot automations and entities
• Search for specific entities
• Create guided conversations for common tasks

Screenshots

Features

• Entity Management: Get states, control devices, and search for entities
• Domain Summaries: Get high-level information about entity types
• Automation Support: List and control automations
• Guided Conversations: Use prompts for common tasks like creating automations
• Smart Search: Find entities by name, type, or state
• Token Efficiency: Lean JSON responses to minimize token usage

Installation

Prerequisites

• Home Assistant instance with Long-Lived Access Token
• One of the following:
  • Docker (recommended)
  • Python 3.13+ and uv

Setting Up With Claude Desktop

Docker Installation (Recommended)

1. Pull the Docker image:

   docker pull voska/hass-mcp:latest
   

2. Add the MCP server to Claude Desktop:

   a. Open Claude Desktop and go to Settings b. Navigate to Developer > Edit Config c. Add the following configuration to your claude_desktop_config.json file:

   {
     "mcpServers": {
       "hass-mcp": {
         "command": "docker",
         "args": [
           "run",
           "-i",
           "--rm",
           "-e",
           "HA_URL",
           "-e",
           "HA_TOKEN",
           "voska/hass-mcp"
         ],
         "env": {
           "HA_URL": "http://homeassistant.local:8123",
           "HA_TOKEN": "YOUR_LONG_LIVED_TOKEN"
         }
       }
     }
   }
   

   d. Replace YOUR_LONG_LIVED_TOKEN with your actual Home Assistant long-lived access token e. Update the HA_URL:

   • If running Home Assistant on the same machine: use http://host.docker.internal:8123 (Docker Desktop on Mac/Windows)
   • If running Home Assistant on another machine: use the actual IP or hostname

   f. Save the file and restart Claude Desktop

3. The "Hass-MCP" tool should now appear in your Claude Desktop tools menu

Note: If you're running Home Assistant in Docker on the same machine, you may need to add --network host to the Docker args for the container to access Home Assistant. Alternatively, use the IP address of your machine instead of host.docker.internal.

Other MCP Clients

Cursor

1. Go to Cursor Settings > MCP > Add New MCP Server
2. Fill in the form:
   • Name: Hass-MCP
   • Type: command
   • Command:

     docker run -i --rm -e HA_URL=http://homeassistant.local:8123 -e HA_TOKEN=YOUR_LONG_LIVED_TOKEN voska/hass-mcp
     

   • Replace YOUR_LONG_LIVED_TOKEN with your actual Home Assistant token
   • Update the HA_URL to match your Home Assistant instance address
3. Click "Add" to save

Claude Code (CLI)

To use with Claude Code CLI, you can add the MCP server directly using the mcp add command:

Using Docker (recommended):

claude mcp add hass-mcp -e HA_URL=http://homeassistant.local:8123 -e HA_TOKEN=YOUR_LONG_LIVED_TOKEN -- docker run -i --rm -e HA_URL -e HA_TOKEN voska/hass-mcp

Replace YOUR_LONG_LIVED_TOKEN with your actual Home Assistant token and update the HA_URL to match your Home Assistant instance address.

Usage Examples

Here are some examples of prompts you can use with Claude once Hass-MCP is set up:

• "What's the current state of my living room lights?"
• "Turn off all the lights in the kitchen"
• "List all my sensors that contain temperature data"
• "Give me a summary of my climate entities"
• "Create an automation that turns on the lights at sunset"
• "Help me troubleshoot why my bedroom motion sensor automation isn't working"
• "Search for entities related to my living room"

Available Tools

Hass-MCP provides several tools for interacting with Home Assistant:

• get_version: Get the Home Assistant version
• get_entity: Get the state of a specific entity with optional field filtering
• entity_action: Perform actions on entities (turn on, off, toggle)
• list_entities: Get a list of entities with optional domain filtering and search
• search_entities_tool: Search for entities matching a query
• domain_summary_tool: Get a summary of a domain's entities
• list_automations: Get a list of all automations
• call_service_tool: Call any Home Assistant service
• restart_ha: Restart Home Assistant
• get_history: Get the state history of an entity
• get_error_log: Get the Home Assistant error log

Prompts for Guided Conversations

Hass-MCP includes several prompts for guided conversations:

• create_automation: Guide for creating Home Assistant automations based on trigger type
• debug_automation: Troubleshooting help for automations that aren't working
• troubleshoot_entity: Diagnose issues with entities
• routine_optimizer: Analyze usage patterns and suggest optimized routines based on actual behavior
• automation_health_check: Review all automations, find conflicts, redundancies, or improvement opportunities
• entity_naming_consistency: Audit entity names and suggest standardization improvements
• dashboard_layout_generator: Create optimized dashboards based on user preferences and usage patterns

Available Resources

Hass-MCP provides the following resource endpoints:

• hass://entities/{entity_id}: Get the state of a specific entity
• hass://entities/{entity_id}/detailed: Get detailed information about an entity with all attributes
• hass://entities: List all Home Assistant entities grouped by domain
• hass://entities/domain/{domain}: Get a list of entities for a specific domain
• hass://search/{query}/{limit}: Search for entities matching a query with custom result limit

Development

Running Tests

uv run pytest tests/

License

MIT License