hass-mcp

An open-source MCP server for controlling and querying Home Assistant.

• Transport: stdio

• Auth: Home Assistant long-lived token

• API: Home Assistant REST API

Features

Tools exposed:

• ha_get_state — get state for an entity

• ha_list_states — list all states (can be large)

• ha_call_service — call any service

Install

pnpm install
pnpm build

Run

export HASS_URL="http://homeassistant.local:8123"
export HASS_TOKEN="<your long-lived access token>"

pnpm start

Configure in an MCP client

Example (conceptual):

{
  "mcpServers": {
    "homeassistant": {
      "command": "npx",
      "args": ["-y", "hass-mcp"],
      "env": {
        "HASS_URL": "http://homeassistant.local:8123",
        "HASS_TOKEN": "..."
      }
    }
  }
}

Security

• Treat tokens as secrets.

• Prefer running this server on the same LAN as Home Assistant.

• If your HA is behind Cloudflare Access, run this MCP server on the LAN side.

License

MIT