Home Assistant

Control Home Assistant smart home and query states using MCP protocol.

Prerequisites

Enable MCP server in Home Assistant:

• Browse to your Home Assistant instance.
• Go to Settings > Devices & services.
• In the bottom right corner, select the + Add Integration button.
• From the list, select Model Context Protocol.
• Follow the instructions on screen to complete the setup.

Config

When prompted that the MCP server does not exist, remind the user to configure the HASSBASEURL and HASSACCESSTOKEN environment variables by executing the following command to add the configuration:

npx -y mcporter config add home-assistant \
  --transport http \
  --url "${HASS_BASE_URL:-http://homeassistant.local:8123}/api/mcp" \
  --header "Authorization=Bearer \${HASS_ACCESS_TOKEN}"

Usage

# Get states
npx -y mcporter call home-assistant.GetLiveContext

# Turn on the device
npx -y mcporter call home-assistant.HassTurnOn(name: "Bedroom Light")
npx -y mcporter call home-assistant.HassTurnOn(name: "Light", area: "Bedroom")

# Turn off the device
npx -y mcporter call home-assistant.HassTurnOff(name: "Bedroom Light")
npx -y mcporter call home-assistant.HassTurnOff(area: "Bedroom", domain: ["light"])

# Control light
# brightness: The percentage of the light, where 0 is off and 100 is fully lit.
# color: Name of color
npx -y mcporter call home-assistant.HassLightSet(name: "Bedroom Light", brightness: 50)

# Control fan
# percentage: The percentage of the fan, where 0 is off and 100 is full speed.
npx -y mcporter call home-assistant.HassFanSetSpeed(name: "Fan", area: "Bedroom", percentage: 80)

Execute the following command to learn about specific usage methods:

• npx -y mcporter list home-assistant --schema --all-parameters

About mcporter

• To improve compatibility, use npx -y mcporter instead of mcporter when executing commands.
• https://github.com/steipete/mcporter/raw/refs/heads/main/docs/call-syntax.md
• https://github.com/steipete/mcporter/raw/refs/heads/main/docs/cli-reference.md