Homeassistant Light Mcp
A focused Home Assistant integration that deliberately limits scope to lights only for safety reasons. It exposes eight tools including scene_show_lights for viewing RGB colors and brightness, scene_adjust_light for controlling individual lights, and full scene management (create, activate, update, delete). Also includes scene_blackout to kill all lights with optional exclusions. The key differentiator is detailed color information that the official Home Assistant MCP doesn't expose, plus built-in workarounds for IKEA Tradfri timing issues when switching between RGB and Kelvin modes. Scenes are backed up locally to ~/.config/ha-mcp-server and support both exclusive and additive modes. Connects via Home Assistant's REST API using a long-lived access token.
- tools
- 11
- auth
- Secret needed
- transport
- STDIO
- env vars
- 2
- last updated
- Dec 8, 2025
Tools
11 toolsPublic tool metadata for what this MCP can expose to an agent.
scene_show_lightsShow all lights with state, brightness, colors, effects, color modes
Show all lights with state, brightness, colors, effects, color modes
No parameter schema in public metadata yet.
scene_adjust_lightControl a light (on/off, brightness, color, effects)
Control a light (on/off, brightness, color, effects)
No parameter schema in public metadata yet.
scene_createCreate a new scene from current light states
Create a new scene from current light states
No parameter schema in public metadata yet.
scene_listList all scenes
List all scenes
No parameter schema in public metadata yet.
scene_activateActivate a scene
Activate a scene
No parameter schema in public metadata yet.
scene_updateUpdate existing scene with current lights
Update existing scene with current lights
No parameter schema in public metadata yet.
scene_deleteDelete a scene
Delete a scene
No parameter schema in public metadata yet.
scene_blackoutTurn off all lights (supports exclusions)
Turn off all lights (supports exclusions)
No parameter schema in public metadata yet.
scene_diagnoseDiagnose lights and scenes, check connectivity
Diagnose lights and scenes, check connectivity
No parameter schema in public metadata yet.
scene_fixFix scene problems, restore from backup
Fix scene problems, restore from backup
No parameter schema in public metadata yet.
scene_configureSet Home Assistant URL and token
Set Home Assistant URL and token
No parameter schema in public metadata yet.
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HA_URL*Home Assistant URL (e.g., http://192.168.1.100:8123)
HA_TOKEN*secretHome Assistant long-lived access token
Readme
Home Assistant Light MCP
A Model Context Protocol (MCP) server for controlling Home Assistant lights and managing scenes. Complements the official Home Assistant MCP by providing detailed light control with colors and scene management.
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Design Philosophy: Lights Only
This MCP intentionally controls only lights - not switches, not other entities. This is a deliberate safety decision:
- Switches can control critical systems - HVAC, heaters, air conditioning, water pumps
- Accidental activation could be dangerous - turning on a heater while away, disabling AC in summer
- Lights are safe - worst case is lights turn on/off unexpectedly
Details
- Repository
- github.com/koneisto/homeassistant-light-mcp
- Category
- Design & Creative
- Package
ha-mcp-server- Transport
- STDIO
- Auth
- Required
- Registry
- MCP registry, active
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