/**
* Lights Control Tool for Home Assistant (fastmcp format)
*
* This tool allows controlling lights in Home Assistant through the MCP.
* It supports turning lights on/off, changing brightness, color, and color temperature.
*/
import { z } from "zod";
import { UserError } from "fastmcp";
import { logger } from "../../utils/logger.js";
// Re-import BaseTool and MCPContext for the class definition
import { MCPContext } from "../../mcp/types.js";
import { get_hass } from "../../hass/index.js";
import { Tool } from "../../types/index.js";
// Real Home Assistant API service
class HomeAssistantLightsService {
async getLights(): Promise<Record<string, unknown>[]> {
try {
const hass = await get_hass();
const states = await hass.getStates();
return states
.filter((state) => state.entity_id.startsWith("light."))
.map((state) => ({
entity_id: state.entity_id,
state: state.state,
attributes: state.attributes,
}));
} catch (error) {
logger.error("Failed to get lights from HA:", error);
return [];
}
}
async getLight(entity_id: string): Promise<Record<string, unknown> | null> {
try {
const hass = await get_hass();
const state = await hass.getState(entity_id);
return {
entity_id: state.entity_id,
state: state.state,
attributes: state.attributes,
};
} catch (error) {
logger.error(`Failed to get light ${entity_id} from HA:`, error);
return null;
}
}
async turnOn(entity_id: string, attributes: Record<string, unknown> = {}): Promise<boolean> {
try {
const hass = await get_hass();
const serviceData = { entity_id, ...attributes };
await hass.callService("light", "turn_on", serviceData);
return true;
} catch (error) {
logger.error(`Failed to turn on light ${entity_id}:`, error);
return false;
}
}
async turnOff(entity_id: string): Promise<boolean> {
try {
const hass = await get_hass();
await hass.callService("light", "turn_off", { entity_id });
return true;
} catch (error) {
logger.error(`Failed to turn off light ${entity_id}:`, error);
return false;
}
}
}
// Singleton instance
const haLightsService = new HomeAssistantLightsService();
// Define the schema for our tool parameters using Zod
const lightsControlSchema = z.object({
action: z.enum(["list", "get", "turn_on", "turn_off"]).describe("The action to perform"),
entity_id: z
.string()
.optional()
.describe("The entity ID of the light to control (required for get, turn_on, turn_off)"),
brightness: z.number().min(0).max(255).optional().describe("Brightness level (0-255)"),
color_temp: z
.number()
.min(153)
.max(500)
.optional()
.describe("Color temperature in Mireds (153-500)"),
rgb_color: z
.tuple([z.number().min(0).max(255), z.number().min(0).max(255), z.number().min(0).max(255)])
.optional()
.describe("RGB color as [r, g, b] (0-255 each)"),
effect: z.string().optional().describe("Light effect (e.g., 'colorloop', 'random') - requires device support"),
transition: z.number().min(0).optional().describe("Transition time in seconds"),
});
// Infer the type from the schema
type LightsControlParams = z.infer<typeof lightsControlSchema>;
// Define the tool using the Tool interface
export const lightsControlTool: Tool = {
name: "lights_control",
description: "Control lights in Home Assistant. Supports listing all lights, getting state of a specific light, turning lights on with optional brightness/color settings, and turning lights off.",
parameters: lightsControlSchema,
execute: executeLightsControlLogic,
annotations: {
title: "Lights Control",
description: "Manage lighting in your home - turn on/off, adjust brightness, change colors",
readOnlyHint: false,
destructiveHint: false,
idempotentHint: true,
openWorldHint: true,
},
};
// No need for the class wrapper anymore
// export class LightsControlTool extends BaseTool { ... }
// --- Shared Execution Logic ---
// Extracted logic to be used by both fastmcp object and BaseTool class
async function executeLightsControlLogic(params: LightsControlParams): Promise<string> {
let attributes: Record<string, unknown>;
let success: boolean;
let lightDetails: Record<string, unknown> | null;
switch (params.action) {
case "list": {
const lights = await haLightsService.getLights();
return JSON.stringify({ lights });
}
case "get": {
if (params.entity_id == null) {
throw new UserError("entity_id is required for 'get' action");
}
lightDetails = await haLightsService.getLight(params.entity_id);
if (!lightDetails) {
throw new UserError(`Light entity_id '${params.entity_id}' not found.`);
}
return JSON.stringify(lightDetails);
}
case "turn_on": {
if (params.entity_id == null) {
throw new UserError("entity_id is required for 'turn_on' action");
}
attributes = {};
if (params.brightness !== undefined) attributes.brightness = params.brightness;
if (params.color_temp !== undefined) attributes.color_temp = params.color_temp;
if (params.rgb_color !== undefined) attributes.rgb_color = params.rgb_color;
if (params.effect !== undefined) attributes.effect = params.effect;
if (params.transition !== undefined) attributes.transition = params.transition;
success = await haLightsService.turnOn(params.entity_id, attributes);
if (!success) {
throw new UserError(`Failed to turn on light '${params.entity_id}'. Entity not found?`);
}
lightDetails = await haLightsService.getLight(params.entity_id); // Get updated state
return JSON.stringify({ status: "success", state: lightDetails });
}
case "turn_off": {
if (params.entity_id == null) {
throw new UserError("entity_id is required for 'turn_off' action");
}
success = await haLightsService.turnOff(params.entity_id);
if (!success) {
throw new UserError(`Failed to turn off light '${params.entity_id}'. Entity not found?`);
}
lightDetails = await haLightsService.getLight(params.entity_id); // Get updated state
return JSON.stringify({ status: "success", state: lightDetails });
}
default:
// Should be unreachable due to Zod validation
throw new UserError(`Unknown action: ${String(params.action)}`);
}
}
