LIFX MCP Server

Instructions

Implementation Reference

• src/index.ts:331-353 (handler)

  The execution logic for the toggle_power tool. It extracts parameters from args, constructs a request body with optional duration, calls the LIFX API toggle endpoint via makeLIFXRequest, and returns a success message with the API response.

  case "toggle_power": {
    const { token, selector = "all", duration } = args as {
      token: string;
      selector?: string;
      duration?: number;
    };
  
    const body = duration !== undefined ? { duration } : {};
    const result = await makeLIFXRequest(`/lights/${selector}/toggle`, {
      method: "POST",
      body,
      token,
    });
  
    return {
      content: [
        {
          type: "text",
          text: `Power toggled successfully for selector "${selector}". ${JSON.stringify(result, null, 2)}`,
        },
      ],
    };
  }

• src/index.ts:172-184 (schema)

  The tool definition including name, description, and input schema registered in the ListTools response.

  {
    name: "toggle_power",
    description: "Toggle power state of lights",
    inputSchema: {
      type: "object",
      properties: {
        token: { type: "string", description: "LIFX API token" },
        selector: { type: "string", description: "Selector for filtering lights (default: 'all')" },
        duration: { type: "number", minimum: 0, description: "Duration in seconds" },
      },
      required: ["token"],
    },
  },

• src/index.ts:72-114 (helper)

  Utility function to perform authenticated HTTP requests to the LIFX API, used by the toggle_power handler and other tools.

  async function makeLIFXRequest(
    endpoint: string,
    options: {
      method?: string;
      body?: any;
      token: string;
    }
  ): Promise<any> {
    const { method = "GET", body, token } = options;
    
    const url = `${LIFX_API_BASE}${endpoint}`;
    const headers: Record<string, string> = {
      "Authorization": `Bearer ${token}`,
      "User-Agent": USER_AGENT,
    };
  
    if (body && (method === "POST" || method === "PUT")) {
      headers["Content-Type"] = "application/json";
    }
  
    try {
      const response = await fetch(url, {
        method,
        headers,
        body: body ? JSON.stringify(body) : undefined,
      });
  
      if (!response.ok) {
        const errorText = await response.text();
        throw new Error(`LIFX API error: ${response.status} ${response.statusText} - ${errorText}`);
      }
  
      // Some endpoints return empty responses
      const contentType = response.headers.get("content-type");
      if (contentType?.includes("application/json")) {
        return await response.json();
      }
      
      return await response.text();
    } catch (error) {
      throw new Error(`Failed to make LIFX API request: ${error instanceof Error ? error.message : String(error)}`);
    }
  }