With the Xbox Skill, you can use voice commands to power your Xbox One console, adjust volume, launch games and apps, start and stop broadcasts on Mixer, capture screenshots, and more. For example, if you have the skill enabled on your Echo and you're a part of the Insider preview, just say |Alexa, start Rocket League.| and this command will automatically turn on your console, sign you in, and launch your game.
The Xbox Skill integrates with your Cortana and Alexa-enabled device such as a Windows 10 PC, Amazon Echo, Harman Kardon Invoke, Sonos One, or Cortana and Alexa apps on iOS and Android, enabling voice commands to control your Xbox One console.
The feature is currently available to select Xbox U.S. Insiders.