core/homeassistant/components/soundtouch/services.yaml

play_everywhere:
  name: Play everywhere
  description: Play on all Bose SoundTouch devices.
  fields:
    master:
      name: Master
      description: Name of the master entity that will coordinate the grouping. Platform dependent. It is a shortcut for creating a multi-room zone with all devices
      required: true
      selector:
        entity:
          integration: soundtouch
          domain: media_player

create_zone:
  name: Create zone
  description: Create a SoundTouch multi-room zone.
  fields:
    master:
      name: Master
      description: Name of the master entity that will coordinate the multi-room zone. Platform dependent.
      required: true
      selector:
        entity:
          integration: soundtouch
          domain: media_player
    slaves:
      name: Slaves
      description: Name of slaves entities to add to the new zone.
      required: true
      selector:
        entity:
          multiple: true
          integration: soundtouch
          domain: media_player

add_zone_slave:
  name: Add zone slave
  description: Add a slave to a SoundTouch multi-room zone.
  fields:
    master:
      name: Master
      description: Name of the master entity that is coordinating the multi-room zone. Platform dependent.
      required: true
      selector:
        entity:
          integration: soundtouch
          domain: media_player
    slaves:
      name: Slaves
      description: Name of slaves entities to add to the existing zone.
      required: true
      selector:
        entity:
          multiple: true
          integration: soundtouch
          domain: media_player

remove_zone_slave:
  name: Remove zone slave
  description: Remove a slave from the SoundTouch multi-room zone.
  fields:
    master:
      name: Master
      description: Name of the master entity that is coordinating the multi-room zone. Platform dependent.
      required: true
      selector:
        entity:
          integration: soundtouch
          domain: media_player
    slaves:
      name: Slaves
      description: Name of slaves entities to remove from the existing zone.
      required: true
      selector:
        entity:
          multiple: true
          integration: soundtouch
          domain: media_player