TTS Announcements via Home Assistant

Making an announcement

Use mcp__home-assistant__ha_call_service with domain tts and service speak:

{
  "domain": "tts",
  "service": "speak",
  "entity_id": "tts.google_en_com",
  "data": {
    "media_player_entity_id": "media_player.kitchen_speaker",
    "message": "Time to check the oven"
  }
}

The entity_id is the TTS engine entity (e.g., tts.google_en_com, tts.piper). The media_player_entity_id in data is the speaker to play on.

Discovering speakers

Find available media players with mcp__home-assistant__ha_search_entities:

{
  "search_query": "media player",
  "entity_type": "media_player"
}

To find speakers in a specific room:

{
  "search_query": "kitchen speaker"
}

Discovering TTS engines

Find available TTS engines:

{
  "search_query": "tts"
}

Multi-room announcements

Call ha_call_service once per speaker, or target a speaker group entity if one is configured:

{
  "domain": "tts",
  "service": "speak",
  "entity_id": "tts.google_en_com",
  "data": {
    "media_player_entity_id": "media_player.all_speakers",
    "message": "Dinner is ready"
  }
}

Setting volume before announcing

Adjust volume first for important announcements:

{
  "domain": "media_player",
  "service": "volume_set",
  "entity_id": "media_player.kitchen_speaker",
  "data": {
    "volume_level": 0.6
  }
}

Guidelines

• Keep messages concise and natural-sounding.
• For scheduled reminders, announce on the most relevant speaker (e.g., kitchen for cooking timers, bedroom for morning alarms).
• If you don't know which speaker to use, search for media players first and pick the most appropriate one based on context.
• When a voice request came from a specific room (check the message context), announce back to that room's speaker.