Google Cloud TTS

Setup

GOOGLE_CLOUD_TTS_CREDENTIALS

• An absolute path to a service-account JSON key file
• A raw JSON string with the service-account credentials

Configuration

{
  "voice": {
    "tts": "google-cloud-tts"
  }
}

{
  "voice": {
    "tts": "google-cloud-tts",
    "providerOptions": {
      "languageCode": "en-GB",
      "voice": "en-GB-Neural2-A"
    }
  }
}

Provider Rules

• Output is MP3 (audio/mpeg). Playback requires an MP3-capable audio pipeline.
• Language codes follow BCP-47 (e.g.

  en-US

  ,

  en-GB

  ,

  de-DE

  ).
• Call

  listAvailableVoices()

  to enumerate all voices available on the account; useful for letting the user pick a voice.
• Neural2 and WaveNet voices require the respective API feature to be enabled on the Google Cloud project.

Examples

• "Use Google Cloud TTS with a British English Neural2 voice."
• "List the available voices on my Google Cloud TTS account."
• "Synthesize this response using Google Cloud Text-to-Speech."

Constraints

• Requires a Google Cloud service account with the

  Text-to-Speech

  API enabled.
• Credentials must be either a path to a valid JSON key file or inline JSON string.
• API costs apply per character synthesized.