GenerativeAI.Live : Finished property is always null on OutputTranscriptionReceived and InputTranscriptionReceived event args

[kkdubey]

When using MultiModalLiveClient with audio transcription enabled (inputAudioTranscriptionEnabled: true, outputAudioTranscriptionEnabled: true), the Finished property on the event args for both OutputTranscriptionReceived and InputTranscriptionReceived is always null — it is never set to true.

Package & Version
• Google_GenerativeAI v3.6.3
• Google_GenerativeAI.Live v3.6.3
Runtime
• .NET 8.0
• Windows

[gunpal5]

Thanks for reporting this. I've investigated and the SDK is correctly deserializing the finished field from the API
response. The issue appears to be on Google's side — the Gemini Live API doesn't seem to send the finished field in
transcription messages currently, even though it's defined in their official SDK types as an optional field.

As a workaround, you can use the TurnComplete property on ServerContent to detect when a turn (and its associated
transcription) has ended:

  _multiModalLiveClient.MessageReceived += (sender, args) =>
  {
      if (args.Response.ServerContent?.TurnComplete == true)
      {
          // Transcription for this turn is complete
      }
  };

I'll keep an eye on the API for any changes to this behavior.