Bulgarian (bg-BG) for Google Gemini 3.5 Transcribe Live

[Nikola_Radkov]

Hi, I noticed that Gemini 3.5 Transcribe Live is now available in LiveKit Agent Builder, but Bulgarian (bg-BG) is missing from the language dropdown.

Google officially supports Bulgarian for this model. Are you planning to add it in the near future?

Thanks!

[darryncampbell (Darryn)]

It looks like Google list Bulgarian as experimental at Gemini 3.5 Transcribe  |  Gemini Enterprise Agent Platform  |  Google Cloud Documentation which I guess is why we don’t claim support for it through LiveKit, however you can still specify the language code and it will be passed through to the model:

        stt=inference.STT(
            model="google/gemini-3.5-transcribe-live",
            extra_kwargs={"language_codes": ["bg-BG"]},
        ),

I know you were asking about Agent Builder, but this isn’t possible through Agent Builder, you would need to download the code and make the modification manually, as described here:

Convert to code - Agent Builder | LiveKit Documentation

[Nikola_Radkov]

Can’t we change the output code directly in the platform itself? I can see that there is a source code output window in read only mode.

[darryncampbell (Darryn)]

Unfortunately Agent Builder doesn’t allow you to modify the code, so you would have to:

• Download the code
• Make the modification
• Test the change (the easiest way to do this is to install the LiveKit CLI and run lk agent console from inside the downloaded folder)
• Deploy your changed agent (the easiest way to do this is to delete the existing cloud agent created with Builder, and run lk agent create from inside the downloaded folder)

[Nikola_Radkov]

Ok, thanks for your help!

[Nikola_Radkov]

So we tried this with both Bulgarian and English and it’s not working. STT stays empty for some reason and the agent doesn’t get the transcripts at all.

[darryncampbell (Darryn)]

agent.py (8.5 KB)

Maybe try the attached? This was what I created yesterday based on GitHub - livekit-examples/agent-starter-python: A complete voice AI starter for LiveKit Agents with Python. · GitHub . You can clone that, replace the agent.py and run lk agent dev. You should then get the following: