[ninglinLiu]

Description

The Google plugin reads GOOGLE_GENAI_USE_VERTEXAI in three places, and they disagree. LLM and the realtime model enable Vertex AI for true or 1, which is also what the plugin README documents ("Set to true or 1 to enable Vertex AI"). The beta Gemini TTS only checked for 'true', so with GOOGLE_GENAI_USE_VERTEXAI=1 it silently used the Gemini Developer API instead: it threw API key is required ... GOOGLE_API_KEY when no API key was set, or sent requests to the Developer API instead of the configured Vertex project.

While checking the env vars, the README also lists GOOGLE_GENAI_API_KEY as an alternative to GOOGLE_API_KEY, but no code in the plugin reads it. LLM, TTS and the realtime model all fall back to GOOGLE_API_KEY only and throw if it is unset, so a user following the README with only GOOGLE_GENAI_API_KEY set gets an error.

Changes Made

• plugins/google/src/beta/gemini_tts.ts: accept 'true' or '1' for GOOGLE_GENAI_USE_VERTEXAI, the same check as llm.ts and realtime_api.ts.
• plugins/google/README.md: list only GOOGLE_API_KEY as the API key env var.
• Tests for the TTS client options, and a patch changeset.

Pre-Review Checklist

• Build passes: eslint and prettier pass for the changed files; the Gemini TTS tests pass locally
• AI-generated code reviewed: prepared with the help of an AI coding assistant; I reviewed the diff and compared it with the existing checks in llm.ts and realtime_api.ts
• Changes explained
• Scope appropriate: limited to how the Google plugin reads its env vars

Testing

• Automated tests added in gemini_tts.test.ts: GOOGLE_GENAI_USE_VERTEXAI=true and =1 create a Vertex AI client for the configured project, and an unset value uses the API key. The =1 case fails on main and passes with this change.
• vitest run plugins/google/src/beta/gemini_tts.test.ts: 21 passed, 1 skipped (the live-provider test)

[changeset-bot]

🦋 Changeset detected

Latest commit: b5fc2a2

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 41 packages

Name	Type
@livekit/agents-plugin-google	Patch
@livekit/agents	Patch
@livekit/agents-plugin-anam	Patch
@livekit/agents-plugin-anthropic	Patch
@livekit/agents-plugin-assemblyai	Patch
@livekit/agents-plugin-azure	Patch
@livekit/agents-plugin-baseten	Patch
@livekit/agents-plugin-bey	Patch
@livekit/agents-plugin-cartesia	Patch
@livekit/agents-plugin-cerebras	Patch
@livekit/agents-plugin-deepgram	Patch
@livekit/agents-plugin-did	Patch
@livekit/agents-plugin-elevenlabs	Patch
@livekit/agents-plugin-fishaudio	Patch
@livekit/agents-plugin-hume	Patch
@livekit/agents-plugin-inworld	Patch
@livekit/agents-plugin-krisp	Patch
@livekit/agents-plugin-lemonslice	Patch
@livekit/agents-plugin-liveavatar	Patch
@livekit/agents-plugin-livekit	Patch
@livekit/agents-plugin-meta	Patch
@livekit/agents-plugin-minimax	Patch
@livekit/agents-plugin-mistral	Patch
@livekit/agents-plugin-mistralai	Patch
@livekit/agents-plugin-neuphonic	Patch
@livekit/agents-plugin-openai	Patch
@livekit/agents-plugin-perplexity	Patch
@livekit/agents-plugin-phonic	Patch
@livekit/agents-plugin-protoface	Patch
@livekit/agents-plugin-resemble	Patch
@livekit/agents-plugin-rime	Patch
@livekit/agents-plugin-runway	Patch
@livekit/agents-plugin-sarvam	Patch
@livekit/agents-plugin-silero	Patch
@livekit/agents-plugin-soniox	Patch
@livekit/agents-plugin-speechify	Patch
@livekit/agents-plugin-synthesia	Patch
@livekit/agents-plugin-tavus	Patch
@livekit/agents-plugins-test	Patch
@livekit/agents-plugin-trugen	Patch
@livekit/agents-plugin-xai	Patch

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no bugs or issues to report.