is there a way to manually switch to push-to-talk mode?

Thanks for reaching out, Hyeonsu. I'm an AI assistant and I'm here to help. Give me a moment while I research this topic.

Can i change the turn_detection value after a session started with a specific turn_detection model?

You're asking whether you can change

turn_detection

after a session has already started with a specific model — yes, you can. What to do: 1. Use the AgentActivity API's

update_options()

method at runtime. 2. Call

update_options()

with the new

turn_detection

value (for example switching from

"vad"

to

"stt"

or to a custom model). 3. The new setting takes effect immediately for subsequent user input processing. If you want, I can provide a short code snippet (Python or JS) showing the exact

update_options()

call. Which language would help? Sources: Agents (Python) | livekit/livekit_composite | DeepWiki

Can i disable responding of agent but still get the transcript of user's speech

You're asking if you can stop the agent from responding but still receive the user's speech transcript — yes. What to do: 1. Disable agent outputs by setting

audio_enabled=False

in

RoomOutputOptions

(this prevents audio responses). 2. Keep transcription enabled — the agent will publish user transcripts to the

lk.transcription

text stream topic. 3. Read the transcriptions by subscribing to the

lk.transcription

text stream (the playground UI may not show them, so implement a custom receiver to capture transcripts). Optional: instead of permanently disabling outputs, you can temporarily stop responses with

session.interrupt()

while leaving transcription active for logging/monitoring. Would you like a short code snippet (Python or JS) showing the

RoomOutputOptions

config and how to subscribe to

lk.transcription

? Sources: How to Set Up Speech-to-Text Input with Text-Only Output in LiveKit Agents

Can i dynamically control

audio_enabled

?

You're asking if

audio_enabled

can be changed at runtime — yes. What to do: 1. Use

session.output.set_audio_enabled()

to toggle agent audio output on/off during a session. 2. Use

session.input.set_audio_enabled()

to toggle user audio capture (push-to-talk etc.) during a session. These calls take effect immediately and work in both Python and Node.js SDKs. Would you like a short code snippet in Python or JavaScript? Sources: Text and transcriptions | LiveKit docs

이 구조면 에이전트는 실제로 대답은 하지만 오디오가 안들리는거잖아, 이걸 아예 대답도 안하도록 할 수는 없을까

맞습니다 — 에이전트가 내부적으로는 응답을 생성하더라도 오디오만 끄면 들리지 않는 상태가 되므로, 에이전트가 아예 응답을 생성하지 않도록 설정할 수 있습니다. 가능한 방법은 다음 세 가지 중 선택하시면 됩니다. 1) generate_reply() 호출하지 않기 (가장 간단) • 사용자 턴 완료 훅에서

generate_reply()

또는 응답 생성 로직을 호출하지 않으면 에이전트는 응답을 생성하지 않습니다. • STT(트랜스크립션)는 계속 동작합니다. 2) 출력 전체 비활성화 • 세션 시작 시 또는 런타임에 `RoomOutputOptions`에서

audio_output=False

, `text_output=False`로 설정하면 에이전트의 오디오·텍스트 응답 전송을 차단합니다. • 이 경우도 STT는 계속 수집되지만 에이전트 응답은 전송되지 않습니다. 3) LLM/응답 노드 오버라이드(자원 소모 차단) • 에이전트의 `llm_node`(또는 응답 생성 담당 함수)를 빈 응답을 반환하도록 오버라이드하면 LLM 호출 자체를 하지 않아 응답이 전혀 생성되지 않습니다. • 가장 완전하게 "침묵" 상태를 구현합니다. 원하시면 위 방법별로 Python 또는 JavaScript 예제 코드를 바로 보여드릴게요. 어느 언어로 보시겠습니까? Sources: Text and transcriptions | LiveKit docs | Streamline Troubleshooting with Agent Observability

can i see the example of what you said?

You're asking whether you can change

turn_detection

after a session has already started with a specific model — yes, you can.

What to do:

1. Use the AgentActivity API's

update_options()

method at runtime.

2. Call

update_options()

with the new

turn_detection

value (for example switching from

"vad"

to

"stt"

or to a custom model).

3. The new setting takes effect immediately for subsequent user input processing.

If you want, I can provide a short code snippet (Python or JS) showing the exact

update_options()

call. Which language would help?

Below are concise examples showing how to call

update_options()

at runtime to change

turn_detection

. Choose the language you use. Python

# assume `activity` is your AgentActivity or session object
# switch turn_detection to "stt" (or any other supported value)
await activity.update_options({"turn_detection": "stt"})

JavaScript / TypeScript

// assume `activity` is your AgentActivity or session object
// switch turn_detection to "stt" (or any other supported value)
await activity.updateOptions({ turn_detection: "stt" });

Notes: • The new

turn_detection

value takes effect immediately for subsequent user input processing. • You can call this any time during an active session to switch modes (e.g., "vad", "stt", or a custom model).