proud-lawyer-39815
09/12/2025, 1:45 PMtall-airline-16756
09/12/2025, 1:45 PMtall-airline-16756
09/12/2025, 1:45 PMgenerate_reply
. Let me guide you through how you can do this smoothly with LiveKit's turn detection features:
• Use Turn Detection: LiveKit is designed to automatically recognize when a user has finished speaking by using Voice Activity Detection (VAD) or a turn detection model. The on_user_turn_completed
callback is your go-to spot—it gets triggered right when the user's turn is done. This is the perfect moment to call generate_reply
.
• Configure Turn Detection: You have the flexibility to tweak settings like min_endpointing_delay
(which defaults to 0.5 seconds) to make the detection just right for your needs. For example:
session = AgentSession(turn_detection="vad", min_endpointing_delay=0.5)
• Call generate_reply
After Turn Completion: Simply use the on_user_turn_completed
event to kick off the reply generation. Here's a handy example:
@session.on("user_turn_completed")
async def on_user_turn_completed(chat_ctx, user_message):
handle = session.generate_reply(instructions="Respond naturally.")
await handle
• Wait for Agent Playback: If you want to make sure the agent finishes speaking before moving on, just use the SpeechHandle
returned by generate_reply
and call await handle
.
By following these steps, you'll be able to create a smooth and natural conversation flow in your app. If you have any questions or need further help, feel free to ask—I'm here to support you!
Sources: How does end-of-utterance detection work in conversations? | VoicePipelineAgent | LiveKit Docs | livekit-agents/livekit/agents/voice/speech_handle.py | Voice activity detection (VAD) parameters | LiveKit Docs | Agent speech and audio | LiveKit Docsproud-lawyer-39815
09/12/2025, 1:47 PMtall-airline-16756
09/12/2025, 1:48 PMSpeechHandle
in LiveKit is actually designed to help manage and track agent speech specifically, rather than user speech. It’s great for awaiting the completion of agent speech using methods like waitForPlayout()
or done()
, but it doesn’t support waiting for user speech to finish.
To detect when a user has finished speaking, LiveKit uses tools like Voice Activity Detection (VAD) or turn detection models, which then trigger events such as on_user_turn_completed
. These work independently from the SpeechHandle
.
If you’d like me to walk you through this further or if you have any other questions, please don’t hesitate to ask—I’m here to help!
Sources: livekit-agents/livekit/agents/voice/agent_activity.py | Agent speech and audio | LiveKit Docs | agents/src/voice/agent_activity.ts