If a message from the agent is interrupted before completion, only the portion that was actually played and heard by the user is saved in the conversation history. The system uses a synchronized transcript to determine exactly what part of the message was delivered before the interruption. That partial message is saved with an

interrupted=True

flag. If the agent was interrupted before any speech was played, no message is added to the conversation history at all. This ensures the conversation history reflects only what was actually communicated, not the entire generated message if it was never fully delivered. Sources: livekit-agents/livekit/agents/voice/agent_activity.py | Turn detection and interruptions | LiveKit Docs