[u9g]

Why

During a simulation, when an agent ends the call itself (for example with EndCallTool), its on_simulation_end verdict is lost. The simulator sends finalize_simulation only after it has judged the transcript, and by then the agent's SessionHost has already closed with its AgentSession.

livekit/agents#7986 fixes this by keeping the host up for the whole job. After that change, an agent that hangs up stays in the room until it is finalized. The simulator then needs a signal that the call ended other than the agent leaving.

What

This adds AgentSessionEvent.SessionClosed { CloseReason reason = 1; optional string error = 2; } as session_closed = 24. The agent sends it when its session closes, and no session events follow it. It reuses the CloseReason enum from #1887.

Used by

• livekit/agents: sends the event (feat(voice): send session_closed to the remote session when the session closes agents#8099, used by fix(voice): keep the session host for the job so finalize_simulation outlives the session agents#7986)
• livekit/agents-private: the simulator ends the run on it (livekit/agents-private#756)

[changeset-bot]

🦋 Changeset detected

Latest commit: aa0a910

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

This PR includes changesets to release 2 packages

Name	Type
github.com/livekit/protocol	Patch
@livekit/protocol	Patch

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