i initialise my session with an agent and make it say a message. i have a function bound to the agest_state_changed event. but the event does not trigger. the issue is intermitent as it happens in some calls and works fine in other

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

session = await init_agent_session(ctx=ctx) await session.start( agent=CustomAgent(on_enter_message=message, for_disconnection=True), room=ctx.room, ) @session.on("agent_state_changed") def on_agent_state_changed(event: AgentStateChangedEvent): log( f"Agent state changed: {event.new_state}, old state: {event.old_state} for room {ctx.room.name}" ) if event.old_state == "speaking" and event.new_state == "listening": log( f"Agent finished speaking, disconnecting room {ctx.room.name}" ) lkapi = api.LiveKitAPI() discon_task = asyncio.create_task( lkapi.room.delete_room( api.DeleteRoomRequest(room=ctx.room.name) ) )

Thanks — this is helpful. I reviewed your snippet and the behavior you described. I’ll highlight the most likely causes given your code and give concrete, focused actions to diagnose and fix the intermittent misses. What I see in your snippet • You call

await session.start(...)

before defining the

@session.on("agent_state_changed")

handler. That can cause missed events if the agent transitions state during or immediately after

session.start

and before the handler is attached. • The handler dispatches an async room-delete task and does not protect against handler exceptions or race conditions that could cancel/interrupt expected flow. Most likely causes and why they matter • Handler bound too late: If the agent goes through quick state transitions (initializing → speaking → listening) during startup, binding after

session.start

can miss those transitions. • Race between events and your delete task: Deleting the room immediately when the agent transitions back to

listening

could interfere with other in-flight events or session cleanup. If deletion runs concurrently and removes resources early, subsequent events or reconnections may not be delivered. • Exceptions in the handler: If the handler raises an exception (for example from

lkapi.room.delete_room

or from misuse of

ctx

), the event loop may swallow the exception and future processing could be affected. • Multiple session/handler instances: If you create sessions repeatedly and bind multiple handlers, you might be listening on a different session instance than the one that emits the event. Concrete steps to try now (small, safe changes you can apply) 1. Bind the handler before starting the session a. Move the

@session.on("agent_state_changed")

handler so it’s defined before

await session.start(...)

. b. This ensures you capture any early transitions that occur during startup. 1. Make the handler robust and non-blocking a. Wrap handler body in try/except and log exceptions. b. Avoid awaiting long/blocking calls directly inside the handler. Use

asyncio.create_task()

for room deletion (you already do this) but ensure you handle its exceptions: ▪︎ Save the task and add a done callback that logs failures. 1. Add defensive checks and short delay before destructive actions a. Before deleting the room, confirm the session/agent is still in the expected state (re-check current agent state or add a short debounce, e.g., 200–500 ms) to avoid reacting to transient transitions. 1. Add logging with timestamps and session/agent IDs a. Log when you bind the handler, when

session.start

is called, and each received

agent_state_changed

event with timestamps. b. If intermittent, the timing will reveal if events occurred before handler attachment or if the room delete caused issues. 1. Ensure you attach handler to the correct session instance a. If you ever create more than one session object, log

id(session)

when binding and when starting to confirm they match. Example pattern to try (conceptual; adapt to your framework) 1. Define & bind handler 2. Start session 3. In handler: ◦ try: ▪︎ log event with timestamp and session id ▪︎ if transition speaks→listening: • create task to delete room • attach callback to task to log exceptions ◦ except Exception as e: ▪︎ log exception Follow-up diagnostics I can help with • Paste logs showing: timestamp of

session.start

, timestamp of handler binding (add a log for this), and timestamps of any received

agent_state_changed

events from a failing call. • Tell me whether

ctx

or

session

are re-used across calls or recreated each time. • Tell me whether you see any exceptions in logs related to the handler, or any errors from the LiveKit API when deleting the room. If you want, paste a minimal 10–20 line snippet that shows the handler moved before

session.start

and I’ll give a concrete corrected snippet (including try/except and task error handling) you can drop in. , with interactive elements