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Realtime: send session update before tool response #1388

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merged 1 commit into from
Aug 7, 2025
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Realtime: send session update before tool response #1388

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15 changes: 8 additions & 7 deletions src/agents/realtime/session.py
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Original file line number Diff line number Diff line change
Expand Up @@ -374,19 +374,20 @@ async def _handle_tool_call(self, event: RealtimeModelToolCallEvent) -> None:
)
)

# Send tool output to complete the handoff
# First, send the session update so the model receives the new instructions
await self._model.send_event(
RealtimeModelSendSessionUpdate(session_settings=updated_settings)
)

# Then send tool output to complete the handoff (this triggers a new response)
transfer_message = handoff.get_transfer_message(result)
await self._model.send_event(
RealtimeModelSendToolOutput(
tool_call=event,
output=f"Handed off to {self._current_agent.name}",
output=transfer_message,
start_response=True,
)
)

# Send session update to model
await self._model.send_event(
RealtimeModelSendSessionUpdate(session_settings=updated_settings)
)
else:
raise ModelBehaviorError(f"Tool {event.name} not found")

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