Respect final-answer boundaries for queued agent mail - #33367
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## Why Queue-only child-agent updates that arrive around a final answer should not restart sampling, but they must remain available to the next turn. Explicitly injected response items still need to reopen the current turn. ## What changed - Defer queue-only inter-agent mail after a final answer without treating it as same-turn pending input. - Re-enable current-turn mailbox delivery when the model requests a follow-up, a stop hook continues the turn, or a response item is explicitly injected. - Check for turn-triggering mailbox work after clearing the completed active turn so pending work can start safely. ## Testing Added coverage that queued child mail waits for the next user turn and that an injected response item after a final answer triggers a follow-up request. GitOrigin-RevId: aa81d00707943284b7ab069b60970e547908c895
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Respect final-answer boundaries for queued agent mail
Why
Queue-only child-agent updates that arrive around a final answer should not
restart sampling, but they must remain available to the next turn. Explicitly
injected response items still need to reopen the current turn.
What changed
same-turn pending input.
a stop hook continues the turn, or a response item is explicitly injected.
turn so pending work can start safely.
Testing
Added coverage that queued child mail waits for the next user turn and that an
injected response item after a final answer triggers a follow-up request.