Backfill completion items only for the active exec turn - #34226
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## Why Multi-agent exec sessions can receive child `turn/completed` notifications on the same event stream as the primary turn. Backfilling those unrelated completions issues unnecessary `thread/read` requests. ## What changed Run completion-item backfill only after a notification has been matched to the primary exec thread and turn. ## Testing Add an integration test that delivers a child completion before the primary completion and verifies that only the primary completion triggers backfill. GitOrigin-RevId: 46a41236ee6a39e4b341570ff4826a71fa02bb32
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Backfill completion items only for the active exec turn
Why
Multi-agent exec sessions can receive child
turn/completednotifications onthe same event stream as the primary turn. Backfilling those unrelated
completions issues unnecessary
thread/readrequests.What changed
Run completion-item backfill only after a notification has been matched to the
primary exec thread and turn.
Testing
Add an integration test that delivers a child completion before the primary
completion and verifies that only the primary completion triggers backfill.