Include item start times in completion events#35363
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copyberry[bot] merged 1 commit intoJul 25, 2026
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## What changed - Add an optional `started_at_ms` field to `ItemCompletedEvent`, retaining compatibility with older persisted events that lack it. - Track the first start timestamp for each in-flight item and attach it when emitting and persisting the completion event. If no start was recorded, use the completion timestamp as a fallback. - Emit a complete start/completion lifecycle for subagent activity items. ## Testing - Cover concurrent item timing, repeated starts, turn-boundary cleanup, the missing-start fallback, subagent activity, and persisted web-search events. GitOrigin-RevId: e7cec9c4f1ef6ba67f287e81fb4d7d856fcf87a7
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Include item start times in completion events
What changed
started_at_msfield toItemCompletedEvent, retainingcompatibility with older persisted events that lack it.
emitting and persisting the completion event. If no start was recorded, use
the completion timestamp as a fallback.
Testing
missing-start fallback, subagent activity, and persisted web-search events.