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codex/codex-rs/state/src
Charlie Marsh fd3c1dc13d Optimize remote compaction history handling (#34431)
## Why

Remote compaction can process large histories. Repeatedly estimating and replacing the full history, and cloning it when tracing is disabled, adds avoidable CPU and memory overhead.

## What changed

- Estimate each history item's token count once, update the total as trailing tool outputs are rewritten, and replace history only after all rewrites are selected.
- Preserve unclamped token totals while calculating removed tokens so saturated estimates do not hide overflow.
- Snapshot compaction input history only when rollout tracing is enabled.
- Reuse the v2 request input instead of cloning it before adding the compaction trigger.

## Testing

- Cover enabled and disabled compaction trace contexts through `is_enabled()` assertions.

GitOrigin-RevId: 8de9c9704ba29532fba05430eb204bbae2e8bf83
2026-07-20 23:30:30 +00:00
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2026-07-20 21:00:17 +00:00