Monitoring changedmonitoring-usage
Nearest release: v2.1.299, published under an hour after upstream edited the page. Shown because the two are within 24 hours of each other. Nothing here says the release caused the edit.
Upstream edited this page at 14 Oct 2026 00:07 UTC, give or take a minute or two: the time comes from Anthropic’s own sitemap rather than from a commit. This site recorded the change at 14 Oct 2026 00:07 UTC.
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12561256* `pre_tokens`: Approximate token count before compaction
12571257* `post_tokens`: Approximate token count after compaction
12581258* `error`: Error message when compaction failed
1259* `precompute_reuse`: Only set when `trigger` is `"manual"`. Auto-compaction can prepare a summary in the background before the context window fills, and this attribute records whether `/compact` reused that prepared summary. `"hit"` means it was reused; `"miss_custom_instructions"`, `"miss_hook"`, and `"miss_not_ready"` give the reason a fresh summary was computed instead
1259* `precompute_reuse`: Only set when `trigger` is `"manual"` or for an [idle compaction](/docs/en/settings-reference#idlecompaction), which reports `trigger` as `"auto"`. Auto-compaction can prepare a summary in the background before the context window fills, and this attribute records whether the compaction reused that prepared summary. `"hit"` means it was reused; `"miss_custom_instructions"`, `"miss_hook"`, and `"miss_not_ready"` give the reason a fresh summary was computed instead
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12611261#### Subagent completed event
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