You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
CompactionArea: what it touches
ImprovementsKind: in v2.1.288,
ImprovementsSection of the release
What
Compaction is how Claude Code shortens a long conversation by replacing older messages with a summary. Claude Code now has logic that decides whether a summary it already made can be reused. It refuses in cases such as these:
the marker for where the summary starts is missing
there is a reply the summary has not seen
a hook rewrote the messages (a hook is a script you set up to run at certain moments)
the result would not fit
Why
Reusing an existing summary could make compaction quicker.
How sure we are
Something disagreesSomething we can check disagrees with this entry, or the writer said they could not settle it.
The writer flagged doubtWhat triggers this reuse, and whether it is switched on, is not stated.
