Unclear What the cap is, and so how much earlier compaction may start, is not known.
What
Automatic compaction is when Claude Code summarises the older part of a conversation to make room once it gets long. The point where this starts is now capped by a separate limit, and the cap applies only to your main conversation, not to helper tasks.
Why
Long main conversations may be summarised earlier than before.
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The writer flagged doubt
What the cap is, and so how much earlier compaction may start, is not known.