Compaction Headroom Reservation (~16.5%)
- Entity ID:
ent-20260419-f6b8d0e2a4c6 - Type:
concept - Scope:
shared - Status:
active - Aliases: 167K functional window, compaction buffer reservation
Description
Structural property that ~16.5% of the 200K Claude Code context window is permanently reserved as a compaction buffer. Auto-compaction fires at roughly 167K context tokens (83% of 200K), so the functional window users actually operate within is ~167K even though the nominal window is 200K. Hidden compaction reads ~167K and emits summary output that is logged nowhere in the transcript.
Key claims
- none yet
Relations
- Compaction Headroom Reservation (~16.5%) --[related_to]--> Compaction Pipeline