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Sweep 22 Oct 2026 · 21:04Z Build v2.1.309 528 read Stable v2.1.308 Latest v2.1.309 Next v2.1.309 Feeds RSS JSON llms.txt llms-full.txt Unofficial

Claude Code v2.1.8 ·

Context Microcompaction Boundaries

Entry
JSON All of v2.1.8
EntryKind: in v2.1.8,
ChangesSection of the release
What

New internal infrastructure for tracking context compression events in long conversations.

Details
  • Adds microcompact_boundary system message type
  • Tracks metadata about compaction: trigger, tokens saved, compacted tool IDs
  • Used internally for session memory management
  • No direct user interaction required
Evidence

Uv2() at line 430955 (subtype: "microcompact_boundary", content: "Context microcompacted")

Strings lifted out of the shipped bundle, so the claim above can be checked against them.

See this entry in the whole of v2.1.8 →

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