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DisclaimerUnofficial, and not affiliated with Anthropic. Nearly all of this is read straight out of what ships: npm bundles, captured prompts, published docs. Anthropic's own notes go in verbatim, marked as theirs. The rest is my reading, and every entry carries the strings behind it. If one looks wrong, vote it down and say why.

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Claude Code v2.1.8

Context Microcompaction Boundaries

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.

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.8 →