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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.

All of v2.1.81 Home All releases olderv2.1.80 v2.1.83newer
Claude Code v2.1.81

Time-Based Micro-Compaction [Gradual Rollout]

What

Automatically clears old tool result content when the user returns after an idle gap, reducing context size without a full compaction.

Status

Feature-flagged by tengu_slate_heron.

Details
  • Detects idle gaps between the last assistant message and the current time
  • When the gap exceeds a configurable threshold, replaces old tool results with "[Old tool result content cleared]"
  • Keeps the N most recent tool results intact (keepRecent config)
  • Logs token savings: "[TIME-BASED MC] gap Xmin > Ymin, cleared Z tool results (~N tokens), kept last M"
  • Triggers automatic compaction marker after clearing
Evidence

Time-based micro-compaction (gated by tengu_slate_heron, search for "[TIME-BASED MC]" and "[Old tool result content cleared]")

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

See this entry in the whole of v2.1.81 →