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

Claude Code v2.1.69 ·

Improved Summary/Compaction System

Entry
JSON All of v2.1.69
EntryKind: in v2.1.69,
ChangesSection of the release

The conversation summary system has been significantly revised:

  • New <<ANALYSIS_INSTRUCTION>> placeholder system for injecting analysis instructions
  • Support for partial compaction of only recent messages when earlier context is retained
  • Lean compaction mode (tengu_lean_cast) with shorter analysis prompts focused on coverage over detail
  • Better handling of large conversation files via optimized compact_boundary detection for files over 64MB
Evidence

Summary improvements (search for "<<ANALYSIS_INSTRUCTION>>", "tengu_lean_cast")

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

See this entry in the whole of v2.1.69 →

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