Source Intelligence

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 v2.1.69 Home All releases olderv2.1.68 v2.1.70newer
Claude Code v2.1.69

Improved Summary/Compaction System

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 →