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 v2.1.42 Home All releases olderv2.1.41 v2.1.44newer
Claude Code v2.1.42

  • Removed verbose prompt cache break logging ([PROMPT CACHE BREAK] messages)
  • Removed detailed cache break reason strings (model changed, tools changed, system prompt changed)
  • Simplified Opus plan restriction messaging
  • Removed fs from the documented example list in hook globals (still accessible via require())

See this entry in the whole of v2.1.42 →