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 v2.1.91 Home All releases olderv2.1.90 v2.1.92newer
Claude Code v2.1.91

Ultraplan Improvements

The Ultraplan feature received several enhancements:

  • Better error handling: "Ultraplan hit an unexpected error during launch" message now sent to the model for graceful recovery
  • Auto-polling timeout: sessions that remain unresolved are automatically cleaned up
  • Telemetry: new tengu_ultraplan_stopped event when killing ultraplan tasks
  • Terms tracking with hasSeenUltraplanTerms state
Evidence

Ultraplan error and state management (search for "Ultraplan hit an unexpected error")

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

See this entry in the whole of v2.1.91 →