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 v2.1.27 Home All releases olderv2.1.26 v2.1.28newer
Claude Code v2.1.27

Tool Error Categorization

Tool execution failures now provide more specific error messages distinguishing between different failure types:

  • tool input error: for input validation failures
  • tool validation error: for custom validation failures
  • tool permission denied for rejected tool calls
  • tool error (Nms): for runtime errors with execution timing
Evidence

Tool error messages (search for "tool input error" and "tool validation error")

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

See this entry in the whole of v2.1.27 →