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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.

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Claude Code v2.1.223

Artifact comment auto-reply can patch instead of rewriting the page

You'll notice
Useful3 Signal0
Artifacts

Artifact auto-replies now make targeted find-and-replace edits instead of regenerating the whole page.

What

The auto-react composer can now apply targeted find/replace edits to artifact source rather than regenerating the whole document.

Details
  • edits are exact-string, applied in order, subject to a byte budget and a per-edit uniqueness requirement
  • the full-rewrite form is kept only as an escape hatch for sweeping changes
  • one retry with feedback when a find string is not found or is ambiguous, and one re-prompt when the decision JSON is malformed
  • source is fenced with a per-version random nonce and the composer refuses if the model echoes it
  • new failure telemetry: edit_patch_apply_failed and edit_decision_reformat
Evidence

Patch rules: each "find" must be copied character-for-character from the source

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

See this entry in the whole of v2.1.223 →