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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 v2.1.235

Document artifacts keep comment threads pinned to blocks that get edited

You'll notice
Useful3 Signal3
Artifacts

Comments on a document artifact now stay attached to the right block after you edit the document.

What

The document artifact template now stamps every commentable block (headings, paragraphs, list items, table cells) with a short stable id, so comments stay attached to the block they were left on when the document is edited.

Details
  • Ids authored in the file are kept; duplicates created by pasting or splitting a block are shed, and duplicate ids are stripped again on save.
  • The script re-runs on later DOM changes via a MutationObserver, so blocks added after load also get ids.
  • The skill instructions now tell Claude to preserve existing block ids when editing, because renaming or dropping one detaches that block's comment thread.
Evidence

DOC:anchors:begin

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

See this entry in the whole of v2.1.235 →