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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 v2.1.228

Shared persistence and formula kit inside the doc and sheet templates

Not switched on
Useful1 Signal4
Artifacts

The doc and sheet templates save block by block and only claim persistence once the server accepts.

Shared save, comment and edit regions live in the disabled document and spreadsheet templates.

What

Both templates embed a common set of marked regions for saving, comments, editing and styling. Edits save back into the artifact block by block, and the save indicator only claims the change is persisted after the server accepts the commit, showing a local-only state otherwise.

Details
  • Comments live in a hidden block inside the document itself rather than any external service.
  • The spreadsheet has a formula engine with its own tokenizer and parser and no use of eval, supporting SUM, AVERAGE, MIN, MAX, COUNT, ROUND, IF, SUMIF and COUNTIF.
  • It also supports tab-separated paste and copy, Ctrl/Cmd+D fill-down, and click-to-sort column letters that reorder only the current viewer's view.
  • Ships disabled with the two skills.
Evidence

// KIT:persist:begin \u2014 live persistence, live docs only: self.edit is the

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

See this entry in the whole of v2.1.228 →