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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.

← All of v2.1.251 Home All releases ←olderv2.1.250

Claude Code v2.1.251 28 Aug 2026

Publishing by URL can now require a live document version

You'll notice

Useful2 Signal3

Artifacts

Publishing by URL now fails clearly when there is no live document version.

What

The artifact tool routes publish input through a live-document-version step that can refuse the call, and publishing by URL without a live document now produces its own error rather than proceeding. The tool's own description gains a matching branch describing the live document version.

Details

Depends on the live-edit module being present; without it, publishing behaves as before.

Evidence

Te.PUBLISH_BY_URL_NEEDS_LIVE_DOC

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

See this entry in the whole of v2.1.251 →