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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

Reworked wording for an artifact's stored capabilities

You'll notice

Useful2 Signal1

Artifacts

Artifact capability messages now say whether they came from the type, the previous version or a default.

What

The message explaining which capabilities an artifact declared now distinguishes three cases: derived from the artifact type, carried forward from the previous version, and a default note used when the capabilities were auto-filled. The previous build only had the carried-forward wording.

Details

The default-note branch keys off an internal auto-filled flag; what exactly sets that flag, and the note's text, are not spelled out in this build.

Evidence

Te.DEFAULT_ARTIFACT_CAP_NOTE

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 →