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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 v2.1.219 24 Jul 2026

Artifact publish options moved to an options object

Under the hood

Useful2 Signal0

Artifacts

Artifact publishing takes cleaner options and can report which sidecar types were refused.

What

The artifact publish helper takes a single options bag instead of positional flags, and reports one more field on success.

Details

Options are injectDiagramRuntime, injectHighlightRuntime and composedPrReview.
Successful validation can attach refusedClassSidecarTypes to the result.
Content-type detection for uploaded files moved from an inline extension map to a helper.

Evidence

injectDiagramRuntime

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

See this entry in the whole of v2.1.219 →