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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 v2.1.246 25 Aug 2026

Publishing an artifact built from a type rejects capabilities, contract and lang

You'll notice

Useful2 Signal2

Artifacts

Publishing a typed artifact now refuses capabilities, contract or lang with an explanation.

What

Supplying capabilities, a contract or a language when publishing an artifact that was created from an Artifact type is now refused outright with an explanatory reason, joining the existing refusal of live files for typed artifacts.

Evidence

an artifact made from a type takes no capabilities, contract, or lang

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

See this entry in the whole of v2.1.246 →