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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

Publishing refuses pages wrapped in repeated runtime markup

You'll notice
Useful3 Signal2
Artifacts

Publishing stops if your page got wrapped repeatedly in runtime scaffolding, asking for the innermost document.

What

Publishing an artifact or page now detects a document that has been wrapped over and over in the same runtime scaffolding (repeated frame or chart runtime comment blocks, mermaid and syntax-highlight blocks, or stacked <base href="/_f/..."> skeletons) and stops with an error asking you to keep only the innermost document and publish again.

Details
  • The check treats this shape as impossible for a genuine page or a fetched artifact, so it is read as accidental re-wrapping rather than valid content.
  • There is a hard limit on how many nested skeleton layers will be unwrapped before publishing errors out instead of continuing.
Evidence

Delete every such comment block, attribute, tag, and repeated outer skeleton from the source, keep the innermost document, and publish again.

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 →