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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

Published pages nested inside fake serve-marker wrappers are now rejected

You'll notice
Useful2 Signal2
Artifacts

Published pages hiding content inside repeated fake serve markers are unwrapped or refused.

What

Published artifact pages that hide their real content inside repeated serve-marker wrappers or stacked duplicate HTML skeletons are now unwrapped and, past a limit, refused with an instruction to delete the fake markers and republish.

Details
  • The markers detected are ` comment blocks and data-frame-runtime attributes, plus repeated <!doctype html>` shells; the code notes this is not a shape a genuine page or fetched artifact has.
  • Unwrapping stops at 64 nesting levels, a constant baked into the build with no setting to change it.
  • Hitting the cap produces an explicit refusal message rather than serving the inner content.
Evidence

This page carries serve-marker blocks or data-frame-runtime attributes nested so that removing one keeps exposing another

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 →