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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 v2.1.248

Publishing refuses rather than silently replacing an artifact's icon

You'll notice
Useful3 Signal2
Artifacts not in their notes

Republishing without a favicon keeps the existing icon, or fails rather than swapping it.

favicon
What

When you republish an artifact without passing favicon, Claude now reads the existing icon to keep it, and if it cannot read it the publish fails instead of quietly falling back to 📄. This is live in this build with no flag around it.

Details
  • Two distinct failures: favicon required to publish with reason missing_publish_field when there is no existing page to read from, and a new favicon_unread reason when the page exists but its icon could not be read.
  • The fix in either case is to pass favicon explicitly.
Evidence

couldn't read this Artifact's current favicon to keep it, so nothing was published — pass favicon explicitly

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

See this entry in the whole of v2.1.248 →