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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 27 Aug 2026

Favicon is only required the first time you publish

You'll notice

Useful3 Signal2

Artifacts not in their notes

You only need a favicon on the first publish; redeploys keep the existing icon.

favicon

What

Artifact guidance changed from requiring favicon on every deploy to requiring it only on a first publish; on redeploys you omit it and the artifact keeps its existing icon. Artifact listings now show each artifact's favicon alongside its title, URL and last-updated time.

Evidence

Favicon (required on a first publish)

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 →