Source Intelligence

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 v2.1.248 Home All releases olderv2.1.247 v2.1.250newer
Claude Code v2.1.248

Artifact updates from an earlier conversation need a read first

You'll notice
Useful3 Signal3
Artifacts

Publishing to an artifact this conversation never read is refused, and returns the live version.

What

The Artifact tool's instructions now require reading an artifact you only have the URL for before publishing to it. A publish to an artifact this conversation has never read or published is refused, and the refusal returns the current live version so the model can build on it instead of overwriting.

Details
  • Applies to every session that has the Artifact tool; no setting involved.
Evidence

a publish to an artifact this conversation has not read or published is refused and hands you the live version to build on

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 →