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 v2.1.239 Home All releases olderv2.1.238 v2.1.240newer
Claude Code v2.1.239

Artifact failure messages point at the tool's own read action instead of WebFetch

You'll notice
Useful2 Signal2
Artifacts

Failed artifact publishes now tell Claude to re-read via the artifact tool, not WebFetch.

What

When a publish or live edit fails, the advice now tells the model to read the page back with the Artifact tool's read action rather than fetching the URL, and pasted markdown is rejected with instructions to write HTML markup to a .html file first.

Details
  • The generic publish description is now "Publish a local file" instead of naming HTML or Markdown.
Evidence

Write the page as HTML markup to an .html file first (Write/Edit)

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

See this entry in the whole of v2.1.239 →