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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 v2.1.227

Artifact tool: put the title near the top, and pass a URL to update an existing artifact

Use it now
Useful4 Signal2
Artifacts

To update an existing artifact you must pass its URL; find it with the list action.

urlaction: "list"
What

The Artifact tool's instructions now state that only the first 8KB of the file is scanned for the <title>, so a title further down will be missed. The guidance for updating an artifact from an earlier conversation was rewritten: find its URL with action: "list" or ask for it, because publishing without url creates a new artifact instead of updating the old one.

Evidence

only the first 8KB of the file is scanned for it

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

Related

Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.

See this entry in the whole of v2.1.227 →