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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 v2.1.219

read_page_data refuses unknown interaction schemas

You'll notice
Useful2 Signal0
Artifacts not in their notes

Artifact page-data reads now reject unknown schemas up front and list valid options instead.

read_page_data
What

The artifact read_page_data action validates the requested schema against what the session actually offers and fails with a dedicated error code instead of attempting a lookup.

Details
  • The check runs before any lookup and throws its own error code on mismatch.
  • The tool description is generated with the concrete list of available schema names inlined, so the model sees valid options up front.
Evidence

read_page_data: the requested interaction schema is not available in this session.

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 v2.1.219 →