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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 v2.1.247

Artifacts can wait for their first write before opening

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Artifacts not in their notes

Artifacts can hold off opening until real content lands, with auto_open set to after_first_write.

auto_openafter_first_write
What

Creating an Artifact from a type can now pass auto_open: "after_first_write", which holds back opening it for you until content actually lands, so you no longer watch an empty page. The pending open is parked per Artifact and flushed by the first successful write, or consumed by a later publish of files. Validation rejects the value when there is nothing to wait for, such as a publish that is itself the first write.

Details
  • The alternative value is at_create, the previous behaviour of opening immediately.
  • No separate flag for auto_open was found; it rides on the existing Artifact type-creation schema.
Evidence

after_first_write

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

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