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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 26 Aug 2026

Artifact create results say when the Artifact was opened

Under the hood

Useful1 Signal2

Artifacts

Artifact results now record whether the Artifact opened at creation or after the first write.

What

A created-from-type Artifact result now carries an auto_open field of "at_create" or "after_first_write", telling the model at which point the Artifact was shown to you.

Details

Auto-open can still be switched off per environment with CLAUDE_CODE_ARTIFACT_AUTO_OPEN, logged as auto_open_skipped_env.
Other recorded skip reasons cover background runs, teammate sessions, remote sessions, the desktop pane and the VS Code pane.

Evidence

auto_open: un(["at_create", "after_first_write"]).optional(),

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

See this entry in the whole of v2.1.247 →