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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 v2.1.233

--watch-artifact flag to follow a claude.ai artifact from a session

Not switched on
Useful3 Signal5
Artifacts Notable not in their notes

A new --watch-artifact flag follows a claude.ai artifact for new versions and comments, but needs account access.

Artifact watching is fully built behind the tengu_slate_lantern gate, which falls back off, so most accounts see a refusal message.

Feature flag
tengu_slate_lantern On for this account, and not off by default

The flag server returned on for the one account this site reads, and nothing in this release compiles it off by default. The compiled default is shown below, and says which it is when we cannot read one: a fifth of gates compile in a string or a number rather than on or off, and most published releases have no gate table behind them at all. No client can see what the server returns for your account.

This account: on · anonymous baseline: on · compiled default in v2.1.233: on

These values were read against a different version of Claude Code, so treat them as the nearest reading available instead of one taken on this release.

Read once, for one account on one subscription tier, against v2.1.233. It isn't a statement about your account. What a flag value here can and cannot tell you

--watch-artifact--watch-artifact-no-autoreact
What

A new startup flag takes a claude.ai artifact id or URL and watches it for new versions and comments during the session, telling Claude which artifact is the current one of interest. It needs the tengu_slate_lantern gate (fallback off); without it you get "Artifact watching is not available for this account yet."

Details
  • A hidden --watch-artifact-no-autoreact variant arms the watch without automatic comment replies.
  • Both flags are hidden from claude --help, though they parse on every build, and both were added to the lists of flags that take a value and get forwarded.
  • Rejected in non-interactive and print sessions, and in sessions attached to a remote environment; the id is validated against the signed-in environment.
  • Arming prints a feedback line built around "Watching artifact".
Usage
claude --watch-artifact https://claude.ai/public/artifacts/<id>
Evidence

Watch a Claude artifact (id or URL) in this session and hear about new versions and comments

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 v2.1.233 →