Source Intelligence

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.

All of v2.1.239 Home All releases olderv2.1.238 v2.1.240newer
Claude Code v2.1.239

Artifact watching now has an explicit "not available here" state

You'll notice
Useful3 Signal3
Artifacts

Claude is now told plainly when artifact watching isn't available, so it stops falsely promising to watch.

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 v2.1.239: on

Read once, for one account on one subscription tier, against v2.1.239. It isn't a statement about your account. What a flag value here can and cannot tell you

What

Guidance for watching a published artifact is rebuilt around three states: durable in remote sessions, live when the live-watch flag is on, and none otherwise. The none state tells Claude plainly that nothing will notify it when the artifact is republished and that it must not claim to be watching, which stops false "I'll keep an eye on it" answers.

Details
  • The live state is selected by tengu_slate_lantern, which falls back to off absent a server value; CLAUDE_CODE_REMOTE selects durable; otherwise none.
  • Durable watching is described as wake-subscriptions held by the artifact service rather than polling by the session.
  • Remote sessions persist a durable-watch record (artifact_durable_watches) holding watch rows, stopped-monitor timestamps and orphaned trigger ids.
Evidence

artifact_durable_watches

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

See this entry in the whole of v2.1.239 →