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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 v2.1.239

Live-document collaboration note added to the artifact instructions, but nothing can reach it

Not switched on
Useful1 Signal4
Artifacts

A live-document collaboration note for artifacts exists but its gate is always closed.

The note depends on a live-document streaming module set to null, so it never appears.

What

A new helper appends a collaboration note to the artifact instructions, gated on a live-document module reporting that its streaming gate is open. That module is set to null in this build, so the gate is always false and the note never appears.

Details
  • The helper reads two texts, NO_WATCH_RAIL_COLLAB_NOTE and LIVE_DOC_RESULT_PREFIX, off the same null object and calls liveDocStreamGateOpen() on it through optional chaining, which yields undefined.
  • The same null also makes the live-edit action and the live-document result prefix dead code. The previous build's counterpart was null too.
  • This is a build-time null, not a remote flag: no server setting can switch it on.
Evidence

NO_WATCH_RAIL_COLLAB_NOTE

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 →