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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 21 Aug 2026

Artifact watch prompts say how the watch is being kept alive

You'll notice

Useful2 Signal3

Artifacts

Artifact watch prompts now name the mechanism keeping the watch alive.

What

Permission prompts and tool descriptions for watching an artifact now name the mechanism in use: a durable wake subscription held by the artifact service, a background connection to claude.ai, or watching not being available in this session at all. A durable subscription registered before the session restarted is called out as not re-verified since, with a note that no action is needed.

Details

Wording changed from "another session republishes this artifact" to "this artifact is republished elsewhere".
Which mechanism is reported comes from the session's own capability checks, not a setting.

Evidence

Durable wake subscription: registered before this session restarted and not re-verified since (no action needed unless the user asks)

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 →