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.
Artifact relay allows subscribe and unsubscribe calls
Under the hood
Useful2Signal4
ArtifactsNotable
The artifact relay now forwards subscribe and unsubscribe calls, and answers can carry a reply id.
What's wrong with this entry?
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What
The list of routes the artifact relay will forward gains a subscriptions family, POST /subscribe/{slug} and POST /unsubscribe/{slug}. Alongside it, artifact responses must now carry a strict ISO-8601 created_at rather than any non-empty string, and the summon-answer check returns a structured result that can carry a follow-up reply id.
Evidence
POST /subscribe/{slug}
Strings lifted out of the shipped bundle, so the claim above can be checked against them.