Nothing to try yetTier: how much it should matter to you
2Useful: my rating, 1 to 5
5Signal: worth watching, 1 to 5
ArtifactsArea: what it touches
In DevelopmentKind: in v2.1.238,
What probably matters to youSection of the release
A room capability and room_send broadcast, plus the verify diagnostics action, are declared in the tool schema rather than turned on.
What
The artifact tool can declare a room capability, an at-most-once broadcast channel to whoever is currently viewing the page, sent with room_send carrying a topic and data, alongside the verify action that reads runtime diagnostics viewers' browsers captured for the current version.
Details
Both are feature-detected from the tool schema itself: rooms by whether topic is in the argument shape, verify by whether the action list contains it. Rooms additionally require the room module to be compiled in and to report enabled.
On builds where the schema does not carry them, they simply do not exist. These are not settings you can flip.
Permission checks fail closed: a room_send, or a publish that declares a room, whose check throws is denied.
The verify prompt insists that a result with no viewers is not evidence of a clean render.
Evidence
__artifactRoomJoinDisclosed
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
