Artifact-read failures now give channel-aware guidance for Slack and Teams: a 403 can report that the artifact is agent_not_added or agent_owned by another channel's Claude, and instructs the user to add the Slack or Teams channel under Share settings instead of sharing with an individual.
Artifacts can be shared with a chat-channel's Claude (Slack/Teams)
Artifact read failures now explain when the artifact belongs to another channel's Claude and to add the Slack or Teams channel.
You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
4Signal: worth watching, 1 to 5
ArtifactsArea: what it touches
ImprovementsKind: in v2.1.257,
What probably matters to youSection of the release