Under the hood
Artifact comments now show a label distinguishing one sent to Claude from one sent to someone else's own Claude session
What
Artifact comments now carry a label that says whether a comment was sent to Claude (which requires being able to edit the artifact) or sent to the commenter's own separate Claude session.
Why
This makes it clear at a glance who a comment is actually directed at, and reflects that only people with edit access to an artifact can address Claude directly through a comment.