Group of 2 Under the hood
Artifact comment threads mark when their anchor moved and avoid duplicate auto-replies when that happens
What
- Comment threads on artifacts now distinguish the page content "as it read when the thread was placed there (or last moved by its author)" from the old behavior of only remembering how the page read when the comment was first made.
- A thread's status line now shows a new marker with the UTC time the thread was moved to a different part of the artifact, with a warning that older replies may refer to the earlier location.
- The auto-reply logic for artifact comments recognizes a new "moved" trigger reason when the active anchor comment changes, and adds a handoff so two coordinating processes don't both react to the same move.
Why When a comment thread's anchor moves to a different part of an artifact, readers and Claude Code itself now get a clear signal about it, so old replies aren't mistaken for referring to the current location, and the system avoids sending duplicate automatic replies about the same move.