What
Artifacts can carry comment threads, and Claude Code asks for your approval before Claude reads them. The code that makes that decision has been reworked into a shared routine that also handles replies to a thread. The approval prompt still begins "Claude wants to read the comment threads on".
Why
The way Claude Code decides when to ask about comment threads is now shared with the reply case. Watch the wording of the prompt you see when Claude reads comments after a new-comments notification, since that case was handled separately before.