What
When listing comments on an artifact, Claude Code can now compute and display extra "presence" information for each comment, such as who is currently viewing or typing. This is only added when it fits within the response's overall size limit, and is tracked with new presenceText and presenceShown fields.
Why
This gives more collaborative context on comment threads when there's room to show it, without pushing a response over its size limit when there isn't.
Names in the bundlepresenceTextpresenceShown