You'll noticeTier: how much it should matter to you
3Useful: my rating, 1 to 5
3Signal: worth watching, 1 to 5
Session MessagingArea: what it touches
ImprovementsKind: in v2.1.323,
ImprovementsSection of the release
What
A session is one running Claude Code conversation, and one session can send messages to another. If a session keeps replying to other sessions in a way that looks like an automatic loop, Claude Code now refuses to deliver the message. It returns a note saying the message was not delivered because this session keeps answering other sessions.
Sending stays paused until you enter your next prompt in that session.
Why
It stops two sessions from replying to each other back and forth on their own without end. If messages between sessions stop arriving, typing a new prompt lets sending resume.
