Active Sessions lists every session that is doing something right now, each with a status dot and a label. You see what is working, what is queued and what has stopped, without opening a single one.
A session appears the moment it starts working and stays until you have seen the result. Close its tab and it keeps going in the background.
Orange and pulsing means thinking. Green means a message is queued. Red says Error or Stopped in words, so you read the label and not just the color.
A run that breaks turns red and says Error, so you find a crash or a rate limit in seconds instead of discovering it an hour later.
Five sessions across three projects: some thinking, one queued, one stopped. Active Sessions puts them in one list in the sidebar, so you check on all of them without hunting through tabs.
One session in the Mainframe. Every device is a window onto it, not a copy of it.
One switch on the Active Sessions bar pauses every queue. Replies already in flight finish, manual sends still work, and the pause holds across restarts until you switch it back.
All of it lives with the session, not in a local dotfile.