Run a coding agent in a terminal and you sit with it, because sooner or later it stops and asks. That works for one. It does not work for twenty, and twenty is what happens the moment agents become useful.
Exa Fleet is a console for the second case. A vertical rail lists every live session across every machine. Nine tabs might be three machines running three sessions each. Click one to read what it is doing and talk to it.
Nothing to keep open
There is no terminal to leave running and no SSH session to lose. The machines hold the sessions; the console is a view onto them. Close the browser and come back tomorrow and the work is still there.
Noticeable without watching
A session that needs you signals on three channels at once — fill, glyph and motion — because motion is what peripheral vision actually catches. The count of blocked sessions rides in the browser tab title, so a session that stops while the window is behind something else still says so. A keyboard shortcut walks the blocked queue.
The cue clears when you answer, not when you glance at it. Different block kinds are marked differently, because a question and a destructive approval carry different urgency and cost you different amounts of attention.