Sessions & switching

alt s opens a session switcher — a bordered popup the client draws itself (no external picker, no dependency) — without ever detaching to your shell: type to filter, arrows or ctrl+p/ctrl+k and ctrl+n/ctrl+j to move, Enter to act on whatever’s highlighted, Esc to cancel and stay where you were.

The session you’re switching from always shows a filled ●. “Create a new session” only ever appears as its own explicit row below any matches — typing an existing session’s name never risks silently duplicating it.

This is also how katu start <name> / katu join <name> behave when you’re already inside a session — attaching directly isn’t possible from a nested shell, so the error message points you at alt s instead.