Claude Code CLI has an agents view that lets you manage multiple sessions in parallel. I literally only ever start claude with `claude agents` these days, and use left arrow to go back to that view from any single session.

Yeah, I have used that and it's pretty good. For me, keeping up with multiple Claude Code agents got pretty annoying (hard to see which need your attention etc) so I felt like I needed a lightweight UI. I get that that isn't for everyone though.