Perch

Perch is a companion to the free Perch app for macOS. It lists every coding agent session across your projects, what each is doing and for how long, and sorts them into needs you, running and idle. Notifications and Live Activities tell you when an agent finishes or asks a question, and you can approve or deny commands from your phone or Apple Watch. Your Mac talks to the phone directly over the local network or Tailscale with no account; Perch Pro adds the full conversation, live updates, replies and alerts away from that network.

Its App Store description says the inner display puts your sessions and a conversation side by side, while the outer display fits everything to the narrower screen. Its maker's site shows the open Duo with session counts and sessions that need you or are running on the left, and an agent's conversation with a reply box on the right.