What it is

A background server, the daemon, owns every program and its terminal. The window (insensical) and the command line (isc) are its clients. Closing the window doesn't stop anything. Open it again and everything is still there.

Panes, tabs and splits are real UI elements, not characters drawn inside one terminal. A program's output goes to the window untouched. It isn't redrawn.

What it does:

• Keeps programs running when no window is open, and through an update to a new version.
• Brings back every project, tab, split, floating pane and minimized pane after the daemon has been stopped. Each pane comes back in its directory, showing what it showed before.
• Groups tabs into projects. A sidebar lists them as a tree of projects, tabs and panes.
• Lets you float any pane above the layout, or minimize it to a dock while its program keeps running.
• Shows on every pane whether its program is working, waiting for you, done or failed. It counts the panes that need you, and one key takes you to the most urgent.
• Sends a desktop notification when a pane starts waiting, finishes or fails, unless you're looking at it.
• Does everything the window does from the command line too.

How far it has been checked

Read this before you rely on it.

• Linux. Everything described here is built and covered by tests, including tests that drive the real application off-screen. The application is in daily use in a real window on Arch Linux under Hyprland, at a fractional scale of 1.33. The most recent additions have been checked off-screen only, not in a real window: moving the daemon to a new version in place, panes showing what they showed after a stop, the scratch pane, the overview, finding a file, the list of what follows the leader, the offer to set agents up, and dragging tabs. Where that matters most, this manual says so.
• macOS. It builds on a Mac and its tests pass there, including the window's tests, drawn off-screen (macOS 26.6.2, Apple silicon). A development build has been opened in a real window there, looked at, and had its main keys pressed. The application has also been installed from the source, updated in place, quit and brought back. Nobody has done real work in it. Every statement about macOS in this manual marked "never run" is unverified; docs/macos.md lists what was checked.