Terminals

Jun's terminals run your login shell. Agents such as Claude Code, Codex and Pi run inside them as they would in any terminal.

What a terminal is

Shell: your login shell, started in the project's directory. The directory belongs to the tab: cd inside the shell does not change the project.
Rendering: MyGo's Ghostty plugin, on the GPU. It supports input method composition, copy and paste, scrolling and resizing.
Scrollback: 10 MiB per terminal.
Text size: shared with file tabs, 13 by default. ⌘+ and ⌘− change it, ⌘0 goes back to 13, and Jun saves it as font.size in the settings file.
Theme: Jun's own, or any Ghostty theme, including those in ~/.config/ghostty/themes. See Settings.
No AI of its own: Jun makes no AI API calls. It runs the CLIs you have installed.
Agent tools: each terminal has JUN_API, JUN_BIN and JUN_TERMINAL set, for programs in it to ask Jun about its terminals. See Agent tools.

These keep the shell running:
- switching projects or perspectives;
- hiding a region;
- moving the tab;
- closing the tab.
⋯ → Reopen Terminal lists the current project's closed terminals. It reopens the same session, with its output and scrollback.
The Agents view lists agents in closed tabs as well; clicking one reopens its terminal. See Agents.

A shell that exits (exit, ⌃D, or the process ending, with any exit code) closes its tab and ends its session. It cannot be reopened.
A command that returns to the shell leaves the tab open.
A shell that ends in the background does not change the project, perspective, regions or focus.
When the focused shell ends, the focus goes to the tab to its right, else the one to its left. A region left empty stays open, with its menu focused.
A shell that fails to start keeps its tab, which shows the error and a Retry button.

Quitting Jun, or closing its window, ends every shell. Jun has no background daemon.
When programs still run in some terminals, Jun lists them first ("codex — project · tab") and asks. Cancel takes Enter and Esc.
On the next start, Jun starts a fresh shell for every saved terminal tab, in each tab's own project directory. This includes tabs in hidden regions and in other projects and perspectives.
Earlier processes and their output are not restored.
A directory that no longer exists keeps its tab, with a Retry button.

The packaged app includes libghostty-vt.
Development runs (go run, go test) download the pinned library into MyGo's cache on first use, and check its SHA-256.
If the library cannot load, Jun stops at startup with an error.