"Welcome home, Jack."
A desktop workspace for coding agents.
Download • Build from source • Architecture notes
I'm a developer with more than 15 years of experience, and I have worked in IDEs that whole time. My favourite would change every few years, and I always had a close bond with whichever IDE I considered the best fit for me at the moment.
Bit by bit, though, I noticed that I was doing more and more of the actual work inside the agent (Claude, opencode or Codex), and only looked at the git diff once a feature was done to see what had changed and whether those changes matched what I wanted. That shifted the way I work quite far from how I used to go about it. Where I once spent most of my time in the code editor, it was now individual Claude sessions I had to click through and, of course, the checking glance at git.
New problems came with that: which session in which project has just finished, which prompt needs my attention, where is the git diff I'm supposed to look at now.
With TET I wanted a fresh start, one where the agents are at the centre, rounded out with the features that are a bit awkward in a plain terminal, like drag and drop for files and images.
With TET you always know which session in which project has just finished and which one needs attention.
TET is not a plain multiplexer that just shows several consoles side by side. The agents are integrated and come with a carefully built notification system as well as features that make the work easier or extend it (image and file drag and drop, for one).
And the best part: the git diff is one click away to look over and check.
Claude Code, opencode and Codex CLI run as first-class terminal tabs; not a wrapper, the actual CLI in a real pty. TET reads each agent's own session state and shows, on the tab and on the project row, whether a turn is working, stopped for an answer, or finished while you were looking elsewhere. List, resume, rename and delete past sessions from the tab's menu. Drag files or images straight onto a terminal; ctrl-click a path in the output to open it.
Split a project's terminals into up to four panes; five fixed presets (single, columns, 2×2 …), each pane with its own tab strip. See the agent, the dev server and a shell at once instead of cycling tabs.
A toggle in the tab strip slides out a pane between navigation and terminals; the branch
tree (branches, remotes, tags, stashes) over the files the agent changed; and stays out
until you press it again, so a terminal and the repository stay on screen together. Checkout,
fetch/pull/push, commit-all, discard (to the trash, not rm), .gitignore from a right-click.
Clone from GitHub or GitLab in the add-repository dialog.
Double-click a changed file, or ctrl-click a path in a terminal, for a full-window diff. Images diff as images; whitespace toggles off; unfold context on demand. The same view doubles as a plain code editor (Monaco) for a quick look-and-fix without leaving TET.
Desktop notifications when a turn ends or needs input, with a guard so a turn that only launched a subagent doesn't count as done. Alongside them, an always-visible read of what's waiting and what finished out of sight, on every project row.
The sidebar's lower half is a project's saved shell commands, kept in a tet.json in the
repository root; so they travel with the repo and can be committed. Run one and it opens a
terminal tab whose process is the command.
VS Code's Dark Modern palette by default, plus more themes; each agent can be told to draw in TET's theme or left to its own.
Grab the latest release for Windows,
Linux (AppImage / .deb) or macOS. Windows and the AppImage update themselves on the next quit;
they never force it, since a terminal tab is a live agent session.
git clone https://github.com/samil-kale/tet.git
cd tet
npm install
npm startOther scripts: npm run compile, npm run typecheck, npm run lint, npm test.
TET needs git on your PATH, plus at least one supported agent; Claude Code,
opencode or Codex CLI; or just a shell. It checks on startup and tells you exactly what's
missing.
TET is Electron + React + xterm.js. Git is never reimplemented; it wraps the local git
CLI in its own process so typing in a terminal stays smooth. Each agent is described by one
definition and lives in its own folder; the three are treated as three separate products that
happen to share a kind of tab, because every time the same question was put to all of them, the
answers differed.
The design decisions, and the things that were built and deliberately taken back out, are written down in CLAUDE.md.
Issues and pull requests welcome. Run npm run typecheck, npm run lint and npm test before
opening one. On Linux the app tests need a display (xvfb-run).