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`tty7 split` spawns the shell and only then asks the tree to hold it, so any refusal in between leaves a pane running that nothing references — `pane ls --all` shows it, the tree does not, and `pane close --orphans` is the only way to be rid of it. Two attempts at `--ratio nan` left two. NaN is the case that gets there, because it cannot be serialised onto the control connection at all. The link drops mid-request, so the daemon's own "a split ratio must be a finite number" never comes back: the caller sees "control connection lost (request 2)" instead, which says nothing about the ratio, and the pane is already running. Refuse a non-finite ratio before the spawn, in the daemon's own terms. Its clamp to a usable range is deliberate and stays its business — 0, 1 and 5.0 still land on the clamp, as intended; this only refuses what the daemon would refuse anyway. Then take the pane back down if the split fails for any other reason too. Nobody asked for a pane that no tree holds, and leaving it for the user to find with `--orphans` is not a refusal, it is a mess. Verified against a live server: two refused splits now leave the pane count where it was, and a valid `--ratio 0.3` split still works. Swept the rest of the value-taking flags while here, all sound: `-m` on an unknown machine, `--key` on an unknown key (which lists the real ones), `--timeout 0` (exits 124, the conventional code) and a negative timeout are each refused with the right message.
tty7
A terminal workbench: persistent sessions, remote work, agents.
Pure Rust · GPU rendering on Zed's gpui · VT core from Alacritty
English · 简体中文
Why
- Performance — ~2× the throughput of Alacritty, Ghostty, or Kitty (benchmarks)
- Persistent sessions — quit or reboot; your shells and supported agent sessions keep running, no tmux
- Editor-grade input — suggestions, completion, highlighting, history search
- Remote development — files, repos, panes, and git data stay on the remote machine
- Native SSH — profiles, SFTP, port forwarding, and jump hosts
- Agent-aware — Claude Code, Codex & co.: status, notifications, git context
- CLI + Skills — agents create panes, run commands, and inspect output
Install
Native builds for macOS, Windows, and Linux on Releases:
| macOS | …-macos-arm64.dmg · …-x86_64.dmg |
drag into Applications |
| Windows | …-setup.exe · portable ….zip |
|
| Linux | …-x86_64.AppImage |
chmod +x and run — X11/Wayland libraries bundled |
What's inside
| Editor-grade input | ghost suggestions from history · explained tab completion · syntax highlighting · multi-line editing · click places the caret · ⌃ R fuzzy history |
| Window | tabs & splits · ⌘ P palette · ⌘ F scrollback search · nine themes · IME |
| Agent-aware | per-pane detection (18 CLIs): status dot · notifications · branch + diff · resume after reboot · tray icon when input is needed |
| Remote workspaces | remote files, repos, changes, diffs, worktrees, tabs, and panes · reconnect from any client and continue where you left off |
| CLI + Skills | bundled tty7 CLI · agent skill · pane/workspace control · real PTY commands · output, process, port, and agent status |
| SSH | native russh stack: profiles with keychain secrets · SFTP panel · port forwarding · jump hosts · one-time, unprivileged tty7-server install |
Full documentation lives in docs/ —
keyboard shortcuts ·
config.json ·
CLI reference. The agent-facing CLI interface is also
documented in skills/tty7/SKILL.md.
Install the skill with:
npx skills add l0ng-ai/tty7 # install
npx skills update tty7 # update later
Benchmarks
Same machine, same day, same 155×40 grid — Apple M1 Pro, macOS 26.3.1, five-run averages (2026-07-04):
| tty7 | Alacritty | Ghostty | Kitty | |
|---|---|---|---|---|
Plaintext I/O — 11 MB cat (lower = better) |
95 ms | 239 ms | 179 ms | 185 ms |
| DOOM-fire frame rate (higher = better) | 888 fps | 485 fps | 552 fps | 617 fps |
| Cold-launch memory | 116 MB¹ | 105 MB | 128 MB | 130 MB |
¹ GUI 105 MB + the persistent server 11 MB.
Methodology and one-command reproduction: scripts/bench/.
Built on gpui and alacritty_terminal · Apache-2.0 · Discord · Changelog