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Enabling `kitty_keyboard` (#184) made an upstream `alacritty_terminal` bug reachable from any foreground program. `push_keyboard_mode` caps its stack by removing from `title_stack` instead of `keyboard_mode_stack` -- a copy-paste slip from `push_title` that compiles because both are `Vec`s and the removed value only feeds a `trace!`. Two consequences. Each overflowing push silently drops a saved window title, so a later XTPOPTITLE restores the wrong one. And once the title stack is empty, `Vec::remove(0)` panics: 4097 unpopped `CSI > 1 u` pushes -- roughly 20KB of output -- kill the `tty7-remote-reader` thread and freeze the pane. The depth cap never trimmed `keyboard_mode_stack` at all, so it was doing nothing. Hostile output is not required. A TUI that pushes without popping (per redraw, per keypress) reaches 4096 on its own in a long session. Pin our fork of Zed's fork instead: `tty7` is Zed's `fcf32fe` plus the one-word fix. No `[patch]` section is needed -- tty7 is the only crate in the tree that depends on `alacritty_terminal`, so a plain URL/rev swap cannot split it into two incompatible copies the way the gpui pin would. The regression test guards the pin rather than our own code: it pushes past the 4096 cap and then queries, using the reply as a liveness probe. Verified to fail against the unpatched rev. Still present on alacritty master as of 852e971. Drop the fork once it lands upstream.
tty7
A terminal workbench: shells, sessions, SSH, coding agents.
Pure Rust · GPU rendering on Zed's gpui · VT core from Alacritty
English · 简体中文
Why
- Fast — ~2× the throughput of Alacritty, Ghostty, or Kitty (benchmarks)
- Sessions persist — quit or reboot; your shells keep running, no tmux
- Editor-grade input — completion, syntax highlighting, history search built in; zero config for zsh, bash, fish, PowerShell
- Agent-aware — recognizes Claude Code & co. in a pane: status, notifications, session resume
Install
Native builds for each platform 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 libs bundled |
What's inside
| 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 · eight themes · IME |
| Coding agents | per-pane agent detection (~17 CLIs): status dot, notifications, branch + diff, resume after reboot, tray icon that signals "needs your input" |
| SSH | native russh stack: profiles with keychain secrets, SFTP panel, port forwarding, jump hosts |
Details for every row: docs/features.md. Keybindings: ⌘ , opens Settings — browse and remap everything, tmux preset included (full list).
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 IO — 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 daemon 11 MB.
Methodology and one-command reproduction: scripts/bench/.
Built on gpui and alacritty_terminal · Apache-2.0 · Discord · Changelog