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The hashed-host test builds its line with the same `hmac_sha1` it then checks, so it holds whether or not that agrees with anyone else. The digest is not the gap -- `sha1_matches_known_vectors` and `hmac_sha1_matches_rfc2202_vector` pin it against outside vectors, and breaking one SHA-1 constant fails all three tests, which is how I checked. The gap is everything wrapped around the digest: base64 in the order this file reads it, `|1|` splitting where OpenSSH puts the separator, and `host_token` spelling a non-default port the way ssh-keygen does -- `[example.com]:2222`, brackets and all. Nothing pinned that, and getting it wrong makes every hashed entry for a non-22 host read as a host never seen before. Not a wrong trust, but a user with `HashKnownHosts` on would meet the prompt at every connection. So both prefixes here came out of a real `ssh-keygen -H` run and are matched end to end. They pair with this file's own key because the digest covers the host token alone. Checked while reading the surrounding logic, which needed nothing: revoked entries are consulted first and outrank everything, `@cert-authority` lines are skipped where they would name the wrong key, a same-algorithm mismatch outranks a different-algorithm one, and `!negation` short-circuits the whole comma-separated list the way OpenSSH does.
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 the app and your shells keep running; after a reboot the layout comes back and supported agent conversations resume, 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