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Set Wayland app-id (OSC 176)
ESC ] 176 ; app-id BELOSC 176 sets the Wayland window's app-id at runtime. The sequence is
ESC ] 176 ; app-id BEL and is specific to foot, the Wayland-native terminal emulator. Wayland window managers use the app-id to group windows, apply per-application rules, and select icons — analogous to WM_CLASS on X11. By exposing app-id setting as an escape sequence, foot lets shell scripts and TUIs differentiate themselves at the compositor level (for example, marking a terminal running a specific TUI so a tiling window manager can place it on a dedicated workspace). No other terminal implements OSC 176; on non-foot terminals the sequence is silently consumed or ignored.How this is testedpartial
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OSC 176 ; terminfo-test BEL and verify the terminal consumes the sequence (cursor position unchanged).The same probe runs against headless backends (via Termless) and real terminal apps (via a daemon launched in each terminal). This lets us distinguish parser correctness from rendering correctness.
Analysis2026-04-06
Supported by all 4 tested terminals — universal adoption. Part of the Rich TUI baseline.
Supported by 6 of 14 backends (43%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| Terminal.app | 2.15 | ✓ yes | |
| Kitty | 0.46.2 | ✓ yes | |
| VS Code | 1.113.0 | ? unknown | |
| Warp | 0.2026.03.18.08.24.03 | ? unknown | |
| Cursor | 2.6.21 | ? unknown |