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Notifications (OSC 777)
ESC ] 777 ; notify ; title ; body BELOSC 777 is the rxvt-unicode (urxvt) notification extension, providing structured desktop notifications with separate title and body fields. The sequence
ESC ] 777 ; notify ; title ; body BEL triggers a system notification. Unlike OSC 9 which sends a single message string, OSC 777 separates the title and body, giving notification managers more control over presentation. Originally from rxvt-unicode, it has been adopted by foot, Ghostty, WezTerm, and other modern terminals as a simple cross-terminal notification mechanism.How this is testedpartial
Send
Send
OSC 777 ; notify ; test ; body BEL and verify the terminal consumes the notification 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 3 tested terminals — universal adoption. Part of the Rich TUI baseline.
Supported by 5 of 14 backends (36%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ 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 | |
| Terminal.app | 2.15 | ? unknown |