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OSC 633;B prompt end
ESC ] 633 ; B BELOSC 633;B marks the end of the shell prompt and the start of the user's command line, mirroring OSC 133;B. VS Code uses this to identify where the prompt ends and the editable command region begins.
This is essential for VS Code's command decoration system: it lets the terminal draw decorations alongside the prompt without overlapping the user's input area, and lets it correctly identify which characters in scrollback are prompt vs command.
How this is testedpartial
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OSC 633 ; B BEL and verify the terminal consumes the sequence (cursor doesn't advance, terminal remains responsive).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 9 tested terminals — universal adoption. Part of the Rich TUI baseline.
Supported by 11 of 14 backends (79%)
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 |