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Request Setting (DECRQSS)
ESC P $ q setting ESC \\DECRQSS (DCS $ q Pt ST) queries the current value of a terminal setting. For example, querying DECSCL returns the current conformance level. Useful for terminals that want to verify their configuration programmatically.
Analysis2026-03-26
Supported by 5 of 8 terminals (63%). Not supported by: Kitty, Terminal.app, Warp. Part of the Rich TUI baseline. Notes: Kitty: Headless mode has no output stream for DECRQSS responses.
Supported by 6 of 13 backends (46%)
Terminal Applications
| Terminal | Version | Support | Notes |
|---|---|---|---|
| iTerm2 | 3.6.9 | ✓ yes | |
| Ghostty | 1.3.1 | ✓ yes | |
| VS Code | 1.112.0 | ✓ yes | |
| Cursor | 2.6.21 | ✓ yes | |
| tmux | 3.6a | ✓ yes | |
| Warp | 0.2026.03.18.08.24.03 | ✗ no | No DECRQSS response |
| Kitty | 0.46.2 | ✗ no | Headless mode has no output stream for DECRQSS responses |
| Terminal.app | 2.15 | ✗ no | No DECRQSS response |
| GNU Screen | 5.0.1 | ✗ no | Screen does not support DECRQSS (setting reporting) |
Headless Backends
Parser correctness only — a ✓ means the parser accepts the sequence.
| Backend | Version | Support | Notes |
|---|---|---|---|
| vterm | 0.2.0 | ✓ yes | |
| Alacritty | 0.26.0 | ~ partial | Headless mode has no output stream for DECRQSS responses |
| WezTerm | 0.1.0-fork.5 | ~ partial | Headless mode has no output stream for DECRQSS responses |
| vt100 | 0.2.1 | ✗ no | No output stream — pure TypeScript emulator |