XTGETTCAP (Query Terminfo)

Category: device · Tags: Xterm Extensions

XTGETTCAP (DCS + q Pt ST) queries terminfo capabilities via DCS escape sequences. The terminal responds with the capability value, allowing applications to query terminal features without parsing terminfo databases. Used by notcurses and foot.

How this is tested: Send DCS + q 544e ST (hex-encoded query for TN capability), check for a DCS response.

Supported by 4 of 12 backends (33%)

Terminal Applications

Terminal	Version	Support	Notes
iTerm2	3.6.9	? unknown
Ghostty	1.3.1	? unknown
cmux	0.62.2	? unknown
Kitty	0.46.2	? unknown
VS Code	1.112.0	? unknown
Warp	0.2026.03.18.08.24.03	? unknown
Cursor	2.6.21	? unknown
Terminal.app	2.15	? unknown

Headless Backends

Parser correctness only — a ✓ means the parser accepts the sequence.

Backend	Version	Support	Notes
Alacritty	0.26.0	✓ yes
vt100	0.2.1	✓ yes
vterm	0.2.0	✓ yes
WezTerm	0.1.0-fork.5	✓ yes

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