Features›Device Status›WT_SESSION env variable

WT_SESSION env variable

Category: device · Baseline: rich

$WT_SESSION

The WT_SESSION environment variable is set by Windows Terminal to a GUID that uniquely identifies the current terminal session. A companion variable, WT_PROFILE_ID, identifies the Windows Terminal profile that launched the shell. Applications use WT_SESSION as the canonical way to detect Windows Terminal, since older versions did not set TERM_PROGRAM and the TERM value on Windows is typically inherited from the underlying console host rather than chosen by Windows Terminal itself.

How this is testedmanual
Manual verification required — no automated probe available.

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.

Supported by 0 of 14 backends (0%)

Terminal Applications

Terminal	Version	Support	Notes
iTerm2	3.6.9	? unknown
Ghostty	1.3.1	? unknown
VS Code		? unknown
Warp		? unknown
Cursor		? unknown
Terminal.app		? unknown

Headless Backends

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

Backend	Version	Support	Notes
Alacritty	0.26.0	? unknown
Kitty	0.40.0	? unknown
vt100.js	0.2.1	? unknown
vterm	0.2.0	? unknown
WezTerm	0.1.0-fork.5	? unknown
xterm.js	5.5.0	? unknown

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