A Claude Code environment variable, read out of the shipped bundle.
It has been in the build since v2.1.269, including the newest one read.
Set to 1 to start PowerShell tool commands on Windows directly instead of through the cmd.exe launcher. By default, the launcher lets a PowerShell command running in the backgroundcarry over to the session's next process, such as when you background the session. If you set the variable, a backgrounded PowerShell command stops when the session's process exits. Bash commands aren't affected. Requires Claude Code v2.1.269 or later
v2.1.269in the build not in the build never minedv2.1.322
In the changelogs
0
No changelog entry here has ever named it. That is a statement about what has been written, not about the name: it has been in the build since v2.1.269 without anybody writing a line about it.
First cited
0
No release's published evidence quotes this name. The ledger indexes the Evidence lines of every changelog on this site, so this says nobody here has ever quoted it; it says nothing about how old the name is.
Presence across releases
1
BuildsHow manyDatesReading
v2.1.269 – v2.1.32249 builds11 Sep 2026 → 10 Nov 2026 ◆in the build
Build by build
49
One row per release since the first build this name was read out of. Absent means the build was read and the name was not in it, never mined means no bundle for that release was ever archived, and a declared type or a default is only ever what that release's own bundle stated.
v2.1.32210 Nov 2026·presentverdict: present · bool
Read out of the published npm bundle release by release, and out of Anthropic's own documentation as this site captured it. Nothing on this page is a description anybody here wrote about what the environment variable does. All environment variables.
