[Bug] CoPilot Chat is unable to invoke commands when `pwsh` is the default shell, because its mandatory wrapper prepends POSIX `$Env:PATH` assignments to every invoked command.

#### Whether This Issue Recurs When All Extensions Are Disabled

I have yet to ascertain this.

#### VS Code Version

-

~~~YAML
Version: 1.137.0-insider
Commit: de8cc55dae905582f191fdcfb6dff8c811a743c4
Date: 2026-09-04T15:53:39Z
Electron: 42.10.0
ElectronBuildId: 15109253
Chromium: 148.0.7778.280
Node.js: 24.18.1
V8: 14.8.178.38-electron.0
@github/copilot: 1.0.83-2
@github/copilot-sdk: 1.0.13-preview.4
OS: Linux x64 7.1.13-200.fc44.x86_64
~~~

- 1.

~~~python
#!/usr/bin/env python3
import rpm, yaml
from datetime import datetime, timezone
from shutil import which
package = which("code-insiders")
header = next(
rpm.TransactionSet().dbMatch(
"basenames",
package
)
)
tags = (
"NAME",
"VERSION",
"RELEASE",
"ARCH",
"INSTALLTIME",
"SIZE",
"SIGPGP",
"SOURCERPM",
"BUILDTIME",
"BUILDHOST",
"PACKAGER",
"VENDOR",
)
properties = {}
for name in tags:
value = header[
getattr(
rpm,
f"RPMTAG_{name}"
)
]
if name in (
"INSTALLTIME",
"BUILDTIME"
):
value = (
datetime.fromtimestamp(
value,
timezone.utc
)
.isoformat(timespec="seconds")
.replace(
"+00:00",
"Z"
)
)
properties[name] = value
print(
yaml.safe_dump(
properties,
sort_keys=False,
default_flow_style=False,
)
)
~~~

1.

~~~YAML
NAME: code-insiders
VERSION: 1.137.0
RELEASE: 1788539840.el8
ARCH: x86_64
INSTALLTIME: '2026-09-04T22:53:37Z'
SIZE: 1031125129
SIGPGP: !!binary |
iQEcBAABCAAGBQJqmvTwAAoJEOs+lK2+EinPa1EH/3ggnCmqlwa+CfaE3oFlp423JdmWx4BFF2fd
zt6qlR2/5SlGlzUFq2fqm35cpZkcwRIstIvDZG/8czJSe/Z9INYggK0cy9kzEiltEfDqzGoeRpa9
Y88jbWYc/4t0GWe+LooZdxAU/Inx3jKQKIDoI4k/t8np9HvOIikQGthh9RiLba07yDMR/BpQq2dm
uJYUDLSGbh3BoyTvdmTbfMguDOJNgAcXD6l9XYQrRrOt2/UMqjYeIH85COf2jvKrqjGKoRQ5xU9L
AK527aJ/ulfvAQ5Sz1gn64ULRsBERNEhXQsesBt1W7ZINsKFKWi0i6R3RVztwpZzYu9SnhLG129D
opg=
SOURCERPM: code-insiders-1.137.0-1788539840.el8.src.rpm
BUILDTIME: '2026-09-04T16:37:24Z'
BUILDHOST: 21a4ed8ec000005
PACKAGER: Visual Studio Code Team
VENDOR: Microsoft Corporation
~~~

#### OS Version

1.

~~~powershell
#!/usr/bin/env -S pwsh -File
$OSRelease = [Ordered]@{}
Get-Content /etc/os-release | ForEach-Object {
If ($_ -Match '^\s*([^=]+)=(.*)$') {
$Name = $Matches[1]
$Value = $Matches[2]
If ($Value -Match '^"(.*)"$') {
$Value = $Matches[1]
}
If ($Value -Match '^[0-9]+$') {
$Value = [Int64]$Value
}
$OSRelease[$Name] = $Value
}
}
[PSCustomObject]$OSRelease |
Select-Object NAME, VARIANT, VERSION_ID |
Format-List |
yq -P
~~~

1.

~~~yaml
NAME: Fedora Linux
VARIANT: KDE Plasma Desktop Edition
VERSION_ID: 44
~~~

#### Steps To Reproduce It

During one of my conversations, the LLM stated, whilst thinking, that:

> The integrated terminal is still failing before it reaches `git`, due to the wrapper’s `PATH` parsing.

Consequently, I asked it:

> You state that my terminal is failing; are you able to provide me with the full command and its output?

It responded with:

Yes. The failing wrapper command was:

~~~sh
cd '/home/beedell.roke_julian_lockhart/.vscode-insiders/tmp/tmp_vscode_2'; ELECTRON_RUN_AS_NODE=1 PATH="$PATH:/usr/share/code-insiders/resources/app/node_modules.asar.unpacked/@vscode/ripgrep-universal/bin/linux-x64" TMPDIR="/home/beedell.roke_julian_lockhart/.vscode-insiders/tmp/tmp_vscode_2" CLAUDE_TMPDIR="/home/beedell.roke_julian_lockhart/.vscode-insiders/tmp/tmp_vscode_2" "/usr/share/code-insiders/code-insiders" "/usr/share/code-insiders/resources/app/node_modules/@vscode/sandbox-runtime/dist/cli.js" --settings "/home/beedell.roke_julian_lockhart/.vscode-insiders/tmp/tmp_vscode_2/vscode-sandbox-settings-de011741-1752-4a15-9a27-53590a592ade.json" -c 'cd '\''/home/beedell.roke_julian_lockhart/Documents/softwareThatLacksPathSanitisation/git/cSharpQt'\'' && dotnet run --property:QtDir=/tmp/qt-prefix'
~~~

The command it was attempting to run was:

~~~sh
dotnet run --property:QtDir=/tmp/qt-prefix
~~~

The output was:

~~~YAML
ParserError:
Line |
1 | … siders/tmp/tmp_vscode_2'; ELECTRON_RUN_AS_NODE=1 PATH="$PATH:/usr/sha
| ~~~~~~
| Variable reference is not valid. ':' was not followed by a valid variable name character.

PS /home/beedell.roke_julian_lockhart/Documents/softwareThatLacksPathSanitisatio
n/git/cSharpQt>
~~~

The important detail is that the error occurs while PowerShell parses the wrapper’s `PATH="$PATH:/usr/..."` expression. `dotnet run` itself is never reached.

[^1] [^2]

[^1]: [`forum.qt.io/post/839999`](https://forum.qt.io/post/839999)

[^2]: [`orgs/community/discussions/129888#discussioncomment-12917705`](https://github.com/orgs/community/discussions/129888#discussioncomment-12917705)

It advises `bash`, in `pwsh`'s stead. However, I should be able to utilise Microsoft's shell in Microsoft's IDE with Microsoft's programming languages.