Selecting a pixi interpreter fails

[Jaapel]

Type: Bug

Behaviour

Run any python test, debug process or anything python related using pixi runs into the line (python output):

> /opt/homebrew/bin/pixi shell --manifest-path ./pixi.toml && echo 'e8b39361-0157-4923-80e1-22d70d46dee6' && python ~/.vscode/extensions/ms-python.python-2025.12.0-darwin-arm64/python_files/printEnvVariables.py

Steps to reproduce:

1. Install pixi
2. select pixi python as interpreter
   Get error:

[error] getActivatedEnvironmentVariables [Error: Command failed: /opt/homebrew/bin/pixi shell --manifest-path </path/to>/pixi.toml && echo 'e8b39361-0157-4923-80e1-22d70d46dee6' && python /Users/<me>/.vscode/extensions/ms-python.python-2025.12.0-darwin-arm64/python_files/printEnvVariables.py

	at genericNodeError (node:internal/errors:983:15)
	at wrappedFn (node:internal/errors:537:14)
	at ChildProcess.exithandler (node:child_process:416:12)
	at ChildProcess.emit (node:events:530:35)
	at maybeClose (node:internal/child_process:1101:16)
	at ChildProcess._handle.onexit (node:internal/child_process:304:5)] {
  code: null,
  killed: true,
  signal: 'SIGTERM',
  cmd: "/opt/homebrew/bin/pixi shell --manifest-path </path/to>/pixi.toml && echo 'e8b39361-0157-4923-80e1-22d70d46dee6' && python /Users/<me>/.vscode/extensions/ms-python.python-2025.12.0-darwin-arm64/python_files/printEnvVariables.py"
}

Diagnostic data

Output for Python in the Output panel (View→Output, change the drop-down the upper-right of the Output panel to Python)

XXX

Extension version: 2025.12.0
VS Code version: Code 1.103.2 (6f17636121051a53c88d3e605c491d22af2ba755, 2025-08-20T16:45:34.255Z)
OS version: Darwin arm64 24.4.0
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.13.5.final.0
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): System
• Value of the python.languageServer setting: Default

User Settings

languageServer: "Pylance"

testing
• pytestArgs: "<placeholder>"
• pytestEnabled: true

Installed Extensions

Extension Name	Extension Id	Version
autodocstring	njp	0.6.1
cmake	twx	0.0.17
cmake-tools	ms-	1.21.36
cpptools	ms-	1.26.3
cpptools-extension-pack	ms-	1.3.1
cpptools-themes	ms-	2.0.0
debugpy	ms-	2025.10.0
docker	doc	0.15.0
even-better-toml	tam	0.21.2
js-debug	ms-	1.102.0
js-debug-companion	ms-	1.1.3
jupyter	ms-	2025.7.0
jupyter-keymap	ms-	1.1.2
jupyter-renderers	ms-	1.3.0
python	ms-	2025.12.0
remote-containers	ms-	0.422.1
remote-explorer	ms-	0.5.0
remote-server	ms-	1.5.2
remote-ssh	ms-	0.120.0
remote-ssh-edit	ms-	0.87.0
remote-wsl	ms-	0.99.0
ruff	cha	2025.24.0
vim	vsc	1.30.1
vscode-containers	ms-	2.1.0
vscode-docker	ms-	2.0.0
vscode-js-profile-table	ms-	1.0.10
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-jupyter-slideshow	ms-	0.1.6
vscode-pylance	ms-	2025.7.1
vscode-python-envs	ms-	1.2.0
vscode-remote-extensionpack	ms-	0.26.0

System Info

Item	Value
CPUs	Apple M3 Pro (12 x 2400)
GPU Status	2d_canvas: enabled direct_rendering_display_compositor: disabled_off_ok gpu_compositing: enabled multiple_raster_threads: enabled_on opengl: enabled_on rasterization: enabled raw_draw: disabled_off_ok skia_graphite: enabled_on trees_in_viz: disabled_off video_decode: enabled video_encode: enabled webgl: enabled webgl2: enabled webgpu: enabled webnn: disabled_off
Load (avg)	2, 2, 2
Memory (System)	36.00GB (0.08GB free)
Process Argv	. --crash-reporter-id 58d04878-f54e-4761-80c9-3db045c3ade9
Screen Reader	no
VM	0%

A/B Experiments

vsliv368:30146709
pythonvspyt551cf:31249601
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythoneinst12:31285622
996jf627:31283433
pythonrdcb7:31342333
usemplatestapi:31297334
747dc170:31275177
aj953862:31281341
9d2cg352:31346308
nesew2to5:31336538
agentclaude:31350858
nes-set-on:31351930
testaa123:31335226
onetestforazureexpcf:31335614
6abeh943:31336334
envsactivate1:31353494
0927b901:31350571
4gdec884:31348710
custommodel2t:31371781
45650338:31358607
0cj2b977:31352657
justeven_python:31371804
0574c672:31362109
pylancealldocst:31371774
cloudbuttont:31374192
retryenabled:31370050
3efgi100_wstrepl:31374188

[eleanorjboyd]

Hello! Are you using the python environments extension? This is our new extension for all things environments that has pixi support.
steps to enable:
install the python environments extension
set "usePythonEnvironments: true" in your user settings
install the pixi extension: https://marketplace.visualstudio.com/items?itemName=renan-r-santos.pixi-code

then it should work! If not issues can be filed here https://github.com/renan-r-santos/pixi-code

[Jaapel]

This extension is apparently installed!
I will crosspost it there.
renan-r-santos/pixi-code#13

[Jaapel]

For future reference, disabling this extension fixed my issues until the issue is fixed.

[github-actions]

Hey @eleanorjboyd, this issue might need further attention.

@Jaapel, you can help us out by closing this issue if the problem no longer exists, or adding more information.

[github-actions]

Because we have not heard back with the information we requested, we are closing this issue for now. If you are able to provide the info later on, then we will be happy to re-open this issue to pick up where we left off.

Happy Coding!