`python.analysis.restartLanguageServer` not found

[DanielNoord]

Type: Bug

Behaviour

When not using Pylance when I open a Python file the "Python: Restart Language Server" gets added to the command palette, but it can't find the actual command when running.

Steps to reproduce:

1. Install Pylance
2. Install Pyrefly
3. Use Pyrefly as language server
4. Open Python file
5. Run "Python: Restart Language Server" command

Diagnostic data

There are no logs from the Python Output panel when this happens.

By the way, I'm quite surprised by the languageServer: "None" in the diagnostics. pyrefly works fine as a LSP. Is the Python extension not picking it up correctly?

Extension version: 2025.18.0
VS Code version: Code 1.106.3 (bf9252a2fb45be6893dd8870c0bf37e2e1766d61, 2025-11-25T22:28:18.024Z)
OS version: Linux x64 6.8.0-88-generic
Modes:

• Python version (& distribution if applicable, e.g. Anaconda): 3.13.3
• Type of virtual environment used (e.g. conda, venv, virtualenv, etc.): Venv
• Value of the python.languageServer setting: Default

User Settings

languageServer: "None"

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

Installed Extensions

Extension Name	Extension Id	Version
code-spell-checker	str	4.3.2
copilot	Git	1.388.0
copilot-chat	Git	0.33.3
debugpy	ms-	2025.16.0
even-better-toml	tam	0.21.2
gitlens	eam	17.7.1
haskell	has	2.6.1
js-debug	ms-	1.105.0
js-debug-companion	ms-	1.1.3
jupyter	ms-	2025.9.1
jupyter-renderers	ms-	1.3.0
language-haskell	jus	3.6.0
Nix	bbe	1.0.1
prettier-vscode	esb	11.0.0
pyrefly	met	0.43.1
python	ms-	2025.18.0
remote-repositories	ms-	0.42.0
remotehub	Git	0.64.0
ruff	cha	2025.30.0
rust-analyzer	rus	0.3.2693
separators	ale	2.9.0
todo-tree	Gru	0.0.226
vim	vsc	1.32.1
vscode-js-profile-table	ms-	1.0.10
vscode-jupyter-cell-tags	ms-	0.1.9
vscode-peacock	joh	4.2.2
vscode-pgsql	ms-	1.12.0
vscode-pull-request-github	Git	0.122.1
vscode-pylance	ms-	2025.10.2
vscode-python-envs	ms-	1.12.0
vscode-yaml	red	1.19.1

System Info

Item	Value
CPUs	11th Gen Intel(R) Core(TM) i7-11800H @ 2.30GHz (16 x 4200)
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: disabled_off trees_in_viz: disabled_off video_decode: enabled video_encode: disabled_software vulkan: disabled_off webgl: enabled webgl2: enabled webgpu: disabled_off webnn: disabled_off
Load (avg)	4, 3, 3
Memory (System)	62.52GB (45.70GB free)
Process Argv	--crash-reporter-id fa5dd309-3151-499e-bb0b-0253b167ef54
Screen Reader	no
VM	0%
DESKTOP_SESSION	ubuntu
XDG_CURRENT_DESKTOP	Unity
XDG_SESSION_DESKTOP	ubuntu
XDG_SESSION_TYPE	wayland

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vsliv368cf:30146710
pythonvspyt551cf:31249601
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
aj953862:31281341
nes-set-on:31351930
6abeh943:31336334
0574c672:31404437
cloudbuttont:31379625
todos-1:31405332
qwen_all_req:31402696
control_gpt5applypatchexclusively:31412085
42190218_ostrepl:31403339
trigger-command-fix:31379601
auto_model_enabled:31385282
use-responses-api:31390855
auto_g2946222:31414244
6j29d282:31407606
2a0ce269:31419925
ec5jj548:31422691
copilot-nes-oct-t:31418199
cmp-ext-control:31426504
cp_cls_c_966_ss:31426491
defaultvisibility:31426295
expandedtokens:31426297
c0683394:31419495
3fia6346:31426581
ge8j1254_inline_auto_hint_haiku:31426636
nes-autoexp-20:31426650

[anthonykim1]

@karthiknadig Did Python extension officially support Pyrefly?