Agents session from windows to linux wrong file path separator

Type: Bug

Running the agents interface from a windows box to a remote session through ssh to a linux server, the agent left comments on a file but they can't be seen because the route isn't found, looks like it's constructed with windows style backslashes.

VS Code version: Code 1.134.0 (110a328ea54b42367b803ec53ee0bf52ef26b419, 2026-08-18T18:24:44Z)
OS version: Windows_NT x64 10.0.26100
Modes:
Remote OS version: Linux x64 5.15.0-1114-azure

System Info

|Item|Value|
|---|---|
|CPUs|12th Gen Intel(R) Core(TM) i5-1245U (12 x 2496)|
|GPU Status|2d_canvas: enabled
GPU0: VENDOR= 0x8086, DEVICE=0x4628 [Intel(R) UHD Graphics], DRIVER_VENDOR=Intel, DRIVER_VERSION=32.0.101.7085 *ACTIVE*
GPU1: VENDOR= 0x1414, DEVICE=0x008c [Microsoft Basic Render Driver], DRIVER_VERSION=10.0.26100.8875
Machine model name:
Machine model version:
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: enabled
webgl: enabled
webgpu: enabled
webnn: disabled_off|
|Load (avg)|undefined|
|Memory (System)|15.65GB (1.55GB free)|
|Process Argv|--crash-reporter-id e9d7ca56-6f01-4361-a0a4-2c6f663ff98f|
|Screen Reader|no|
|VM|0%|

|Item|Value|
|---|---|
|Remote|SSH: aks2|
|OS|Linux x64 5.15.0-1114-azure|
|CPUs|AMD EPYC 9V74 80-Core Processor (8 x 0)|
|Memory (System)|62.79GB (28.06GB free)|
|VM|0%|
Extensions (26)

Name|Identifier|Author|Version
---|---|---|---
Ruff|charliermarsh.ruff|charliermarsh|2026.72.0
Prettier - Code formatter|esbenp.prettier-vscode|esbenp|12.4.0
shell-format|foxundermoon.shell-format|foxundermoon|7.2.8
DotENV|mikestead.dotenv|mikestead|1.0.1
gettext|mrorz.language-gettext|mrorz|0.5.0
Azure Pipelines|ms-azure-devops.azure-pipelines|ms-azure-devops|1.261.1
Black Formatter|ms-python.black-formatter|ms-python|2026.6.0
Python Debugger|ms-python.debugpy|ms-python|2026.6.0
Python|ms-python.python|ms-python|2026.4.0
Pylance|ms-python.vscode-pylance|ms-python|2026.3.1
Python Environments|ms-python.vscode-python-envs|ms-python|1.36.0
Jupyter|ms-toolsai.jupyter|ms-toolsai|2025.9.1
Jupyter Notebook Renderers|ms-toolsai.jupyter-renderers|ms-toolsai|1.3.0
Jupyter Cell Tags|ms-toolsai.vscode-jupyter-cell-tags|ms-toolsai|0.1.9
Jupyter Slide Show|ms-toolsai.vscode-jupyter-slideshow|ms-toolsai|0.1.6
Remote - SSH|ms-vscode-remote.remote-ssh|ms-vscode-remote|0.124.0
Remote - SSH: Editing Configuration Files|ms-vscode-remote.remote-ssh-edit|ms-vscode-remote|0.87.0
WSL|ms-vscode-remote.remote-wsl|ms-vscode-remote|0.104.3
Remote Explorer|ms-vscode.remote-explorer|ms-vscode|0.5.0
SFTP|natizyskunk.sftp|Natizyskunk|1.16.3
YAML|redhat.vscode-yaml|redhat|1.24.0
CSV|repreng.csv|ReprEng|1.3.0
Even Better TOML|tamasfe.even-better-toml|tamasfe|0.21.2
Ayu|teabyii.ayu|teabyii|1.1.12
ShellCheck|timonwong.shellcheck|timonwong|0.39.5
Markdown All in One|yzhang.markdown-all-in-one|yzhang|3.6.3

A/B Experiments

```
vsliv368:30146709
vswsl492cf:30256860
binariesv615:30325510
nativeloc1:31344060
dwcopilot:31170013
dwoutputs:31242946
copilot_t_ci:31333650
e5gg6876:31282496
pythonrdcb7:31342333
6518g693:31463988
aj953862:31281341
envsactivate1:31551504
cloudbuttont:31379625
3efgi100_wstrepl:31403338
56b7f661:31457055
ec5jj548:31422691
cp_cls_t_966_ss:31526232
4je02754:31466945
c3h7c220:31478652
ge8j1254_inline_auto_hint_haiku:31490510
cp_cls_c_1081:31454833
conptydll_true:31498968
e9c30283:31461165
test_treatment2:31471001
46204921:31447328
capico_a_098a3278:31555650
ei9d7968:31496641
nes-extended-on:31455476
chat:31457767
8hig5102:31480529
89g7j272:31518289
i2gc6536:31499202
52612955:31516516
ghj88844:31499326
ddid_t:31478206
hmra_i5g22:31518061
7df3h592:31512476
cp_cls_t_1082:31535311
logging_enabled_new:31498466
j0d79568:31499440
jb_cp_cls_t_632:31543129
56dj4588:31512888
32d76977:31512328
ha629193:31508444
a1ije391_t:31540920
jbcp_cls_pctr_t:31531130
61138546:31518536
cp_intellij_t_nes:31548657
jf4hg949:31526829
ahp-both-windows:31556933
sessions_3:31532893
ihg5j128:31534457
f412h606:31551416
7g2b5551:31542111
enable_editor_pane_layout:31567814
allow-none:31555437
6i51c363:31551401
36h42362:31564511
c7c27ce7:31554789
1h923230:31564177
0dg73464:31554319
treatment-23-1:31555779
unuse_dynamic_mcp:31555281
0d8dfbc3:31566037
switchtoauto:31559321
0c1h4866:31566224
vrbsty_tr:31561058
session-archive:31558132
5b8j3302:31564601
permission_prompt_control:1332567
ccr_pr_nudge_auto_review:1319472

```

Start by reproducing the agents interface from a Windows client against a Linux SSH remote session, using the reported VS Code and Remote - SSH versions. Trace how the agent comment file route is constructed; done means comments left on remote Linux files are visible and the route resolves without Windows-style separators.

Written by the indexing model from the issue text.