Skills fail to load on Windows due to Expand-Archive using PowerShell 5.1 instead of configured pwsh shell

[turkeryildirim]

Description

Even with "shell": "pwsh" configured, skill loading uses Windows PowerShell 5.1's Expand-Archive, which fails with CouldNotAutoloadMatchingModule. Skill files already exist on disk at ~/.opencode/skills/kotlin/ so the ZIP extraction step should be skipped or should respect the shell config.

power shell 7.6.2 is installed.

`→ Skill "kotlin"
Expand-Archive : The 'Expand-Archive' command was found in the module 'Microsoft.PowerShell.Archive', but the module could not be loaded. For more information, run 'Import-Module Microsoft.PowerShell.Archive'.
At line:1 char:50

• ... lobal:ProgressPreference = 'SilentlyContinue'; Expand-Archive -Litera ...

•                                                ~~~~~~~~~~~~~~
  

  • CategoryInfo : ObjectNotFound: (Expand-Archive:String) [], CommandNotFoundException
  • FullyQualifiedErrorId : CouldNotAutoloadMatchingModule`

Plugins

No response

OpenCode version

1.15.12

Steps to reproduce

unzip below file to ~/.opencode/skills
kotlin.zip

Screenshot and/or share link

No response

Operating System

windows 11

Terminal

powershell 7.6.2

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• Bug: Expand-Archive module auto-load fails when spawned from opencode.exe (Bun) #24291: Same Expand-Archive module auto-load failure when spawned from opencode.exe (Bun) on Windows, with identical error message
• Expand-Archive error on Windows PowerShell when loading skills in v1.14.18 #23457: Same Expand-Archive error on Windows PowerShell when loading skills
• Windows skill loading fails when PowerShell archive module cannot load #24489: Same Windows skill loading failure when PowerShell archive module cannot load

If your issue is distinct (e.g. the skills ZIP already exists and extraction should be skipped entirely), please clarify that in your report.

[turkeryildirim]

additional test: blank project with simple readme.md file. i gave one simple prompt : "read the readme file" no extra skills/agents are registered.

error:
✱ Glob "README*"
Expand-Archive : The 'Expand-Archive' command was found in the module 'Microsoft.PowerShell.Archive', but the module co
uld not be loaded. For more information, run 'Import-Module Microsoft.PowerShell.Archive'.
At line:1 char:50

• ... lobal:ProgressPreference = 'SilentlyContinue'; Expand-Archive -Litera ...

•                                                ~~~~~~~~~~~~~~
  

  • CategoryInfo : ObjectNotFound: (Expand-Archive:String) [], CommandNotFoundException
  • FullyQualifiedErrorId : CouldNotAutoloadMatchingModule