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PowerShell shell output is mojibake on Windows unless UTF-8 OutputEncoding is set #31345
Description
Description
### Describe the bug
On Windows, shell tool output from PowerShell can render Chinese text as mojibake when the command does not explicitly set UTF-8 output encoding.
Possible cause.Opencode appears to decode shell stdout as UTF-8, but PowerShell on Windows may emit output using the active console code page unless [Console]::OutputEncoding is set to UTF-8. This causes non-ASCII output to be decoded incorrectly.
A possible fix is to wrap PowerShell shell commands with:
[Console]::OutputEncoding = [System.Text.UTF8Encoding]::new($false)
$OutputEncoding = [Console]::OutputEncoding
Plugins
None
OpenCode version
v1.16.2
Steps to reproduce
just input opencode prompts below
use pwsh exec command: Write-Output "测试中文输出"
You can observe Chinese text as mojibake
Screenshot and/or share link
No response
Operating System
Windows 11
Terminal
PowerShell / pwsh
Reacted by wwjCMP
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github-actions commentedon Jun 8, 2026
This issue might be a duplicate of existing issues. Please check:
Please review these issues to see if your report is already covered. If it is, consider adding any new information there instead.
qinant commentedon Jun 8, 2026
Its same as #23636 #31187 #30205