Statusline not working on Windows - "Session environment not yet supported on Windows"

Preflight Checklist

• [x] I have searched existing issues and this hasn't been reported yet
• [x] This is a single bug report (please file separate reports for different bugs)
• [x] I am using the latest version of Claude Code

What's Wrong?

The custom statusline feature stopped working after a recent update. The statusline was working previously but now
does not appear at all. Investigation of the debug log revealed the following entry after each assistant message:

Session environment not yet supported on Windows

No invocation of the configured statusline command is logged at any point during the session, confirming the script is
never called.

Configuration (~/.claude/settings.json):
{
"statusLine": {
"type": "command",
"command": "powershell -NoProfile -File C:\\Users\\<user>\\.claude\\statusline.ps1"
}
}

Statusline.ps1:

$jsonInput = [Console]::In.ReadToEnd()
$jsonInput | Out-File -FilePath "$env:USERPROFILE\.claude\statusline_debug.log" -Encoding utf8 -Append
$data = $jsonInput | ConvertFrom-Json

$cwd = $data.workspace.current_dir
$model = $data.model.display_name
$used = $data.context_window.used_percentage

$dirName = Split-Path -Leaf $cwd
$status = "$dirName"

try {
$branch = git branch --show-current 2>$null
if ($branch) {
$status += " [$branch]"
}
} catch {}

$status += " | $model"

if ($null -ne $used) {
$rounded = [Math]::Round([double]$used, 1)
$status += " | Context: ${rounded}%"
} else {
$status += " | Context: 0%"
}

Write-Output $status

What Should Happen?

Statusline should appear in Windows Terminal when using Claude Code CLI

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

1. Configure a statusLine command in ~/.claude/settings.json on Windows
2. Start Claude Code
3. Send a message
4. Observe: no statusline appears at the bottom of the interface

Expected behavior: Statusline script is invoked after each assistant message and output is displayed at the bottom of
the Claude Code interface.

Actual behavior: Statusline script is never invoked. Debug log contains Session environment not yet supported on
Windows.

Additional notes:

• The script itself works correctly when invoked manually: echo '<json>' | powershell -NoProfile -File

~/.claude/statusline.ps1 produces the expected output

• The statusLine config is correctly read (the command is registered as an allowed Bash rule in the debug log), but

the command is never executed

• This appears to be a regression introduced with the native Windows binary — the statusline worked in a previous

version

Claude Model

Sonnet (default)

Is this a regression?

Yes, this worked in a previous version

Last Working Version

a few days ago it worked

Claude Code Version

2.1.49 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Windows Terminal

Additional Information

Additional notes:

• The script itself works correctly when invoked manually: echo '<json>' | powershell -NoProfile -File

~/.claude/statusline.ps1 produces the expected output

• The statusLine config is correctly read (the command is registered as an allowed Bash rule in the debug log), but

the command is never executed

• This appears to be a regression introduced with the native Windows binary — the statusline worked in a previous

version