[BUG] /copy command reports success but clipboard is empty (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?

Expected: content available via Ctrl+V
Actual: clipboard empty, even though command prints "Copied to clipboard (N characters)"

What Should Happen?

Environment:

• OS: Windows 11
• Claude Code: [v2.1.187]
• Shell: PowerShell / Git Bash

Steps to reproduce:

1. Run any prompt in Claude Code
2. Run /copy

Expected: content available via Ctrl+V
Actual: clipboard empty, even though command prints "Copied to clipboard (N characters)"

Additional context:

• clip.exe works fine in terminal (echo test | clip)
• Workaround: file written to %TEMP%\claude\response.md works

Error Messages/Logs

Steps to Reproduce

Steps to reproduce:

1. Run any prompt in Claude Code
2. Run /copy

Claude Model

Sonnet (default)

Is this a regression?

I don't know

Last Working Version

v2.1.185

Claude Code Version

v2.1.187

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

IntelliJ IDEA terminal

Additional Information

_No response_