[BUG] "Copy message" copies empty string to clipboard on Windows 11 Desktop App

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 "Copy message" function in the Desktop App copies an empty string to the clipboard instead of the message content. Neither Ctrl+C nor Ctrl+Shift+C work either. As a result, it is impossible to copy any text from Claude's responses.

What Should Happen?

Selecting text from a Claude response and using "Copy message" (right-click context menu) or standard keyboard shortcuts (Ctrl+C / Ctrl+Shift+C) should copy the selected text to the clipboard so it can be pasted in another application.

Error Messages/Logs

No error message or visual feedback is shown. The only observable symptom is that pasting after copying produces an empty string, replacing any previously selected text in the target application with nothing.

Steps to Reproduce

1. Open Claude Code Desktop App on Windows 11
2. Start a conversation and receive a response from Claude
3. Select any portion of Claude's response using the mouse (text highlights correctly)
4. Right-click → "Copy message"
5. Open Notepad, press Ctrl+V
6. The pasted content is empty

Claude Model

Not sure / Multiple models

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.85 (Claude Code)

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

• OS: Windows 11
• Text selection works correctly (mouse drag highlights text as expected)
• The right-click context menu appears and "Copy message" is clickable, but has no effect on clipboard content
• Ctrl+C and Ctrl+Shift+C also fail to copy selected text
• Workaround: using claude.ai/code in a browser works correctly