[BUG] VSCode Extension: "Insert @-Mention Reference" and "Insert At-Mentioned" keyboard shortcuts not working on Windows (v2.1.7)

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 keyboard shortcuts for "Claude Code: Insert @-Mention Reference" (Alt+K) and "Claude Code: Insert At-Mentioned" (Ctrl+Alt+K) are not working in the VSCode extension on Windows.

When pressing Alt+K or Ctrl+Alt+K with text selected in the editor, nothing happens. The commands appear in the Command Palette and can be executed manually, but the keyboard shortcuts do not trigger them.

After investigating keybindings.json, I found:

1. alt+k binding for claude-vscode.insertAtMention is disabled (has - prefix)
2. ctrl+alt+k binding for claude-code.insertAtMentioned has conflicting entries (both active and disabled)
3. VSCode's keybindings.editor.recordSearchKeys is intercepting alt+k

These shortcuts worked correctly until January 13, 2026 but stopped after the extension update.

What Should Happen?

• Custom keybindings should persist and work correctly after extension updates
• Pressing my custom Alt+K with text selected should insert an @-mention reference with the file path and line numbers directly into the chat prompt
• Pressing my custom Ctrl+Alt+K with text selected should insert the selected code reference into the Claude terminal

Both custom shortcuts should work without being overridden or disabled by extension updates.

Error Messages/Logs

Steps to Reproduce

• Custom keybindings should persist and work correctly after extension updates
• Pressing my custom Alt+K with text selected should insert an @-mention reference with the file path and line numbers directly into the chat prompt
• Pressing my custom Ctrl+Alt+K with text selected should insert the selected code reference into the Claude terminal

Both custom shortcuts should work without being overridden or disabled by extension updates.

Claude Model

None

Is this a regression?

Yes, this worked in a previous version

Last Working Version

_No response_

Claude Code Version

2.1.4

Platform

Anthropic API

Operating System

Windows

Terminal/Shell

Other

Additional Information

_No response_