[BUG] @ mentions don’t show files from directories added via /add-dir

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?

When adding a new directory using the /add-dir command in Claude Code, files under that newly added directory are not shown in the file list when using @ mentions.

What Should Happen?

Files from newly added /add-dir paths should appear immediately in the @ mention list without requiring a restart or manual refresh.

Error Messages/Logs

Steps to Reproduce

1. Open Claude Code in the terminal (vscode).
2. Run the command:

 /add-dir <path-to-new-directory>

to add a new directory.

1. In the editor, type @ to trigger the file mention list.
2. Observe the list of files shown.

Files inside the newly added directory do not appear in the @ mention list.

Claude Model

Sonnet (default)

Is this a regression?

No, this never worked

Last Working Version

_No response_

Claude Code Version

1.0.124

Platform

Anthropic API

Operating System

macOS

Terminal/Shell

VS Code integrated terminal

Additional Information

_No response_