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

Environment

• Platform (select one):
• [ ] Anthropic API
• Claude CLI version: 1.0.73
• Operating System: macOS 26.0
• Terminal: vscode

Bug Description

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.

Steps to Reproduce

1. Run /add-dir to add a new directory.
2. Use @ to open the file mention list.
3. Notice that files from the newly added directory are missing.

Expected Behavior

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