Codex v0.140.0: @ unified mentions menu opens but cannot navigate or select items with arrow keys

What version of Codex CLI is running?

v0.140.0

What subscription do you have?

yping @ opens the new unified mentions menu for files, plugins, and skills, but the list cannot be navigated with Up/Down arrow keys and items cannot be selected reliably.

Which model were you using?

_No response_

What platform is your computer?

macOS

What terminal emulator and version are you using (if applicable)?

warp dev v0.2026.06.10.09.27.stable_01

Codex doctor report

codex doctor --json
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What issue are you seeing?

Version:
Codex CLI v0.140.0

Platform:
macOS

Issue:
Typing @ opens the new unified mentions menu for files, plugins, and skills, but the list cannot be navigated with Up/Down arrow keys and items cannot be selected reliably.

Steps to reproduce:

1. Start Codex CLI v0.140.0.
2. In the composer, type @.
3. Observe that the unified mentions menu opens and displays files/plugins/skills.
4. Press Up/Down arrow keys.
5. Try to select an item with Enter.

Expected:
The Up/Down arrow keys should move the active selection in the mentions menu, and Enter should insert/select the highlighted item.

Actual:
The mentions menu opens, but keyboard navigation does not work. The user cannot select a candidate from the menu.

Impact:
This blocks the main keyboard workflow for referencing files/plugins/skills from the composer. I

What steps can reproduce the bug?

Version:
Codex CLI v0.140.0

Platform:
macOS

Issue:
Typing @ opens the new unified mentions menu for files, plugins, and skills, but the list cannot be navigated with Up/Down arrow keys and items cannot be selected reliably.

Steps to reproduce:

1. Start Codex CLI v0.140.0.
2. In the composer, type @.
3. Observe that the unified mentions menu opens and displays files/plugins/skills.
4. Press Up/Down arrow keys.
5. Try to select an item with Enter.

Expected:
The Up/Down arrow keys should move the active selection in the mentions menu, and Enter should insert/select the highlighted item.

Actual:
The mentions menu opens, but keyboard navigation does not work. The user cannot select a candidate from the menu.

Impact:
This blocks the main keyboard workflow for referencing files/plugins/skills from the composer. I

What is the expected behavior?

The Up/Down arrow keys should move the active selection in the mentions menu, and Enter should insert/select the highlighted item.

Additional information

Workaround / Additional confirmation:

After running:

codex features disable mentions_v2

and restarting Codex, the @ file mention menu works normally again. I can navigate the file list with the Up/Down arrow keys and select files as expected.

This suggests the issue is specific to the new mentions_v2 / unified mentions menu introduced in v0.140.0, rather than a terminal or keyboard environment problem.

Another Workaround / Additional confirmation:
After switching to ghostty or iTerm, both work fine — I can use @ and the arrow keys to navigate and choose the file or directory I want.

_No response_