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

[binbjz]

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

[MakenRosa]

A focused place to look: on current main, the mentions_v2 popup path does already route navigation/selection keys through ChatComposer::handle_key_event_with_mentions_v2_popup:

• ActivePopup::MentionV2(_) dispatches into that handler from handle_key_event.
• The handler maps Up / Ctrl-P to popup.move_up(), Down / Ctrl-N to popup.move_down(), and Tab / Enter to popup.selected().
• mentions_v2::popup::Popup keeps the selected row in ScrollState, and set_query / set_candidates call clamp_selection() rather than obviously resetting selection on every render.

So if this is reproducible in v0.140.0, I think the useful next split is:

1. Do Ctrl-N / Ctrl-P move the highlighted row while arrow keys do not? If yes, this is likely terminal key decoding / Warp-specific input rather than the popup selection model.
2. Does Tab insert the selected item when Enter does not? If yes, selection is probably valid and the failure is specific to the Enter/submit interaction.
3. Does the same repro happen outside Warp, or with a plain TERM=xterm-256color shell?

One small test gap I noticed: the current snapshots cover rendering of the unified mention popup/footer, but I did not find an obvious regression test that drives @..., Down, then Enter/Tab against ActivePopup::MentionV2. Adding that would make this easier to pin down and would distinguish “keys are not delivered” from “popup state is not preserved.”

[nekowasabi]

Same.