Input box remain dark after the system theme turn to light

[cynicalight]

What version of Codex CLI is running?

0.122.0

What subscription do you have?

plus

Which model were you using?

gpt-5.4

What platform is your computer?

Darwin 25.3.0 arm64 arm

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

Ghostty + Tmux

What issue are you seeing?

After the system switch to light theme in another day morning, the input box of the codex cli is still in dark mode(last night is in dark mode). I have to /exit codex and reopen it again, the input box turns to light theme.

What steps can reproduce the bug?

1. Switch to dark mode in mac, and open codex:

2. then switch to light mode, and you will see the input box stay dark:

What is the expected behavior?

No response

Additional information

No response

[github-actions]

Potential duplicates detected. Please review them and close your issue if it is a duplicate.

• invisible text when using light theme: dark text over dark textarea #16411

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[rushrs]

Proposed fix

I have a working branch with a narrow fix here:

• Branch: https://github.com/rushrs/codex/tree/rushrs/auto-theme-on-focus
• Commit: rushrs@95f9e52cd

The change does three things:

• add a helper to reselect the adaptive runtime theme from the current terminal palette
• call it after requery_default_colors() on FocusGained
• leave explicit user-configured tui.theme overrides untouched

It also adds a focused unit test for the FocusGained event path.

Why this hook

FocusGained is already where Codex refreshes its view of the terminal palette, so it is the least invasive place to update the adaptive theme as well. This keeps the work off the render hot path and only runs when the terminal returns focus.

User impact

• terminals that update their reported default colors after a system appearance switch can cause Codex to follow the new appearance without restarting
• users with an explicit tui.theme setting see no behavior change