Setting Up a Macropad for Codex CLI on macOS

For Codex CLI, Left-Hand Pad supplies twelve physical keys and two rotary knobs on macOS. It can send ordinary keyboard events to a terminal running Codex CLI, giving repetitive navigation its own physical controls.

Which Codex CLI prompts come up often enough to earn a key?

Begin with the stable terminal actions around Codex, not a memorised list of approval letters. Escape, return, tab, arrow keys, an interrupt shortcut and terminal search are easy to recognise and easy to reverse. Codex shows approval requests in context, and the available choices can depend on the action and current permissions. Read that context before responding.

Leave changes to permission modes, broad access and destructive shell commands on your normal keyboard. A dedicated key reduces friction, but it also reduces the pause in which you notice that the request is different from the last one.

How do you map the keys on macOS?

Use a keyboard event viewer to identify the code from each pad position. In Karabiner-Elements, simple modifications can turn one code into another. Complex rules can limit a mapping to the pad itself or to your terminal application. Device-specific conditions prevent the same physical key on your main keyboard from changing.

Test the output in a blank text document before opening Codex. Then test inside a shell with no important command on the line. Add one control, use it for a session, and only then add the next. This takes longer than importing a large preset, but it tells you which layer produced a mistake.

Can a knob scroll Codex output?

Possibly, if the knob reports key events that your terminal can map to scrolling. Observe clockwise, counter-clockwise and press separately. Map rotation to a small reversible action. Do not attach a shell command to every detent. Fast rotation can repeat an event many times.

Terminal scrollback and command-history movement are different. Pick one behaviour and label it. If the knob event is not exposed as a keyboard input, a keyboard remapper alone cannot use it.

What should you not bind to hardware?

Do not bind unrestricted permission changes, deletion commands, credential pastes or an automatic approval sequence. Also avoid a macro that assumes one Codex screen will always offer the same choices. Software updates and configuration changes can invalidate that assumption.

A safe layout stays intentionally incomplete. The Left-Hand Pad has enough positions to grow with your workflow, but the useful setup is the one you can explain without looking at a cheat sheet. Write the map down and review it after several real sessions.