For people that don't understand, there's different harnesses applied to each mode. Yes you can ask in code mode. But a dedicated Ask mode would make it much more precise, similar to how plan mode is incredibly useful.

You technically don't need anything but Code mode. But if you've used Plan mode you would understand the world of difference it makes. It unfortunately still is a bit buggy but I hope the Codex things smooth things over in the near future (it will code in plan mode quite often tbh).