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&gt; should I be able to request `ClocBinary` (or any other class representing a binary tool) as a subject of an `@rule`?
yes, with an `optionable_rule`, because it is a `Subsystem`

I don't 100% understand how `optionable_rule`s work

it seems like, from files like `create_requirements_pex.py`, that if I want to use a subclass of `Subsystem` as a rule input

I need to have `optionable_rule(Subsystem)` in the `rules()` output of my module?

`optionable_rule` creates a `@rule` that constructs an `Optionable` (which is a super class of `Subsystem`)