The controller cannot know the operator's account's uid, names an access by its
declared id (which holds a slash), and should not parse words. A tool runner's
account may now come by name alone and is read here (refused when absent or root's,
its uid said in the access's listing); the take act matches the declared id exactly;
an access wait says its reason (keep or disk) and, for a filesystem that refuses
ACLs, whether the take act can enable them.