.

Lit., 'standard of proceeding' (the gerund of 'agere' clearly being employed here as a legal technical term which = '(legal) procedure'; cf. such phrases as 'causam agere', 'iure agere', 'lege agere', etc.).

I believe that this would be the closest translation using American legal terminology. I'm not certain how aptly it would apply outside of the USA. But here it essentially means that citizens cannot be subjected to irregular enforcement of the laws, and that the laws must conform with constitutionally and/or internationally accepted legal principles, e.g., that a defendant has the right to confront his accuser, or that a spouse is not obligated to testify against the other spouse.

Subjective right
Subjective right (facultas agendi) indicates the ability attributed to a person's desire to act on satisfying their own interests (ability recognised and guaranteed by the objective right). The objective right (also called norma agendi) is the set of regulations set apart for conduct that discipline a community, a society, etc. An example in more precise terms is: the subjective right is the situation for which a disabled person who did not receive what the law foresees for them can appeal to the Ordinary Judge to achieve recognition of this right.

Disability

ius
norma agendi >> objective right: the rule of action.
facultas agendi >> subjective right: the right to act.

"The different meanings of the word "ius" were for a long time familiar to the lawyers who had been brought up in the study of the Roman law. They had carefully distinguished between "objective" and "subjective right", between the **norma agendi** (the rule of action) and the facultas agendi (the right to act) which can both be indicated by the same name of "ius". But they had never overlooked the fact, which Hobbes seems either to ignore or to implicitly deny, that the two meanings of "ius" are not antithetical, but correlative. In the language of the law-schools and as we have seen of St Thomas, ius could be used in an "objective" as well as in a "subjective" sense: but the latter always presupposes the former. There is a facultas agendi inasmuch as there is a norma agendi. There is a "right" inasmuch as there is a law".
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Have a nice day!