Constitutional governance means every AI agent operates inside an explicit, inspectable rule set — which skills it may use, which actions it may take, and what must happen before a change lands — enforced by the platform, not by prompt etiquette.
In Joyus, those rules are not a policy document beside the system; they are the system. The platform core enforces mediated access and workflow gates, Joyus Desktop applies policy on the operator's machine, and every step leaves a receipt you can inspect afterward. For regulated work — healthcare, education, legal — that audit trail is the difference between "we told the AI to behave" and "we can show you what it was allowed to do."
The enforcement surfaces are public: the governing specs ship in the open-core repository, so you can read the constitution rather than take our word for it.