According to Kushiki-ryo (law on state documentary forms in the Yoro Code)(Ritsuryo), the emperor first passes on the contents of Choku to a jiju (a chamberlain) and then transmits to the Nakatsukasasho (Ministry of Central Affairs).
公式令(律令法)によれば、まず天皇が勅の内容を侍従などに伝えてそれを中務省に伝達する。