In addition, the officers stayed in the sotetsu (cycad) room in the Edo castle as the Oshirozukai officers to grasp movements of the cabinet officials of the Shogunate, to obtain and interpret various laws and regulations presented by the bakufu and to compose documents to be submitted to the bakufu.
そのほか、藩主が江戸在府中であっても御城使として江戸城中蘇鉄の間に詰め、幕閣の動静把握、幕府から示される様々な法令の入手や解釈、幕府に提出する上書の作成、を行っていた。