The prescribed number of personnel for this post was three during the Heian period and in addition to the receipts and disbursements jobs for Kurododokoro, Suino also drafted the documents of Kurododokoro, such as cho (official certificate), kudashibumi (document issued by a superior or office) and hensho (letter of receipts), and signed these documents together with Kurodo (Chamberlain).
平安時代には定員3名で蔵人所における出納業務を行ったほか、蔵人所が出す牒・下文・返抄などの文書を蔵人に代わって起草・作成して蔵人とともに連署した。