Kaneyuki was admired as having the best penmanship at the time, so he was in charge of making a clean copy of Iki (the document given to a person when a rank was conferred on him) and Johyobun (the petition to the Emperor), and also in charge of writing Ganmon (the Imperial prayer document for a blessing) and the letters on Shikishigata (the colored, square-shaped paper inscribed with verses) and the letters in the frame held at the gate, etc.
当時第一の手書きと称され、位記（位を授ける際に与える文書）や上表文の清書、願文（祈願の意を表す文書）の執筆、色紙形や門に掲げる額の揮毫などを担当した。