Magouemon no Jo Kiyomitsu was a swordsmith of the group active during the final decades of the period, with dated works spanning from the Eiroku era through Genki 2 (1571). Together with Gorouemon no Jo Kiyomitsu, he is distinguished as a smith of especially high technical ability among the many makers who bore the Kiyomitsu name in this era. Both smiths are noted for excelling in the forging of , though Magouemon no Jo also produced accomplished work in .
His forging characteristically displays tightly packed with well-adhering and, on occasion, . The in his principal mode is a broad with slight or mixed in, featuring abundant and entering frequently; the tends toward tightness with adhering. In this manner, his is described as "exceptionally fine." His secondary mode -- a with waist-opened forming a compound structure -- displays and characteristics resembling the work of Yosauemon no Jo Sukesada. In the , the temper typically turns with a pointed tendency, continuing at times into . Around the , and incipient may appear. His blades commonly exhibit the late-period form with , wide , and , reflecting the very final phase of the period.
Magouemon no Jo Kiyomitsu ranks not merely as a representative Kiyomitsu smith but among the more accomplished makers of works as a whole. His finest blades are praised in terms that transcend the individual -- "not merely a masterwork by Kiyomitsu, but furthermore a typical and representative example among works of the group in this period." Multiple designated blades bear inscriptions recording prestigious commissions, including one forged for the deputy military governor Uragami Munekage and intended for transmission to his descendants. The consistently fine quality of both and across his output, together with the sound preservation of the blades, attests to a craftsman whose workmanship was excellent and whose dated inscriptions provide valuable documentary material for the study of late production.