Regarding Muneyasu, the prevailing scholarly view holds that "Muneyasu" represents the earliest signature, or shomei, of the second-generation Iyo no Jo Munetsugu. This interpretation is corroborated by an extant naming document recording that the domain lord Nabeshima Katsushige bestowed the name "Muneyasu" on the ninth day of the ninth month of 'ei 9 (1632). Earlier sword references such as the Ben'gi, the Ichiran, and the Kokon Kaji Biko treated Muneyasu as a disciple of the first-generation Iyo no Jo, yet the manner of his inscription and related features clearly display the distinctive characteristics of the Munetsugu line.
Muneyasu's forging presents tightly packed mixed with , with fine adhering thickly and entering abundantly, producing an impression of excellent-quality steel. His is characteristically -based, mixing , -like forms, and pointed elements in a varied ; the is deep and bright, softened by thick , and -like appear at the , lending an archaic flavor. The work reveals a --flavored style that aims at , following the precedent of the first-generation Munetsugu who customarily took old works as a model and made conspicuous within his varied . The soft, luminous brightness of the and the unforced, natural character of the temper activities evoke a taste reminiscent of older works.
Extant examples bearing the Muneyasu signature are relatively few, lending each surviving piece high documentary value as material for the study of inscriptional forms and the relationship between Muneyasu and the second-generation Iyo no Jo Munetsugu. The works are praised both for their spirited, vigorous character and for their contribution to research on the Munetsugu line of smiths, a distinctive group within the tradition.