Wénsù was a Southern Sòng Cáodòng 曹洞 attendant-monk (shìzhě 侍者) under Tiāntóng Rújìng 天童如淨 (1163–1228) during Rújìng’s abbacy at the Jiànkāng Qīngliáng chánsì 建康清涼禪寺 (from Jiādìng 3 = 1210). He is the named compiler of the Qīngliáng section of the Rújìng héshàng yǔlù (KR6q0071), forming the first major block of juan 1; the catalog meta accordingly names him as the nominal compiler of the whole work, though juan 2 and further sections of juan 1 were compiled by other attendants (Zǔrì 祖日, Yìyuǎn 義遠, Dézhān 德霑, Qīngmào 清茂, Déxiáng 德祥).
No independent biography or dates survive. No DILA authority entry: the figure here is distinct from 范質 / 范文素 (DILA A013062, a Northern Sòng statesman) and from 眉庵行秀 / 文素 (DILA A016167, a Míng–Qīng monk).