The tradition owes its coherence to an editor. Tao Hongjing, who lived from 456 to 536, spent years collecting the scattered Yang Xi manuscripts, distinguishing the genuine from the forged, and arranging them with commentary in the Zhen'gao, the Declarations of the Perfected. He moved to Mount Mao, Maoshan, in 492, established the temple there with imperial support, and made it the tradition's seat. His work is one of the more remarkable exercises in textual criticism in the pre-modern world: he was authenticating handwriting from more than a century earlier, and he set out his criteria for doing it.
Shangqing was the dominant Taoist tradition of the Tang and the court patronised it. It declined under the Northern Song, and under the Yuan it was absorbed, with the other liturgical schools, into the Zhengyi alliance of 1304.
There is no independent Shangqing organisation today. Maoshan remains a Taoist centre and a place of pilgrimage, and a Maoshan tradition of ritual and magic continues there and in southern China and Southeast Asia, but it differs substantially from what the Yang Xi revelations described, and treating the two as the same thing would be an error.
What Shangqing left is not an institution but a repertoire. Its texts entered the Taoist canon; its techniques of interior visualisation shaped the internal alchemy that Quanzhen made central four centuries later; and the vocabulary of body-gods, inner landscapes and celestial ascent that runs through later Taoist self-cultivation is substantially its vocabulary. A tradition can disappear as an organisation and survive as a method, and this is the clearest Taoist instance of it.