  We revisit the computation of string worldsheet correlators on Euclidean
$\text{AdS}_3$ with pure NS-NS background. We compute correlation functions
with insertions of spectrally flowed operators. We explicitly solve all the
known constraints of the model and for the first time conjecture a closed
formula for three-point functions with arbitrary amount of spectral flow. We
explain the relation of our results with previous computations in the
literature and derive the fusion rules of the model. This paper is the first in
a series with several installments.
