Lets talk about cats-effect, in a very specific perspective: we will go through the work done to migrate the rho DSL from being tied to fs2.Task, to being effect agnostic with cats-effect. Rho is a library that adds the capacity to generate swagger definitions to the http4s library, and since http4s has already been ported to cats-effect, the same was required for rho, which makes it a perfect case study for us. Cats-effect gives you the freedom to choose which effect implementation you actually want, be it cats-effect’s own IO, monix Task, scalaz Task or something else.