I don't know I've ever known the id of a workspace a priori, and it's required for EVERY API. In almost every case, I just know the name of the workspace and end up having to write a direct call to the /auth route and figure it out myself. I'd like to add this functionality to this set of clients.
I haven't dug too deeply yet, so I'm not sure where it would be the best fit, but I'm happy for suggestions if someone has an immediate, strong preference.