The most important part of the relationship between you and your link builder might not be what you think.
You want them to follow Google’s guidelines (or you might not care) and build great links.
You want their work to give you more traffic and better rankings.
You may be fine with certain risky tactics, or you may only be building links because your competitors are, and you feel the need to keep up.
You may think you want a lot of things, but what you really need is transparency.