May I say, look at SpyREST (SpyREST.com) if you consider developing the API first and then produce the documentation automatically simply by exercising the API?

May I say, look at SpyREST (SpyREST.com) if you consider developing the API first and then produce the documentation automatically simply by exercising the API? This is an open-source tool, feel free to take a look. I'm developing SpyREST and will be happy to discuss if you want to learn more.