There is tooling to generate both the client and server side code, as well as the API docs.
I know there is other tooling to help with mocking, validation, etc, but not centrally available, generated by 3rd parties.
That is one area that Swagger suffers from is the fragmentation of tooling, although it has a headstart over RAML and Blueprint, this area hurts it.
I've been trying to account for more of their tooling to identify the pieces of the lifecycle puzzle, but haven't gotten there.
Let me do some more homework this week on it, and wiill post anything I find.