If I have an opportunity and add an agreement from within the opportunity, and the agreement is accepted, there is no way to open the actual project from within the opportunity. This assumes that when the agreement is signed, it auto creates the project.

There isn't a quick way to access the project from within the opportunity. Or access the opportunity from within the project. If there is a link between the opportunity and project it would be nice to be able to access either or without needing to click 2-4 additional times