Today, we have posted our flagship paper on the AGORA galaxy formation simulation comparison project. I’m extremely happy to be a part of this collaboration to further understand the differences between astrophysical simulation codes. This paper outlines the philosophy behind the project and serves as a platform for independent scientific projects, which we have covered in this paper in the Appendix. This is just the start of the papers that will come out of this project, which we will discuss in an upcoming AGORA workshop next week in Santa Cruz.