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We present a suite of high-resolution cosmological zoom-in simulations to$z=4$ of a $10^{12}\,{\rm M}_{\odot}$ halo at $z=0$, obtained using sevencontemporary astrophysical simulation codes widely used in the numerical galaxyformation community. Physics prescriptions for gas cooling, heating, and starformation, are similar to the ones used in our previous {\it AGORA} diskcomparison but now account for the effects of cosmological processes. In thiswork, we introduce the most careful comparison yet of galaxy formationsimulations run by different code groups, together with a series of fourcalibration steps each of which is designed to reduce the number of tunablesimulation parameters adopted in the final run. After all the participatingcode groups successfully completed the calibration steps, we reach a suite ofcosmological simulations with similar mass assembly histories down to $z=4$.With numerical accuracy that resolves the internal structure of a target halo,we find that the codes overall agree well with one another in e.g., gas andstellar properties, but also show differences in e.g., circumgalactic mediumproperties. We argue that, if adequately tested in accordance with our proposedcalibration steps and common parameters, the results of high-resolutioncosmological zoom-in simulations can be robust and reproducible. New codegroups are invited to join this comparison by generating equivalent models byadopting the common initial conditions, the common easy-to-implement physicspackage, and the proposed calibration steps. Further analyses of thesimulations presented here will be in forthcoming reports from ourCollaboration.

The AGORA High-resolution Galaxy Simulations Comparison Project. III: Cosmological zoom-in simulation of a Milky Way-mass halo