  We present the Model-Agnostic Dark Halo Analysis Tool (MADHAT), a numerical
tool which implements a Fermi-LAT data-driven, model-independent analysis of
gamma-ray emission from dwarf satellite galaxies and dwarf galaxy candidates
due to dark matter annihilation, dark matter decay, or other nonstandard or
unknown astrophysics. This tool efficiently provides statistical upper bounds
on the number of observed photons in excess of the number expected, based on
empirical determinations of foregrounds and backgrounds, using a stacked
analysis of any selected set of dwarf targets. It also calculates the resulting
bounds on the properties of dark matter under any assumptions the user makes
regarding dark sector particle physics or astrophysics. As an application, we
determine new bounds on Sommerfeld-enhanced dark matter annihilation in a set
of eight dwarfs. MADHAT v1.0 includes 58 dwarfs and dwarf candidate targets,
and we discuss future planned developments. MADHAT is available and will be
maintained at https://github.com/MADHATdm
