  In less than a year, the James Webb Space Telescope (JWST) will inherit the
mantle of being the world's pre-eminent infrared observatory. JWST will carry
with it an Aperture Masking Interferometer (AMI) as one of the supported
operational modes of the Near-InfraRed Imager and Slitless Spectrograph
(NIRISS) instrument. Aboard such a powerful platform, the AMI mode will deliver
the most advanced and scientifically capable interferometer ever launched into
space, exceeding anything that has gone before it by orders of magnitude in
sensitivity. Here we present key aspects of the design and commissioning of
this facility: data simulations ($\texttt{ami_sim}$), the extraction of
interferometeric observables using two different approaches
($\texttt{IMPLANEIA}$ and $\texttt{AMICAL}$), an updated view of AMI's expected
performance, and our reference star vetting programs.
