This is a helper plugin that allows you to create trigger actions for when preset of a given type is loaded.
https://hub.virtamate.com/resources/preset-loaded-triggers.45148/

One example use case is to trigger calibration on Naturalis every time an appearance preset is loaded.
If you have a lot of appearance presets and want to build up cached Naturalis v1.3 calibration results for all your presets, you can use ky1001's Preset Loader plugin to load presets automatically one after another. However you probably need to do multiple passes on the entire catalogue because each body shape has a few different unique identifiers that Naturalis generates based on the exact current positions of skin vertices. There needs to be a handful of unique calibration results to be stored before it reliably loads one of those cached results every time (for a given set of plugin parameters, e.g. defaults).
-everlaster