Compile addons in tools GameData.LoadEntitiesFromPackage works with addons Save / load map entities' addon packages to meta data Download and use addons specified by the map at runtime for local maps Entity tool can use packaged addons tagged map + entity Mount addons from map package meta MapAddons When publishing a map, set meta MapAddons from the map's metadata ( messy, improvements to be made since it's a single asset workflow really )