The above page is missing information about the 'newly' (may 2025) added add_folder and remove_folder functions.
Additionally, no information is given regarding how a developer desiring to work with those functions can learn the UUID of a specific inventory folder to call in the command(s) or in conjunction with the pre-existing wear_folder - no viewer UI seems to exist to "get UUID" of a folder.
These new features were mentioned here: https://www.firestormviewer.org/new-features-coming-soon-part-2/ in the section titled "New SLAPPS".