Not sure that library creation is doable (been ages since I looked). I always found it easier to manage them in a file and move the materials from file A to file B by assigning them to a family in file A, and moving the family into file B.
Yet an update with +20 new nodes…
Nodes for BuiltInParameter. Nodes for copying and transferring elements between different document. Nodes for opening, save and closing central files. Nodes for linking files into documents.
Update on behalf of Erik…
Minor release 134.5.0 / 202.5.0 and major release 210.0.0
Please address all queries to Github.
Thanks to Erik for all his hard work