Hi, Your latest update is very exciting with the introduction of Dataset_Collections!!! It's very useful for us . I've been testing it in a new install of Galaxy and I can create a Dataset_Collection in my history. But with the reading of trello cards and this presentation https://docs.google.com/presentation/d/1D4pbULfe3IbSRVF3xsWvp9GyAct4SNfHhufI... I've not yet found how to code a tool to