Dear all, in one of my tools I'm populating a list of possible choices from a file in the history using the <options from_dataset> tag. Now using the tool as part of a workflow, the choices are not calculated at the setup stage, but I have to enter free-text and Galaxy seems to evaluate whether that's a legal choice only when the specific tool starts running (way down in my workflow). Is there any workaround for this behavior, so that choices are presented before workflow execution?

In general, no, the dataset content is not known at workflow runtime so the options field cannot be populated then. However, in the special case that the <options_from_dataset> tag is used for a tool that has a direct input dataset for the workflow, this would be possible (and desirable); for this case, a Trello card would be useful. Best, J.