Drafts actions that work with Things are based on URL schemes. Things provides a cool Link Builder tool to build URLs for use with integrations, that create URLs with all the proper values for things like the list to target.
I would start with that tool to generate a URL for use in Drafts. The key bits that would be specific to Drafts would be using template tags for the values you want to insert from your draft when creating the task. Most commonly, these values would be [[title]] for the “title” value and [[body]] for the “notes” (if you have more specific needs, read about Drafts templates).
Once you get the URL from that tool, I would:
- Duplicate your “Task in Things” action in Drafts (long press on iOS, right-click on Mac).
- Edit the copy, and paste the new URL in the “template” field of the one “Callback URL” action step.
- Change the name and any other values (e.g. “Task in MY-LIST”.
Hope this helps!