Tool

A reusable named action or analysis recipe, with a canvas that arranges the recipe as one chain.

advanced

A tool is a reusable named action. A web app button can run it. The detail page edits one of these kinds:

Open URL or open item
Export layer
Recipe: an ordered analysis recipe, including OSM as a source. Selection and "OSM features on the map" are outputs you can pick. Saving the result as a new derived layer or a new data layer is still disabled in that editor.
OSM relational query

A recipe can be opened on a canvas. Dragging a step changes where it sits. Runs after changes the sequence, and that sequence is what runs. The canvas keeps a single chain. It does not run a branch, a join, or a union. Derived layers are the shipped way to keep a spatial pipeline whose result is itself a layer.

See also