Categories are about composition. Crafting is also about composition - using inference rules. https://en.wikipedia.org/wiki/Category_theory

The classic schematic representation of X Y Z shown on the above wiki page is basically a crafting rule to create Z. That is, if the AI knows about a "path" (think back to your homotopy training) from X and Y to Z then it can craft a Z from X,Y if it needs to

Yes this is exactly reverse to how we normally think about the caller/callee relationship