Yes all 3 tools in this mod have functionality! However, much like the comic, the intended purpose will remain a mystery. You must be the one to experiment and figure out what the tools do!
To start, grab an item that looks like it would make one of the above tools and then right click trade with any Cow to get the tool! The Cow does the crafting for you so take a good look at these tools. Then see if you can figure out what the base resource is that the Cow needs to make the tool you want!
See here for more details on the origin of Cow Tools from The Far Side comic by Gary Larson:
