The following zenscript code:

import mods.artisanworktables.Recipe;
import mods.artisanworktables.Type;

var hammer = <item:minecraft:iron_pickaxe>.withTag({display: {Name: "{\"text\":\"Hammer\"}"}});
Recipe.type(Type.BASIC)
  .shapeless([<item:minecraft:stone>])
  .output(<item:minecraft:cobblestone>)
  .tool(hammer, 10)
  .register();

shows a pickaxe with correct display name, Hammer, in JEI. However, recipes currently ignore any NBT tags added to the tool, and will work with an iron pickaxe that isn't renamed.

It seems to me that recipes should match the NBT data of tools, except durability of course. Or there should at least be an optional parameter to match NBT.