use cottages:hammer, remove xdecor:hammer

craftitems.lua

@@ -21,11 +21,5 @@ minetest.register_craftitem("xdecor:bowl_soup", {
 	end
 })
 
-minetest.register_tool("xdecor:hammer", {
-	description = "Hammer",
-	inventory_image = "xdecor_hammer.png",
-	wield_image = "xdecor_hammer.png",
-	on_use = function() do return end end
-})
-
+minetest.register_alias("xdecor:hammer", "cottages:hammer")
 minetest.register_alias("xdecor:honey", "mobs:honey")

depends.txt

 default
 bucket
+cottages
 mobs
 homedecor
 doors

workbench.lua

@@ -155,7 +155,7 @@ function workbench.put(_, listname, _, stack)
 	local stackname = stack:get_name()
 	if (listname == "tool" and stack:get_wear() > 0 and workbench:repairable(stackname)) or
 	   (listname == "input" and minetest.registered_nodes[stackname.."_cube"]) or
-	   (listname == "hammer" and stackname == "xdecor:hammer") or
+	   (listname == "hammer" and stackname == "cottages:hammer") or
 	    listname == "storage" then
 		return stack:get_count()
 	end