I find it interesting that your example is a one-off section on uses of the craftsmanship skill, and that there's *nothing* in the chapters on combat implying that you can do this in a combat setting.
I direct you to YS308, where it points out that intent precedes mechanics. If your intent is to deprive your opponent of the use of their weapon, that's a maneuver to disarm. If the intent is to *permanently* deprive them the use of their weapon, that's trying to inflict a consequence on them - a straight up attack, albeit possibly one preceded by a maneuver to declare a called shot. If you succeed, then they can accept the suggested consequence (broken weapon), or substitute one of their own (like sprained wrist, or broken wrist, or what-have-you, depending on the level of consequence involved.)