This mod adds a new village structure: The Recruitment Center.
It is a good place to keep recruited villagers [although they will roam around freely through the village]. That being said, villagers can now be recruited, which makes them attack many hostile mobs and follow anyone with a trumpet or loudspeaker in their hand.
All you have to do is left-click on them with a contract! Also, it allows people to craft ?build kits?, which villagers can use to instantly create structures. Simply get the kit in hand and left-click on the villager!
NOTE: Loudspeakers and trumpets are the same item; the config file determines which one is used and which one isn’t. That being said, the crafting recipe also changes.