ludic/docs/language/ecs/kw-enable.md

id	name	category	kind	tokens	sig	tip	order
kw-enable	enable	ecs	keyword	enable	enable Prop on entity	Re-activate a disabled property, model, or handler — its data is intact.	4

enable reverses a disable: it turns something back on without recreating it. enable Prop on instance restores a property's has-flag so queries match the instance again, with the field values exactly as they were left — nothing was copied or freed, so re-enabling is cheap and lossless. There are three scopes, matching disable: a single property on one instance (enable Shield on self()), a whole model (enable Enemy, all its instances rejoin every query), and a handler (enable AiThink, it resumes running each phase). Re-enabling a property fires any @OnEnable(Prop) hook at the toggle point. Reach for enable/disable when you want to pause and resume, and for attach/detach when you want to add or structurally remove.

program ShieldToggle {
  property Position { column: int = 0, row: int = 0 }
  property Shield   { amount: int = 0 }
  model Player { Position, Shield }

  handler Boot phase Start {
    spawn Hero { Position { column: 8, row: 8 }; Shield { amount: 3 } }
    disable Shield on self()
  }

  handler RestoreShield phase Update {
    if Input.key() == ' ' {
      for (position) in query [Position, {Player}] { enable Shield on self() }
    }
  }
}