Companion

Two or more actions in the same agent share the same name, typically caused by overloaded @Action methods.

Agent class has no @Action or @Condition methods and no goals defined.

An action has preconditions whose backing methods take more than one parameter.

A condition method takes more than one parameter.

Agent has no goals, so it can never be considered complete.

Agent has goals but no actions, so no plan can ever reach them.