Should you assert input arguments ins

namespace Joust_.Manager {
    public static class GenerateSkillList {
        public static List<ISkill> AllSkills { get; } = GenerateSkillList.Setup();
        private static List<ISkill> Setup() {
            //do I have a better way to do this?
            AllSkills.Add(new Skills.Attack());
            AllSkills.Add(new Skills.Defend());
            AllSkills.Add(new Skills.Warcry());
            AllSkills.Add(new Skills.ThrowSmellyCheese());
            return AllSkills;
        }
    }
}