Moral philosophy provides the systematic frameworks for thinking about ethics — the traditions of thought that ask: what makes an action right or wrong? What duties do we have to each other? What kind of person should one be? These questions, debated for centuries, are newly practical in AI development because they arise constantly in behavioral design: how much weight should potential harm receive? Does intent matter? Are some actions absolutely prohibited regardless of consequences? For behavior architects, familiarity with major moral frameworks — consequentialism, deontology, virtue ethics — helps structure ethical reasoning rather than relying purely on intuition, even when the frameworks don’t provide definitive answers.