Brand consistency starts with clear instructions. A useful voice guide should define your audience, tone, preferred terminology, common calls to action, formatting rules, and phrases to avoid. Include a few approved examples, but do not rely on vague directions such as sound professional. Explain what professional means for your business. If AI supports drafting, give it the same constraints you would give a new team member. Treat generated copy as a starting point, not an approved publication. Human review remains essential for accuracy, judgment, originality, and alignment with your brand.