A Voice Spec Block is a reusable written description of how your brand sounds: trait pairs with boundaries, banned words, rhythm rules, sample lines, and claim limits. You write it once, paste it into the guardrails layer of every brief, and your AI output stops sounding like everyone else's.
What is a Voice Spec Block?
Lessons 2 and 3 gave you a brief structure and a way to show examples. Both improve one prompt at a time. Voice is different: it should be identical across every prompt, every channel, every teammate. Retyping it is how drift happens, and drift is how a brand ends up sounding like four different companies.
The Voice Spec Block solves this with a single documented artifact. Five components, half a page, written once. Most companies never write this down at all, which is exactly why most AI-assisted content is interchangeable. The half hour you spend on this lesson is the highest-leverage half hour in the track.
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Frequently asked questions
- 01What is a Voice Spec Block?
- A reusable half-page description of how a brand sounds, written for AI prompts. It contains voice trait pairs with boundaries, banned words, rhythm rules, two or three real sample lines, and claim limits. It pastes into the guardrails layer of every brief.
- 02How do you describe brand voice to AI?
- Use this-but-not-that trait pairs instead of single adjectives, list banned words explicitly, state rhythm rules like sentence length and punctuation, and include two or three real sample lines. Boundaries and examples work; standalone adjectives like "friendly" do not.
- 03How long should a brand voice description be for prompts?
- Around 80 to 120 words. Long enough to cover trait pairs, banned terms, rhythm rules, sample lines, and claim limits, short enough to paste into every single brief without trimming. Consistency matters more than completeness.