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Brand voice AI: how to keep AI-written copy on brand

Downloads | AI governance and risk, AI playbooks, Sales and marketing leaders

A brand used an agent to write 500 product descriptions and had a first draft in under an hour. Then a junior marketing manager spent a week fixing the same clichés, tone problems and missing details on a loop. The agent had not saved work; it had moved it.

The fix treats brand voice as a system: a Brand Constitution of machine-readable rules, and a second agent that grades every draft against them.

The problem in numbers

  • 500 product descriptions drafted in under an hour
  • 1 week of manual editing to fix them
  • 20 of your best pieces to extract the rules from

Example as reported in aiblBRIEF

Why does AI copy drift off brand?

Because brand voice lives in people’s heads: unwritten rules, past decisions and judgement built over time. None of it is in a prompt unless someone writes it down. At scale, the same mistake repeated 500 times becomes an editing tax.

What goes in a Brand Constitution?

A core principle, an audience assumption, forbidden phrases, mandatory elements, sentence rules and tone rules. In the example, every product description had to state its material and country of origin, and stock marketing clichés were banned.

How does the critic agent work?

It does not write. It grades each draft against the constitution and returns pass or fail, the rules broken and instructions for the writer. Forbidden phrases and missing elements fail; minor structure issues pass with a note. Make or Zapier connects the writer and critic.

Key takeaways

  • Write the implicit rules down. Instinct has to become syntax.
  • Start from your best work. Extract rules from 20 pieces that performed.
  • Keep the critic narrow. It grades; it never writes.
  • Fail the serious issues. Forbidden phrases and missing details should block a draft.

What’s in the full guide

If AI-written copy is costing your team time to fix, the full guide shows how to build the system:

  • The Brand Constitution schema, with examples
  • The prompt to extract rules from your best writing
  • The critic agent’s system prompt
  • The scorecard for pass and fail
  • How to connect writer and critic

This guide first appeared in aiblBRIEF. Read the original article: The Brand Constitution: how to automate brand governance.

Keep AI copy on brand

Brand voice AI: how to keep AI-written copy on brand
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