The short answer
A useful Client Writer's Guide tells AI and human writers who the content is for, what the business offers, and how the writing should sound. It identifies approved evidence, terminology, and claims that need confirmation. It also explains how a draft will be edited and approved. The guide directs the first draft; it does not replace a topic-specific brief or human review.
A closer look
Start with the audience, the offer, and the questions the content needs to answer. Add the business facts and supporting evidence that writers may use, along with the voice, terminology, and examples that fit the brand. Identify any facts that are still open rather than inviting AI to fill the gaps.
The guide should also state which claims require evidence or client approval and what the human review process looks like. A topic-specific brief still has to define the purpose and structure of an individual piece. The guide supplies reusable direction; a person remains responsible for editing and the client remains responsible for approving client content.
Use the AI content and writing guide to check the inputs, editing and approval steps your writers need.