The short answer
Pause the disputed part of the AI task. Identify which document governs that decision and whether a newer instruction was actually approved. If the authority is unclear, ask the business owner or relevant expert rather than letting AI choose the version that sounds better. Record the decision in the brief or governing source before continuing so the next task uses the same direction.
A closer look
A task brief can be newer than a reference document and still be wrong; an older document can also have been deliberately superseded. Compare what each source covers, who approved it, and whether the newer direction was meant to replace the older one. Do not let the model resolve a business decision by treating the most recently opened file as automatically authoritative.
For example, a client writer's guide might describe the business's full service range while the approved page brief covers only one service. That is not necessarily a conflict: the page brief sets the scope for that page. If the two sources disagree about a service claim, leave the claim out until the right person confirms it, then update the document that should govern future work.
