One sentence of instructions for every meta description on your site

Bulk-generating meta descriptions has one annoying failure mode: you end up fixing the same small thing by hand on page after page. A price that will change next month. A chatty tone on a site that should sound formal.

So in RankBotAI we added global instructions. You tell the AI once, for example "never mention prices" or "write in a formal tone", and it follows that on every page it optimizes, instead of you repeating it per page.

Now I'm curious what rules people actually need. If you could give the AI that writes your site's meta descriptions exactly one rule, what would it be?