Microsoft Advertising added messaging guidelines to text guardrails for AI Max copy

Microsoft Advertising added a messaging guidelines component to its text guardrails, so advertisers can name themes, claims, products, offers or topics for autogenerated AI Max assets to emphasise or avoid rather than only excluding terms. Text guardrails now hold up to 25 term exclusions and up to 40 messaging guidelines, and the feature is in a closed pilot.

The addition follows a September 2026 rename from 'text guidelines' to 'text guardrails'. Microsoft advises setting guardrails up before entering the Final URL during campaign setup.