Feb 24, 2026

AI tone rules

You can now define tone of voice rules that control how AI sounds in customer-facing replies. Add plain-language instructions like “Use simple language and avoid jargon,” and they will be applied AI-generated messages. This helps you keep replies consistent and true to your voice across your workspace.

To use this feature, go to Settings → Plain AI → Configuration → Tone of voice. You can specify rules for five categories – Empathy, Language, Formality, Personality, and Warmth. You can create your own rules or generate suggestions from a style guide.

Once applied, these rules apply to AI-generated customer replies in your workspace – Ari responses, suggested responses, Sidekick draft replies, and Help Center AI chat. Read more in our Help Center article.

Designed, built and written by

Ethel Ng

Engineering

Julius Yanik

Design

Join the teams who rely on Plain to provide world-class support

Join the teams who rely on Plain to provide world-class support

Join the teams who rely on Plain to provide world-class support