February 9, 2025

How to Brief a Shopify AI Agent on Brand Voice Without a 12-Page Deck

Customers forgive a late parcel. They do not forgive a reply that sounds like a hold message. Voice is a rule set, not a mood board.

Who this is for

DTC brands with a strong site voice that dies the moment a ticket arrives.

Default model voice is polite corporate. Your site is dry, funny, or blunt. The gap makes the agent feel like a contractor.

Voice is easiest to get right and easiest to overdo. You want recognisable, not a bit.

Give 8 real replies you were proud of. Mark what to copy: sentence length, greetings, sign-off.
Ban: 'utilize', 'inconvenience', 'your valued custom', exclamation spam.
Write the 'no' template: short reason, the rule, the next allowed option.
Write the delay template: last scan, what you will do at hour X, no novel.
Re-read 10 live sends after you change the brief. Voice drifts.

Humor never on money, damage, or kids products.
No slang the founder uses on TikTok if the buyer is a 54-year-old gifting a mattress.
Match the customer's language when you have the locale. Do not slang-translate.

CSAT comments that mention tone. Also founder cringe rate — informal but real. If the founder winces weekly, rewrite the brief.

Can one agent cover US and UK voice? Yes if you keep it plain. Localise spelling and return addresses, not jokes.

Do I need a copywriter? A support lead with 20 good tickets is enough. A copywriter who never sat the queue is not.

Should AI use the customer's first name? If Shopify has it and it is not a gift-with-surprise. Never on a gift order tagged as such.

Does Relay take a voice brief? Yes. Short examples beat adjectives. Bring the 8 tickets.

Drop your best 8 replies into Relay and retire the bank-voice drafts.