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One voice file feeds every prompt on this page. Write it once, point every prompt at it, and your ad copy stops reading like a model and starts reading like your brand.

Copy is the cheapest place in DTC to leak money. A sharp image with a flat hook still tanks. The fix is not a cleverer one-off prompt. It is one piece of context, written once, that every prompt below reads from.

The one rule that makes all of this work: voice.md

AI gets you most of the way on copy. It handles roughly 80%; the final 20% stays human. That last fifth is brand nuance, compliance, and the emotional truth you know about your customer that a model never will. The goal is not to write the human out. It is to get the 80% in seconds, on-brand, so your time goes into the part that moves a buyer.

You do that with a voice.md file. Write it once. It holds:

• Tone. How you sound. Dry, warm, clinical, playful.
• Banned phrases. The words your brand never uses.
• Example lines. Three to five real sentences in your voice, so the model has something to pattern-match against.
• Claims you can and cannot make. Compliance lives here.

Then every prompt on this page points at it. Whether AI copy sounds like you or sounds like AI comes down almost entirely to one thing: did the model have a voice file to read. A connected Claude with no voice file just generates generic copy faster.

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Steal this: a voice file is the single highest-return thing you can build for copy. Drop it in your project's .claude/skills/ folder, or keep it as voice.md in the project root and name it in the prompt. You write the brand rules once and stop re-pasting them into every session.

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Which model for which job

Claude is the stronger writer and creative director: it holds brand nuance and reads voice.md cleanly. ChatGPT tends to give you more raw concept volume per pass. The practical split: ideate breadth in ChatGPT if you want a wide net, then write and polish in Claude with the voice file loaded.

None of these copy tools ship an official MCP connector. Claude is the host. The others you use in their own app or paste into Claude.

The four prompts