How to write a marketplace product listing with Claude

A product listing is the first thing a shopper sees on Amazon, Etsy or eBay. The title, photo and description decide whether they click or scroll past. Writing listings by hand is slow, and once you have hundreds of items, half of them never get done. Claude takes that grind off your plate: you give the facts about the product, it assembles the title, description and specs in the format you need. Here is how to get copy that sells instead of copy that reads like filler.

Why hand the listing to an AI if you can write it yourself?

It is not that Claude writes more beautifully. It is speed and even quality. You will write one listing well on your own. By the twentieth your attention drops, phrasing repeats, and half the product's benefits get forgotten. The model holds the same level on item one and item one hundred. You stop being a copywriter and become an editor: you set the facts, check the result, fix the details. That is a different and much faster job.

What should you gather before the first prompt?

Claude does not know your product, so garbage in means garbage out. Before you open the chat, put together a short brief:

• what the product is, what it is made of, size and weight;
• who it is for and what shopper problem it solves;
• three or four core benefits, not just raw specs;
• how you differ from the neighbouring listings in search;
• the keywords people should find you by.

That is five lines, not a page. But those lines turn generic text into something specific.

What does a working listing prompt look like?

Do not ask for a bare "write a product description". Give Claude a role, the facts and the limits. Something like:

"You are a marketplace copywriter. Write a listing for this product: [brief]. Format: a hooking title up to 100 characters, a selling description of 700-900 characters, five benefit bullets, and a spec block as a table. Write in plain shopper language, no jargon and no empty promises. Weave keywords in naturally, not as a comma list."

A prompt like this returns a full structure on the first try. After that you edit single lines, not the whole text.

How do you make Claude follow the platform rules?

Every platform has its own limits: title length, description size, where keywords are allowed and where they are not. Claude does not know your specific category, so set the limits yourself, right in the prompt: "title no longer than 60 characters", "no emoji in the description", "specs as a strict list". Take the exact numbers from your marketplace's seller help, which platforms publish openly and update from time to time. The rule is simple: a limit you did not name, Claude will not guess.

How do you check the description is not lying?

This is the dangerous part. Claude writes convincingly, and if something was missing from the brief it may invent a detail: a material, a warranty, a feature the product does not have. So read the finished listing like a shopper who will later leave a review. Check every number, material and claim against your own data. If a fact was not in the brief but shows up in the text, cut it. A false spec is not just a return, it is a platform penalty. We have a separate piece on why models make things up and how to catch it.

How do you produce five listings in the time of one?

Once the prompt template works, it becomes a flow. Set your platform rules and brand tone once inside a Claude project, then build every new listing there without re-explaining everything. Faster still: put a brief for ten products into a table and ask Claude to work through the rows. You get drafts in a batch, and your evening goes to checking rather than writing from scratch.

Where do you start today?

Take one product that sells worst and rewrite its listing with the scheme above. Compare the old text with the new one. The difference usually shows at once: instead of a spec list you get an answer to the shopper's question, "why is this right for me". Then you just repeat it across the rest.

More step by step walkthroughs for working with Claude are in our free materials: AGINE guides and the first free lesson, where you build your own Claude helper from scratch.

AGINE Academy is an independent product, not affiliated with Anthropic. Claude is owned by Anthropic.