AI listing tools: what to check before you publish AI-written copy

AI writing tools draft a product title, bullets and description in seconds, but they write fluent sentences whether or not the sentences are true, and the marketplace holds the seller responsible for every word. Before publishing AI-written listing copy, check each fact against the product's package or specification, delete any feature, number or claim you cannot show, remove the words each marketplace bars, and use each keyword once where it fits. Walmart's rules for AI content, published on 3 April 2026, say sellers are "responsible for reviewing and substantiating AI-generated content before publication."

Can you use AI to write product descriptions for a marketplace?

Yes. Amazon, Walmart, Etsy and eBay do not ban AI-written listing copy, but the seller is responsible for it. Walmart's guidelines for AI content say "All claims, images, and descriptions must match the actual product including size, color and other features", and that "it's strictly prohibited to use AI-generated content that misrepresents a product." Walmart's guidelines also bar unsupported or unsafe claims and fabricated reviews or endorsements.

For a seller with a hundred products, an AI writing tool is a real saving of time. The tool moves the hard part of listing copy from writing to checking.

What do AI writing tools get wrong in listings?

AI writing tools are good at persuasive sentences and poor at knowing what is true of a particular product. The table below lists the common errors in AI-written listing copy, with a made-up example of each.

None of these errors looks wrong at a glance, and every one is a problem for the seller: a return when the product does not do what the copy said, a removed listing when the copy uses a barred claim, and for health and children's products, a legal problem.

Which words in AI copy break marketplace rules?

AI tools reach for the words marketplaces bar, because those words are common in the advertising the tools learned from. The barred words differ by marketplace, so copy that passes on one marketplace can break another's rules.

Health and beauty claims need the most care. A claim to treat or prevent disease changes what a product legally is. The supplement rules, the cosmetics and skincare rules and the medical device rules cover where each line sits, and the article on FDA approved, cleared and registered covers the FDA words a listing may use.

How do you check AI-written copy against the product?

The most reliable check of AI listing copy is to put the copy beside the product, its package and its specification, and confirm every factual statement.

1. Highlight every fact in the AI copy: each number, material, feature, count, size, certification and claim.
2. Find each fact on the package, the label, the specification or a test report.
3. Delete each fact you cannot find. If the copy says "BPA-free" and the package does not, "BPA-free" goes.
4. Correct each fact that differs. If the copy says 32 oz and the label says 30 oz, use the label's figure.
5. Check claims by category: health, environmental, safety, origin and certification claims need proof, not only a source.
6. Read the copy once more as a sceptical buyer. Any line that sounds too good is the next line to check.

For health products, regulators judge an advertisement by its whole impression, and health claims need competent evidence, as a law firm's summary of the FTC's 2022 Health Products Compliance Guidance explains. A fluent sentence that implies a health benefit is a health claim.

What does a line-by-line check look like?

A made-up example shows the check on one AI-written Amazon bullet for a ceramic mug:

Premium handcrafted ceramic mug, microwave and dishwasher safe, keeps coffee hot for hours, eco-friendly lead-free glaze, perfect gift for coffee lovers

Checked against the mug's box and the supplier's specification:

• "Handcrafted": the supplier's specification says machine-made. Delete.
• "Microwave and dishwasher safe": printed on the box. Keep.
• "Keeps coffee hot for hours": single-walled ceramic, with no test. Delete.
• "Eco-friendly": no evidence, and a phrase Amazon lists among those not allowed in bullets. Delete.
• "Lead-free glaze": on the specification, with a test report. Keep, if the report covers the glaze on this mug.
• "Perfect gift": subjective. Delete.

The checked bullet reads: "Microwave and dishwasher safe: ceramic mug with a lead-free glaze, 350 ml". The checked bullet is shorter, and every word in it can be shown.

How do you tell placed keywords from stuffed keywords?

AI tools asked to "optimise for SEO" often repeat phrases, and repetition hurts a listing. Amazon's advice says "Keyword stuffing can create a poor customer experience and hurt your rankings", and that a key phrase used once does not need repeating. Walmart's title rules bar repetitive keywords.

Four signs of keyword stuffing in AI copy:

• the same phrase in the title, every bullet and the description
• a list of keywords at the end of a description
• sentences that exist only to hold a phrase ("This water bottle is the water bottle for water bottle lovers")
• other brands' names added "for comparison"

Placed keywords read naturally: the main phrase once in the title, related phrases where they describe a real feature, and synonyms in a field built for them.

How do you get better copy from an AI writing tool?

Most invented claims in AI listing copy come from a tool filling gaps in what it was told, so the fewer gaps a seller leaves, the fewer the tool fills.

• Give the AI tool a fact sheet: measurements, materials, what is in the box, care, origin, certifications held and warnings, copied from the label.
• Tell the AI tool the limits: use only these facts; add no features, numbers or claims; write to the marketplace's length limits.
• Ask the AI tool to list the facts it used under the copy, so each one can be checked quickly.
• Give the AI tool the marketplace's barred words for the category, and ask it to avoid them.

Even with a fact sheet, check the result line by line. A tool told not to invent will still sometimes invent; the fact sheet makes the check faster, not unnecessary.

How do you check AI copy for a whole catalogue?

Line-by-line reading of hundreds of AI-written listings is slow. Five habits keep the quality of a large catalogue up:

1. Check the first ten listings from any new tool or prompt in full. AI errors repeat, so an error found early is fixed once rather than hundreds of times.
2. Search the whole batch for barred and risky words: "eco", "non-toxic", "guarantee", "best", "FDA", "cure", "certified".
3. Spot-check every size and count against the specification.
4. Have a second person read every regulated product in full: health, beauty, food and children's products.
5. Keep a list of the errors found, and add them to the instructions for the next batch.

Does Amazon write listing copy with AI too?

Yes. Amazon said in 2024 that it would use AI to suggest compliant bullet points for sellers to review before publishing. From 27 July 2026, Amazon began replacing titles longer than 75 characters with recommended versions, giving brand owners 14 days to review them.

The same check applies to text a marketplace writes. A recommended Amazon title may keep a word a seller would drop, or drop the word the seller's shoppers search for. Review a marketplace's suggested copy with the same care as a tool's output.

When should you write listing copy by hand?

Some listing copy is better written by a person, even with an AI tool to hand:

• Products with legal lines, such as warnings, age grades, supplement statements and pesticide registration numbers. The wording is fixed, so copy the lines exactly from the label.
• Regulated categories: health, beauty, food and children's products, where the cost of a wrong word is high.
• Handmade and small-batch items, where how the item was made is the product's story.
• Any line the AI tool got wrong twice. If a tool keeps inventing a feature, write that part by hand.

What should you look for in an AI listing tool?

Five questions separate a listing tool worth trusting from one that writes fluent guesses:

• Does the tool write from my product's facts, or from what similar products usually say?
• Does the tool know each marketplace's rules, and keep barred words out?
• Does the tool say when a claim needs proof, rather than writing the claim anyway?
• Does the tool show where a phrase came from, so I can check it?
• Can I edit every line before the copy goes out?

A checklist before publishing AI-written listing copy

1. Every fact found on the package, label, specification or a test report.
2. No feature, number or certification you cannot show.
3. No marketplace-barred words or symbols.
4. No health, environmental or safety claim without evidence.
5. No superlatives or comparisons with other brands.
6. Each keyword used once, where it fits.
7. Read aloud, the copy sounds like a person describing this product.

A practical rule for time: budget as much time for checking AI copy as the tool saved on writing, until the tool has earned your trust on your products.

How Commicorn helps

Commicorn writes listing copy with these checks built in:

• Written from your facts. The copy comes from the details you give us about the product.
• Claims checked. Wording a marketplace bans is kept out, with the reason shown, and a claim that needs proof is marked with what the marketplace asks for.
• Keywords you confirm. A keyword naming a feature your details do not state is offered only if you confirm it is true.
• Each marketplace's rules applied: lengths, banned symbols and repeated words.
• Every line yours to change before you export.

Commicorn writes from your product's facts and marks claims to check. Start free.

Questions sellers ask

Does Amazon allow AI-written product descriptions?

Amazon does not ban AI-written listing copy, and Amazon itself uses AI to suggest bullet points for sellers to review. The copy must still meet Amazon's rules, such as the restricted phrases and symbols in bullet points.

Who is responsible for mistakes in AI-written listing copy?

The seller is. Walmart's guidelines for AI content, published on 3 April 2026, say sellers are responsible for reviewing and substantiating AI-generated content before publication, and that AI content must not misrepresent a product.

What is the most common mistake in AI product descriptions?

Invented facts are the most common mistake: a feature, number, size or certification the product does not have, often borrowed from similar products. Checking every fact against the package or specification catches invented facts before they reach a listing.

Can AI-written copy use words like "eco-friendly" or "non-toxic"?

Only with evidence, and some marketplaces restrict the words regardless. Amazon lists "eco-friendly" among phrases not allowed in bullet points, and the FTC's Green Guides require evidence for environmental claims.

Is keyword repetition in AI copy good for search?

No. Amazon says keyword stuffing can create a poor customer experience and hurt a listing's position in search, and Walmart's title rules bar repetitive keywords.