Prompts / Business and marketing
Product Listing Writer With Self-Check
You get a listing where every claim is tied to a real fact, plus a checked title length. The self-check step makes the model catch its own stuffing and invented claims before you publish.
Worked in our testThe reply followed nearly every step: keywords sorted sensibly, facts traced to the brief, a correct claim table, and an accurate 61-character count. It is weaker on two points. The title adds the port configuration beside the capacity, which blurs the "one selling point only" rule. It also pairs "Power Bank" with "Carregador Portátil" yet declares no keyword stuffing.
The prompt
Act as an experienced ecommerce listing editor who writes compliant, high-converting marketplace product titles and descriptions.
Task: Turn the product brief below into a ready-to-publish listing for {marketplace}, using only facts from the brief.
Product brief: {product_brief}
Keyword list: {keyword_list}
Steps:
1. Sort the keywords into three groups: core terms, descriptive terms and terms to avoid (misleading, banned or unsupported by the brief).
2. Choose one single main selling point and build the title around it. Do not use more than one.
3. Write a title and a short description. Every claim must trace back to a fact in the brief.
4. Self-check: count the title's characters, list any keyword stuffing, and flag any claim you cannot trace to the brief.
5. Fix every problem found, then re-check once.
Output:
Return the final title, the description, and a short table with the headings Claim, Source fact in brief, and Status. Finish with the title's character count.
Change the parts in curly braces. Use it when you list products on a marketplace with strict title limits and rules on claims, and you want a first draft you can trust.
What happened when we ran it
We sent
Act as an experienced ecommerce listing editor who writes compliant, high-converting marketplace product titles and descriptions. Task: Turn the product brief below into a ready-to-publish listing for Shopee Brazil (title limit 120 characters), using only facts from the brief. Product brief: Portable power bank, 20,000 mAh, two USB-C ports and one USB-A port, 22.5W maximum output. Weighs 380 g. Includes a 30 cm USB-C cable. Has a small LED display showing remaining battery percentage. Allowed on aircraft in hand luggage. Sold with a 12-month seller warranty. Keyword list: power bank, carregador portátil, 20000mah, fast charge, best power bank, cheap, iPhone charger, USB-C, viagem, 100% safe, original Apple Steps: 1. Sort the keywords into three groups: core terms, descriptive terms and terms to avoid (misleading, banned or unsupported by the brief). 2. Choose one single main selling point and build the title around it. Do not use more than one. 3. Write a title and a short description. Every claim must trace back to a fact in the brief. 4. Self-check: count the title's characters, list any keyword stuffing, and flag any claim you cannot trace to the brief. 5. Fix every problem found, then re-check once. Output: Return the final title, the description, and a short table with the headings Claim, Source fact in brief, and Status. Finish with the title's character count.
The model replied
## Keyword groups
| Group | Terms |
|---|---|
| Core | power bank, carregador portátil, 20000mah, USB-C |
| Descriptive | viagem (supported only through the hand-luggage fact) |
| Avoid | best power bank (unsupported superlative), cheap (price claim), iPhone charger (compatibility not in brief), 100% safe (unsupported), original Apple (false and trademark risk), fast charge (not in brief; I use the factual "22,5W" instead) |
**Single main selling point:** 20,000 mAh capacity.
## Final title
**Power Bank 20000mAh Carregador Portátil com 2 USB-C e 1 USB-A**
## Description
Power Bank de 20.000 mAh, um carregador portátil para levar com você.
**Características:**
- Capacidade: 20.000 mAh
- Portas: 2 USB-C e 1 USB-A
- Potência máxima de saída: 22,5W
- Display LED pequeno que mostra a porcentagem de bateria restante
- Peso: 380 g
- Permitido em bagagem de mão em aeronaves
**Itens inclusos:**
- 1 Power Bank
- 1 cabo USB-C de 30 cm
**Garantia:** 12 meses de garantia do vendedor.
## Claim check
| Claim | Source fact in brief | Status |
|---|---|---|
| 20.000 mAh / 20000mAh | "20,000 mAh" | OK |
| 2 USB-C e 1 USB-A | "two USB-C ports and one USB-A port" | OK |
| Saída máxima de 22,5W | "22.5W maximum output" | OK |
| Display LED com porcentagem | "small LED display showing remaining battery percentage" | OK |
| Peso 380 g | "Weighs 380 g" | OK |
| Cabo USB-C de 30 cm incluso | "Includes a 30 cm USB-C cable" | OK |
| Permitido em bagagem de mão | "Allowed on aircraft in hand luggage" | OK |
| Garantia de 12 meses do vendedor | "12-month seller warranty" | OK |
| "Carregador portátil" / "Power Bank" | Describes a portable power bank | OK |
| "Carga rápida", "melhor", "barato", "100% seguro", "original Apple", "para iPhone" | Not in brief | Removed |
## Self-check
- **Keyword stuffing:** none. Each term appears once in the title, and "Power Bank" and "Carregador Portátil" are one natural product name.
- **First-pass issue:** I had "viagem" in the title, which only indirectly follows from the hand-luggage fact. I removed it and kept the fact in the description. The re-check found no other problems.
- **Single selling point:** the title leads with capacity. The ports are specs, not a second pitch.
**Title character count: 61 / 120**
Run on Claude Sonnet 5.5, 03 Nov 2026. Automatic check: 4 out of 5.
Mentioned for
ChatGPT, Claude, Gemini
Where it came from
Found on GitHub, shared by heqiangdiao-wq: heqiangdiao-wq/AI-Cross-Border-Ecommerce-Agent-Toolkit.
This is our own version of the idea, written and tested by us. The original may differ.