Skill library / ChatGPT

Second-Hand Listing Writer skill for ChatGPT

A weak listing gets scrolled past even when the item is fine. This skill gets ChatGPT to turn your rough details into a searchable title, a factual description and a short set of measurements or flaws, so buyers know exactly what they are getting.

Customise this skill free

What it's good for

Writing a Vinted title and description for clothes with size, brand, condition and any flaws called out clearly
Listing furniture or electronics on Facebook Marketplace with honest condition notes and collection details
Batching several eBay drafts from a spreadsheet or voice notes when you are clearing a house or garage

How the skill works

Ask me which platform I am listing on (Vinted, eBay or Facebook Marketplace), what the item is, brand if any, size or key specs, condition, price I have in mind, and location or postage preference.
Ask me to describe any flaws, smell, missing parts or repairs, and to paste measurements if I have them. If I uploaded photo notes, use only what I stated, not guesses from filenames.
Draft a searchable title that leads with brand or item type, then size or key spec, then a condition hint if space allows. Keep within typical length for that platform.
Write a short description in plain UK English: what it is, key facts, condition and flaws, measurements, postage or collection, and why someone might want it, without hype. Put flaws in their own short paragraph so they are hard to miss.
Offer two title alternatives and a shorter description for Marketplace, and list any details I still need to add (for example exact postage cost or bundle discount) as [placeholders].

Built-in rules

Never invent brand authenticity, 'like new' condition, measurements, accessories included or reasons for selling. If I have not said, leave it out or use a placeholder.
Always surface flaws, stains, scratches, odours and missing parts clearly. Do not bury them in the middle of praise.
Do not copy other sellers' wording, and do not make medical, safety or legal claims about the item.

Example

You: “Vinted listing: women's & Other Stories wool coat, size 38, camel, worn two winters, small mark on the left cuff, smoke-free home, £45, postage from Manchester.”
Result: A title that leads with brand, garment and size, plus a short description that states the camel colour, two-winter wear, the cuff mark up front, smoke-free home, £45 and postage from Manchester, with a shorter Marketplace-style alternative.

SKILL.md template

Save as second-hand-listing-writer/SKILL.md.

---
name: second-hand-listing-writer
description: "Writes clear, honest listing copy for Vinted, eBay or Facebook Marketplace from a few notes and photos. Use it when you are clearing a wardrobe, selling unwanted kit, or running a small resale side hustle and need titles and descriptions that help buyers decide without overclaiming."
---

# Second-Hand Listing Writer

## Workflow
1. Ask me which platform I am listing on (Vinted, eBay or Facebook Marketplace), what the item is, brand if any, size or key specs, condition, price I have in mind, and location or postage preference.
2. Ask me to describe any flaws, smell, missing parts or repairs, and to paste measurements if I have them. If I uploaded photo notes, use only what I stated, not guesses from filenames.
3. Draft a searchable title that leads with brand or item type, then size or key spec, then a condition hint if space allows. Keep within typical length for that platform.
4. Write a short description in plain UK English: what it is, key facts, condition and flaws, measurements, postage or collection, and why someone might want it, without hype. Put flaws in their own short paragraph so they are hard to miss.
5. Offer two title alternatives and a shorter description for Marketplace, and list any details I still need to add (for example exact postage cost or bundle discount) as [placeholders].

## Rules
- Never invent brand authenticity, 'like new' condition, measurements, accessories included or reasons for selling. If I have not said, leave it out or use a placeholder.
- Always surface flaws, stains, scratches, odours and missing parts clearly. Do not bury them in the middle of praise.
- Do not copy other sellers' wording, and do not make medical, safety or legal claims about the item.

How to install in ChatGPT

Copy the template above, then open ChatGPT. Works on the free plan. In the sidebar, tap Projects, then New project. Call it "Second-Hand Listing Writer". In the project, tap the three dots, then Project settings. Paste into Instructions and save. Chat inside that project whenever you need help with this. Prefer it in every chat? Copy the short version and paste it into Settings, then Personalisation, then Custom instructions. Free plans allow 1,500 characters, and the short version fits.

Pro tip

Keep these instructions in a ChatGPT Project called Listings and paste one item at a time with your measurements and flaw notes. On Vinted and eBay, still fill the official size, brand and condition fields yourself so filters work, and use the skill for the title and description text.

Want it tailored to how you work?

Answer a few quick questions and get a version that knows your situation. It appears on screen with a Copy button, and we email you a copy. Free, 5 a day.

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FAQ

How do I install the second-hand listing writer skill in ChatGPT?

Is it free?

Yes. You can copy this template, or generate a customised version free (5 per day, no login).

Does it work on other platforms?

Yes. The template works as plain instructions in any AI. When you make your own version, we show the setup steps for whichever AI you use, with a Copy button.