Most item descriptions are a feature list. The buyer reading it is not shopping for features, they are trying to answer one question: will this work for what I am building? A description that answers that outsells a longer one that does not.
Say who it is for in the first line
Not "a powerful, modern, fully responsive solution". That describes every item on the marketplace. Say "a booking system for salons and barbershops with staff rotas and deposit payments". A buyer who runs a gym now knows to move on, and that is a good outcome: you have saved yourself a refund request.
Answer the questions your tickets keep asking
Go through your last twenty support messages. The questions that come up more than twice belong in the description, not in your inbox. Common ones worth stating plainly:
- What PHP or Node version it needs, exactly
- Whether it needs a specific database, and which versions you have run it on
- Whether it works on shared hosting, or needs a VPS
- What is not included: no mobile app, no payment gateway beyond the two you built
Write the limits down
Sellers worry that naming limits costs sales. It costs the wrong sales. A buyer who finds out after paying that your script does not do multi-currency raises a refund and a one-star review. The same buyer, told upfront, either accepts it or buys something else without ever being disappointed.
Structure beats length
Break it into short sections with real headings: what it does, what you need to run it, what is included in the download, what is not. A buyer scanning for one answer finds it. A wall of paragraphs makes them ask you instead.
