Listing check · 20 products · September 2026

Two errors in twenty products — and why nobody would have noticed

We ran a real twenty-product catalogue through our own listing check — not lines invented to fit our own parser, but live descriptions from a working store. Below is what it found, including what it found in our own code.

The numbers

Measured	Result
Products in the run	20
Semantic errors in finished listings	2
Of those, crashed or raised a warning	0
Lines with no measurable specs	17 of 20
Run time	under a second

Error one: a lip stain became a thermos

Catalogue line

“A lip stain that will not rub off, even on a mug. 24 hours of wear”

What the listing said

“Keeps temperature for up to 24 h”

A number of hours was taken for heat retention. The listing did not crash, did not turn red and looked perfectly normal — it simply described a lip product as a vacuum flask. In a thousand-item catalogue this goes live and is found by the buyer.

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Error two: a face cream became a leather item

Catalogue line

“Skin like a filter. Skin as if filtered” (a skincare set)

What the listing said

“Material: leather”

Human skin taken for the product material. Same class of defect: quiet, plausible and completely wrong.

Why this matters more than it looks

Marketplaces penalise the seller for inaccurate specs, not whoever wrote the text. Neither of these two errors crashed or raised a warning — they cannot be caught by checking that it works. They are found only by a run on real data and a human who reads the result.

What we did about it

Both are fixed by rules and locked down by tests we deliberately break — to make sure they actually catch something rather than merely being green:

hours count as heat retention only if temperature is mentioned in words;
material means genuine leather — not every mention of skin.

After the fixes, the same catalogue: 20 listings out of 20 with no findings.

An honest limit

17 of the 20 lines in that catalogue were marketing copy with no specs at all (“smoothies anywhere”, “clean in 5 minutes”). For such lines our tool returns an empty listing, not an invented one. That is the correct behaviour, and it means: a pilot pays off where you have an export with specifications, not only ad copy. We say this before payment, not on day seven.

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