The single biggest risk with bulk description writing is a sparse input row. When a spreadsheet entry has a name and a price but no material, dimension, or ingredient listed, a model asked to write a full, appealing description will often invent a plausible-sounding detail to fill that gap — a fabric that sounds right, a dimension that reads believably — because a confident gap-fill looks more finished than an obvious hole. This is a known and real risk, not a rare glitch, and it scales with volume: forty thin rows means forty chances for an invented detail to slip into a live listing a customer might act on directly.
The practical response is checking each description against its actual source row before publishing, and this matters more, not less, at bulk scale — the temptation with a forty-item batch is to skim the output and trust that it's fine because it reads well, but reading well and being accurate to the supplied facts are different things a fast skim won't reliably distinguish. A spot-check habit — comparing at least the material, dimension, and price fields against the source row — catches this before a customer receives a sofa that doesn't match its listing.
Cost also scales linearly with row count here in a way worth planning for before running a very large batch — a job across several hundred items uses proportionally more processing than a single item, and estimating that before committing avoids an unpleasant surprise partway through a launch weekend.