Define an observation before collecting it
A repeatable observation records a query, surface, region, time and product/merchant identity. Decide whether you are measuring brand mentions, product tiles, price accuracy, merchant links or purchase-path availability. Those measures answer different questions and should not be compressed into one unexplained score.
Choose tools by the artifact you need
A visibility product can help collect and compare results, but scope matters. Profound documents a current ChatGPT Shopping focus; other vendors describe broader optimization workflows. Ask which surfaces, regions and query sets are included in the quoted plan. Keep vendor performance claims separate from your own results.
Read movement carefully
A changed result can reflect a market change, a different prompt, a surface update or a better measurement method. Preserve the original evidence and classify the change. A one-time public readiness scan is useful groundwork, but it cannot establish recurring visibility or predict revenue.