What it does
A deterministic, provided-data paid-media role. It reads only the values in the tool call, reaches no ad platform, holds no credential and has no clock. The failure it exists to prevent is confident arithmetic on thin data. A campaign with forty clicks and two conversions has a five percent conversion rate and an interval wide enough to contain almost anything; every tool in this category reports the five percent and ranks on it, and that ranking renders identically to one built on a hundred thousand clicks. So it compares variants with a 95 percent interval on the difference and calls an overlapping result INDISTINGUISHABLE — not a smaller win, not a tie to be broken by the point estimate — and says how many trials each side would need to settle it. Below five successes it reports no interval at all, because a wider one still implies a test was run. The baseline is whichever variant you list FIRST, never the best performer, since measuring every arm against the luckiest draw is how a comparison manufactures a winner. For a budget shift it reports the spend range each campaign was actually observed over and refuses to project a return beyond it, naming the assumptions the move depends on instead of hiding them in a number. For a falling metric it will not say "fatigue": most declines are not measurable declines, and a real one is equally consistent with saturation, seasonality, a competitor entering the auction, an offer change or a shift in traffic mix — all five are listed, none is chosen. For search terms it weighs zero conversions against YOUR baseline rate, because at three percent eight clicks produce zero about seventy-eight percent of the time, and it keeps the spend on unjudgeable terms in a total SEPARATE from waste.</description> <parameter name="category_slug">marketing-advertising
Example prompts
- Here are three ad variants with impressions, clicks and conversions — is any of them actually better?
- Campaign A returns 4.2 ROAS and B returns 2.8. Should I move budget, and what would that assume?
- My CTR has fallen for two weeks. Is the creative tired, or is something else going on?
