How many trades does a health check need?

Three to run at all, and twenty before it stops calling itself provisional.

There are two thresholds and they do different jobs.

Below three trades on the setup it will not run. It says so, and names how many you actually have. There is nothing to compare rules against.

Between three and nineteen it runs but marks the result provisional, and is instructed to read it as a provisional pass rather than a verdict. This is deliberate: gating it at twenty would switch off the rule-following feedback for exactly the period when you most need it, which is when the setup is new and the habits are forming.

At twenty trades — the same threshold the setup card uses before it shows a verdict — it becomes the full review.