Invert your code-review prompt on Opus 5: "only report high-severity issues" now makes it report less, not better

Claude Platform Docs·high signal

Anthropic warns that Opus 5 follows review-scoping instructions literally — if your prompt says "only report high-severity issues" or "be conservative," the model reports fewer findings, including real ones. The documented fix is to ask it to report everything and filter severity in a separate pass. Anthropic also notes review accuracy "holds at lower effort settings," which enables a concrete two-tier pattern: a cheap `low`/`medium` effort pass at commit time, a thorough pass later, with the severity filter as its own downstream step rather than a prompt constraint.