How do I deal with false positives from the reviewer?

Treat the reviewer's report as a draft, not a verdict. Three calibration moves. (1) Add a ## Project conventions section to your CLAUDE.md listing exceptions ("ObjectManager is allowed in Test/Unit, mocks need it"). (2) For repeated false positives, add an .claude/agents/code-reviewer.md override that explicitly mentions the convention. (3) If a finding is genuinely wrong, reply in-thread, the reviewer will adjust within the session. After two weeks of use, the false-positive rate is < 5%; on day 1 it'll be 20%. Patience pays.