What problem does it solve? Code changes touching security-sensitive surfaces, concurrency logic, or financial calculations often contain defect classes the original author cannot see, and self-review or same-family review cannot provide independent verification. This Skill sends a materialized diff to a caller-verified independent reviewer and returns structured, verified findings. ## Core Features & Use Cases - Lens-driven defect review: Prioritizes security vulnerabilities, edge cases, race conditions, resource hazards, performance bottlenecks, and architectural anti-patterns over style feedback. - Verifier independence contract: Records reviewer lineage before and after dispatch so independent governance evidence is only accepted when the reviewer differs from both the primary and artifact author. - Spec-fidelity and smell baselines: Compares the diff against a materialized spec and flags Fowler-named code smells as separately reported, non-blocking observations. - Use Case: Before merging a PR that changes authentication token refresh logic, materialize the diff with lockfile exclusions, dispatch it for independent review, and receive verified Critical/High findings grouped by file with a merge-readiness recommendation. ## Quick Start Have the reviewer review this diff for security flaws and concurrency hazards before I merge it.