What problem does it solve? Codebases accumulate unnecessary complexity: reinvented standard library functions, speculative abstractions, unused dependencies, and dead flexibility. This Skill performs a focused review pass that hunts only over-engineering, telling you exactly what to cut and what replaces it. ## Core Features & Use Cases - Complexity-Only Review: Flags dead code, hand-rolled stdlib equivalents, unneeded dependencies, and speculative abstractions using five tags: delete, stdlib, native, yagni, shrink. - One-Line Findings: Each finding is a single line with location, what to cut, and its replacement, ending with a net line-reduction score. - Use Case: After a large feature branch, ask for an over-engineering review of the diff. You get findings like "L4: native: moment.js imported for one format call. Intl.DateTimeFormat, 0 deps." plus a summary like "net: -120 lines possible." ## Quick Start Review this diff for over-engineering and tell me what can be deleted or replaced with standard library equivalents.