sandi-metz-reviewer

Automated code reviews evaluate Ruby classes against Sandi Metz's design principles: classes ≤100 lines, methods ≤5 lines, parameters ≤4, instance variables ≤4. The review identifies violations of SRP, SOLID, Law of Demeter, and Tell Don't Ask, then provides actionable refactoring suggestions with severity levels.

Sandi Metz's four rules enforce class size (≤100 lines), method length (≤5 lines), parameter count (≤4), and instance variable limits (≤4). These rules improve code maintainability and reduce coupling in Ruby applications by constraining complexity at the class and method level.

Yes. Apply this to Ruby codebases and code-review requests to evaluate adherence to SOLID principles, SRP, Law of Demeter, and Tell Don't Ask patterns. Output includes per-principle findings, severity levels, and specific refactoring guidance for each violation detected.

SOLID and Demeter principle checks analyze your Ruby code for single responsibility violations, open/closed violations, and Liskov substitution issues. The review surfaces coupling points and suggests dependency restructuring to clarify class responsibilities and improve design.

Refactoring guidance is actionable and specific: it addresses code structure improvements, naming clarity, and dependency management. Each suggestion targets a specific principle violation detected in your Ruby code, helping you restructure classes and methods effectively.

This analyzes any Ruby codebase for design principle violations, including Rails applications. It evaluates raw Ruby code structure independently, applying Sandi Metz's rules to classes, methods, and dependencies regardless of framework context.