solid-principles

Apply SOLID design principles to object-oriented codebases.

Updated Mar 28, 2026

Search Tags:#architecture #maintainability #refactor #principles #oop #solid #design-patterns

Ready to run

npx skills add https://github.com/mechemsi/claude-template --skill solid-principles-mechemsi

💬 Prompt for ChatGPT / Claude Chat▼

Please help me install this Agent Skill.
Skill: solid-principles
Source: https://github.com/mechemsi/claude-template/tree/main/skills/solid-principles
Command: npx skills add https://github.com/mechemsi/claude-template --skill solid-principles-mechemsi

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Use SOLID design principles to guide the structure of your codebase—when a class grows unwieldy, when inheritance becomes brittle, when interfaces force clients to depend on unused methods, or when high-level modules depend on concrete low-level implementations.

Core Features & Use Cases

Provides a clear checklist of the five SOLID principles: SRP, OCP, LSP, ISP, DIP, with guidance on when each applies.
Helps identify and reduce coupling and improve interface design, making code easier to test, extend, and maintain.
Use cases include refactoring large classes, evolving APIs, and designing modular architectures that support substitution and easy maintenance.

Quick Start

Audit a module and refactor it to ensure one responsibility per unit, open for extension but closed for modification, correct substitutability, small interfaces, and dependency inversion.

Frequently Asked Questions about solid-principles

High-intent search queries and answers about installing and using this skill.

FAQPage Schema

How do I refactor a large class to follow SOLID principles?▼

To refactor a large class for SOLID principles, audit the module to enforce one responsibility per unit, open/closed extension, correct substitutability, small interfaces, and dependency inversion, resulting in reduced coupling and improved maintainability.

What is the Liskov Substitution Principle and when does it apply to inheritance hierarchies?▼

The Liskov Substitution Principle enforces correct substitutability within inheritance hierarchies, ensuring derived classes replace base classes without breaking behavior, crucial when evolving object-oriented class designs and service modules.

Can I use this SOLID guidance for any object-oriented programming language?▼

Yes, this guidance applies to class design, service modules, and inheritance hierarchies across any object-oriented language where maintainability and substitutability matter, without requiring specific framework dependencies or environments.

How do I fix interfaces that force clients to depend on unused methods?▼

Fixing interfaces with unused methods requires applying the Interface Segregation Principle, which guides splitting large interfaces into smaller, client-specific ones to improve interface design and make code easier to test and maintain.

Why does high-level module dependency on concrete implementations make code hard to maintain?▼

High-level modules depending on concrete low-level implementations create tight coupling and brittle code. Applying the Dependency Inversion Principle resolves this by guiding modules to depend on abstractions, making code easier to extend and maintain.