solid

Apply SOLID design principles to codebases during reviews and refactoring.

Updated Feb 9, 2026
One-click install
npx skills add https://github.com/Xza85hrf/claude-code-agent-kit --skill solid-xza85hrf
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: solid
Source: https://github.com/Xza85hrf/claude-code-agent-kit/tree/main/.claude/skills/engineering/solid
Command: npx skills add https://github.com/Xza85hrf/claude-code-agent-kit --skill solid-xza85hrf

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

SOLID principles help software teams structure code to reduce coupling, improve testability, and enable safer evolution of complex systems.

Core Features & Use Cases

  • Single Responsibility Principle (SRP): ensures a class or module has a single reason to change.
  • Open/Closed Principle (OCP) & DIP: promotes extension via new abstractions rather than editing existing code, with dependencies inverted toward interfaces.
  • Liskov Substitution (LSP) & ISP: enables safe interchangeable components and client-focused interfaces.
  • Use Case: restructure a feature gate into dedicated services and interfaces, then verify behavior with targeted unit tests.

Quick Start

Refactor a small module to satisfy SRP and DIP, and write tests to prove correct behavior.

Frequently Asked Questions about solid

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

FAQPage Schema
How do I apply SOLID design principles when refactoring existing backend code?

To apply SOLID design principles during refactoring, restructure modules to satisfy the Single Responsibility and Dependency Inversion principles, then verify correct behavior by writing targeted unit tests.

What is the best way to enforce maintainability and reduce coupling in software architecture?

Enforcing maintainability and reducing coupling requires applying SOLID principles like Open/Closed and Liskov Substitution to promote extension via new abstractions rather than editing existing code.

How does the Dependency Inversion Principle improve testability in backend services?

The Dependency Inversion Principle improves testability by inverting dependencies toward interfaces, which enables safe interchangeable components and easier mocking during targeted unit tests.

Can I use SOLID principles to evaluate code quality during architectural code reviews?

Yes, SOLID principles provide concrete evaluation criteria and anti-patterns to assess software quality, making them highly effective for architectural decisions and code reviews in backend services.

What are the limitations of SOLID principles for software design in complex systems?

SOLID principles do not provide explicit architectural templates but rather evaluation criteria for software design; over-applying them can lead to unnecessary abstractions if not balanced with practical module boundaries.

When do I need to split interfaces according to the Interface Segregation Principle?

You need to split interfaces according to the Interface Segregation Principle when clients are forced to depend on methods they do not use, ensuring components remain safe and client-focused.