Solid Principles

by decebals

Solid Principles is a Quality skill for Claude Code, published by decebals in claude-code-java.

714 stars142 forkson decebals/claude-code-javaAdded 2026/08/23+1% in starsRepository updated 2026/02/08

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ai-assisted-developmentclaude-codeclaude-code-skillsdeveloper-toolsjava

Install in seconds

Install Solid Principles

Copy Solid Principles into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.

terminal

npx degit https://github.com/decebals/claude-code-java/tree/main/.claude/skills/solid-principles ~/.claude/skills/solid-principles

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/decebals/claude-code-java.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file: .claude/skills/solid-principles/SKILL.md in decebals/claude-code-java
Installs to: ~/.claude/skills/solid-principles
Collection: One of 18 skills cataloged from this repository
Category: Quality — 1354 skills

What Solid Principles does

Solid Principles reviews Java classes against SRP, OCP, LSP, ISP, and DIP. Use it when refactoring code or checking whether a class has too many responsibilities or too many reasons to change.

Solid Principles is cataloged under Quality on DirSkills. Solid Principles comes from a repository tagged ai-assisted-development, claude-code, claude-code-skills, developer-tools and java.

Documentation

README

Excerpt

SOLID Principles Skill

Review and apply SOLID principles in Java code.

When to Use

User says "check SOLID" / "SOLID review" / "is this class doing too much?"
Reviewing class design
Refactoring large classes
Code review focusing on design

Quick Reference

Letter	Principle	One-liner
S	Single Responsibility	One class = one reason to change
O	Open/Closed	Open for extension, closed for modification
L	Liskov Substitution	Subtypes must be substitutable for base types
I	Interface Segregation	Many specific interfaces > one general interface
D	Dependency Inversion	Depend on abstractions, not concretions

S - Single Responsibility Principle (SRP)

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Solid Principles

What else does decebals publish alongside Solid Principles?
Solid Principles is one of 18 skills that DirSkills catalogs from decebals/claude-code-java, the repository it ships in. Its siblings there include API Contract Review, Architecture Review and Changelog Generator. Each one is a separate skill with its own page in this directory, installs the same way Solid Principles does, and is maintained by decebals in that same repository. The rest of the collection is listed on the decebals/claude-code-java page.
How does Solid Principles compare to other Quality skills?
Solid Principles ranks #1040 by stars among the 1354 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Solid Principles against them. Open each page to compare what they document and how they install.