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Solid Principles

Solid Principles is an agent skill (a SKILL.md file) from decebals/claude-code-java. SOLID principles checklist with Java examples. It works with Claude Code and has 760 GitHub stars. Install it by copying the skill folder into your agent's skills directory. The repository is released under the MIT license.

github.com/decebals/claude-code-java/skills/solid-principles (opens in a new tab)

Data as of from the GitHub API; description from the skill's SKILL.md. Report an error

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Add this skill

Claude

Claude Code loads skills from ~/.claude/skills/ (all projects) or .claude/skills/ (one project):

git clone --depth 1 https://github.com/decebals/claude-code-java.git
cp -r claude-code-java/skills/solid-principles ~/.claude/skills/solid-principles   # personal, or .claude/skills in a project

In the Claude apps, zip the solid-principles folder and upload it under Customize > Skills > + > Upload a skill (code execution must be on).

ChatGPT / Codex

Codex reads skills from .agents/skills/ in a repo or ~/.agents/skills/ for every project:

git clone --depth 1 https://github.com/decebals/claude-code-java.git
cp -r claude-code-java/skills/solid-principles .agents/skills/solid-principles   # repo; ~/.agents/skills for all projects

Standalone skills also load in the ChatGPT desktop app.

Cursor

Cursor loads skills from .cursor/skills/ (or ~/.cursor/skills/) and also reads .claude/skills/:

git clone --depth 1 https://github.com/decebals/claude-code-java.git
cp -r claude-code-java/skills/solid-principles .cursor/skills/solid-principles   # project; ~/.cursor/skills for all projects

Source (checked Oct 7, 2026): code.claude.com/docs/en/skills (opens in a new tab), support.claude.com/en/articles/12512180-using-skills-in-claude (opens in a new tab), learn.chatgpt.com/docs/build-skills (opens in a new tab), cursor.com/docs/context/skills (opens in a new tab)

What this skill does

SOLID principles checklist with Java examples. Use when a class has too many responsibilities, an abstraction leaks, or a dependency points the wrong way, and when the user asks about Single Responsibility, Open/Closed, Liskov, Interface Segregation or Dependency Inversion. For naming, duplication and method length, use clean-code instead. Problems: - Validation changes? Modify UserService - Email template changes? Modify UserService - Audit format changes?

When it triggers

  • Use when a class has too many responsibilities, an abstraction leaks, or a dependency points the wrong way, and when the user asks about Single Responsibility, Open/Closed, Liskov, Interface Segregation or Dependency Inversion.

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FAQ

Solid Principles FAQ

Still curious? Email info@appsgit.com.

How do I install the Solid Principles skill?

Copy the solid-principles folder (the one containing SKILL.md) into ~/.claude/skills/ for Claude Code, .agents/skills/ for Codex or .cursor/skills/ for Cursor. The agent picks it up automatically when a task matches its description.

Is the Solid Principles skill free?

Yes. The repository is open source under the MIT license.

Is Solid Principles maintained?

The repository's most recent commit was on Sep 6, 2026. Its latest release is v1.0.0. appsgit only lists skills from repositories with a commit in the last six months.