solid-principles SKILL.md skillA
solid-principles from decebals/claude-code-java is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add decebals/claude-code-java/solid-principles@git:20260828.d70ab4fPins git:20260828.d70ab4f in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- decebals/claude-code-java
- Path
skills/solid-principles/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260828.d70ab4f, committed Aug 28, 2026
- First version recorded
- Aug 28, 2026
- Size
- 16,972 bytes
- Repository stars
- 759
- License
- MIT
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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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)
> "A class should have only one reason to change."
### Violation
```java
// ❌ BAD: UserService does too much
public class UserService {
public User createUser(String name, String email) {
// validation logic
if (email == null || !email.contains("@")) {
throw new IllegalArgumentException("Invalid email");
}
// persistence logic
…Read the whole file at its exact version.
How to install
mdr add decebals/claude-code-java/solid-principles@sha256:078fe811802f8cd3The line at the top of this page pins the label git:20260828.d70ab4f, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_7cl3sjxgygtuk6se)
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Versions
The registry has recorded 2 versions of this file, all committed on Aug 28, 2026.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260828.d70ab4f latest | 2026-08-28 | d70ab4f | 16,972 B | A | view · diff |
| git:20260828.702770a | 2026-08-28 | 702770a | 16,839 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (16972 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
decebals/claude-code-java · 759 stars · license MIT · pushed 2026-09-06 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_7cl3sjxgygtuk6se GET https://markdownregistry.com/api/v1/resolve?ref=decebals/claude-code-java/solid-principles GET https://markdownregistry.com/api/v1/blob/078fe811802f8cd3dcc91eed18c17f901087c07c5778a15e033d1b421ebdc8a4
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Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
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