What is 121-java-object-oriented-design?

A Java guidance add-on for object-oriented design, the approach of organizing software around objects that combine data with the operations that use it.

Use it to review classes and interfaces, apply common design principles, fix code smells, and improve inheritance, encapsulation, object creation, and method design.

It helps reduce tightly coupled classes, oversized classes, duplicated logic, and designs that are difficult to change or test.

121-java-object-oriented-design — Plugin for Claude Code by jabrena: A Java guidance add-on for object-oriented design, the approach…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Claude Code

/plugin marketplace add jabrena/plinth

agentmods

npx agentmods add plugins/jabrena/plinth/121-java-object-oriented-design

Clone the repo

git clone --depth 1 https://github.com/jabrena/plinth

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/plugins/jabrena/plinth/121-java-object-oriented-design.svg)](https://agentmods.dev/plugins/jabrena/plinth/121-java-object-oriented-design)

Your own site

<a href="https://agentmods.dev/plugins/jabrena/plinth/121-java-object-oriented-design"><img src="https://agentmods.dev/badge/plugins/jabrena/plinth/121-java-object-oriented-design.svg" alt="Measured on agentmods" height="20"></a>

Per session not measured What this adds to a session before it is invoked.

When invoked not measured Not applicable: nothing here is loaded into a session.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Security

Grade A, and why

121-java-object-oriented-design scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude-plugin/marketplace.json#121-java-object-oriented-design · 6 lines

What it actually says

{
  "name": "121-java-object-oriented-design",
  "source": "./skills/121-java-object-oriented-design",
  "description": "Use when you need to review, improve, or refactor Java code for object-oriented design quality — including applying SOLID, DRY, and YAGNI principles, improving class and interface design, fixing OOP concept misuse (encapsulation, inheritance, polymorphism), identifying and resolving code smells (God Class, Feature Envy, Data Clumps), or improving object creation patterns, method design, and exception handling.",
  "version": "0.14.0-SNAPSHOT"
}

Files

What ships with it

1 file beside marketplace.json#121-java-object-oriented-design in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

marketplace.json 34 KB

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 6 lines scan A d17cd6f8c776

Subscribe to this mod's changes

121-java-object-oriented-design is a plugin published in the GitHub repository jabrena/plinth (435 stars, last pushed today), licensed Apache-2.0. Its token cost is not measured: this kind of file is read by the harness, not the model. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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121-java-object-oriented-design

Getting it into your agent

Wrote this? Show the measurements

Grade A, and why

Nothing flagged

What it actually says

What ships with it

What this file has done since we first saw it

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