engineering-principles

v0.1.0

Design, review, and improve code, tests, and documentation for long-term maintainability: tests express What, code expresses How, documentation carries Context, and the repository alone explains the current specification.

CodexClaude Code1 Skill

By 9uiLeLicense: MIT0 GitHub starsUpdated 1 hour ago

Directory evidence

Runtimes: Codex and Claude Code
Parsed components: 1 skill or MCP entry
Source updated: Oct 1, 2026
Manifest status: Canonical path parsed

The directory validates manifest shape and source location. It does not execute the plugin or provide a security endorsement. Review the indexing methodology →

Install engineering-principles for Codex and Claude Code

Installs for the current user

codex plugin marketplace add 9uiLe/plugins
codex plugin marketplace upgrade 9uile-plugins
codex plugin add engineering-principles@9uile-plugins

Paste and run these commands in a terminal with Codex. They add and refresh the 9uile-plugins catalog, then install this plugin.

Compatibility: the page URL and API slug “engineering-principles” remain stable.

Codex: engineering-principles@agent-plugin-marketplace → engineering-principles@9uile-plugins

The installer fetches third-party code from the source repository shown on this page. This directory validates manifest structure and source location, but does not perform a security audit; review the manifest, components, and source before installing.

Get the source manually

$ git clone https://github.com/9uiLe/plugins

Clone the source repository, then follow its setup instructions to add the plugin to a compatible client. The plugin root is plugins/engineering-principles/.

Plugin files

plugins/engineering-principles/

├── .codex-plugin/plugin.json
├── .claude-plugin/plugin.json
└── skills/maintainable-code/SKILL.md

Included Skills1

maintainable-codeskills/maintainable-code/SKILL.md

Design, review, or improve code, tests, and docs for long-term maintainability - tests express What, code expresses How, docs carry Context, and the repository alone explains the current spec. Use for implementing, refactoring, or reviewing code involving state modeling (Optional / Boolean / enum), test responsibility across unit / integration / UI, redundant comments or tests, separation of concerns, coupling, or code-test-doc coherence after a change (stale docs, conversation-only assumptions). Japanese triggers - maintainable-code を使って実装・レビュー・改善して, 責務分離を確認して, 状態の持ち方を見直して, Test の保証責任を整理して, 保守性の観点でレビューして, コードとドキュメントの整合性も確認して, 実装と設計ドキュメントの齟齬を直して, この変更を新規参加者が理解できる状態にして, 会話にしか残っていない前提がないか確認して, このリポジトリだけで現在仕様を理解できるようにして. Do not use for syntax questions, isolated bug explanations, formatting, proofreading, general doc writing, README wording-only edits, correctness-only diff review, or architecture explainer documents.

Plugin manifests2

plugins/engineering-principles/.codex-plugin/plugin.json

{
  "name": "engineering-principles",
  "version": "0.1.0",
  "description": "Design, review, and improve code, tests, and documentation for long-term maintainability: tests express What, code expresses How, documentation carries Context, and the repository alone explains the current specification.",
  "author": {
    "name": "9uiLe",
    "url": "https://github.com/9uiLe"
  },
  "homepage": "https://github.com/9uiLe/plugins/tree/master/plugins/engineering-principles",
  "repository": "https://github.com/9uiLe/plugins",
  "license": "MIT",
  "keywords": [
    "maintainability",
    "testing",
    "state-modeling",
    "code-review",
    "refactoring"
  ],
  "skills": "./skills/",
  "interface": {
    "displayName": "Engineering Principles",
    "shortDescription": "Keep code and tests easy to change safely and locally",
    "longDescription": "Design, review, and improve code, tests, and documentation for long-term maintainability: tests express What, code expresses How, documentation carries Context, and the repository alone explains the current specification.",
    "developerName": "9uiLe",
    "category": "Developer Tools",
    "capabilities": [
      "Read",
      "Write"
    ],
    "defaultPrompt": [
      "Review this change for maintainability: specification in tests, state modeling, test responsibility, and coupling"
    ]
  }
}

plugins/engineering-principles/.claude-plugin/plugin.json

{
  "name": "engineering-principles",
  "version": "0.1.0",
  "description": "Design, review, and improve code, tests, and documentation for long-term maintainability: tests express What, code expresses How, documentation carries Context, and the repository alone explains the current specification.",
  "author": {
    "name": "9uiLe",
    "url": "https://github.com/9uiLe"
  },
  "homepage": "https://github.com/9uiLe/plugins/tree/master/plugins/engineering-principles",
  "repository": "https://github.com/9uiLe/plugins",
  "license": "MIT",
  "keywords": [
    "maintainability",
    "testing",
    "state-modeling",
    "code-review",
    "refactoring"
  ]
}