Building a Claude Code Plugin Marketplace

Overview

This document describes how to register, install, and use the Claude Code plugin marketplace.

Plugins are shared through the seungah-claude-plugins marketplace. It currently consists of the following four team-specific plugins.

Marketplace version: 1.4.0 · Repository: https://github.com/seungahhong/seungah-claude-plugins

Installation

Installation supports three methods. For sharing within a team, Method A (install after registering the marketplace) is recommended.

Method A - Install after registering the marketplace (recommended)

This proceeds in two steps.

Step 1. Add the marketplace

Register the marketplace registry in your local environment. This step only registers the list of available plugins; it does not activate any skills.

# seugnah-claude-plugins
/plugin marketplace add https://github.com/seungahhong/seungah-claude-plugins

(Note) If the marketplace cannot be added because the github clone fails,

gh auth login

Step 2. Install a plugin

Select and install the plugin you want from the registered marketplace.

# Plugins in seugnah-claude-plugins
/plugin install frontend-harness@seungah-claude-plugins

/plugin install frontend-harness

You can choose from the following three installation scopes.

Method B - Install directly from GitHub

This method adds the marketplace directly from the GitHub repository via the CLI.

claude plugin add seungahhong/seungah-claude-plugins

Method C - Install from a local path

This method installs by specifying the path of a repository cloned locally. It is useful during development and debugging.

claude --plugin-dir /path/to/frontend-harness

Marketplace Registration Screens

Below is the process of registering the seungah-claude-plugins marketplace and installing plugins.

Step 1. Enter the /plugin command

Launch Claude Code and enter the /plugin command.

/plugin command autocomplete screen

Step 2. Add Marketplace - Enter the marketplace URL

Select Add Marketplace and enter the marketplace repository URL.

seungah-claude-plugins URL input screen

Step 3. Discover - Check the list of installable plugins

Check the list of installable plugins in the Discover tab.

• Discover tab plugin list
• Press space to select → press enter to proceed with installation

Step 4. Plugin Details - Plugin details and scope selection

When you select a plugin to install, its details are displayed. Choose the installation scope (user/project/local scope).

frontend-harness Plugin Details screen

Step 5. Confirm installation - settings.local.json

Once installation is complete, the enabledPlugins setting is added to .claude/settings.local.json.

settings.local.json confirmation screen

Step 6. Run a skill

Run a skill from the installed plugin using the /skill-name format.

• /a11y skill execution screen
• If it does not appear, run /reload-plugins and retry the /(slash) command

Plugin Components

Each team plugin is used by combining the components below.

There is no need to modify marketplace.json when adding components. Since paths are declared in plugin.json, you only need to add files to the corresponding directory.

Skill Configuration

frontend-harness plugin (12 skills)

Commands (7)

Hooks (1)

harness-generator plugin (1 skill)

git-harness plugin (2 skills)

meta-harness plugin (4 skills + 4 agents)

Four agents (all model: opus): trace-capturer (raw trace normalization) · failure-diagnostician (parallel root cause diagnosis per defect) · pareto-refiner (patch generation) · experience-historian (experience-store curation).

Using the GitHub Repository

Repository: https://github.com/seungahhong/seungah-claude-plugins

How users use it

1. Register the marketplace — In Claude Code, run /plugin marketplace add https://github.com/seungahhong/seungah-claude-plugins (or the CLI claude plugin add seungahhong/seungah-claude-plugins)
2. Install plugins — Install only the plugins you want, such as /plugin install frontend-harness@seungah-claude-plugins (choose user / project / local scope)
3. Run skills — After installation, invoke them via slash commands like /planner, /review, /commit, or trigger them with natural language. If the list does not appear, retry after running /reload-plugins
4. Update — When changes are reflected in the repository, update to the latest with /plugin marketplace update seungah-claude-plugins

Contributing and local development

git clone https://github.com/seungahhong/seungah-claude-plugins.git
cd seungah-claude-plugins
# Load directly from a local path for debugging
claude --plugin-dir ./plugins/frontend-harness

For components (skills / commands / agents / hooks), you only need to add files to each plugin directory; there is no need to modify marketplace.json (paths are declared in plugin.json).

Usage Examples

After installation is complete, you can trigger skills with natural language or slash commands in the Claude Code chat window.

Skill-by-skill execution flow

/grill-me            // 1. 요구사항 명확화
/planner             // 2. 구현 계획(PRD)
/architecture        // 3. 기술 아키텍처 설계
/critic              // 4. 설계 검증·리스크 분석
/tdd                 // 5. 테스트 주도 구현
/a11y /semantic-html /seo-geo-optimizer   // 6. 품질·접근성·SEO 점검
/review              // 7. 통합 리뷰(5개 관점 중 선택 병렬 + 재리뷰 루프)
/verify              // 8. 동작·빌드 검증(E2E + tsc + build)
/commit              // 9. 커밋 메시지 작성(git-harness)

Full automation with the orchestrator

/orchestrator        // research → prd → develop → review → verify 전체 파이프라인 자동 실행

Meta workflow — handling the harness itself

/harness-generator   // 신규 도메인용 하네스(에이전트+스킬+오케스트레이터) 한 묶음 생성
/meta-harness        // 사용 중인 하네스를 full-trace로 캡처·진단·개선(사용자 승인 게이트)

Natural language trigger examples

• "Check this component's web accessibility" → /a11y
• "Run a security audit and performance check before deployment" → /review (selecting security-audit + lighthouse)
• "Commit these changes in Korean" → /commit
• "Develop the payment feature from start to finish" → /orchestrator