plugin-dev-marketplace

Plugin Development Toolkit

A comprehensive toolkit for developing Claude Code plugins with expert guidance on hooks, MCP integration, plugin structure, and marketplace publishing.

Table of Contents

• Overview
• Prerequisites
• Installation
• Quick Start
• Skills
• Guided Workflows
• Validation Agents
• Utility Scripts
• Development Workflow
• Use Cases
• Best Practices
• FAQ
• Contributing
• Getting Help
• Attribution
• Changelog
• License

Overview

The plugin-dev toolkit provides 10 specialized skills, 3 validation agents, and 4 slash commands to help you build high-quality Claude Code plugins:

• Skills provide domain expertise loaded on-demand via trigger phrases
• Agents automate validation and generation tasks
• Workflows guide you through complete plugin or marketplace creation

Each component follows progressive disclosure: lean core documentation with detailed references and working examples available when needed.

Prerequisites

Required

• Claude Code CLI installed and configured
• Git (for version control and marketplace publishing)

For Utility Scripts

The plugin includes utility scripts for validation and testing. These require:

Tool	Version	Purpose
bash	3.2+	Shell scripting (macOS default works)
jq	1.6+	JSON parsing and validation
grep	-	Pattern matching (with -E support)
sed	-	Stream editing (GNU or BSD)

Check your environment:

bash --version | head -1
jq --version
grep --version 2>&1 | head -1

Note: jq may need to be installed. macOS: brew install jq, Linux: apt install jq

Installation

Add this marketplace and install the plugin:

/plugin marketplace add sjnims/plugin-dev
/plugin install plugin-dev@sjnims/plugin-dev

Or for development, use directly:

claude --plugin-dir /path/to/plugin-dev/plugins/plugin-dev

Quick Start

New to plugin development? Start with the guided entry point:

/plugin-dev:start

This will help you choose between creating a plugin (most users) or a marketplace (for distributing multiple plugins).

Learning by Asking

You can also learn progressively by asking questions. Skills load automatically:

1. Plan your plugin structure:

   • Ask: "What's the best directory structure for a plugin with commands and MCP integration?"
   • The plugin-structure skill will guide you

2. Add MCP integration (if needed):

   • Ask: "How do I add an MCP server for database access?"
   • The mcp-integration skill provides examples and patterns

3. Implement hooks (if needed):

   • Ask: "Create a PreToolUse hook that validates file writes"
   • The hook-development skill gives working examples and utilities

Skills

Skills load automatically when you ask relevant questions. Each skill includes core documentation, reference guides, working examples, and utility scripts.