Overview

Specialized agents for developing, testing, and maintaining Claude Code plugins with quality enforcement hooks.

Overview

This plugin provides tools and best practices for creating high-quality Claude Code plugins. It includes comprehensive guidance on plugin architecture, agent/skill/hook development, validation workflows, and marketplace integration.

Agents

plugin-developer

The plugin-developer agent specializes in developing, maintaining, and improving Claude Code plugins.

Use when:

• Creating new Claude Code plugins
• Adding features to existing plugins
• Fixing plugin issues or bugs
• Improving plugin documentation
• Validating plugin structure and quality
• Integrating plugins with the marketplace

Capabilities:

• Plugin architecture and structure guidance
• Agent, skill, and hook development
• Frontmatter validation and best practices
• Quality enforcement (claude plugin validate, markdownlint)
• Testing and validation workflows
• Marketplace integration support
• Documentation standards

Quality Enforcement Hooks

This plugin includes automatic quality enforcement hooks that run before completion:

ensure-plugin-quality

Runs before main agent completion to ensure:

• claude plugin validate passes (0 errors, 0 warnings)
• markdownlint validation passes with auto-fix
• All quality checks are satisfied before work is marked complete

ensure-subagent-plugin-quality

Runs before subagent completion with the same quality checks as the main hook.

CRITICAL: These hooks will prevent completion if validation fails. All errors must be fixed before work can be marked as done.

Usage

Creating a New Plugin

# Use the plugin-developer agent
@plugin-developer Create a new plugin called "my-plugin"

The agent will guide you through:

1. Setting up the directory structure
2. Creating plugin.json with proper metadata
3. Developing agents, skills, or hooks
4. Writing comprehensive documentation
5. Running validation checks
6. Registering in the marketplace

Improving Existing Plugins

# Use the agent to enhance a plugin
@plugin-developer Add a new agent to the "my-plugin" plugin for feature X

Validating Plugin Quality

# Run quality checks manually
@plugin-developer Validate the plugin structure and run all linters

Quality Standards

All plugins developed with this agent must meet these standards:

Claude Plugin Validation

Run claude plugin validate <path> to check:

# Validate current directory
claude plugin validate .

# Validate a specific plugin
claude plugin validate /path/to/plugin

Checks:

• Valid YAML frontmatter in all agents/skills
• All required frontmatter fields present
• Proper JSON syntax in configuration files
• Hook configurations match implementation files

Markdownlint Validation

• All markdown files follow linting rules
• Consistent formatting and structure
• Proper heading hierarchy
• No trailing whitespace or broken links

Documentation Standards

• Comprehensive README.md
• Clear agent descriptions with use cases
• Examples and usage guidance
• Proper version management

Plugin Structure

A well-structured plugin created with this agent includes:

plugin-name/
├── .claude-plugin/
│   └── plugin.json          # Plugin metadata
├── agents/                  # Specialized agents
│   └── agent-name.md
├── skills/                  # Reusable skills (optional)
│   └── skill-name.md
├── hooks/                   # Lifecycle hooks (optional)
│   ├── hooks.json
│   └── hook-name.md
└── README.md               # Documentation

Best Practices

The plugin-developer agent enforces these best practices:

• Single Responsibility: Each agent/skill does one thing well
• Clear Documentation: Every component is well-documented
• Quality Validation: All code passes linting checks
• Consistent Naming: Kebab-case for all identifiers
• Proper Frontmatter: Valid YAML with all required fields
• Comprehensive Testing: Manual testing before release
• Semantic Versioning: Proper version management

Examples

Creating a Plugin for TDD

@plugin-developer Create a plugin for Test-Driven Development with an \
agent that guides TDD workflow

Adding Quality Hooks

@plugin-developer Add quality enforcement hooks to ensure tests pass before completion

Documenting an Existing Plugin

@plugin-developer Improve the README and documentation for the "my-plugin" plugin

Development Workflow

1. Plan: Define plugin scope, agents, and features
2. Create: Set up structure and write components
3. Document: Write comprehensive README and descriptions
4. Validate: Run claude plugin validate and markdownlint
5. Test: Manually verify all functionality
6. Register: Add to marketplace.json
7. Iterate: Improve based on usage and feedback

Resources

• Claude Code documentation
• claude plugin validate - Built-in plugin structure validation
• markdownlint - Markdown linting
• YAML specification for frontmatter
• Semantic versioning guidelines