Jimmc414 Claude Code Plugin Marketplace Plugin Publishing

Plugin Publishing Knowledge

This skill provides knowledge for extracting locally installed Claude Code components and packaging them into shareable plugins for marketplace submission.

Claude Code Installation Paths

Default Locations

Project-Level Locations

Projects may have local overrides in:

• .claude/skills/
• .claude/agents/
• .claude/commands/
• .claude/settings.json

Plugin Structure Requirements

A valid plugin MUST have:

<plugin-name>/
├── .claude-plugin/
│   └── plugin.json          # REQUIRED: Plugin manifest
├── README.md                 # REQUIRED: Documentation
└── [components...]           # At least one component

plugin.json Schema

{
  "name": "plugin-name",           // REQUIRED: lowercase, hyphens allowed
  "version": "1.0.0",              // REQUIRED: semver format
  "description": "What it does",   // REQUIRED: one-line description
  "author": {
    "name": "Author Name",         // REQUIRED
    "email": "optional@email.com"  // Optional
  },
  "homepage": "https://...",       // Optional: documentation URL
  "repository": "https://...",     // Optional: source repo
  "license": "MIT",                // Recommended
  "keywords": ["tag1", "tag2"],    // Recommended: for discovery
  "category": "development",       // One of: devops, development, security, testing, documentation, utilities
  "dependencies": {},              // Optional: other plugins required
  "commands": "./commands/",       // Path if plugin has commands
  "agents": "./agents/",           // Path if plugin has agents
  "skills": "./skills/",           // Path if plugin has skills
  "hooks": "./hooks/hooks.json",   // Path if plugin has hooks
  "mcpServers": "./.mcp.json"      // Path if plugin has MCP servers
}

Component Formats

Skill Format (SKILL.md)

---
name: skill-name
description: What it does. Use when [triggers]. Triggers: keyword1, keyword2.
allowed-tools: Read, Grep, Glob, Bash
---

# Skill Title

## Instructions
Step-by-step guide for Claude.

## Examples
Concrete usage examples.

Validation Rules:

• MUST have YAML frontmatter with name and description
• description SHOULD include trigger keywords
• allowed-tools restricts what tools skill can use

Agent Format (.md)

---
name: agent-name
description: What it does. Use for [use cases].
tools: Read, Grep, Glob, Bash, Edit, Write
model: inherit
---

# Agent Title

You are a specialized agent for [purpose].

## When Invoked
1. Step 1
2. Step 2

Validation Rules:

• MUST have YAML frontmatter with name and description
• tools lists allowed tool names
• model can be: inherit, sonnet, opus, haiku

Command Format (.md)

---
description: Brief description of what command does
argument-hint: [required-arg] [optional-arg]
allowed-tools: Bash, Read
---

# Command Name

## Arguments
- `$1` - First positional argument
- `$ARGUMENTS` - All arguments as string

## Instructions
What to do when user invokes this command.

Hooks Format (hooks.json)

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Bash|Write",
        "hooks": [{
          "type": "command",
          "command": "${CLAUDE_PLUGIN_ROOT}/scripts/my-hook.sh",
          "timeout": 30
        }]
      }
    ]
  }
}

Hook Events:

• PreToolUse - Before tool execution
• PostToolUse - After tool execution
• UserPromptSubmit - When user submits prompt
• SessionStart - When session begins
• SessionEnd - When session ends

Marketplace Formats

marketplace.json

{
  "name": "marketplace-name",
  "version": "1.0.0",
  "metadata": {
    "description": "Marketplace description",
    "pluginRoot": "./plugins"
  },
  "owner": {
    "name": "Owner Name"
  },
  "plugins": ["plugin-a", "plugin-b"],
  "categories": ["devops", "development", "testing"]
}

catalog.json (Auto-Generated)

{
  "generated_at": "ISO8601 timestamp",
  "total_plugins": 5,
  "verified_plugins": 2,
  "plugins": [
    {
      "name": "plugin-name",
      "version": "1.0.0",
      "description": "...",
      "author": "Name",
      "category": "development",
      "keywords": [],
      "components": {
        "commands": 0,
        "agents": 1,
        "skills": 1,
        "hooks": false,
        "mcp_servers": 0
      },
      "verified": false,
      "install_command": "/plugin install name@marketplace"
    }
  ],
  "categories": {"development": 3, "testing": 2}
}

Category Selection Guide

Keyword Suggestions

Extract keywords from:

1. Component names (e.g., parallel-worker → parallel, worker)
2. Technologies mentioned (e.g., git, docker, pytest)
3. Actions performed (e.g., deploy, test, monitor)
4. Problem domain (e.g., orchestration, automation)

Related Component Detection

Skills and agents often work together. Detect relationships by:

1. Name patterns: foo-orchestrator + foo-worker + foo-monitor
2. Cross-references: Agent mentions "use foo-skill"
3. Shared keywords: Multiple components with same domain terms
4. Explicit dependencies: Frontmatter mentions other components

Validation Checklist

Before submission, verify:

• plugin.json has name, version, description, author
• All JSON files parse without errors
• Skills have frontmatter with name, description
• Agents have frontmatter with name, description
• Commands have frontmatter with description
• Hook scripts are executable (if any)
• README.md documents all components
• No hardcoded local paths or secrets
• No naming conflicts with existing plugins

Common Issues to Fix During Extraction

Marketplace Submission Workflow

1. Fork the marketplace repository
2. Clone your fork locally
3. Create plugin in plugins/<name>/ directory
4. Validate with python tools/validate.py <name>
5. Commit with descriptive message
6. Push to your fork
7. Create PR with plugin details

PR Description Template

## New Plugin: <name>

**Description:** <one-line description>

**Category:** <category>

**Components:**
- Skills: <count>
- Agents: <count>
- Commands: <count>
- Hooks: yes/no

**Use Cases:**
- <use case 1>
- <use case 2>

**Testing:**
- [ ] Validated with `python tools/validate.py`
- [ ] Tested locally
- [ ] README complete

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