Metaplugin Creator

Plugin Creator

Quick Start

Step 1: Create the plugin

my-plugin/
├── .claude-plugin/
│   └── plugin.json
└── commands/
    └── hello.md

// .claude-plugin/plugin.json
{
  "name": "my-plugin",
  "version": "1.0.0",
  "description": "My first Claude Code plugin"
}

## <!-- commands/hello.md -->

## description: Say hello

Say "Hello from my-plugin!" to the user.

Step 2: Validate (required)

Always run validation after creating or modifying a plugin:

uv run .claude/skills/meta-plugin-creator/scripts/validate-plugin.py path/to/my-plugin

Fix any errors before publishing.

Plugin Manifest

Required Fields

{
  "name": "plugin-name"
}

The name must be kebab-case with no spaces.

Complete Schema

{
  "name": "my-plugin",
  "version": "1.2.0",
  "description": "Brief plugin description",
  "author": {
    "name": "Author Name",
    "email": "author@example.com",
    "url": "https://github.com/author"
  },
  "homepage": "https://docs.example.com/plugin",
  "repository": "https://github.com/author/plugin",
  "license": "MIT",
  "keywords": ["keyword1", "keyword2"],
  "commands": "./custom/commands/",
  "agents": "./custom/agents/",
  "skills": "./custom/skills/",
  "hooks": "./config/hooks.json",
  "mcpServers": "./mcp-config.json",
  "lspServers": "./.lsp.json",
  "outputStyles": "./styles/"
}

Field Reference

Component Paths

Custom paths supplement default directories—they don't replace them.

Directory Structure

my-plugin/
├── .claude-plugin/           # Metadata (ONLY plugin.json here)
│   └── plugin.json          # Required manifest
├── commands/                 # Slash commands (.md files)
│   ├── deploy.md
│   └── status.md
├── agents/                   # Subagents (.md files)
│   ├── reviewer.md
│   └── tester.md
├── skills/                   # Agent skills (directories)
│   └── code-review/
│       ├── SKILL.md
│       └── scripts/
├── hooks/                    # Event hooks
│   └── hooks.json
├── .mcp.json                # MCP server config
├── .lsp.json                # LSP server config
├── scripts/                 # Utility scripts
│   └── format.sh
├── LICENSE
└── CHANGELOG.md

Critical: Components go at plugin root, NOT inside .claude-plugin/. Only plugin.json belongs in .claude-plugin/.

Plugin Components

Commands

Location: commands/*.md

---
description: Deploy to production
argument-hint: [environment]
---

Deploy the application to $ARGUMENTS environment.

Commands are namespaced: /plugin-name:command-name

Agents

Location: agents/*.md

---
name: security-reviewer
description: Review code for security vulnerabilities. Use proactively after auth changes.
tools: Read, Grep, Glob
model: haiku
---

# Security Reviewer

You review code for security issues...

Skills

Location: skills/*/SKILL.md

skills/
└── pdf-processor/
    ├── SKILL.md
    ├── reference.md
    └── scripts/

Skills are auto-discovered based on context.

Hooks

Location: hooks/hooks.json or inline in plugin.json

{
  "hooks": {
    "PostToolUse": [
      {
        "matcher": "Write|Edit",
        "hooks": [
          {
            "type": "command",
            "command": "${CLAUDE_PLUGIN_ROOT}/scripts/format.sh"
          }
        ]
      }
    ]
  }
}

MCP Servers

Location: .mcp.json or inline in plugin.json

{
  "mcpServers": {
    "my-server": {
      "command": "${CLAUDE_PLUGIN_ROOT}/servers/db-server",
      "args": ["--config", "${CLAUDE_PLUGIN_ROOT}/config.json"],
      "env": {
        "DB_PATH": "${CLAUDE_PLUGIN_ROOT}/data"
      }
    }
  }
}

LSP Servers

Location: .lsp.json or inline in plugin.json

{
  "go": {
    "command": "gopls",
    "args": ["serve"],
    "extensionToLanguage": {
      ".go": "go"
    }
  }
}

Required: command, extensionToLanguage

Environment Variables

Always use ${CLAUDE_PLUGIN_ROOT} for plugin file paths.

Installation Scopes

Common Mistakes

Validation

Run the validator to check plugin structure:

uv run .claude/skills/meta-plugin-creator/scripts/validate-plugin.py ./my-plugin

Checklist

• .claude-plugin/plugin.json exists with name field
• Components at plugin root (not in .claude-plugin/)
• All paths relative, starting with ./
• Scripts are executable
• Uses ${CLAUDE_PLUGIN_ROOT} for paths
• Version follows semver (MAJOR.MINOR.PATCH)

Delegation

• After creating/modifying plugins: Run uv run .claude/skills/meta-plugin-creator/scripts/validate-plugin.py <plugin-dir>
• Pattern discovery: For existing plugin patterns, use Explore agent
• Component creation: Use meta-skill-creator, meta-command-creator, meta-agent-creator, meta-hook-creator

Additional Resources

• For CLI commands, marketplace, debugging: reference.md

References

• Official Plugins Reference: code.claude.com/docs/en/plugins-reference
• Discover Plugins: code.claude.com/docs/en/discover-plugins
• Plugin Marketplaces: code.claude.com/docs/en/plugin-marketplaces

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