Creating Plugins Skill | Agent Skills

Creating Plugins

Create Claude Code plugins that bundle multiple extension types for distribution via marketplaces.

Quick Reference

| Element | Requirement | |---------|-------------| | Manifest location | .claude-plugin/plugin.json | | Required field | name (kebab-case) | | Component dirs | At plugin root, NOT inside .claude-plugin/ | | Command naming | /plugin-name:command (namespaced) | | Testing | claude --plugin-dir ./my-plugin |

Plugin vs Standalone

Choose the right approach for your use case:

| Approach | Command Names | Best For | |----------|---------------|----------| | Standalone (.claude/) | /hello | Personal workflows, single project | | Plugin (.claude-plugin/plugin.json) | /plugin-name:hello | Sharing, distribution, reuse |

Use standalone when:

Customizing for a single project
Personal configuration (not shared)
Quick experiments before packaging

Use plugins when:

Sharing with team or community
Same functionality across multiple projects
Distributing through marketplace
Bundling multiple component types

Plugin Structure

my-plugin/
├── .claude-plugin/           # Metadata directory
│   └── plugin.json           # Required: plugin manifest
├── commands/                 # Slash commands (Markdown files)
│   ├── deploy.md
│   └── status.md
├── agents/                   # Subagent definitions
│   └── reviewer.md
├── skills/                   # Agent Skills
│   └── code-review/
│       └── SKILL.md
├── hooks/                    # Event handlers
│   └── hooks.json
├── .mcp.json                 # MCP server configurations
├── .lsp.json                 # LSP server configurations
├── scripts/                  # Hook and utility scripts
│   └── format.sh
└── README.md

Critical: Place commands/, agents/, skills/, hooks/ at plugin root. Only plugin.json goes inside .claude-plugin/.

Minimal Plugin Example

1. Create Structure

mkdir -p my-plugin/.claude-plugin
mkdir -p my-plugin/commands

2. Create Manifest

// my-plugin/.claude-plugin/plugin.json
{
  "name": "my-plugin",
  "description": "Brief description of plugin purpose",
  "version": "1.0.0"
}

3. Add a Command

<!-- my-plugin/commands/hello.md -->
---
description: Greet the user warmly
---

# Hello Command

Greet the user and ask how you can help today.

4. Test Locally

claude --plugin-dir ./my-plugin

Then run: /my-plugin:hello

Component Types

Plugins can include any combination of:

| Component | Location | Format | |-----------|----------|--------| | Commands | commands/ | Markdown with frontmatter | | Agents | agents/ | Markdown with capabilities | | Skills | skills/*/SKILL.md | Markdown with YAML frontmatter | | Hooks | hooks/hooks.json or inline | JSON configuration | | MCP Servers | .mcp.json or inline | JSON configuration | | LSP Servers | .lsp.json or inline | JSON configuration |

See COMPONENTS.md for detailed documentation of each type.

Manifest Schema

Required and optional fields:

{
  "name": "plugin-name",
  "version": "1.0.0",
  "description": "What the plugin does",
  "author": {
    "name": "Your Name",
    "email": "you@example.com"
  },
  "homepage": "https://docs.example.com/plugin",
  "repository": "https://github.com/user/plugin",
  "license": "MIT",
  "keywords": ["keyword1", "keyword2"]
}

See MANIFEST.md for the complete schema.

Environment Variables

Use ${CLAUDE_PLUGIN_ROOT} for portable paths in hooks and servers:

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

Distribution

Via Marketplace

Create marketplace.json in repository
Host on GitHub/GitLab
Users add via /plugin marketplace add
Users install via /plugin install plugin-name@marketplace

Team Configuration

Add to .claude/settings.json:

{
  "extraKnownMarketplaces": {
    "team-plugins": {
      "source": {
        "source": "github",
        "repo": "org/claude-plugins"
      }
    }
  },
  "enabledPlugins": {
    "deploy-tools@team-plugins": true
  }
}

Private Repository Support (2.1.5+)

Distribute plugins via private repositories using authentication tokens:

| Provider | Environment Variable | Notes | |----------|---------------------|-------| | GitHub | GITHUB_TOKEN or GH_TOKEN | PAT with repo scope | | GitLab | GITLAB_TOKEN or GL_TOKEN | Token with read_repository scope | | Bitbucket | BITBUCKET_TOKEN | App password or repo access token |

Set in shell config or when running Claude Code:

export GITHUB_TOKEN=ghp_xxxxxxxxxxxxxxxxxxxx

See DISTRIBUTION.md for complete distribution guide.

Workflow: Create a Plugin

Prerequisites

[ ] Claude Code 1.0.33+ installed
[ ] Clear purpose for plugin
[ ] Components identified

Steps

Create Structure
- [ ] Create plugin directory
- [ ] Create .claude-plugin/ subdirectory
- [ ] Create component directories as needed
Create Manifest
- [ ] Add plugin.json with name, description, version
- [ ] Add author and metadata
Add Components
- [ ] Create commands in commands/
- [ ] Create agents in agents/
- [ ] Create skills in skills/*/SKILL.md
- [ ] Configure hooks in hooks/hooks.json
- [ ] Configure MCP in .mcp.json
- [ ] Configure LSP in .lsp.json
Test Locally
- [ ] Run claude --plugin-dir ./my-plugin
- [ ] Test each command
- [ ] Verify agents in /agents
- [ ] Confirm hooks fire correctly
Prepare Distribution
- [ ] Add README.md
- [ ] Create marketplace.json
- [ ] Push to repository

Validation

[ ] Commands appear with namespace prefix
[ ] All components load without errors
[ ] Scripts are executable (chmod +x)
[ ] Paths use ${CLAUDE_PLUGIN_ROOT}

CLI Commands

# Install plugin
claude plugin install plugin-name@marketplace --scope user

# Uninstall plugin
claude plugin uninstall plugin-name@marketplace

# Enable/disable plugin
claude plugin enable plugin-name@marketplace
claude plugin disable plugin-name@marketplace

# Update plugin
claude plugin update plugin-name@marketplace

# Debug loading
claude --debug

Common Mistakes

| Mistake | Fix | |---------|-----| | Components inside .claude-plugin/ | Move to plugin root | | Absolute paths in hooks | Use ${CLAUDE_PLUGIN_ROOT} | | Scripts not executable | Run chmod +x script.sh | | Missing shebang | Add #!/bin/bash first line | | Referencing parent dirs | Use symlinks or restructure |

Reference Files

| File | Contents | |------|----------| | MANIFEST.md | Complete manifest.json documentation | | COMPONENTS.md | All component type specifications | | DISTRIBUTION.md | Marketplace and team distribution |

Agent Skills: Creating Plugins

Skill Files