Plugin Forge Skill for Claude

CC Plugin Forge

Purpose

Build and manage Claude Code plugins with correct structure, manifests, and marketplace integration. Includes workflows, automation scripts, and reference docs.

When to Use

• Creating new plugins for a marketplace
• Adding/modifying plugin components (commands, skills, agents, hooks)
• Updating plugin versions
• Working with plugin or marketplace manifests
• Setting up local plugin testing
• Publishing plugins

Getting Started

Create New Plugin

Use create_plugin.py to generate plugin structure:

python scripts/create_plugin.py plugin-name \
  --marketplace-root /path/to/marketplace \
  --author-name "Your Name" \
  --author-email "[email protected]" \
  --description "Plugin description" \
  --keywords "keyword1,keyword2" \
  --category "productivity"

This automatically:

• Creates plugin directory structure
• Generates plugin.json manifest
• Creates README template
• Updates marketplace.json

Bump Version

Use bump_version.py to update versions in both manifests:

python scripts/bump_version.py plugin-name major|minor|patch \
  --marketplace-root /path/to/marketplace

Semantic versioning:

• major: Breaking changes (1.0.0 → 2.0.0)
• minor: New features, refactoring (1.0.0 → 1.1.0)
• patch: Bug fixes, docs (1.0.0 → 1.0.1)

Development Workflow

1. Create Structure

Manual approach (if not using script):

mkdir -p plugins/plugin-name/.claude-plugin
mkdir -p plugins/plugin-name/commands
mkdir -p plugins/plugin-name/skills

2. Plugin Manifest

File: plugins/plugin-name/.claude-plugin/plugin.json

{
  "name": "plugin-name",
  "version": "0.1.0",
  "description": "Plugin description",
  "author": {
    "name": "Your Name",
    "email": "[email protected]"
  },
  "keywords": ["keyword1", "keyword2"]
}

3. Register in Marketplace

Update .claude-plugin/marketplace.json:

{
  "name": "plugin-name",
  "source": "./plugins/plugin-name",
  "description": "Plugin description",
  "version": "0.1.0",
  "keywords": ["keyword1", "keyword2"],
  "category": "productivity"
}

4. Add Components

Create in respective directories:

| Component | Location | Format |

|-----------|----------|--------|

| Commands | commands/ | Markdown with frontmatter |

| Skills | skills/<name>/ | Directory with SKILL.md |

| Agents | agents/ | Markdown definitions |

| Hooks | hooks/hooks.json | Event handlers |

| MCP Servers | .mcp.json | External integrations |

5. Local Testing

# Add marketplace
/plugin marketplace add /path/to/marketplace-root

# Install plugin
/plugin install plugin-name@marketplace-name

# After changes: reinstall
/plugin uninstall plugin-name@marketplace-name
/plugin install plugin-name@marketplace-name

Plugin Patterns

Framework Plugin

For framework-specific guidance (React, Vue, etc.):

plugins/framework-name/
├── .claude-plugin/plugin.json
├── skills/
│   └── framework-name/
│       ├── SKILL.md
│       └── references/
├── commands/
│   └── prime/
│       ├── components.md
│       └── framework.md
└── README.md

Utility Plugin

For tools and commands:

plugins/utility-name/
├── .claude-plugin/plugin.json
├── commands/
│   ├── action1.md
│   └── action2.md
└── README.md

Domain Plugin

For domain-specific knowledge:

plugins/domain-name/
├── .claude-plugin/plugin.json
├── skills/
│   └── domain-name/
│       ├── SKILL.md
│       ├── references/
│       └── scripts/
└── README.md

Command Naming

Subdirectory-based namespacing with : separator:

• commands/namespace/command.md → /namespace:command
• commands/simple.md → /simple

Examples:

• commands/prime/vue.md → /prime:vue
• commands/docs/generate.md → /docs:generate

Version Management

Important: Update version in BOTH locations:

• plugins/<name>/.claude-plugin/plugin.json
• .claude-plugin/marketplace.json

Use bump_version.py to automate.

Git Commits

Use conventional commits:

git commit -m "feat: add new plugin"
git commit -m "fix: correct plugin manifest"
git commit -m "docs: update plugin README"
git commit -m "feat!: breaking change"

Reference Docs

Detailed documentation included:

| Reference | Content |

|-----------|---------|

| references/plugin-structure.md | Directory structure, manifest schema, components |

| references/marketplace-schema.md | Marketplace format, plugin entries, distribution |

| references/workflows.md | Step-by-step workflows, patterns, publishing |

Scripts

| Script | Purpose |

|--------|---------|

| scripts/create_plugin.py | Scaffold new plugin |

| scripts/bump_version.py | Update versions |