Claude Code Marketplace Builder

What is a Marketplace?

A marketplace is a collection of Claude Code plugins that can be shared as a cohesive unit. Marketplaces enable:

• Centralized distribution of multiple related plugins
• Version control and sharing via git repositories
• Team-wide or community-wide plugin discovery
• Organized collections of plugins by theme, team, or purpose

Marketplace Directory Structure

A marketplace follows this structure:

my-marketplace/
├── .claude-plugin/
│   └── marketplace.json      # Marketplace manifest (REQUIRED)
├── plugin-one/
│   └── .claude-plugin/
│       └── plugin.json       # Individual plugin manifest
├── plugin-two/
│   └── .claude-plugin/
│       └── plugin.json
└── README.md                 # Documentation (recommended)

Key Points

• Marketplace manifest must be at .claude-plugin/marketplace.json in the marketplace root
• Each plugin within the marketplace has its own plugin.json manifest
• Plugins can be in any subdirectory structure you prefer
• Git version control is recommended for sharing and collaboration

Marketplace Manifest (marketplace.json)

Location and Requirements

The marketplace manifest MUST be located at:

.claude-plugin/marketplace.json

This file defines the marketplace metadata and lists all available plugins.

Required Fields

{
  "name": "my-marketplace",
  "owner": {
    "name": "Your Name"
  },
  "plugins": []
}

Field Descriptions:

• name: Marketplace identifier in kebab-case (e.g., "team-tools", "data-science-plugins")
• owner.name: Maintainer's name (REQUIRED)
• owner.email: Maintainer's email (OPTIONAL)
• plugins: Array of plugin entries (can be empty initially)

Optional Metadata Fields

{
  "name": "my-marketplace",
  "description": "Marketplace description",
  "version": "1.0.0",
  "owner": {
    "name": "Your Name",
    "email": "you@example.com"
  },
  "homepage": "https://github.com/username/marketplace",
  "plugins": []
}

Additional Fields:

• description: Brief overview of the marketplace's purpose
• version: Marketplace version (semantic versioning)
• homepage: URL to marketplace documentation or repository

Adding Plugins to Marketplace

Plugin Entry Structure

Each plugin in the plugins array requires:

{
  "plugins": [
    {
      "name": "plugin-name",
      "source": "./plugin-directory",
      "description": "Brief description"
    }
  ]
}

Plugin Entry Fields:

• name: Plugin identifier (MUST match the plugin's plugin.json name)
• source: Path or URL to plugin (see Plugin Sources section)
• description: Brief description (optional but recommended for discoverability)

Example with Multiple Plugins

{
  "name": "team-productivity",
  "owner": {
    "name": "Engineering Team"
  },
  "description": "Productivity tools for our engineering team",
  "plugins": [
    {
      "name": "code-review-helper",
      "source": "./code-review-helper",
      "description": "Automated code review assistance"
    },
    {
      "name": "pr-templates",
      "source": "./pr-templates",
      "description": "Standardized PR templates and workflows"
    },
    {
      "name": "testing-utils",
      "source": "./testing-utils",
      "description": "Test generation and coverage tools"
    }
  ]
}

Plugin Sources

Plugin sources in marketplace.json support multiple formats:

Local Path (Relative)

{
  "name": "local-plugin",
  "source": "./local-plugin"
}

Use for plugins stored within the marketplace directory. Paths must be relative to the marketplace root.

GitHub Repository

{
  "name": "github-plugin",
  "source": "github:username/repo"
}

Use for plugins hosted on GitHub. Claude Code will clone the repository.

Git URL

{
  "name": "git-plugin",
  "source": "https://github.com/username/repo.git"
}

Use for plugins hosted on any Git provider. Full git URLs are supported.

Mixed Sources Example

{
  "plugins": [
    {
      "name": "internal-tool",
      "source": "./internal-tool",
      "description": "Internal team tool"
    },
    {
      "name": "community-plugin",
      "source": "github:community/awesome-plugin",
      "description": "Community-maintained plugin"
    },
    {
      "name": "external-tool",
      "source": "https://gitlab.com/team/tool.git",
      "description": "External Git repository"
    }
  ]
}

Creating a Marketplace: Step-by-Step

Step 1: Create Marketplace Directory

mkdir my-marketplace
cd my-marketplace

Step 2: Create Marketplace Manifest

mkdir .claude-plugin

Create .claude-plugin/marketplace.json:

{
  "name": "my-marketplace",
  "owner": {
    "name": "Your Name"
  },
  "plugins": []
}

Step 3: Initialize Git (Recommended)

git init

Version control enables:

• Easy sharing via repository URL
• Version history tracking
• Collaboration workflows
• Distribution to users

Step 4: Add Plugins

For each plugin you want to include:

1. Create plugin directory:

   mkdir my-plugin
   mkdir my-plugin/.claude-plugin
   

2. Create plugin manifest (my-plugin/.claude-plugin/plugin.json):

   {
     "name": "my-plugin",
     "version": "1.0.0",
     "description": "Plugin description"
   }
   

3. Add plugin components (skills, commands, agents, etc.)

4. Update marketplace.json:

   {
     "plugins": [
       {
         "name": "my-plugin",
         "source": "./my-plugin",
         "description": "Plugin description"
       }
     ]
   }
   

Step 5: Test Locally

Add marketplace to Claude Code:

/plugin marketplace add /path/to/my-marketplace

Install and test plugins:

/plugin install my-plugin@my-marketplace

Verify installation:

• Run /plugin to see installed plugins
• Check /help for new commands
• Test plugin functionality

Local Development Workflow

Testing Changes

When modifying plugins in your marketplace:

1. Uninstall old version:

   /plugin uninstall plugin-name@marketplace-name
   

2. Reinstall updated version:

   /plugin install plugin-name@marketplace-name
   

Alternatively, restart Claude Code to reload all plugins.

Development Iteration

Recommended workflow:

1. Make changes to plugin files
2. Uninstall → Reinstall plugin
3. Test functionality
4. Commit changes to git
5. Repeat as needed

Debugging

Use debug mode to troubleshoot:

claude --debug

This shows:

• Marketplace loading status
• Plugin loading status
• Manifest validation errors
• Component registration
• Any warnings or errors

Distribution and Sharing

Sharing Your Marketplace

1. Commit to git:

   git add .
   git commit -m "Add marketplace with plugins"
   

2. Push to remote repository:

   git remote add origin <repository-url>
   git push -u origin main
   

3. Share with users: Users add your marketplace:

   /plugin marketplace add <repository-url>
   

   Or for local paths:

   /plugin marketplace add /path/to/marketplace
   

4. Install plugins:

   /plugin install plugin-name@marketplace-name
   

Managing Plugin Lifecycle

Users can manage installed plugins:

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

# Disable plugin
/plugin disable plugin-name@marketplace-name

# Uninstall plugin
/plugin uninstall plugin-name@marketplace-name

Testing Checklist

Before distributing your marketplace:

• marketplace.json has required fields (name, owner, plugins)
• All plugin entries have name and source
• Plugin names match their plugin.json names
• Local plugin paths are relative and start with ./
• All plugins install without errors
• Tested with claude --debug for warnings
• README.md documents marketplace purpose and plugins
• Repository is properly initialized with git
• All changes are committed

Best Practices

For comprehensive best practices on organization, versioning, distribution, and collaboration, see reference/best-practices.md.

Key Takeaways

Marketplace Essentials

1. Marketplace manifest MUST be at .claude-plugin/marketplace.json (not root)
2. Each plugin entry needs name, source, and optionally description
3. Plugin sources can be local paths (./plugin), GitHub repos (github:user/repo), or Git URLs
4. Add marketplace once: /plugin marketplace add <path-or-url>
5. Install plugins: /plugin install plugin-name@marketplace-name

Development Workflow

1. Create marketplace directory with .claude-plugin/marketplace.json
2. Add plugins with their own plugin.json manifests
3. Test locally before sharing: /plugin marketplace add /local/path
4. Use git for version control and distribution
5. Update workflow: uninstall → reinstall or restart Claude Code

Distribution

1. Share via git repository URL or local path
2. Users add marketplace, then browse/install plugins
3. Marketplace can mix local and remote plugin sources
4. Use semantic versioning for both marketplace and plugins
5. Document installation and usage in README

Common Patterns

For detailed examples of personal, team, community, and hybrid marketplace patterns, see reference/best-practices.md.