Marketplace Structure

A plugin marketplace is a catalog of available plugins that enables centralized discovery, version management, and distribution. This skill covers creating and maintaining marketplaces for team or community plugin distribution.

Overview

Marketplaces provide:

• Centralized discovery - Browse plugins from multiple sources in one place
• Version management - Track and update plugin versions automatically
• Team distribution - Share required plugins across an organization
• Flexible sources - Support for relative paths, GitHub repos, and git URLs

When to Create a Marketplace vs. a Plugin

| Create a Plugin | Create a Marketplace | | ----------------------------------- | ------------------------------------ | | Single-purpose extension | Collection of related plugins | | Used directly by end users | Distributes multiple plugins | | One team or individual maintains it | Curates plugins from various sources | | Installed via /plugin install | Added via /plugin marketplace add |

Directory Structure

Place marketplace.json in the .claude-plugin/ directory at the repository root:

marketplace-repo/
├── .claude-plugin/
│   └── marketplace.json      # Required: Marketplace manifest
├── plugins/                  # Optional: Local plugin directories
│   ├── plugin-one/
│   │   └── .claude-plugin/
│   │       └── plugin.json
│   └── plugin-two/
│       └── .claude-plugin/
│           └── plugin.json
└── README.md                 # Recommended: Marketplace documentation

Marketplace Schema

The marketplace.json manifest defines the marketplace and its available plugins.

Required Fields

| Field | Type | Description | | --------- | ------ | ---------------------------------------------- | | name | string | Marketplace identifier (kebab-case, no spaces) | | owner | object | Marketplace maintainer information | | plugins | array | List of available plugin entries |

Owner Object

{
  "owner": {
    "name": "Team Name",
    "email": "team@example.com",
    "url": "https://github.com/team"
  }
}

Optional Metadata

{
  "metadata": {
    "description": "Brief marketplace description",
    "version": "1.0.0",
    "pluginRoot": "./plugins"
  }
}

The pluginRoot field sets the base path for relative plugin sources.

Plugin Entry Format

Each plugin in the plugins array requires:

| Field | Type | Description | | -------- | ---------------- | --------------------------------------------------------- | | name | string | Plugin identifier (kebab-case, unique within marketplace) | | source | string or object | Where to fetch the plugin |

Optional Plugin Fields

Standard metadata fields:

• description - Brief plugin description
• version - Plugin version (semver)
• author - Author information object
• homepage - Documentation URL
• repository - Source code URL
• license - SPDX license identifier
• keywords - Tags for discovery
• category - Plugin category
• tags - Additional searchability tags

Component configuration fields:

• commands - Custom paths to command files or directories
• agents - Custom paths to agent files
• hooks - Hooks configuration or path to hooks file
• mcpServers - MCP server configurations

For complete field reference, see references/schema-reference.md.

Plugin Sources

Relative Paths

For plugins within the same repository:

{
  "name": "my-plugin",
  "source": "./plugins/my-plugin"
}

GitHub Repositories

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

Git URLs

For GitLab, Bitbucket, or self-hosted git:

{
  "name": "git-plugin",
  "source": {
    "source": "url",
    "url": "https://gitlab.com/team/plugin.git"
  }
}

Strict vs. Non-Strict Mode

The strict field controls whether plugins must have their own plugin.json:

| Mode | Behavior | | ------------------------ | --------------------------------------------------------------------- | | strict: true (default) | Plugin must include plugin.json; marketplace entry supplements it | | strict: false | plugin.json optional; marketplace entry serves as complete manifest |

Use strict: false when:

• Curating external plugins without modifying their source
• Providing all metadata in the marketplace entry
• Plugin directories contain only commands/agents/skills without manifest

{
  "name": "external-plugin",
  "source": {
    "source": "github",
    "repo": "external/plugin"
  },
  "description": "Complete metadata here",
  "version": "2.0.0",
  "strict": false
}

Best Practices

Organization

• One theme per marketplace - Group related plugins (e.g., "frontend-tools", "security-plugins")
• Clear naming - Use descriptive kebab-case names for both marketplace and plugins
• Version all entries - Include version for every plugin entry
• Document each plugin - Provide description for discoverability

Versioning

• Use semantic versioning (X.Y.Z) for marketplace metadata.version
• Update marketplace version when adding, removing, or updating plugins
• Consider a CHANGELOG.md for tracking changes

Distribution

• GitHub hosting - Simplest distribution via /plugin marketplace add owner/repo
• Team settings - Configure extraKnownMarketplaces in .claude/settings.json
• Local testing - Add with /plugin marketplace add ./path during development

For detailed distribution patterns, see references/distribution-patterns.md.

Validation

Validate marketplace structure before publishing:

# Check JSON syntax
jq . .claude-plugin/marketplace.json

# Verify required fields
jq 'has("name") and has("owner") and has("plugins")' .claude-plugin/marketplace.json

Use the plugin-validator agent with marketplace support for comprehensive validation.

Complete Example

{
  "name": "team-tools",
  "owner": {
    "name": "DevTools Team",
    "email": "devtools@company.com",
    "url": "https://github.com/company"
  },
  "metadata": {
    "description": "Internal development tools for the engineering team",
    "version": "1.0.0"
  },
  "plugins": [
    {
      "name": "code-formatter",
      "source": "./plugins/formatter",
      "description": "Automatic code formatting on save",
      "version": "2.1.0"
    },
    {
      "name": "security-scanner",
      "source": {
        "source": "github",
        "repo": "company/security-plugin"
      },
      "description": "Security vulnerability detection",
      "version": "1.5.0",
      "category": "security"
    }
  ]
}

Additional Resources

• references/schema-reference.md - Complete field reference for marketplace.json
• references/distribution-patterns.md - Hosting and team distribution strategies
• examples/minimal-marketplace.md - Single plugin marketplace template
• examples/team-marketplace.md - Internal company marketplace template
• examples/community-marketplace.md - Public multi-plugin marketplace template

Related Skills

• plugin-structure - For individual plugin plugin.json details
• plugin-validator agent - For validating marketplace structure
• /plugin-dev:create-marketplace - Guided marketplace creation workflow

Working Example

This repository (plugin-dev) is itself a marketplace. Examine .claude-plugin/marketplace.json at the repository root for a real-world example of marketplace structure and plugin organization.