claude-howto/07-plugins/README.md

<picture>
  <source media="(prefers-color-scheme: dark)" srcset="../resources/logos/claude-howto-logo-dark.svg">
  <img alt="Claude How To" src="../resources/logos/claude-howto-logo.svg">
</picture>

# Claude Code Plugins

This folder contains complete plugin examples that bundle multiple Claude Code features into cohesive, installable packages.

## Overview

Claude Code Plugins are bundled collections of customizations (slash commands, subagents, MCP servers, and hooks) that install with a single command. They represent the highest-level extension mechanism—combining multiple features into cohesive, shareable packages.

## Plugin Architecture

```mermaid
graph TB
    A["Plugin"]
    B["Slash Commands"]
    C["Subagents"]
    D["MCP Servers"]
    E["Hooks"]
    F["Configuration"]

    A -->|bundles| B
    A -->|bundles| C
    A -->|bundles| D
    A -->|bundles| E
    A -->|bundles| F
```

## Plugin Loading Process

```mermaid
sequenceDiagram
    participant User
    participant Claude as Claude Code
    participant Plugin as Plugin Marketplace
    participant Install as Installation
    participant SlashCmds as Slash Commands
    participant Subagents
    participant MCPServers as MCP Servers
    participant Hooks
    participant Tools as Configured Tools

    User->>Claude: /plugin install pr-review
    Claude->>Plugin: Download plugin manifest
    Plugin-->>Claude: Return plugin definition
    Claude->>Install: Extract components
    Install->>SlashCmds: Configure
    Install->>Subagents: Configure
    Install->>MCPServers: Configure
    Install->>Hooks: Configure
    SlashCmds-->>Tools: Ready to use
    Subagents-->>Tools: Ready to use
    MCPServers-->>Tools: Ready to use
    Hooks-->>Tools: Ready to use
    Tools-->>Claude: Plugin installed ✅
```

## Plugin Types & Distribution

| Type | Scope | Shared | Authority | Examples |
|------|-------|--------|-----------|----------|
| Official | Global | All users | Anthropic | PR Review, Security Guidance |
| Community | Public | All users | Community | DevOps, Data Science |
| Organization | Internal | Team members | Company | Internal standards, tools |
| Personal | Individual | Single user | Developer | Custom workflows |

## Plugin Definition Structure

Plugin manifest uses JSON format in `.claude-plugin/plugin.json`:

```json
{
  "name": "my-first-plugin",
  "description": "A greeting plugin",
  "version": "1.0.0",
  "author": {
    "name": "Your Name"
  },
  "homepage": "https://example.com",
  "repository": "https://github.com/user/repo",
  "license": "MIT"
}
```

## Plugin Structure Example

```
my-plugin/
├── .claude-plugin/
│   └── plugin.json       # Manifest (name, description, version, author)
├── commands/             # Skills as Markdown files
│   ├── task-1.md
│   ├── task-2.md
│   └── workflows/
├── agents/               # Custom agent definitions
│   ├── specialist-1.md
│   ├── specialist-2.md
│   └── configs/
├── skills/               # Agent Skills with SKILL.md files
│   ├── skill-1.md
│   └── skill-2.md
├── hooks/                # Event handlers in hooks.json
│   └── hooks.json
├── .mcp.json             # MCP server configurations
├── .lsp.json             # LSP server configurations for code intelligence
├── bin/                  # Executables added to Bash tool's PATH while plugin is enabled
├── settings.json         # Default settings applied when plugin is enabled (currently only `agent` key supported)
├── templates/
│   └── issue-template.md
├── scripts/
│   ├── helper-1.sh
│   └── helper-2.py
├── docs/
│   ├── README.md
│   └── USAGE.md
└── tests/
    └── plugin.test.js
```

### LSP server configuration

Plugins can include Language Server Protocol (LSP) support for real-time code intelligence. LSP servers provide diagnostics, code navigation, and symbol information as you work.

**Configuration locations**:
- `.lsp.json` file in the plugin root directory
- Inline `lsp` key in `plugin.json`

#### Field reference

| Field | Required | Description |
|-------|----------|-------------|
| `command` | Yes | LSP server binary (must be in PATH) |
| `extensionToLanguage` | Yes | Maps file extensions to language IDs |
| `args` | No | Command-line arguments for the server |
| `transport` | No | Communication method: `stdio` (default) or `socket` |
| `env` | No | Environment variables for the server process |
| `initializationOptions` | No | Options sent during LSP initialization |
| `settings` | No | Workspace configuration passed to the server |
| `workspaceFolder` | No | Override the workspace folder path |
| `startupTimeout` | No | Maximum time (ms) to wait for server startup |
| `shutdownTimeout` | No | Maximum time (ms) for graceful shutdown |
| `restartOnCrash` | No | Automatically restart if the server crashes |
| `maxRestarts` | No | Maximum restart attempts before giving up |

#### Example configurations

**Go (gopls)**:

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

**Python (pyright)**:

```json
{
  "python": {
    "command": "pyright-langserver",
    "args": ["--stdio"],
    "extensionToLanguage": {
      ".py": "python",
      ".pyi": "python"
    }
  }
}
```

**TypeScript**:

```json
{
  "typescript": {
    "command": "typescript-language-server",
    "args": ["--stdio"],
    "extensionToLanguage": {
      ".ts": "typescript",
      ".tsx": "typescriptreact",
      ".js": "javascript",
      ".jsx": "javascriptreact"
    }
  }
}
```

#### Available LSP plugins

The official marketplace includes pre-configured LSP plugins:

| Plugin | Language | Server Binary | Install Command |
|--------|----------|---------------|----------------|
| `pyright-lsp` | Python | `pyright-langserver` | `pip install pyright` |
| `typescript-lsp` | TypeScript/JavaScript | `typescript-language-server` | `npm install -g typescript-language-server typescript` |
| `rust-lsp` | Rust | `rust-analyzer` | Install via `rustup component add rust-analyzer` |

#### LSP capabilities

Once configured, LSP servers provide:

- **Instant diagnostics** — errors and warnings appear immediately after edits
- **Code navigation** — go to definition, find references, implementations
- **Hover information** — type signatures and documentation on hover
- **Symbol listing** — browse symbols in the current file or workspace

## Plugin Options (v2.1.83+)

Plugins can declare user-configurable options in the manifest via `userConfig`. Values marked `sensitive: true` are stored in the system keychain rather than plain-text settings files:

```json
{
  "name": "my-plugin",
  "version": "1.0.0",
  "userConfig": {
    "apiKey": {
      "description": "API key for the service",
      "sensitive": true
    },
    "region": {
      "description": "Deployment region",
      "default": "us-east-1"
    }
  }
}
```

## Persistent Plugin Data (`${CLAUDE_PLUGIN_DATA}`) (v2.1.78+)

Plugins have access to a persistent state directory via the `${CLAUDE_PLUGIN_DATA}` environment variable. This directory is unique per plugin and survives across sessions, making it suitable for caches, databases, and other persistent state:

```json
{
  "hooks": {
    "PostToolUse": [
      {
        "command": "node ${CLAUDE_PLUGIN_DATA}/track-usage.js"
      }
    ]
  }
}
```

The directory is created automatically when the plugin is installed. Files stored here persist until the plugin is uninstalled.

## Inline Plugin via Settings (`source: 'settings'`) (v2.1.80+)

Plugins can be defined inline in settings files as marketplace entries using the `source: 'settings'` field. This allows embedding a plugin definition directly without requiring a separate repository or marketplace:

```json
{
  "pluginMarketplaces": [
    {
      "name": "inline-tools",
      "source": "settings",
      "plugins": [
        {
          "name": "quick-lint",
          "source": "./local-plugins/quick-lint"
        }
      ]
    }
  ]
}
```

## Plugin Settings

Plugins can ship a `settings.json` file to provide default configuration. This currently supports the `agent` key, which sets the main thread agent for the plugin:

```json
{
  "agent": "agents/specialist-1.md"
}
```

When a plugin includes `settings.json`, its defaults are applied on installation. Users can override these settings in their own project or user configuration.

## Standalone vs Plugin Approach

| Approach | Command Names | Configuration | Best For |
|----------|---------------|---|---|
| **Standalone** | `/hello` | Manual setup in CLAUDE.md | Personal, project-specific |
| **Plugins** | `/plugin-name:hello` | Automated via plugin.json | Sharing, distribution, team use |

Use **standalone slash commands** for quick personal workflows. Use **plugins** when you want to bundle multiple features, share with a team, or publish for distribution.

## Practical Examples

### Example 1: PR Review Plugin

**File:** `.claude-plugin/plugin.json`

```json
{
  "name": "pr-review",
  "version": "1.0.0",
  "description": "Complete PR review workflow with security, testing, and docs",
  "author": {
    "name": "Anthropic"
  },
  "repository": "https://github.com/your-org/pr-review",
  "license": "MIT"
}
```

**File:** `commands/review-pr.md`

```markdown
---
name: Review PR
description: Start comprehensive PR review with security and testing checks
---

# PR Review

This command initiates a complete pull request review including:

1. Security analysis
2. Test coverage verification
3. Documentation updates
4. Code quality checks
5. Performance impact assessment
```

**File:** `agents/security-reviewer.md`

```yaml
---
name: security-reviewer
description: Security-focused code review
tools: read, grep, diff
---

# Security Reviewer

Specializes in finding security vulnerabilities:
- Authentication/authorization issues
- Data exposure
- Injection attacks
- Secure configuration
```

**Installation:**

```bash
/plugin install pr-review

# Result:
# ✅ 3 slash commands installed
# ✅ 3 subagents configured
# ✅ 2 MCP servers connected
# ✅ 4 hooks registered
# ✅ Ready to use!
```

### Example 2: DevOps Plugin

**Components:**

```
devops-automation/
├── commands/
│   ├── deploy.md
│   ├── rollback.md
│   ├── status.md
│   └── incident.md
├── agents/
│   ├── deployment-specialist.md
│   ├── incident-commander.md
│   └── alert-analyzer.md
├── mcp/
│   ├── github-config.json
│   ├── kubernetes-config.json
│   └── prometheus-config.json
├── hooks/
│   ├── pre-deploy.js
│   ├── post-deploy.js
│   └── on-error.js
└── scripts/
    ├── deploy.sh
    ├── rollback.sh
    └── health-check.sh
```

### Example 3: Documentation Plugin

**Bundled Components:**

```
documentation/
├── commands/
│   ├── generate-api-docs.md
│   ├── generate-readme.md
│   ├── sync-docs.md
│   └── validate-docs.md
├── agents/
│   ├── api-documenter.md
│   ├── code-commentator.md
│   └── example-generator.md
├── mcp/
│   ├── github-docs-config.json
│   └── slack-announce-config.json
└── templates/
    ├── api-endpoint.md
    ├── function-docs.md
    └── adr-template.md
```

## Plugin Marketplace

The official Anthropic-managed plugin directory is `anthropics/claude-plugins-official`. Enterprise admins can also create private plugin marketplaces for internal distribution.

```mermaid
graph TB
    A["Plugin Marketplace"]
    B["Official<br/>anthropics/claude-plugins-official"]
    C["Community<br/>Marketplace"]
    D["Enterprise<br/>Private Registry"]

    A --> B
    A --> C
    A --> D

    B -->|Categories| B1["Development"]
    B -->|Categories| B2["DevOps"]
    B -->|Categories| B3["Documentation"]

    C -->|Search| C1["DevOps Automation"]
    C -->|Search| C2["Mobile Dev"]
    C -->|Search| C3["Data Science"]

    D -->|Internal| D1["Company Standards"]
    D -->|Internal| D2["Legacy Systems"]
    D -->|Internal| D3["Compliance"]

    style A fill:#e1f5fe,stroke:#333,color:#333
    style B fill:#e8f5e9,stroke:#333,color:#333
    style C fill:#f3e5f5,stroke:#333,color:#333
    style D fill:#fff3e0,stroke:#333,color:#333
```

### Marketplace Configuration

Enterprise and advanced users can control marketplace behavior through settings:

| Setting | Description |
|---------|-------------|
| `extraKnownMarketplaces` | Add additional marketplace sources beyond the defaults |
| `strictKnownMarketplaces` | Control which marketplaces users are allowed to add |
| `deniedPlugins` | Admin-managed blocklist to prevent specific plugins from being installed |

### Additional Marketplace Features

- **Default git timeout**: Increased from 30s to 120s for large plugin repositories
- **Custom npm registries**: Plugins can specify custom npm registry URLs for dependency resolution
- **Version pinning**: Lock plugins to specific versions for reproducible environments

### Marketplace definition schema

Plugin marketplaces are defined in `.claude-plugin/marketplace.json`:

```json
{
  "name": "my-team-plugins",
  "owner": "my-org",
  "plugins": [
    {
      "name": "code-standards",
      "source": "./plugins/code-standards",
      "description": "Enforce team coding standards",
      "version": "1.2.0",
      "author": "platform-team"
    },
    {
      "name": "deploy-helper",
      "source": {
        "source": "github",
        "repo": "my-org/deploy-helper",
        "ref": "v2.0.0"
      },
      "description": "Deployment automation workflows"
    }
  ]
}
```

| Field | Required | Description |
|-------|----------|-------------|
| `name` | Yes | Marketplace name in kebab-case |
| `owner` | Yes | Organization or user who maintains the marketplace |
| `plugins` | Yes | Array of plugin entries |
| `plugins[].name` | Yes | Plugin name (kebab-case) |
| `plugins[].source` | Yes | Plugin source (path string or source object) |
| `plugins[].description` | No | Brief plugin description |
| `plugins[].version` | No | Semantic version string |
| `plugins[].author` | No | Plugin author name |

### Plugin source types

Plugins can be sourced from multiple locations:

| Source | Syntax | Example |
|--------|--------|---------|
| **Relative path** | String path | `"./plugins/my-plugin"` |
| **GitHub** | `{ "source": "github", "repo": "owner/repo" }` | `{ "source": "github", "repo": "acme/lint-plugin", "ref": "v1.0" }` |
| **Git URL** | `{ "source": "url", "url": "..." }` | `{ "source": "url", "url": "https://git.internal/plugin.git" }` |
| **Git subdirectory** | `{ "source": "git-subdir", "url": "...", "path": "..." }` | `{ "source": "git-subdir", "url": "https://github.com/org/monorepo.git", "path": "packages/plugin" }` |
| **npm** | `{ "source": "npm", "package": "..." }` | `{ "source": "npm", "package": "@acme/claude-plugin", "version": "^2.0" }` |
| **pip** | `{ "source": "pip", "package": "..." }` | `{ "source": "pip", "package": "claude-data-plugin", "version": ">=1.0" }` |

GitHub and git sources support optional `ref` (branch/tag) and `sha` (commit hash) fields for version pinning.

### Distribution methods

**GitHub (recommended)**:
```bash
# Users add your marketplace
/plugin marketplace add owner/repo-name
```

**Other git services** (full URL required):
```bash
/plugin marketplace add https://gitlab.com/org/marketplace-repo.git
```

**Private repositories**: Supported via git credential helpers or environment tokens. Users must have read access to the repository.

**Official marketplace submission**: Submit plugins to the Anthropic-curated marketplace for broader distribution via [claude.ai/settings/plugins/submit](https://claude.ai/settings/plugins/submit) or [platform.claude.com/plugins/submit](https://platform.claude.com/plugins/submit).

### Strict mode

Control how marketplace definitions interact with local `plugin.json` files:

| Setting | Behavior |
|---------|----------|
| `strict: true` (default) | Local `plugin.json` is authoritative; marketplace entry supplements it |
| `strict: false` | Marketplace entry is the entire plugin definition |

**Organization restrictions** with `strictKnownMarketplaces`:

| Value | Effect |
|-------|--------|
| Not set | No restrictions — users can add any marketplace |
| Empty array `[]` | Lockdown — no marketplaces allowed |
| Array of patterns | Allowlist — only matching marketplaces can be added |

```json
{
  "strictKnownMarketplaces": [
    "my-org/*",
    "github.com/trusted-vendor/*"
  ]
}
```

> **Warning**: In strict mode with `strictKnownMarketplaces`, users can only install plugins from allowlisted marketplaces. This is useful for enterprise environments requiring controlled plugin distribution.

## Plugin Installation & Lifecycle

```mermaid
graph LR
    A["Discover"] -->|Browse| B["Marketplace"]
    B -->|Select| C["Plugin Page"]
    C -->|View| D["Components"]
    D -->|Install| E["/plugin install"]
    E -->|Extract| F["Configure"]
    F -->|Activate| G["Use"]
    G -->|Check| H["Update"]
    H -->|Available| G
    G -->|Done| I["Disable"]
    I -->|Later| J["Enable"]
    J -->|Back| G
```

## Plugin Features Comparison

| Feature | Slash Command | Skill | Subagent | Plugin |
|---------|---------------|-------|----------|--------|
| **Installation** | Manual copy | Manual copy | Manual config | One command |
| **Setup Time** | 5 minutes | 10 minutes | 15 minutes | 2 minutes |
| **Bundling** | Single file | Single file | Single file | Multiple |
| **Versioning** | Manual | Manual | Manual | Automatic |
| **Team Sharing** | Copy file | Copy file | Copy file | Install ID |
| **Updates** | Manual | Manual | Manual | Auto-available |
| **Dependencies** | None | None | None | May include |
| **Marketplace** | No | No | No | Yes |
| **Distribution** | Repository | Repository | Repository | Marketplace |

## Plugin CLI Commands

All plugin operations are available as CLI commands:

```bash
claude plugin install <name>@<marketplace>   # Install from a marketplace
claude plugin uninstall <name>               # Remove a plugin
claude plugin list                           # List installed plugins
claude plugin enable <name>                  # Enable a disabled plugin
claude plugin disable <name>                 # Disable a plugin
claude plugin validate                       # Validate plugin structure
```

## Installation Methods

### From Marketplace
```bash
/plugin install plugin-name
# or from CLI:
claude plugin install plugin-name@marketplace-name
```

### Enable / Disable (with auto-detected scope)
```bash
/plugin enable plugin-name
/plugin disable plugin-name
```

### Local Plugin (for development)
```bash
# CLI flag for local testing (repeatable for multiple plugins)
claude --plugin-dir ./path/to/plugin
claude --plugin-dir ./plugin-a --plugin-dir ./plugin-b
```

### From Git Repository
```bash
/plugin install github:username/repo
```

## When to Create a Plugin

```mermaid
graph TD
    A["Should I create a plugin?"]
    A -->|Need multiple components| B{"Multiple commands<br/>or subagents<br/>or MCPs?"}
    B -->|Yes| C["✅ Create Plugin"]
    B -->|No| D["Use Individual Feature"]
    A -->|Team workflow| E{"Share with<br/>team?"}
    E -->|Yes| C
    E -->|No| F["Keep as Local Setup"]
    A -->|Complex setup| G{"Needs auto<br/>configuration?"}
    G -->|Yes| C
    G -->|No| D
```

### Plugin Use Cases

| Use Case | Recommendation | Why |
|----------|-----------------|-----|
| **Team Onboarding** | ✅ Use Plugin | Instant setup, all configurations |
| **Framework Setup** | ✅ Use Plugin | Bundles framework-specific commands |
| **Enterprise Standards** | ✅ Use Plugin | Central distribution, version control |
| **Quick Task Automation** | ❌ Use Command | Overkill complexity |
| **Single Domain Expertise** | ❌ Use Skill | Too heavy, use skill instead |
| **Specialized Analysis** | ❌ Use Subagent | Create manually or use skill |
| **Live Data Access** | ❌ Use MCP | Standalone, don't bundle |

## Testing a Plugin

Before publishing, test your plugin locally using the `--plugin-dir` CLI flag (repeatable for multiple plugins):

```bash
claude --plugin-dir ./my-plugin
claude --plugin-dir ./my-plugin --plugin-dir ./another-plugin
```

This launches Claude Code with your plugin loaded, allowing you to:
- Verify all slash commands are available
- Test subagents and agents function correctly
- Confirm MCP servers connect properly
- Validate hook execution
- Check LSP server configurations
- Check for any configuration errors

## Hot-Reload

Plugins support hot-reload during development. When you modify plugin files, Claude Code can detect changes automatically. You can also force a reload with:

```bash
/reload-plugins
```

This re-reads all plugin manifests, commands, agents, skills, hooks, and MCP/LSP configurations without restarting the session.

## Managed Settings for Plugins

Administrators can control plugin behavior across an organization using managed settings:

| Setting | Description |
|---------|-------------|
| `enabledPlugins` | Allowlist of plugins that are enabled by default |
| `deniedPlugins` | Blocklist of plugins that cannot be installed |
| `extraKnownMarketplaces` | Add additional marketplace sources beyond the defaults |
| `strictKnownMarketplaces` | Restrict which marketplaces users are allowed to add |
| `allowedChannelPlugins` | Control which plugins are permitted per release channel |

These settings can be applied at the organization level via managed configuration files and take precedence over user-level settings.

## Plugin Security

Plugin subagents run in a restricted sandbox. The following frontmatter keys are **not allowed** in plugin subagent definitions:

- `hooks` -- Subagents cannot register event handlers
- `mcpServers` -- Subagents cannot configure MCP servers
- `permissionMode` -- Subagents cannot override the permission model

This ensures that plugins cannot escalate privileges or modify the host environment beyond their declared scope.

## Publishing a Plugin

**Steps to publish:**

1. Create plugin structure with all components
2. Write `.claude-plugin/plugin.json` manifest
3. Create `README.md` with documentation
4. Test locally with `claude --plugin-dir ./my-plugin`
5. Submit to plugin marketplace
6. Get reviewed and approved
7. Published on marketplace
8. Users can install with one command

**Example submission:**

```markdown
# PR Review Plugin

## Description
Complete PR review workflow with security, testing, and documentation checks.

## What's Included
- 3 slash commands for different review types
- 3 specialized subagents
- GitHub and CodeQL MCP integration
- Automated security scanning hooks

## Installation
```bash
/plugin install pr-review
```

## Features
✅ Security analysis
✅ Test coverage checking
✅ Documentation verification
✅ Code quality assessment
✅ Performance impact analysis

## Usage
```bash
/review-pr
/check-security
/check-tests
```

## Requirements
- Claude Code 1.0+
- GitHub access
- CodeQL (optional)
```

## Plugin vs Manual Configuration

**Manual Setup (2+ hours):**
- Install slash commands one by one
- Create subagents individually
- Configure MCPs separately
- Set up hooks manually
- Document everything
- Share with team (hope they configure correctly)

**With Plugin (2 minutes):**
```bash
/plugin install pr-review
# ✅ Everything installed and configured
# ✅ Ready to use immediately
# ✅ Team can reproduce exact setup
```

## Best Practices

### Do's ✅
- Use clear, descriptive plugin names
- Include comprehensive README
- Version your plugin properly (semver)
- Test all components together
- Document requirements clearly
- Provide usage examples
- Include error handling
- Tag appropriately for discovery
- Maintain backward compatibility
- Keep plugins focused and cohesive
- Include comprehensive tests
- Document all dependencies

### Don'ts ❌
- Don't bundle unrelated features
- Don't hardcode credentials
- Don't skip testing
- Don't forget documentation
- Don't create redundant plugins
- Don't ignore versioning
- Don't overcomplicate component dependencies
- Don't forget to handle errors gracefully

## Installation Instructions

### Installing from Marketplace

1. **Browse available plugins:**
   ```bash
   /plugin list
   ```

2. **View plugin details:**
   ```bash
   /plugin info plugin-name
   ```

3. **Install a plugin:**
   ```bash
   /plugin install plugin-name
   ```

### Installing from Local Path

```bash
/plugin install ./path/to/plugin-directory
```

### Installing from GitHub

```bash
/plugin install github:username/repo
```

### Listing Installed Plugins

```bash
/plugin list --installed
```

### Updating a Plugin

```bash
/plugin update plugin-name
```

### Disabling/Enabling a Plugin

```bash
# Temporarily disable
/plugin disable plugin-name

# Re-enable
/plugin enable plugin-name
```

### Uninstalling a Plugin

```bash
/plugin uninstall plugin-name
```

## Related Concepts

The following Claude Code features work together with plugins:

- **[Slash Commands](../01-slash-commands/)** - Individual commands bundled in plugins
- **[Memory](../02-memory/)** - Persistent context for plugins
- **[Skills](../03-skills/)** - Domain expertise that can be wrapped into plugins
- **[Subagents](../04-subagents/)** - Specialized agents included as plugin components
- **[MCP Servers](../05-mcp/)** - Model Context Protocol integrations bundled in plugins
- **[Hooks](../06-hooks/)** - Event handlers that trigger plugin workflows

## Complete Example Workflow

### PR Review Plugin Full Workflow

```
1. User: /review-pr

2. Plugin executes:
   ├── pre-review.js hook validates git repo
   ├── GitHub MCP fetches PR data
   ├── security-reviewer subagent analyzes security
   ├── test-checker subagent verifies coverage
   └── performance-analyzer subagent checks performance

3. Results synthesized and presented:
   ✅ Security: No critical issues
   ⚠️  Testing: Coverage 65% (recommend 80%+)
   ✅ Performance: No significant impact
   📝 12 recommendations provided
```

## Troubleshooting

### Plugin Won't Install
- Check Claude Code version compatibility: `/version`
- Verify `plugin.json` syntax with a JSON validator
- Check internet connection (for remote plugins)
- Review permissions: `ls -la plugin/`

### Components Not Loading
- Verify paths in `plugin.json` match actual directory structure
- Check file permissions: `chmod +x scripts/`
- Review component file syntax
- Check logs: `/plugin debug plugin-name`

### MCP Connection Failed
- Verify environment variables are set correctly
- Check MCP server installation and health
- Test MCP connection independently with `/mcp test`
- Review MCP configuration in `mcp/` directory

### Commands Not Available After Install
- Ensure plugin was installed successfully: `/plugin list --installed`
- Check if plugin is enabled: `/plugin status plugin-name`
- Restart Claude Code: `exit` and reopen
- Check for naming conflicts with existing commands

### Hook Execution Issues
- Verify hook files have correct permissions
- Check hook syntax and event names
- Review hook logs for error details
- Test hooks manually if possible

## Additional Resources

- [Official Plugins Documentation](https://code.claude.com/docs/en/plugins)
- [Discover Plugins](https://code.claude.com/docs/en/discover-plugins)
- [Plugin Marketplaces](https://code.claude.com/docs/en/plugin-marketplaces)
- [Plugins Reference](https://code.claude.com/docs/en/plugins-reference)
- [MCP Server Reference](https://modelcontextprotocol.io/)
- [Subagent Configuration Guide](../04-subagents/README.md)
- [Hook System Reference](../06-hooks/README.md)

---
**Last Updated**: April 11, 2026
**Claude Code Version**: 2.1.101
**Sources**:
- https://code.claude.com/docs/en/plugins
**Compatible Models**: Claude Sonnet 4.6, Claude Opus 4.6, Claude Haiku 4.5