Plugin Integrator

Package standalone skills into properly structured Claude Code plugins and register them in the marketplace.

When to use this skill

Use this when you need to:

Convert a standalone skill (a SKILL.md with optional supporting files) into a marketplace plugin
Scaffold a new empty plugin directory with the correct structure
Register an existing plugin in marketplace.json and the root README.md
Validate that a plugin follows marketplace conventions

The plugin structure

Every plugin in this marketplace follows a consistent directory layout:

plugin-name/
├── .claude-plugin/
│   └── plugin.json          # Local plugin metadata
├── README.md                # Plugin documentation
├── skills/
│   └── <skill-name>/        # Named subdirectory for the skill
│       ├── SKILL.md          # The skill definition (required)
│       ├── references/       # Detailed reference docs (optional)
│       ├── examples/         # Working code examples (optional)
│       ├── templates/        # Scaffolding templates (optional)
│       ├── scripts/          # Executable scripts (optional)
│       ├── agents/           # Subagent definitions (optional)
│       └── assets/           # Static files used in output (optional)
└── commands/                # Slash command definitions (optional)
    └── command-name.md

The skill lives in a named subdirectory under skills/ (e.g., skills/drawio-creation/SKILL.md, skills/plugin-integrator/SKILL.md). The subdirectory name should be kebab-case and describe what the skill does.

Step-by-step integration process

Step 1: Identify the source material

Determine what the user is starting from:

A standalone SKILL.md (with or without supporting files like references/, scripts/, etc.)
An existing directory with skill-like content that needs restructuring
A concept that needs both a skill and a plugin scaffold

Read the source material thoroughly. Understand what the skill does, what supporting files it needs, and what its trigger conditions are.

Step 2: Create the plugin directory

Create plugins/<plugin-name>/ following the structure above. The plugin name should be kebab-case and match the skill's purpose.

Create the directory structure:

plugins/<plugin-name>/
├── .claude-plugin/
├── skills/
│   └── <skill-name>/
└── (commands/ if the skill benefits from a slash command)

Copy or move the SKILL.md and all supporting files into skills/<skill-name>/. The skill name should be kebab-case and describe what the skill does (e.g., drawio-creation, jarchi-scripting, plugin-integrator). Preserve the internal directory structure (references/, examples/, scripts/, etc.).
If the skill has a LICENSE file, keep it alongside the SKILL.md in the skill subdirectory.

Step 3: Create plugin.json

Write .claude-plugin/plugin.json with this exact structure:

{
  "name": "<plugin-name>",
  "version": "1.0.0",
  "description": "<one-line description matching what goes in marketplace.json>",
  "author": {
    "name": "Thomas Klok Rohde"
  },
  "keywords": ["keyword1", "keyword2", "keyword3"]
}

Use 3-8 relevant keywords. The description should be concise but descriptive — it's the same text that appears in marketplace.json.

Step 4: Write the README.md

The README follows a standard template. Read references/readme-template.md for the full template. Key sections:

Title: # <Plugin Name> Plugin for Claude Code
Description: One sentence summarizing the plugin
Features: 3-5 bullet points with bold labels
Installation: Standard code block with claude --plugin-dir and .claude-plugin/ copy instructions
Usage: Include "Automatic Skill Activation" subsection listing trigger phrases, and optionally "Command Usage" if a slash command exists
Example Requests: 3-5 realistic prompts
Components: List skills, commands, and references
License: Brief license note

Step 5: Register in marketplace.json

Add an entry to .claude-plugin/marketplace.json in the plugins array:

{
  "name": "<plugin-name>",
  "source": "./plugins/<plugin-name>",
  "description": "<same description as plugin.json>",
  "version": "1.0.0",
  "author": {
    "name": "Thomas Klok Rohde",
    "email": "thomas@rohde.name"
  },
  "repository": "https://github.com/ThomasRohde/marketplace",
  "keywords": ["keyword1", "keyword2"],
  "category": "productivity"
}

Step 6: Update the root README.md

Add the plugin to the "Available Plugins" section in alphabetical order among the existing entries:

### <plugin-name>

<One-line description.>

**Install:**
```shell
/plugin install <plugin-name>@thomas-rohde-plugins

Keywords: keyword1, keyword2, keyword3


Also add the plugin to the "Marketplace Structure" ASCII tree diagram.

### Step 7: Validate

After integration, verify:
- [ ] `plugins/<plugin-name>/skills/<skill-name>/SKILL.md` exists with valid YAML frontmatter (name + description)
- [ ] `plugins/<plugin-name>/.claude-plugin/plugin.json` exists and is valid JSON
- [ ] `plugins/<plugin-name>/README.md` exists with all required sections
- [ ] `.claude-plugin/marketplace.json` has the new entry and is valid JSON
- [ ] Root `README.md` includes the plugin in "Available Plugins" and the directory tree
- [ ] All supporting files (references, examples, scripts) are inside `skills/<skill-name>/`
- [ ] No broken internal paths in the SKILL.md (e.g., references to `references/` still resolve)

## Optional: Create a slash command

If the skill benefits from a quick-trigger command, create `commands/<command-name>.md`:

```yaml
---
description: "Short description of what the command does"
argument-hint: <what to pass as argument>
allowed-tools: Read, Write, Glob, Grep, Edit, Bash
---

The command body should briefly describe the task, reference the skill for domain knowledge, and specify output requirements. See existing commands in other plugins for examples.

Reference files

references/readme-template.md — Full README.md template with all sections and formatting
references/marketplace-schema.md — JSON schemas for marketplace.json and plugin.json

plugin-integrator