plugin-creator

Plan Mode Guard

If plan mode is active, STOP immediately. Do not proceed to any step below. Instead, respond:

"The plugin-creator skill writes files and directories, which is not allowed in plan mode. Please exit plan mode first (/exit-plan), then invoke this skill again."

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Overview

Walks users through a structured workflow to scaffold a complete Claude Code plugin — producing a ready-to-use plugin directory with manifest, components, and changelog.

Follow these steps exactly.

Table of Contents

• Step 0: Disambiguation
• Step 1: Gather Plugin Requirements
• Step 2: Gather Component Details
• Step 3: Generate Plugin Manifest
• Step 4: Generate Plugin Files
• Step 5: Register in Marketplace

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Step 0: Disambiguation

Before proceeding, check if the user's intent is ambiguous. If the request could mean something other than creating a full plugin, clarify:

• "scaffold a skill" or "create a skill" — Ask: "Do you want to create a full plugin with a skill, or just add a skill to an existing plugin? For adding a single skill, try skill-reviewer:planning-skills."
• "create an agent" or "scaffold an agent" — Ask: "Do you want a full plugin containing an agent, or just add an agent to an existing plugin? For adding a single agent, try agent-creator."
• "set up a marketplace" — Redirect: "For marketplace infrastructure, use marketplace-builder instead."

If the user clearly wants a full plugin, proceed to Step 1.

---

Step 1: Gather Plugin Requirements

Ask the user up to 4 questions using AskUserQuestion to understand the plugin they want. Skip questions already answered.

Questions to consider (pick the most relevant):

1. Plugin name — "What should the plugin be called?" Validate: lowercase, hyphens only, no anthropic or claude substrings.
2. Purpose — "What does this plugin do? One sentence."
3. Components — "Which components does this plugin need?" Present options:
   • Commands — Explicit invocation via /plugin:command
   • Skills — Auto-activated by user intent
   • Agents — Autonomous sub-processes
   • Hooks — Event-driven triggers (pre/post tool execution)
   • MCP servers — External tool integrations
4. Target directory — Default to plugins/[name]/. Confirm with user.

After gathering answers, summarize:

**Plugin concept:**
- Name: [name]
- Purpose: [description]
- Components: [list]
- Location: plugins/[name]/

---

Step 2: Gather Component Details

For each component type selected in Step 1, gather specifics:

Commands

For each command:

• Name (kebab-case)
• One-sentence description (for frontmatter)
• Whether it accepts $ARGUMENTS

Skills

For each skill:

• Name (kebab-case)
• Description with trigger phrases ("Use when...")
• Design pattern: sequential, adaptive, or orchestrator
• Whether it needs reference files

Agents

For each agent:

• Name (kebab-case)
• Description with trigger phrases
• Tool preset: Read-Only, Code Editor, Full Access, or Custom
• Model preference: sonnet/opus/haiku/inherit

Hooks

For each hook:

• Event trigger (e.g., PreToolUse, PostToolUse)
• Matcher pattern
• Shell command to execute

MCP Servers

For each server:

• Server name
• Command and args to launch it
• Environment variables needed

Present the complete component plan for confirmation before proceeding.

---

Step 3: Generate Plugin Manifest

Generate plugin.json using the schema from references/plugin-json-schema.md.

Rules:

• name is required
• Do NOT include version (relative-path convention — version lives in marketplace.json only)
• Include description, author, license, keywords, homepage, repository
• Homepage format: https://github.com/[owner]/[repo]/tree/main/plugins/[name]

Present the manifest for confirmation:

"Here's the plugin manifest. Should I proceed?"

{
  "name": "[name]",
  "description": "[description]",
  ...
}

---

Step 4: Generate Plugin Files

After the user confirms, show the full file list before writing:

"I'll generate the following files at plugins/[name]/:

• .claude-plugin/plugin.json
• [list all component files]
• CHANGELOG.md

Should I proceed?"

File Generation Order

Write files sequentially using templates from references/component-templates.md:

1. .claude-plugin/plugin.json — Plugin manifest (from Step 3)
2. Component files in order: commands, skills, agents, hooks, MCP servers
3. CHANGELOG.md — Initial entry using Keep a Changelog format

For each component type:

• Commands: commands/[name].md with YAML frontmatter + markdown body
• Skills: skills/[name]/SKILL.md with YAML frontmatter + structured body. Create references/ subdirectory if the skill needs reference files
• Agents: agents/[name].md with YAML frontmatter + system prompt body
• Hooks: hooks.json at plugin root
• MCP servers: .mcp.json at plugin root

Error handling: If any file write fails, report which files succeeded and which failed. Do not stop on first failure.

Undo guidance: After all files are written, inform the user: "To undo, remove the plugins/[name]/ directory or run git checkout to revert."

---

Step 5: Register in Marketplace

This step is conditional — only offer when a marketplace.json file exists.

1. Use Glob to check for .claude-plugin/marketplace.json in the project root
2. If not found, skip: "No marketplace.json found — skipping marketplace registration. You can register later with plugin-manager."
3. If found, read it and ask: "Would you like to register this plugin in the marketplace?"

If the user confirms:

1. Read the existing marketplace.json
2. Check for duplicate names — if a plugin with the same name exists, warn and ask whether to overwrite or choose a different name
3. Confirm marketplace identity — "This marketplace is [name] v[version]. Register here?"
4. Add entry to the plugins array:

   {
     "name": "[plugin-name]",
     "source": "./plugins/[plugin-name]",
     "version": "1.0.0",
     "description": "[from plugin.json]",
     "category": "[ask user or infer]",
     "tags": ["relevant", "tags"]
   }
   

5. Write the updated marketplace.json

Final Summary

After all steps, present:

## Plugin Created

**Location:** plugins/[name]/
**Components:** [count] commands, [count] skills, [count] agents
**Marketplace:** [registered/not registered]

**Files created:**
- [list with line counts]

**Next steps:**
1. Load the plugin: `claude --plugin-dir ./plugins/[name]`
2. Test each component
3. Refine descriptions and instructions as needed