Plugin Creator

Quick Start

1. •Run the scaffold script:

  # Plugin names are normalized to lower-case hyphen-case and must be <= 64 chars.
  # The generated folder and plugin.json name are always the same.
# Run from repo root (or replace .agents/... with the absolute path to this SKILL).
# By default creates in <repo_root>/plugins/<plugin-name>.
python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py <plugin-name>

1. •

   Open <plugin-path>/.codex-plugin/plugin.json and replace [TODO: ...] placeholders.

2. •

   Generate or update the repo marketplace entry when the plugin should appear in Codex UI ordering:

# marketplace.json always lives at <repo-root>/.agents/plugins/marketplace.json
python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin --with-marketplace

For a home-local plugin, treat <home> as the root and use:

python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin \
  --path ~/plugins \
  --marketplace-path ~/.agents/plugins/marketplace.json \
  --with-marketplace

1. •Generate/adjust optional companion folders as needed:

python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin --path <parent-plugin-directory> \
  --with-skills --with-hooks --with-scripts --with-assets --with-mcp --with-apps --with-marketplace

<parent-plugin-directory> is the directory where the plugin folder <plugin-name> will be created (for example ~/code/plugins).

What this skill creates

• •If the user has not made the plugin location explicit, ask whether they want a repo-local plugin or a home-local plugin before generating marketplace entries.
• •Creates plugin root at /<parent-plugin-directory>/<plugin-name>/.
• •Always creates /<parent-plugin-directory>/<plugin-name>/.codex-plugin/plugin.json.
• •Fills the manifest with the full schema shape, placeholder values, and the complete interface section.
• •Creates or updates <repo-root>/.agents/plugins/marketplace.json when --with-marketplace is set.
  • •If the marketplace file does not exist yet, seed top-level name plus interface.displayName placeholders before adding the first plugin entry.
• •<plugin-name> is normalized using skill-creator naming rules:
  • •My Plugin → my-plugin
  • •My--Plugin → my-plugin
  • •underscores, spaces, and punctuation are converted to -
  • •result is lower-case hyphen-delimited with consecutive hyphens collapsed
• •Supports optional creation of:
  • •skills/
  • •hooks/
  • •scripts/
  • •assets/
  • •.mcp.json
  • •.app.json

Marketplace workflow

• •marketplace.json always lives at <repo-root>/.agents/plugins/marketplace.json.
• •For a home-local plugin, use the same convention with <home> as the root: ~/.agents/plugins/marketplace.json plus ./plugins/<plugin-name>.
• •Marketplace root metadata supports top-level name plus optional interface.displayName.
• •Treat plugin order in plugins[] as render order in Codex. Append new entries unless a user explicitly asks to reorder the list.
• •displayName belongs inside the marketplace interface object, not individual plugins[] entries.
• •Each generated marketplace entry must include all of:
  • •policy.installation
  • •policy.authentication
  • •category
• •Default new entries to:
  • •policy.installation: "AVAILABLE"
  • •policy.authentication: "ON_INSTALL"
• •Override defaults only when the user explicitly specifies another allowed value.
• •Allowed policy.installation values:
  • •NOT_AVAILABLE
  • •AVAILABLE
  • •INSTALLED_BY_DEFAULT
• •Allowed policy.authentication values:
  • •ON_INSTALL
  • •ON_USE
• •Treat policy.products as an override. Omit it unless the user explicitly requests product gating.
• •The generated plugin entry shape is:

{
  "name": "plugin-name",
  "source": {
    "source": "local",
    "path": "./plugins/plugin-name"
  },
  "policy": {
    "installation": "AVAILABLE",
    "authentication": "ON_INSTALL"
  },
  "category": "Productivity"
}

• •

  Use --force only when intentionally replacing an existing marketplace entry for the same plugin name.

• •

  If <repo-root>/.agents/plugins/marketplace.json does not exist yet, create it with top-level "name", an "interface" object containing "displayName", and a plugins array, then add the new entry.

• •

  For a brand-new marketplace file, the root object should look like:

{
  "name": "[TODO: marketplace-name]",
  "interface": {
    "displayName": "[TODO: Marketplace Display Name]"
  },
  "plugins": [
    {
      "name": "plugin-name",
      "source": {
        "source": "local",
        "path": "./plugins/plugin-name"
      },
      "policy": {
        "installation": "AVAILABLE",
        "authentication": "ON_INSTALL"
      },
      "category": "Productivity"
    }
  ]
}

Required behavior

• •Outer folder name and plugin.json "name" are always the same normalized plugin name.
• •Do not remove required structure; keep .codex-plugin/plugin.json present.
• •Keep manifest values as placeholders until a human or follow-up step explicitly fills them.
• •If creating files inside an existing plugin path, use --force only when overwrite is intentional.
• •Preserve any existing marketplace interface.displayName.
• •When generating marketplace entries, always write policy.installation, policy.authentication, and category even if their values are defaults.
• •Add policy.products only when the user explicitly asks for that override.
• •Keep marketplace source.path relative to repo root as ./plugins/<plugin-name>.

Reference to exact spec sample

For the exact canonical sample JSON for both plugin manifests and marketplace entries, use:

• •references/plugin-json-spec.md

Validation

After editing SKILL.md, run:

python3 <path-to-skill-creator>/scripts/quick_validate.py .agents/skills/plugin-creator