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",

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