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skills/.system/plugin-creator/LICENSE.txt
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skills/.system/plugin-creator/SKILL.md
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---
name: plugin-creator
description: Create and scaffold plugin directories for Codex with a required `.codex-plugin/plugin.json`, optional plugin folders/files, and baseline placeholders you can edit before publishing or testing. Use when Codex needs to create a new local plugin, add optional plugin structure, or generate or update repo-root `.agents/plugins/marketplace.json` entries for plugin ordering and availability metadata.
---
# Plugin Creator
## Quick Start
1. Run the scaffold script:
```bash
# 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>
```
2. Open `<plugin-path>/.codex-plugin/plugin.json` and replace `[TODO: ...]` placeholders.
3. Generate or update the repo marketplace entry when the plugin should appear in Codex UI ordering:
```bash
# 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:
```bash
python3 .agents/skills/plugin-creator/scripts/create_basic_plugin.py my-plugin \
--path ~/plugins \
--marketplace-path ~/.agents/plugins/marketplace.json \
--with-marketplace
```
4. Generate/adjust optional companion folders as needed:
```bash
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:
```json
{
"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:
```json
{
"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:
```bash
python3 <path-to-skill-creator>/scripts/quick_validate.py .agents/skills/plugin-creator
```
skills/.system/plugin-creator/agents/openai.yaml
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interface:
display_name: "Plugin Creator"
short_description: "Scaffold plugins and marketplace entries"
default_prompt: "Use $plugin-creator to scaffold a plugin with placeholder plugin.json, optional structure, and a marketplace.json entry."
icon_small: "./assets/plugin-creator-small.svg"
icon_large: "./assets/plugin-creator.png"
skills/.system/plugin-creator/references/plugin-json-spec.md
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# Plugin JSON sample spec
```json
{
"name": "plugin-name",
"version": "1.2.0",
"description": "Brief plugin description",
"author": {
"name": "Author Name",
"email": "author@example.com",
"url": "https://github.com/author"
},
"homepage": "https://docs.example.com/plugin",
"repository": "https://github.com/author/plugin",
"license": "MIT",
"keywords": ["keyword1", "keyword2"],
"skills": "./skills/",
"hooks": "./hooks.json",
"mcpServers": "./.mcp.json",
"apps": "./.app.json",
"interface": {
"displayName": "Plugin Display Name",
"shortDescription": "Short description for subtitle",
"longDescription": "Long description for details page",
"developerName": "OpenAI",
"category": "Productivity",
"capabilities": ["Interactive", "Write"],
"websiteURL": "https://openai.com/",
"privacyPolicyURL": "https://openai.com/policies/row-privacy-policy/",
"termsOfServiceURL": "https://openai.com/policies/row-terms-of-use/",
"defaultPrompt": [
"Summarize my inbox and draft replies for me.",
"Find open bugs and turn them into Linear tickets.",
"Review today's meetings and flag scheduling gaps."
],
"brandColor": "#3B82F6",
"composerIcon": "./assets/icon.png",
"logo": "./assets/logo.png",
"screenshots": [
"./assets/screenshot1.png",
"./assets/screenshot2.png",
"./assets/screenshot3.png"
]
}
}
```
## Field guide
### Top-level fields
- `name` (`string`): Plugin identifier (kebab-case, no spaces). Required if `plugin.json` is provided and used as manifest name and component namespace.
- `version` (`string`): Plugin semantic version.
- `description` (`string`): Short purpose summary.
- `author` (`object`): Publisher identity.
- `name` (`string`): Author or team name.
- `email` (`string`): Contact email.
- `url` (`string`): Author/team homepage or profile URL.
- `homepage` (`string`): Documentation URL for plugin usage.
- `repository` (`string`): Source code URL.
- `license` (`string`): License identifier (for example `MIT`, `Apache-2.0`).
- `keywords` (`array` of `string`): Search/discovery tags.
- `skills` (`string`): Relative path to skill directories/files.
- `hooks` (`string`): Hook config path.
- `mcpServers` (`string`): MCP config path.
- `apps` (`string`): App manifest path for plugin integrations.
- `interface` (`object`): Interface/UX metadata block for plugin presentation.
### `interface` fields
- `displayName` (`string`): User-facing title shown for the plugin.
- `shortDescription` (`string`): Brief subtitle used in compact views.
- `longDescription` (`string`): Longer description used on details screens.
- `developerName` (`string`): Human-readable publisher name.
- `category` (`string`): Plugin category bucket.
- `capabilities` (`array` of `string`): Capability list from implementation.
- `websiteURL` (`string`): Public website for the plugin.
- `privacyPolicyURL` (`string`): Privacy policy URL.
- `termsOfServiceURL` (`string`): Terms of service URL.
- `defaultPrompt` (`array` of `string`): Starter prompts shown in composer/UX context.
- Include at most 3 strings. Entries after the first 3 are ignored and will not be included.
- Each string is capped at 128 characters. Longer entries are truncated.
- Prefer short starter prompts around 50 characters so they scan well in the UI.
- `brandColor` (`string`): Theme color for the plugin card.
- `composerIcon` (`string`): Path to icon asset.
- `logo` (`string`): Path to logo asset.
- `screenshots` (`array` of `string`): List of screenshot asset paths.
- Screenshot entries must be PNG filenames and stored under `./assets/`.
- Keep file paths relative to plugin root.
### Path conventions and defaults
- Path values should be relative and begin with `./`.
- `skills`, `hooks`, and `mcpServers` are supplemented on top of default component discovery; they do not replace defaults.
- Custom path values must follow the plugin root convention and naming/namespacing rules.
- This repo’s scaffold writes `.codex-plugin/plugin.json`; treat that as the manifest location this skill generates.
# Marketplace JSON sample spec
`marketplace.json` depends on where the plugin should live:
- Repo plugin: `<repo-root>/.agents/plugins/marketplace.json`
- Local plugin: `~/.agents/plugins/marketplace.json`
```json
{
"name": "openai-curated",
"interface": {
"displayName": "ChatGPT Official"
},
"plugins": [
{
"name": "linear",
"source": {
"source": "local",
"path": "./plugins/linear"
},
"policy": {
"installation": "AVAILABLE",
"authentication": "ON_INSTALL"
},
"category": "Productivity"
}
]
}
```
## Marketplace field guide
### Top-level fields
- `name` (`string`): Marketplace identifier or catalog name.
- `interface` (`object`, optional): Marketplace presentation metadata.
- `plugins` (`array`): Ordered plugin entries. This order determines how Codex renders plugins.
### `interface` fields
- `displayName` (`string`, optional): User-facing marketplace title.
### Plugin entry fields
- `name` (`string`): Plugin identifier. Match the plugin folder name and `plugin.json` `name`.
- `source` (`object`): Plugin source descriptor.
- `source` (`string`): Use `local` for this repo workflow.
- `path` (`string`): Relative plugin path based on the marketplace root.
- Repo plugin: `./plugins/<plugin-name>`
- Local plugin in `~/.agents/plugins/marketplace.json`: `./plugins/<plugin-name>`
- The same relative path convention is used for both repo-rooted and home-rooted marketplaces.
- Example: with `~/.agents/plugins/marketplace.json`, `./plugins/<plugin-name>` resolves to `~/plugins/<plugin-name>`.
- `policy` (`object`): Marketplace policy block. Always include it.
- `installation` (`string`): Availability policy.
- Allowed values: `NOT_AVAILABLE`, `AVAILABLE`, `INSTALLED_BY_DEFAULT`
- Default for new entries: `AVAILABLE`
- `authentication` (`string`): Authentication timing policy.
- Allowed values: `ON_INSTALL`, `ON_USE`
- Default for new entries: `ON_INSTALL`
- `products` (`array` of `string`, optional): Product override for this plugin entry. Omit it unless product gating is explicitly requested.
- `category` (`string`): Display category bucket. Always include it.
### Marketplace generation rules
- `displayName` belongs under the top-level `interface` object, not individual plugin entries.
- When creating a new marketplace file from scratch, seed `interface.displayName` alongside top-level `name`.
- Always include `policy.installation`, `policy.authentication`, and `category` on every generated or updated plugin entry.
- Treat `policy.products` as an override and omit it unless explicitly requested.
- Append new entries unless the user explicitly requests reordering.
- Replace an existing entry for the same plugin only when overwrite is intentional.
- Choose marketplace location to match the plugin destination:
- Repo plugin: `<repo-root>/.agents/plugins/marketplace.json`
- Local plugin: `~/.agents/plugins/marketplace.json`
skills/.system/plugin-creator/scripts/create_basic_plugin.py
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#!/usr/bin/env python3
"""Scaffold a plugin directory and optionally update marketplace.json."""
from __future__ import annotations
import argparse
import json
import re
from pathlib import Path
from typing import Any
MAX_PLUGIN_NAME_LENGTH = 64
DEFAULT_PLUGIN_PARENT = Path.cwd() / "plugins"
DEFAULT_MARKETPLACE_PATH = Path.cwd() / ".agents" / "plugins" / "marketplace.json"
DEFAULT_INSTALL_POLICY = "AVAILABLE"
DEFAULT_AUTH_POLICY = "ON_INSTALL"
DEFAULT_CATEGORY = "Productivity"
DEFAULT_MARKETPLACE_DISPLAY_NAME = "[TODO: Marketplace Display Name]"
VALID_INSTALL_POLICIES = {"NOT_AVAILABLE", "AVAILABLE", "INSTALLED_BY_DEFAULT"}
VALID_AUTH_POLICIES = {"ON_INSTALL", "ON_USE"}
def normalize_plugin_name(plugin_name: str) -> str:
"""Normalize a plugin name to lowercase hyphen-case."""
normalized = plugin_name.strip().lower()
normalized = re.sub(r"[^a-z0-9]+", "-", normalized)
normalized = normalized.strip("-")
normalized = re.sub(r"-{2,}", "-", normalized)
return normalized
def validate_plugin_name(plugin_name: str) -> None:
if not plugin_name:
raise ValueError("Plugin name must include at least one letter or digit.")
if len(plugin_name) > MAX_PLUGIN_NAME_LENGTH:
raise ValueError(
f"Plugin name '{plugin_name}' is too long ({len(plugin_name)} characters). "
f"Maximum is {MAX_PLUGIN_NAME_LENGTH} characters."
)
def build_plugin_json(plugin_name: str) -> dict:
return {
"name": plugin_name,
"version": "[TODO: 1.2.0]",
"description": "[TODO: Brief plugin description]",
"author": {
"name": "[TODO: Author Name]",
"email": "[TODO: author@example.com]",
"url": "[TODO: https://github.com/author]",
},
"homepage": "[TODO: https://docs.example.com/plugin]",
"repository": "[TODO: https://github.com/author/plugin]",
"license": "[TODO: MIT]",
"keywords": ["[TODO: keyword1]", "[TODO: keyword2]"],
"skills": "[TODO: ./skills/]",
"hooks": "[TODO: ./hooks.json]",
"mcpServers": "[TODO: ./.mcp.json]",
"apps": "[TODO: ./.app.json]",
"interface": {
"displayName": "[TODO: Plugin Display Name]",
"shortDescription": "[TODO: Short description for subtitle]",
"longDescription": "[TODO: Long description for details page]",
"developerName": "[TODO: OpenAI]",
"category": "[TODO: Productivity]",
"capabilities": ["[TODO: Interactive]", "[TODO: Write]"],
"websiteURL": "[TODO: https://openai.com/]",
"privacyPolicyURL": "[TODO: https://openai.com/policies/row-privacy-policy/]",
"termsOfServiceURL": "[TODO: https://openai.com/policies/row-terms-of-use/]",
"defaultPrompt": [
"[TODO: Summarize my inbox and draft replies for me.]",
"[TODO: Find open bugs and turn them into tickets.]",
"[TODO: Review today's meetings and flag gaps.]",
],
"brandColor": "[TODO: #3B82F6]",
"composerIcon": "[TODO: ./assets/icon.png]",
"logo": "[TODO: ./assets/logo.png]",
"screenshots": [
"[TODO: ./assets/screenshot1.png]",
"[TODO: ./assets/screenshot2.png]",
"[TODO: ./assets/screenshot3.png]",
],
},
}
def build_marketplace_entry(
plugin_name: str,
install_policy: str,
auth_policy: str,
category: str,
) -> dict[str, Any]:
return {
"name": plugin_name,
"source": {
"source": "local",
"path": f"./plugins/{plugin_name}",
},
"policy": {
"installation": install_policy,
"authentication": auth_policy,
},
"category": category,
}
def load_json(path: Path) -> dict[str, Any]:
with path.open() as handle:
return json.load(handle)
def build_default_marketplace() -> dict[str, Any]:
return {
"name": "[TODO: marketplace-name]",
"interface": {
"displayName": DEFAULT_MARKETPLACE_DISPLAY_NAME,
},
"plugins": [],
}
def validate_marketplace_interface(payload: dict[str, Any]) -> None:
interface = payload.get("interface")
if interface is not None and not isinstance(interface, dict):
raise ValueError("marketplace.json field 'interface' must be an object.")
def update_marketplace_json(
marketplace_path: Path,
plugin_name: str,
install_policy: str,
auth_policy: str,
category: str,
force: bool,
) -> None:
if marketplace_path.exists():
payload = load_json(marketplace_path)
else:
payload = build_default_marketplace()
if not isinstance(payload, dict):
raise ValueError(f"{marketplace_path} must contain a JSON object.")
validate_marketplace_interface(payload)
plugins = payload.setdefault("plugins", [])
if not isinstance(plugins, list):
raise ValueError(f"{marketplace_path} field 'plugins' must be an array.")
new_entry = build_marketplace_entry(plugin_name, install_policy, auth_policy, category)
for index, entry in enumerate(plugins):
if isinstance(entry, dict) and entry.get("name") == plugin_name:
if not force:
raise FileExistsError(
f"Marketplace entry '{plugin_name}' already exists in {marketplace_path}. "
"Use --force to overwrite that entry."
)
plugins[index] = new_entry
break
else:
plugins.append(new_entry)
write_json(marketplace_path, payload, force=True)
def write_json(path: Path, data: dict, force: bool) -> None:
if path.exists() and not force:
raise FileExistsError(f"{path} already exists. Use --force to overwrite.")
path.parent.mkdir(parents=True, exist_ok=True)
with path.open("w") as handle:
json.dump(data, handle, indent=2)
handle.write("\n")
def create_stub_file(path: Path, payload: dict, force: bool) -> None:
if path.exists() and not force:
return
path.parent.mkdir(parents=True, exist_ok=True)
with path.open("w") as handle:
json.dump(payload, handle, indent=2)
handle.write("\n")
def parse_args() -> argparse.Namespace:
parser = argparse.ArgumentParser(
description="Create a plugin skeleton with placeholder plugin.json."
)
parser.add_argument("plugin_name")
parser.add_argument(
"--path",
default=str(DEFAULT_PLUGIN_PARENT),
help=(
"Parent directory for plugin creation (defaults to <cwd>/plugins). "
"When using a home-rooted marketplace, use <home>/plugins."
),
)
parser.add_argument("--with-skills", action="store_true", help="Create skills/ directory")
parser.add_argument("--with-hooks", action="store_true", help="Create hooks/ directory")
parser.add_argument("--with-scripts", action="store_true", help="Create scripts/ directory")
parser.add_argument("--with-assets", action="store_true", help="Create assets/ directory")
parser.add_argument("--with-mcp", action="store_true", help="Create .mcp.json placeholder")
parser.add_argument("--with-apps", action="store_true", help="Create .app.json placeholder")
parser.add_argument(
"--with-marketplace",
action="store_true",
help=(
"Create or update <cwd>/.agents/plugins/marketplace.json. "
"Marketplace entries always point to ./plugins/<plugin-name> relative to the "
"marketplace root."
),
)
parser.add_argument(
"--marketplace-path",
default=str(DEFAULT_MARKETPLACE_PATH),
help=(
"Path to marketplace.json (defaults to <cwd>/.agents/plugins/marketplace.json). "
"For a home-rooted marketplace, use <home>/.agents/plugins/marketplace.json."
),
)
parser.add_argument(
"--install-policy",
default=DEFAULT_INSTALL_POLICY,
choices=sorted(VALID_INSTALL_POLICIES),
help="Marketplace policy.installation value",
)
parser.add_argument(
"--auth-policy",
default=DEFAULT_AUTH_POLICY,
choices=sorted(VALID_AUTH_POLICIES),
help="Marketplace policy.authentication value",
)
parser.add_argument(
"--category",
default=DEFAULT_CATEGORY,
help="Marketplace category value",
)
parser.add_argument("--force", action="store_true", help="Overwrite existing files")
return parser.parse_args()
def main() -> None:
args = parse_args()
raw_plugin_name = args.plugin_name
plugin_name = normalize_plugin_name(raw_plugin_name)
if plugin_name != raw_plugin_name:
print(f"Note: Normalized plugin name from '{raw_plugin_name}' to '{plugin_name}'.")
validate_plugin_name(plugin_name)
plugin_root = (Path(args.path).expanduser().resolve() / plugin_name)
plugin_root.mkdir(parents=True, exist_ok=True)
plugin_json_path = plugin_root / ".codex-plugin" / "plugin.json"
write_json(plugin_json_path, build_plugin_json(plugin_name), args.force)
optional_directories = {
"skills": args.with_skills,
"hooks": args.with_hooks,
"scripts": args.with_scripts,
"assets": args.with_assets,
}
for folder, enabled in optional_directories.items():
if enabled:
(plugin_root / folder).mkdir(parents=True, exist_ok=True)
if args.with_mcp:
create_stub_file(
plugin_root / ".mcp.json",
{"mcpServers": {}},
args.force,
)
if args.with_apps:
create_stub_file(
plugin_root / ".app.json",
{
"apps": {},
},
args.force,
)
if args.with_marketplace:
marketplace_path = Path(args.marketplace_path).expanduser().resolve()
update_marketplace_json(
marketplace_path,
plugin_name,
args.install_policy,
args.auth_policy,
args.category,
args.force,
)
print(f"Created plugin scaffold: {plugin_root}")
print(f"plugin manifest: {plugin_json_path}")
if args.with_marketplace:
print(f"marketplace manifest: {marketplace_path}")
if __name__ == "__main__":
main()