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plugin-creator

plugin-creator is a skill for Codex from PracticalSwan/agent-skills. It costs 86 tokens per session (3,186 once invoked), scanned A, a copy of plugin-creator, MIT.

A scaffold for creating Codex plugins with the required manifest and optional supporting folders and files.

In plain words
What is it for?
Use it to start a plugin, validate its layout, update marketplace entries, and manage development reinstalls.
Why use it?
It removes the need to work out the expected plugin structure and metadata by hand.

Skill for Codex

Written for Codex: agents/openai.yaml present. Also seen: mentions Claude Code; mentions Codex.

Needs its repository: it reads a path above its own folder, which exists only inside the repository. The line is python3 ../skill-creator/scripts/quick_validate.py ..

not rated 14repo +1 changed 3d ago A scan 86 tokens copy · 88% MIT

Good fit Use it to start a plugin, validate its layout, update marketplace entries, and manage development reinstalls.

Compare 6 skills from other repositories ↓
View source ↗ PracticalSwan/agent-skills
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/PracticalSwan/agent-skills
agentmods
npx agentmods add skills/practicalswan/agent-skills/plugin-creator

Made for: Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for plugin-creator

README.md
[![agentmods](https://agentmods.dev/badge/skills/practicalswan/agent-skills/plugin-creator/github.svg)](https://agentmods.dev/skills/practicalswan/agent-skills/plugin-creator)
Your own site
<a href="https://agentmods.dev/skills/practicalswan/agent-skills/plugin-creator"><img src="https://agentmods.dev/badge/skills/practicalswan/agent-skills/plugin-creator/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for plugin-creator

Your own site · 80×15
<a href="https://agentmods.dev/skills/practicalswan/agent-skills/plugin-creator"><img src="https://agentmods.dev/badge/skills/practicalswan/agent-skills/plugin-creator.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 86 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,186 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin 88% copy Near-identical to another mod in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00086 $0.03186
Opus 5 $0.00043 $0.01593
Sonnet 5 $0.00017 $0.00637
Haiku 4.5 $0.00009 $0.00319

Measured 3d ago against content hash 00b510643e9f, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-10, from the pricing page.

Security

Grade A, and why

plugin-creator scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

The scan reads SKILL.md. This mod also ships 4 executable files (scripts/create_basic_plugin.py, scripts/read_marketplace_name.py, scripts/update_plugin_cachebuster.py, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

Origin

This is a copy

88% identical to plugin-creator — 84 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

plugin-creator/SKILL.md · 312 lines

How it starts

The opening of the file, as written. The whole thing — 312 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Plugin Creator

Host boundary

This skill creates Codex plugins. It remains usable from Claude Code or GitHub Copilot when the requested artifact is a Codex plugin, but its .codex-plugin/plugin.json, marketplace, cachebuster, reinstall, and deeplink rules must not be presented as native formats for those hosts.

  • In Codex, follow the complete scaffold, validation, marketplace, and app handoff workflow below.
  • In Claude Code, including GLM-backed sessions, use this skill only to author or validate a Codex-targeted plugin. If the user wants a Claude Code plugin, switch to Claude Code's current official plugin documentation and its native manifest/layout instead of running these Codex scaffold scripts.
  • Do not infer Codex CLI or app availability from the model endpoint. When a non-Codex host authors the files, report any Codex-only installation or UI verification as pending until it is checked in Codex.

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 the skill root (the directory containing this `SKILL.md`).
# By default creates in `~/plugins/<plugin-name>`.
python3 scripts/create_basic_plugin.py <plugin-name>

  1. Edit <plugin-path>/.codex-plugin/plugin.json when the request gives specific metadata. The scaffold starts with valid defaults and must not contain [TODO: ...] placeholders.

  2. Generate or update the personal marketplace entry when the plugin should appear in Codex UI ordering:

# Personal marketplace entries default to `~/.agents/plugins/marketplace.json`.
python3 scripts/create_basic_plugin.py my-plugin --with-marketplace

Only specify --marketplace-name <name> when the default personal marketplace name is already taken or installed and you need to seed a different new marketplace file:

python3 scripts/create_basic_plugin.py my-plugin \
  --with-marketplace \
  --marketplace-name team-local

Read the full file on GitHub · 312 lines

Files

What ships with it

10 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago Changed 00b510643e9f
  2. 4d ago Changed 56b189d49267
  3. 7d ago First seen · 312 lines · 86 tokens per session scan A 8ec751e88813

Subscribe to this mod's changes

plugin-creator is a skill published in the GitHub repository PracticalSwan/agent-skills (14 stars, last pushed 3d ago), licensed MIT. It adds 86 tokens to every session and 3,186 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to plugin-creator, differing in 84 lines, and is treated as a copy.

Building agentscreatorplugin
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