Hook Development for Claude Code Plugins
anthropics/claude-plugins-official
Explains how to write Claude Code plugin hooks, both prompt-based checks and bash commands, for events such as PreToolUse, Stop and SessionStart.
Create and scaffold plugin directories for Codex with a required .codex-plugin/plugin.json, optional plugin folders/files, valid manifest defaults, and personal-marketplace entries by default.
Install Plugin Creator
The automated check flagged lines worth reading first. See the safety section below.
$ npx skills add theowenyoung/home --skill plugin-creator -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install theowenyoung/home plugin-creator --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/theowenyoung/home.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.codex/skills/.system/plugin-creator .claude/skills/plugin-creator && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "plugin-creator" agent skill from https://github.com/theowenyoung/home/tree/main/.codex/skills/.system/plugin-creator into .claude/skills/plugin-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-creator", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/theowenyoung/home/tree/main/.codex/skills/.system/plugin-creatorType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add theowenyoung/home --skill plugin-creator -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install theowenyoung/home plugin-creator --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/theowenyoung/home.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.codex/skills/.system/plugin-creator .agents/skills/plugin-creator && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "plugin-creator" agent skill from https://github.com/theowenyoung/home/tree/main/.codex/skills/.system/plugin-creator into .agents/skills/plugin-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-creator", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add theowenyoung/home --skill plugin-creator -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install theowenyoung/home plugin-creator --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/theowenyoung/home.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.codex/skills/.system/plugin-creator .cursor/skills/plugin-creator && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "plugin-creator" agent skill from https://github.com/theowenyoung/home/tree/main/.codex/skills/.system/plugin-creator into .cursor/skills/plugin-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-creator", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/theowenyoung/home.git --path .codex/skills/.system/plugin-creator--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add theowenyoung/home --skill plugin-creator -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install theowenyoung/home plugin-creator --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/theowenyoung/home.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.codex/skills/.system/plugin-creator .gemini/skills/plugin-creator && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "plugin-creator" agent skill from https://github.com/theowenyoung/home/tree/main/.codex/skills/.system/plugin-creator into .gemini/skills/plugin-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-creator", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install theowenyoung/home plugin-creatorInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add theowenyoung/home --skill plugin-creator -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/theowenyoung/home.git skills-src && mkdir -p .github/skills && cp -r skills-src/.codex/skills/.system/plugin-creator .github/skills/plugin-creator && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "plugin-creator" agent skill from https://github.com/theowenyoung/home/tree/main/.codex/skills/.system/plugin-creator into .github/skills/plugin-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-creator", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add theowenyoung/home --skill plugin-creator -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install theowenyoung/home plugin-creator --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/theowenyoung/home.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.codex/skills/.system/plugin-creator .opencode/skills/plugin-creator && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "plugin-creator" agent skill from https://github.com/theowenyoung/home/tree/main/.codex/skills/.system/plugin-creator into .opencode/skills/plugin-creator/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "plugin-creator", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
plugin-creator- GitHub stars
- 115
- Used in
- 2 other repos
- Token cost
- ~2.9k tokens
- SKILL.md length
- 1,119 words
- Files
- 11 (incl. scripts, references, assets)
- Skills in repo
- 7
- Repo updated
- First seen
- Licence
- None found
At a glance
Create and scaffold plugin directories for Codex with a required .codex-plugin/plugin.json, optional plugin folders/files, valid manifest defaults, and personal-marketplace entries by default.
- Works in 3 steps: Run the scaffold script → Edit /.codex-plugin/plugin.json when the… → Generate or update the personal…
- Codex needs to create a new personal plugin
- SKILL.md covers Quick Start, What this skill creates, Marketplace workflow and Required behavior, plus 2 more sections
- Runs Python scripts from its folder; calls python3 and codex
What it does
Plugin Creator is an agent skill from theowenyoung/home. Create and scaffold plugin directories for Codex with a required .codex-plugin/plugin.json, optional plugin folders/files, valid manifest defaults, and personal-marketplace entries by default. Use when Codex needs to create a new personal plugin, add optional plugin structure, generate or update marketplace entries for plugin ordering and availability metadata, or update an existing local plugin during development with the CLI-driven cachebuster and reinstall flow.
Its SKILL.md is about 2.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 14 other files, including scripts, reference files and assets (for example `agents/openai.yaml`, `references/installing-and-updating.md` and `references/plugin-json-spec.md`).
It sits in Agent Workflows, covering Hooks and plugins.
When your agent uses it
- Codex needs to create a new personal plugin
- Add optional plugin structure
- Update marketplace entries for plugin ordering and availability metadata
- Update an existing local plugin during development with the CLI-driven cachebuster and reinstall flow
Example prompts
- “/plugin-creator”
Requirements
- Python 3
Workflow steps
3 steps, taken from the first numbered list in SKILL.md.
- Run the scaffold script
- Edit /.codex-plugin/plugin.json when the request gives specific metadata.
- Generate or update the personal marketplace entry when the plugin should appear in Codex UI ordering
What it can do on your machine
Read from SKILL.md and the folder at commit 9bf3ea9. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 5 files in scripts/ (Python), which the agent can run.
Shell commands in SKILL.md call:
python3codex
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Plugin Creator loads about 2.9k tokens when it runs, and up to ~6.7k if it reads all its reference files. Until then it costs about 122 tokens; SKILL.md has 1,119 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check: warnings
The automated check found patterns that need a careful read before installing.
- WarningContains instruction-override wording (e.g. “without asking the user”)SKILL.md:210
- Do not tell the user to run `codex plugin marketplace add` for the default personal-marketplace
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); the scripts in this folder are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 1,119 words (~2,866 tokens).
“The scaffold starts with valid defaults and must not contain [TODO: ...] placeholders.”
- name
- plugin-creator
Files
SKILL.md and 10 other files (scripts, references, assets) in .codex/skills/.system/plugin-creator of theowenyoung/home.
- SKILL.md
- agents/openai.yaml
- assets/plugin-creator-small.svg
- assets/plugin-creator.png
- references/installing-and-updating.md
- references/plugin-json-spec.md
- scripts/create_basic_plugin.py
- scripts/identifier_validation.py
- scripts/read_marketplace_name.py
- scripts/update_plugin_cachebuster.py
- scripts/validate_plugin.py
Open the folder on GitHubat commit 9bf3ea9
Used in 2 other repositories
We found 2 copies of this SKILL.md (exact, near-identical or edited) in other folders, from 2 other GitHub owners. This page covers the copy in theowenyoung/home, which our catalogue first saw on October 7, 2026.
Compare with similar skills
Plugin Creator next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Plugin Creator this skilltheowenyoung/home | 115 | 2 repos | ~2.9k | Automated safety check: Warn | None | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 37k | 11 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Claude Code Agent Developmentanthropics/claude-plugins-official | 37k | 8 repos | ~2.8k | Automated safety check: Pass | Apache-2.0 | |
| Claude Code Skill Developer Guidediet103/claude-code-infrastructure-showcase | 10k | 10 repos | ~3.5k | Automated safety check: Pass | MIT | |
| Plugin Settings Patternanthropics/claude-plugins-official | 37k | 7 repos | ~3k | Automated safety check: Pass | Apache-2.0 | |
| MCP Integration for Pluginsanthropics/claude-plugins-official | 37k | 11 repos | ~3.1k | Automated safety check: Pass | Apache-2.0 |
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Related
Categories
Questions about Plugin Creator
What does Plugin Creator do?
Create and scaffold plugin directories for Codex with a required .codex-plugin/plugin.json, optional plugin folders/files, valid manifest defaults, and personal-marketplace entries by default. Plugin Creator is an agent skill from theowenyoung/home.json, optional plugin folders/files, valid manifest defaults, and personal-marketplace entries by default.
When should I use Plugin Creator?
Plugin Creator fits situations like: Codex needs to create a new personal plugin; add optional plugin structure; update marketplace entries for plugin ordering and availability metadata; update an existing local plugin during development with the CLI-driven cachebuster and reinstall flow.
How do I install Plugin Creator in Claude Code?
Run `npx skills add theowenyoung/home --skill plugin-creator -a claude-code`. Or copy the skill folder (.codex/skills/.system/plugin-creator in theowenyoung/home) into .claude/skills/plugin-creator in your project. Claude Code loads it when a task matches its description.
How do I install Plugin Creator in Codex?
Run `npx skills add theowenyoung/home --skill plugin-creator -a codex`. Or copy the skill folder (.codex/skills/.system/plugin-creator in theowenyoung/home) into .agents/skills/plugin-creator in your project. Codex loads it when a task matches its description.
Can I use Plugin Creator in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add theowenyoung/home --skill plugin-creator -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/plugin-creator, .gemini/skills/plugin-creator, .github/skills/plugin-creator and .opencode/skills/plugin-creator in your project.
What does Plugin Creator need to run?
Going by SKILL.md and its folder, Plugin Creator needs Python for the scripts in its folder and the command-line tools its instructions call (python3 and codex). Our summary lists: Python 3.
Does Plugin Creator access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Plugin Creator safe to install?
Our automated static check of SKILL.md flagged 1 warning(s): contains instruction-override wording (e.g. “without asking the user”). Read the flagged lines before installing; the check is not a guarantee either way. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Plugin Creator use?
No licence was found for Plugin Creator or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Plugin Creator use?
About 2.9k tokens (SKILL.md is roughly 11k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 3.8k tokens, read only when the agent opens those files.
What are the alternatives to Plugin Creator?
Skills that share tags, products or a category with Plugin Creator: Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 37k stars), Claude Code Agent Development (anthropics/claude-plugins-official, 37k stars), Claude Code Skill Developer Guide (diet103/claude-code-infrastructure-showcase, 10k stars) and Plugin Settings Pattern (anthropics/claude-plugins-official, 37k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Plugin Creator?
theowenyoung (a GitHub user) maintains it in theowenyoung/home, which has 115 GitHub stars. The repository holds 7 skills in this directory. The repository was last updated on September 27, 2026.
Source: theowenyoung/home on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.