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.
Expert at creating and managing Claude Code plugins that bundle agents, skills, commands, and hooks into cohesive packages.
Install Building Plugins
$ npx skills add aiskillstore/marketplace --skill building-plugins -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install aiskillstore/marketplace building-plugins --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/aiskillstore/marketplace.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/c0ntr0lledcha0s/building-plugins .claude/skills/building-plugins && 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 "building-plugins" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/building-plugins into .claude/skills/building-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-plugins", 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/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/building-pluginsType 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 aiskillstore/marketplace --skill building-plugins -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install aiskillstore/marketplace building-plugins --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/c0ntr0lledcha0s/building-plugins .agents/skills/building-plugins && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "building-plugins" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/building-plugins into .agents/skills/building-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-plugins", 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 aiskillstore/marketplace --skill building-plugins -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install aiskillstore/marketplace building-plugins --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/c0ntr0lledcha0s/building-plugins .cursor/skills/building-plugins && 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 "building-plugins" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/building-plugins into .cursor/skills/building-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-plugins", 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/aiskillstore/marketplace.git --path skills/c0ntr0lledcha0s/building-plugins--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 aiskillstore/marketplace --skill building-plugins -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install aiskillstore/marketplace building-plugins --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/c0ntr0lledcha0s/building-plugins .gemini/skills/building-plugins && 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 "building-plugins" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/building-plugins into .gemini/skills/building-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-plugins", 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 aiskillstore/marketplace building-pluginsInstalls 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 aiskillstore/marketplace --skill building-plugins -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/c0ntr0lledcha0s/building-plugins .github/skills/building-plugins && 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 "building-plugins" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/building-plugins into .github/skills/building-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-plugins", 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 aiskillstore/marketplace --skill building-plugins -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install aiskillstore/marketplace building-plugins --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/aiskillstore/marketplace.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/c0ntr0lledcha0s/building-plugins .opencode/skills/building-plugins && 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 "building-plugins" agent skill from https://github.com/aiskillstore/marketplace/tree/main/skills/c0ntr0lledcha0s/building-plugins into .opencode/skills/building-plugins/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "building-plugins", 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
building-plugins- GitHub stars
- 430
- Token cost
- ~6.7k tokens
- SKILL.md length
- 1,842 words
- Files
- 20 (incl. scripts, references)
- Skills in repo
- 1,108
- Repo updated
- First seen
- Licence
- None found
At a glance
Expert at creating and managing Claude Code plugins that bundle agents, skills, commands, and hooks into cohesive packages.
- Works in 9 steps: Gather Requirements → Design Plugin Architecture → Create Directory Structure → …
- Wants to create
- SKILL.md covers What is a Plugin?, When to Create a Plugin vs…, Plugin Creation Process and Plugin Structure & Schema, plus 8 more sections
- Runs Python and Shell scripts from its folder; calls python3 and claude; reaches github.com; needs API_KEY
What it does
Building Plugins is an agent skill from aiskillstore/marketplace. Expert at creating and managing Claude Code plugins that bundle agents, skills, commands, and hooks into cohesive packages. Auto-invokes when the user wants to create, structure, validate, or publish a complete plugin, or needs help with plugin architecture and best practices. Also auto-invokes proactively when Claude is about to create plugin directory structures, write plugin.json manifests, or implement tasks that involve bundling components into a plugin package.
Its SKILL.md is about 6.7k tokens, which your agent loads only when the skill is triggered. The skill folder holds 29 other files, including scripts and reference files (for example `references/plugin-architecture-guide.md`, `references/plugin-distribution-guide.md` and `scripts/validate-plugin.py`).
It sits in Agent Workflows, covering Hooks and plugins. The repository describes itself as: Security-audited skills for Claude, Codex & Claude Code. One-click install, quality verified.
When your agent uses it
- Wants to create
- Publish a complete plugin
- Needs help with plugin architecture and best practices
Example prompts
- “/building-plugins”
Requirements
- Python 3
- A Bash shell
- A credential in API_KEY
- Pre-approved tools (allowed-tools): Read, Write, Edit, Grep, Glob, Bash
Workflow steps
9 steps, taken from the step headings in SKILL.md.
- Gather Requirements
- Design Plugin Architecture
- Create Directory Structure
- Create plugin.json Manifest
- Create Components
- Write Comprehensive README.md
- Validate the Plugin
- Test the Plugin
- Document Usage
What it can do on your machine
Read from SKILL.md and the folder at commit ad8daf7. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves these tools, so the agent can use them without asking each time:
ReadWriteEditGrepGlobBash
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships 1 file in scripts/ (Python and Shell, from the files we listed), which the agent can run.
Shell commands in SKILL.md call:
python3claude
From the folder's file list and the shell code blocks in SKILL.md.
Network
Hosts in commands or code, which the agent is likely to contact:
github.com
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Building Plugins loads about 6.7k tokens when it runs, and up to ~13k if it reads all its reference files. Until then it costs about 122 tokens; SKILL.md has 1,842 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: notes
The automated check noted patterns worth knowing about, such as sudo or a known installer.
- NoteMentions a .env fileSKILL.md:717
- Add `.env` to `.gitignore` - NotePre-approves every shell command (allowed-tools: Bash)SKILL.md
allowed-tools: Read, Write, Edit, Grep, Glob, Bash
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 1,842 words (~6,688 tokens).
“You are an expert at creating Claude Code plugins. Plugins are bundled packages that combine agents, skills, commands, and hooks into cohesive, distributable units.”
- name
- building-plugins
- allowed-tools
- Read, Write, Edit, Grep, Glob, Bash
- version
- 2.0.0
Files
SKILL.md and 19 other files (scripts, references) in skills/c0ntr0lledcha0s/building-plugins of aiskillstore/marketplace.
- SKILL.md
- references/plugin-architecture-guide.md
- references/plugin-distribution-guide.md
- scripts/validate-plugin.py
- skill-report.json
- templates/full-plugin-template/hooks/hooks.json
- templates/full-plugin-template/hooks/scripts/validate-bash.sh
- templates/full-plugin-template/skills/example-skill/SKILL.md
- templates/minimal-plugin-template/README.md
- templates/minimal-plugin-template/commands/example.md
- templates/plugin-readme-template.md
- … and 9 more
Open the folder on GitHubat commit ad8daf7
Compare with similar skills
Building Plugins 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 |
|---|---|---|---|---|---|---|
| Building Plugins this skillaiskillstore/marketplace | 430 | — | ~6.7k | Automated safety check: Notes | None | |
| Hook Development for Claude Code Pluginsanthropics/claude-plugins-official | 38k | 11 repos | ~4.1k | Automated safety check: Notes | Apache-2.0 | |
| Claude Code Agent Developmentanthropics/claude-plugins-official | 38k | 8 repos | ~2.8k | Automated safety check: Pass | Apache-2.0 | |
| Claude Code Skill Developer Guidediet103/claude-code-infrastructure-showcase | 10k | 11 repos | ~3.5k | Automated safety check: Pass | MIT | |
| Plugin Settings Patternanthropics/claude-plugins-official | 38k | 7 repos | ~3k | Automated safety check: Pass | Apache-2.0 | |
| MCP Integration for Pluginsanthropics/claude-plugins-official | 38k | 11 repos | ~3.1k | Automated safety check: Pass | Apache-2.0 |
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Related
Categories
Questions about Building Plugins
What does Building Plugins do?
Expert at creating and managing Claude Code plugins that bundle agents, skills, commands, and hooks into cohesive packages. Building Plugins is an agent skill from aiskillstore/marketplace. Expert at creating and managing Claude Code plugins that bundle agents, skills, commands, and hooks into cohesive packages.
When should I use Building Plugins?
Building Plugins fits situations like: wants to create; publish a complete plugin; needs help with plugin architecture and best practices.
How do I install Building Plugins in Claude Code?
Run `npx skills add aiskillstore/marketplace --skill building-plugins -a claude-code`. Or copy the skill folder (skills/c0ntr0lledcha0s/building-plugins in aiskillstore/marketplace) into .claude/skills/building-plugins in your project. Claude Code loads it when a task matches its description.
How do I install Building Plugins in Codex?
Run `npx skills add aiskillstore/marketplace --skill building-plugins -a codex`. Or copy the skill folder (skills/c0ntr0lledcha0s/building-plugins in aiskillstore/marketplace) into .agents/skills/building-plugins in your project. Codex loads it when a task matches its description.
Can I use Building Plugins 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 aiskillstore/marketplace --skill building-plugins -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/building-plugins, .gemini/skills/building-plugins, .github/skills/building-plugins and .opencode/skills/building-plugins in your project.
What does Building Plugins need to run?
Going by SKILL.md and its folder, Building Plugins needs Python and a shell for the scripts in its folder, the command-line tools its instructions call (python3 and claude) and credentials named API_KEY. Our summary lists: Python 3; A Bash shell; A credential in API_KEY. Its frontmatter pre-approves these tools: Read, Write, Edit, Grep, Glob, Bash.
Does Building Plugins access the network?
SKILL.md names 1 domain. In commands or code: github.com; the agent is likely to contact it when it follows the instructions. This is read from the text; nothing was executed.
Is Building Plugins safe to install?
Our automated static check of SKILL.md found notes only (mentions a .env file; pre-approves every shell command (allowed-tools: bash)), nothing it rates as a warning. It is not a guarantee. The check reads SKILL.md only: the scripts in the folder are not scanned, so read them before running anything.
What licence does Building Plugins use?
No licence was found for Building Plugins or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Building Plugins use?
About 6.7k tokens (SKILL.md is roughly 27k 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 6.1k tokens, read only when the agent opens those files.
What are the alternatives to Building Plugins?
Skills that share tags, products or a category with Building Plugins: Hook Development for Claude Code Plugins (anthropics/claude-plugins-official, 38k stars), Claude Code Agent Development (anthropics/claude-plugins-official, 38k stars), Claude Code Skill Developer Guide (diet103/claude-code-infrastructure-showcase, 10k stars) and Plugin Settings Pattern (anthropics/claude-plugins-official, 38k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Building Plugins?
aiskillstore (a GitHub organization) maintains it in aiskillstore/marketplace, which has 430 GitHub stars. The repository holds 1,108 skills in this directory. The repository was last updated on October 7, 2026.
Source: aiskillstore/marketplace on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.