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Agent skill

Commandkit Plugin Development

by neplexlabs in neplexlabs/commandkit

Create CommandKit plugins for runtime and compiler extension points.

MITAuto-check passedAgent Workflows

Install Commandkit Plugin Development

skills CLI
$ npx skills add neplexlabs/commandkit --skill commandkit-plugin-development -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install neplexlabs/commandkit commandkit-plugin-development --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/neplexlabs/commandkit.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/commandkit-plugin-development .claude/skills/commandkit-plugin-development && rm -rf skills-src

Use ~/.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/

Facts

Skill name
commandkit-plugin-development
GitHub stars
165
Token cost
~709 tokens
SKILL.md length
188 words
Files
10 (incl. references)
Skills in repo
13
Repo updated
First seen
Licence
MIT

At a glance

Create CommandKit plugins for runtime and compiler extension points.

  • Works in 4 steps: Decide plugin type: runtime vs compiler. → Implement focused plugin class with… → Register plugin in config and validate… → …
  • Implementing RuntimePlugin hooks
  • SKILL.md covers Activation guidance, Required filesystem expectations, Execution workflow and Guardrails, plus 2 more sections
  • Runs JavaScript scripts from its folder

What it does

Commandkit Plugin Development is an agent skill from neplexlabs/commandkit. Create CommandKit plugins for runtime and compiler extension points. Use when implementing RuntimePlugin hooks, CompilerPlugin transforms, template registration, or rolldownPlugins-based compiler customization.

Its SKILL.md is about 710 tokens, which your agent loads only when the skill is triggered. The skill folder holds 11 other files, including reference files (for example `README.md`, `references/00-filesystem-structure.md` and `references/01-runtime-plugin-basics.md`).

It sits in Agent Workflows, covering Hooks and plugins. The repository describes itself as: The discord.js meta-framework with features such as AI-powered command handler, analytics, feature flags, and more. The licence is MIT.

When your agent uses it

  • Implementing RuntimePlugin hooks
  • CompilerPlugin transforms
  • Template registration
  • RolldownPlugins-based compiler customization

Example prompts

  • “/commandkit-plugin-development”

Requirements

  • Node.js

Workflow steps

4 steps, taken from the first numbered list in SKILL.md.

  1. Decide plugin type: runtime vs compiler.
  2. Implement focused plugin class with explicit hook usage.
  3. Register plugin in config and validate lifecycle behavior.
  4. Add logging/tests for hook behavior and failure modes.

What it can do on your machine

Read from SKILL.md and the folder at commit d771e6b. 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 script files (JavaScript), which the agent can run.

    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

Commandkit Plugin Development loads about 709 tokens when it runs, and up to ~2.8k if it reads all its reference files. Until then it costs about 60 tokens; SKILL.md has 188 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~60
When it runs · the whole SKILL.md, loaded when a task matches
~709
With references · SKILL.md plus every file in references/, read only if the agent opens them
~2.8k

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 passed

The automated check found no risky patterns in SKILL.md.

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); files beside SKILL.md are not scanned.

SKILL.md

The full file from neplexlabs/commandkit at commit d771e6b, republished under its MIT licence (© neplexlabs). 188 words, ~709 tokens.

Download SKILL.mdSave it as .claude/skills/commandkit-plugin-development/SKILL.md (or your agent's skills folder). This skill also uses 9 other files; get the full folder from GitHub.
name
commandkit-plugin-development
description
Create CommandKit plugins for runtime and compiler extension points. Use when implementing RuntimePlugin hooks, CompilerPlugin transforms, template registration, or rolldownPlugins-based compiler customization.
version
1.0.0
author
neplextech
emoji
🧩
tags
commandkit, plugins, runtime-plugin, compiler-plugin, rolldown

CommandKit Plugin Development

Activation guidance

Use when building custom plugins that modify CommandKit runtime behavior, command registration flow, or source compilation.

Required filesystem expectations

  • plugin source files in project plugin directory (for example src/plugins/**)
  • plugin wiring in commandkit.config.ts
  • optional template output targets under application source tree

Execution workflow

  1. Decide plugin type: runtime vs compiler.
  2. Implement focused plugin class with explicit hook usage.
  3. Register plugin in config and validate lifecycle behavior.
  4. Add logging/tests for hook behavior and failure modes.

Guardrails

  • Keep plugin scope narrow and explicit.
  • Avoid heavy side effects in hot hooks.
  • For compiler plugins, preserve code correctness and source maps when transforming.

Reference index

NameDescription
references/00-filesystem-structure.mdPlugin folder layout and config wiring expectations.
references/01-runtime-plugin-basics.mdRuntimePlugin class setup and minimal lifecycle hook usage.
references/02-runtime-hooks-reference.mdPractical mapping of major runtime hooks and when to use each.
references/03-compiler-plugin-transform.mdCompilerPlugin transform pipeline and safe transform patterns.
references/04-template-registration.mdRegistering/unregistering commandkit create templates in compiler plugins.
references/05-rolldown-plugins.mdUsing rolldownPlugins in config for compiler-time extension.

Tool index

NameDescription
tools/generate-runtime-plugin-template.mjsPrints a minimal RuntimePlugin template with typed hook signatures.
tools/generate-compiler-plugin-template.mjsPrints a minimal CompilerPlugin template including transform method skeleton.

© neplexlabs, MIT. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 9 other files (references) in skills/commandkit-plugin-development of neplexlabs/commandkit.

  • SKILL.md
  • README.md
  • references/00-filesystem-structure.md
  • references/01-runtime-plugin-basics.md
  • references/02-runtime-hooks-reference.md
  • references/03-compiler-plugin-transform.md
  • references/04-template-registration.md
  • references/05-rolldown-plugins.md
  • tools/generate-compiler-plugin-template.mjs
  • tools/generate-runtime-plugin-template.mjs

Open the folder on GitHubat commit d771e6b

Compare with similar skills

Commandkit Plugin Development 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.

Commandkit Plugin Development compared with similar skills
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Commandkit Plugin Development this skillneplexlabs/commandkit165—~709Automated safety check: PassMIT
Hook Development for Claude Code Pluginsanthropics/claude-plugins-official37k11 repos~4.1kAutomated safety check: NotesApache-2.0
Claude Code Agent Developmentanthropics/claude-plugins-official37k8 repos~2.8kAutomated safety check: PassApache-2.0
Claude Code Skill Developer Guidediet103/claude-code-infrastructure-showcase10k10 repos~3.5kAutomated safety check: PassMIT
Plugin Settings Patternanthropics/claude-plugins-official37k7 repos~3kAutomated safety check: PassApache-2.0
MCP Integration for Pluginsanthropics/claude-plugins-official37k11 repos~3.1kAutomated safety check: PassApache-2.0

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Categories

Questions about Commandkit Plugin Development

What does Commandkit Plugin Development do?

Create CommandKit plugins for runtime and compiler extension points. Commandkit Plugin Development is an agent skill from neplexlabs/commandkit. Create CommandKit plugins for runtime and compiler extension points.

When should I use Commandkit Plugin Development?

Commandkit Plugin Development fits situations like: implementing RuntimePlugin hooks; compilerPlugin transforms; template registration; rolldownPlugins-based compiler customization.

How do I install Commandkit Plugin Development in Claude Code?

Run `npx skills add neplexlabs/commandkit --skill commandkit-plugin-development -a claude-code`. Or copy the skill folder (skills/commandkit-plugin-development in neplexlabs/commandkit) into .claude/skills/commandkit-plugin-development in your project. Claude Code loads it when a task matches its description.

How do I install Commandkit Plugin Development in Codex?

Run `npx skills add neplexlabs/commandkit --skill commandkit-plugin-development -a codex`. Or copy the skill folder (skills/commandkit-plugin-development in neplexlabs/commandkit) into .agents/skills/commandkit-plugin-development in your project. Codex loads it when a task matches its description.

Can I use Commandkit Plugin Development 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 neplexlabs/commandkit --skill commandkit-plugin-development -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/commandkit-plugin-development, .gemini/skills/commandkit-plugin-development, .github/skills/commandkit-plugin-development and .opencode/skills/commandkit-plugin-development in your project.

What does Commandkit Plugin Development need to run?

Going by SKILL.md and its folder, Commandkit Plugin Development needs JavaScript for the scripts in its folder. Our summary lists: Node.js.

Does Commandkit Plugin Development 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 Commandkit Plugin Development safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Commandkit Plugin Development use?

Commandkit Plugin Development is published under the MIT licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Commandkit Plugin Development use?

About 709 tokens (SKILL.md is roughly 2.8k 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 2.1k tokens, read only when the agent opens those files.

What are the alternatives to Commandkit Plugin Development?

Skills that share tags, products or a category with Commandkit Plugin Development: 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 Commandkit Plugin Development?

neplexlabs (a GitHub organization) maintains it in neplexlabs/commandkit, which has 165 GitHub stars. The repository holds 13 skills in this directory. The repository was last updated on September 26, 2026.

Source: neplexlabs/commandkit on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.