A copy-and-customise component library for React, a JavaScript interface framework. Its components are copied into your project with the shadcn command-line tool and use React Aria, Tailwind CSS, and CVA.

Use it to add or compose interface elements such as buttons, dialogs, forms, menus, calendars, charts, and date pickers in React applications.

It provides ready-made interface building blocks while leaving their source code in your project to change. The components include accessibility support and reusable style variations.

kanpeki — Skill for Claude Code and Codex by fellipeutaka/leon

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent

npx skills add fellipeutaka/leon --skill kanpeki

Clone the repo

git clone --depth 1 https://github.com/fellipeutaka/leon

Made for: Claude Code, Codex.

Or install frontend, the plugin that ships this one along with the rest of its 35 skills.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/fellipeutaka/leon/kanpeki/github.svg)](https://agentmods.dev/skills/fellipeutaka/leon/kanpeki)

Your own site

<a href="https://agentmods.dev/skills/fellipeutaka/leon/kanpeki"><img src="https://agentmods.dev/badge/skills/fellipeutaka/leon/kanpeki/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/fellipeutaka/leon/kanpeki"><img src="https://agentmods.dev/badge/skills/fellipeutaka/leon/kanpeki.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 104 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,486 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 original No closer match found 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.

Model	Per session	Once invoked
Fable 5.1	$0.00104	$0.01486
Opus 5.5	$0.00042	$0.00594
Sonnet 5.5	$0.00021	$0.00297
Haiku 4.5	$0.00010	$0.00149

Measured 2mo ago against content hash 83392091a442, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

kanpeki 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 2mo ago.

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.

skills/kanpeki/SKILL.md · 106 lines

How it starts

The opening of the file, as written. The whole thing — 106 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Kanpeki

Kanpeki is a copy-paste component library for React. Components are copied into your project (not installed as npm packages) via the shadcn CLI. Built on React Aria Components (accessibility), CVA beta (variants), and Tailwind CSS 4.1 (styling).

Docs: https://kanpeki.vercel.app

Quick Start

Install dependencies, create ~/lib/cva.ts, configure globals.css, then add components:

npx shadcn@latest add @kanpeki/button

Components are copied to ~/components/ui/<name>/. You own the code.

See references/installation-setup.md for full setup (deps, CVA config, globals.css, dark mode, path alias).

Component Architecture

Each component has: index.ts (exports), <name>.tsx (implementation), styles.ts (CVA variants).

Simple components — single export: import { Button } from "~/components/ui/button"
Multi-part components — namespace exports: import { Dialog } from "~/components/ui/dialog" → Dialog.Root, Dialog.Content, etc.

Multi-part components: Accordion, Breadcrumb, ButtonGroup, Calendar, Card, Carousel, Chart, Combobox, DateField, DatePicker, Dialog, Drawer, Field, InputGroup, ListBox, Menu, NumberField, Pagination, Popover, RadioGroup, Resizable, ScrollArea, SearchField, Select, Sheet, Sidebar, Slider, Table, Tabs, Toast, ToggleGroup, Tooltip.

Key rule: Always use composeRenderProps from react-aria-components on React Aria primitives — required for state selectors (pressed:, selected:, etc.). For plain HTML elements, call CVA directly.

See references/component-patterns.md for full examples (Button, Dialog, namespace pattern, customization).

Form System

3-layer architecture: Form > Field > Input component.

Field.Root's render prop connects to a React Aria form primitive (TextField, Select, NumberField, etc.) for automatic label association and validation.

Form Library Integration

Determine the form library:
- React Hook Form? → See references/form-react-hook-form.md
- TanStack Form? → See references/form-tanstack-form.md
- Native HTML validation only? → Use React Aria <Form> + isRequired on primitives

Read the full file on GitHub · 106 lines

Files

What ships with it

7 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.

2mo ago First seen · 106 lines · 104 tokens per session scan A 83392091a442

Subscribe to this mod's changes

kanpeki is a skill published in the GitHub repository fellipeutaka/leon (5 stars, last pushed yesterday), licensed MIT. It adds 104 tokens to every session and 1,486 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

Design and UX Frontend React

kanpeki next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
kanpekifellipeutaka/leon	Skill	5	yesterday	MIT	A	104	Claude Code, Codex
chakra-ui-builderchakra-ui/chakra-ui	Skill	41k	yesterday	MIT	A	214	Claude Code, Codex
tamagui-v6-configtamagui/tamagui	Skill	14k	today	MIT	A	0	Claude Code, Codex
tamagui-theme-generatortamagui/tamagui	Skill	14k	today	MIT	A	48	Claude Code, Codex
frontend-ui-dark-tsmicrosoft/skills	Skill	3.2k	yesterday	MIT	A	48	Claude Code
cobejsMengTo/Skills	Skill	7.3k	yesterday	MIT	A	31	Claude Code, Codex
vercel-composition-patternscalesthio/OpenMontage	Skill	77k	3d ago	AGPL-3.0	A	58	Claude Code, Codex