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.
npx skills add bobmatnyc/claude-mpm-skills --skill headlessuigit clone --depth 1 https://github.com/bobmatnyc/claude-mpm-skillsWrote 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.
[](https://agentmods.dev/skills/bobmatnyc/claude-mpm-skills/headlessui)<a href="https://agentmods.dev/skills/bobmatnyc/claude-mpm-skills/headlessui"><img src="https://agentmods.dev/badge/skills/bobmatnyc/claude-mpm-skills/headlessui/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.
<a href="https://agentmods.dev/skills/bobmatnyc/claude-mpm-skills/headlessui"><img src="https://agentmods.dev/badge/skills/bobmatnyc/claude-mpm-skills/headlessui.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00025 | $0.06962 |
| Opus 5 | $0.00013 | $0.03481 |
| Sonnet 5 | $0.00005 | $0.01392 |
| Haiku 4.5 | $0.00003 | $0.00696 |
Grade A, and why
headlessui 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 7d 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.
How it starts
The opening of the file, as written. The whole thing — 977 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Headless UI - Accessible Component Primitives
Overview
Headless UI provides completely unstyled, fully accessible UI components designed to integrate beautifully with Tailwind CSS. Built by the Tailwind Labs team, it offers production-ready accessibility without imposing design decisions.
Key Features:
- Fully unstyled - bring your own styles
- Complete keyboard navigation
- Screen reader tested
- Focus management
- ARIA attributes handled automatically
- TypeScript support
- React 18 and Vue 3 compatible
- SSR compatible
- Render props for maximum flexibility
Installation:
# React
npm install @headlessui/react
# Vue
npm install @headlessui/vue
Component Catalog
Menu (Dropdown)
Accessible dropdown menus with keyboard navigation and ARIA support.
import { Menu, MenuButton, MenuItems, MenuItem } from '@headlessui/react'
import { ChevronDownIcon } from '@heroicons/react/20/solid'
function DropdownMenu() {
return (
<Menu>
<MenuButton className="inline-flex items-center gap-2 rounded-md bg-gray-800 py-1.5 px-3 text-sm/6 font-semibold text-white shadow-inner shadow-white/10 focus:outline-none data-[hover]:bg-gray-700 data-[open]:bg-gray-700 data-[focus]:outline-1 data-[focus]:outline-white">
Options
<ChevronDownIcon className="size-4 fill-white/60" />
</MenuButton>
<MenuItems
transition
anchor="bottom end"
className="w-52 origin-top-right rounded-xl border border-white/5 bg-white/5 p-1 text-sm/6 text-white transition duration-100 ease-out [--anchor-gap:var(--spacing-1)] focus:outline-none data-[closed]:scale-95 data-[closed]:opacity-0"
>
<MenuItem>
<button className="group flex w-full items-center gap-2 rounded-lg py-1.5 px-3 data-[focus]:bg-white/10">
Edit
</button>
</MenuItem>
<MenuItem>
<button className="group flex w-full items-center gap-2 rounded-lg py-1.5 px-3 data-[focus]:bg-white/10">
Duplicate
</button>
</MenuItem>
<div className="my-1 h-px bg-white/5" />
<MenuItem>
<button className="group flex w-full items-center gap-2 rounded-lg py-1.5 px-3 data-[focus]:bg-white/10">
Delete
</button>
</MenuItem>
</MenuItems>
</Menu>
)
}
What ships with it
1 file 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.
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.
- 7d ago First seen · 977 lines · 25 tokens per session scan A 545fc9c55f8f
headlessui is a skill published in the GitHub repository bobmatnyc/claude-mpm-skills (74 stars, last pushed 1mo ago), licensed MIT. It adds 25 tokens to every session and 6,962 once invoked, about $0.0001 per session on Opus 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 2026-09-03.
Other skills, from other repositories
accessibility
Accessibility patterns for WCAG 2.2 compliance, keyboard focus management, React Aria component patterns, cognitive inclusion, native HTML-first philosophy, and user preference honoring. Use when implementing screen reader support, keyboard navigation, ARIA patterns, focus traps, accessible component libraries…
next-cache-components-adoption
Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…
next-cache-components-optimizer
Drive a Next.js route to instant navigation by setting up an agentic loop, under Cache Components / PPR, on initial load (hard navigation) and client-side navigation (soft navigation). Encode the goal as a failing @next/playwright instant() e2e and work it to green, one verified route at a time; the shipped test then…
next-partial-prefetching-adoption
Turn on Partial Prefetching in a Next.js app and work through the insights it surfaces. Use when the user wants to enable or adopt Partial Prefetching, flip the partialPrefetching flag, opt routes in with export const prefetch = 'partial', audit Link prefetch={true} behavior, preserve existing prefetched UI with…
next-dev-loop
Verify Next.js runtime behavior after editing app code. Use this skill to confirm a change actually works in a running app — not just that it compiles or type-checks. Combines /next/mcp (Next.js's view) with agent-browser (the browser's view). Requires a running next dev.
formkit
Use when working with FormKit forms, validation, schema, or custom inputs in React, Vue, or Nuxt projects.