html-design-prototypes

html-design-prototypes is a skill for Claude Code from f-labs-io/agent-html-skills. It costs 115 tokens per session (2,764 once invoked), scanned A, original, MIT.

An HTML-based design workspace for sketching and comparing visual interfaces, screens, layouts, components, and animations. HTML is the standard format used to display web pages.

In plain words
What is it for?
Use it to create visual UI prototypes, explore layout or animation options, and compare different interface directions.
Why use it?
It lets developers test structure, typography, spacing, color, and motion in a real browser before translating the design into another framework.

Skill for Claude Code

Written for Claude Code: when-to-use in frontmatter. Also seen: names the AskUserQuestion tool; mentions Claude Code.

Runs only inside its plugin — its command needs a path that Claude Code sets for a plugin’s own hooks and for nothing else. Install the plugin, not this.

Part of the html-skills plugin — 19 skills shipped together

Good fit Use it to create visual UI prototypes, explore layout or animation options, and compare different interface directions.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.

Claude Code
/plugin marketplace add f-labs-io/agent-html-skills
Claude Code
/plugin install html-skills

Made for: Claude Code.

Or install html-skills, the plugin that ships this one along with the rest of its 19 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.

agentmods badge for html-design-prototypes

README.md
[![agentmods](https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-design-prototypes/github.svg)](https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-design-prototypes)
Your own site
<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-design-prototypes"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-design-prototypes/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.

agentmods 80×15 button for html-design-prototypes

Your own site · 80×15
<a href="https://agentmods.dev/skills/f-labs-io/agent-html-skills/html-design-prototypes"><img src="https://agentmods.dev/badge/skills/f-labs-io/agent-html-skills/html-design-prototypes.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 115 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 2,764 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00115 $0.02764
Opus 5.5 $0.00046 $0.01106
Sonnet 5.5 $0.00023 $0.00553
Haiku 4.5 $0.00012 $0.00276

Measured 1mo ago against content hash b202e746b621, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

html-design-prototypes 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 1mo 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

plugins/html-skills/skills/html-design-prototypes/SKILL.md · 148 lines

How it starts

The opening of the file, as written. The whole thing — 148 lines — stays where its author put it; the contents beside it link to each section on GitHub.

HTML Design & Prototypes

HTML is the fastest design surface available — instant feedback loop, real layout engine, real typography, real interaction. Use it to sketch designs even when the production target is React Native, Swift, or anything else. The translation from HTML+CSS to the final framework is mechanical; the design exploration is what's hard.

Pre-flight — run BEFORE writing the artifact

Invoke html-skills:html-skills-listen (Skill tool) first; it is idempotent. If it returns a URL, inject it verbatim as window.__CLAUDE_SUBMIT_URL__ in the HTML you are about to write, ?t= query string included (a local, single-session loopback handshake — not a credential). If it reported web/sandbox mode, leave that line out; submitToClaude then falls back to clipboard mode.

When to use this skill

  • "Design / mock / prototype a [component, screen, animation, transition]"
  • "Help me visualize how X should look"
  • "Try a few directions for the [hero, card, modal, button]"
  • "Tune this animation / interaction"
  • "Build a quick playground for the [tooltip, dropdown, picker]"
  • Whenever the user is in the design-thinking phase, even if the final target is non-web

Output requirements

Real CSS, no Tailwind unless asked. Real fonts via Google Fonts. Real animations via CSS transitions/keyframes or the Web Animations API.

For interactive prototypes, always include a Submit button (calls submitToClaude) that sends the chosen values back to the agent in the standard payload envelope, ready to apply to the real component:

submitToClaude({
  skill: 'html-design-prototypes',
  kind: 'tuned-component',
  data: { component: 'CheckoutButton', params: { duration: '220ms', scale: 1.04, shadow: '8px', easing: 'spring' } },
  version: 1,
});

Patterns

Pattern A: Component playground

A single component on a stage, surrounded by sliders/dropdowns/toggles for every parameter that's worth tuning. Live preview updates as values change. Always end with a Submit button.

Read the full file on GitHub · 148 lines

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.

  1. 1mo ago Changed · +1 lines b202e746b621
  2. 2mo ago Changed · -42 lines · -101 tokens per session cfff50371a53
  3. 2mo ago First seen · 189 lines · 216 tokens per session scan A dce68fbad3dd

Subscribe to this mod's changes

html-design-prototypes is a skill published in the GitHub repository f-labs-io/agent-html-skills (68 stars, last pushed 1mo ago), licensed MIT. It adds 115 tokens to every session and 2,764 once invoked, about $0.0005 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 2026-08-30.

Related

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