design-web-prototype

design-web-prototype is a skill for Claude Code, Codex from the-sid-dani/second-brain-os. It costs 83 tokens per session (951 once invoked), scanned A, a copy of web-prototype, MIT.

A general-purpose, single-file HTML prototype for a desktop web page. It provides prepared visual styles and section layouts for landing pages, marketing pages, documentation, and SaaS products—online software services.

In plain words
What is it for?
Use it to build a self-contained web mockup or prototype for a landing page, marketing site, documentation page, or SaaS interface. It supports composing pages from the available section patterns and design tokens, which are named visual settings such as colours and spacing.
Why use it?
It gives a starting structure for a web concept without requiring a full application. Reusing the provided styles and layouts helps keep the prototype consistent as sections are added.

Skill for Claude CodeCodex

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.

agentmods
npx agentmods add skills/the-sid-dani/second-brain-os/design-web-prototype
Any agent
npx skills add the-sid-dani/second-brain-os --skill design-web-prototype
Clone the repo
git clone --depth 1 https://github.com/the-sid-dani/second-brain-os

Made for: Claude Code, Codex.

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 design-web-prototype

README.md
[![agentmods](https://agentmods.dev/badge/skills/the-sid-dani/second-brain-os/design-web-prototype.svg)](https://agentmods.dev/skills/the-sid-dani/second-brain-os/design-web-prototype)
Your own site
<a href="https://agentmods.dev/skills/the-sid-dani/second-brain-os/design-web-prototype"><img src="https://agentmods.dev/badge/skills/the-sid-dani/second-brain-os/design-web-prototype.svg" alt="Measured on agentmods" height="20"></a>
Per session 83 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 951 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin 88% copy Near-identical to another mod 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 $0.00083 $0.00951
Opus 5 $0.00042 $0.00476
Sonnet 5 $0.00017 $0.00190
Haiku 4.5 $0.00008 $0.00095

Measured 4d ago against content hash 85b6df080a86, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

design-web-prototype 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 4d 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

This is a copy

88% identical to web-prototype — 25 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.claude/skills/design-web-prototype/SKILL.md · 77 lines

How it starts

The opening of the file, as written. The whole thing — 77 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Web Prototype Skill

Produce a single, self-contained HTML prototype using the bundled seed and layout library — not by writing CSS from scratch. The seed already encodes good defaults (typography, spacing, accent budget). Your job is to compose it.

Resource map

web-prototype/
├── SKILL.md                ← you're reading this
├── assets/
│   └── template.html       ← seed: tokens + class system + chrome (READ FIRST)
└── references/
    ├── layouts.md          ← 8 paste-ready section skeletons
    └── checklist.md        ← P0/P1/P2 self-review

Workflow

Step 0 — Pre-flight (do this once before writing anything)

  1. Read assets/template.html end-to-end — at minimum through the <style> block. The class inventory at the top of references/layouts.md lists every class that must be defined there; if one is missing, add it to <style> rather than re-defining it inline on every section.
  2. Read references/layouts.md so you know which section skeletons exist. Don't write a section type that isn't covered — pick the closest layout and adapt.
  3. Read the active DESIGN.md (already injected into your system prompt). Map its colors to the six :root variables in the seed; don't introduce new tokens.

Step 1 — Copy the seed

Copy assets/template.html to the project root as index.html. Replace the six :root variables with the active design system's tokens. Replace the page <title> and the topnav brand.

Step 2 — Plan the section list

Pick layouts before writing copy. Default rhythms (from layouts.md):

Page kind Default rhythm
Landing 1 hero → 3 features → 4 stats or 5 quote → custom split → 6 cta
Marketing / editorial 1 hero-center → 7 log list → 6 cta
Pricing 1 hero-center → 8 comparison table → 6 cta
Docs index 1 hero-center → 7 log list (sections of docs) → 6 cta

State the chosen list in one sentence to the user before writing — they can redirect cheaply now and not after 200 lines of HTML.

Read the full file on GitHub · 77 lines

Files

What ships with it

4 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.

  1. 4d ago First seen · 77 lines · 83 tokens per session scan A 85b6df080a86

Subscribe to this mod's changes

design-web-prototype is a skill published in the GitHub repository the-sid-dani/second-brain-os (2 stars, last pushed 29d ago), licensed MIT. It adds 83 tokens to every session and 951 once invoked, about $0.0004 per session on Opus 5. A static security scan graded it A with 0 findings. It is 88% identical to web-prototype, differing in 25 lines, and is treated as a copy.

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