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 jnPiyush/AgentX --skill prototype-craftgit clone --depth 1 https://github.com/jnPiyush/AgentXWrote 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/jnpiyush/agentx/prototype-craft)<a href="https://agentmods.dev/skills/jnpiyush/agentx/prototype-craft"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/prototype-craft/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/jnpiyush/agentx/prototype-craft"><img src="https://agentmods.dev/badge/skills/jnpiyush/agentx/prototype-craft.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 | $0.00059 | $0.01243 |
| Opus 5.5 | $0.00024 | $0.00497 |
| Sonnet 5.5 | $0.00012 | $0.00249 |
| Haiku 4.5 | $0.00006 | $0.00124 |
Grade A, and why
prototype-craft 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 29d 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 — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Prototype Craft
Build beautiful, interactive HTML/CSS prototypes that look and feel like real products -- not wireframes.
When to Use This Skill
- Building HTML/CSS prototypes that need production-quality visual polish
- Implementing color palettes, typography scales, and spacing systems
- Adding micro-interactions, transitions, and elevation shadows
- Crafting responsive layouts with modern CSS (Grid, Flexbox, custom properties)
- Polishing UX deliverables beyond skeletal wireframes
Core Rules
- Visual polish first -- prototypes MUST look production-quality, not skeletal
- Modern CSS -- use CSS Grid, Flexbox, custom properties, clamp(), container queries
- Typography -- use font pairing (max 2-3 families), proper scale (1.25-1.333 ratio), line-height 1.5-1.75
- Color system -- define palette with CSS custom properties: primary, secondary, neutral, success, warning, error + tints/shades
- Spacing rhythm -- use consistent 4px/8px base grid; spacing scale: 4, 8, 12, 16, 24, 32, 48, 64, 96
- Depth and shadow -- layered box-shadows for elevation (sm, md, lg, xl); subtle borders for separation
- Transitions -- all interactive elements have smooth transitions (150-300ms ease); no jarring state changes
- Accessibility -- WCAG 2.1 AA minimum; 4.5:1 contrast; focus-visible; skip-to-content; aria labels
Prerequisites
Start with confirmed audience, primary tasks, brand direction and target
DESIGN.md; inspect existing components before choosing a technique. Browser
inspection is an external prerequisite for judging rendered output, not a
substitute for design.
Decision Guide
Use static HTML for simple flows, and working-prototype-app for routing or durable state. Choose utility layouts for repeated operational tasks, and expressive layouts only when the product context supports them.
Delegated work MUST NOT start, reset, iterate or complete the parent-owned loop; return scoped evidence without changing its baseline or approval history.
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.
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.
- 29d ago Changed · -156 lines 1e4bb8f1a0a9
- 1mo ago First seen · 265 lines · 59 tokens per session scan A 45f31051a6ea
prototype-craft is a skill published in the GitHub repository jnPiyush/AgentX (16 stars, last pushed 3d ago), licensed Apache-2.0. It adds 59 tokens to every session and 1,243 once invoked, about $0.0002 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 2026-09-03.
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