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 Casper-Studios/casper-marketplace --skill casper-design-systemgit clone --depth 1 https://github.com/Casper-Studios/casper-marketplaceWrote 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/casper-studios/casper-marketplace/casper-design-system)<a href="https://agentmods.dev/skills/casper-studios/casper-marketplace/casper-design-system"><img src="https://agentmods.dev/badge/skills/casper-studios/casper-marketplace/casper-design-system/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/casper-studios/casper-marketplace/casper-design-system"><img src="https://agentmods.dev/badge/skills/casper-studios/casper-marketplace/casper-design-system.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00133 | $0.08293 |
| Opus 5 | $0.00067 | $0.04147 |
| Sonnet 5 | $0.00027 | $0.01659 |
| Haiku 4.5 | $0.00013 | $0.00829 |
Grade A, and why
casper-design-system 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 10d 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 — 542 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Casper Studios Design System
A clean, elevated SaaS design system built on shadcn/ui, Tailwind CSS v4, and React (Vite). Every interface generated for Casper Studios — whether a client demo, internal tool, or quick prototype — must follow these rules to maintain a consistent, professional visual identity across the team.
Before generating any UI code, read this file completely and the reference files listed below. You MUST read the reference files — they contain rules and code examples that are required for correct output. Skipping them will produce incorrect, off-brand UI.
Required for EVERY project:
references/components.md— ALWAYS read. Reusable pieces: stat cards, list items, filter bars, kanban boards, profile cards, product cards, activity feeds, toast notifications, form validation states. Required whenever building UI elements inside a layout.references/theme.css— ALWAYS read. Tailwind CSS v4 theme tokens. Copy this file into your project as-is.assets/— Contains Casper Studios logo SVGs in 4 variants (default, variant, mono-black, mono-white). Use the correct variant based on background color — see the Logo section below.
Required based on platform:
references/web-layouts.md— MUST read when the project is a web application. Web-specific responsive rules + code examples: app shell, sidebar nav, dashboard grid, data table page, page header.references/mobile.md— MUST read when the project is a mobile application. Mobile-specific rules + code examples: device frame, top bar, bottom tab navigation, form patterns, pinned-button layout, list views, card stacks, full screen compositions, contextual actions (menus + bottom sheets).
Non-negotiable: Do not generate UI without reading the platform reference file first. If you are unsure whether the project is web or mobile, ask the user before proceeding.
Before You Generate: Required Context
Before producing any UI code, confirm the following with the user. If their prompt already answers these clearly, proceed without asking. If not, ask before generating anything.
What ships with it
8 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.
- 10d ago First seen · 542 lines · 133 tokens per session scan A bd8ece3dd2bd
casper-design-system is a skill published in the GitHub repository Casper-Studios/casper-marketplace (12 stars, last pushed 5d ago), licensed MPL-2.0. It adds 133 tokens to every session and 8,293 once invoked, about $0.0007 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 2026-08-30.
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