Borrowing it
Nothing to install: this file belongs to stevesolun/ctx. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/stevesolun/ctx/main/.agents/skills/prototype/SKILL.mdgit clone --depth 1 https://github.com/stevesolun/ctxWrote 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/stevesolun/ctx/prototype)<a href="https://agentmods.dev/skills/stevesolun/ctx/prototype"><img src="https://agentmods.dev/badge/skills/stevesolun/ctx/prototype/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/stevesolun/ctx/prototype"><img src="https://agentmods.dev/badge/skills/stevesolun/ctx/prototype.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 | $0.00039 | $0.00302 |
| Opus 5.5 | $0.00016 | $0.00121 |
| Sonnet 5.5 | $0.00008 | $0.00060 |
| Haiku 4.5 | $0.00004 | $0.00030 |
Grade A, and why
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 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.
What it actually says
Prototype
A prototype is disposable code that answers a specific design question. Let the question, repository, and cheapest credible feedback loop determine its shape.
Pick a branch
Infer the branch from the request and surrounding code:
If both are involved, prototype the riskiest uncertainty first. State a material assumption instead of blocking when the choice can be reversed cheaply.
Shared guidance
- Mark the artifact clearly as a prototype and follow existing project structure.
- Keep it runnable with a simple documented command or URL.
- Prefer in-memory or stubbed dependencies unless persistence or integration is the question being tested.
- Add only the error handling, tests, and structure needed for trustworthy feedback. Avoid production polish and speculative flexibility.
- Make the relevant state, alternatives, or outcomes easy to inspect.
- Stop when the evidence answers the question.
Report the answer, how to exercise the prototype, and its limitations. Do not promote, commit, branch, publish, or preserve the artifact unless the user asks. When preservation is useful, record the question and conclusion alongside it.
What ships with it
3 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.
- 1mo ago First seen · 35 lines · 39 tokens per session scan A 72bd3f44eff8
prototype is a skill published in the GitHub repository stevesolun/ctx (589 stars, last pushed 11d ago), licensed MIT. It adds 39 tokens to every session and 302 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 2026-08-30.
Other skills, from other repositories
brand-identity
Brand strategy and identity design for businesses and products. Use when creating brand guidelines, developing visual identity systems, or defining brand positioning.
generic-react-ux-designer
Professional UI/UX design expertise for React applications. Covers design thinking, user psychology (Hick's/Fitts's/Jakob's Law), visual hierarchy, interaction patterns, accessibility, performance-driven design, and design critique. Use when designing features, improving UX, solving user problems, or conducting design…
graphic-design
Professional graphic design principles for digital and print media. Use when creating visual designs, choosing color palettes, typography, layouts, or providing design feedback.
generic-ux-designer
Professional UX expertise for any project type. Covers user research, design thinking, interaction patterns, accessibility, and design critique. Use when designing new features, improving UX, conducting design reviews, or evaluating user flows. For visual UI work, combine with ui-research skill.
frontend-enhancer
Enhance the visual design of web apps: modern UI components, layout, responsive design, color palettes, animations. Use for styling and UI polish; pair with ui-research first for new design directions.
generic-design-system
Complete design system reference for any project - colors, typography, spacing, components, animations. Adapts to project theme and tech stack. Use when implementing UI, choosing colors, creating animations, or ensuring brand consistency. For new design systems, use ui-research skill first.