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 parisgroup-ai/imersao-ia-setup --skill prototype-firstgit clone --depth 1 https://github.com/parisgroup-ai/imersao-ia-setupWrote 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/parisgroup-ai/imersao-ia-setup/prototype-first)<a href="https://agentmods.dev/skills/parisgroup-ai/imersao-ia-setup/prototype-first"><img src="https://agentmods.dev/badge/skills/parisgroup-ai/imersao-ia-setup/prototype-first/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/parisgroup-ai/imersao-ia-setup/prototype-first"><img src="https://agentmods.dev/badge/skills/parisgroup-ai/imersao-ia-setup/prototype-first.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 | $0.00097 | $0.00598 |
| Opus 5.5 | $0.00039 | $0.00239 |
| Sonnet 5.5 | $0.00019 | $0.00120 |
| Haiku 4.5 | $0.00010 | $0.00060 |
Grade A, and why
prototype-first 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 First
Princípio: nunca construa código de UI de produção duas vezes. Antes de escrever a tela "pra valer", prototipe e valide o design — é mais barato mudar um protótipo do que refatorar código já integrado.
Quando esta skill se aplica
- ✅ Vai criar/redesenhar tela, página ou fluxo de uma aplicação web.
- ❌ Auto-pule (não use) quando o trabalho for backend, CLI, script ou biblioteca sem interface — vá direto implementar.
Roteamento
Frontend web completo → Design OS (público)
Para um app ou conjunto de telas, prototipe no Design OS da Builder Methods. Ele roda localmente e é open-source — sem dependências privadas:
git clone https://github.com/buildermethods/design-os.git ../<projeto>-design
cd ../<projeto>-design
git remote remove origin
npm install
npm run dev # http://localhost:3000
Depois, dentro dessa pasta com o Claude Code aberto, conduza o fluxo de design:
/product-vision— define visão, roadmap e formato dos dados/design-tokense/design-shell— sistema visual e casco do app/design-screen— uma tela por seção (preview vivo emlocalhost:3000)/export— gera o handoff (componentes React + Tailwind + specs)
Revise o protótipo vivo e ajuste em linguagem natural antes de exportar. Só então parta para a implementação.
Na imersão: prototipo marca cada tela
onda 1oudepois; implementar constrói só a onda 1 com writing-plans + executing-plans. Caderno:caderno/Comece aqui.md.
UI pequena / um componente isolado → frontend-design
Para um único componente ou uma tela simples que não justifica subir o Design OS, use a
skill frontend-design para gerar a UI direto, com qualidade visual.
Regra de ouro
Saiu do protótipo aprovado? Só aí escreva o código de produção — portando o que foi validado, não inventando de novo.
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 · 55 lines · 97 tokens per session scan A 2109e2cf992b
prototype-first is a skill published in the GitHub repository parisgroup-ai/imersao-ia-setup (1 stars, last pushed 20d ago), licensed MIT. It adds 97 tokens to every session and 598 once invoked, about $0.0004 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 2026-08-31.
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