Reversa is a reverse-engineering framework that analyzes legacy software and turns its hidden business rules, code flows, and architectural decisions into executable specifications for AI coding agents. Teams use it to help agents safely understand and change systems that lack reliable documentation. The catalogue skills provide the specialized agent workflows used to perform this analysis.
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 sandeco/reversa --skill reversa-selo-generativogit clone --depth 1 https://github.com/sandeco/reversaWrote 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/sandeco/reversa/reversa-selo-generativo)<a href="https://agentmods.dev/skills/sandeco/reversa/reversa-selo-generativo"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-selo-generativo/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/sandeco/reversa/reversa-selo-generativo"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-selo-generativo.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to high
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- high Prompt Injection · line 102 Hidden instructions were detected in comments or invisible text. These could contain malicious directives. Manual review is recommended.Fix: Audit all comments and invisible characters. Remove any instructions that direct the agent to perform unauthorized actions. Use plain, reviewable content.
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 | $0.00043 | $0.02276 |
| Opus 5 | $0.00022 | $0.01138 |
| Sonnet 5 | $0.00009 | $0.00455 |
| Haiku 4.5 | $0.00004 | $0.00228 |
Grade A, and why
reversa-selo-generativo 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 9d 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 — 177 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Selo Generativo
Cria selos visuais únicos e reprodutíveis para projetos do Reversa usando p5.js. Cada projeto recebe seu próprio artwork generativo derivado de um seed determinístico: o mesmo seed gera o mesmo selo, sempre.
Inspirado no padrão Art Blocks (seeded randomness) e na skill algorithmic-art da Anthropic, mas com escopo deliberadamente menor: produz apenas o selo, não um manifesto filosófico, não uma plataforma de exploração. É um elemento decorativo de identidade.
Quando usar
- Hero da
index.htmldo mini-site gerado pelo/reversa-documentation. - Mini-selo no header de cada página do mini-site (versão reduzida).
- Capa de slides no
deck.html. - Identidade visual de qualquer artefato gerado pelo Reversa que precise de uma marca distintiva.
A skill é leve por design: usa só p5.js, gera canvas único, exporta como SVG ou PNG. Não tem sidebar de exploração, não tem múltiplos modos, não tem animação obrigatória (animação é opcional).
Princípios
- Reprodutibilidade absoluta: mesmo seed sempre gera o mesmo selo.
- Paleta limitada: 3 a 5 cores por selo, derivadas do estilo visual escolhido.
- Composição equilibrada: forma central reconhecível com elementos auxiliares orbitando ou compondo.
- Sem texto no canvas: o selo é puramente visual; nome do projeto e título ficam fora do canvas, em HTML.
- Adaptável de tamanho: o mesmo canvas funciona em 64x64 (mini-selo header) e 800x800 (hero grande).
- Sem dependências além de p5.js: nada de GSAP, dat.GUI, lodash. Só p5.
Fluxo de Trabalho
1. Receber o seed
O seed pode vir de:
- String direta: usuário ou agente passa um hash sha256, nome do projeto, ou qualquer string.
- Caminho de arquivo: usuário aponta para
.reversa/soul.md, a skill computasha256do conteúdo. - Fallback: se nada for fornecido, usar
sha256do timestamp atual (selo "do momento", não reprodutível).
async function computeSeed(input) {
const enc = new TextEncoder();
const data = enc.encode(input);
const hashBuffer = await crypto.subtle.digest("SHA-256", data);
const hashArray = Array.from(new Uint8Array(hashBuffer));
const hashHex = hashArray.map((b) => b.toString(16).padStart(2, "0")).join("");
return hashHex;
}
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.
- 9d ago First seen · 177 lines · 43 tokens per session scan A 57ef1de67198
reversa-selo-generativo is a skill published in the GitHub repository sandeco/reversa (1,589 stars, last pushed 4d ago), licensed MIT. It adds 43 tokens to every session and 2,276 once invoked, about $0.0002 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 2026-09-03.
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