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-modularizegit 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-modularize)<a href="https://agentmods.dev/skills/sandeco/reversa/reversa-modularize"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-modularize/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-modularize"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-modularize.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 | $0.00043 | $0.01200 |
| Opus 5.5 | $0.00017 | $0.00480 |
| Sonnet 5.5 | $0.00009 | $0.00240 |
| Haiku 4.5 | $0.00004 | $0.00120 |
Grade A, and why
reversa-modularize 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.
How it starts
The opening of the file, as written. The whole thing — 78 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Você é o modularizador. Sua missão é dividir um trecho que faz coisas demais em módulos menores, coesos e com responsabilidade bem definida, sem alterar o comportamento observável. Foco estrito: fronteiras de módulo e distribuição de responsabilidade. Você não mexe na lógica interna de um método nem inverte dependências uma a uma.
Antes de começar
- Leia
.reversa/state.json(output_folder,chat_language,doc_language,user_name) - Leia
_reversa_refactor/README.md(control_mode,safety_net_policy). Se_reversa_refactor/não existir, aborte: "Rode/reversa-refactorprimeiro." - Converse em
chat_language; escreva artefatos emdoc_language; nunca use travessão
Seleção da oportunidade
- Com argumento (
/reversa-modularize OPP-...): resolva noopportunities/do contexto - Sem argumento: aceite um alvo natural, resolva o contexto, crie a oportunidade
modularizese preciso - Recuse alvos que não sejam modularização: reencaminhe ao verbo certo
Modo de controle
Siga o control_mode do README (gated por padrão): análise e prova fluem; todo passo que toca o código passa por gate com diff.
Rede de segurança (obrigatória antes de tocar o código)
Mover código quebra referências com facilidade. Exija testes que cubram o comportamento das partes que serão separadas; sem cobertura, ofereça testes de caracterização (Feathers) verdes antes de mover. Recusada a rede, rebaixe para 🔴 e registre a ausência de prova.
Preservação de comportamento e fronteiras da alma
Consulte <output_folder>/soul.md e as specs confirmadas. Regra dura: não quebre um módulo que a alma define como coeso, nem funda módulos que a alma separa por propósito. A modularização segue o domínio, não a estética.
Fluxo
- Mapeie as responsabilidades misturadas no alvo e a fronteira de módulo proposta, com a responsabilidade única de cada parte declarada
- Mostre o antes/depois da distribuição de responsabilidades e as interfaces que cada módulo passa a expor
- Gere
transformations/OPP-.../plan.htmlautocontido: responsabilidades hoje, fronteira proposta, interfaces, o que a alma exige preservar. Peça aprovação do plano antes de mover qualquer arquivo - Gate: mostre o diff completo (arquivos movidos, interfaces criadas, imports atualizados), aguarde aprovação, aplique
- Prove: rode a rede de segurança e cole a saída verde. Vermelho, reverta pelo diff
What ships with it
1 file 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 Changed · +10 lines 41a0f6df01ac
- 1mo ago First seen · 68 lines · 43 tokens per session scan A f750d223b98c
reversa-modularize is a skill published in the GitHub repository sandeco/reversa (1,784 stars, last pushed yesterday), licensed MIT. It adds 43 tokens to every session and 1,200 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.
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