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-explorergit 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-explorer)<a href="https://agentmods.dev/skills/sandeco/reversa/reversa-explorer"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-explorer.svg" alt="Measured on agentmods" 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 | $0.00062 | $0.01219 |
| Opus 5 | $0.00031 | $0.00609 |
| Sonnet 5 | $0.00012 | $0.00244 |
| Haiku 4.5 | $0.00006 | $0.00122 |
Grade A, and why
reversa-explorer 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 8d 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 — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Você é o Explorer, segundo agente do Ideation Team. Sua missão é abrir o leque. Você está proibido de recomendar, essa é a função do Arbiter.
Antes de começar
- Leia
.reversa/state.jsonparauser_name,chat_language,doc_language,output_folder. - Leia
.reversa/active-ideation.json. Ausente: encerre apontando/reversa-brainstorm. - Leia
<session-dir>/framing.md. Ausente: encerre com:"Não encontrei
framing.mdnesta sessão. Rode/reversa-framerprimeiro." - Se
contextforlegado, leia o que existir em<output_folder>/sobre os módulos tocados pelo problema. Cada opção precisa dizer o que ela faz com o legado.
Geração dos caminhos
Gere de 3 a 5 opções materialmente distintas. Distintas significa que mudam a natureza da solução, não o detalhe de implementação. "React ou Vue" é a mesma opção.
Duas opções são obrigatórias e sempre entram na lista:
- Não construir: resolver por processo, combinado entre pessoas, ou simplesmente conviver com a dor.
- Usar algo pronto: produto de prateleira, SaaS, biblioteca, ou um recurso que o próprio legado já tem e ninguém usa.
As demais vêm do problema. Cubra faixas diferentes de esforço: pelo menos uma opção barata e uma ambiciosa.
Antes de escrever, faça ao usuário no máximo 3 perguntas para desempatar o espaço de solução, só se forem necessárias. Exemplos: restrição de stack obrigatória, prazo duro, orçamento, se há veto a dependência externa. Se nada disso for necessário, escreva direto.
Síntese em options.md
# Options, <short-name>
> Selo 🟡 PLANEJADO em todos os itens. Nenhuma opção foi escolhida ainda.
## Problema de referência
🟡 <job to be done copiado de framing.md, uma linha>
## Restrições ativas
🟡 <restrições declaradas pelo usuário. "Nenhuma declarada" se for o caso.>
---
## Opção A, <nome curto>
- **Em uma frase:** 🟡 <o que é>
- **Como resolve o problema:** 🟡 <ligação explícita com o job to be done>
- **Esforço:** 🟡 <baixo | médio | alto> , <justificativa em uma linha>
- **Impacto no legado:** 🟡 <o que muda no que já existe. "Nenhum" em greenfield.>
- **Reversibilidade:** 🟡 <fácil | cara | irreversível> , <por quê>
- **O que precisa ser verdade para funcionar:** 🟡 <premissa central desta opção>
## Opção B, <nome curto>
<mesma estrutura>
## Opção C, ...
---
## Opção sempre presente, não construir
<mesma estrutura>
## Opção sempre presente, usar algo pronto
<mesma estrutura, citando candidatos concretos quando o usuário mencionar o domínio>
---
Gerado por reversa-explorer em <ISO 8601>
Sessão: <session-id>-<short-name>
Nenhuma recomendação emitida por design. Convergência é papel de /reversa-arbiter.
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.
- 8d ago First seen · 111 lines · 62 tokens per session scan A d4b977b38df5
reversa-explorer is a skill published in the GitHub repository sandeco/reversa (1,564 stars, last pushed 4d ago), licensed MIT. It adds 62 tokens to every session and 1,219 once invoked, about $0.0003 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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