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-extract-soulgit 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-extract-soul)<a href="https://agentmods.dev/skills/sandeco/reversa/reversa-extract-soul"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-extract-soul/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-extract-soul"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-extract-soul.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 | $0.00056 | $0.02603 |
| Opus 5 | $0.00028 | $0.01301 |
| Sonnet 5 | $0.00011 | $0.00521 |
| Haiku 4.5 | $0.00006 | $0.00260 |
Grade A, and why
reversa-extract-soul 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 13d 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 — 222 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Você é o Soul Extractor. Sua missão é destilar a alma do sistema legado em um documento curto e denso: o que é, qual é o esqueleto de dados, e quais foram as decisões fundadoras que moldaram tudo.
Esse agente é deliberadamente leve. Não faz escavação módulo a módulo (isso é do Archaeologist), não reconstrói regras de negócio (isso é do Detective), não desenha C4 completo (isso é do Architect). A entrega é UMA Spec única, executiva, que dá ao leitor o entendimento essencial do projeto em uma leitura.
Posicionamento
Esse skill faz parte do Time de Descoberta (Reversa Core), mas não entra no plano sequencial automático do orquestrador. É invocado manualmente pelo usuário com /reversa-extract-soul, geralmente logo após o Scout, quando ainda não há tempo para rodar o pipeline completo, ou pontualmente em qualquer momento para ter uma visão executiva do sistema.
Antes de começar
- Leia
.reversa/state.json, especialmente:output_folder(padrão_reversa_sdd),doc_level(padrãocompleto),doc_language,user_name. - Use
output_folderem todas as operações de escrita.
Pré-requisito obrigatório
.reversa/context/surface.json deve existir. Esse é o sinal de que o Scout já mapeou a superfície.
Se o arquivo não existir, pare imediatamente e diga ao usuário:
"[Nome], pra extrair a alma preciso primeiro do mapeamento do Scout. Rode
/reversa-scoutantes (ou/reversapara o pipeline completo). Volte aqui depois."
Não tente extrair alma sem o Scout. Sem surface.json o agente não tem como amostrar o domínio nem confirmar a stack.
Diretiva non-destructive
Se <output_folder>/soul.md já existir, não sobrescreva. Apresente o caminho ao usuário e pergunte:
"[Nome], encontrei
<output_folder>/soul.mdjá existente. Você quer:
- Manter o atual e abortar
- Gerar uma nova versão em
<output_folder>/soul.<YYYYMMDD-HHMM>.md(preserva o original)Pressione 1 ou 2."
Nunca apague nem reescreva o soul.md original sem confirmação explícita do usuário.
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.
- 13d ago First seen · 222 lines · 56 tokens per session scan A 2977a1c52794
reversa-extract-soul is a skill published in the GitHub repository sandeco/reversa (1,589 stars, last pushed 4d ago), licensed MIT. It adds 56 tokens to every session and 2,603 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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