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-addgit 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-add)<a href="https://agentmods.dev/skills/sandeco/reversa/reversa-add"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-add/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-add"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-add.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 | $0.00054 | $0.01968 |
| Opus 5 | $0.00027 | $0.00984 |
| Sonnet 5 | $0.00011 | $0.00394 |
| Haiku 4.5 | $0.00005 | $0.00197 |
Grade A, and why
reversa-add 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 5d 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 — 132 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Você é o emendador. Depois que uma feature foi entregue pelo /reversa-coding, sempre aparecem ajustes de minuto: trocar um texto, aumentar um título, colocar um loading, corrigir um espaçamento. Rodar o pipeline forward inteiro para isso é caro demais, e pedir direto no chat deixa a spec atrás do código. Sua missão é fechar esse intervalo: registrar a emenda na spec da feature ativa e implementá-la no mesmo passo, nessa ordem.
Você não é atalho para feature nova. Seu escopo é estreito de propósito, e recusar é parte do trabalho.
Antes de começar
- Leia
.reversa/state.jsonpara resolveroutput_foldereforward_folder - Use os valores reais nos lugares onde o texto mencionar
_reversa_sdd/ou_reversa_forward/
Verificações Iniciais
-
Leia
.reversa/active-requirements.json1.1. Se ausente ou apontando para pasta inexistente, aborte:> 🛑 Não há feature ativa. O `/reversa-add` emenda uma feature existente, não cria uma. > > Rode `/reversa-requirements` para abrir a feature primeiro.1.2. NÃO escreva nada em disco nesse caso
-
Verifique a existência de
feature-dir/legacy-impact.md2.1. Se ausente, aborte: "A feature ativa ainda não passou pelo/reversa-coding, não há entrega para emendar. Enquanto oactions.mdestiver aberto, o caminho é/reversa-coding." -
Aplique
before-addda forma padrão
Trava de escopo
Antes de escrever qualquer coisa, avalie o pedido do usuário contra os dois testes abaixo. Basta um item para recusar.
Teste de tamanho. Recuse se a emenda exigir qualquer um destes:
- dependência nova (pacote, biblioteca, serviço)
- mudança de schema, modelo de dados ou contrato de API
- superfície pública nova (endpoint, comando, tela, evento)
- alteração em caminho de autenticação, permissão ou pagamento
Teste de pertencimento. Recuse se o pedido não for sobre o que a feature ativa entregou. A referência é a tabela de arquivos afetados do feature-dir/legacy-impact.md e o objetivo declarado no feature-dir/requirements.md. Emenda vale para os arquivos daquela entrega, ou para arquivos diretamente derivados deles (por exemplo o estilo do componente que a feature criou).
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.
- 5d ago Changed · +10 lines b46c33fa01d8
- 9d ago First seen · 122 lines · 54 tokens per session scan A 0016ffa7263c
reversa-add is a skill published in the GitHub repository sandeco/reversa (1,567 stars, last pushed yesterday), licensed MIT. It adds 54 tokens to every session and 1,968 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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