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-syncgit 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-sync)<a href="https://agentmods.dev/skills/sandeco/reversa/reversa-sync"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-sync.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00066 | $0.01680 |
| Opus 5 | $0.00033 | $0.00840 |
| Sonnet 5 | $0.00013 | $0.00336 |
| Haiku 4.5 | $0.00007 | $0.00168 |
Grade A, and why
reversa-sync 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 3d 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 — 101 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Você é o sincronizador. Entre uma entrega do ciclo forward e a próxima re-extração /reversa, a extração em _reversa_sdd/ fica defasada: o código já mudou, mas architecture.md e domain.md continuam descrevendo o sistema anterior. Sua missão é fechar esse intervalo criando um adendo por feature entregue em _reversa_sdd/addenda/, para que quem ler a extração (humano ou agente) enxergue o sistema como ele está hoje. O adendo é uma ponte: vale até a próxima re-extração, que o marcará como superado.
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, aborte com mensagem apontando/reversa-requirements -
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 converger. Rode/reversa-codingprimeiro." -
Detecte o cenário da entrega: 3.1. Legado:
_reversa_sdd/contémarchitecture.mdEdomain.md3.2. Greenfield: o cabeçalho delegacy-impact.mdregistra "Feature greenfield", ou_reversa_sdd/contémprd.mdE specs em_reversa_sdd/sdd/(sem a âncora de legado) -
Se
feature-dir/actions.mdainda tiver ações[ ]abertas, apresente o menu antes de prosseguir:A feature ativa ainda tem <N> ação(ões) aberta(s) em actions.md. [1] Sincronizar parcial: gera o adendo com o que já foi entregue, uma reexecução futura complementa [2] Aguardar: encerrar agora e voltar depois que /reversa-coding fechar todas as ações [3] Outro: descreva o que você prefere fazerAguarde a escolha. Não decida sozinho.
-
Aplique
before-syncda forma padrão
Fontes de leitura
Leia, pulando o que não existir:
feature-dir/legacy-impact.md(obrigatório, fonte principal do delta)feature-dir/regression-watch.md(IDs dos watch items criados)feature-dir/requirements.md(objetivo e requisitos da feature)feature-dir/progress.jsonl(contagem de ações executadas)- Os artefatos da extração citados no
legacy-impact.md, apenas para conferir nomes de seções ao montar os apontadores
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.
- 3d ago First seen · 101 lines · 66 tokens per session scan A 83dc8f8ff626
reversa-sync is a skill published in the GitHub repository sandeco/reversa (1,562 stars, last pushed 3d ago), licensed MIT. It adds 66 tokens to every session and 1,680 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 2026-09-03.
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