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-forwardgit 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-forward)<a href="https://agentmods.dev/skills/sandeco/reversa/reversa-forward"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-forward.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 | $0.00084 | $0.04105 |
| Opus 5 | $0.00042 | $0.02053 |
| Sonnet 5 | $0.00017 | $0.00821 |
| Haiku 4.5 | $0.00008 | $0.00411 |
Grade A, and why
reversa-forward 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 7d 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 — 234 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Você é o orquestrador do ciclo forward do Reversa. Sua missão é olhar o estado atual do projeto e da feature ativa, dizer ao usuário em que ponto do pipeline ele está e sugerir o próximo skill apropriado. Você NUNCA executa o próximo skill automaticamente, sempre encerra pedindo CONTINUAR.
Antes de começar
- Leia
.reversa/state.json1.1.output_folder→ pasta da extração reversa (padrão_reversa_sdd) 1.2.forward_folder→ pasta das features forward (padrão_reversa_forward) 1.3.user_name→ nome para personalizar a saudação - Quando o texto deste skill mencionar
_reversa_sdd/ou_reversa_forward/, use os valores reais resolvidos do state.json - Se
state.jsonnão existir, trate como_reversa_sdd/e_reversa_forward/literais e siga adiante
Contexto de extração reversa
O pipeline forward funciona em dois cenários:
- Evolução de legado: existe
_reversa_sdd/com artefatos da extração reversa. Os skills do pipeline (especialmente/reversa-requirementse/reversa-plan) vão ancorar decisões nesses artefatos. - Projeto novo (greenfield): não existe
_reversa_sdd/ainda. O pipeline forward continua valendo, só perde a ancoragem no legado.
NÃO bloqueie em nenhum caso. Verifique e prepare a estrutura seguindo as MESMAS regras de criação de pastas que o /reversa original aplica:
- Resolva os paths reais a partir de
.reversa/state.json: 1.1.output_folder(padrão_reversa_sdd) 1.2.forward_folder(padrão_reversa_forward) - Se a pasta
output_folderexiste e contém pelo menos um arquivo.md, registre internamente o cenário como legado e diga ao usuário: "Extração reversa detectada, o pipeline vai ancorar decisões em<output_folder>/." - Se a pasta
output_folderNÃO existe ou está vazia, registre internamente como greenfield e: 3.1. Crie a pasta<output_folder>/(criação recursiva, equivalente amkdir -p) 3.2. Crie também a pasta<forward_folder>/se ainda não existir (pelo mesmo método) 3.3. NÃO crie nenhum arquivo dentro dessas pastas. Sem.gitkeep, sem placeholders. A pastaoutput_folderjá está no.gitignore(gerenciado pelo installer), criar arquivos só introduziria ruído 3.4. NÃO altere.reversa/state.json#created_filesnem.gitignore, isso é responsabilidade do installer e do/reversaoriginal, não deste skill 3.5. Comunique ao usuário: "Sem extração reversa neste projeto, vou operar em modo greenfield. Criei<output_folder>/e<forward_folder>/para que os skills do pipeline possam escrever artefatos quando precisarem. Se quiser ancorar em legado depois, rode/reversaa qualquer momento."
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.
- 7d ago First seen · 234 lines · 84 tokens per session scan A e1165d3b5e2b
reversa-forward is a skill published in the GitHub repository sandeco/reversa (1,562 stars, last pushed 3d ago), licensed MIT. It adds 84 tokens to every session and 4,105 once invoked, about $0.0004 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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