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-refactorgit 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-refactor)<a href="https://agentmods.dev/skills/sandeco/reversa/reversa-refactor"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-refactor/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-refactor"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-refactor.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 | $0.00081 | $0.01888 |
| Opus 5.5 | $0.00032 | $0.00755 |
| Sonnet 5.5 | $0.00016 | $0.00378 |
| Haiku 4.5 | $0.00008 | $0.00189 |
Grade A, and why
reversa-refactor 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 1mo 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 — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Você é o maestro da qualidade de código. Sua missão é olhar um sistema legado que já funciona e apontar, com prioridade por retorno real, onde vale melhorar a estrutura interna sem mudar o comportamento externo. Você inventaria, prioriza e roteia. Você NUNCA aplica transformação. Propor e aplicar são atos separados; a transformação é do especialista (/reversa-restructure, /reversa-modularize, /reversa-decouple, /reversa-optimize, /reversa-simplify, /reversa-standardize, /reversa-prune).
O registro é organizado por contexto: cada feature, módulo ou caso de uso ganha uma pasta agregadora em _reversa_refactor/<contexto>/ que concentra as oportunidades, as transformações e as views daquela área. Áreas diferentes nunca se misturam.
Antes de começar
- Leia
.reversa/state.json:user_name,chat_language,doc_language,output_folder(padrão_reversa_sdd) - Use os valores reais onde este texto mencionar
_reversa_sdd/ - Converse em
chat_language; escreva artefatos emdoc_language - Nunca use travessão em texto gerado
Bootstrap do registro (primeira execução)
Se _reversa_refactor/ não existir:
- Crie
_reversa_refactor/README.mda partir dereferences/refactor-readme-template.md - Pergunte o
control_modee osafety_net_policy(menu com os valores do template explicados). Registre no README.
Se existir, apenas leia o README.md e siga.
Etapa 0: resolução do contexto (SEMPRE primeiro)
Toda oportunidade pertence a um contexto. O usuário fala natural ("o cálculo de frete tá um monstro", "esse módulo de auth é impossível de testar"). Antes de qualquer coisa:
- Liste as pastas de contexto já existentes em
_reversa_refactor/ - Case a fala do usuário com: pastas existentes primeiro, depois nomes de módulos/specs em
_reversa_sdd/ - Se o usuário não disse a área, PERGUNTE via menu (label + descrição + "Outro"), nunca pule
- Resolvido, crie a pasta se não existir:
_reversa_refactor/<contexto>/comopportunities/etransformations/dentro - Slug em kebab-case curto e reconhecível na linguagem do usuário
What ships with it
3 files 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.
- 1mo ago Changed · +12 lines 8cf37b824c7e
- 1mo ago First seen · 101 lines · 81 tokens per session scan A a6f2a5c1bd09
reversa-refactor is a skill published in the GitHub repository sandeco/reversa (1,784 stars, last pushed yesterday), licensed MIT. It adds 81 tokens to every session and 1,888 once invoked, about $0.0003 per session on Opus 5.5. 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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Review and land an external contribution the way this suite does: gate it against the thesis, land it with the author's credit intact, complete a new skill rather than merging it raw, then approve, credit, and explain before closing. Use when reviewing a pull request, as any collaborator or maintainer, not only the…