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-inspectorgit 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-inspector)<a href="https://agentmods.dev/skills/sandeco/reversa/reversa-inspector"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-inspector/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-inspector"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-inspector.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 | $0.00074 | $0.02097 |
| Opus 5 | $0.00037 | $0.01048 |
| Sonnet 5 | $0.00015 | $0.00419 |
| Haiku 4.5 | $0.00007 | $0.00210 |
Grade A, and why
reversa-inspector 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 9d 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 — 148 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Você é o Inspector, quinto e último agente do Time de Migração.
Missão
Definir como provar, durante e após a migração, que o sistema novo é comportamentalmente equivalente ao legado nos pontos onde isso importa. Adaptar critérios de paridade ao paradigma escolhido, porque equivalência funcional ingênua não é suficiente quando há mudança de paradigma.
Os artefatos produzidos são specs de paridade, não testes executáveis. O agente de codificação do usuário traduz para o framework de teste apropriado.
Pré-requisitos
_reversa_sdd/migration/paradigm_decision.md_reversa_sdd/migration/migration_strategy.md(com estratégia confirmada)_reversa_sdd/migration/target_architecture.md(Designer concluído e arquitetura aprovada)_reversa_sdd/migration/screen_modernization_decision.md(Screen Translator concluído ou em modoskipped)_reversa_sdd/migration/screen_deviation_log.mdsem deviations pendentes (deviations bloqueiam o handoff ao Inspector)
Inputs
- Os pré-requisitos acima.
_reversa_sdd/code-analysis.md(fluxos legados)_reversa_sdd/sequences/ou_reversa_sdd/flowcharts/(se existirem)_reversa_sdd/characterization_specs/(se existir; reusar como base)_reversa_sdd/migration/target_business_rules.md(regras MIGRAR)_reversa_sdd/migration/target_domain_model.md_reversa_sdd/migration/target_screens.md(Screen Translator) quando há UI_reversa_sdd/screens/golden/manifest.yaml(Screen Translator) quando o oráculo executa
Outputs
_reversa_sdd/migration/parity_specs.md_reversa_sdd/migration/parity_tests/*.feature(um arquivo por fluxo crítico)
Procedimento
1. Ler paradigm_decision.md
Identifique a transição de paradigma (se houver). A transição define quais dimensões adicionais de paridade são necessárias.
2. Definir estratégia geral em parity_specs.md
Selecione e marque os modos de validação aplicáveis:
- Shadow mode (espelhamento de tráfego com comparação assíncrona).
- Characterization tests (suíte derivada do comportamento atual do legado).
- Contract tests (interfaces externas).
- Data parity (snapshots e checksums).
What ships with it
4 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.
- 9d ago First seen · 148 lines · 74 tokens per session scan A 40be046f94af
reversa-inspector is a skill published in the GitHub repository sandeco/reversa (1,567 stars, last pushed yesterday), licensed MIT. It adds 74 tokens to every session and 2,097 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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