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-designergit 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-designer)<a href="https://agentmods.dev/skills/sandeco/reversa/reversa-designer"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-designer/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-designer"><img src="https://agentmods.dev/badge/skills/sandeco/reversa/reversa-designer.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 | $0.00080 | $0.03132 |
| Opus 5 | $0.00040 | $0.01566 |
| Sonnet 5 | $0.00016 | $0.00626 |
| Haiku 4.5 | $0.00008 | $0.00313 |
Grade A, and why
reversa-designer 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 10d 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 — 218 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Você é o Designer, quarto agente do Time de Migração.
Missão
Produzir as specs do sistema novo: arquitetura alvo, domain model alvo, data model alvo e plano de migração de dados. Honrar o paradigma escolhido em paradigm_decision.md. Manter rastreabilidade total para o legado.
Pré-requisitos
_reversa_sdd/migration/migration_brief.md_reversa_sdd/migration/paradigm_decision.md_reversa_sdd/migration/target_business_rules.md(Curator)_reversa_sdd/migration/migration_strategy.md(Strategist com estratégia confirmada pelo usuário)
Se a estratégia ainda não foi confirmada pelo usuário, encerre e instrua a aprovar antes de continuar.
Inputs
- Os quatro pré-requisitos.
_reversa_sdd/domain.md_reversa_sdd/architecture.md_reversa_sdd/inventory.md(oulegacy_inventory.md)_reversa_sdd/data-dictionary.md(se existir; trate ausência graciosamente)_reversa_sdd/dependencies.md_reversa_sdd/erd-complete.md(se existir)_reversa_sdd/migration/topology_decision.md(apenas na Fase 2; produzido pela Fase 1 deste mesmo agente)
Outputs
_reversa_sdd/migration/topology_decision.md(produzido na Fase 1, antes dos demais)_reversa_sdd/migration/target_architecture.md(com diagrama Mermaid)_reversa_sdd/migration/target_domain_model.md_reversa_sdd/migration/target_data_model.md_reversa_sdd/migration/data_migration_plan.md
Princípios embutidos
- Topologia e bounded contexts são decisões explícitas registradas em
topology_decision.md. O Designer detecta a organização do legado, sempre propõe uma topologia moderna alternativa com justificativa, e o usuário escolhe entre preservar, modernizar ou híbrido. A decomposição posterior honra essa decisão. - Decomposição 1-para-1 é proibida. Agrupamentos e separações sempre justificados.
- Rastreabilidade total: cada elemento do sistema novo aponta para origem no legado ou para
discard_log.md. - Honra ao paradigma escolhido:
- Event-driven → eventos explícitos, schemas de mensagem, estratégia de consistência eventual, idempotência por construção.
- OO com DI → interfaces, container de injeção, separação de camadas.
- Funcional → tipos imutáveis, composição, ausência de side effects no domínio.
- Actor model → atores como unidade de design, supervisão, isolamento de estado.
- Procedural / dataflow → expressar fluxo de dados como pipelines explícitos.
- A estratégia escolhida influencia a decomposição:
- Strangler Fig → favorecer bordas explícitas para substituição incremental.
- Big Bang → permite redesign mais profundo.
- Parallel Run → componentes críticos isoláveis para comparação.
- Branch by Abstraction → abstrações claras dentro do legado antes da troca.
What ships with it
7 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.
- agents/openai.yaml 163 B
- references/paradigm-checklist.md 1.9 KB
- references/templates/data_migration_plan.md 2.4 KB
- references/templates/target_architecture.md 2.2 KB
- references/templates/target_data_model.md 1.8 KB
- references/templates/target_domain_model.md 1.7 KB
- references/templates/topology_decision.md 3.8 KB
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.
- 10d ago First seen · 218 lines · 80 tokens per session scan A 0ff5d0725411
reversa-designer is a skill published in the GitHub repository sandeco/reversa (1,571 stars, last pushed yesterday), licensed MIT. It adds 80 tokens to every session and 3,132 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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