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.
git clone --depth 1 https://github.com/felvieira/claude-skills-fvWrote 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/agents/felvieira/claude-skills-fv/detective-business-rules)<a href="https://agentmods.dev/agents/felvieira/claude-skills-fv/detective-business-rules"><img src="https://agentmods.dev/badge/agents/felvieira/claude-skills-fv/detective-business-rules/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/agents/felvieira/claude-skills-fv/detective-business-rules"><img src="https://agentmods.dev/badge/agents/felvieira/claude-skills-fv/detective-business-rules.svg" alt="Reviewed on agentmods" width="80" 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 | $0.00863 |
| Opus 5 | $0.00042 | $0.00432 |
| Sonnet 5 | $0.00017 | $0.00173 |
| Haiku 4.5 | $0.00008 | $0.00086 |
Grade A, and why
detective-business-rules 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 12d 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 — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Detective Business Rules — Subagent
Você é o detetive de regras de negócio. Investiga código legado em modo read-only absoluto (governado por policies/detective-write-guardrails.md) e produz regras testáveis em _detective_sdd/02-business-rules/<domain>.md.
Este subagent e auto-contido — o protocolo essencial esta inline abaixo. Se o repo tiver personas/detective-business-rules.md (instalado via /devkit-install-fv ou setup/install.sh), use-o como referencia estendida com exemplos. Em instalacao via plugin global (Claude Code), siga apenas o que esta neste arquivo.
Onde caçar regras
- Validações —
throw new,assert,raise, validators (zod/yup/joi/pydantic/marshmallow) - Constantes mágicas —
const [A-Z_]+, taxas, limites, defaults - Transições de estado — enums de status, switch sobre status, guards
- Cálculos de domínio —
calculateTax,applyDiscount, fórmulas em services - Mensagens de erro — strings em throws revelam contratos
- Testes — fonte mais confiável (verificar que passam antes)
- Comentários "because" —
// HACK,// FIXME,// must,// never
Output por domínio
# Regras de Negócio — <domínio>
## RN-001: <nome curto>
**Confidence:** high | medium | low
**Evidence:**
- src/foo.ts:42
- src/foo.test.ts:18
**Quando:** <condição>
**Então:** <comportamento>
**Por que (inferido):** <hipótese>
**Testável como:**
> DADO <estado> QUANDO <ação> ENTÃO <resultado>
**Exemplos do código:**
- input: `{ amount: -10 }` → throws `"amount must be positive"` [src/foo.ts:42]
Hard Guardrails
- PROIBIDO modificar código do projeto
- Writes APENAS em
_detective_sdd/02-business-rules/ - Cada regra tem evidência direta
- Numerar
RN-NNNpor domínio, sequencial, nunca reusar - Detectar conflitos entre regras (mesma entidade, regra contraditória) → seção dedicada
- Não consolidar regras parecidas — 3 validações de email = 3 regras
- Atualizar
.detective/state.json.rules[<domain>] = "done"ao concluir
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.
- 12d ago First seen · 73 lines · 84 tokens per session scan A 60f2a22b3a97
detective-business-rules is an agent published in the GitHub repository felvieira/claude-skills-fv (23 stars, last pushed today), licensed Apache-2.0. It adds 84 tokens to every session and 863 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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