detective-flows

detective-flows is an agent for Claude Code from felvieira/claude-skills-fv. It costs 97 tokens per session (1,014 once invoked), scanned A, original, Apache-2.0.

A read-only agent that traces a request, command, job, or event through a legacy system from its entry point to its final side effect.

In plain words
What is it for?
Use it to document HTTP requests, command-line commands, background jobs, event handlers, and streaming flows, including branches, changed state, errors, and evidence from file locations.
Why use it?
It makes complicated execution paths easier to understand without changing the existing code.

Agent for Claude Code

Written for Claude Code: shipped in a Claude Code plugin. Also seen: model in frontmatter; mentions subagents; positional $N argument.

Part of the dev-team-kit-fv plugin — 72 skills, 45 commands, 16 agents, 5 hooks shipped together

Good fit Use it to document HTTP requests, command-line commands, background jobs, event handlers, and streaming flows, including branches, changed state, errors, and evidence from file locations.

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Install with agentmods
npx agentmods add agents/felvieira/claude-skills-fv/detective-flows
Install

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.

Clone the repo
git clone --depth 1 https://github.com/felvieira/claude-skills-fv

Made for: Claude Code.

Or install dev-team-kit-fv, the plugin that ships this one along with the rest of its 72 skills, 45 commands, 16 agents, 5 hooks.

Wrote 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.

agentmods badge for detective-flows

README.md
[![agentmods](https://agentmods.dev/badge/agents/felvieira/claude-skills-fv/detective-flows/github.svg)](https://agentmods.dev/agents/felvieira/claude-skills-fv/detective-flows)
Your own site
<a href="https://agentmods.dev/agents/felvieira/claude-skills-fv/detective-flows"><img src="https://agentmods.dev/badge/agents/felvieira/claude-skills-fv/detective-flows/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.

agentmods 80×15 button for detective-flows

Your own site · 80×15
<a href="https://agentmods.dev/agents/felvieira/claude-skills-fv/detective-flows"><img src="https://agentmods.dev/badge/agents/felvieira/claude-skills-fv/detective-flows.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 97 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,014 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00097 $0.01014
Opus 5 $0.00048 $0.00507
Sonnet 5 $0.00019 $0.00203
Haiku 4.5 $0.00010 $0.00101

Measured 12d ago against content hash fcc2fdccbd77, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-12, from the pricing page.

Security

Grade A, and why

detective-flows 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.

agents/detective-flows.md · 88 lines

How it starts

The opening of the file, as written. The whole thing — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Detective Flows — Subagent

Você é o detetive de fluxos end-to-end. Reconstrói cenas de execução em código legado em modo read-only absoluto (governado por policies/detective-write-guardrails.md) e produz fluxos rastreáveis em _detective_sdd/03-flows/<flow>.md.

Este subagent e auto-contido — o protocolo essencial esta inline abaixo. Se o repo tiver personas/detective-flows.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.

Tipos de fluxo

  1. HTTP request (route → handler → service → side effect → response)
  2. CLI command (argv → handler → side effect → exit code)
  3. Background job (cron/queue → handler → side effect)
  4. Event handler (event bus/webhook → handler → side effect)
  5. WebSocket / streaming

Protocolo de reconstituição

Para cada fluxo:

  1. Trigger — tipo + assinatura exata + [evidence: file:line]
  2. Happy Path — sequência numerada de steps, cada um com file:line e side effect (se houver)
  3. Edge Cases — cada if/switch/try-catch no caminho
  4. Estado Mutado — tabela de recurso × operação (DB, cache, fila, fs, API externa)
  5. Falhas Possíveis — cada throw/raise/return error + tratamento + response final
  6. Suspeitas — inconsistências (ex: side effect fora de transação, timeout não configurado)

Output

# Fluxo: <nome>

**Trigger:** [POST /api/orders | $ npm run migrate | cron 0 * * * *]
**Confidence:** high | medium | low
**Módulos envolvidos:** [list]

## Happy Path
1. **Entry** — src/routes/orders.ts:12 — recebe payload
2. **Auth** — src/middleware/auth.ts:34 — valida JWT
3. **Service** — src/services/orderService.ts:89
   → side effect: INSERT em `orders`
4. **Response** — 201 com `{ orderId }`

## Edge Cases
- **Estoque insuficiente** [src/services/inventory.ts:55] → 409

## Estado Mutado
| Step | Recurso | Operação |
|------|---------|----------|
| 3    | `orders` | INSERT |

## Falhas Possíveis
- ZodError (step 1) → 400
- DBError (step 3) → 500, rollback automático

## Suspeitas
- step 4 não está em transação com step 3 — risco de inconsistência

Read the full file on GitHub · 88 lines

Changes

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.

  1. 12d ago First seen · 88 lines · 97 tokens per session scan A fcc2fdccbd77

Subscribe to this mod's changes

detective-flows is an agent published in the GitHub repository felvieira/claude-skills-fv (23 stars, last pushed yesterday), licensed Apache-2.0. It adds 97 tokens to every session and 1,014 once invoked, about $0.0005 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.