cpf-validador: Instructions file for Claude Code

CLAUDE.md

cpf-validador CLAUDE.md is an instructions file for Claude Code from opastorello/cpf-validador. It costs 2,992 tokens per session, scanned A, original, MIT.

Contributor instructions for cpf-validador, a service that validates Brazilian CPF numbers and provides related tools through a web API and MCP server. They document local and Docker startup commands, ports, architecture, and manual testing.

In plain words
What is it for?
Use them when developing or testing the FastAPI service, its MCP endpoint, authentication, CPF logic, or TRT3 web-scraping service.
Why use it?
They give a coding agent the commands and system layout needed to run and inspect the project without guessing.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions Claude Code.

This is opastorello/cpf-validador's own configuration. It tells Claude Code how to work on cpf-validador itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything cpf-validador configures →

Reuse

Borrowing it

Nothing to install: this file belongs to opastorello/cpf-validador. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/opastorello/cpf-validador/master/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/opastorello/cpf-validador

Made for: Claude Code.

Wrote this? Show the measurements

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Per session 2,992 This file is loaded in full into every session.
When invoked 2,992 The same file — it is already loaded in full.
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 $0.02992 $0.02992
Opus 5 $0.01496 $0.01496
Sonnet 5 $0.00598 $0.00598
Haiku 4.5 $0.00299 $0.00299

Measured yesterday against content hash b55121730e80, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

cpf-validador CLAUDE.md 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 yesterday.

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.

CLAUDE.md · 193 lines

How it starts

The opening of the file, as written. The whole thing — 193 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Guia para o Claude Code ao trabalhar neste repositório.

Comandos

# Instalar dependências (requirements-trt3.txt inclui o PyTorch da CRNN)
pip install -r requirements-trt3.txt

# Rodar localmente (FastAPI + FastMCP na porta 8000)
uvicorn app.main:app --host 0.0.0.0 --port 8000 --reload

# Docker (porta 8002 conforme docker-compose.yaml)
docker compose up --build -d
docker compose down

Testes automatizados (mockam o TRT3, rodam no CI):

pip install -r requirements-dev.txt
ruff check app/
pytest tests/ -v

Testes manuais via:

  • Interface web: http://localhost:8000/
  • FastAPI docs (apenas ENV=development): http://localhost:8000/docs
  • MCP transport: http://localhost:8000/mcp (streamable-http)

Arquitetura

FastAPI (app/main.py) com routers REST + FastMCP 3.0 montado em /mcp. A camada services/ não tem dependência de framework.

app/
├── main.py           # FastAPI — routers + rate limiter + mcp.http_app() em /mcp
├── config.py         # Lê todas as variáveis de ambiente com defaults
├── mcp_server.py     # FastMCP("cpf-validador") — 6 tools wrapping services
├── auth.py           # TokenMiddleware — autenticação via API_TOKEN + controle prod/dev via ENV
├── rate_limit.py     # Limiter compartilhado — main.py e routers/consulta.py precisam do mesmo objeto
├── services/
│   ├── cpf.py        # Lógica pura de CPF (zero deps de framework)
│   └── sources/      # Fontes de consulta — a fonte ativa vem de SOURCE no .env
│       ├── base.py     # ABC Fonte + contrato do retorno + mascarar_cpf (log)
│       ├── __init__.py # Registro preguiçoso + busca em lote (agnóstica de fonte)
│       ├── trt3.py     # TRT3: curl_cffi + CAPTCHA CRNN + pypdf
│       ├── tcu.py      # TCU: API JSON + Altcha (PoW PBKDF2), sem pypdf
│       └── exemplo.py  # Modelo para novas fontes — fictícia, sem rede e sem CAPTCHA
├── routers/
│   ├── cpf.py        # POST /cpf/validate, POST /cpf/variations
│   ├── consulta.py   # POST /consulta/cpf, /cpfs, /buscar-por-mascara, /buscar-por-variacoes
│   └── ui.py         # GET / — interface web com gate de autenticação
└── captcha/
    ├── model.py       # Arquitetura CRNN (CNN + BiLSTM + CTC Loss)
    ├── predictor.py   # Inferência — carrega captcha_model.pt
    ├── dataset.py     # CaptchaDataset com data augmentation
    ├── train.py       # Loop de treino com early stopping + AMP + registry
    ├── collector.py   # Coleta amostras rotuladas do TRT3 (--workers N)
    ├── registry.py    # Versionamento de modelos (models/vN/model.pt + meta.json)
    └── models/        # Histórico de versões treinadas

Read the full file on GitHub · 193 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. yesterday Changed · +91 lines · +1,506 tokens per session b55121730e80
  2. 6d ago First seen · 102 lines · 1,486 tokens per session scan A aed565b62212

Subscribe to this mod's changes

cpf-validador CLAUDE.md is an instructions file published in the GitHub repository opastorello/cpf-validador (22 stars, last pushed 2d ago), licensed MIT. It adds 2,992 tokens to every session, about $0.0150 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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