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mechabrain: Instructions file for Claude Code

CLAUDE.md

mechabrain CLAUDE.md is an instructions file for Claude Code from bbarrosdavi/mechabrain. It costs 1,314 tokens per session, scanned A, original, MIT.

A set of instructions for coding agents working on the Mecha-Brain repository, which contains a command-line tool, an AI-tool server, and templates.

In plain words
What is it for?
Use it when changing or documenting Mecha-Brain's kernel, its templates, or its repository-level agent behaviour.
Why use it?
It clarifies which files and documents are authoritative and prevents deployment-specific details from being added to the core codebase.

Instructions file for Claude Code

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

This is bbarrosdavi/mechabrain's own configuration. It tells Claude Code how to work on mechabrain 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 mechabrain configures →

not rated 0repo 26d ago A scan 1,314 tokens original MIT
View source ↗ bbarrosdavi/mechabrain
Reuse

Borrowing it

Nothing to install: this file belongs to bbarrosdavi/mechabrain. 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/bbarrosdavi/mechabrain/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/bbarrosdavi/mechabrain

Made for: Claude Code.

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Per session 1,314 This file is loaded in full into every session.
When invoked 1,314 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 $0.01314 $0.01314
Opus 5.5 $0.00526 $0.00526
Sonnet 5.5 $0.00263 $0.00263
Haiku 4.5 $0.00131 $0.00131

Measured 2mo ago against content hash 2dc4669b452f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mechabrain 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 2mo 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.

CLAUDE.md · 89 lines

How it starts

The opening of the file, as written. The whole thing — 89 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md — governança do agente no repositório mechabrain

Guia para agentes (Claude e afins) que trabalham neste repositório — o kernel do Mecha-Brain (CLI mechabrain + servidor MCP + templates). O contrato que vai para dentro das vaults hospedeiras é gerado de src/mechabrain/templates/agents.md.tmpl; este arquivo governa o trabalho sobre o código do kernel.

Orientação rápida

  • O que é este repo: o kernel, instalado fora da vault (via uv tool). Ele não contém nenhum caminho, nome de vault ou nome de agente de deployment — esses valores vêm sempre do manifest (_meta/config.yaml). Não codifique nada específico de deployment aqui.
  • Fontes de verdade — a documentação vive na VAULT, não neste repo. A casa canônica da spec normativa é a nota 2026-07-16_DOC_Mecha_Brain_Spec na vault; o setup e os guias são a série de docs do Mechabrain (02_Docs/). Mudança de comportamento do kernel que contradiga a spec exige emenda marcada na spec da vault (via mecha-scribe), citando a versão do kernel — não "no mesmo commit", já que a spec não mora mais no repositório.
  • Nunca documente no repositório. Não crie um docs/ nem specs/guias em Markdown aqui — documentação é conteúdo e vai para a vault (Classe B / mecha-scribe). Exceção única: quando o Davi pedir explicitamente.
  • Idioma: código, docstrings e mensagens de erro em inglês; README e docs de usuário em PT-BR.
  • Dev: 
    uv venv --python 3.13
uv pip install -e ".[dev]"
uv run pytest -q      # testes
uv run ruff check .   # lint

Pilar 1 — Restrição de ferramentas e isolamento de escrita (sandboxing)

O contrato de fronteiras de escrita do host-vault é único e gerado: veja src/mechabrain/templates/agents.md.tmpl §1 (Fronteiras P4) e §2 (tools MCP), deployado como mecha-brain/AGENTS.md. Não repita as regras aqui; se precisarem mudar, edite o template e rode mechabrain sync.

Recorte deste repo (o que o template não cobre):

Read the full file on GitHub · 89 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. 2mo ago First seen · 89 lines · 1,314 tokens per session scan A 2dc4669b452f

Subscribe to this mod's changes

mechabrain CLAUDE.md is an instructions file published in the GitHub repository bbarrosdavi/mechabrain (0 stars, last pushed 26d ago), licensed MIT. It adds 1,314 tokens to every session, about $0.0053 per session on Opus 5.5. 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 2026-08-31.

Related

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