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thebrain-mcp: Instructions file for Claude Code

CLAUDE.md

thebrain-mcp CLAUDE.md is an instructions file for Claude Code from yBookoff/thebrain-mcp. It costs 1,173 tokens per session, scanned A, original, MIT.

Working instructions for an MCP server that connects to TheBrain 15, a personal knowledge-management application, through its local API.

In plain words
What is it for?
Use it to implement or maintain tools that read and change TheBrain data while requiring an explicit brain identifier and consent for irreversible actions.
Why use it?
They help prevent ambiguous updates, accidental deletion, truncated notes, and writes to the wrong knowledge base.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: reads .claude/ paths.

This is yBookoff/thebrain-mcp's own configuration. It tells Claude Code how to work on thebrain-mcp 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 thebrain-mcp configures →

not rated 6repo +1 26d ago A scan 1,173 tokens original MIT
View source ↗ yBookoff/thebrain-mcp npmjs.com
Reuse

Borrowing it

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

Made for: Claude Code.

Wrote this? Show the measurements

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README.md
[![agentmods](https://agentmods.dev/badge/instructions/ybookoff/thebrain-mcp/claude-md.svg)](https://agentmods.dev/instructions/ybookoff/thebrain-mcp/claude-md)
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<a href="https://agentmods.dev/instructions/ybookoff/thebrain-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/ybookoff/thebrain-mcp/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 1,173 This file is loaded in full into every session.
When invoked 1,173 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 $0.01173 $0.01173
Opus 5 $0.00587 $0.00587
Sonnet 5 $0.00235 $0.00235
Haiku 4.5 $0.00117 $0.00117

Measured 8d ago against content hash 961cfc663960, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade A, and why

thebrain-mcp 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 8d 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 · 104 lines

How it starts

The opening of the file, as written. The whole thing — 104 lines — stays where its author put it; the contents beside it link to each section on GitHub.

thebrain-mcp — working notes for Claude

An MCP server for TheBrain 15, built on its local API.

Read ARCHITECTURE.md before making non-trivial changes: it carries the reasoning, the measurements, and the reasons certain obvious-looking shortcuts are forbidden. This file is the short form — the rules that bite.

Invariants

These are not preferences. Breaking one is a bug even if the tests pass.

  1. brainId is explicit on every tool. Never infer the active brain from app/state. Writing into whichever brain the user happens to have open is the worst failure this project can produce.
  2. Bad input is isError: true inside the result, never a JSON-RPC error. The model sees the former and can recover; the latter is invisible to it. guard() in src/server/respond.ts enforces this — keep handlers inside it.
  3. Nothing irreversible without human consent, and a failed consent request counts as refusal. Deletion is additionally gated behind THEBRAIN_ALLOW_DESTRUCTIVE=1.
  4. Notes are never truncated on read. A truncated note silently corrupts the agent's picture of what is already recorded.
  5. After a write, address thoughts by identifier, never by name. findByName lags creation by ~5.6 s.
  6. No LLM calls inside the server. Judgement belongs to the calling agent, which can see the conversation. The server stays deterministic and testable.
  7. The server holds no methodology. Heuristics about how to decompose material belong in skills/*/SKILL.md, not in code.

Layout

src/api/          HTTP client, error normalisation, typed resource calls
src/semantic/     vector store, embedder, indexer, search, document builder
src/operations/   ingest (plan → topological write), traverse (BFS)
src/server/       tool definitions, schemas, formatting, confirmation
skills/           methodology as markdown, installed into ~/.claude/skills
test/             unit + contract tests, never shipped

Read the full file on GitHub · 104 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. 8d ago First seen · 104 lines · 1,173 tokens per session scan A 961cfc663960

Subscribe to this mod's changes

thebrain-mcp CLAUDE.md is an instructions file published in the GitHub repository yBookoff/thebrain-mcp (6 stars, last pushed 26d ago), licensed MIT. It adds 1,173 tokens to every session, about $0.0059 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 2026-08-31.

Backend and APIsMemory and contextclaudeknowledge-graphmcpmodel-context-protocolpkmsecond-brain
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