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brain-mcp: Instructions file for Claude Code

CLAUDE.md

brain-mcp CLAUDE.md is an instructions file for Claude Code from GuiLopes29/brain-mcp. It costs 1,169 tokens per session, scanned A, original, MIT.

Project instructions for Brain MCP, a semantic memory server that stores decisions, solutions, and lessons so they can be searched by meaning.

In plain words
What is it for?
Use them to retrieve project guidelines, save knowledge, search stored knowledge, start the API, and optionally run the knowledge-graph interface.
Why use it?
They explain how to start the server and its optional web interface, and how its tools are intended to be used.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is GuiLopes29/brain-mcp's own configuration. It tells Claude Code how to work on brain-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 brain-mcp configures →

not rated 0repo 3mo ago A scan 1,169 tokens original MIT
View source ↗ GuiLopes29/brain-mcp
Reuse

Borrowing it

Nothing to install: this file belongs to GuiLopes29/brain-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/GuiLopes29/brain-mcp/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/GuiLopes29/brain-mcp

Made for: Claude Code.

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Per session 1,169 This file is loaded in full into every session.
When invoked 1,169 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 $0.01169 $0.01169
Opus 5.5 $0.00468 $0.00468
Sonnet 5.5 $0.00234 $0.00234
Haiku 4.5 $0.00117 $0.00117

Measured 2mo ago against content hash e8773ab2fed7, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

brain-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 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 · 95 lines

How it starts

The opening of the file, as written. The whole thing — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Brain MCP

Semantic memory server for Claude and Cursor. Stores knowledge, decisions, and learned solutions as vector embeddings, searchable via natural language.

Architecture

packages/mcp-server/   — Node.js MCP server (stdio) + HTTP bridge (Express :3456)
packages/brain-ui/     — React + Vite UI (force-directed knowledge graph, :5173)
SQLite                 — Metadata + vectors (sqlite-vec), packages/mcp-server/data/brain.db

No Docker, no local Ollama — vectors live in the same SQLite file as everything else via sqlite-vec, and embeddings run in-process via @huggingface/transformers (Transformers.js).

Starting the stack

# 1. Start HTTP bridge (for the UI) — first run downloads the embedding model (ONNX, cached locally)
pnpm start:api      # http://127.0.0.1:3456

# 2. Start UI (optional)
pnpm dev:ui         # http://localhost:5173

MCP Tools

Tool Purpose
get_guidelines Token-cheap. Compact rules + pitfalls for a project (one-line directives). Call once at task start.
add_knowledge Store a solution, decision, or learning (with kind + directive)
search_knowledge Semantic search across all stored knowledge
list_knowledge List items, with optional project/tag filters
update_knowledge Edit an existing item (re-embeds automatically)
delete_knowledge Permanently remove an item by id

All tools accept a source field (claude / cursor / browser / manual) used by the Control Room dashboard for attribution.

Active-improvement loop (token-controlled)

The Brain is not just storage — it actively shapes how AIs work:

  1. At task start, the consuming AI calls get_guidelines(project) ONCE → gets ≤12 one-line directives (rules to follow, pitfalls to avoid). Cheap (~hundreds of tokens), not thousands.
  2. On solving something, it stores knowledge with a kind (solution/rule/pitfall/decision) and a one-line directive.
  3. Next session, those directives surface via get_guidelines → the lesson is reinforced, the vício is avoided.

Read the full file on GitHub · 95 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 · 95 lines · 1,169 tokens per session scan A e8773ab2fed7

Subscribe to this mod's changes

brain-mcp CLAUDE.md is an instructions file published in the GitHub repository GuiLopes29/brain-mcp (0 stars, last pushed 3mo ago), licensed MIT. It adds 1,169 tokens to every session, about $0.0047 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.

Memory and context
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