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bruin: Instructions file for Claude Code

CLAUDE.md

bruin CLAUDE.md is an instructions file for Claude Code from sawzhang/bruin. It costs 1,904 tokens per session, scanned A, original, MIT.

A development guide for Bruin, a desktop application with a Rust backend, React frontend, SQLite database, and built-in MCP server. MCP lets AI assistants communicate with software through a standard interface.

In plain words
What is it for?
Use it to develop Bruin, run frontend tests, check or lint its Rust code, build the desktop package, or install and configure its MCP server for Claude Code.
Why use it?
It collects the commands for starting, building, testing, and checking both sides of the application. It also explains how data moves between the AI agent, app, database, and interface.

Instructions file for Claude Code

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

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

not rated 2repo 4mo ago A scan 1,904 tokens original MIT
View source ↗ sawzhang/bruin bruin.me
Reuse

Borrowing it

Nothing to install: this file belongs to sawzhang/bruin. 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/sawzhang/bruin/master/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/sawzhang/bruin

Made for: Claude Code.

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 bruin CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/sawzhang/bruin/claude-md.svg)](https://agentmods.dev/instructions/sawzhang/bruin/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/sawzhang/bruin/claude-md"><img src="https://agentmods.dev/badge/instructions/sawzhang/bruin/claude-md.svg" alt="Measured on agentmods" height="20"></a>
Per session 1,904 This file is loaded in full into every session.
When invoked 1,904 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 $0.01904 $0.01904
Opus 5 $0.00952 $0.00952
Sonnet 5 $0.00381 $0.00381
Haiku 4.5 $0.00190 $0.00190

Measured 7d ago against content hash 408ac0bb874c, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-07, from the pricing page.

Security

Grade A, and why

bruin 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 7d 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 · 118 lines

How it starts

The opening of the file, as written. The whole thing — 118 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

Commands

# Development
npm run tauri dev              # Start app (Vite + Tauri hot reload)
npm run tauri build            # Production build → .dmg in src-tauri/target/release/bundle/

# Frontend tests
npm test                       # Run Vitest once
npm run test:watch             # Watch mode

# Rust checks
cd src-tauri && cargo check    # Type check Rust
cd src-tauri && cargo clippy   # Lint Rust

# MCP server (built into the app binary)
/Applications/Bruin.app/Contents/MacOS/bruin --mcp            # Start MCP server (stdio)
/Applications/Bruin.app/Contents/MacOS/bruin --install-skill   # Install Claude Code skill
/Applications/Bruin.app/Contents/MacOS/bruin --write-config    # Write Claude Code MCP config

Architecture

Bruin is a Tauri 2 desktop app: Rust backend + React 19 frontend with a native MCP server built into the app binary.

Data flow

AI Agent ──MCP (stdio)──► Bruin Binary (Rust) ──► SQLite ◄──IPC──► React Frontend
                                                      │
                                                 iCloud Sync
                                              (bidirectional .md files)

The MCP server runs as the same binary with --mcp flag: bruin --mcp. It accesses SQLite directly — no Node.js required. The GUI app and MCP server share the same database at ~/Library/Application Support/com.bruin.notes/bruin.db.

Frontend (src/)

  • IPC bridge: src/lib/tauri.ts — every Tauri invoke() call is wrapped here. Stores never call invoke() directly.
  • State: Zustand stores in src/stores/ — noteStore, workspaceStore, graphStore, tagStore, activityStore, uiStore. Each store calls functions from tauri.ts and manages its own slice.
  • Editor: TipTap-based rich markdown editor in src/components/editor/.
  • Graph: D3 force-directed visualization in src/components/graph/.
  • Themes: 6 themes defined in src/lib/themes.ts, applied via CSS variables with Tailwind's bear.* namespace.

Read the full file on GitHub · 118 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. 7d ago First seen · 118 lines · 1,904 tokens per session scan A 408ac0bb874c

Subscribe to this mod's changes

bruin CLAUDE.md is an instructions file published in the GitHub repository sawzhang/bruin (2 stars, last pushed 4mo ago), licensed MIT. It adds 1,904 tokens to every session, about $0.0095 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.

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