Borrowing it
Nothing to install: this file belongs to SpillwaveSolutions/agent-brain. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/SpillwaveSolutions/agent-brain/main/AGENTS.mdgit clone --depth 1 https://github.com/SpillwaveSolutions/agent-brainWrote 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.
[](https://agentmods.dev/instructions/spillwavesolutions/agent-brain/agents-md)<a href="https://agentmods.dev/instructions/spillwavesolutions/agent-brain/agents-md"><img src="https://agentmods.dev/badge/instructions/spillwavesolutions/agent-brain/agents-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/spillwavesolutions/agent-brain/agents-md"><img src="https://agentmods.dev/badge/instructions/spillwavesolutions/agent-brain/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.02241 | $0.02241 |
| Opus 5.5 | $0.00896 | $0.00896 |
| Sonnet 5.5 | $0.00448 | $0.00448 |
| Haiku 4.5 | $0.00224 | $0.00224 |
Grade A, and why
agent-brain AGENTS.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 1mo 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.
How it starts
The opening of the file, as written. The whole thing — 267 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Brain Agent Guidelines
Instructions for AI agents (Cursor, Windsurf, OpenCode, etc.) when working on this repository.
Planning rule: after any planning step, save the plan to docs/plans/<name>.md before doing work.
Project Overview
Agent Brain is a RAG-based document indexing and semantic search system. It's a monorepo containing:
| Package | Path | Description |
|---|---|---|
| agent-brain-server | agent-brain-server/ |
FastAPI REST API server |
| agent-brain-cli | agent-brain-cli/ |
CLI management tool |
| agent-brain-skill | agent-brain-skill/ |
Claude Code skill |
Technology Stack
- Python: 3.10+
- Build System: Poetry
- Package Installer: uv (preferred over pip)
- Server: FastAPI + Uvicorn
- CLI: Click + Rich
- Vector Store: ChromaDB
- Embeddings: OpenAI text-embedding-3-large
- Indexing: LlamaIndex
Package Installation
IMPORTANT: Always use uv instead of pip for installing packages. It's faster and handles dependencies better.
# Build packages
cd agent-brain-server && poetry build
cd agent-brain-cli && poetry build
# Install with uv (NOT pip)
uv pip install dist/agent_brain_rag-*.whl --force-reinstall
uv pip install dist/agent_brain_cli-*.whl --force-reinstall
Build and Test Commands
agent-brain-server
cd agent-brain-server
poetry install # Install dependencies
poetry run agent-brain-serve # Run server
poetry run pytest # Run tests
poetry run pytest --cov=agent_brain_server # Tests with coverage
poetry run mypy agent_brain_server # Type checking
poetry run ruff check agent_brain_server # Linting
poetry run black agent_brain_server # Format code
agent-brain-cli
cd agent-brain-cli
poetry install # Install dependencies
poetry run agent-brain --help # Show CLI help
poetry run pytest # Run tests
poetry run mypy agent_brain_cli # Type checking
poetry run ruff check agent_brain_cli # Linting
poetry run black agent_brain_cli # Format code
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.
- 1mo ago First seen · 267 lines · 2,241 tokens per session scan A d5ca7aff08eb
agent-brain AGENTS.md is an instructions file published in the GitHub repository SpillwaveSolutions/agent-brain (119 stars, last pushed 1mo ago), licensed MIT. It adds 2,241 tokens to every session, about $0.0090 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 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.