Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx agentmods add instructions/spillwavesolutions/agent-brain/agents-mdgit clone --depth 1 https://github.com/SpillwaveSolutions/agent-brainWhat 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 | $0.02241 | $0.02241 |
| Opus 5 | $0.01120 | $0.01120 |
| Sonnet 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 2d 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.
- 2d 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 (117 stars, last pushed 2d ago), licensed MIT. It adds 2,241 tokens to every session, about $0.0112 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 2026-08-30.
Other instructions, from other repositories
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
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).
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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 oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.