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agent-brain: Instructions file for Codex

AGENTS.md

agent-brain AGENTS.md is an instructions file for Codex, OpenCode from Railly/agent-brain. It costs 815 tokens per session, scanned A, original, MIT.

A template for an agent's personal and project context, including identity, work, goals, software choices, and knowledge files.

In plain words
What is it for?
Recording work context, quarterly and yearly goals, preferred technologies, things to avoid, knowledge-system structure, and recurring commands.
Why use it?
It gives the coding agent stable background information so its suggestions can fit the person's projects, preferences, and priorities.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: reads .claude/ paths; mentions Claude Code.

This is Railly/agent-brain's own configuration. It tells Codex and OpenCode how to work on agent-brain 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 agent-brain configures →

not rated 22repo 3mo ago A scan 815 tokens original MIT
View source ↗ Railly/agent-brain railly.dev
Reuse

Borrowing it

Nothing to install: this file belongs to Railly/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.

Copy the file
curl -O https://raw.githubusercontent.com/Railly/agent-brain/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/Railly/agent-brain

Made for: Codex, OpenCode.

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 agent-brain AGENTS.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/railly/agent-brain/agents-md/github.svg)](https://agentmods.dev/instructions/railly/agent-brain/agents-md)
Your own site
<a href="https://agentmods.dev/instructions/railly/agent-brain/agents-md"><img src="https://agentmods.dev/badge/instructions/railly/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.

agentmods 80×15 button for agent-brain AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/railly/agent-brain/agents-md"><img src="https://agentmods.dev/badge/instructions/railly/agent-brain/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 815 This file is loaded in full into every session.
When invoked 815 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 $0.00815 $0.00815
Opus 5.5 $0.00326 $0.00326
Sonnet 5.5 $0.00163 $0.00163
Haiku 4.5 $0.00081 $0.00081

Measured 2mo ago against content hash f653788fbfe0, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 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.

Origin

Copies of this mod

1 near-identical copy found in the catalogue:

AGENTS.md · 111 lines

How it starts

The opening of the file, as written. The whole thing — 111 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{Your Name}'s Brain

Identity

{Your name}. {Age}. {Location}. {Languages you speak}.

Work

{Primary Role}

{Your role}. {Company/project}. {What you're working on}.

{Secondary Role} (optional)

{Side project, freelance, open source}.

Goals

This Quarter

  • {Goal 1}
  • {Goal 2}
  • {Goal 3}

This Year

  • {Goal 1}
  • {Goal 2}

3-5 Years

  • {Vision statement}

Stack

Always Use

  • {Runtime}: {e.g., Bun, Node, Deno}
  • {Framework}: {e.g., Next.js, Astro}
  • {Database}: {e.g., Postgres, SQLite}
  • {Deploy}: {e.g., Vercel, Cloudflare}

Avoid

  • {Things you don't want the AI suggesting}

Knowledge System

Vault Structure

01_Inbox/           -> Raw captures (Web Clipper)
02_Journal/         -> Daily logs, weekly plans, reflections
03_Garden/          -> Evergreen atomic notes
04_Projects/        -> Active project work
05_Areas/           -> Ongoing life contexts
06_Content/         -> Ready-to-publish drafts
07_System/          -> System config and references

Full reference: 07_System/context-files/knowledge-system.md

Workflows

Command Purpose
/init Guided setup wizard for new users
/morning Morning briefing: calendar, tasks, MITs
/today Daily log + end-of-day reflection + tomorrow prep
/log Quick timestamped entry to daily file
/ship Commit + push + log to daily
/week Weekly planning with MITs
/inbox Process Web Clipper clips into atomic notes
/relink Find missing connections between notes
/vault-search Search vault by keyword and synthesize
/meeting Process meeting notes or recordings (uses trx)
/challenge Argue against your own thinking (anti-sycophancy)
/pulse Weekly Pareto analysis + goal alignment
/draft Create content drafts from ideas
/de-ai Remove AI-generated jargon from text
/research Web research saved to vault

Runtime Surfaces

  • .agents/skills/ is the canonical workflow source
  • .claude/skills/ exposes the workflows to Claude Code
  • .claude/commands/ preserves slash command compatibility

Read the full file on GitHub · 111 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 · 111 lines · 815 tokens per session scan A f653788fbfe0

Subscribe to this mod's changes

agent-brain AGENTS.md is an instructions file published in the GitHub repository Railly/agent-brain (22 stars, last pushed 3mo ago), licensed MIT. It adds 815 tokens to every session, about $0.0033 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.

Memory and context
Related

agent-brain AGENTS.md compared with instructions from other repositories

agent-brain AGENTS.md next to 6 instructions from other repositories
ModTypeStarsLast pushLicenceScanTokensWorks with
agent-brain AGENTS.mdRailly/agent-brainInstructions file223mo agoMITA815Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA9,719GitHub Copilot
next.js AGENTS.mdvercel/next.jsInstructions file143ktodayMITA7,461Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchainInstructions file149kyesterdayMITA4,680Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA5,516GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscodeInstructions file195kyesterdayMITA3,093GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harnessInstructions file274k2d agoMITA4,313Codex, OpenCode