What is everything-codex AGENTS.md?

Repository instructions for everything-codex, a toolkit that configures OpenAI Codex CLI with skills, rules, and workflows. They describe coding standards, file organization, validation, error handling, and Git practices.

Use them when working in the everything-codex repository, including installation, configuration, coding, testing, documentation, and pull-request preparation.

They give a coding agent consistent project rules, such as avoiding changes to existing objects, checking external input, and handling errors clearly. This reduces inconsistent or unsafe edits.

How Luohaothu/everything-codex configures Codex and OpenCode

Reuse

Borrowing it

Nothing to install: this file belongs to Luohaothu/everything-codex. 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/Luohaothu/everything-codex/main/AGENTS.md

Clone the repo

git clone --depth 1 https://github.com/Luohaothu/everything-codex

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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/luohaothu/everything-codex/agents-md/github.svg)](https://agentmods.dev/instructions/luohaothu/everything-codex/agents-md)

Your own site

<a href="https://agentmods.dev/instructions/luohaothu/everything-codex/agents-md"><img src="https://agentmods.dev/badge/instructions/luohaothu/everything-codex/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/luohaothu/everything-codex/agents-md"><img src="https://agentmods.dev/badge/instructions/luohaothu/everything-codex/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 1,067 This file is loaded in full into every session.

When invoked 1,067 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.

Model	Per session	Once invoked
Fable 5.1	$0.01067	$0.01067
Opus 5.5	$0.00427	$0.00427
Sonnet 5.5	$0.00213	$0.00213
Haiku 4.5	$0.00107	$0.00107

Measured 2mo ago against content hash 825fb4171653, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

everything-codex 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.

AGENTS.md · 133 lines

How it starts

The opening of the file, as written. The whole thing — 133 lines — stays where its author put it; the contents beside it link to each section on GitHub.

everything-codex

A comprehensive configuration toolkit for OpenAI Codex CLI with 60+ skills, hierarchical rules, execution policies, and structured workflows.

Quick Start

Install: ./scripts/install.sh
Inside Codex: /configure-codex to customize
Use skills: /plan, /code-review, /tdd, /security-review

Coding Standards

Immutability (CRITICAL)

ALWAYS create new objects, NEVER mutate existing ones. Immutable data prevents hidden side effects, makes debugging easier, and enables safe concurrency.

File Organization

MANY SMALL FILES > FEW LARGE FILES:

High cohesion, low coupling
200-400 lines typical, 800 max
Organize by feature/domain, not by type

Error Handling

ALWAYS handle errors explicitly at every level. Provide user-friendly messages in UI code, detailed context in server logs. Never silently swallow errors.

Input Validation

ALWAYS validate at system boundaries. Use schema-based validation. Fail fast with clear error messages. Never trust external data.

Git Workflow

Commit Format

<type>: <description>

<optional body>

Types: feat, fix, refactor, docs, test, chore, perf, ci

Pull Request Process

Analyze full commit history (not just latest commit)
Use git diff [base-branch]...HEAD to see all changes
Draft comprehensive PR summary with test plan
Push with -u flag for new branches

Feature Implementation

Plan first -- use /plan skill
TDD approach -- use /tdd skill (RED -> GREEN -> REFACTOR)
Code review -- use /code-review skill
Commit with conventional format

Security Guidelines

Mandatory Checks Before Any Commit

No hardcoded secrets (API keys, passwords, tokens)
All user inputs validated
SQL injection prevention (parameterized queries)
XSS prevention (sanitized HTML)
CSRF protection enabled
Authentication/authorization verified
Rate limiting on endpoints
Error messages don't leak sensitive data

Secret Management

NEVER hardcode secrets. ALWAYS use environment variables or a secret manager. Validate required secrets at startup.

Read the full file on GitHub · 133 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.

2mo ago First seen · 133 lines · 1,067 tokens per session scan A 825fb4171653

Subscribe to this mod's changes

everything-codex AGENTS.md is an instructions file published in the GitHub repository Luohaothu/everything-codex (25 stars, last pushed 2mo ago), licensed MIT. It adds 1,067 tokens to every session, about $0.0043 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.

Building agents

everything-codex AGENTS.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
everything-codex AGENTS.mdLuohaothu/everything-codex	Instructions file	25	2mo ago	MIT	A	1,067	Codex, OpenCode
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

everything-codex: Instructions file for Codex