Borrowing it
Nothing to install: this file belongs to yanchuk/claude-plugin-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.
curl -O https://raw.githubusercontent.com/yanchuk/claude-plugin-codex/main/AGENTS.mdgit clone --depth 1 https://github.com/yanchuk/claude-plugin-codexWrote 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/yanchuk/claude-plugin-codex/agents-md)<a href="https://agentmods.dev/instructions/yanchuk/claude-plugin-codex/agents-md"><img src="https://agentmods.dev/badge/instructions/yanchuk/claude-plugin-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.
<a href="https://agentmods.dev/instructions/yanchuk/claude-plugin-codex/agents-md"><img src="https://agentmods.dev/badge/instructions/yanchuk/claude-plugin-codex/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 | $0.00537 | $0.00537 |
| Opus 5.5 | $0.00215 | $0.00215 |
| Sonnet 5.5 | $0.00107 | $0.00107 |
| Haiku 4.5 | $0.00054 | $0.00054 |
Grade A, and why
claude-plugin-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 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 — 60 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Agent Instructions
This repo builds claude-plugin-codex, a Codex plugin that lets Codex consult
local Claude Code for advice, reviews, adversarial checks, and rescue tasks.
Codex remains the orchestrator.
Scope
- Work only in this standalone repo.
- Do not modify
/Users/yanchuk/Documents/GitHub/skill-arsenalfor this project. - Do not commit or push unless the latest user instruction explicitly asks for it.
- Keep plugin metadata public-release ready:
.codex-plugin/plugin.json,.agents/plugins/marketplace.json, andREADME.mdshould stay consistent. - Keep
package.jsonandplugins/claude-code-advisor/.codex-plugin/plugin.jsonon the same version.
Commands
- Run
npm run validatebefore claiming the plugin is ready. - Run
npm run test:smokeafter changes that touch Claude CLI invocation, runtime behavior, or install instructions. - Run
npm run test:e2e:codexafter changes that affect Codex plugin routing, skill instructions, or public install behavior.
Claude Model Policy
- Do not default Claude advisor, review, adversarial-review, rescue, or monitor work to Sonnet.
- Let Claude Code use the user's configured default model unless the user explicitly asks for another model.
- Pass xhigh effort for Claude advisor, review, adversarial-review, rescue, and background work unless the user explicitly asks for another effort.
- Use Sonnet only for junior-agent delegation governed by the
tasks-for-sonnetskill, where Sonnet acts as Hands, scout, verifier, or synthesis worker.
Documentation
- Put public install instructions near the top of
README.md. - Write README and marketplace copy in plain, direct language.
- Do not document unsupported Codex plugin manifest fields as real features.
$claudeis the stable skill command./claudeand/claude:rescueare best-effort aliases only when Codex passes slash-style text through to the skill.
Context7
Use the ctx7 CLI for current documentation when working from docs for a
library, framework, SDK, API, CLI tool, or cloud service:
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 · 60 lines · 537 tokens per session scan A c9ce23721413
claude-plugin-codex AGENTS.md is an instructions file published in the GitHub repository yanchuk/claude-plugin-codex (23 stars, last pushed 5mo ago), licensed MIT. It adds 537 tokens to every session, about $0.0021 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.