Borrowing it
Nothing to install: this file belongs to Zts0hg/codexspec. 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/Zts0hg/codexspec/main/AGENTS.mdgit clone --depth 1 https://github.com/Zts0hg/codexspecWrote 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/zts0hg/codexspec/agents-md)<a href="https://agentmods.dev/instructions/zts0hg/codexspec/agents-md"><img src="https://agentmods.dev/badge/instructions/zts0hg/codexspec/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/zts0hg/codexspec/agents-md"><img src="https://agentmods.dev/badge/instructions/zts0hg/codexspec/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 | $0.01984 | $0.01984 |
| Opus 5.5 | $0.00794 | $0.00794 |
| Sonnet 5.5 | $0.00397 | $0.00397 |
| Haiku 4.5 | $0.00198 | $0.00198 |
Grade A, and why
codexspec 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 12d 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 — 149 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
CodexSpec
This project uses CodexSpec for requirements-first spec-driven development.
Use these Codex skills when working on CodexSpec workflows:
$codexspec:constitutionto create or update project principles.$codexspec:specifyto capture confirmed requirements.$codexspec:blueprintto discuss and maintain confirmed requirements in the shared blueprint.$codexspec:generate-specto producespec.md.$codexspec:spec-to-designto producedesign.md.$codexspec:design-to-planto produceplan.md.$codexspec:plan-to-tasksto producetasks.md.$codexspec:implement-tasksto implement approved tasks.$codexspec:auto-devto develop pending blueprint requirements autonomously in document order.$codexspec:distillto capture reusable cross-feature knowledge into.codexspec/profile/.$codexspec:evolveto contribute vetted profile knowledge back upstream via a reviewed PR.
Before making workflow decisions, read .codexspec/memory/constitution.md.
Maintainer Guide (developing CodexSpec itself)
This section is hand-authored (outside the managed block above) and applies whether you use Codex or Claude Code — the two context files are equal-status entry points.
The full maintainer development guide lives in CLAUDE.md: architecture and per-feature design notes, the self-bootstrap rule (edit templates/ and src/codexspec/, never the derived .claude/commands/ or .agents/skills/), and the two-constitutions distinction. It imports the project constitution (.codexspec/memory/constitution.md) and the repository layout / packaging boundary (docs/internal/repository-layout.md).
Read CLAUDE.md and docs/internal/repository-layout.md before changing templates, packaging, or init behavior.
Repository Documentation Maintenance
The repo-only Codex skills $codexspec:translate-docs and
$codexspec:check-i18n-semantics maintain root README translations and site docs.
Use --readme --lang all for all seven root README variants. Their shared rules
live in internal/references/doc-translation.md.
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.
- 12d ago Changed · +3 lines · +32 tokens per session db6481ddbee1
- 15d ago Changed · +14 lines · +173 tokens per session 6b52641ef4b7
- 17d ago Changed · +62 lines · +691 tokens per session 830d7c34fddd
- 18d ago Changed · +20 lines · +226 tokens per session cde7de6dd230
- 19d ago Changed 6f7f23fa87cf
- 1mo ago Changed · +2 lines · +39 tokens per session d8376579d639
- 2mo ago First seen · 48 lines · 823 tokens per session scan A 12f67ff395c4
codexspec AGENTS.md is an instructions file published in the GitHub repository Zts0hg/codexspec (6 stars, last pushed 11d ago), licensed MIT. It adds 1,984 tokens to every session, about $0.0079 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 2026-08-31.
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).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.