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/phelan164/codex-howto/agents-mdgit clone --depth 1 https://github.com/Phelan164/codex-howtoWrote 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/phelan164/codex-howto/agents-md)<a href="https://agentmods.dev/instructions/phelan164/codex-howto/agents-md"><img src="https://agentmods.dev/badge/instructions/phelan164/codex-howto/agents-md.svg" alt="Measured on agentmods" 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 | $0.00285 | $0.00285 |
| Opus 5 | $0.00143 | $0.00143 |
| Sonnet 5 | $0.00057 | $0.00057 |
| Haiku 4.5 | $0.00028 | $0.00028 |
Grade A, and why
codex-howto 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 4d 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.
What it actually says
Repository guidance
Purpose
Maintain an accurate, engineering-first learning guide for OpenAI Codex.
Editing rules
- Keep product behavior aligned with official OpenAI documentation.
- Label community practices and opinions clearly.
- Do not add credentials, destructive examples, or full-access defaults.
- Keep modules progressive: outcome, concepts, exercise, verification, sources.
- Keep skill bodies concise; put optional detail in direct
references/. - Preserve attribution to
luongnv89/claude-howtoas inspiration. - For work that depends on prior decisions, experiments, or established Codex
guidance, read
knowledge/index.mdfirst and load only relevant pages. - Treat wiki queries as read-only unless the user explicitly requests capture, ingest, archive, or promotion.
Validation
Run:
python3 scripts/validate_repo.py
python3 skills/maintain-codex-wiki/scripts/wiki_lint.py .
For each changed skill, also run:
python3 /path/to/skill-creator/scripts/quick_validate.py skills/<skill-name>
Definition of done
- All relative Markdown links resolve.
- Every skill has valid frontmatter and UI metadata.
- Living-wiki pages have registered sources and pass deterministic lint.
- Examples are safe and contain no placeholder secrets.
- Version-sensitive claims include an official source or verification note.
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.
- 4d ago First seen · 42 lines · 285 tokens per session scan A 87ffc129aba4
codex-howto AGENTS.md is an instructions file published in the GitHub repository Phelan164/codex-howto (3 stars, last pushed 7d ago), licensed MIT. It adds 285 tokens to every session, about $0.0014 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 2026-08-31.
Other instructions, from other repositories
codexia AGENTS.md
AGENTS.md instructions for milisp/codexia, covering agents.md, project info, project tech, common commands and project structure.
CodexPotter AGENTS.md
AGENTS.md instructions for breezewish/CodexPotter, covering repository guidelines, workflow principles, engineering rules, core principles: simplicity & readability and better maintainability.
codex-docs AGENTS.md
AGENTS.md instructions for chenrui333/codex-docs, covering agents notes, scope, generated content boundaries, local workflow and validation expectations.
vibe-codex AGENTS.md
Instructions for kks0488/vibe-codex, covering vibe-codex (codex cli), repo conventions, openai docs and handy commands.
codex-status-bar AGENTS.md
Instructions for yuriipalam/codex-status-bar, covering repository instructions, engineering expectations, verification and release procedure.
ctxwise AGENTS.md
Instructions for FramY2/ctxwise, a project described as: CtxWise — see and control what Codex loads. Local-first context audit, profiles, drift detection, and honest token receipts.