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/serein-nyx/codex-proof/agents-mdgit clone --depth 1 https://github.com/serein-nyx/codex-proofWrote 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/serein-nyx/codex-proof/agents-md)<a href="https://agentmods.dev/instructions/serein-nyx/codex-proof/agents-md"><img src="https://agentmods.dev/badge/instructions/serein-nyx/codex-proof/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 | $0.00163 | $0.00163 |
| Opus 5 | $0.00081 | $0.00081 |
| Sonnet 5 | $0.00033 | $0.00033 |
| Haiku 4.5 | $0.00016 | $0.00016 |
Grade A, and why
codex-proof 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 instructions
Scope
- Keep
codex-proofdependency-free at runtime. - Support Windows, macOS, and Linux with Python 3.11 or newer.
- Preserve the evidence schema unless a versioned migration is included.
- Never record environment variables or unredacted credentials in evidence output.
Workflow
- Inspect existing changes before editing.
- Add or update tests for behavior changes.
- Run the Skill validator after changing
.agents/skills/codex-proof. - Run
python -m unittest discover -s tests -vbefore completion. - Exercise the installed console entry point for CLI changes.
Completion
- Keep structural, test, runtime, behavior, visual, and artifact claims separate.
- Report exact commands and observable results.
- Leave failed or pending claims visible.
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 · 23 lines · 163 tokens per session scan A 3c14e9ef843d
codex-proof AGENTS.md is an instructions file published in the GitHub repository serein-nyx/codex-proof (11 stars, last pushed 22d ago), licensed MIT. It adds 163 tokens to every session, about $0.0008 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 2026-08-30.
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