Borrowing it
Nothing to install: this file belongs to CCDawn/codex-skills. 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/CCDawn/codex-skills/main/CLAUDE.mdgit clone --depth 1 https://github.com/CCDawn/codex-skillsWrote 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/ccdawn/codex-skills/claude-md)<a href="https://agentmods.dev/instructions/ccdawn/codex-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/ccdawn/codex-skills/claude-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/ccdawn/codex-skills/claude-md"><img src="https://agentmods.dev/badge/instructions/ccdawn/codex-skills/claude-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 | $0.00357 | $0.00357 |
| Opus 5.5 | $0.00143 | $0.00143 |
| Sonnet 5.5 | $0.00071 | $0.00071 |
| Haiku 4.5 | $0.00036 | $0.00036 |
Grade A, and why
codex-skills CLAUDE.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.
What it actually says
Skills are organized into bucket folders under skills/:
engineering/- code work and implementation workflowsresearch/- research planning, evidence synthesis, and paper-readiness workflows
Every skill in engineering/ or research/ must have:
- a reference in the top-level
README.md - an entry in
.claude-plugin/plugin.json
Published skills in this repository must also follow the live-install rules:
- the skill folder name must match the
namefield inSKILL.md - the default local install target is
~/.codex/skills/<briefbound-skill-name> - use
~/.agents/skills/<briefbound-skill-name>only when you explicitly need an extra local catalog copy - installing the same skill into both
.codex/skillsand.agents/skillscan produce duplicate slash-command entries - the default install shape is a real directory, not a symlink or junction
- after updating a skill, validate the installed live Codex copy before treating the change as done
- after updating install metadata or
agents/openai.yaml, inspect the installed live copy and restart Codex before concluding that the slash-command change failed - keep
agents/openai.yamlaligned with the minimal working shape already used in this repo: aninterface:block with a distinctivedisplay_name,short_description, anddefault_prompt - if the current trusted workspace is this repository, remember that
.claude-plugin/plugin.jsoncan also influence visible skill entries during slash-command debugging
Each bucket folder should have a README.md that lists every skill in the bucket with a one-line description, and each skill name should link to its SKILL.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.
- 1mo ago First seen · 24 lines · 357 tokens per session scan A 8319a2a881f7
codex-skills CLAUDE.md is an instructions file published in the GitHub repository CCDawn/codex-skills (6 stars, last pushed 1mo ago), licensed MIT. It adds 357 tokens to every session, about $0.0014 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.
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