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 skills add zjp1997720/zhijian-skills --skill codex-skill-admingit clone --depth 1 https://github.com/zjp1997720/zhijian-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/skills/zjp1997720/zhijian-skills/codex-skill-admin)<a href="https://agentmods.dev/skills/zjp1997720/zhijian-skills/codex-skill-admin"><img src="https://agentmods.dev/badge/skills/zjp1997720/zhijian-skills/codex-skill-admin/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/skills/zjp1997720/zhijian-skills/codex-skill-admin"><img src="https://agentmods.dev/badge/skills/zjp1997720/zhijian-skills/codex-skill-admin.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00074 | $0.01171 |
| Opus 5 | $0.00037 | $0.00585 |
| Sonnet 5 | $0.00015 | $0.00234 |
| Haiku 4.5 | $0.00007 | $0.00117 |
Grade A, and why
codex-skill-admin scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
Copies of this mod
1 near-identical copy found in the catalogue:
- codex-skill-admin — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Codex Skill Admin
Use Codex's official skill config API. Do not edit SKILL.md frontmatter to disable a skill, and do not uninstall plugins unless the user explicitly asks for uninstall.
Quick Start
Use the bundled script for normal work:
SKILL_DIR="${CODEX_SKILL_ADMIN_DIR:-$HOME/.agents/skills/codex-skill-admin}"
if [ ! -d "$SKILL_DIR" ]; then
SKILL_DIR="${CODEX_HOME:-$HOME/.codex}/skills/codex-skill-admin"
fi
python3 "$SKILL_DIR/scripts/codex_skill_admin.py" list --cwd "$PWD"
python3 "$SKILL_DIR/scripts/codex_skill_admin.py" audit-unused --cwd "$PWD" --days 30
python3 "$SKILL_DIR/scripts/codex_skill_admin.py" disable-unused --cwd "$PWD" --days 30
python3 "$SKILL_DIR/scripts/codex_skill_admin.py" disable-unused --cwd "$PWD" --days 30 --apply
python3 "$SKILL_DIR/scripts/codex_skill_admin.py" disable-unused --cwd "$PWD" --days 10 --max-uses 2
python3 "$SKILL_DIR/scripts/codex_skill_admin.py" verify --cwd "$PWD"
The script starts a temporary localhost codex app-server, calls:
skills/listskills/config/write
It saves apply-mode backups under:
${CODEX_HOME:-$HOME/.codex}/backup/skill-disable-unused-YYYYMMDD-HHMMSS/
Workflow
- Run
listto get the current total, enabled, and disabled counts. - Run
audit-unused --days 30to inspect high-confidence recent usage. - Optionally add
--max-uses Nto include low-frequency skills. Example:--days 10 --max-uses 2targets enabled skills used in at most 2 distinct recent session/source files. - Run
disable-unused --days 30without--applyand inspect the dry-run output. - If the user asked to close unused or low-frequency skills, run
disable-unused --apply. - Verify with
verify, or withlist --force-reloadplusprompt-count. - Report counts, backup path, threshold parameters, and any limits of the usage evidence.
System skills are preserved by default. Use --include-system only when the user explicitly asks to consider system skills too.
The Codex desktop Skills tab count is a total discovered skill count. It is expected to stay unchanged after disabling skills. Treat enabledCount and availableSkillCount as the token-load success metrics.
What ships with it
4 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 11d ago First seen · 109 lines · 74 tokens per session scan A e4520dba0029
codex-skill-admin is a skill published in the GitHub repository zjp1997720/zhijian-skills (595 stars, last pushed 5d ago), licensed MIT. It adds 74 tokens to every session and 1,171 once invoked, about $0.0004 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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