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 mcncarl/yichen-skills --skill yichen-codex-chatgptgit clone --depth 1 https://github.com/mcncarl/yichen-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/mcncarl/yichen-skills/yichen-codex-chatgpt)<a href="https://agentmods.dev/skills/mcncarl/yichen-skills/yichen-codex-chatgpt"><img src="https://agentmods.dev/badge/skills/mcncarl/yichen-skills/yichen-codex-chatgpt.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 2 findings, up to medium
These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →
- medium Excessive Agency · line 32 Skill enables autonomous high-impact decisions without human-in-the-loop verification. Critical operations (destructive commands, financial transactions, data deletion) should require explicit user confirmation.Fix: Add human-in-the-loop confirmation for destructive, irreversible, or high-impact operations. Never auto-execute commands that modify files, send data, or alter system state.
- low Excessive Agency · line 102 Skill's behavior or capabilities extend beyond its stated purpose. Scope creep allows an agent to perform actions unrelated to its documented functionality, increasing the attack surface.Fix: Limit the skill's scope to its documented purpose. Remove instructions that enable the agent to perform actions outside its stated functionality.
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 | $0.00175 | $0.03080 |
| Opus 5 | $0.00088 | $0.01540 |
| Sonnet 5 | $0.00035 | $0.00616 |
| Haiku 4.5 | $0.00017 | $0.00308 |
Grade A, and why
yichen-codex-chatgpt 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.
The source is not reproduced here
A licence we could not identify
The repository carries a LICENSE file, but it is custom or dual enough that GitHub cannot name it and neither can this catalogue. Unknown terms are not permission, so the body is not copied here. Read the licence at the source and decide for yourself.
What ships with it
16 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.
- .gitignore 81 B
- agents/openai.yaml 428 B
- config.example.md 757 B
- examples/routing-prompts.md 10 KB
- LICENSE 242 B
- README.md 4.6 KB
- references/browser-session.md 15 KB
- references/browser-surface-ladder.md 15 KB
- references/c2c-protocol.md 21 KB
- references/chat-pro-selection.md 5.0 KB
- references/hybrid.md 3.8 KB
- references/local-code.md 5.6 KB
- references/research.md 7.2 KB
- references/review.md 8.2 KB
- references/setup.md 3.7 KB
- SECURITY.md 1.3 KB
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 · 122 lines · 175 tokens per session scan A c8d1c74a2109
yichen-codex-chatgpt is a skill published in the GitHub repository mcncarl/yichen-skills (2,094 stars, last pushed 2d ago), with no licence file. It adds 175 tokens to every session and 3,080 once invoked, about $0.0009 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 2026-09-03.
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