Borrowing it
Nothing to install: this file belongs to YankielDBC2/codex-skills-library. 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/YankielDBC2/codex-skills-library/main/.agents/skills/codex-skill-system-bootstrap/SKILL.mdgit clone --depth 1 https://github.com/YankielDBC2/codex-skills-libraryWrote 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/yankieldbc2/codex-skills-library/codex-skill-system-bootstrap)<a href="https://agentmods.dev/skills/yankieldbc2/codex-skills-library/codex-skill-system-bootstrap"><img src="https://agentmods.dev/badge/skills/yankieldbc2/codex-skills-library/codex-skill-system-bootstrap/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/yankieldbc2/codex-skills-library/codex-skill-system-bootstrap"><img src="https://agentmods.dev/badge/skills/yankieldbc2/codex-skills-library/codex-skill-system-bootstrap.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 | $0.00034 | $0.00334 |
| Opus 5.5 | $0.00014 | $0.00134 |
| Sonnet 5.5 | $0.00007 | $0.00067 |
| Haiku 4.5 | $0.00003 | $0.00033 |
Grade A, and why
codex-skill-system-bootstrap 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 2mo 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
Codex Skill System Bootstrap
Goal
Install a lightweight Codex skill system into a target repository without disrupting the project.
When to use
Use when setting up .agents/skills/, AGENTS.md, project notes, reusable prompts, or validation scripts in another repo.
When not to use
Do not use when the target repo already has a mature agent system and only needs one specific skill update.
Inputs
Inspect the target repo root, existing AGENTS.md, package manager files, .gitignore, docs, and current project conventions.
Workflow
- Detect the target project's stack and package manager.
- Create
.agents/skills/only if missing. - Add a concise
AGENTS.mdif missing or improve it if weak. - Add project state docs only if they will be used.
- Copy only relevant skills, not the whole library by default.
- Add validation scripts that fit the target project.
- Ensure secrets are ignored.
- Document how to use the installed skills.
Quality bar
A good bootstrap is minimal, reversible, and aligned with the target repo's existing conventions.
Validation
Run available package checks and confirm no secret files were copied.
Final response
Report installed files, skipped files, validation commands, and how to start the next Codex session.
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.
- 2mo ago First seen · 49 lines · 34 tokens per session scan A 0d10e09e4a06
codex-skill-system-bootstrap is a skill published in the GitHub repository YankielDBC2/codex-skills-library (13 stars, last pushed 3mo ago), licensed MIT. It adds 34 tokens to every session and 334 once invoked, about $0.0001 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.
codex-skill-system-bootstrap compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| codex-skill-system-bootstrapYankielDBC2/codex-skills-library | Skill | 13 | 3mo ago | MIT | A | 34 | Codex |
| forgetful-encode-repoScottRBK/forgetful | Skill | 338 | 4d ago | MIT | A | 68 | Claude Code |
| dotfiles-bootstrapsebastienrousseau/dotfiles | Skill | 81 | yesterday | Apache-2.0 | A | 89 | Claude Code, Codex |
| learn-projectFozikio/cortex-engine | Skill | 51 | 4d ago | MIT | A | 21 | Claude Code, Codex |
| base-release-trainbasefoundry/base | Skill | 120 | yesterday | Apache-2.0 | A | 35 | Codex |
| harness-init-runnerrexleimo/aios | Skill | 62 | yesterday | MIT | A | 68 | Claude Code, Codex |
| self-motivation-bootstrap-pualinkerlin/PUAX | Skill | 325 | 1mo ago | MIT | A | 19 | Claude Code, Codex |