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 JakubMikolajek/codex-skills-collection --skill skill-creatorgit clone --depth 1 https://github.com/JakubMikolajek/codex-skills-collectionWrote 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/jakubmikolajek/codex-skills-collection/skill-creator)<a href="https://agentmods.dev/skills/jakubmikolajek/codex-skills-collection/skill-creator"><img src="https://agentmods.dev/badge/skills/jakubmikolajek/codex-skills-collection/skill-creator/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/jakubmikolajek/codex-skills-collection/skill-creator"><img src="https://agentmods.dev/badge/skills/jakubmikolajek/codex-skills-collection/skill-creator.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 | $0.00042 | $0.01366 |
| Opus 5 | $0.00021 | $0.00683 |
| Sonnet 5 | $0.00008 | $0.00273 |
| Haiku 4.5 | $0.00004 | $0.00137 |
Grade A, and why
skill-creator 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.
How it starts
The opening of the file, as written. The whole thing — 128 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Creator
This skill provides a systematic process for creating new skills and integrating them into the routing tree. It enforces quality gates, prevents duplicates, and ensures every new skill is reachable from the root router (AGENTS.md).
Path convention: In this source repo,
AGENTS.mdandskills/live at repo root. In bootstrapped target projects, they live inside.codex/. Allskills/...paths below are relative to the directory containingAGENTS.md.
When to Use
- User requests a new capability not covered by any existing skill
- An existing skill is doing too many unrelated things and needs to be split
- A new technology or framework needs dedicated skill coverage
- Routing tree has a gap (skill exists but is unreachable from
AGENTS.md)
When NOT to Use
- Task merely uses an existing skill — do not enter this skill for normal skill consumption
- Task is about editing skill content to fix a typo or update a rule — edit directly without scaffolding
- Task is about reorganizing routing files without creating new skills — edit routing files directly
Core Principles
Audit Before Creating
- Read all existing SKILL.md files before scaffolding anything
- Search for partial coverage — a new skill may already exist under a different name
- If overlap found: extend the existing skill, do not create a duplicate
- Check the routing tree to confirm the gap is real, not a routing misconfiguration
Naming and Placement
- Folder name: lowercase, hyphenated, technology or action-based (e.g.
debug-trace,react-nextjs) - One skill = one folder = one SKILL.md
- Determine domain branch before writing: FRONTEND / BACKEND / INFRA / DATA / WORKFLOW
- Name by capability, not by implementation detail
Routing Must Be Updated in the Same Task
- Never create a skill without updating the relevant routing branch file (e.g.
skills/routing/WORKFLOW.md) - If the skill belongs to a stack sub-branch (e.g.
skills/routing/REACT.md), update that file too - If no suitable sub-branch exists, evaluate whether to create one or attach directly to the domain branch
- Verify reachability from
AGENTS.mdthrough the routing tree after updating
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 · 128 lines · 42 tokens per session scan A 90dc900b7134
skill-creator is a skill published in the GitHub repository JakubMikolajek/codex-skills-collection (5 stars, last pushed 6d ago), licensed MIT. It adds 42 tokens to every session and 1,366 once invoked, about $0.0002 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 2026-08-31.
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