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 jqaisystems/jqai-ai-skills --skill skill-buildergit clone --depth 1 https://github.com/jqaisystems/jqai-ai-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/jqaisystems/jqai-ai-skills/skill-builder)<a href="https://agentmods.dev/skills/jqaisystems/jqai-ai-skills/skill-builder"><img src="https://agentmods.dev/badge/skills/jqaisystems/jqai-ai-skills/skill-builder/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/jqaisystems/jqai-ai-skills/skill-builder"><img src="https://agentmods.dev/badge/skills/jqaisystems/jqai-ai-skills/skill-builder.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 | $0.00044 | $0.00483 |
| Opus 5.5 | $0.00018 | $0.00193 |
| Sonnet 5.5 | $0.00009 | $0.00097 |
| Haiku 4.5 | $0.00004 | $0.00048 |
Grade A, and why
skill-builder 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 12d 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 — 35 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Builder
Build one reusable capability and verify it with realistic input.
Define and author
- Extract reusable decisions, inputs, outputs, and boundaries. Do not copy private session transcripts, personal operating procedures, or installed third-party bundles.
- Check for overlap and prefer improving an existing skill when the workflow is only a variation.
- Use a lowercase hyphenated folder name and a precise trigger description. Include name and description frontmatter, preserving supported optional metadata when updating.
- Keep instructions concise. Add references for contracts, assets for templates, and scripts when deterministic behavior improves reliability.
- Use relative paths inside the skill. Keep user-specific values in explicitly approved private configuration, not distributed examples.
- Keep agents/openai.yaml consistent with the skill and include its invocation name in the example prompt.
Storage and discovery
Read installation safety before copying or linking.
Current documentation checked 2026-10-14:
- Codex discovers repository/user skills under
.agents/skillsand supports symlinked skill folders. Inspect compatibility locations already in use before proposing migration. Codex documentation. - Claude Code uses project
.claude/skillsand personal~/.claude/skillslocations. Claude Code documentation. - A shared source can be linked into applicable discovery locations after verifying ownership and targets. Do not create duplicate registrations merely because multiple paths exist.
- AGENTS.md and CLAUDE.md provide project routing and constraints. They do not replace native discovery or prove a skill loaded.
Validate and hand off
Run an available structural validator, exercise scripts on disposable fixtures, and forward-test a realistic request. Verify detection in the actual tool after its supported refresh. Distinguish files existing from successful discovery and use.
What ships with it
2 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.
- 12d ago Changed · -50 lines · -44 tokens per session 4034517f2b1f
- 1mo ago First seen · 85 lines · 88 tokens per session scan A cf9b4f7cc818
skill-builder is a skill published in the GitHub repository jqaisystems/jqai-ai-skills (3 stars, last pushed 13d ago), licensed MIT. It adds 44 tokens to every session and 483 once invoked, about $0.0002 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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