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 | $0.00088 | $0.00971 |
| Opus 5 | $0.00044 | $0.00485 |
| Sonnet 5 | $0.00018 | $0.00194 |
| Haiku 4.5 | $0.00009 | $0.00097 |
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 — 85 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Builder
The difference between a skill that fires reliably and one that never triggers is craft: a description written as a trigger matcher, absolute paths, explicit guardrails. This skill builds skills that work, and puts them where they belong.
Step 1: Mine the workflow
The best skills come from a workflow that just happened. If the user is converting something they did this session, extract from THIS conversation: the exact steps, the paths touched, the mistakes made and corrected. Those corrections become the new skill's Rules section.
Pin down:
- Name: kebab-case, short, specific (
follow-up-radar, nothelper-tool). Check for collisions against every skill already installed in any tier. - Triggers: the literal phrases the user would say. These go in the description, quoted.
- Job: one job. If the skill needs an "and also" clause, that is two skills.
Step 2: Choose the storage tier
| The skill... | Tier | Location |
|---|---|---|
| Only makes sense in this project or workspace | Project | <project>/.claude/skills/<name>/SKILL.md |
| Useful across several workspaces | Shared library | One real folder in a central location, linked into each workspace's .claude/skills/ |
| Generic personal utility, any folder | User-global | ~/.claude/skills/<name>/SKILL.md |
For the shared library tier, create the real folder once and link it in per workspace:
- Windows (no admin rights needed):
New-Item -ItemType Junction -Path "<workspace>\.claude\skills\<name>" -Target "<library>\<name>" - macOS/Linux:
ln -s <library>/<name> <workspace>/.claude/skills/<name>
An edit to the library folder then propagates to every workspace that links it.
Step 3: Scaffold the SKILL.md
Always a folder with a SKILL.md, never a loose file. Frontmatter has exactly two keys:
---
name: <name>
description: <What it does in one sentence. Then the trigger phrases, quoted, so the skill actually fires.>
---
# <Title>
One line: the outcome this skill produces.
## Step 1: ...
## Step 2: ...
## Rules
- The explicit never-do list: what it must not overwrite, delete, send, or invent.
## Output
What the user receives: files, report, chat summary.
What ships with it
1 file 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 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 1mo ago), licensed MIT. It adds 88 tokens to every session and 971 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 2026-08-31.
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