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 thesongzhu/Friday --skill skill-structure-advisorgit clone --depth 1 https://github.com/thesongzhu/FridayWrote 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/thesongzhu/friday/skill-structure-advisor)<a href="https://agentmods.dev/skills/thesongzhu/friday/skill-structure-advisor"><img src="https://agentmods.dev/badge/skills/thesongzhu/friday/skill-structure-advisor/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/thesongzhu/friday/skill-structure-advisor"><img src="https://agentmods.dev/badge/skills/thesongzhu/friday/skill-structure-advisor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00000 | $0.00328 |
| Opus 5 | $0.00000 | $0.00164 |
| Sonnet 5 | $0.00000 | $0.00066 |
| Haiku 4.5 | $0.00000 | $0.00033 |
Grade A, and why
skill-structure-advisor 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 10d 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
Skill Structure Advisor
Helps you choose the right design pattern and structure for a new skill.
Design patterns: Inversion + Reviewer
Interview Protocol (Inversion)
Phase 1 — What does the skill do?
Ask the user:
- What is the skill's primary job? (e.g., "review code", "generate a report", "wrap a library")
- Does it produce structured output, or evaluate/score something?
Phase 2 — How does it interact?
Ask the user: 3. Does the skill need to gather information from the user before acting? 4. Is there a multi-step process with approval gates, or is it a single action?
Phase 3 — What resources does it need?
Ask the user: 5. Does it reference external docs, checklists, or templates?
Gate
DO NOT recommend a pattern until all three phases are complete.
Pattern Selection (Reviewer)
Once all phases are answered, evaluate against the decision tree in references/pattern-decision-tree.md.
Output
Produce:
- Recommended pattern(s) — one or two from: tool-wrapper, generator, reviewer, inversion, pipeline.
- Suggested directory structure — which files go in SKILL.md, references/, assets/, scripts/.
- SKILL.md skeleton — a starter template following the recommended pattern.
- Rationale — why this pattern fits and what alternatives were considered.
Typical triggers:
help me structure a new skillwhich design pattern should I useskill architecture advice
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.
- 10d ago First seen · 44 lines · 0 tokens per session scan A 1bc1c3fc1b3e
skill-structure-advisor is a skill published in the GitHub repository thesongzhu/Friday (838 stars, last pushed 1mo ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 328 tokens. 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 2026-08-30.
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