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 Kevin-Liu-01/Sigil-UI --skill sigil-playbookgit clone --depth 1 https://github.com/Kevin-Liu-01/Sigil-UIWrote 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/kevin-liu-01/sigil-ui/sigil-playbook)<a href="https://agentmods.dev/skills/kevin-liu-01/sigil-ui/sigil-playbook"><img src="https://agentmods.dev/badge/skills/kevin-liu-01/sigil-ui/sigil-playbook/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/kevin-liu-01/sigil-ui/sigil-playbook"><img src="https://agentmods.dev/badge/skills/kevin-liu-01/sigil-ui/sigil-playbook.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 | $0.00004 | $0.02550 |
| Opus 5 | $0.00002 | $0.01275 |
| Sonnet 5 | $0.00001 | $0.00510 |
| Haiku 4.5 | $0.00000 | $0.00255 |
Grade A, and why
sigil-playbook 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 — 242 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Sigil Playbook — The Page Composition Skill
Read this before building any page in the Sigil aesthetic.
The Sigil Playbook codifies the small vocabulary of structural patterns that make any new page "just work." Originating from the Reticle design language (Dedalus monorepo), these 10 rules — 6 compositional moves + 4 supporting patterns — replace dozens of ad-hoc layout decisions.
Quick Reference: The 10 Rules
| # | Rule | Component | What It Does |
|---|---|---|---|
| 1 | Gap-Pixel Grid | GapPixelGrid + GapPixelCell |
Hairline-divided cells via gap-px + bg-[var(--s-border)] |
| 2 | Mono-Uppercase Label | MonoLabel |
font-mono text-[10px] uppercase tracking-[0.2em] for all chrome |
| 3 | Section Border Stack | BorderStack |
Sections separated by border-t, not spacing or shadows |
| 4 | Accent Singleton | AccentCTA + AccentActive |
One color breaks monochrome: primary fill + glow hover |
| 5 | Tabular-Nums | TabularValue |
font-mono tabular-nums for prices, metrics, dates |
| 6 | Featured-Plus-Grid | FeaturedGrid |
Hero item 2fr + side 1fr, then gap-px grid below |
| 7 | Density DNA | DensityText |
Type scale: chrome 10px → body 14px → headline 2xl+ |
| 8 | Frosted Panel | FrostedPanel |
Drawers/navbars: bg/80 + backdrop-blur-lg with edge border |
| 9 | Card Cell | CardCell |
Card for gap-pixel grids: display title, mono footer strip |
| 10 | The Universal Shell | SigilFrame (existing) |
5-column grid: margin | gutter | content | gutter | margin |
The Universal Shell (Already Exists)
Every page inherits the same skeleton via SigilFrame/SigilPageGrid:
SigilFrame
SigilPageGrid [margin | gutter | content (max 1280px) | gutter | margin]
sticky nav (frosted: bg/80 + backdrop-blur-lg)
flex-1 content
footer
New pages automatically get visible gutters, margin rails, and the content column. You never have to think about outer chrome — it's inherited.
Move 1: The Gap-Pixel Grid
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 · 242 lines · 4 tokens per session scan A 5e7e7c8cc8f4
sigil-playbook is a skill published in the GitHub repository Kevin-Liu-01/Sigil-UI (9 stars, last pushed 1mo ago), licensed MIT. It adds 4 tokens to every session and 2,550 once invoked, about $0.0000 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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