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 devinilabs/pro-skill --skill book-serif-indexgit clone --depth 1 https://github.com/devinilabs/pro-skillWrote 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/devinilabs/pro-skill/book-serif-index)<a href="https://agentmods.dev/skills/devinilabs/pro-skill/book-serif-index"><img src="https://agentmods.dev/badge/skills/devinilabs/pro-skill/book-serif-index/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/devinilabs/pro-skill/book-serif-index"><img src="https://agentmods.dev/badge/skills/devinilabs/pro-skill/book-serif-index.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 | $0.00033 | $0.00858 |
| Opus 5 | $0.00016 | $0.00429 |
| Sonnet 5 | $0.00007 | $0.00172 |
| Haiku 4.5 | $0.00003 | $0.00086 |
Grade A, and why
book-serif-index 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 9d 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.
This is a copy
100% identical to book-serif-index — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.
How it starts
The opening of the file, as written. The whole thing — 53 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Book Serif Index Skill
Use When
- Create an archival book-reader design system with serif-led pages, mono index navigation, aged paper surfaces, margin notes, and a premium catalog frame.
Workflow
Scope
- Apply this as a full design-system direction when the interface should feel like a curated archival reader, manuscript viewer, or premium literary catalog.
- Use it for editorial experiences, story-driven product pages, archives, research interfaces, lore systems, or reading-centric layouts that need bookish structure and index navigation.
- This is not generic blog styling; it should combine immersive book surfaces with a technical or catalog-like outer frame.
Visual target
- Create a central reading surface that feels like an open book, folio spread, or archival document laid within a darker surrounding interface shell.
- Let typography lead the experience: display serif or gothic-inspired headings, readable serif body text, and mono utility labels for navigation, metadata, and indexing.
- Use aged paper tones, subtle texture, crease shadows, edge shading, and light wear so the main content surface feels tactile and collected.
- Surround the reading area with restrained index or catalog UI: sidebar sections, chapter markers, section lists, archive labels, or mono navigation rails.
- Keep the palette restrained and atmospheric: dark outer shell, warm paper interior, muted ink tones, and one selective accent color derived from the design. If no brand accent exists, a subdued oxblood, bronze, or antique gold is acceptable.
Implementation guidance
- Prefer a two-zone composition: a darker outer interface frame plus a lighter book-like content surface centered inside it.
- Use serif body copy with generous line height for readability, then pair it with mono labels, tracking-heavy section names, and quiet metadata for contrast.
- Build the book surface with gradients, inset shadows, subtle center crease treatment, edge shadows, and light paper texture so it reads as layered material rather than a flat beige card.
- Include index-like navigation patterns such as chapter lists, section trees, archive groupings, or sidebar entries with active states and small markers.
- Add scholarly details like drop caps, marginalia boxes, block labels, annotations, citations, folio markers, or footer metadata to reinforce the editorial system.
- Motion should stay calm and literary: masked text reveals, gentle entrance motion, slow ambient background drift, and restrained hover cues.
What ships with it
7 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.
- 9d ago First seen · 53 lines · 33 tokens per session scan A d53a95a47bb0
book-serif-index is a skill published in the GitHub repository devinilabs/pro-skill (24 stars, last pushed 27d ago), licensed MIT. It adds 33 tokens to every session and 858 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. It is 100% identical to book-serif-index, differing in 0 lines, and is treated as a copy.
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