course-builder: Skill for Claude Code

.claude/skills/slide-authoring/SKILL.md

slide-authoring is a skill for Claude Code from tobyilee/course-builder. It costs 57 tokens per session (1,661 once invoked), scanned A, original, MIT.

A guide for creating slide decks in Marp Markdown, a text format that can be rendered into presentation slides. It defines layouts, slide counts, frontmatter, and checks for overflowing content.

In plain words
What is it for?
Use it to turn class content into four-to-seven-slide decks, write Marp Markdown, apply themes and footers, render HTML with the Marp command-line tool, and check slide fit.
Why use it?
It keeps generated presentations consistent and helps avoid broken layouts caused by overcrowded slides or manually written raw HTML.

Skill for Claude Code

Written for Claude Code: installed under .claude/. Also seen: reads .claude/ paths.

This is tobyilee/course-builder's own configuration. It tells Claude Code how to work on course-builder itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything course-builder configures →

Reuse

Borrowing it

Nothing to install: this file belongs to tobyilee/course-builder. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/tobyilee/course-builder/main/.claude/skills/slide-authoring/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/tobyilee/course-builder

Made for: Claude Code.

Wrote 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.

agentmods badge for slide-authoring

README.md
[![agentmods](https://agentmods.dev/badge/skills/tobyilee/course-builder/slide-authoring/github.svg)](https://agentmods.dev/skills/tobyilee/course-builder/slide-authoring)
Your own site
<a href="https://agentmods.dev/skills/tobyilee/course-builder/slide-authoring"><img src="https://agentmods.dev/badge/skills/tobyilee/course-builder/slide-authoring/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.

agentmods 80×15 button for slide-authoring

Your own site · 80×15
<a href="https://agentmods.dev/skills/tobyilee/course-builder/slide-authoring"><img src="https://agentmods.dev/badge/skills/tobyilee/course-builder/slide-authoring.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 57 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,661 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00057 $0.01661
Opus 5.5 $0.00023 $0.00664
Sonnet 5.5 $0.00011 $0.00332
Haiku 4.5 $0.00006 $0.00166

Measured 2mo ago against content hash 85c9a82071a5, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

slide-authoring 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 2mo ago.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/render-marp.sh), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

.claude/skills/slide-authoring/SKILL.md · 153 lines

How it starts

The opening of the file, as written. The whole thing — 153 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Slide Authoring — Marp Markdown

slide는 Marp Markdown으로 작성한 뒤 marp CLI로 HTML 렌더한다. AI가 raw HTML을 직접 쓰면 레이아웃이 깨지기 쉬우므로 반드시 Marp MD 경유.

Marp 프론트매터 표준

---
marp: true
theme: default
paginate: true
footer: "LO-X.Y"
style: |
  section { font-size: 28px; }
  h1 { font-size: 42px; }
  code { font-size: 22px; }
---
  • paginate: true — 우하단 페이지 번호
  • footer는 class의 주 LO id. 슬라이드마다 다른 LO면 슬라이드 안에 <!-- _footer: "LO-X.Z" --> 오버라이드

슬라이드 개수

  • class당 4~7장 고정
  • 공식: beats 개수 + 1 (제목 슬라이드) + (마무리/recap 1)

슬라이드 레이아웃 규칙 (택1)

각 슬라이드는 다음 3가지 중 정확히 하나만 담는다:

A. Bullet 슬라이드 (3~5 bullet)

## 서버 컴포넌트란

- 서버에서 렌더링되는 React 컴포넌트
- 클라이언트 번들에 포함되지 않음
- DB/파일시스템 직접 접근 가능
- Suspense 경계로 스트리밍됨

B. Code 슬라이드 (≤15줄)

## RSC 예시

~~~jsx
// app/posts/page.js
export default async function Page() {
  const posts = await db.query(...);
  return posts.map(p => <Post {...p} />);
}
~~~

C. Diagram 슬라이드 (그림/다이어그램)

Mermaid 내장 가능 (default theme 지원):

## 요청 흐름

~~~mermaid
flowchart LR
  Browser --> Edge --> Server --> DB
~~~

제목 규칙

  • h2 (##) 사용, h1은 제목 슬라이드에만
  • ≤10 단어, 조사 제외
  • 질문형/선언형 섞어서 리듬감 (무엇이 RSC인가 → RSC는 어디에 쓰는가 → RSC 예시)

Overflow 방지

  • 텍스트 총량 ≤80 단어/슬라이드 (ko 기준 160자)
  • 코드 ≤15줄, 초과 시 분할 + (이어서) 서브타이틀
  • 이미지 문법 정확히 준수할 것 — Marp 는 alt + dimension 을 space-separated로만 인식한다:
    • ![alt text](url) — alt 만
    • ![w:600](url) — dimension 만 (w:NUMBER, h:NUMBER — px 단위 없이 숫자만)
    • ![alt text w:600](url) — alt + dimension (dimension 은 항상 마지막, space-separated)
    • 금지: ![w:600 alt:"..."](url) — alt: prefix 는 Marp가 인식 못해 통째로 plain text 로 렌더됨 (과거 실전 사고)
    • 금지: ![width:600px ...](url) — width: 가 아니라 w:, 단위는 생략
  • data: URI 사용 금지 — Marp 는 보안 정책상 data:image/... URL 을 모든 형식(utf8,·base64,)에서 통째로 거부한다 (verified with marp-cli v4.3.1: ![x](data:image/svg+xml;base64,...) → <img> 태그 생성 안 됨, 원본 markdown 이 <p> 로 래핑되어 슬라이드에 raw text 노출). 인라인 다이어그램이 필요하면 SVG/PNG 를 slides_png/diag-NN.svg 같은 실제 파일로 저장하고 상대경로로 참조할 것:
    ![다이어그램 설명 w:720](slides_png/diag-01.svg)
    
    Marp 는 --allow-local-files 플래그(build-bundle.sh 에 이미 포함)로 로컬 파일 SVG 를 PNG 렌더 시 인라인화한다.

Read the full file on GitHub · 153 lines

Files

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.

Changes

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.

  1. 2mo ago First seen · 153 lines · 57 tokens per session scan A 85c9a82071a5

Subscribe to this mod's changes

slide-authoring is a skill published in the GitHub repository tobyilee/course-builder (27 stars, last pushed 6mo ago), licensed MIT. It adds 57 tokens to every session and 1,661 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 2026-08-30.

Related

slide-authoring compared with skills from other repositories

slide-authoring next to 6 skills from other repositories
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slide-authoringtobyilee/course-builderSkill276mo agoMITA57Claude Code
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eli5companion-inc/feynmanSkill10k7d agoMITA63Claude Code, Codex