course-builder: Skill for Claude Code

.claude/skills/class-planning/SKILL.md

class-planning is a skill for Claude Code from tobyilee/course-builder. It costs 64 tokens per session (1,116 once invoked), scanned A, original, MIT.

A beat-sheet planner for one class lesson, dividing it into hook, teaching, example, practice, and recap sections. It coordinates what appears in slides, notes, and the spoken script.

In plain words
What is it for?
Planning lesson timing, key points, examples, visual suggestions, and speaker cues from a class specification.
Why use it?
It prevents different lesson materials from covering different content or using inconsistent timing. It also gives each part of the class a clear purpose.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

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/class-planning/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/tobyilee/course-builder

Made for: Claude Code.

Wrote this? Show the measurements

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agentmods badge for class-planning

README.md
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agentmods 80×15 button for class-planning

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Per session 64 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,116 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 $0.00064 $0.01116
Opus 5.5 $0.00026 $0.00446
Sonnet 5.5 $0.00013 $0.00223
Haiku 4.5 $0.00006 $0.00112

Measured 2mo ago against content hash aab601946f85, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

class-planning 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.

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/class-planning/SKILL.md · 103 lines

How it starts

The opening of the file, as written. The whole thing — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Class Planning — Beat Sheet Design

beat sheet는 slide/note/script 3저자의 공유 계획이다. 3명이 같은 내용을 다른 매체로 표현하기 때문에, beat가 모호하면 세 자산이 어긋난다.

5부 구조

Beat 목적 비중 (12분 class 기준)
hook 학습자 주의 포착, 왜 중요한지 45~90s
teach 핵심 개념 전달, 2~3 서브토픽 4~6min
example 구체 코드/사례로 추상을 구체화 2~4min
practice 미니 자가학습 (퀴즈와 별개) 30~90s
recap 핵심 3개 요약 30s

Duration이 8분 이하면 practice는 생략 가능. 15분 초과면 teach를 2~3 beat로 더 쪼갠다.

Beat 작성 필드

{
  "id": "b1",
  "type": "hook" | "teach" | "example" | "practice" | "recap",
  "duration_sec": 45,
  "key_points": ["핵심1","핵심2","핵심3"],
  "lo_ids": ["LO-1.1"],
  "examples": [{"lang":"js","snippet":"...","why":"..."}],
  "visual_hint": "대조 다이어그램" | "code highlight" | "flowchart" | null,
  "speaker_affect": "호기심" | "단호" | "친근" | "엄숙"
}

key_points 작성 원칙

  • 문장이 아니라 요점 (5~12 단어)
  • 각 key_point는 slide 1 bullet 또는 note 1 단락 또는 script 30~60s에 대응
  • 추상 개념만 나열하지 말고 1개 이상 구체 예시를 포함

Beat type별 가이드

hook

  • 학습자가 "이거 몰랐네" 느낄 문제 제시
  • 정답 노출 금지 (teach에서 해소)
  • 나쁜 예: "오늘은 RSC를 배우겠습니다"
  • 좋은 예: "이 페이지 로드가 왜 3초나 걸릴까요? 범인은 의외로..."

teach

  • 개념 정의 → 속성 2~3개 → 왜 중요 (3단 구조)
  • 서브토픽이 3개 이상이면 beat 분할

example

  • 실행 가능한 코드 또는 현실 사례
  • "왜 이 예시냐"를 why 필드에 명시 (저자들이 설명 재현할 때 참조)

practice

  • 사지선다가 아니라 open question
  • 답은 제공하지 않음 (다음 beat에서 간접적으로 제시)

recap

  • 정확히 3개 핵심 bullet
  • 다음 class의 teaser가 있으면 가산점

visual_hint (slide-author 힌트)

  • 추상 개념 → "비교 표" or "대조 다이어그램"
  • 프로세스 → "flowchart"
  • 코드 → "code highlight with arrow"
  • 수치·비율 → "bar chart"

speaker_affect (script-writer 힌트)

class의 tone 파라미터 위에서 beat별 세부 조정:

  • hook: 호기심, 약간 미스터리
  • teach: 차분, 명료
  • example: 흥분 섞인 설명
  • practice: 질문하는 톤, 침묵 허용
  • recap: 힘 실린 확신

Duration 검증

sum(beats.duration_sec) ∈ [target_sec × 0.9, target_sec × 1.1]

초과 시: 가장 긴 teach/example부터 압축. 부족 시: teach 확장.

LO 매핑 규칙

  • 모든 beat는 ≥1 LO 참조
  • LO 없는 beat는 잡담이므로 삭제
  • recap은 class의 모든 LO를 커버해야 함

재실행 규칙

  • beat id 재번호 금지
  • 구조 유지한 채 key_points만 교체 가능
  • duration 변경은 이웃 beat까지 재배분 필요 (class 총합 불변)

Read the full file on GitHub · 103 lines

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 · 103 lines · 64 tokens per session scan A aab601946f85

Subscribe to this mod's changes

class-planning is a skill published in the GitHub repository tobyilee/course-builder (27 stars, last pushed 6mo ago), licensed MIT. It adds 64 tokens to every session and 1,116 once invoked, about $0.0003 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.

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