book-writer: Skill for Claude Code

.claude/skills/cover-design/SKILL.md

cover-design is a skill for Claude Code from tobyilee/book-writer. It costs 78 tokens per session (1,229 once invoked), scanned A, original, MIT.

A workflow for creating book-cover images as 1600×2560 PNG files from a book's title, subject, mood, and audience. It also records a prompt that can be used to regenerate the cover.

In plain words
What is it for?
Use it to create, revise, or compare book-cover concepts for different audiences and subjects.
Why use it?
It turns a book concept into a defined cover direction and checks the resulting image's size, layout, and title readability.

Skill for Claude Code

Written for Claude Code: installed under .claude/.

This is tobyilee/book-writer's own configuration. It tells Claude Code how to work on book-writer 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 book-writer configures →

Reuse

Borrowing it

Nothing to install: this file belongs to tobyilee/book-writer. 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/book-writer/main/.claude/skills/cover-design/SKILL.md
Clone the repo
git clone --depth 1 https://github.com/tobyilee/book-writer

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 cover-design

README.md
[![agentmods](https://agentmods.dev/badge/skills/tobyilee/book-writer/cover-design/github.svg)](https://agentmods.dev/skills/tobyilee/book-writer/cover-design)
Your own site
<a href="https://agentmods.dev/skills/tobyilee/book-writer/cover-design"><img src="https://agentmods.dev/badge/skills/tobyilee/book-writer/cover-design/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 cover-design

Your own site · 80×15
<a href="https://agentmods.dev/skills/tobyilee/book-writer/cover-design"><img src="https://agentmods.dev/badge/skills/tobyilee/book-writer/cover-design.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 78 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,229 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. Third-party audits
  • NVIDIA SkillSpector pass 7 Sept 2026
How audits are shown
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 $0.00078 $0.01229
Opus 5 $0.00039 $0.00615
Sonnet 5 $0.00016 $0.00246
Haiku 4.5 $0.00008 $0.00123

Measured 9d ago against content hash 71d56cc7123a, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-09, from the pricing page.

Security

Grade A, and why

cover-design 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.

.claude/skills/cover-design/SKILL.md · 110 lines

How it starts

The opening of the file, as written. The whole thing — 110 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Cover Design

책의 표지 이미지를 설계·생성한다. 결과는 {slug}/cover.png (1600×2560 권장) + 재생성용 프롬프트 기록.

절차

  1. 입력 확인 — 책 제목, 부제(있으면), 주제 분위기, 대상 독자
  2. 콘셉트 3안 구상
    • A: 미니멀리즘 — 심볼 하나 + 큰 타이포
    • B: 일러스트형 — 주제 메타포 이미지
    • C: 타이포그래피 중심 — 제목 자체가 그래픽
  3. 추천안 선택 — 주제 톤·대상 독자에 가장 맞는 1안
  4. 프롬프트 작성 — 영어 프롬프트 권장 (이미지 모델 대부분 영어 최적화)
  5. 이미지 생성 — 사용 가능한 도구 순서로 시도
  6. 결과 검증 — 해상도, 구도, 제목 가독성 확인
  7. 저장cover.png + cover_prompt.md

콘셉트 선택 가이드

주제 톤 추천 콘셉트
차분한 기술서 A (미니멀리즘, 차분한 색조)
철학·에세이형 C (타이포그래피, 따뜻한 색)
실전 튜토리얼 B (일러스트, 선명한 색)
심화·이론서 A (미니멀, 깊이 있는 색)

프롬프트 작성 원칙

  • 스타일 지정: "minimalist book cover", "editorial illustration", "modernist typography"
  • 색상 톤: "warm muted palette", "deep blue and gold"
  • 분위기: "contemplative", "bold", "serene"
  • 구도: "title prominent in upper third, small author attribution at bottom"
  • 제외: "no cheesy stock photo aesthetic", "no generic tech gradient"
  • 해상도·비율: "portrait orientation, 1.6:1 aspect ratio"

예시 프롬프트:

A minimalist book cover in portrait format (1600x2560). 
Title "효과적인 SQL 쿼리 튜닝" in bold modern sans-serif 
occupying the top third. Center: a single abstract symbol 
resembling an interconnected graph in deep indigo. 
Background: warm off-white. Bottom-right: "Toby-AI" 
in small elegant serif. Editorial, calm, confident. 
No stock photography. No generic tech gradient.

이미지 생성 도구 우선순위

  1. 이미지 생성 MCP (설치되어 있으면) — 가장 선호
  2. 외부 API — OpenAI gpt-image-1, Stability SDXL 등 (사용자 API 키 필요)
  3. ImageMagick 폴백 — 단순 타이포그래피 플레이스홀더

ImageMagick 폴백 명령

convert -size 1600x2560 \
  -gradient '#1a1a2e-#2d1b4e' \
  -gravity center -font 'Apple-SD-Gothic-Neo' -pointsize 120 -fill white \
  -annotate +0-400 "{책 제목}" \
  -pointsize 70 -fill '#c9b8d8' -annotate +0+600 "{부제}" \
  -pointsize 50 -fill white -annotate +0+1000 "Toby-AI" \
  {slug}/cover.png

폰트가 없으면 -font Helvetica 또는 시스템 기본 폰트 사용.

검증 체크

  • 해상도 ≥ 1600×2560
  • 썸네일(200×320)로 축소해도 제목 읽힘
  • 저자 표기 존재 (기본값 Toby-AI, 사용자 지정 시 그 값 — 이미지 안 또는 메타데이터 예정)
  • 클리셰 회피 (기본 그라데이션, 스톡사진 느낌 없음)

Read the full file on GitHub · 110 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. 9d ago First seen · 110 lines · 78 tokens per session scan A 71d56cc7123a

Subscribe to this mod's changes

cover-design is a skill published in the GitHub repository tobyilee/book-writer (81 stars, last pushed 23d ago), licensed MIT. It adds 78 tokens to every session and 1,229 once invoked, about $0.0004 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 2026-08-30.

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