thumbnail-maker

thumbnail-maker is a skill for Claude Code from crealwork/ai-marketing-kit. It costs 115 tokens per session (1,640 once invoked), scanned A, original, MIT.

A process for creating sets of video thumbnails for YouTube videos, Shorts, and Reels in their standard sizes.

In plain words
What is it for?
Making long-form and vertical video covers with short hooks, visible stakes, subject cutouts, and multiple A/B-test candidates.
Why use it?
It produces competing variants for testing and checks the rendered text so incorrect words or symbols are not published.

Skill for Claude Code

Written for Claude Code: shipped in a Claude Code plugin.

Part of the ai-marketing-kit plugin — 26 skills shipped together

Install

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.

agentmods
npx agentmods add skills/crealwork/ai-marketing-kit/thumbnail-maker
Any agent
npx skills add crealwork/ai-marketing-kit --skill thumbnail-maker
Clone the repo
git clone --depth 1 https://github.com/crealwork/ai-marketing-kit

Made for: Claude Code.

Or install ai-marketing-kit, the plugin that ships this one along with the rest of its 26 skills.

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 thumbnail-maker

README.md
[![agentmods](https://agentmods.dev/badge/skills/crealwork/ai-marketing-kit/thumbnail-maker.svg)](https://agentmods.dev/skills/crealwork/ai-marketing-kit/thumbnail-maker)
Your own site
<a href="https://agentmods.dev/skills/crealwork/ai-marketing-kit/thumbnail-maker"><img src="https://agentmods.dev/badge/skills/crealwork/ai-marketing-kit/thumbnail-maker.svg" alt="Measured on agentmods" height="20"></a>
Per session 115 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,640 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00115 $0.01640
Opus 5 $0.00057 $0.00820
Sonnet 5 $0.00023 $0.00328
Haiku 4.5 $0.00012 $0.00164

Measured 6d ago against content hash a529274691ed, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-06, from the pricing page.

Security

Grade A, and why

thumbnail-maker 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 6d 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.

skills/thumbnail-maker/SKILL.md · 71 lines

How it starts

The opening of the file, as written. The whole thing — 71 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Thumbnail Maker

썸네일은 CTR 장치다 — 예쁜 이미지가 아니라 클릭 근거. 항상 변형 세트 (기본 4개) 로 뽑아 A/B 테스트에 넘긴다. 생성 정책은 image-gen 스킬과 동일: 모든 생성은 Higgsfield CLI 경유, 기본 모델 gpt_image_2 — 다른 경로로 말없이 전환 금지 (실패 = 보고).

Hard rules

  1. 1장 금지, 항상 4개+ 변형. 최소 3개는 같은 영상용 경쟁 후보 — YouTube "Test & compare"(썸네일 3개 A/B)에 바로 걸 수 있게.
  2. 문구 = 영상의 첫 주장(훅)과 일치. 어긋나면 이탈률로 돌아온다. ≤12자(KR) / 3–5단어(EN), 2줄 이내, 왼쪽 배치 (모바일 우하단은 재생시간 뱃지가 가린다). 숫자/스테이크 하나는 보이게 ($20, 99%). 낚시 금지.
  3. 문구까지 통생성이 기본 — 완성 썸네일(배경+인물+텍스트)을 gpt_image_2 원샷으로. 프롬프트는 줄 단위로 정확히: first line reads exactly "…" in <color>, second line reads exactly "…" + "render every character EXACTLY". 생성 후 글자 단위 READ 검증 필수 — 흔한 실패는 기호 누락 ("$20"→"0"). 오탈자 = 같은 모델로 재생성(문구를 짧게 단순화해도 됨), 인페인트 금지, 오탈자 배송 금지. HTML/PIL 오버레이는 통생성이 반복 실패할 때만 쓰는 최후 폴백 (유저 보고 후; 스크림은 하드 사각형 금지, 투명으로 빠지는 방향성 그라디언트만).
  4. 실제 얼굴 = 누끼 레퍼런스 통생성. 유저 제공 사진만 사용, 얼굴 지어내기 금지. 사진을 그대로 넣지 말고: rembg(birefnet-portrait) 누끼 → 박힌 자막/캡션 띠는 누끼 전에 제거(해당 영역 알파 0 → 알파 bbox 크롭) → 흰 배경에 콜라주한 한 장--image 레퍼런스로 주고 "preserve the EXACT faces"로 통생성. 2인 이상은 좌우 배치 한 장으로 합쳐 LEFT/RIGHT를 프롬프트에서 지명. 머리/옷을 바꿔야 하면 레퍼런스를 먼저 편집 (--image + "keep exact face, change ONLY the hair to …") 후 그걸로 생성. PIL로 누끼를 그라디언트 배경에 합성하는 방식은 금지 — 룩이 싸구려로 갈라진다.
  5. 변형 중 최소 1개는 타깃 채널의 실제 피드 문법. 생성 전에 그 채널(없으면 같은 장르 상위 채널) 썸네일 3–5개를 보고 문법을 추출 — 색/하이라이트 박스/ 말풍선/구도 — 그대로 카피한 변형을 만든다. 나머지는 드라마틱 high-CTR 계열 (네온, 과장 표정). 4장이 전부 같은 룩이면 A/B가 아니라 같은 카드 4장이다.
  6. 검증은 눈으로, 실제 노출 크기로: 각 변형을 168×94(유튜브 목록 크기)로 축소해 READ — 문구 읽히고 표정 보이면 합격. 얼굴은 레퍼런스 사진과 대조, 왜곡이면 재생성. 데스크톱 크기로만 보고 통과시키지 않는다.
  7. 셋업/명령/JSON 파싱/다운로드 스니펫은 image-gen 스킬 — higgsfield account status로 계정·크레딧 확인 후 생성.

규격

대상 크기 비고
YouTube 롱폼 1280×720 (16:9), <2MB --aspect_ratio 16:9로 생성 → 1280×720 리사이즈, 2MB 초과 시 JPEG q90. 업로드는 organic-social의 mediaItems[].thumbnail
Shorts/Reels 커버 1080×1920 (9:16) 첫 프레임 룰 우선 — 커버는 IG 그리드 1:1 센터 크롭 안전영역(y 420–1500) 고려
커뮤니티/배너 용도별 image-gen으로 라우팅

Read the full file on GitHub · 71 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. 6d ago First seen · 71 lines · 115 tokens per session scan A a529274691ed

Subscribe to this mod's changes

thumbnail-maker is a skill published in the GitHub repository crealwork/ai-marketing-kit (18 stars, last pushed 1mo ago), licensed MIT. It adds 115 tokens to every session and 1,640 once invoked, about $0.0006 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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