Generate Youtube Thumbnail
krusemediallc/arcads-claude-code
Generate high-CTR YouTube thumbnails using Nano Banana 2 via the Arcads external API.
A skill your agent uses when コレクションの YouTube サムネイル（thumbnail.jpg）を CTR 最適化し、実効 textrender.mode に従い、既定 aiburnin で文字入り候補を生成・承認してから textless 背景を作るとき、または deterministic で textless main.png/jpg…
Install Thumbnail
$ npx skills add daiki-beppu/youtube-automation --skill thumbnail -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install daiki-beppu/youtube-automation thumbnail --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/daiki-beppu/youtube-automation.git skills-src && mkdir -p .claude/skills && cp -r skills-src/.claude/skills/thumbnail .claude/skills/thumbnail && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "thumbnail" agent skill from https://github.com/daiki-beppu/youtube-automation/tree/main/.claude/skills/thumbnail into .claude/skills/thumbnail/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "thumbnail", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/daiki-beppu/youtube-automation/tree/main/.claude/skills/thumbnailType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add daiki-beppu/youtube-automation --skill thumbnail -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install daiki-beppu/youtube-automation thumbnail --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/daiki-beppu/youtube-automation.git skills-src && mkdir -p .agents/skills && cp -r skills-src/.claude/skills/thumbnail .agents/skills/thumbnail && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "thumbnail" agent skill from https://github.com/daiki-beppu/youtube-automation/tree/main/.claude/skills/thumbnail into .agents/skills/thumbnail/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "thumbnail", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add daiki-beppu/youtube-automation --skill thumbnail -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install daiki-beppu/youtube-automation thumbnail --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/daiki-beppu/youtube-automation.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/.claude/skills/thumbnail .cursor/skills/thumbnail && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "thumbnail" agent skill from https://github.com/daiki-beppu/youtube-automation/tree/main/.claude/skills/thumbnail into .cursor/skills/thumbnail/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "thumbnail", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/daiki-beppu/youtube-automation.git --path .claude/skills/thumbnail--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add daiki-beppu/youtube-automation --skill thumbnail -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install daiki-beppu/youtube-automation thumbnail --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/daiki-beppu/youtube-automation.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/.claude/skills/thumbnail .gemini/skills/thumbnail && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "thumbnail" agent skill from https://github.com/daiki-beppu/youtube-automation/tree/main/.claude/skills/thumbnail into .gemini/skills/thumbnail/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "thumbnail", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install daiki-beppu/youtube-automation thumbnailInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add daiki-beppu/youtube-automation --skill thumbnail -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/daiki-beppu/youtube-automation.git skills-src && mkdir -p .github/skills && cp -r skills-src/.claude/skills/thumbnail .github/skills/thumbnail && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "thumbnail" agent skill from https://github.com/daiki-beppu/youtube-automation/tree/main/.claude/skills/thumbnail into .github/skills/thumbnail/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "thumbnail", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add daiki-beppu/youtube-automation --skill thumbnail -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install daiki-beppu/youtube-automation thumbnail --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/daiki-beppu/youtube-automation.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/.claude/skills/thumbnail .opencode/skills/thumbnail && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "thumbnail" agent skill from https://github.com/daiki-beppu/youtube-automation/tree/main/.claude/skills/thumbnail into .opencode/skills/thumbnail/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "thumbnail", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
thumbnail- GitHub stars
- 169
- Token cost
- ~11k tokens
- SKILL.md length
- 2,760 words
- Files
- 28 (incl. references)
- Skills in repo
- 21
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
A skill your agent uses when コレクションの YouTube サムネイル（thumbnail.jpg）を CTR 最適化し、実効 textrender.mode に従い、既定 aiburnin で文字入り候補を生成・承認してから textless 背景を作るとき、または deterministic で textless main.png/jpg…
- Works in 3 steps: 既存参照の選択（新規生成しない） → テキストオーバーレイ（thumbnail.jpg） → 承認済み thumbnail から textless main を再生成
- Tasks that involve A/B testing
- SKILL.md covers 前後工程, 成果物, Overview and チャンネル制約入力（非停止）, plus 18 more sections
- Runs Python and Shell scripts from its folder; calls uv, bash and codex; needs OPENAI_API_KEY
What it does
Thumbnail is an agent skill from daiki-beppu/youtube-automation. Use when コレクションの YouTube サムネイル（thumbnail.jpg）を CTR 最適化し、実効 textrender.mode に従い、既定 aiburnin で文字入り候補を生成・承認してから textless 背景を作るとき、または deterministic で textless main.png/jpg を先行生成して実フォント合成するとき、--compare で生成済み候補を競合と 320px 比較するとき、--test で Studio の A/B テストを設計・記録するとき、--iterate で伸びた動画の勝因を次のサムネへ還元するとき、または --loop で textless main.png/jpg から Veo / fal.ai / Gemini Omni Flash のループ動画背景を生成するとき。「サムネイル生成」「画像生成」「アイキャッチ」「サムネ比較」「モバイル表示テスト」「サムネ A/B テスト」「Test & Compare」「伸びた動画のサムネ改善」「ループ動画」「Hailuo」「背景動画」「loop.mp4」で発動。競合の勝ちパターン分析は…
Its SKILL.md is about 11k tokens, which your agent loads only when the skill is triggered. The skill folder holds 28 other files, including reference files (for example `config.default.yaml`, `references/archive-approved-thumbnail.py` and `references/channel-adaptation.md`).
It sits in Media & Creative, covering A/B testing and AI video generation. It works with YouTube and fal. The repository describes itself as: YouTube チャンネル自動化 共有コア.
When your agent uses it
- Tasks that involve A/B testing
- Tasks that involve AI video generation
Example prompts
- “/thumbnail”
Requirements
- Python 3
- A Bash shell
- A credential in OPENAI_API_KEY
Workflow steps
3 steps, taken from the step headings in SKILL.md.
- 既存参照の選択（新規生成しない）
- テキストオーバーレイ（thumbnail.jpg）
- 承認済み thumbnail から textless main を再生成
What it can do on your machine
Read from SKILL.md and the folder at commit 4725876. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
Ships script files (Python and Shell, from the files we listed), which the agent can run.
Shell commands in SKILL.md call:
uvbashcodexjq
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md. Its commands use uv, which can reach the network depending on how they are called.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names these keys or tokens, usually read from environment variables:
OPENAI_API_KEY
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Thumbnail loads about 11k tokens when it runs, and up to ~49k if it reads all its reference files. Until then it costs about 152 tokens; SKILL.md has 2,760 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 2,760 words (~10,874 tokens).
“コレクション用サムネイルを config/skills/thumbnail.yaml（skill-config）に基づいて生成する。 チャンネルごとにスタイル・キャラ・参照画像が異なり、すべて skill-config から動的に読み取る。 画像生成プロバイダー（Gemini / OpenAI / codex）は image_generation.provider で切り替え可能。手動候補選択の共通契約は operator guide に従う。”
- name
- thumbnail
- purpose
- 作る
Files
SKILL.md and 27 other files (references) in .claude/skills/thumbnail of daiki-beppu/youtube-automation.
- SKILL.md
- config.default.yaml
- references/archive-approved-thumbnail.py
- references/channel-adaptation.md
- references/codex-image-batch.sh
- references/codex-image.sh
- references/codex-prompt.py
- references/compare.md
- references/compare_thumbnails.py
- references/finalize_planning_preview.py
- references/generate_image.py
- references/generate_loop_video.py
- references/generation-workflows.md
- references/history-schema.md
- references/iterate.md
- references/loop.md
- references/operator-guide.md
- references/prompt-schema.md
- references/prompting.md
- references/provider-guidance.md
- … and 8 more
Open the folder on GitHubat commit 4725876
Compare with similar skills
Thumbnail next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Thumbnail this skilldaiki-beppu/youtube-automation | 169 | — | ~11k | Automated safety check: Pass | Custom licence | |
| Generate Youtube Thumbnailkrusemediallc/arcads-claude-code | 1.6k | — | ~2.4k | Automated safety check: Notes | MIT | |
| Video-to-Sprite Animation Generator0x0funky/agent-sprite-forge | 4.3k | — | ~3.8k | Automated safety check: Pass | MIT | |
| Character Design with genmediafal-ai-community/skills | 249 | — | ~1.3k | Automated safety check: Pass | None | |
| Seedance Faceless Channelrediumvex/ai-video-generator-claude | 406 | — | ~4.4k | Automated safety check: Pass | MIT | |
| AI Marketing VideosNeverSight/learn-skills.dev | 216 | 3 repos | ~2.1k | Automated safety check: Pass | None |
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Categories
Questions about Thumbnail
What does Thumbnail do?
A skill your agent uses when コレクションの YouTube サムネイル（thumbnail.jpg）を CTR 最適化し、実効 textrender.mode に従い、既定 aiburnin で文字入り候補を生成・承認してから textless 背景を作るとき、または deterministic で textless main.png/jpg…. Thumbnail is an agent skill from daiki-beppu/youtube-automation.
When should I use Thumbnail?
Thumbnail fits situations like: tasks that involve A/B testing; tasks that involve AI video generation.
How do I install Thumbnail in Claude Code?
Run `npx skills add daiki-beppu/youtube-automation --skill thumbnail -a claude-code`. Or copy the skill folder (.claude/skills/thumbnail in daiki-beppu/youtube-automation) into .claude/skills/thumbnail in your project. Claude Code loads it when a task matches its description.
How do I install Thumbnail in Codex?
Run `npx skills add daiki-beppu/youtube-automation --skill thumbnail -a codex`. Or copy the skill folder (.claude/skills/thumbnail in daiki-beppu/youtube-automation) into .agents/skills/thumbnail in your project. Codex loads it when a task matches its description.
Can I use Thumbnail in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add daiki-beppu/youtube-automation --skill thumbnail -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/thumbnail, .gemini/skills/thumbnail, .github/skills/thumbnail and .opencode/skills/thumbnail in your project.
What does Thumbnail need to run?
Going by SKILL.md and its folder, Thumbnail needs Python and a shell for the scripts in its folder, the command-line tools its instructions call (uv, bash, codex and jq) and credentials named OPENAI_API_KEY. Our summary lists: Python 3; A Bash shell; A credential in OPENAI_API_KEY.
Does Thumbnail access the network?
SKILL.md contains no URLs. Its commands use uv, which can reach the network depending on how they are called. This is read from the text; nothing was executed.
Is Thumbnail safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Thumbnail use?
Thumbnail has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Thumbnail use?
About 11k tokens (SKILL.md is roughly 43k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 38k tokens, read only when the agent opens those files.
What are the alternatives to Thumbnail?
Skills that share tags, products or a category with Thumbnail: Generate Youtube Thumbnail (krusemediallc/arcads-claude-code, 1.6k stars), Video-to-Sprite Animation Generator (0x0funky/agent-sprite-forge, 4.3k stars), Character Design with genmedia (fal-ai-community/skills, 249 stars) and Seedance Faceless Channel (rediumvex/ai-video-generator-claude, 406 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Thumbnail?
daiki-beppu (a GitHub user) maintains it in daiki-beppu/youtube-automation, which has 169 GitHub stars. The repository holds 21 skills in this directory. The repository was last updated on October 7, 2026.
Source: daiki-beppu/youtube-automation on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.