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.
npx skills add Ckokoski/AuthorAgent --skill cover-designergit clone --depth 1 https://github.com/Ckokoski/AuthorAgentWrote 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.
[](https://agentmods.dev/skills/ckokoski/authoragent/cover-designer)<a href="https://agentmods.dev/skills/ckokoski/authoragent/cover-designer"><img src="https://agentmods.dev/badge/skills/ckokoski/authoragent/cover-designer/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.
<a href="https://agentmods.dev/skills/ckokoski/authoragent/cover-designer"><img src="https://agentmods.dev/badge/skills/ckokoski/authoragent/cover-designer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00024 | $0.01213 |
| Opus 5 | $0.00012 | $0.00607 |
| Sonnet 5 | $0.00005 | $0.00243 |
| Haiku 4.5 | $0.00002 | $0.00121 |
Grade A, and why
cover-designer 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.
How it starts
The opening of the file, as written. The whole thing — 113 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Cover Designer
Generate a coordinated set of book covers in the standard sizes an author needs to ship across every retail platform — all from one visual brief, so the ebook, print, audiobook, and social-banner versions look cohesive.
Sizes produced
| Variant | Dimensions | What it's for |
|---|---|---|
| Ebook | 1024×1536 (2:3) | Amazon Kindle / KDP listings, BookBub thumbnails, Goodreads |
| 1024×1536 (2:3) | Front cover for paperback / hardcover (6×9 trim). Spine + back wrap added separately in your designer. | |
| Audiobook | 1024×1024 (1:1) | ACX / Findaway / Spotify. Upscale to 2400×2400 before submitting. |
| Social | 1536×1024 (3:2) | Twitter / X cards, Facebook OG, BookBub feature graphics, newsletter headers |
How the AI brief works
Every cover gets the same set of fields, but the AI lays out for the target aspect (vertical for ebook/print, square for audiobook, landscape for social).
Required:
title— the book titleauthor— pen name (auto-pulled from linked persona if available)genre— primary genre (romance / fantasy / sci-fi / thriller / mystery / horror / literary / YA / nonfiction / memoir / children)description— what the book is about (the AI captures the feeling, not the literal scene)
Optional richness (use as many as fit your project):
subgenre— e.g., "dark academia", "cosy mystery", "epic fantasy"mood— e.g., "tense, claustrophobic", "warm, hopeful"era— e.g., "1920s Vienna", "near-future", "Regency"setting— e.g., "ancient library at midnight", "remote Scottish cottage"keyImagery— array of visual elements you want featured (e.g.,["a burning compass", "raven feathers"])palette— color direction (e.g., "deep blue and gold", "blood red on charcoal")avoidImagery— what to keep OUT (e.g., "no faces, no weapons, no skulls")style—realistic|illustrated|minimalist(default: illustrated)
Provider preference
By default uses OpenAI's gpt-image-1 (best for book covers per author
testing). Falls back to Together AI Flux if no OpenAI key is configured.
Override with provider: 'together' | 'openai' | 'auto'.
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.
- 9d ago First seen · 113 lines · 24 tokens per session scan A 5a0b0e78dc94
cover-designer is a skill published in the GitHub repository Ckokoski/AuthorAgent (105 stars, last pushed 1mo ago), licensed MIT. It adds 24 tokens to every session and 1,213 once invoked, about $0.0001 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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