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 CathyErer/frog-and-toad-studio --skill frog-and-toad-illustration-stylegit clone --depth 1 https://github.com/CathyErer/frog-and-toad-studioWrote 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/cathyerer/frog-and-toad-studio/frog-and-toad-illustration-style)<a href="https://agentmods.dev/skills/cathyerer/frog-and-toad-studio/frog-and-toad-illustration-style"><img src="https://agentmods.dev/badge/skills/cathyerer/frog-and-toad-studio/frog-and-toad-illustration-style/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/cathyerer/frog-and-toad-studio/frog-and-toad-illustration-style"><img src="https://agentmods.dev/badge/skills/cathyerer/frog-and-toad-studio/frog-and-toad-illustration-style.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 | $0.00077 | $0.01525 |
| Opus 5 | $0.00039 | $0.00763 |
| Sonnet 5 | $0.00015 | $0.00305 |
| Haiku 4.5 | $0.00008 | $0.00153 |
Grade A, and why
frog-and-toad-illustration-style 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 11d 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 — 129 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Frog and Toad Illustration Style
Bundled Prompt Library
prompts/ ships ready-made prompt lists for all 20 chapters, named in teaching order:
01-tomorrow.md … 05-alone.md (Days with Frog and Toad), 06-down-the-hill.md … 10-christmas-eve.md (All Year), 11-a-list.md … 15-the-dream.md (Together), 16-spring.md … 20-the-letter.md (Are Friends).
When the user asks for a chapter's illustrations without supplying their own prompt file, use the matching bundled file as the source prompt list. A user-supplied *画图.md file always takes priority over the bundled copy.
Generating images requires the agent to have an image-generation capability (built-in tool, MCP image server, or API). If none is available, tell the user instead of silently skipping.
Core Style
Use the built-in image generation workflow by default. Generate raster PNG illustrations, not SVGs.
Apply this style base to every prompt unless the user explicitly changes it:
Square 1:1 children's storybook illustration. Clean white background with lots of empty space. Hand-drawn slightly wobbly black outlines filled with soft warm watercolor colors: olive green, warm brown, tan, cream, soft orange. Simple, uncluttered, friendly, gentle. No text, no words, no labels.
Keep the drawings classroom-friendly: readable action, clear facial expression, minimal props, and generous white space.
Character Model
Keep the two characters visually consistent:
FROG: a tall slim green frog with a friendly face, wearing a green jacket and white-and-green striped trousers.
TOAD: a short plump brown toad with a round belly and big expressive eyes, wearing a brown-and-tan suit jacket and trousers.
Use Frog for problem-pointing scenes unless the prompt says otherwise. Use Toad for solution-action scenes and emotion cards unless the prompt says otherwise.
Workflow
- Read the user's source prompt file completely.
- Identify each requested image slot, usually headings like
A1,B5, orC3. - Preserve the user's scene intent and action verb. Normalize each prompt into a structured image-generation prompt that includes:
- use case:
illustration-story - asset type: square storybook courseware illustration, workbook icon, or reusable emotion card
- primary request and scene
- subject, style, composition, palette, constraints, and avoid list
- use case:
- Generate one image per slot. Do not combine distinct slots into one generation request.
- Save finished images into the relevant chapter folder under
illustrations/. - Name files consistently:
What ships with it
21 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
- agents/openai.yaml 287 B
- prompts/01-tomorrow.md 9.3 KB
- prompts/02-the-kite.md 3.9 KB
- prompts/03-shivers.md 5.3 KB
- prompts/04-the-hat.md 7.9 KB
- prompts/05-alone.md 7.2 KB
- prompts/06-down-the-hill.md 6.1 KB
- prompts/07-the-corner.md 7.6 KB
- prompts/08-ice-cream.md 6.4 KB
- prompts/09-the-surprise.md 5.0 KB
- prompts/10-christmas-eve.md 5.4 KB
- prompts/11-a-list.md 4.9 KB
- prompts/12-the-garden.md 9.7 KB
- prompts/13-cookies.md 6.8 KB
- prompts/14-dragons-and-giants.md 8.1 KB
- prompts/15-the-dream.md 5.5 KB
- prompts/16-spring.md 6.7 KB
- prompts/17-the-story.md 6.9 KB
- prompts/18-a-lost-button.md 7.4 KB
- prompts/19-a-swim.md 7.2 KB
- prompts/20-the-letter.md 6.4 KB
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.
- 11d ago First seen · 129 lines · 77 tokens per session scan A dab3747e64c2
frog-and-toad-illustration-style is a skill published in the GitHub repository CathyErer/frog-and-toad-studio (11 stars, last pushed 1mo ago), licensed MIT. It adds 77 tokens to every session and 1,525 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 2026-08-31.
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