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 jeffreytse/grimoire-core --skill design-sketchbook-practicegit clone --depth 1 https://github.com/jeffreytse/grimoire-coreWrote 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/jeffreytse/grimoire-core/design-sketchbook-practice)<a href="https://agentmods.dev/skills/jeffreytse/grimoire-core/design-sketchbook-practice"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/design-sketchbook-practice/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/jeffreytse/grimoire-core/design-sketchbook-practice"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/design-sketchbook-practice.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 | $0.00042 | $0.01282 |
| Opus 5 | $0.00021 | $0.00641 |
| Sonnet 5 | $0.00008 | $0.00256 |
| Haiku 4.5 | $0.00004 | $0.00128 |
Grade A, and why
design-sketchbook-practice 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 12d 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 — 93 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Design Sketchbook Practice
Build a structured sketchbook practice by defining session types, rotating skill focus areas, establishing daily warm-ups, and reviewing progress systematically to develop drawing ability faster than unguided practice.
Why This Is Best Practice
Why best: Deliberate, rotated practice targeting specific sub-skills produces measurably faster skill gain than unstructured sketching, because it keeps the artist working at the edge of current ability instead of reinforcing existing habits. Adopted by: The Watts Atelier, New Masters Academy, and most structured art education programs prescribe deliberate practice frameworks for sketchbook use. Nicolaïdes' "The Natural Way to Draw" — still taught at leading art schools — structures a full-year curriculum entirely around systematic sketchbook exercises. Concept design studios (Epic Games, Riot, Disney) expect prospective hires to demonstrate consistent sketchbook practice in their portfolios. Impact: Ericsson's deliberate practice research (1993, Psychological Review) shows that unstructured repetition produces minimal skill gain — improvement requires focused practice on specific sub-skills just beyond current ability. Applied to drawing: an artist who spends 100 hours on gesture vs one who spends 10 hours on gesture, 10 on perspective, 10 on value, etc. — the latter develops broader capability significantly faster. A structured rotation ensures no foundational skill is neglected.
Steps
1. Audit your current drawing level by sub-skill
Before designing the practice, assess each core skill area:
- Gesture / line confidence: can you capture pose in 30-second sketches?
- Proportion: accurate relative sizing across the figure, face, objects?
- Perspective: 1-point, 2-point, 3-point understanding?
- Value / shading: range from light to dark, edge control?
- Anatomy: structural understanding of figure, face, hands?
- Observation: can you accurately transcribe what you see?
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.
- 12d ago First seen · 93 lines · 42 tokens per session scan A 8080aa3cd238
design-sketchbook-practice is a skill published in the GitHub repository jeffreytse/grimoire-core (4 stars, last pushed 24d ago), licensed MIT. It adds 42 tokens to every session and 1,282 once invoked, about $0.0002 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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