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 apply-cross-hatching-techniquegit 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/apply-cross-hatching-technique)<a href="https://agentmods.dev/skills/jeffreytse/grimoire-core/apply-cross-hatching-technique"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/apply-cross-hatching-technique/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/apply-cross-hatching-technique"><img src="https://agentmods.dev/badge/skills/jeffreytse/grimoire-core/apply-cross-hatching-technique.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 | $0.00047 | $0.01309 |
| Opus 5 | $0.00023 | $0.00655 |
| Sonnet 5 | $0.00009 | $0.00262 |
| Haiku 4.5 | $0.00005 | $0.00131 |
Grade A, and why
apply-cross-hatching-technique 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 10d 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 — 81 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Apply Cross-Hatching Technique
Build convincing tonal gradients and surface texture in ink or pencil drawings by systematically controlling line angle, spacing, and layering direction to create form through cross-hatching.
Why This Is Best Practice
Why best: Cross-hatching produces controllable, reproducible tonal gradation and volume using only line direction, spacing, and layering — no blending tools or materials required, and it scales cleanly from small illustrations to large technical plates. Adopted by: Cross-hatching is the standard tonal technique in technical illustration, architectural drawing, comic art (Leyendecker, Breccia, Mignola), engraving (Dürer), and medical illustration. The Society of Illustrators and GNSI (Guild of Natural Science Illustrators) both list cross-hatching as a core technical skill. Architectural sketching standards (from Ching's "Architectural Graphics") rely on cross-hatching for presenting materials and shadow in hand drawings. Impact: Dürer's woodcuts demonstrate that systematic cross-hatching creates convincing volume and texture indistinguishable from painting at distance — achieved entirely through line direction and density control. Random or inconsistent hatching produces visual noise rather than form. Controlled cross-hatching is faster than stippling for equivalent tonal coverage and more scalable for reproduction than smooth graphite gradients.
Steps
1. Understand the four hatching types
Master each in isolation before combining:
- Hatching (parallel lines): lines in one direction; spacing controls value (close = dark, far = light)
- Cross-hatching (two directions): second set of lines at 60–90° to the first; produces darker values
- Contour hatching: lines follow the surface form (curved lines on a sphere, cylindrical lines on a column); adds structural information
- Scumbling/circular hatching: small overlapping ovals; produces soft texture; useful for rough surfaces
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.
- 10d ago First seen · 81 lines · 47 tokens per session scan A caaeee4ec9fb
apply-cross-hatching-technique is a skill published in the GitHub repository jeffreytse/grimoire-core (4 stars, last pushed 21d ago), licensed MIT. It adds 47 tokens to every session and 1,309 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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