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 Dragoon0x/canon --skill canon-color-blindnessgit clone --depth 1 https://github.com/Dragoon0x/canonWrote 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/dragoon0x/canon/canon-color-blindness)<a href="https://agentmods.dev/skills/dragoon0x/canon/canon-color-blindness"><img src="https://agentmods.dev/badge/skills/dragoon0x/canon/canon-color-blindness/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/dragoon0x/canon/canon-color-blindness"><img src="https://agentmods.dev/badge/skills/dragoon0x/canon/canon-color-blindness.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 | $0.00087 | $0.00928 |
| Opus 5 | $0.00044 | $0.00464 |
| Sonnet 5 | $0.00017 | $0.00186 |
| Haiku 4.5 | $0.00009 | $0.00093 |
Grade A, and why
canon-color-blindness 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 — 79 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CANON · Color Blindness
8% of men and 0.5% of women have some form of color vision deficiency. Designing for them isn't a special case; it's designing for 1 in 12 of your users.
The cardinal rule
Color is never the only signal. Every piece of information conveyed by color must also be conveyed by text, shape, pattern, or position. WCAG 1.4.1.
| Bad (color only) | Good (color + secondary signal) |
|---|---|
| Red dot = error | Red dot + "Error" text label |
| Green line vs red line on chart | Solid line vs dashed line + legend |
| Green = online, gray = offline | Filled circle = online, empty ring = offline |
| Red border on invalid field | Red border + error icon + error message below |
Types of CVD
| Type | Prevalence (male) | Affects |
|---|---|---|
| Deuteranopia (green-blind) | ~5% | Red-green confusion |
| Protanopia (red-blind) | ~2.5% | Red-green confusion |
| Tritanopia (blue-blind) | ~0.01% | Blue-yellow confusion |
| Achromatopsia (total) | ~0.003% | No color perception |
Red-green is overwhelmingly the most common. Blue-yellow is rare. Designing for red-green covers the vast majority.
Safe palette strategies
- Avoid relying on red vs green as opposing signals. Use red vs blue, or add icons.
- Use lightness differences, not just hue. If two colors look the same in grayscale, they'll confuse someone with CVD.
- Sequential palettes (light-to-dark of one hue) work well because lightness varies.
- Categorical palettes: blue, orange, purple, brown, pink, gray — generally distinguishable across CVD types. Avoid red+green and blue+purple.
Charts specifically
- Different line styles (solid, dashed, dotted) in addition to colors.
- Different marker shapes (circle, square, triangle) on scatter plots.
- Direct labels over legend when possible (avoids the color-matching task entirely).
- Test palette in a CVD simulator (Sim Daltonism, Chrome DevTools).
Testing
- Chrome DevTools: Rendering tab → Emulate vision deficiency → Deuteranopia / Protanopia / Tritanopia.
- Sim Daltonism (macOS): real-time overlay.
- Coblis (online): upload screenshot, simulate CVD.
- Quick test: desaturate your UI to grayscale. If you can still distinguish all states, you pass.
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 · 79 lines · 87 tokens per session scan A c356871d4371
canon-color-blindness is a skill published in the GitHub repository Dragoon0x/canon (6 stars, last pushed 4mo ago), licensed MIT. It adds 87 tokens to every session and 928 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.
Other skills, from other repositories
accessibility
Accessibility (a11y) workflow skill. Use this skill when the user needs Audit and improve web accessibility following WCAG 2.1 guidelines. Use when asked to "improve accessibility", "a11y audit", "WCAG compliance", "screen reader support", "keyboard navigation", or "make accessible". Do NOT use for SEO (use seo)…
accessibility
Use when making a web UI conform to WCAG 2.2 Level AA — axe-core or Lighthouse a11y violations, keyboard operability, focus management, ARIA roles/names/live regions, contrast, tap-target size. NOT palette or visual intent (that is design), NOT test-runner setup (that is testing-web), NOT LCP/page-speed (that is…
accessibility-compliance-accessibility-audit-v2
Accessibility Audit and Testing workflow skill. Use this skill when the user needs You are an accessibility expert specializing in WCAG compliance, inclusive design, and assistive technology compatibility. Conduct audits, identify barriers, and provide remediation guidance and the operator should preserve the upstream…
accessibility-audit
Use when wCAG compliance audit — semantic HTML, ARIA, keyboard navigation, color contrast, and screen reader testing. Use when working with accessibility audit.
a11y-audit
Dedicated WCAG 2.2 AA/AAA accessibility audit across 10 dimensions (A1-A10) covering semantic HTML, keyboard navigation, ARIA patterns, color contrast, forms, images/media, responsive/zoom, motion/animation, reading/content, and legal compliance. Goes far beyond surface-level design-review checks with deep…
motion-video
Product animation, UI motion, portfolio videos — Apple-grade reveals, motion tokens, full production pipelines.