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 5.5 | $0.00035 | $0.00371 |
| Sonnet 5.5 | $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 2mo 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.
- 2mo 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 6mo ago), licensed MIT. It adds 87 tokens to every session and 928 once invoked, about $0.0003 per session on Opus 5.5. 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.
canon-color-blindness compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| canon-color-blindnessDragoon0x/canon | Skill | 6 | 6mo ago | MIT | A | 87 | Claude Code, Codex |
| accessibilitydiegosouzapw/awesome-omni-skills | Skill | 170 | 4mo ago | MIT | C | 119 | Claude Code, Codex |
| accessibilityericrisco/rsc-harness | Skill | 503 | 2d ago | MIT | A | 86 | Claude Code, Codex |
| accessibility-auditoyi77/1ai-skills | Skill | 17 | yesterday | MIT | A | 29 | Claude Code |
| a11y-auditgreglas75/zuvo | Skill | 7 | 3d ago | MIT | A | 147 | Claude Code |
| axe-audittonone-ai/tonone | Skill | 77 | 23d ago | MIT | A | 47 | Claude Code |
| accessibility-compliance-accessibility-audit-v2diegosouzapw/awesome-omni-skills | Skill | 170 | 4mo ago | MIT | A | 76 | Claude Code |