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 0xDarkMatter/claude-mods --skill color-opsgit clone --depth 1 https://github.com/0xDarkMatter/claude-modsWrote 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/0xdarkmatter/claude-mods/color-ops)<a href="https://agentmods.dev/skills/0xdarkmatter/claude-mods/color-ops"><img src="https://agentmods.dev/badge/skills/0xdarkmatter/claude-mods/color-ops/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/0xdarkmatter/claude-mods/color-ops"><img src="https://agentmods.dev/badge/skills/0xdarkmatter/claude-mods/color-ops.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00070 | $0.04187 |
| Opus 5 | $0.00035 | $0.02093 |
| Sonnet 5 | $0.00014 | $0.00837 |
| Haiku 4.5 | $0.00007 | $0.00419 |
Grade A, and why
color-ops 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 9d 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 — 375 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Color Operations
Practical color knowledge for developers and designers. Covers color spaces, accessibility, palette generation, CSS implementation, and design token architecture.
Inspired by meodai/skill.color-expert - a comprehensive 286K-word color science knowledge base with 113 reference files. This is a lightweight operational skill for everyday frontend and design work. For deep color science (spectral mixing, historical color theory, CAM16, pigment physics), install the full skill.
Color Space Decision Table
Pick the right space for the task. This is the single most impactful color decision you'll make.
| Task | Use | Why |
|---|---|---|
| Perceptual color manipulation | OKLCH | Best uniformity for lightness, chroma, hue |
| CSS gradients & palettes | OKLCH or color-mix(in oklab) |
No mid-gradient grey/brown deadzone |
| Gamut-aware color picking | OKHSL / OKHSV | Cylindrical like HSL but perceptually grounded |
| Normalized saturation (0-100%) | HSLuv | CIELUV chroma normalized per hue/lightness |
| Print workflows | CIELAB D50 | ICC standard illuminant |
| Screen workflows | OKLAB | D65 standard, perceptually uniform |
| Color difference (precision) | CIEDE2000 | Gold standard perceptual distance metric |
| Color difference (fast) | Euclidean in OKLAB | Good enough for most applications |
| Quick prototyping | HSL | Simple, fast, every tool supports it |
Why HSL Falls Short
HSL is fine for quick prototyping. It fails for anything perceptual:
- Lightness is a lie:
hsl(60,100%,50%)(yellow) andhsl(240,100%,50%)(blue) have the same L=50% but vastly different perceived brightness - Hue is non-uniform: 20 degrees near red is a dramatic shift; 20 degrees near green is barely visible
- Saturation doesn't correlate: S=100% dark blue still looks muted
Rule of thumb: Use HSL for throwaway work. Use OKLCH for anything that ships.
Key Distinctions
What ships with it
7 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.
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.
- 9d ago First seen · 375 lines · 70 tokens per session scan A e8196eb83f35
color-ops is a skill published in the GitHub repository 0xDarkMatter/claude-mods (34 stars, last pushed 17d ago), licensed MIT. It adds 70 tokens to every session and 4,187 once invoked, about $0.0003 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 2026-08-30.
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