Oklch Skill

Community

jakubkrehel

oklch-skill

OKLCH color space for web projects. Convert hex/rgb/hsl to oklch, generate palettes, check contrast, handle gamut boundaries, and theme with Tailwind v4. Triggers on oklch, color conversion, palette generation, contrast ratio, gamut, display p3, design tokens, hue drift, chroma, dark mode colors.

Overview

Publisher	jakubkrehel
Repository	`oklch-skill`
Skill name	`oklch-skill`
Stars	269
Forks	10
Bundled files	4
License	MIT
Links	Skill source Repository

Markdown instructions
A SKILL.md file the model loads on demand, so it only costs tokens when a request actually matches.
Works with any LLM
AI skills are plain Markdown, not provider-specific code, so this works with GPT, Claude, Gemini, Grok, or a local model.
4 bundled files
Scripts, templates, and references the model can read while it works. Files are read-only and never executed.
Open source
Published by jakubkrehel on GitHub. Read the source before you install it.

Installation

Install the Oklch Skill AI skill in TypingMind to use it with any LLM, or drop it into another agent that reads SKILL.md.

Install in TypingMind

TypingMind installs a skill straight from its GitHub folder — it reads SKILL.md, bundles the resource files, and stores the result locally.

Open the app and go to Plugins → Skills.
Choose "Install from GitHub".
Paste the skill folder URL below and confirm.
https://github.com/jakubkrehel/oklch-skill/tree/main/skills/oklch-skill
Enable the skill in any chat where you want it available.

Plugins → Skills → Add skill → From GitHub URL, then paste the folder URL and press Continue.

Install in another agent

Any agent that reads the Agent Skills format can use this skill — copy the folder into that agent's skills directory.

Claude Code — .claude/skills

git clone --depth 1 https://github.com/jakubkrehel/oklch-skill.git /tmp/oklch-skill
mkdir -p .claude/skills
cp -r /tmp/oklch-skill/skills/oklch-skill .claude/skills/oklch-skill

Restart Claude Code after copying so it picks up the new skill.

Use it in TypingMind

Enable Oklch Skill in any TypingMind chat and the model takes it from there. Its name and description sit in the system prompt, and the moment a request matches, the model loads the full instructions itself — you never invoke it by hand, and it costs no tokens until it is actually used.

The model loads Oklch Skill on its own as soon as a request matches it.

Works with any AI model

AI skills are plain Markdown instructions rather than provider-specific code, so Oklch Skill is not tied to the model it was written for. Install it once in TypingMind and use it with GPT-5, Claude, Gemini, Grok, DeepSeek, Mistral, Llama, or a local model you run yourself — all on your own API keys.

Loaded only when it is needed
The system prompt carries just the name and description. The instructions are fetched on the first matching request, so an idle skill costs nothing.
Switch models mid-chat
Because the skill is instructions rather than code, changing model does not break it — the next model reads the same SKILL.md.

Skill instructions

This is the SKILL.md content the model loads. Read it before installing — a skill is instructions your model will follow.

OKLCH Colors

OKLCH is a perceptually uniform color space where the numbers actually mean what you think they mean. Most color problems in CSS — broken palettes, failing contrast, hue drift — come from using color spaces that don't match how we see. OKLCH fixes the model so the tools work. To explore interactively, visit oklch.fyi.

Quick Reference

Category	When to use	Reference
Conversion	Hex/rgb/hsl to oklch	color-conversion.md
Palettes	Generate scales, multi-hue, dark mode	palette-generation.md
Contrast	APCA/WCAG checks, fixing failing contrast	accessibility-contrast.md
Gamut & Tailwind	P3 fallbacks, `@theme` scales, gamut clamping	gamut-and-tailwind.md

Why OKLCH

Perceptual uniformity. Equal L steps = equal brightness. oklch(0.5 ...) is visually mid. HSL's lightness: 50% varies wildly by hue.
Stable hue. HSL blue shifts toward purple as lightness changes. OKLCH hue stays constant across the full lightness range.
Independent chroma. Chroma is an absolute measure of colorfulness that doesn't depend on lightness. HSL saturation does.
Finite gamut. Not every oklch value maps to a displayable sRGB color. High-chroma values at certain hues will clip — gamut awareness is required.

OKLCH Syntax


oklch(L C H)
oklch(L C H / alpha)

Channel	Range	Description
L (Lightness)	0–1	0 = black, 1 = white. Perceptually uniform.
C (Chroma)	0–~0.4	Colorfulness. 0 = gray. Max depends on L and H.
H (Hue)	0–360	Hue angle in degrees.
alpha	0–1	Optional transparency. Slash syntax.

css
oklch(0.637 0.237 25.331)
oklch(0.8 0.05 200 / 0.5)

Formatting: L and C use 3 decimal places, H uses up to 3. Drop trailing zeros. Format -0 as 0. Browser support: Baseline 2023, 96%+ global coverage.

Key Thresholds

Rule	Value
Light/dark boundary	L > 0.6 = light background → use dark text
Lightness gap (light bg)	Foreground L < 0.45 when background L > 0.85
Lightness gap (dark bg)	Foreground L > 0.75 when background L < 0.25
Hue drift threshold	> 10° spread across palette steps = visible drift
APCA normal text	\|Lc\| >= 60 to pass, >= 75 for pass+
WCAG 2 normal text	4.5:1 AA, 7:1 AAA
Contrast fix	Adjust L only — chroma has negligible effect

Review Output Format

Always present color changes as a markdown table with Before and After columns. Include every color that was changed — not just a subset. Never list findings as separate "Before:" / "After:" lines outside of a table.

Before	After
`color: #3b82f6`	`color: oklch(0.623 0.188 259.815)`
Same absolute C across hues	Same C% of each hue's max chroma
No sRGB fallback for P3 color	`@media (color-gamut: p3)` wrapper

This keeps feedback scannable and diff-friendly. Each row is a self-contained change the developer can act on independently.

Common Mistakes

Issue	Fix
Hex/rgb/hsl color in new code	Convert to `oklch()`
HSL palette ramp with hue drift	Rebuild with constant oklch hue
Failing contrast (check foreground vs its background using APCA)	Adjust oklch L channel, keep C and H
High chroma without gamut check	Clamp to max chroma for the L/H in sRGB
Same absolute C across different hues	Use same C% (percentage of max) for consistent vividness
P3 color without sRGB fallback	Add `@media (color-gamut: p3)` pattern
Dark mode with hand-picked colors	Derive from light palette by reversing L mapping
Hex in Tailwind v4 `@theme`	Convert to oklch values
Alpha with comma syntax	Use slash: `oklch(L C H / alpha)`

Reference Files

color-conversion.md — Supported formats, conversion examples, bulk conversion rules, what to leave alone
palette-generation.md — Scale convention, generation algorithm, multi-hue palettes, dark mode, why not HSL
accessibility-contrast.md — APCA and WCAG 2 thresholds, fixing contrast with L, lightness gap guide, hue drift detection
gamut-and-tailwind.md — sRGB vs P3, gamut clamping, CSS fallback patterns, Tailwind v4 @theme and migration

Bundled files

The model reads these on demand while the skill is loaded. They are exposed as readable files and are never executed.

Frequently asked questions

What does the Oklch Skill AI skill do?

Why use Oklch Skill on TypingMind?

Because you install it once and use it with any model. Oklch Skill is plain Markdown rather than provider-specific code, so the same skill runs on GPT-5, Claude, Gemini, Grok, or a local model — and you can switch model mid-chat without it breaking. TypingMind runs on your own API keys, so you pay providers directly instead of a per-seat subscription, and your skills and chats stay in your own storage.

How do I install Oklch Skill in TypingMind?

Open Plugins → Skills → Install from GitHub in TypingMind and paste https://github.com/jakubkrehel/oklch-skill/tree/main/skills/oklch-skill. TypingMind reads its SKILL.md and bundles its files and installs it as a skill you can enable per chat.

Which AI models can use Oklch Skill?

Any model you connect in TypingMind. AI skills are plain Markdown instructions rather than provider-specific code, so GPT, Claude, Gemini, Grok, and local models can all load this skill when a request matches it.

How many AI models can I use with Oklch Skill?

As many as you like. As long as a model supports skills, you can use Oklch Skill with it — GPT, Claude, Gemini, Grok, DeepSeek, Mistral, Llama and more — all on TypingMind with your own API keys.

Is the Oklch Skill AI skill free?

Yes. It is published on GitHub by jakubkrehel under the MIT license. You only pay your own AI provider for the tokens you use.

What are AI skills?

An AI skill is a reusable instruction bundle that teaches an AI model how to do one specific task. It follows the open Agent Skills format: a SKILL.md file with a name and description, plus any scripts, templates or reference files the model may need. The model reads the instructions only when your request matches the skill, so an installed skill costs nothing until it is used.

How are AI skills different from plugins or MCP servers?

A plugin or MCP server gives a model new tools to call — code that runs somewhere and returns a result. An AI skill gives the model knowledge and process instead: how to approach a task, which steps to follow, what good output looks like. Skills are plain Markdown, so they need no server, no API key and no runtime, and they work with any model.

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Overview

Installation

Install in TypingMind

Install in another agent

Use it in TypingMind

Works with any AI model

Skill instructions

OKLCH Colors

Quick Reference

Why OKLCH

OKLCH Syntax

Key Thresholds

Review Output Format

Common Mistakes

Reference Files

Bundled files

Frequently asked questions

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