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Agent skill

Color Accessibility And Mode

by hashgraph-online in hashgraph-online/awesome-codex-plugins

A skill your agent uses when designing color systems that must satisfy accessibility requirements, work in both light and dark modes, support high-contrast preferences, and remain meaningful for…

Apache-2.0Auto-check passedFrontend & Design

Install Color Accessibility And Mode

skills CLI
$ npx skills add hashgraph-online/awesome-codex-plugins --skill color-accessibility-and-mode -a claude-code

Project install by default; add -g for ~/.claude/skills/.

GitHub CLI
$ gh skill install hashgraph-online/awesome-codex-plugins color-accessibility-and-mode --agent claude-code

Project scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).

Manual copy
$ git clone --depth 1 https://github.com/hashgraph-online/awesome-codex-plugins.git skills-src && mkdir -p .claude/skills && cp -r skills-src/plugins/HDeibler/universal-design-principles/plugins/perception-and-hierarchy-principles/skills/color-accessibility-and-mode .claude/skills/color-accessibility-and-mode && rm -rf skills-src

Use ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.

Claude Code skills documentation · loads skills from .claude/skills/

Facts

Skill name
color-accessibility-and-mode
GitHub stars
1.3k
Token cost
~1.9k tokens
SKILL.md length
832 words
Files
2 (incl. references)
Skills in repo
716
Repo updated
First seen
Licence
Apache-2.0

At a glance

A skill your agent uses when designing color systems that must satisfy accessibility requirements, work in both light and dark modes, support high-contrast preferences, and remain meaningful for…

  • Works in 5 steps: Run a contrast checker. Every… → Simulate color blindness. Chrome… → Test in dark mode. Toggle the OS… → …
  • Designing color systems that must satisfy accessibility requirements
  • SKILL.md covers WCAG contrast in practice, Color blindness, Dark mode and High-contrast mode, plus 6 more sections
  • Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md

What it does

Color Accessibility And Mode is an agent skill from hashgraph-online/awesome-codex-plugins. Use this skill when designing color systems that must satisfy accessibility requirements, work in both light and dark modes, support high-contrast preferences, and remain meaningful for users with color blindness or low vision. Trigger when picking text colors, designing for global compliance (WCAG, EAA, ADA), supporting dark mode, or auditing an existing palette for accessibility. Sub-aspect of color; read that first.

Its SKILL.md is about 1.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 2 other files, including reference files (for example `references/wcag-and-mode-support.md`).

It sits in Frontend & Design, covering Accessibility and Theming and dark mode. The repository describes itself as: A curated list of awesome OpenAI Codex / ChatGPT plugins, skills, and resources. The 1 Codex Marketplace. See live plugins at: https://hol.org/plugins/best-codex-plugins. The licence is Apache-2.0.

When your agent uses it

  • Designing color systems that must satisfy accessibility requirements
  • Work in both light and dark modes
  • Support high-contrast preferences
  • Remain meaningful for users with color blindness

Example prompts

  • “/color-accessibility-and-mode”

Workflow steps

5 steps, taken from the first numbered list in SKILL.md.

  1. Run a contrast checker. Every text/background pair, every UI/background pair. AA at minimum.
  2. Simulate color blindness. Chrome DevTools or a dedicated tool. Status systems that lean on red/green collapse here.
  3. Test in dark mode. Toggle the OS preference; check every page.
  4. Test with forced colors. Edge in High Contrast mode reveals what depends on color.
  5. The grayscale test. If the design works in grayscale, color is enhancement; if not, color is load-bearing and must satisfy accessibility…

What it can do on your machine

Read from SKILL.md and the folder at commit 3e1456a. It shows what the files ask for, not the result of running them.

  • Tool permissions

    Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

    From allowed-tools in the SKILL.md frontmatter.

  • Runs code

    No scripts in the folder and no shell commands in SKILL.md (its code samples are css).

    From the folder's file list and the shell code blocks in SKILL.md.

  • Network

    No URLs in SKILL.md.

    From URLs in SKILL.md, links to its own repository left out.

  • Credentials

    Names no API keys, tokens, secrets or passwords.

    From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Color Accessibility And Mode loads about 1.9k tokens when it runs, and up to ~3.1k if it reads all its reference files. Until then it costs about 113 tokens; SKILL.md has 832 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it
~113
When it runs · the whole SKILL.md, loaded when a task matches
~1.9k
With references · SKILL.md plus every file in references/, read only if the agent opens them
~3.1k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Auto-check passed

The automated check found no risky patterns in SKILL.md.

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from hashgraph-online/awesome-codex-plugins at commit 3e1456a, republished under its Apache-2.0 licence (© hashgraph-online). 832 words, ~1,938 tokens.

Download SKILL.mdSave it as .claude/skills/color-accessibility-and-mode/SKILL.md (or your agent's skills folder). This skill also uses 1 other file; get the full folder from GitHub.
name
color-accessibility-and-mode
description
Use this skill when designing color systems that must satisfy accessibility requirements, work in both light and dark modes, support high-contrast preferences, and remain meaningful for users with color blindness or low vision. Trigger when picking text colors, designing for global compliance (WCAG, EAA, ADA), supporting dark mode, or auditing an existing palette for accessibility. Sub-aspect of `color`; read that first.

Color: accessibility and mode support

Accessibility-aware color isn't a polish layer; it's a constraint that shapes the palette from the start. Adding accessibility late is much more expensive than building it in. The core constraints: WCAG contrast ratios, color-blindness compatibility, high-contrast mode support, and dark-mode parity.

WCAG contrast in practice

Required ratios (relative luminance):

ContentLevel AALevel AAA
Body text (< 18pt regular or < 14pt bold)4.5:17:1
Large text (≥ 18pt regular or ≥ 14pt bold)3:14.5:1
UI components and graphical objects3:1(no AAA)

To check a color pair: any contrast tool (WebAIM, Stark, Chrome DevTools' contrast inspector). If you're picking from a designer's mockup, run every text/background pair through. Common failures:

  • Light grey body text on white (#999 or #aaa).
  • Brand-color body links on white when the brand is mid-tone.
  • Placeholder text in inputs (often unreadable).
  • White text on light brand backgrounds.

Practical rule: pick body text colors at neutral-700 or darker on light backgrounds; never use anything lighter than neutral-500 for content the user must read.

Color blindness

Approximate prevalence in populations of European descent:

  • Deuteranopia / deuteranomaly (red-green): ~6% of men, ~0.4% of women.
  • Protanopia / protanomaly (red-green, slightly different): ~2% of men.
  • Tritanopia / tritanomaly (blue-yellow): ~0.01%.
  • Achromatopsia (full color blindness): ~0.003%.

Other populations have different rates — generally lower red-green prevalence in some Asian populations.

Practical implications:

  • Don't rely on red-green distinction alone for status. Use icon, text, or pattern alongside.
  • Avoid red-on-green or green-on-red combinations for important text.
  • Test with simulators: Chrome DevTools → Rendering → Emulate vision deficiencies. Or Stark, Sim Daltonism, Color Oracle.

Dark mode

Dark mode is no longer optional for new products. Macs, iPhones, and Androids all default to dark in some contexts; users expect it.

Common pitfalls:

Pure inversion is wrong

Inverting a light palette doesn't produce a good dark palette. Saturation perception is different on dark backgrounds; very-saturated colors that read fine on white look glaring on black. Build dark-mode tokens deliberately.

Tinted neutrals work better than pure black

Pure white text on pure black is high-contrast but hard on the eyes and produces strong "halation" (blur) on OLED screens. Most well-tuned dark modes use:

  • A near-black background (not pure black): hsl(220 10% 8%).
  • Off-white text: hsl(0 0% 90%) or so.
  • Tinted neutrals keeping the same hue cast as light mode.
Adjust saturation downward

Saturated colors that work on white backgrounds need toning down for dark. A primary brand at hsl(220 90% 50%) may need to be hsl(220 70% 60%) in dark mode to feel comfortable.

Test contrast in both modes

A pair that passes AA in light mode may fail in dark mode. The luminance values differ; recheck.

High-contrast mode

Many operating systems offer a high-contrast mode for low-vision users. Web equivalents:

  • Windows High Contrast Mode (now "contrast themes")
  • prefers-contrast: more CSS media query

In these modes, the user has explicitly requested maximum contrast. Designs should:

  • Avoid relying on subtle color distinctions.
  • Ensure all text/background pairs hit AAA contrast.
  • Avoid background images or gradients that might obscure text.
  • Use strong, defined borders.
css
@media (prefers-contrast: more) {
  :root {
    --neutral-700: hsl(0 0% 0%);
    --background: hsl(0 0% 100%);
    --border: hsl(0 0% 0%);
    /* ...etc... */
  }
}
Show full SKILL.md (332 more words)Show less

Forced colors mode

Some users (particularly with low vision or migraine sensitivity) override page colors entirely with system colors via Windows' Forced Colors Mode. The browser maps your colors to a small set of system tokens (Canvas, CanvasText, LinkText, ButtonText, ButtonFace, etc.).

In this mode:

  • Background images may be hidden.
  • Custom colors are overridden.
  • The page should still be usable.

Design implications:

  • Use <button> for buttons; the system colors map correctly.
  • Don't rely on background images for critical info.
  • Test in Forced Colors Mode (Edge: Settings → Accessibility → "High contrast").

Color and motion / animation

Color transitions can trigger photosensitive epilepsy if they flash rapidly (3+ Hz, especially with red). WCAG 2.3.1: no content flashes more than 3 times per second.

Design implications:

  • No strobing animations.
  • Loading spinners should rotate, not flash colors.
  • Auto-playing animations should respect prefers-reduced-motion.

Worked example: a fully accessibility-aware palette

css
:root {
  /* Light mode */
  --bg: hsl(0 0% 100%);
  --fg: hsl(220 6% 12%);          /* near-black; contrast 17:1 on white */
  --fg-muted: hsl(220 6% 40%);    /* 7.4:1 — passes AA body, AAA large */
  --primary: hsl(220 90% 45%);    /* 5:1 on white — AA body */
  --destructive: hsl(0 75% 40%);  /* 5.5:1 on white — AA body */
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: hsl(220 10% 9%);
    --fg: hsl(220 6% 92%);          /* 12:1 on dark */
    --fg-muted: hsl(220 6% 65%);    /* 5.5:1 — AA body */
    --primary: hsl(220 80% 65%);    /* tuned brighter for dark mode */
    --destructive: hsl(0 70% 60%);  /* tuned brighter for dark mode */
  }
}

@media (prefers-contrast: more) {
  :root {
    --fg: hsl(0 0% 0%);
    --bg: hsl(0 0% 100%);
    --fg-muted: hsl(0 0% 20%);
    /* etc. */
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

Anti-patterns

  • Color-only signals. Red asterisks for required fields with no * or "required." Color-blind users miss it.
  • Light grey body text that looks "elegant" in mockups but fails AA in production.
  • Dark mode by inversion. Pure inversion produces glare and saturation issues.
  • Ignoring prefers-contrast and forced-colors. Your design works for typical users but fails for users with explicit accessibility needs.
  • Status that depends on hue alone. Color-blind users can't distinguish red from green; pair with icon and text.

Heuristics

  1. Run a contrast checker. Every text/background pair, every UI/background pair. AA at minimum.
  2. Simulate color blindness. Chrome DevTools or a dedicated tool. Status systems that lean on red/green collapse here.
  3. Test in dark mode. Toggle the OS preference; check every page.
  4. Test with forced colors. Edge in High Contrast mode reveals what depends on color.
  5. The grayscale test. If the design works in grayscale, color is enhancement; if not, color is load-bearing and must satisfy accessibility constraints.
  • color (parent).
  • color-semantic-systems — building the semantic layer this skill makes accessible.
  • hierarchy-color-and-tone — using tone (not just hue) for hierarchy.
  • accessibility-perceivable (process) — covers color contrast and other perceivable concerns.

© hashgraph-online, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 1 other file (references) in plugins/HDeibler/universal-design-principles/plugins/perception-and-hierarchy-principles/skills/color-accessibility-and-mode of hashgraph-online/awesome-codex-plugins.

  • SKILL.md
  • references/wcag-and-mode-support.md

Open the folder on GitHubat commit 3e1456a

Compare with similar skills

Color Accessibility And Mode next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.

Color Accessibility And Mode compared with similar skills
SkillStarsUsed inTokensAuto-checkLicenceRepo updated
Color Accessibility And Mode this skillhashgraph-online/awesome-codex-plugins1.3k—~1.9kAutomated safety check: PassApache-2.0
Color Auditrome-os/rome743—~2.7kAutomated safety check: PassMIT
Ant Designkqcoxn/MaaPipelineEditor4081 repos~1.1kAutomated safety check: PassMIT
Better Colorstrycompai/crm11k—~1.9kAutomated safety check: PassMIT
Data-Dense Dashboard Designerplugin87/ux-ui-agent-skills1.6k—~2.6kAutomated safety check: PassMIT
Material Design 3 UI/UX Guideskydashnet/material-design-3-ui-skill138—~3kAutomated safety check: PassMIT

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Categories

Questions about Color Accessibility And Mode

What does Color Accessibility And Mode do?

A skill your agent uses when designing color systems that must satisfy accessibility requirements, work in both light and dark modes, support high-contrast preferences, and remain meaningful for…. Color Accessibility And Mode is an agent skill from hashgraph-online/awesome-codex-plugins. Use this skill when designing color systems that must satisfy accessibility requirements, work in both light and dark modes, support high-contrast preferences, and remain meaningful for users with color blindness or low vision.

When should I use Color Accessibility And Mode?

Color Accessibility And Mode fits situations like: designing color systems that must satisfy accessibility requirements; work in both light and dark modes; support high-contrast preferences; remain meaningful for users with color blindness.

How do I install Color Accessibility And Mode in Claude Code?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill color-accessibility-and-mode -a claude-code`. Or copy the skill folder (plugins/HDeibler/universal-design-principles/plugins/perception-and-hierarchy-principles/skills/color-accessibility-and-mode in hashgraph-online/awesome-codex-plugins) into .claude/skills/color-accessibility-and-mode in your project. Claude Code loads it when a task matches its description.

How do I install Color Accessibility And Mode in Codex?

Run `npx skills add hashgraph-online/awesome-codex-plugins --skill color-accessibility-and-mode -a codex`. Or copy the skill folder (plugins/HDeibler/universal-design-principles/plugins/perception-and-hierarchy-principles/skills/color-accessibility-and-mode in hashgraph-online/awesome-codex-plugins) into .agents/skills/color-accessibility-and-mode in your project. Codex loads it when a task matches its description.

Can I use Color Accessibility And Mode in Cursor, Gemini CLI or GitHub Copilot?

Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add hashgraph-online/awesome-codex-plugins --skill color-accessibility-and-mode -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/color-accessibility-and-mode, .gemini/skills/color-accessibility-and-mode, .github/skills/color-accessibility-and-mode and .opencode/skills/color-accessibility-and-mode in your project.

What does Color Accessibility And Mode need to run?

SKILL.md names no scripts, command-line tools or credentials: Color Accessibility And Mode is instructions for the agent only.

Does Color Accessibility And Mode access the network?

SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.

Is Color Accessibility And Mode safe to install?

Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.

What licence does Color Accessibility And Mode use?

Color Accessibility And Mode is published under the Apache-2.0 licence (the repository's licence). It allows redistribution, so the full SKILL.md is shown on this page.

How many tokens does Color Accessibility And Mode use?

About 1.9k tokens (SKILL.md is roughly 7.8k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 1.1k tokens, read only when the agent opens those files.

What are the alternatives to Color Accessibility And Mode?

Skills that share tags, products or a category with Color Accessibility And Mode: Color Audit (rome-os/rome, 743 stars), Ant Design (kqcoxn/MaaPipelineEditor, 408 stars), Better Colors (trycompai/crm, 11k stars) and Data-Dense Dashboard Designer (plugin87/ux-ui-agent-skills, 1.6k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.

Who maintains Color Accessibility And Mode?

hashgraph-online (a GitHub organization) maintains it in hashgraph-online/awesome-codex-plugins, which has 1,267 GitHub stars. The repository holds 716 skills in this directory. The repository was last updated on October 10, 2026.

Source: hashgraph-online/awesome-codex-plugins on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.