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jholhewresjholhewres/devclaw-skills/skills/color-contrast/SKILL.md

color-contrast

Skill4 starsChanged 9 months agoMITView on GitHub

Calculate WCAG color contrast ratios

We split this skill into the rules it gives an agent

1 rule. 0 are common, 1 is distinctive, and 0 are very specific to this project.

  • 0

    Common

    Most of the 4 edited versions we read keep these.

  • 1

    Distinctive

    This author's own choices. Worth a look.

  • 0

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Test both light and dark mode combinations

    line 39

“Common” is measured: kept by at least 6 in 10 of the 4 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Color Contrast Checker

Calculate WCAG contrast ratios using bash + Python (or inline math).

Quick Check (Python one-liner)

python3 -c "
def lum(r,g,b):
    cs = [c/255.0 for c in (r,g,b)]
    cs = [(c/12.92 if c<=0.03928 else ((c+0.055)/1.055)**2.4) for c in cs]
    return 0.2126*cs[0]+0.7152*cs[1]+0.0722*cs[2]
def contrast(fg,bg):
    l1,l2 = max(lum(*fg),lum(*bg)),min(lum(*fg),lum(*bg))
    return (l1+0.05)/(l2+0.05)
fg = (FG_R, FG_G, FG_B)
bg = (BG_R, BG_G, BG_B)
r = contrast(fg,bg)
print(f'Ratio: {r:.2f}:1')
print(f'AA Normal (4.5:1): {\"PASS\" if r>=4.5 else \"FAIL\"}')
print(f'AA Large (3:1): {\"PASS\" if r>=3.0 else \"FAIL\"}')
print(f'AAA Normal (7:1): {\"PASS\" if r>=7.0 else \"FAIL\"}')
"

WCAG Requirements

LevelNormal TextLarge Text
AA4.5:13:1
AAA7:14.5:1

Large text = 18pt+ regular or 14pt+ bold.

Tips

  • Convert hex to RGB: #FF6600 = (255, 102, 0)
  • Test both light and dark mode combinations
  • Common fail: light gray text on white background

Download now (ZIP)

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