Give your AI coding agent a verified color system

One brand hex → full light & dark semantic theme (23 roles each), per-pair WCAG ratio + APCA Lc, fix suggestions.

Input sample (arguments the agent passes)

{
  "brandHex": "#EA580C"    // Brand color (6-digit hex)
}

Real output sample (brand #EA580C)

{
  "brand": "#ea580c",
  "tokens": {
    "light": {
      "background": "#fafafa",
      "surface": "#ffffff",
      "primary": "#ea580c",
      "primaryForeground": "#270000"
      // … 23 roles in total
    },
    "dark": {
      "background": "#0a0a0a",
      "primary": "#ff8d61"
      // … 23 roles in total
    }
  },
  "contrast_checks": [
    {
      "foreground": "primary",
      "background": "background",
      "wcag_ratio": 8.71,
      "wcag_pass": true,
      "apca": {
        "lc": -57.6
      }
    }
    // … 26 measured pairs; failing ones include a fix
  ]
}

Real engine output — every contrast number is measured, not copied from docs.

Then ask your agent:

list the color tokens for #4F46E5

If it replies with named roles — background, surface, primary, on-primary — plus measured contrast numbers, you are connected.