multica-ai/multica · error

color must be a 6-digit hex value like #3b82f6

Error message

color must be a 6-digit hex value like #3b82f6

What it means

Error "color must be a 6-digit hex value like #3b82f6" thrown in multica-ai/multica.

Source

Thrown at server/internal/handler/label.go:112

		return value, nil
	default:
		return "", errors.New("resource_type must be issue, agent, or skill")
	}
}

// 6-digit hex, with or without leading '#'.
var hexColorRE = regexp.MustCompile(`^#?[0-9a-fA-F]{6}$`)

// normalizeColor returns a canonical "#rrggbb" form or an error if invalid.
//
// LOAD-BEARING INVARIANT: LabelChip renders `style={{ backgroundColor: color }}`
// directly in the frontend. If this regex is ever relaxed to accept arbitrary
// CSS (named colors, `url(...)`, etc.), that inline style becomes an injection
// surface. Keep the regex strict.
func normalizeColor(c string) (string, error) {
	c = strings.TrimSpace(c)
	if !hexColorRE.MatchString(c) {
		return "", errors.New("color must be a 6-digit hex value like #3b82f6")
	}
	if !strings.HasPrefix(c, "#") {
		c = "#" + c
	}
	return strings.ToLower(c), nil
}

const maxLabelNameLen = 32

// validateLabelName trims and validates a label name. Returns the trimmed
// name or an error suitable for a 400 response.
func validateLabelName(raw string) (string, error) {
	for _, r := range raw {
		if unicode.IsControl(r) {
			return "", errors.New("name cannot contain tabs, newlines, or control characters")
		}
	}
	name := strings.TrimSpace(raw)

View on GitHub (pinned to 2c0912b6ec)

Solutions

1. Pass a 6-digit hex color with a leading '#', e.g. #3b82f6.

When it happens

Trigger: Thrown at server/internal/handler/label.go:112 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of multica-ai/multica@2c0912b6ec (2026-08-15). Data as JSON: /api/errors/f85c7cb75bd611a2. Report an issue: GitHub.