JXA script to summarize text using SKSummary from the CoreServices framework.

SummarizeText.js

(() => {
	ObjC.import("CoreServices")

	const unsummarizedText = `Inventore eveniet eum veritatis inventore necessitatibus provident. Sit reprehenderit non ad. Blanditiis impedit sapiente. Incidunt harum neque commodi rerum nobis dolor aliquam. Ipsam consequatur distinctio ratione veniam hic. Possimus iure molestiae tempore cumque reiciendis repudiandae quibusdam.`
	const numOutputSentences = 3
	
	const CFStringRef = $.CFStringCreateWithCString(null, unsummarizedText, $.kCFStringEncodingMacRoman)
	const summaryObj = $.SKSummaryCreateWithString(CFStringRef)
	const summaryText = ObjC.castRefToObject($.SKSummaryCopySentenceSummaryString(summaryObj, numOutputSentences)).js
	return summaryText
})()