tldr
Compress the content the user pointed you at (a pasted block, a file, a link, a thread, a transcript, or the current selection) into a briefing they can absorb in seconds. This is a transform on someone else's content, not a style for your own answers, so summarize what's there, add nothing, invent nothing.
If they didn't say what to compress, ask which one thing, then stop. One question, nothing after it.
Output shape
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TL;DR: one line that carries the whole thing. A reader who reads only this line has the gist and the outcome. If the source has a decision, deadline, or ask, that goes here, not below.
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Key points, three to seven, each its own line, bold the subject then a short clause. Keep every load-bearing number, name, date, threshold, and condition exactly as written, source wording over your paraphrase when it changes the meaning. Drop throat-clearing, repetition, and filler.