Summarize a long document without losing the details

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Lesson 4 · 11 min

Summarize a long document without losing the details

By the end

A summary of a real document you can act on, with three facts checked against the original.

  1. 1Learn
  2. 2Try it
  3. 3Human check
  4. 4Quick check

Learn · 4 min

Why summaries lose the details

Ask for “a summary” and you get the gist: smooth, confident and missing the parts that matter to you. The date the price goes up. The “unless” clause. The one site the contract doesn’t cover. Summarizing means leaving things out, and the specifics are the first to go.

Length makes it worse. A very long document may be cut short or only partly read, depending on the tool and your plan, and the summary won’t necessarily say so. It summarizes what it saw.

None of this is a reason to avoid AI summaries. Reading twenty pages in seconds and pulling out the structure is something it does well. The trick is to ask in a way you can check.

Ask for the structure first

Before the summary, ask for a map: the document’s sections in order, one line each. If the outline stops at section 6 of 9, you know it didn’t read the whole thing.

For a long email thread, ask for a timeline instead: who said what, when, what was decided and what’s still open.

Then ask for the details, each with the section it came from, and the exact wording for anything someone could be held to:

  • Dates and deadlines
  • Amounts, prices and quantities
  • Names of people, companies and places
  • Obligations: who has to do what, by when
  • Exceptions and conditions: anything that starts with “unless” or “only if”

Then the summary, checked against three facts

Now ask for the summary, written for a named reader with a job to do: “half a page for our office manager, who needs to decide whether to renew.” Knowing who it’s for tells the AI what to keep. Then pick three facts yourself, from different parts of the original: a number, a date and an obligation. Find each one in the summary.

If all three are right, you have a reasonable summary. If one is wrong or missing, treat the whole thing as unchecked: get it corrected, then check the rest of the details list or read that section yourself. Last, ask what it left out: “What would someone acting on this need that isn’t in the summary?”

A summary can’t tell you whether a term is fair or safe to sign. That judgment stays with you, and for a contract that matters, with a lawyer. If the document lives in Google Docs or Word and your plan includes a built-in assistant, you can skip the copying and pasting; the method and the check stay the same.

In one sentence

Get the map before the summary, then check three facts yourself; if one is wrong, none of it is checked yet.

Try it on your business

7 min

Use a real document you need to act on this week: a contract, a supplier proposal, a policy update or a long email thread.

  1. 1

    Pick a document of roughly 5 to 20 pages. Take out personal details you don’t need, and check your plan’s data settings before pasting anything confidential. Check any confidentiality terms you’ve agreed to as well, for example with a supplier.

  2. 2

    Fill in the brackets and paste the text at the end, or attach the file if your assistant takes uploads. If it’s too long, do it a section at a time.

  3. 3

    Check that the outline runs from the first section to the last.

  4. 4

    Choose three facts from different parts of the original (a number, a date and an obligation) and find each one in the summary.

  5. 5

    Ask: “What would someone acting on this need that isn’t in the summary?” Add anything important before you share it.

Summarize the document below for [who will read it], who needs to [decide or do what].
Work in this order:
1. Outline: the document’s sections in order, one line each.
2. Key details: every date, deadline, amount, name, obligation and exception, each with the section it comes from. Quote obligations word for word.
3. Summary: under [200] words, including any conditions or exceptions that affect the decision.
4. Gaps: anything unclear, contradictory or cut off.
Use only what’s in the document. Mark anything you’re unsure about with [CHECK].
Document: [paste the text]
Open ChatGPTOpen ClaudeOpen Gemini

Human check: before you use it

Quick check · question 1 of 2No grades

Why ask for the document’s structure before the summary?

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Answers come from The Distillery’s own pages, with sources.

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