What a summary can and cannot do
Summarizing is one of the most popular uses of AI assistants, and it is easy to see why: a forty-page report becomes a page in seconds. The risk is that a summary is a lossy copy. It leaves things out, and the assistant decides which things. Sometimes those choices drop the one clause or figure that mattered.
Treat an AI summary as a map for deciding where to read closely, not as a replacement for reading when the stakes are real.
Decide first whether the document is safe to share
Before you paste or upload anything, ask what the document contains. Contracts, personnel files, medical details, customer records and unreleased financial results are the usual concerns. Check your organization’s rules and the tool’s terms about what happens to submitted text; the topic of data retention is worth understanding before you start, since tools differ in what they keep and for how long.
Options when a document is sensitive:
- Use a tool your organization has approved for that type of material.
- Remove names, account numbers and other identifiers first.
- Summarize only the non-sensitive sections.
- Skip the AI step and summarize it yourself.
Using an unapproved tool with confidential files is the kind of habit that leads to shadow AI problems, so when in doubt, ask before you paste.
Prepare the document
Long documents often contain clutter: headers and footers repeated on every page, tables that came through as jumbled text, scanned pages with errors. Poor extraction produces poor summaries. A quick look at what you are actually submitting can save confusion later.
Very long documents may also exceed what a tool can handle at once. Some tools quietly work from only part of the text. If the document is long, it is often safer to summarize it section by section, then ask for a combined overview of those section summaries. This also makes checking easier.
Write a specific request
“Summarize this” gets you a generic result. Tell the assistant what you need it for.
For example: “Summarize this report for a manager who has five minutes. Give me the main conclusion, the three most important findings, and any recommendations with deadlines. Use bullet points under 200 words total.”
Useful additions include:
- Audience and purpose: who is reading and what decision it supports.
- Structure: key points, open questions, deadlines, numbers.
- Instruction to stay faithful: “Use only the text provided. If something is unclear or missing, say so rather than guessing.”
- Request for locations: “Note the section or page where each point appears.” This is not always reliable, but it gives you a place to start checking.
Our broader guide on writing prompts covers the task, context and format pattern behind requests like this.
Special care with contracts
Contracts are a place where small wording changes the meaning. A summary may smooth over conditions, exceptions, notice periods or liability limits. An assistant can help you get oriented, for example by listing the parties, the term, the payment terms and the termination clause. It cannot tell you whether the agreement is fair or safe to sign.
Any summary of a legal document is general information, not legal advice. For anything you will sign, rely on the full text and a qualified professional. The limits of contract review assistance are discussed more fully in our article on what such tools can and cannot do.
Verify before you rely on it
A short routine goes a long way:
- Spot-check the claims. Pick several statements from the summary and find them in the original. Pay extra attention to numbers, dates, names and anything that sounds strong.
- Look for omissions. Ask: “What important points or caveats from the document are not in this summary?” Then scan the original’s headings yourself to see whether anything big is missing.
- Watch for additions. Language models sometimes add plausible-sounding details that were never in the source. This is a known cause of fabricated answers, and it can happen even when you supplied the text.
- Check the conclusions. If the summary says “the report recommends X,” confirm that the report actually says so, and not that the assistant inferred it.
- Keep the original attached. If you share a summary with others, share the source or a way to find it, and say that the summary was produced with AI assistance.
A second set of eyes helps for important documents. A human review step is easier to keep when the summary and original are open side by side.
Be honest about the result
If you pass a summary along to colleagues or clients, state how it was produced and what you checked. People can then decide how much to rely on it. This ties in with broader expectations around AI disclosure in many workplaces.
Where summaries work well
Summaries tend to work best for low-risk, high-volume reading: skimming long articles, getting a first view of a report, organizing your own notes before a meeting, or deciding which of several documents deserves a full read. They work worst when the cost of a missed detail is high and no one will read the original.
Results vary between tools, documents and runs. A reasonable rule: the higher the stakes, the more of the original you should read yourself.