AIToolDesk

Summarizing is one of the most popular uses of AI, and one of the easiest to get subtly wrong. A summary that drops a key exception or invents a figure can be worse than no summary at all. This method keeps AI summaries fast and trustworthy.

Step 1: Decide what the summary is for

“Summarize this” gives the model no target. A summary for a manager deciding whether to sign a contract needs different content from one for a colleague who just wants the gist. Tell the AI who will read it and what decision it supports.

Step 2: Use a structured prompt

You are summarizing a [document type] for [audience], who needs to [decision or purpose].

1. Give a 3-sentence overview.
2. List the key points as bullets.
3. List every number, date and deadline mentioned, with where it appears.
4. List risks, exceptions or open questions.

Use only information from the document. If something is unclear, say so.

Document: [paste]

Asking for numbers and exceptions separately makes them much harder to lose.

Step 3: Split very long documents

If a document is longer than the tool handles comfortably, summarize it section by section, then ask for a final summary of the section summaries. This also helps with details buried in the middle, which models can overlook in very long inputs. Our guide to context windows explains why.

Step 4: Check the summary against the source

• Spot-check every number and date against the original.
• Ask: “Quote the exact sentence from the document that supports each key point.” Then search the document for those sentences.
• Ask: “What important points from the document did your summary leave out?”

If a supporting quote can’t be found in the source, treat that point as unreliable. More checks are in our guide to AI hallucinations.

Common mistakes

• Trusting a summary of a scanned document without checking that the text was read correctly.
• Letting the AI add outside knowledge when you only want what the document says.
• Using a summary for legal or financial decisions without reading the relevant sections yourself.
• Pasting confidential documents into tools your organization hasn’t approved. See our privacy guide.

Key takeaways

• Tell the AI who the summary is for and what it supports.
• Ask for numbers, dates and exceptions as separate lists.
• Verify against the source before you rely on it.