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Prompt

The request sent to an AI for one piece of work, typed by a person or chosen from a saved list.

A prompt is the request sent to an AI for one piece of work. A person can type it or choose it from a saved list. It says what work the AI should do, with any material provided for the task. The request joins that material and any standing instructions in the AI's context.

A planner is considering moving Keith Brennan's old personal pension. The provider's four-page reply to the firm's questions goes into the AI product with a shared prompt: "Summarise this letter in five bullet points." The summary covers the transfer value, fund, charges, exit charge and retirement age. It omits a guaranteed annuity rate on page three. The planner writes in a draft suitability report that the plan has no guarantees. Compliance checks the provider's reply before sign-off and finds the guarantee.

The prompt asked for a short summary, without saying it was for a possible pension move or asking about guarantees. A better request would name that purpose and ask what the provider says about guarantees and protected tax-free cash. The answer would still be the AI's reading of the letter. The planner checks those points in the provider's reply before using them in advice; a more specific prompt does not prove the summary is complete.

Not to be confused with

  • A person types or chooses a prompt for a piece of work. When a product uses standing instructions, it may send them with requests without showing them to the person asking. Vendors sometimes call them the system prompt.
  • The context is everything the AI is given for the work. The prompt is one part of it.
  • A prompt on a shared list, sometimes called a prompt library, keeps the request's wording or structure consistent. The AI can still answer it differently each time.
  • In back-office software, a prompt can mean a message the software shows a person, such as a reminder that a review is due. An AI prompt goes the other way: a person gives it to the AI.

Overheard

PrincipalShould we take the five-bullet prompt off the shared list?

PlannerRewrite it. It should say the summary is for moving a pension and ask about guarantees and protected tax-free cash by name. Even then, I'll read the letter before anything goes in the report.

Where it sits

Prompt

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Sources

Last reviewed 29 SEPT 2026

  1. Prompting best practices ↗Anthropic, Claude Platform documentation · 29 SEPT 2026
  2. Prompt engineering ↗OpenAI, API documentation · 29 SEPT 2026
  3. Lost in the Middle: How Language Models Use Long Contexts ↗Liu et al., Transactions of the Association for Computational Linguistics · 20 NOV 2023

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