A prompt library is a collection of ready-written prompts that employees can copy and reuse for recurring tasks.
Prompt libraries are popular because they promise a quick start. I don't recommend them. A ready-made prompt was written for a different task, a different audience and a different situation from the one you are in. Used as a template, it skips the most important step: being clear about what you want from the task.
That step is what makes the result good. What is the purpose? Who is the audience? Which sources should be used? Anyone who can answer those questions can write a good prompt themselves. Anyone who cannot will not get a better result from a copied prompt.
Prompt libraries also date quickly. The models change, and prompts that worked six months ago give different results today.
In practice
Instead of a library, I train employees to put together their own prompt with the FOCUS model: purpose, circumstances, sources, format and style. It is quick to learn, and it works across tasks and tools.
The concepts in this glossary run through my AI courses and workshops, where we work with them on your own tasks.