Make the request testable.

A vague prompt leaves important choices unstated. A small specification describes observable behavior so the agent and the reviewer know what “done” means.

Example: a personal task list

The prompt

“Build me a task list.”

What can I do with a task? Should it still be there after a refresh?

A small specification

Add a task with a non-empty title.
Mark it complete or delete it.
Keep tasks in this browser after a refresh.
Leave accounts and sharing out of scope.

One acceptance check: add “Read chapter one,” refresh the page, and confirm the task is still there. A specification guides the work; testing checks whether it was followed.