Depends on the task but if you're going high level enough, it's not more work. Think about it this way: if you're doing proper development you're going to write code, tests and commit messages. Since you know what you want to achieve, write a really good commit message as the prompt, start writing tests and let the agent run in the meantime. Worst case, it doesn't work and you do the code yourself. Best case, it worked and you saved time.
(Not sure if that was clear but the steps/loop described before happens automatically, you're not babysitting it)
