Because you are using LLMs to write code that you would be writing by hand.
Use it to write thing you wouldn't have time to write by hand and that are not mission critical: custom linters, support tools and so on. You know, each time you think to yourself "hey, I would write something to automate this chore, if only I could set aside one or two days".
You can also use it to document silly things you wouldn't take time to but that provide context to agents. Ask it to do a performance audit and to give you a few SQL queries and bash commands to gather stats about prod and logs. Then commit this document.
Will you read it? No. But your agent will use it to write code that's fit.
Keep doing this and 1/ you will be more productive, 2/ your agent will progressively improve so that you will let it do more and more.