For many years, I use Silverbullet as my note taking tool. Its a self hosted open source web app that saves your notes as Markdown.
Perfect to be used by agents. Often when I’m on the gym or working, I explore some idea but I’m not ready to implement it, I just ask pi to save as a note and it puts to its own list, that I can ask it to retrieve later.
This pattern is easily portable to any harness or note taking system, it can even store in your local disk. Just ask your harness of choice to implement it.