alt Hacker NewsCodex and Claude Code store all this too. Lately I've started having each agent regularly read each other's chat transcripts as well as their own, including even the very same session I'm in. (With big contexts they increasingly forget a few things that they re-learn by just looking at the verbatim transcript.)
I don't think it's worth writing my own harness or switching to Pi and writing a plugin, but I definitely need to create some skills to automate much of this.
It is not worth switching to Pi except as a hobbyist.
Something that is overlooked: the mainstream harnesses have a huge advantage in telemetry and datapoints to use to improve the harness. They have internal teams building the tooling. They have tight integration built-in with their own backends (e.g. optimizing for caching).
Are you tinkering? Or trying to build something useful? If you're trying to build something useful, use a tool.
In this era of software when you can build almost anything you can imagine, why spend that time building plugins for a harness?