AFAIK the two most popular open source harnesses right now are OpenCode and Pi. They take a pretty different approach, OpenCode includes a lot of features while Pi is very minimal by design and focused on extensibility, to the point where many people are just asking Pi to write a plugin for itself whenever they want it to have a new feature. I personally like Pi's philosophy more and I think its developer justified the choices really well in his blog post:
Oh damn, I haven't noticed because my browser removes the referer header. But I think the image on the block page is a pretty good answer to why he did that.
The image shows Garry Tan, the CEO of Y Combinator. He has lately been on a huge AI psychosis streak, bragging about things like "shipping 37000 lines of code every day" and "using Claude Code so much it burned out his USB-C power connectors". He's in a lobster suit because he's talking about OpenClaw, an AI agent assistant which those same AI psychosis types lean into too much by giving it full read-write access to all their life and then getting surprised when it accidentally deletes all of their emails.
Pi's developer is obviously not anti-AI, and he definitely doesn't hate OpenClaw, since it's based on Pi. But there's a growing number of people who take those things too far, and a lot of them are on HN. You can easily find them in the comments of any AI-related post here. I assume that's the type of people the image is portraying.
https://mariozechner.at/posts/2025-11-30-pi-coding-agent/#to... (the pi-coding-agent section)