I've been running a persistent Firecracker VM per user in production. This article is what that taught me about the three ways to give an agent a computer — and why they are not interchangeable.

I've been building an agent into AgentsFS. I started by rolling my own agent, building my own model loop, my own streaming, my own tools, my own hosting. Then, I rebuilt it on Vercel's modern agent framework, Eve to see what the difference was.