Comment by frio

The harnesses we have are almost stunningly incomplete IMHO. I've been trying `pi` recently, and quite like that it comes with a minimal set of tools by default -- and that I can easily override or replace the ones that it ships.

I've only just started working with it, but clamping `read/write/edit` to only allow editing files in the current directory, banning `bash` and mandating I write tools for the specific commands I want it to execute, has made me much happier. Running Claude inside a VM or similar to sandbox it is nuclear overkill; I've always been surprised that that's seemed like the state of the art.

With a better harness, the model can't choose to rename things with search and replace; if it wants to rename things, it _must_ call the LSP to do it. If it's going to write code, as you suggest, the harness _forces_ linting/formatting to run.

(Reading my own comment back, I am worried that the fucking AI writing style is infecting me :()