Open sourcing the coding agent harness I started an year ago.

In January 2025, I started working on a coding agent harness for myself, I started it almost at the same time when claude code was announced. The first version of my coding harness was a TUI , I had given my harness a few basic tools, including read, write, execute command. But as models became better, more tools were added like running background processes etc. The reason i started this project was exploration of what LLMs can do.After a few months, I decided to create a UI for that and shift the environment from local to cloud, as was the case with many other providers like devin, claude code, codex, and cursor. But cloud hosted environments did not work for both enterprise and for individuals, reason being for the former that the enterprises does not want the code to be cloned on foreign infrastructure and for the latter it was an unnecessary cost for being able to close the laptop lid while your agent works.I call my Harness PhantomX. This is created on the idea of self hosted…