Working with AI harnesses and doing a lot of experiments have taught me a lot. So I created Pocket Harness, which is super minimal C++ Linux native open source Agentic Coding Harness that works pretty much with most of the LLM providers. It is safe, fast, and has no dependencies. It is a TUI coding harness. It has TUI as a user interface, which is also built from scratch.
check it out: https://github.com/yunusemrejr/pocketharness