fuxicodex/Fuxi ? reverse-engineered prompt

Build me a terminal based AI coding assistant called FuXi that feels fast and self contained. I want to open it with one command, chat with it in a nice text UI, and have it read files, edit code, run shell commands, search the project, and verify its own changes in a loop. It should work with any OpenAI compatible model, let me bring my own API key or log in, and handle provider routing and failover so it keeps going if one model is unavailable.

Please include durable sessions so I can come back later, resume work, and undo or fork from checkpoints. Add basic safety checks before running commands, plus status and usage info inside the UI. It should feel like a real coding agent for everyday tasks such as fixing tests, making refactors, and helping with code review. If you need to check current docs for any provider or tooling details, look them up online first.