bajrangCoder/codecrafters-claude-code-rust ? reverse-engineered prompt

Build me a Rust version of a simple Claude Code style coding assistant for the Codecrafters challenge.

I want it to act like an LLM powered helper that can read a codebase, decide what to do next, and use tool calls to make changes or inspect files as needed. It should run from the command line through the existing program entry point, and keep working through an agent loop until it has finished the task or needs to stop. Please make it follow the challenge requirements in the repo, and get the starter implementation working so it can pass the early stages.

If anything is unclear, use the README and existing Rust files as the source of truth, and look up current docs online if you need to. Keep the solution practical and focused on making the assistant actually work end to end.