Claw Code is an open-source Rust implementation of an AI coding agent CLI harness, inspired by the Claude Code architecture. It provides a full agent loop for connecting LLMs to tools, file systems, and task workflows through a clean command-line interface with commands like login, prompt, and doctor. Built for deterministic and reproducible operations, it includes OAuth authentication, session management, and a mock-service testing harness, making it the fastest repository in GitHub history to surpass 100K stars.