SIwithin runs Claude Code unattended inside a folder fence and a hard dollar budget
The single-file, stdlib-only Python tool (macOS only) confines a run to the folders you grant, blocks your home folder, and routes every API call through a loopback proxy that holds the real key, prices each response, and kills the run once the budget is spent. Its Codex CLI adapter is weaker: per the README it hasn't been tested against a live CLI and needs the key in the run's environment (write-up).
