GoKawiilNew open-source tool SIwithin sandboxes Claude Code and Codex CLIs with spend caps
A developer released SIwithin, a single-file Python tool that runs AI coding CLIs like Claude Code and OpenAI Codex unattended, restricting them to specified folders and enforcing a dollar budget per run. It uses a loopback proxy to meter Claude API requests with a per-run token instead of the user's real key, and logs one record per run showing cost and completion status. The tool currently works only on macOS and refuses to run on Linux or Windows.