9th November 2025
Research
OpenAI Codex CLI Sandbox Implementation Analysis
— OpenAI Codex CLI's sandbox employs strong, platform-specific isolation to securely constrain the behavior of AI-driven code agents. On macOS, it uses Apple's Seatbelt sandbox with finely tuned dynamic policies, while on Linux, it combines Landlock for strict filesystem controls and seccomp for syscall-based network blocking—ensuring that agents can only write to user-approved directories and have no outgoing network by default.
Recent articles
- Publishing WASM wheels to PyPI for use with Pyodide - 13th June 2026
- Claude Fable is relentlessly proactive - 11th June 2026
- Initial impressions of Claude Fable 5 - 9th June 2026