March 2026 monthly summary for repositories openai/codex and zed-industries/codex. Delivered key macOS automation and sandbox security enhancements, improving developer productivity and user data protection. Implemented cross-repo features with tests to validate security boundaries across two macOS-focused modules.

February 2026 monthly summary for openai/codex: Security hardening and policy enforcement on macOS path reads. Implemented macOS Read Access Policy Enhancement: policy-based constraints restricting read access to system paths with platform-specific defaults to ensure macOS apps operate securely while preventing unauthorized access to sensitive system files. Resolved a critical issue by fixing overly-permissive read access for /System (commit 1946a4c48b91f9d0505c2bc2ddf7a27c4078ba1b) (#11798). Result: reduced attack surface, improved defense-in-depth, and better alignment with security controls. This work demonstrates expertise in policy-based access control, macOS security hardening, and maintainable change traceability.