openai/codex
Feb 2026 – Mar 2026
2 Months active
Languages Used
Rust
Technical Skills
Rustsecurity policy designsystem programmingautomationmacOS development
Leo Shimonaka
PROFILE
Leo Shimonaka
Leo Shimo developed and enhanced security and automation features for the openai/codex and zed-industries/codex repositories over a two-month period. He implemented policy-based constraints in Rust to restrict macOS system path reads, reducing unauthorized access and aligning with platform security controls. Leo also designed and updated JSON schemas to support new sandbox permissions for Launch Services, Contacts, and Reminders, enabling secure permission management. His work included end-to-end tests to validate automation boundaries and maintain defense-in-depth. By focusing on maintainable, traceable changes and cross-repository consistency, Leo demonstrated depth in system programming, API design, and macOS development throughout these contributions.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
4Total
Bugs
0
Commits
4
Features
3
Lines of code
1,173
Activity Months2
Your Network
700 peopleSame Organization
@openai.com309
Work History
March 2026
3 Commits • 2 Features
Mar 1, 2026March 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.
3 Commits • 2 Features
Mar 1, 2026March 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.
March 2026
February 2026
1 Commits • 1 Features
Feb 1, 2026February 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.
February 2026
1 Commits • 1 Features
Feb 1, 2026February 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.
Activity
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Quality Metrics
Correctness100.0%
Maintainability80.0%
Architecture80.0%
Performance80.0%
AI Usage40.0%
Skills & Technologies
Programming Languages
JSONRust
Technical Skills
API DesignJSON SchemaRustautomationmacOS DevelopmentmacOS developmentsecurity policy designsystem programming
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline
zed-industries/codex
Mar 2026 – Mar 2026
1 Month active
Languages Used
JSONRust
Technical Skills
API DesignJSON SchemaRustmacOS Development