May 2026 monthly summary for flexcompute/tidy3d focusing on delivering differentiable geometry capabilities, robust testing, and external autograd integration. Work centers on enabling autograd support for clip operations and derivatives of geometry operations (union, difference, intersection, symmetric difference), with precision-tuned gradient calculations and accompanying numerical tests; plus integration with external autograd tooling via derivative helpers and updated numerical structure configuration to enable derivatives with respect to geometry and medium parameters, supported by tests.

2026-04 Monthly Summary for flexcompute/tidy3d. Focused on strengthening simulation integrity, accuracy, and plotting reliability in adjoint workflows. Delivered features that enhance material modeling fidelity, data integrity across adjoint pipelines, and robust visualization for users and downstream pipelines, driving better optimization outcomes and faster issue resolution.

March 2026 performance: Core enhancements to Gaussian beam analysis, improved adjoint postprocessing robustness, and expanded custom gradient/autograd capabilities in tidy3d, enabling more accurate beam propagation modeling, reliable adjoint workflows, and flexible gradient support.

July 2025: Implemented a targeted repository cleanup in flexcompute/tidy3d-notebooks to remove obsolete optimization result .pkl files from autograd notebooks, reducing repository clutter and the potential for confusion. The change focuses on artifact hygiene without altering notebook behavior, contributing to cleaner workflows and reproducibility.