In September 2025, delivered scalable batched evaluation capabilities across cedar-policy/cedar-spec and cedar, with formal proofs, type refinements, and robust tests, enabling on-demand entity loading and improved reliability for large-scale authorization. Key changes include batched evaluation correctness proofs, EntityLoader refinements, removal of absent-case handling for partial entities, and a clearer internal type vocabulary. These workstreams reduce runtime errors, improve performance on large datasets, and align code with business goals of reliability, scalability, and maintainability.

August 2025 — Cedar-spec: delivered key architectural and performance improvements to the Policy Engine Evaluation, with batch loading and formal verification to ensure residual well-typedness. Focused on measurable business value and reliability; no major bugs fixed this month as the emphasis was on delivering robust features and solidifying the evaluation path. The work lays groundwork for faster policy evaluations and safer policy language evolution.