During October 2025, Hoikoo Han enhanced agent configuration validation in the lablup/backend.ai repository by integrating Pydantic into the backend. This work focused on refactoring the existing validation logic to introduce stronger type safety and more granular error reporting, leveraging Python and configuration management best practices. By implementing new validation contexts and custom field validators, Hoikoo ensured that configuration files are checked for correctness across a variety of scenarios, reducing the risk of runtime errors. The changes improved the robustness of configuration loading and established a foundation for broader validation strategies, reflecting a thoughtful and technically sound engineering approach.