During November 2025, Pet Jahn focused on enhancing the googleapis/python-aiplatform repository by developing targeted tests for Agent Engine identity handling. Pet implemented replay tests to validate the correct creation of agent engines across various identity configurations, specifically ensuring that the identity_type and effective_identity fields functioned as intended. This work improved the overall test coverage and contributed to the project’s CI readiness, supporting more reliable deployments. Utilizing Python and unit testing frameworks, Pet’s contributions addressed the need for robust API development practices. The depth of the work lay in systematically verifying identity validation, which strengthened the reliability of the platform’s agent engine features.