Developed user-scoped persistent volume claim (PVC) data handling for the sandbox provisioner in the bytedance/deer-flow repository, enabling per-user data isolation by incorporating user IDs into PVC sub-paths. This approach enhanced multi-tenant security and data governance by reducing the risk of data leakage between users. The work involved backend development and API design using Python, with integration into Kubernetes environments. Unit tests were updated to validate the new user-scoped behavior while ensuring existing functionality remained intact. Addressed code review feedback through targeted changes, laying the foundation for finer-grained access controls in future multi-tenant deployments and improving overall security posture.