Prashant Singh enhanced the apache/iceberg planning workflow by enforcing a mandatory plan-id across planning requests and responses, addressing data integrity and API consistency concerns. He implemented spec-driven constraints to ensure that all planning operations include a valid plan-id, reducing the risk of incomplete or invalid data entering downstream systems. Working primarily in Python and YAML, Prashant focused on backend development, data modeling, and data validation to align REST API behavior with updated contract requirements. This work improved traceability and eligibility checks within the planning pipeline, demonstrating a methodical approach to evolving system reliability through targeted, contract-driven engineering changes.