Learn how to improve productivity using Calibre Yield Server, specifically for post layout flows. The Calibre Yield Server command-line interface allows users to query the contents of SVDB files for both topological and geometrical information. The paper highlights the benefits of using Calibre Yield Server for post layout flows and how it can be used to process information from SVDB LVS databases and pass it downstream to PEX and EMIR flows. Additionally, the paper provides a step-by-step guide on how to build a custom API library based on Calibre YS commands, which includes custom functions to retrieve information from Calibre databases and use them in conjunction with the Layout viewer.