Developed and released a new StandbyPool API version for the Azure/azure-rest-api-specs repository, introducing Mix VM State support to enhance standby pool capabilities and enable mixed-VM scenarios. The work involved aligning PATCH compatibility across service.tsp and standbyVMPool.tsp, updating Swagger specifications, and ensuring PascalCase naming conventions. JSON and TypeScript were used to update examples, documentation, and release artifacts, including readme and release notes, to improve developer adoption and API consistency. Collaboration was demonstrated through co-authored commits, with careful attention to traceability and documentation. No bugs were fixed during this period, focusing entirely on feature delivery and specification alignment.