Worked on the spring-ai repository to enhance the reliability of the MCP tool input schema by addressing issues with nullable Kotlin properties. Focused on JSON schema generation, the developer implemented a targeted fix ensuring that nullable fields in Kotlin are no longer incorrectly marked as required in the generated schema. This adjustment reduced schema validation errors and improved integration with downstream tools. The work involved validating changes against the MCP input schema generation process, using Java and Kotlin alongside unit testing to ensure correctness. These efforts improved the overall input processing flow and reduced potential friction for developers integrating with spring-ai.