Ilia Brovarnik developed enhanced schema parsing capabilities for the modelcontextprotocol/kotlin-sdk repository, focusing on ToolSchema support for $defs to enable more flexible and accurate schema definitions. Working primarily in Kotlin, Ilia concentrated on backend and API development, ensuring that the new functionality integrated smoothly with existing developer tooling. The approach emphasized maintainability and robust test coverage, with targeted Gradle tests verifying reliability and preventing regressions. By aligning with MCP documentation and coding standards, Ilia maintained a non-breaking change trajectory, improving downstream tooling interoperability and onboarding workflows. The work demonstrated thoughtful engineering depth within a focused, high-impact feature delivery.