During April 2026, Zihan X. enhanced reliability and compatibility across the JetBrains/koog and langchain4j repositories, focusing on backend improvements using Java, Kotlin, and Ktor. He addressed serialization leaks in OpenAI requests by implementing a serializer supporting both camelCase and snake_case, ensuring consistent API integration and reducing production errors. In JetBrains/koog, he improved the Ollama client’s handling of text/plain responses containing JSON, updating content negotiation logic and adding robust unit tests. For langchain4j, he corrected SQL query precedence issues and enabled stateless MCP deployments by exposing session ID management, supporting scalable architectures and more predictable backend behavior.