Worked on the JetBrains/koog repository to address a critical issue in prompt parameter management by delivering a targeted bug fix. Focused on preserving LLMParams fields during the Prompt.withUpdatedParams operation, the solution prevented unintended mutations and ensured that original parameter values remained intact for structured completion requests. This approach improved the reliability and predictability of the prompt management subsystem while minimizing the impact on existing code. Utilized Kotlin for implementation and applied software development best practices, including unit testing, to validate the fix. The work enhanced maintainability and reduced potential downstream failures, contributing to more robust parameter handling in the codebase.