Sergey Simonchik developed migration documentation and interface extensions for the JetBrains/intellij-sdk-docs repository, supporting the transition to the 2025.1 Terminal API. He focused on documenting incompatible API changes and providing clear migration guidance for SDK users, aiming to reduce integration risk for plugin developers. Sergey introduced new abstract methods to the TerminalWidget and TextBufferChangesListener interfaces, enabling seamless integration with the updated API. His work centered on Markdown-based documentation, emphasizing clarity and actionable examples. While the contribution was limited to a single feature over one month, it addressed a critical migration need and improved the overall developer experience for SDK consumers.