During November 2025, Max Belgeo focused on improving API clarity and migration readiness in the vercel/ai repository. He delivered a feature that renamed the chat.addToolResult() method to chat.addToolOutput(), aiming to reduce ambiguity in tool output handling for chat interactions. Using TypeScript and React, Max ensured backward compatibility by deprecating the old method, updating related tests, and providing comprehensive documentation and migration guidance. He also developed a codemod to automate the transition for users. While no bugs were fixed, this work enhanced the developer experience and laid a foundation for more robust tool integrations in future releases.