During December 2025, this developer updated the Polygon Amoy Testnet network configuration in the coinbase/agentkit repository, focusing on renaming and updating API URLs to align with recent changes in the testnet environment. The work involved synchronizing network definitions across both Python and TypeScript codebases, specifically updating chain_definitions.py and the TypeScript network configuration to ensure consistency. By correcting Mumbai references and maintaining detailed changelog and changeset entries, the developer improved testnet reliability and streamlined onboarding for developers integrating with Polygon. Their contributions leveraged skills in API integration, full stack development, and network configuration, emphasizing accuracy and maintainability in cross-language environments.