Huihua Zhang developed extensible plugin solutions for the Sifchain/sa-eliza and elizaos-plugins/registry repositories over a two-month period. Huihua built the Apro Plugin for Eliza OS, enabling advanced agent interactions, on-chain data validation, and real-time price queries by integrating live price data APIs and implementing private key management for enhanced security. The work leveraged TypeScript, Node.js, and API integration skills to streamline agent onboarding and ensure data integrity. In the following month, Huihua integrated the APRO ATTPs plugin into the elizaos-plugins/registry, updating configuration and index files to support scalable plugin onboarding and reliable runtime discovery for future extensibility.