Worked on the a2aproject/a2a-python repository to address a critical issue affecting data integrity in protobuf and gRPC workflows. Focused on fixing a bug where protobuf extensions were not properly populated during message serialization and deserialization, which previously led to data omissions in cross-service communications. Utilized Python along with Protocol Buffers and gRPC to implement a solution that ensures all extensions are correctly included in messages, thereby restoring reliable data transfer between services. This work improved downstream system stability and demonstrated a methodical approach to debugging and resolving high-impact issues in distributed systems using modern serialization technologies.