This skill should be used when user asks to generate protobuf protocol files from Java .class files or reverse engineer protobuf from compiled bytecode. Activates with phrases like class to protobuf, convert class to proto, generate protobuf from class, reverse engineer protobuf from class, class protobuf conversion, bytecode to protobuf. Provides comprehensive guidance for parsing Java @Protobuf annotations from .class files using javap and generating .proto files.