Because it doesn't deserialize protocol buffers, but protocol buffer descriptors. Descriptors are serialized protos of this type: https://github.com/google/prot

Because it doesn't deserialize protocol buffers, but protocol buffer descriptors. Descriptors are serialized protos of this type: https://github.com/google/protobuf/blob/master/src/google/protobuf/descriptor.proto https://github.com/google/protobuf/blob/master/src/google/pr... . Each descriptor is a parsed representation of a ".proto" file, including the message names and field names.