The header is fixed as konig-kontext-grpc-context [1]. Does that mean that you can only propagate one gRPC context object? Would it be possible to specify your own header string for the key, and have the interceptors support multiple keys? That sounds safer since the header name could both imply both the serialization and content-type, and Protobuf type_uri, etc. And sounds more useful since developers wouldn't need a catch-all type.
[1] https://github.com/konigsoftware/konig-kontext/blob/84faa627...