proto-proxy reads a google.protobuf.FileDescriptorSet from STDIN and
outputs the Proxyman
configuration to STDOUT, allowing you to easily proxy protobuf-encoded requests
and responses.
You can then import the generated config file into Proxyman via Tools > Protobuf > More > Import Settings....
A .desc file is an encoded google.protobuf.FileDescriptorSet message.
If you're using buf you can generate one with buf build --as-file-descriptor-set -o -.
If you're using protoc the --descriptor_set_in and --descriptor_set_out
flags will be what you're looking for!