wmf is right in saying this is early days and we're still experimenting. However there is a roughly up to date wire spec here: https://docs.google.com/a/google

wmf is right in saying this is early days and we're still experimenting. However there is a roughly up to date wire spec here: https://docs.google.com/a/google.com/document/d/1WJvyZflAO2pq77yOLbp9NsGjC1CHetAXV8I0fQe-B_U/edit https://docs.google.com/a/google.com/document/d/1WJvyZflAO2p... and a much more detailed design doc here: https://docs.google.com/document/d/1RNHkx_VvKWyWg6Lr8SZ-saqsQx7rFV-ev2jRFUoVD34/preview?sle=true https://docs.google.com/document/d/1RNHkx_VvKWyWg6Lr8SZ-saqs...