A response message carries the output data for an API operation. In a gRPC service, define it as a dedicated Protobuf message, even when it currently contains only one field or is empty. section 10.1.1
Dedicated request and response messages preserve version compatibility: later fields such as a user token or habit identifier can be added without breaking clients written against the earlier API. section 10.1.1
CreateHabit response
The CreateHabit endpoint accepts CreateHabitRequest and returns CreateHabitResponse. The response contains a Habit field, leaving room for additional output fields in later versions. section 10.1.1



















