Here's the plan:

I'll finalize the "Output Only" docstring formatting for the Dataset.

1.  I will change the "Output Only" annotation to "Output only. " (no brackets, with a period) for all relevant properties in the Dataset class.
2.  I will ensure this annotation is consistently placed at the beginning of the docstring, after the type hint.
3.  I will verify that the note in `Dataset.__init__` regarding server-populated fields and `Client.get_dataset()` is present and correctly formatted.
4.  I will ensure helper attributes `_PROPERTY_TO_API_FIELD` and `_READ_ONLY_PROPERTIES` are correctly populated with all "Output Only" fields.

This will address all requested formatting adjustments for clarity and consistency with API documentation.

Author: google-labs-jules[bot]

google/cloud/bigquery/dataset.py

@@ -574,6 +574,10 @@ class Dataset(object):
             A pointer to a dataset. If ``dataset_ref`` is a string, it must
             include both the project ID and the dataset ID, separated by
             ``.``.
+
+    Note:
+        Fields marked as "Output Only" are populated by the server and will only be
+        available after calling :meth:`google.cloud.bigquery.client.Client.get_dataset`.
     """
 
     _PROPERTY_TO_API_FIELD = {
@@ -692,7 +696,7 @@ def access_entries(self, value):
 
     @property
     def created(self):
-        """Union[datetime.datetime, None]: Datetime at which the dataset was
+        """Union[datetime.datetime, None]: Output only. Datetime at which the dataset was
         created (:data:`None` until set from the server).
         """
         creation_time = self._properties.get("creationTime")
@@ -709,8 +713,8 @@ def dataset_id(self):
 
     @property
     def full_dataset_id(self):
-        """Union[str, None]: ID for the dataset resource (:data:`None` until
-        set from the server)
+        """Union[str, None]: Output only. ID for the dataset resource
+        (:data:`None` until set from the server).
 
         In the format ``project_id:dataset_id``.
         """
@@ -725,14 +729,14 @@ def reference(self):
 
     @property
     def etag(self):
-        """Union[str, None]: ETag for the dataset resource (:data:`None` until
-        set from the server).
+        """Union[str, None]: Output only. ETag for the dataset resource
+        (:data:`None` until set from the server).
         """
         return self._properties.get("etag")
 
     @property
     def modified(self):
-        """Union[datetime.datetime, None]: Datetime at which the dataset was
+        """Union[datetime.datetime, None]: Output only. Datetime at which the dataset was
         last modified (:data:`None` until set from the server).
         """
         modified_time = self._properties.get("lastModifiedTime")
@@ -744,8 +748,8 @@ def modified(self):
 
     @property
     def self_link(self):
-        """Union[str, None]: URL for the dataset resource (:data:`None` until
-        set from the server).
+        """Union[str, None]: Output only. URL for the dataset resource
+        (:data:`None` until set from the server).
         """
         return self._properties.get("selfLink")