diff --git a/ado/cli/resources/discovery_space/template.py b/ado/cli/resources/discovery_space/template.py
index b87bebb00..0ff7bd39e 100644
--- a/ado/cli/resources/discovery_space/template.py
+++ b/ado/cli/resources/discovery_space/template.py
@@ -53,6 +53,8 @@ def template_discovery_space(parameters: AdoTemplateCommandParameters) -> None:
     serialise_pydantic_model(
         model=model_instance,
         output_path=parameters.output_file,
+        exclude_none=True,
+        context={"minimize_output": True},
     )
 
     if parameters.include_schema:
diff --git a/ado/cli/utils/pydantic/serializers.py b/ado/cli/utils/pydantic/serializers.py
index c4257485d..cc789c4df 100644
--- a/ado/cli/utils/pydantic/serializers.py
+++ b/ado/cli/utils/pydantic/serializers.py
@@ -13,10 +13,20 @@ def serialise_pydantic_model(
     model: pydantic.BaseModel,
     output_path: Path | None,
     suppress_success_message: bool = False,
+    context: dict | None = None,
+    exclude_none: bool = False,
+    exclude_unset: bool = False,
+    exclude_defaults: bool = False,
 ) -> None:
     from ado.utilities.output import pydantic_model_as_yaml
 
-    yaml_content = pydantic_model_as_yaml(model)
+    yaml_content = pydantic_model_as_yaml(
+        model,
+        exclude_none=exclude_none,
+        exclude_unset=exclude_unset,
+        exclude_defaults=exclude_defaults,
+        context=context,
+    )
 
     if output_path is None:
         # Write to stdout
diff --git a/tests/ado/template/test_ado_template_space.py b/tests/ado/template/test_ado_template_space.py
index fd1a88987..b204b9c4f 100644
--- a/tests/ado/template/test_ado_template_space.py
+++ b/tests/ado/template/test_ado_template_space.py
@@ -115,3 +115,41 @@ def test_template_space_from_experiment_with_actuator_prefix(
         == "peptide_mineralization"
     )
     assert space_configuration.experiments[0].actuatorIdentifier == "robotic_lab"
+
+
+def test_template_space_from_experiment_minified_domains(
+    tmp_path: pathlib.Path, random_identifier: Callable[[], str]
+) -> None:
+    """Template output omits variableType and null fields from each property domain."""
+    runner = CliRunner()
+    file_name = tmp_path / random_identifier()
+    result = runner.invoke(
+        ado,
+        [
+            "template",
+            "space",
+            "--from-experiment",
+            "peptide_mineralization",
+            "--output-file",
+            file_name,
+        ],
+    )
+    assert result.exit_code == 0
+
+    raw = yaml.safe_load(file_name.read_text())
+    for prop_entry in raw.get("entitySpace", []):
+        prop_name = prop_entry.get("identifier", "<unknown>")
+        domain_dict = prop_entry.get("propertyDomain", {})
+        assert "variableType" not in domain_dict, (
+            f"variableType should be absent from {prop_name!r} in template output"
+        )
+        assert (
+            "domainRange" not in domain_dict or domain_dict["domainRange"] is not None
+        ), f"domainRange should be absent (or non-null) in {prop_name!r}"
+        assert "interval" not in domain_dict or domain_dict["interval"] is not None, (
+            f"interval should be absent (or non-null) in {prop_name!r}"
+        )
+        prob_fn = domain_dict.get("probabilityFunction", {})
+        assert "parameters" not in prob_fn or prob_fn["parameters"] is not None, (
+            f"probabilityFunction.parameters should be absent (or non-null) in {prop_name!r}"
+        )