diff --git a/sdk/python/scripts/update_sdk_artifacts.py b/sdk/python/scripts/update_sdk_artifacts.py
index 10ae4d2db5..5dde099c39 100755
--- a/sdk/python/scripts/update_sdk_artifacts.py
+++ b/sdk/python/scripts/update_sdk_artifacts.py
@@ -35,10 +35,12 @@ def python_runtime_root() -> Path:
 
 
 def sdk_pyproject_path() -> Path:
+    """Return the SDK pyproject file that owns package pins and versions."""
     return sdk_root() / "pyproject.toml"
 
 
 def schema_bundle_path(schema_dir: Path) -> Path:
+    """Return the aggregate v2 schema bundle emitted by the runtime binary."""
     return schema_dir / "codex_app_server_protocol.v2.schemas.json"
 
 
@@ -82,6 +84,7 @@ def current_sdk_version() -> str:
 
 
 def pinned_runtime_version() -> str:
+    """Read the exact runtime package pin used for schema generation."""
     pyproject_text = sdk_pyproject_path().read_text()
     match = re.search(r"(?ms)^dependencies = \[(.*?)\]$", pyproject_text)
     if match is None:
@@ -102,6 +105,7 @@ def pinned_runtime_version() -> str:
 
 
 def pinned_runtime_codex_path() -> Path:
+    """Return the bundled Codex binary from the installed pinned runtime wheel."""
     expected_version = pinned_runtime_version()
     try:
         installed_version = importlib.metadata.version(RUNTIME_DISTRIBUTION_NAME)
@@ -534,6 +538,7 @@ def _annotate_schema(value: Any, base: str | None = None) -> None:
 
 
 def generate_schema_from_pinned_runtime(schema_dir: Path) -> Path:
+    """Generate app-server schemas by invoking the installed pinned runtime binary."""
     codex_path = pinned_runtime_codex_path()
     if schema_dir.exists():
         shutil.rmtree(schema_dir)
@@ -552,6 +557,7 @@ def generate_schema_from_pinned_runtime(schema_dir: Path) -> Path:
 
 
 def _normalized_schema_bundle_text(schema_dir: Path) -> str:
+    """Normalize the schema bundle before feeding it to the Python type generator."""
     schema = json.loads(schema_bundle_path(schema_dir).read_text())
     definitions = schema.get("definitions", {})
     if isinstance(definitions, dict):
@@ -565,6 +571,7 @@ def _normalized_schema_bundle_text(schema_dir: Path) -> str:
 
 
 def generate_v2_all(schema_dir: Path) -> None:
+    """Regenerate the Pydantic v2 protocol model module from runtime schemas."""
     out_path = sdk_root() / "src" / "codex_app_server" / "generated" / "v2_all.py"
     out_dir = out_path.parent
     old_package_dir = out_dir / "v2_all"
@@ -611,6 +618,7 @@ def generate_v2_all(schema_dir: Path) -> None:
 
 
 def _notification_specs(schema_dir: Path) -> list[tuple[str, str]]:
+    """Map each server notification method to its generated payload model class."""
     server_notifications = json.loads(
         (schema_dir / "ServerNotification.json").read_text()
     )
@@ -653,7 +661,7 @@ def _notification_turn_id_specs(
     schema_dir: Path,
     specs: list[tuple[str, str]],
 ) -> tuple[list[str], list[str]]:
-    """Classify generated notification payloads by where the turn id lives."""
+    """Classify notification payloads by where their turn id is carried."""
     server_notifications = json.loads(
         (schema_dir / "ServerNotification.json").read_text()
     )
@@ -690,7 +698,7 @@ def _type_tuple_source(class_names: list[str]) -> str:
 
 
 def generate_notification_registry(schema_dir: Path) -> None:
-    """Regenerate notification models and routing metadata from generated schemas."""
+    """Regenerate notification dispatch metadata from the runtime notification schema."""
     out = (
         sdk_root()
         / "src"
@@ -824,6 +832,7 @@ def _camel_to_snake(name: str) -> str:
 def _load_public_fields(
     module_name: str, class_name: str, *, exclude: set[str] | None = None
 ) -> list[PublicFieldSpec]:
+    """Load generated model fields used to render the ergonomic public methods."""
     exclude = exclude or set()
     if module_name == "codex_app_server.generated.v2_all":
         module = _load_generated_v2_all_module()
@@ -851,6 +860,7 @@ def _load_public_fields(
 
 
 def _load_generated_v2_all_module() -> types.ModuleType:
+    """Import the freshly generated v2_all module without importing package init."""
     module_name = "_codex_app_server_generated_v2_all_for_artifacts"
     sys.modules.pop(module_name, None)
     module_path = sdk_root() / "src" / "codex_app_server" / "generated" / "v2_all.py"
@@ -1072,6 +1082,7 @@ def _render_async_thread_block(
 
 
 def generate_public_api_flat_methods() -> None:
+    """Regenerate the public convenience methods from generated protocol models."""
     src_dir = sdk_root() / "src"
     public_api_path = src_dir / "codex_app_server" / "api.py"
     if not public_api_path.exists():
@@ -1141,6 +1152,7 @@ def generate_public_api_flat_methods() -> None:
 
 
 def generate_types_from_schema_dir(schema_dir: Path) -> None:
+    """Regenerate every SDK artifact derived from an existing schema directory."""
     # v2_all is the authoritative generated surface.
     generate_v2_all(schema_dir)
     generate_notification_registry(schema_dir)
@@ -1148,6 +1160,7 @@ def generate_types_from_schema_dir(schema_dir: Path) -> None:
 
 
 def generate_types() -> None:
+    """Generate schemas from the pinned runtime and then refresh SDK artifacts."""
     with tempfile.TemporaryDirectory(prefix="codex-python-schema-") as td:
         schema_dir = generate_schema_from_pinned_runtime(Path(td) / "schema")
         generate_types_from_schema_dir(schema_dir)
diff --git a/sdk/python/tests/test_artifact_workflow_and_binaries.py b/sdk/python/tests/test_artifact_workflow_and_binaries.py
index ff77d77016..53ea609d3e 100644
--- a/sdk/python/tests/test_artifact_workflow_and_binaries.py
+++ b/sdk/python/tests/test_artifact_workflow_and_binaries.py
@@ -16,6 +16,7 @@ ROOT = Path(__file__).resolve().parents[1]
 
 
 def _load_update_script_module():
+    """Load the maintenance script as a module so tests exercise real helpers."""
     script_path = ROOT / "scripts" / "update_sdk_artifacts.py"
     spec = importlib.util.spec_from_file_location("update_sdk_artifacts", script_path)
     if spec is None or spec.loader is None:
@@ -27,6 +28,7 @@ def _load_update_script_module():
 
 
 def _load_runtime_setup_module():
+    """Load runtime setup without importing the SDK package under test."""
     runtime_setup_path = ROOT / "_runtime_setup.py"
     spec = importlib.util.spec_from_file_location("_runtime_setup", runtime_setup_path)
     if spec is None or spec.loader is None:
@@ -40,11 +42,13 @@ def _load_runtime_setup_module():
 
 
 def test_generation_has_single_maintenance_entrypoint_script() -> None:
+    """Keep artifact workflows routed through one script instead of side entrypoints."""
     scripts = sorted(p.name for p in (ROOT / "scripts").glob("*.py"))
     assert scripts == ["update_sdk_artifacts.py"]
 
 
 def test_generate_types_wires_all_generation_steps() -> None:
+    """The type generation command should refresh every schema-derived artifact."""
     source = (ROOT / "scripts" / "update_sdk_artifacts.py").read_text()
     tree = ast.parse(source)
 
@@ -74,6 +78,7 @@ def test_generate_types_wires_all_generation_steps() -> None:
 
 
 def _load_runtime_schema_bundle(tmp_path: Path) -> dict:
+    """Ask the pinned runtime package for a real schema bundle used by tests."""
     script = _load_update_script_module()
     schema_dir = script.generate_schema_from_pinned_runtime(tmp_path / "schema")
     return json.loads(script.schema_bundle_path(schema_dir).read_text())
@@ -82,6 +87,7 @@ def _load_runtime_schema_bundle(tmp_path: Path) -> dict:
 def test_schema_normalization_only_flattens_string_literal_oneofs(
     tmp_path: Path,
 ) -> None:
+    """Schema normalization should only flatten the enum-shaped oneOf variants."""
     script = _load_update_script_module()
     schema = _load_runtime_schema_bundle(tmp_path)
     definitions = schema["definitions"]
@@ -107,6 +113,7 @@ def test_schema_normalization_only_flattens_string_literal_oneofs(
 def test_python_codegen_schema_annotation_adds_stable_variant_titles(
     tmp_path: Path,
 ) -> None:
+    """Schema annotations should give generated protocol classes stable names."""
     script = _load_update_script_module()
     schema = _load_runtime_schema_bundle(tmp_path)
     script._annotate_schema(schema)
diff --git a/sdk/python/tests/test_client_rpc_methods.py b/sdk/python/tests/test_client_rpc_methods.py
index 7dc5ad4d86..b202224080 100644
--- a/sdk/python/tests/test_client_rpc_methods.py
+++ b/sdk/python/tests/test_client_rpc_methods.py
@@ -50,6 +50,7 @@ def test_generated_v2_bundle_has_single_shared_plan_type_definition() -> None:
 
 
 def test_thread_resume_response_accepts_auto_review_reviewer() -> None:
+    """Generated response models should keep accepting the auto review enum value."""
     response = ThreadResumeResponse.model_validate(
         {
             "approvalPolicy": "on-request",
@@ -66,6 +67,7 @@ def test_thread_resume_response_accepts_auto_review_reviewer() -> None:
                 "id": "thread-1",
                 "modelProvider": "openai",
                 "preview": "",
+                # The pinned runtime schema requires the session id on threads.
                 "sessionId": "session-1",
                 "source": "cli",
                 "status": {"type": "idle"},
diff --git a/sdk/python/tests/test_contract_generation.py b/sdk/python/tests/test_contract_generation.py
index f01b58c884..bf105cfd4d 100644
--- a/sdk/python/tests/test_contract_generation.py
+++ b/sdk/python/tests/test_contract_generation.py
@@ -15,6 +15,7 @@ GENERATED_TARGETS = [
 
 
 def _snapshot_target(root: Path, rel_path: Path) -> dict[str, bytes] | bytes | None:
+    """Capture one generated artifact so regeneration drift is easy to compare."""
     target = root / rel_path
     if not target.exists():
         return None
@@ -29,6 +30,7 @@ def _snapshot_target(root: Path, rel_path: Path) -> dict[str, bytes] | bytes | N
 
 
 def _snapshot_targets(root: Path) -> dict[str, dict[str, bytes] | bytes | None]:
+    """Capture all checked-in generated artifacts before and after regeneration."""
     return {
         str(rel_path): _snapshot_target(root, rel_path)
         for rel_path in GENERATED_TARGETS
@@ -36,6 +38,7 @@ def _snapshot_targets(root: Path) -> dict[str, dict[str, bytes] | bytes | None]:
 
 
 def test_generated_files_are_up_to_date():
+    """Regenerating from the pinned runtime package should leave artifacts unchanged."""
     before = _snapshot_targets(ROOT)
 
     # Regenerate contract artifacts via the pinned runtime package, not a local
diff --git a/sdk/python/tests/test_public_api_runtime_behavior.py b/sdk/python/tests/test_public_api_runtime_behavior.py
index 58b8ad43fe..d4f527ddd8 100644
--- a/sdk/python/tests/test_public_api_runtime_behavior.py
+++ b/sdk/python/tests/test_public_api_runtime_behavior.py
@@ -82,6 +82,7 @@ def _item_completed_notification(
     text: str = "final text",
     phase: MessagePhase | None = None,
 ) -> Notification:
+    """Build a realistic completed-item notification accepted by generated models."""
     item: dict[str, object] = {
         "id": "item-1",
         "text": text,
@@ -93,6 +94,7 @@ def _item_completed_notification(
         method="item/completed",
         payload=ItemCompletedNotification.model_validate(
             {
+                # The pinned runtime schema requires completion timestamps.
                 "completedAtMs": 1,
                 "item": item,
                 "threadId": thread_id,
diff --git a/sdk/python/tests/test_public_api_signatures.py b/sdk/python/tests/test_public_api_signatures.py
index e72160e169..ddbcba0675 100644
--- a/sdk/python/tests/test_public_api_signatures.py
+++ b/sdk/python/tests/test_public_api_signatures.py
@@ -54,6 +54,7 @@ def test_package_includes_py_typed_marker() -> None:
 
 
 def test_generated_public_signatures_are_snake_case_and_typed() -> None:
+    """Generated convenience methods should expose typed Pythonic keyword names."""
     expected = {
         Codex.thread_start: [
             "approval_policy",