src/cleveragents/application/services/_resource_registry_dag.py

@@ -226,6 +226,41 @@ class ResourceDagMixin:
         finally:
             session.close()
 
+    def get_parents(self: RegistryHost, name_or_id: str) -> list[Resource]:
+        """Get direct parents of a resource.
+
+        Args:
+            name_or_id: Resource name or ULID.
+
+        Returns:
+            List of parent ``Resource`` domain objects, sorted by name.
+
+        Raises:
+            NotFoundError: If the resource does not exist.
+        """
+        resource = self.show_resource(name_or_id)
+        session = self._session()
+        try:
+            links = (
+                session.query(ResourceLinkModel)
+                .filter_by(child_id=resource.resource_id)
+                .all()
+            )
+            parents: list[Resource] = []
+            for link in links:
+                parent_row = (
+                    session.query(ResourceModel)
+                    .filter_by(resource_id=str(link.parent_id))
+                    .first()
+                )
+                if parent_row is not None:
+                    parents.append(db_resource_to_domain(parent_row))
+            # Deterministic ordering: sort by name, then resource_id
+            parents.sort(key=lambda r: (r.name or "", r.resource_id))
+            return parents
+        finally:
+            session.close()
+
     def get_resource_tree(
         self: RegistryHost,
         name_or_id: str,