diff --git a/src/tooling/essc/Commands/ContentTypesCommand.cs b/src/tooling/essc/Commands/ContentTypesCommand.cs
index 684ac52c3..737a1d5a1 100644
--- a/src/tooling/essc/Commands/ContentTypesCommand.cs
+++ b/src/tooling/essc/Commands/ContentTypesCommand.cs
@@ -51,6 +51,7 @@ public async Task Types(
 				AnsiConsole.MarkupLine("[green]Survey already complete.[/] Use [yellow]--force[/] to re-run.");
 				AnsiConsole.WriteLine();
 				DisplayResults(state);
+				ExitIfUnregistered(state);
 				return;
 			}
 
@@ -110,6 +111,34 @@ await AnsiConsole.Progress()
 
 		AnsiConsole.WriteLine();
 		DisplayResults(state);
+		ExitIfUnregistered(state);
+	}
+
+	/// <summary>
+	/// Every discovered content type must be explicitly registered as synced (<see cref="PageContentTypes.All"/>),
+	/// intentionally ignored for now (<see cref="PageContentTypes.Blocked"/>), or a non-page component/taxonomy
+	/// type that will never be synced (<see cref="PageContentTypes.KnownNonPages"/>). Fail the run so newly-added
+	/// Contentstack content types can't silently go unclassified.
+	/// </summary>
+	private static void ExitIfUnregistered(ContentTypesState state)
+	{
+		var unregistered = state.ContentTypes.Keys
+			.Where(uid => !PageContentTypes.All.Contains(uid)
+				&& !PageContentTypes.Blocked.Contains(uid)
+				&& !PageContentTypes.KnownNonPages.Contains(uid))
+			.OrderBy(uid => uid, StringComparer.Ordinal)
+			.ToList();
+
+		if (unregistered.Count == 0)
+			return;
+
+		AnsiConsole.WriteLine();
+		AnsiConsole.MarkupLine(
+			$"[red bold]{unregistered.Count} unregistered content type(s) found:[/] {Markup.Escape(string.Join(", ", unregistered))}");
+		AnsiConsole.MarkupLine(
+			"[red]Add each to PageContentTypes.All (to sync it), PageContentTypes.Blocked (to ignore it for now), " +
+			"or PageContentTypes.KnownNonPages (if it's a component/taxonomy type, not a page).[/]");
+		Environment.Exit(1);
 	}
 
 	private static void ProcessPage(ContentTypesState state, SyncResponse response)
@@ -150,6 +179,7 @@ private static void DisplayResults(ContentTypesState state)
 			.AddColumn("[aqua]Content Type UID[/]")
 			.AddColumn(new TableColumn("[aqua]Entries[/]").RightAligned())
 			.AddColumn(new TableColumn("[aqua]Has URL[/]").Centered())
+			.AddColumn(new TableColumn("[aqua]Status[/]").Centered())
 			.AddColumn("[aqua]Sample URLs[/]");
 
 		foreach (var info in groups)
@@ -161,6 +191,14 @@ private static void DisplayResults(ContentTypesState state)
 				_ => $"[yellow]{info.WithUrl}[/]/{info.Total}"
 			};
 
+			var statusDisplay = info.Uid switch
+			{
+				_ when PageContentTypes.Blocked.Contains(info.Uid) => "[grey]ignored[/]",
+				_ when PageContentTypes.KnownNonPages.Contains(info.Uid) => "[grey]skipped[/]",
+				_ when PageContentTypes.All.Contains(info.Uid) => "[green]synced[/]",
+				_ => "[red bold]unregistered[/]"
+			};
+
 			var samples = info.SampleUrls.Count > 0
 				? string.Join("\n", info.SampleUrls.Select(u => $"[dim]{Markup.Escape(u)}[/]"))
 				: "[grey]—[/]";
@@ -169,6 +207,7 @@ private static void DisplayResults(ContentTypesState state)
 				new Markup(Markup.Escape(info.Uid)),
 				new Markup($"[white]{info.Total:N0}[/]"),
 				new Markup(hasUrlDisplay),
+				new Markup(statusDisplay),
 				new Markup(samples)
 			);
 		}
diff --git a/src/tooling/essc/ContentStack/SourcingState.cs b/src/tooling/essc/ContentStack/SourcingState.cs
index 2ee0c3ae3..f8462662f 100644
--- a/src/tooling/essc/ContentStack/SourcingState.cs
+++ b/src/tooling/essc/ContentStack/SourcingState.cs
@@ -127,4 +127,117 @@ internal static class PageContentTypes
 		"events_overview",
 		"blog_archive_overview"
 	];
+
+	/// <summary>
+	/// Content types that exist in Contentstack but must never be synced or indexed — e.g. content
+	/// types still being authored that aren't ready to appear in search yet.
+	/// </summary>
+	public static readonly string[] Blocked =
+	[
+		"blog_landing",
+		"example_link",
+		"examples_landing",
+		"integrations_landing",
+		"labs_integration",
+		"labs_homepage",
+		"notebook",
+		"series",
+		"tutorials_landing",
+		"tutorial",
+		"tutorial_page",
+		"tutorial_chapter",
+		"blog_v3"
+	];
+
+	/// <summary>
+	/// Content types that are never expected to represent a standalone page — reusable components,
+	/// taxonomy/tags, navigation config, redirects, etc. Unlike <see cref="Blocked"/>, these aren't
+	/// candidates for future syncing.
+	/// </summary>
+	public static readonly string[] KnownNonPages =
+	[
+		"Sub_Navigation",
+		"accordion_faq",
+		"accordion_table",
+		"alert_bar",
+		"banner",
+		"blog_categories",
+		"blog_disclaimer",
+		"boilerplate",
+		"callout",
+		"card",
+		"card_carousel",
+		"carousel",
+		"cloud_region_locations",
+		"cloud_regions_service_provider",
+		"code_reference",
+		"column_listing",
+		"contact_languages",
+		"contact_regions",
+		"contact_worldwide_offices",
+		"content_gallery",
+		"content_promos",
+		"contributors",
+		"customer_content_type",
+		"customer_industry",
+		"customer_use_case",
+		"date_field",
+		"featured_split_listing",
+		"features",
+		"footer",
+		"footer_cta",
+		"gdpr_text",
+		"hero",
+		"hero_grid",
+		"image_alternative_text",
+		"image_reference",
+		"image_video",
+		"integration_category",
+		"integration_detail",
+		"integration_solution",
+		"listing_with_sidebar",
+		"logo_bar",
+		"marketo",
+		"marketo_form_split",
+		"meetup_events",
+		"press_contact",
+		"product_names",
+		"quotes",
+		"quotes_carousel",
+		"redirects",
+		"serve_pdfs",
+		"showcase_carousel",
+		"site_navigation_reference",
+		"sitemap_management",
+		"tab_navigation_reference",
+		"table",
+		"tags_audience",
+		"tags_campaigns",
+		"tags_content_type",
+		"tags_culture",
+		"tags_demo_features",
+		"tags_demo_solutions",
+		"tags_demo_type",
+		"tags_elastic_stack",
+		"tags_event_delivery",
+		"tags_event_type",
+		"tags_industry",
+		"tags_language",
+		"tags_meta",
+		"tags_partner",
+		"tags_region",
+		"tags_role",
+		"tags_stage",
+		"tags_teams",
+		"tags_technical_level",
+		"tags_topic",
+		"tags_use_case",
+		"text_image_video",
+		"title_text_reference",
+		"translate_content",
+		"translate_content_redesign",
+		"video_reference",
+		"video_type",
+		"vidyard_reference"
+	];
 }