diff --git a/src/features/ReviewHarness/communityReviewTypeProbe.ts b/src/features/ReviewHarness/communityReviewTypeProbe.ts
new file mode 100644
index 00000000..04634e2e
--- /dev/null
+++ b/src/features/ReviewHarness/communityReviewTypeProbe.ts
@@ -0,0 +1,27 @@
+import type { FilePath } from "@vrtmrz/livesync-commonlib/compat/common/types";
+import type { ObsidianLiveSyncSettings } from "@vrtmrz/livesync-commonlib/compat/common/models/setting.type";
+import type { FSWatcher } from "chokidar";
+import type { IDBPDatabase } from "idb";
+import type { TFile } from "obsidian";
+import type { TaggedType } from "octagonal-wheels/common/types";
+import type { SimpleStore } from "octagonal-wheels/databases/SimpleStoreBase";
+
+declare const localTypeTag: unique symbol;
+
+type LocalObject = {
+    readonly value: string;
+};
+
+type LocalTaggedType = string & {
+    readonly [localTypeTag]: "LocalTaggedType";
+};
+
+export type LocalObjectUnionProbe = LocalObject | undefined;
+export type LocalTaggedUnionProbe = LocalTaggedType | undefined;
+export type OctagonalWheelsTaggedUnionProbe = TaggedType<string, "ExternalTaggedType"> | undefined;
+export type CommonlibFilePathUnionProbe = FilePath | undefined;
+export type CommonlibSettingsUnionProbe = ObsidianLiveSyncSettings | undefined;
+export type OctagonalWheelsStoreUnionProbe = SimpleStore<unknown> | undefined;
+export type IndexedDBUnionProbe = IDBPDatabase<unknown> | undefined;
+export type ObsidianFileUnionProbe = TFile | undefined;
+export type ChokidarWatcherUnionProbe = FSWatcher | undefined;