diff --git a/.changeset/delegate-attach-mock-api-factory.md b/.changeset/delegate-attach-mock-api-factory.md
new file mode 100644
index 0000000000..0d1f47bd64
--- /dev/null
+++ b/.changeset/delegate-attach-mock-api-factory.md
@@ -0,0 +1,5 @@
+---
+'@backstage/frontend-test-utils': patch
+---
+
+Removed internal `mockWithApiFactory` helper in favor of using `attachMockApiFactory` directly.
diff --git a/packages/frontend-test-utils/src/apis/MockWithApiFactory.ts b/packages/frontend-test-utils/src/apis/MockWithApiFactory.ts
index 55bb7653e5..28ce01e314 100644
--- a/packages/frontend-test-utils/src/apis/MockWithApiFactory.ts
+++ b/packages/frontend-test-utils/src/apis/MockWithApiFactory.ts
@@ -42,26 +42,6 @@ export type MockWithApiFactory<TApi> = TApi & {
   [mockApiFactorySymbol]: ApiFactory<TApi, TApi, {}>;
 };
 
-/**
- * Helper to attach mock API metadata to an instance.
- *
- * @internal
- */
-export function mockWithApiFactory<TApi, TImpl extends TApi = TApi>(
-  apiRef: ApiRef<TApi>,
-  implementation: TImpl,
-): TImpl & { [mockApiFactorySymbol]: ApiFactory<TApi, TApi, {}> } {
-  const marked = implementation as TImpl & {
-    [mockApiFactorySymbol]: ApiFactory<TApi, TApi, {}>;
-  };
-  (marked as any)[mockApiFactorySymbol] = {
-    api: apiRef,
-    deps: {},
-    factory: () => implementation,
-  };
-  return marked;
-}
-
 /**
  * Attaches mock API factory metadata to an API instance, allowing it to be
  * passed directly to test utilities without needing to explicitly provide
diff --git a/packages/frontend-test-utils/src/apis/mockApis.ts b/packages/frontend-test-utils/src/apis/mockApis.ts
index 96932318bb..99b3ebfb67 100644
--- a/packages/frontend-test-utils/src/apis/mockApis.ts
+++ b/packages/frontend-test-utils/src/apis/mockApis.ts
@@ -54,7 +54,7 @@ import { MockStorageApi } from './StorageApi';
 import { MockPermissionApi } from './PermissionApi';
 import { MockTranslationApi } from './TranslationApi';
 import {
-  mockWithApiFactory,
+  attachMockApiFactory,
   type MockWithApiFactory,
 } from './MockWithApiFactory';
 import { createApiMock } from './createApiMock';
@@ -104,7 +104,7 @@ export namespace mockApis {
    */
   export function alert(): MockWithApiFactory<MockAlertApi> {
     const instance = new MockAlertApi();
-    return mockWithApiFactory(
+    return attachMockApiFactory(
       alertApiRef,
       instance,
     ) as MockWithApiFactory<MockAlertApi>;
@@ -146,7 +146,7 @@ export namespace mockApis {
     initialStates?: Record<string, FeatureFlagState>;
   }): MockWithApiFactory<MockFeatureFlagsApi> {
     const instance = new MockFeatureFlagsApi(options);
-    return mockWithApiFactory(
+    return attachMockApiFactory(
       featureFlagsApiRef,
       instance,
     ) as MockWithApiFactory<MockFeatureFlagsApi>;
@@ -181,7 +181,7 @@ export namespace mockApis {
   export function analytics(): MockAnalyticsApi &
     MockWithApiFactory<AnalyticsApi> {
     const instance = new MockAnalyticsApi();
-    return mockWithApiFactory(analyticsApiRef, instance) as MockAnalyticsApi &
+    return attachMockApiFactory(analyticsApiRef, instance) as MockAnalyticsApi &
       MockWithApiFactory<AnalyticsApi>;
   }
 
@@ -205,7 +205,7 @@ export namespace mockApis {
   export function translation(): MockTranslationApi &
     MockWithApiFactory<TranslationApi> {
     const instance = MockTranslationApi.create();
-    return mockWithApiFactory(
+    return attachMockApiFactory(
       translationApiRef,
       instance,
     ) as MockTranslationApi & MockWithApiFactory<TranslationApi>;
@@ -237,7 +237,7 @@ export namespace mockApis {
     data?: JsonObject;
   }): MockConfigApi & MockWithApiFactory<ConfigApi> {
     const instance = new MockConfigApi({ data: options?.data ?? {} });
-    return mockWithApiFactory(configApiRef, instance) as MockConfigApi &
+    return attachMockApiFactory(configApiRef, instance) as MockConfigApi &
       MockWithApiFactory<ConfigApi>;
   }
 
@@ -281,7 +281,7 @@ export namespace mockApis {
         return `${baseUrl}/api/${pluginId}`;
       },
     };
-    return mockWithApiFactory(discoveryApiRef, instance) as DiscoveryApi &
+    return attachMockApiFactory(discoveryApiRef, instance) as DiscoveryApi &
       MockWithApiFactory<DiscoveryApi>;
   }
 
@@ -329,7 +329,7 @@ export namespace mockApis {
       },
       async signOut() {},
     };
-    return mockWithApiFactory(identityApiRef, instance) as IdentityApi &
+    return attachMockApiFactory(identityApiRef, instance) as IdentityApi &
       MockWithApiFactory<IdentityApi>;
   }
 
@@ -366,8 +366,10 @@ export namespace mockApis {
         ? authorizeInput
         : () => authorizeInput ?? AuthorizeResult.ALLOW;
     const instance = new MockPermissionApi(handler);
-    return mockWithApiFactory(permissionApiRef, instance) as MockPermissionApi &
-      MockWithApiFactory<PermissionApi>;
+    return attachMockApiFactory(
+      permissionApiRef,
+      instance,
+    ) as MockPermissionApi & MockWithApiFactory<PermissionApi>;
   }
 
   /**
@@ -390,7 +392,7 @@ export namespace mockApis {
     data?: JsonObject;
   }): MockStorageApi & MockWithApiFactory<StorageApi> {
     const instance = MockStorageApi.create(options?.data);
-    return mockWithApiFactory(storageApiRef, instance) as MockStorageApi &
+    return attachMockApiFactory(storageApiRef, instance) as MockStorageApi &
       MockWithApiFactory<StorageApi>;
   }
 
@@ -418,7 +420,7 @@ export namespace mockApis {
     collect?: boolean;
   }): MockErrorApi & MockWithApiFactory<ErrorApi> {
     const instance = new MockErrorApi(options);
-    return mockWithApiFactory(errorApiRef, instance) as MockErrorApi &
+    return attachMockApiFactory(errorApiRef, instance) as MockErrorApi &
       MockWithApiFactory<ErrorApi>;
   }
 
@@ -443,7 +445,7 @@ export namespace mockApis {
     options?: MockFetchApiOptions,
   ): MockFetchApi & MockWithApiFactory<FetchApi> {
     const instance = new MockFetchApi(options);
-    return mockWithApiFactory(fetchApiRef, instance) as MockFetchApi &
+    return attachMockApiFactory(fetchApiRef, instance) as MockFetchApi &
       MockWithApiFactory<FetchApi>;
   }