diff --git a/src/__tests__/features/opds/useOfflineLibraryState.test.tsx b/src/__tests__/features/opds/useOfflineLibraryState.test.tsx
new file mode 100644
index 0000000..63e7cba
--- /dev/null
+++ b/src/__tests__/features/opds/useOfflineLibraryState.test.tsx
@@ -0,0 +1,186 @@
+import { QueryClient, QueryClientProvider } from "@tanstack/react-query";
+import { act, renderHook, waitFor } from "@testing-library/react";
+import type { ReactNode } from "react";
+import { afterEach, beforeEach, describe, expect, it, vi } from "vitest";
+import { useOfflineLibraryState } from "@/features/opds/useOfflineLibraryState";
+import { offlineLibraryClient } from "@/services/offlineLibrary";
+import type {
+  CategorizedLibraryRecord,
+  OfflineLibrarySnapshot,
+  OfflineRefreshReport,
+} from "@/types/offline";
+import { notifyOpdsError } from "@/utils/notifyOpdsError";
+
+vi.mock("@/services/offlineLibrary", () => ({
+  offlineLibraryClient: {
+    list: vi.fn(),
+    refresh: vi.fn(),
+    deleteContent: vi.fn(),
+    checkDiskSpace: vi.fn(),
+  },
+  isTauriLibraryAvailable: vi.fn(() => true),
+}));
+
+vi.mock("@/utils/tauri", () => ({
+  isTauri: vi.fn(() => true),
+  safeInvoke: vi.fn().mockResolvedValue(null),
+}));
+
+vi.mock("@/utils/notifyOpdsError", () => ({
+  formatOpdsErrorMessage: vi.fn((error: unknown, fallback = "Unknown error") =>
+    error instanceof Error && error.message ? error.message : fallback,
+  ),
+  notifyOpdsError: vi.fn(),
+}));
+
+const mockList = vi.mocked(offlineLibraryClient.list);
+const mockRefresh = vi.mocked(offlineLibraryClient.refresh);
+const mockDeleteContent = vi.mocked(offlineLibraryClient.deleteContent);
+const mockNotify = vi.mocked(notifyOpdsError);
+
+const CATALOG_URL = "https://example.com/opds";
+
+const refreshReport: OfflineRefreshReport = {
+  added: [],
+  changed: [],
+  removed: [],
+  publications_seen: 1,
+  pages_visited: 1,
+  truncated: false,
+};
+
+const baseRecord = {
+  publication_id: 1,
+  account_id: 1,
+  provider: "grimmory",
+  canonical_id: "book-1",
+  metadata_json: "{}",
+  publication_available: true,
+  acquisition_id: 1,
+  media_type: "application/epub+zip",
+  canonical_url: "https://example.com/download/book-1.epub",
+  revision_id: 11,
+  is_current_revision: true,
+  local_relative_path: "Dune.epub",
+  expected_length: null,
+  job_state: "completed" as const,
+  job_error: null,
+  updated_at: 0,
+};
+
+const snapshot: OfflineLibrarySnapshot = {
+  complete: [baseRecord],
+  downloading: [],
+  failed: [],
+  unavailable: [],
+  superseded: [],
+};
+
+const record: CategorizedLibraryRecord = { ...baseRecord, section: "complete" };
+
+function renderOfflineState() {
+  const queryClient = new QueryClient();
+  const wrapper = ({ children }: { children: ReactNode }) => (
+    <QueryClientProvider client={queryClient}>{children}</QueryClientProvider>
+  );
+
+  return renderHook(
+    () =>
+      useOfflineLibraryState({
+        connected: true,
+        catalogUrl: CATALOG_URL,
+        username: "alice",
+        password: "secret",
+      }),
+    { wrapper },
+  );
+}
+
+beforeEach(() => {
+  vi.clearAllMocks();
+  mockList.mockResolvedValue(snapshot);
+});
+
+afterEach(() => {
+  vi.restoreAllMocks();
+});
+
+describe("useOfflineLibraryState", () => {
+  describe("handleRefreshLibrary", () => {
+    it("returns null and surfaces the failure through notifyOpdsError on error", async () => {
+      mockRefresh.mockRejectedValue(new Error("Catalog unreachable"));
+
+      const { result } = renderOfflineState();
+      await waitFor(() => {
+        expect(mockList).toHaveBeenCalledTimes(1);
+      });
+
+      await act(async () => {
+        const report = await result.current.handleRefreshLibrary();
+        expect(report).toBeNull();
+      });
+
+      expect(mockNotify).toHaveBeenCalledTimes(1);
+      expect(mockNotify).toHaveBeenCalledWith(
+        expect.objectContaining({ message: "Catalog unreachable" }),
+        { context: "Catalog refresh", fallback: "Failed to refresh the offline library" },
+      );
+    });
+
+    it("returns the report and does not toast when refresh succeeds", async () => {
+      mockRefresh.mockResolvedValue(refreshReport);
+
+      const { result } = renderOfflineState();
+      await waitFor(() => {
+        expect(mockList).toHaveBeenCalledTimes(1);
+      });
+
+      await act(async () => {
+        const report = await result.current.handleRefreshLibrary();
+        expect(report).toEqual(refreshReport);
+      });
+
+      expect(mockNotify).not.toHaveBeenCalled();
+      expect(mockList).toHaveBeenCalledTimes(2);
+    });
+  });
+
+  describe("handleDeleteLocal", () => {
+    it("surfaces the failure through notifyOpdsError and keeps the record visible", async () => {
+      mockDeleteContent.mockRejectedValue(new Error("Permission denied"));
+
+      const { result } = renderOfflineState();
+      await waitFor(() => {
+        expect(mockList).toHaveBeenCalledTimes(1);
+      });
+
+      await act(async () => {
+        await result.current.handleDeleteLocal("book-1", record);
+      });
+
+      expect(mockNotify).toHaveBeenCalledTimes(1);
+      expect(mockNotify).toHaveBeenCalledWith(
+        expect.objectContaining({ message: "Permission denied" }),
+        { context: "Offline library", fallback: "Failed to delete the local copy" },
+      );
+      expect(mockList).toHaveBeenCalledTimes(1);
+      expect(result.current.libraryInfoByPublicationId["book-1"]?.primary?.revision_id).toBe(11);
+    });
+
+    it("does not toast when deletion succeeds", async () => {
+      mockDeleteContent.mockResolvedValue({ revision_id: 11, deleted_file: true });
+
+      const { result } = renderOfflineState();
+      await waitFor(() => {
+        expect(mockList).toHaveBeenCalledTimes(1);
+      });
+
+      await act(async () => {
+        await result.current.handleDeleteLocal("book-1", record);
+      });
+
+      expect(mockNotify).not.toHaveBeenCalled();
+      expect(mockList).toHaveBeenCalledTimes(2);
+    });
+  });
+});
diff --git a/src/features/opds/useOfflineLibraryState.ts b/src/features/opds/useOfflineLibraryState.ts
index d753d1e..5764fcb 100644
--- a/src/features/opds/useOfflineLibraryState.ts
+++ b/src/features/opds/useOfflineLibraryState.ts
@@ -7,6 +7,7 @@ import type {
   PublicationLibraryInfo,
 } from "@/types/offline";
 import { buildPublicationLibraryInfo } from "@/types/offline";
+import { notifyOpdsError } from "@/utils/notifyOpdsError";
 import { isTauri } from "@/utils/tauri";
 
 export interface UseOfflineLibraryStateParams {
@@ -55,7 +56,11 @@ export function useOfflineLibraryState({
       try {
         await offlineLibraryClient.deleteContent(record.revision_id);
         await refreshLibrarySnapshot();
-      } catch {
+      } catch (error) {
+        notifyOpdsError(error, {
+          context: "Offline library",
+          fallback: "Failed to delete the local copy",
+        });
         // Keep the record visible on failure so the user can retry deletion.
       } finally {
         setDeletingRevisionId(null);
@@ -75,7 +80,11 @@ export function useOfflineLibraryState({
       await queryClient.invalidateQueries({ queryKey: ["opds", "catalog", catalogUrl] });
       await refreshLibrarySnapshot();
       return report;
-    } catch {
+    } catch (error) {
+      notifyOpdsError(error, {
+        context: "Catalog refresh",
+        fallback: "Failed to refresh the offline library",
+      });
       return null;
     }
   }, [catalogUrl, password, queryClient, refreshLibrarySnapshot, username]);