diff --git a/packages/obsidian/src/library/LibraryController.ts b/packages/obsidian/src/library/LibraryController.ts
new file mode 100644
index 0000000..9a83a13
--- /dev/null
+++ b/packages/obsidian/src/library/LibraryController.ts
@@ -0,0 +1,211 @@
+import { Notice, TFile, TFolder } from 'obsidian';
+import { bookSpec } from 'packages/obsidian/src/library/book';
+import { comicSpec } from 'packages/obsidian/src/library/comic';
+import { gameSpec } from 'packages/obsidian/src/library/game';
+import { libraryFolderResolve, libraryFolderSync, type LibraryEngineDeps, type LibraryReport, type LibraryResolveReport } from 'packages/obsidian/src/library/LibraryEngine';
+import { mangaSpec } from 'packages/obsidian/src/library/manga';
+import type { HttpJsonFn, HttpTextFn, MediaTypeSpec, SpecDeps } from 'packages/obsidian/src/library/types';
+import type MediaDbPlugin from 'packages/obsidian/src/main';
+import { obsidianFetch } from 'packages/obsidian/src/utils/Utils';
+import { TmdbRateLimitError } from 'packages/obsidian/src/watchlist/SyncEngine';
+import { shouldNotifySync } from 'packages/obsidian/src/watchlist/WatchlistController';
+
+/** Type <-> command-slug map, used by main.ts to register per-type commands and by the controller to iterate specs. */
+export const LIBRARY_TYPES: readonly { spec: MediaTypeSpec; slug: string }[] = [
+	{ spec: mangaSpec, slug: 'mangas' },
+	{ spec: bookSpec, slug: 'books' },
+	{ spec: gameSpec, slug: 'games' },
+	{ spec: comicSpec, slug: 'comics' },
+];
+
+/** Specs whose enrichment needs a secretStorage-held API key (jikan/mangadex/openlibrary/rss/steam are keyless). */
+const KEY_REQUIREMENT: Partial<Record<MediaTypeSpec['typeName'], 'rawg' | 'comicvine'>> = {
+	game: 'rawg',
+	comic: 'comicvine',
+};
+
+const KEY_LABEL: Record<'rawg' | 'comicvine', string> = {
+	rawg: 'RAWG',
+	comicvine: 'Comic Vine',
+};
+
+function emptyReport(): LibraryReport {
+	return { scanned: 0, synced: 0, written: 0, skippedNoId: 0, skippedStatic: 0, skippedNoData: 0, flipped: [], errors: [] };
+}
+
+function emptyResolveReport(): LibraryResolveReport {
+	return { resolved: [], ambiguous: [], errors: [] };
+}
+
+export class LibraryController {
+	private syncing = false;
+	private specs: MediaTypeSpec[] = LIBRARY_TYPES.map(t => t.spec);
+
+	constructor(private plugin: MediaDbPlugin) {}
+
+	private notify(msg: string): void {
+		new Notice(msg);
+	}
+
+	private getKey(name: 'rawg' | 'comicvine'): string {
+		const keyId = name === 'rawg' ? this.plugin.settings.RAWGAPIKeyId : this.plugin.settings.ComicVineKeyId;
+		const key = keyId ? this.plugin.app.secretStorage.getSecret(keyId) : null;
+		return key ?? '';
+	}
+
+	private folderFor(spec: MediaTypeSpec): string {
+		return (this.plugin.settings as unknown as Record<string, string>)[spec.folderSettingKey];
+	}
+
+	private enabledFor(spec: MediaTypeSpec): boolean {
+		return (this.plugin.settings as unknown as Record<string, boolean>)[spec.enabledSettingKey];
+	}
+
+	// Duplicated (not extracted) from WatchlistController.makeHttp -- watchlist code stays untouched per plan.
+	// Kept minimal + generic (no TMDB-specific wording) since it's shared across all library APIs.
+	private makeHttp(): HttpJsonFn {
+		return async (url: string, headers: Record<string, string>): Promise<any> => {
+			const res = await obsidianFetch(new Request(url, { headers }));
+			if (res.status === 429) {
+				const err = new TmdbRateLimitError(`Library API 429 for ${url}`);
+				const ra = Number(res.headers.get('retry-after'));
+				err.retryAfterMs = Number.isFinite(ra) && ra > 0 ? ra * 1000 : 2000;
+				throw err;
+			}
+			if (res.status !== 200) throw new Error(`Library API ${res.status} for ${url}`);
+			return await res.json();
+		};
+	}
+
+	private makeHttpText(): HttpTextFn {
+		return async (url: string, headers: Record<string, string>): Promise<string> => {
+			const res = await obsidianFetch(new Request(url, { headers }));
+			if (res.status === 429) {
+				const err = new TmdbRateLimitError(`Library API 429 for ${url}`);
+				const ra = Number(res.headers.get('retry-after'));
+				err.retryAfterMs = Number.isFinite(ra) && ra > 0 ? ra * 1000 : 2000;
+				throw err;
+			}
+			if (res.status !== 200) throw new Error(`Library API ${res.status} for ${url}`);
+			return await res.text();
+		};
+	}
+
+	private makeSpecDeps(): SpecDeps {
+		return {
+			http: this.makeHttp(),
+			httpText: this.makeHttpText(),
+			getKey: name => this.getKey(name),
+			log: msg => console.log(`[media-db-library] ${msg}`),
+			notify: msg => this.notify(msg),
+		};
+	}
+
+	private makeDeps(spec: MediaTypeSpec): LibraryEngineDeps {
+		const { app } = this.plugin;
+		const folderPath = this.folderFor(spec);
+		const folder = app.vault.getAbstractFileByPath(folderPath);
+		return {
+			listNotes: async () => {
+				if (!(folder instanceof TFolder)) throw new Error(`Library folder not found: ${folderPath}`);
+				const files = folder.children.filter((f): f is TFile => f instanceof TFile && f.extension === 'md' && !f.name.startsWith('_'));
+				return files.map(f => ({ path: f.path }));
+			},
+			readNote: async path => {
+				const f = app.vault.getAbstractFileByPath(path);
+				if (!(f instanceof TFile)) throw new Error(`Library note not found: ${path}`);
+				return await app.vault.read(f);
+			},
+			writeNote: async (path, content) => {
+				const f = app.vault.getAbstractFileByPath(path);
+				if (f instanceof TFile) await app.vault.modify(f, content);
+			},
+			sleep: ms => new Promise(r => setTimeout(r, ms)),
+			log: msg => console.log(`[media-db-library] ${msg}`),
+			specDeps: this.makeSpecDeps(),
+		};
+	}
+
+	/** Per-note key skipping already happens inside the spec (log+skip); this only surfaces one Notice per sync run naming the affected type. */
+	private warnMissingKey(spec: MediaTypeSpec): void {
+		const req = KEY_REQUIREMENT[spec.typeName];
+		if (!req || this.getKey(req)) return;
+		this.notify(`Library sync: ${KEY_LABEL[req]} API key not configured — ${spec.typeName} enrichment skipped (Media DB Sync settings).`);
+	}
+
+	private async runSync(spec: MediaTypeSpec, full: boolean, dryRun: boolean, quiet: boolean): Promise<LibraryReport> {
+		this.warnMissingKey(spec);
+		const deps = this.makeDeps(spec);
+		const report = await libraryFolderSync(spec, deps, { full, dryRun });
+		const mode = dryRun ? 'DRY-RUN ' : '';
+		if (shouldNotifySync(quiet, report.written, report.errors.length)) {
+			this.notify(
+				`Library ${mode}sync (${spec.typeName}): ${report.synced} checked, ${report.written} updated, ${report.flipped.length} flipped` +
+					(report.errors.length ? `, ${report.errors.length} errors (see console)` : ''),
+			);
+		}
+		return report;
+	}
+
+	async syncType(spec: MediaTypeSpec, full: boolean, dryRun = false, quiet = false): Promise<LibraryReport> {
+		if (this.syncing) {
+			this.notify('Library sync already running');
+			return emptyReport();
+		}
+		this.syncing = true;
+		try {
+			return await this.runSync(spec, full, dryRun, quiet);
+		} finally {
+			this.syncing = false;
+		}
+	}
+
+	async resolveType(spec: MediaTypeSpec, dryRun = false): Promise<LibraryResolveReport> {
+		if (this.syncing) {
+			this.notify('Library sync already running');
+			return emptyResolveReport();
+		}
+		this.syncing = true;
+		try {
+			const deps = this.makeDeps(spec);
+			const report = await libraryFolderResolve(spec, deps, { dryRun });
+			const mode = dryRun ? 'DRY-RUN ' : '';
+			this.notify(
+				`Library ${mode}resolve (${spec.typeName}): ${report.resolved.length} resolved, ${report.ambiguous.length} ambiguous/no match` +
+					(report.errors.length ? `, ${report.errors.length} errors (see console)` : ''),
+			);
+			return report;
+		} finally {
+			this.syncing = false;
+		}
+	}
+
+	async syncAll(full: boolean, quiet = false): Promise<void> {
+		if (this.syncing) {
+			this.notify('Library sync already running');
+			return;
+		}
+		this.syncing = true;
+		try {
+			for (const spec of this.specs) {
+				if (!this.enabledFor(spec)) continue;
+				await this.runSync(spec, full, false, quiet);
+			}
+			if (!full) {
+				this.plugin.settings.libraryLastSync = Date.now();
+				await this.plugin.saveSettings();
+			}
+		} finally {
+			this.syncing = false;
+		}
+	}
+
+	async maybeCatchUp(): Promise<void> {
+		const s = this.plugin.settings;
+		if (!this.specs.some(spec => this.enabledFor(spec))) return;
+		const due = s.libraryLastSync + s.watchlistSyncIntervalHours * 3600_000;
+		if (Date.now() >= due) {
+			await this.syncAll(false, true).catch(e => console.error('[media-db-library] scheduled sync failed', e));
+		}
+	}
+}
diff --git a/packages/obsidian/src/main.ts b/packages/obsidian/src/main.ts
index b80d72d..3c2d6da 100644
--- a/packages/obsidian/src/main.ts
+++ b/packages/obsidian/src/main.ts
@@ -16,6 +16,7 @@ import { TMDBSeasonAPI } from 'packages/obsidian/src/api/apis/TMDBSeasonAPI';
 import { TMDBSeriesAPI } from 'packages/obsidian/src/api/apis/TMDBSeriesAPI';
 import { VNDBAPI } from 'packages/obsidian/src/api/apis/VNDBAPI';
 import { WikipediaAPI } from 'packages/obsidian/src/api/apis/WikipediaAPI';
+import { LibraryController, LIBRARY_TYPES } from 'packages/obsidian/src/library/LibraryController';
 import type { LegacyApiKeyEntry } from 'packages/obsidian/src/modals/LegacyApiKeysModal';
 import { LegacyApiKeysModal } from 'packages/obsidian/src/modals/LegacyApiKeysModal';
 import { PropertyMapper } from 'packages/obsidian/src/settings/PropertyMapper';
@@ -46,6 +47,7 @@ export default class MediaDbPlugin extends Plugin {
 	dateFormatter!: DateFormatter;
 	errorReporter!: ErrorReporter;
 	watchlist!: WatchlistController;
+	library!: LibraryController;
 
 	async onload(): Promise<void> {
 		this.mediaTypeManager = new MediaTypeManager();
@@ -64,10 +66,13 @@ export default class MediaDbPlugin extends Plugin {
 		this.registerCommands();
 
 		this.watchlist = new WatchlistController(this);
-		// catch-up shortly after startup (let vault index settle), then hourly due-check
-		const catchUpTimeout = window.setTimeout(() => void this.watchlist.maybeCatchUp(), 30_000);
+		this.library = new LibraryController(this);
+		// catch-up shortly after startup (let vault index settle), then hourly due-check.
+		// library catch-up runs after watchlist's, sharing the same timers (no new timers).
+		const catchUp = () => void this.watchlist.maybeCatchUp().then(() => this.library.maybeCatchUp());
+		const catchUpTimeout = window.setTimeout(catchUp, 30_000);
 		this.register(() => window.clearTimeout(catchUpTimeout));
-		this.registerInterval(window.setInterval(() => void this.watchlist.maybeCatchUp(), 3600_000));
+		this.registerInterval(window.setInterval(catchUp, 3600_000));
 	}
 
 	onunload(): void {}
@@ -197,6 +202,29 @@ export default class MediaDbPlugin extends Plugin {
 			name: 'Watchlist: resolve missing TMDB ids',
 			callback: () => void this.watchlist.resolveMissingIds().catch((e: unknown) => new Notice(e instanceof Error ? e.message : String(e))),
 		});
+
+		for (const { spec, slug } of LIBRARY_TYPES) {
+			this.addCommand({
+				id: `library-sync-${slug}`,
+				name: `Library: sync ${slug} now`,
+				callback: () => void this.library.syncType(spec, false).catch((e: unknown) => new Notice(e instanceof Error ? e.message : String(e))),
+			});
+			this.addCommand({
+				id: `library-resolve-${slug}`,
+				name: `Library: resolve ${slug} ids`,
+				callback: () => void this.library.resolveType(spec).catch((e: unknown) => new Notice(e instanceof Error ? e.message : String(e))),
+			});
+			this.addCommand({
+				id: `library-dry-run-${slug}`,
+				name: `Library: dry-run ${slug} full sync`,
+				callback: () => void this.library.syncType(spec, true, true).catch((e: unknown) => new Notice(e instanceof Error ? e.message : String(e))),
+			});
+		}
+		this.addCommand({
+			id: 'library-sync-all',
+			name: 'Library: sync all',
+			callback: () => void this.library.syncAll(false).catch((e: unknown) => new Notice(e instanceof Error ? e.message : String(e))),
+		});
 	}
 
 	private getLegacyApiKeyEntries(diskSettings: Record<string, unknown>): LegacyApiKeyEntry[] {
diff --git a/packages/obsidian/src/settings/Settings.ts b/packages/obsidian/src/settings/Settings.ts
index 06554f0..034e93d 100644
--- a/packages/obsidian/src/settings/Settings.ts
+++ b/packages/obsidian/src/settings/Settings.ts
@@ -124,6 +124,16 @@ export interface MediaDbPluginSettings {
 	watchlistSyncIntervalHours: number;
 	watchlistLastSync: number;
 
+	libraryMangaEnabled: boolean;
+	libraryMangaFolder: string;
+	libraryBookEnabled: boolean;
+	libraryBookFolder: string;
+	libraryGameEnabled: boolean;
+	libraryGameFolder: string;
+	libraryComicEnabled: boolean;
+	libraryComicFolder: string;
+	libraryLastSync: number;
+
 	// DEPRECATED: Use propertyMappingModels instead
 	moviePropertyConversionRules: string;
 	seriesPropertyConversionRules: string;
@@ -388,6 +398,16 @@ const DEFAULT_SETTINGS: MediaDbPluginSettings = {
 	watchlistSyncIntervalHours: 24,
 	watchlistLastSync: 0,
 
+	libraryMangaEnabled: false,
+	libraryMangaFolder: 'Mangas',
+	libraryBookEnabled: false,
+	libraryBookFolder: 'Books',
+	libraryGameEnabled: false,
+	libraryGameFolder: 'Games',
+	libraryComicEnabled: false,
+	libraryComicFolder: 'Comics',
+	libraryLastSync: 0,
+
 	// DEPRECATED
 	moviePropertyConversionRules: '',
 	seriesPropertyConversionRules: '',
@@ -791,6 +811,54 @@ export class MediaDbSettingTab extends PluginSettingTab {
 					}),
 		);
 
+		// MARK: Library sync
+		const libraryGroup = new SettingGroup(containerEl);
+		libraryGroup.setHeading('Library sync');
+
+		const libraryTypeSettings: { label: string; enabledKey: keyof MediaDbPluginSettings; folderKey: keyof MediaDbPluginSettings; desc: string }[] = [
+			{ label: 'Manga', enabledKey: 'libraryMangaEnabled', folderKey: 'libraryMangaFolder', desc: 'Jikan (MyAnimeList) + MangaDex/RSS chapter tracking.' },
+			{ label: 'Book', enabledKey: 'libraryBookEnabled', folderKey: 'libraryBookFolder', desc: 'Open Library enrichment.' },
+			{ label: 'Game', enabledKey: 'libraryGameEnabled', folderKey: 'libraryGameFolder', desc: 'Steam + RAWG enrichment. Uses the RAWG API key configured above.' },
+			{ label: 'Comic', enabledKey: 'libraryComicEnabled', folderKey: 'libraryComicFolder', desc: 'Comic Vine enrichment. Uses the Comic Vine API key configured above.' },
+		];
+
+		for (const { label, enabledKey, folderKey, desc } of libraryTypeSettings) {
+			libraryGroup.addSetting(
+				setting =>
+					void setting
+						.setName(`Enable ${label.toLowerCase()} library sync`)
+						.setDesc(`Periodically sync ${label.toLowerCase()} notes against their source APIs. ${desc}`)
+						.addToggle(cb => {
+							cb.setValue(this.plugin.settings[enabledKey] as boolean).onChange(data => {
+								(this.plugin.settings[enabledKey] as boolean) = data;
+								void this.plugin.saveSettings();
+							});
+						}),
+			);
+
+			libraryGroup.addSetting(
+				setting =>
+					void setting
+						.setName(`${label} folder`)
+						.setDesc(`Folder containing ${label.toLowerCase()} notes.`)
+						.addSearch(cb => {
+							const suggester = new FolderSuggest(this.app, cb.inputEl);
+							suggester.onSelect(folder => {
+								cb.setValue(folder.path);
+								(this.plugin.settings[folderKey] as string) = folder.path;
+								void this.plugin.saveSettings();
+								suggester.close();
+							});
+							cb.setPlaceholder(DEFAULT_SETTINGS[folderKey] as string)
+								.setValue(this.plugin.settings[folderKey] as string)
+								.onChange(data => {
+									(this.plugin.settings[folderKey] as string) = data;
+									void this.plugin.saveSettings();
+								});
+						}),
+			);
+		}
+
 		// MARK: Media type settings
 
 		// Create a map to store APIs for each media type
diff --git a/tests/library-controller.test.ts b/tests/library-controller.test.ts
new file mode 100644
index 0000000..8f9cbfa
--- /dev/null
+++ b/tests/library-controller.test.ts
@@ -0,0 +1,237 @@
+import { describe, expect, test } from 'bun:test';
+import { bookSpec } from 'packages/obsidian/src/library/book';
+import { gameSpec } from 'packages/obsidian/src/library/game';
+import { LibraryController } from 'packages/obsidian/src/library/LibraryController';
+import type { LibraryEngineDeps } from 'packages/obsidian/src/library/LibraryEngine';
+import { mangaSpec } from 'packages/obsidian/src/library/manga';
+
+function fakePlugin(
+	overrides: Partial<{
+		mangaEnabled: boolean;
+		bookEnabled: boolean;
+		gameEnabled: boolean;
+		comicEnabled: boolean;
+		last: number;
+		hours: number;
+		rawgKeyId: string;
+		comicvineKeyId: string;
+	}> = {},
+) {
+	const secrets: Record<string, string> = {};
+	if (overrides.rawgKeyId) secrets[overrides.rawgKeyId] = 'rawg-secret';
+	if (overrides.comicvineKeyId) secrets[overrides.comicvineKeyId] = 'cv-secret';
+	return {
+		settings: {
+			libraryMangaEnabled: overrides.mangaEnabled ?? true,
+			libraryMangaFolder: 'Mangas',
+			libraryBookEnabled: overrides.bookEnabled ?? true,
+			libraryBookFolder: 'Books',
+			libraryGameEnabled: overrides.gameEnabled ?? true,
+			libraryGameFolder: 'Games',
+			libraryComicEnabled: overrides.comicEnabled ?? true,
+			libraryComicFolder: 'Comics',
+			libraryLastSync: overrides.last ?? 0,
+			watchlistSyncIntervalHours: overrides.hours ?? 24,
+			RAWGAPIKeyId: overrides.rawgKeyId ?? '',
+			ComicVineKeyId: overrides.comicvineKeyId ?? '',
+		},
+		saveSettings: async () => {},
+		app: {
+			secretStorage: { getSecret: (id: string) => secrets[id] ?? null },
+			vault: {},
+		},
+	} as any;
+}
+
+describe('maybeCatchUp', () => {
+	test('overdue → syncs', async () => {
+		const c = new LibraryController(fakePlugin({ last: 0 }));
+		let called = false;
+		(c as any).syncAll = async () => {
+			called = true;
+		};
+		await c.maybeCatchUp();
+		expect(called).toBe(true);
+	});
+
+	test('recent sync → no call', async () => {
+		const c = new LibraryController(fakePlugin({ last: Date.now() }));
+		let called = false;
+		(c as any).syncAll = async () => {
+			called = true;
+		};
+		await c.maybeCatchUp();
+		expect(called).toBe(false);
+	});
+
+	test('all types disabled → no call', async () => {
+		const c = new LibraryController(fakePlugin({ mangaEnabled: false, bookEnabled: false, gameEnabled: false, comicEnabled: false, last: 0 }));
+		let called = false;
+		(c as any).syncAll = async () => {
+			called = true;
+		};
+		await c.maybeCatchUp();
+		expect(called).toBe(false);
+	});
+});
+
+function fakeSpecDeps() {
+	return { http: async () => ({}), httpText: async () => '', getKey: () => '', log: () => {}, notify: () => {} };
+}
+
+function deferredDeps(): { deps: LibraryEngineDeps; listNotesCalls: () => number; release: () => void } {
+	let listNotesCalls = 0;
+	let release!: () => void;
+	const gate = new Promise<void>(resolve => {
+		release = resolve;
+	});
+	const deps: LibraryEngineDeps = {
+		listNotes: async () => {
+			listNotesCalls++;
+			await gate;
+			return [];
+		},
+		readNote: async () => '',
+		writeNote: async () => {},
+		sleep: async () => {},
+		log: () => {},
+		specDeps: fakeSpecDeps(),
+	};
+	return { deps, listNotesCalls: () => listNotesCalls, release };
+}
+
+describe('concurrency guard', () => {
+	test('overlapping syncType calls: second short-circuits while first is in flight', async () => {
+		const c = new LibraryController(fakePlugin());
+		const { deps, listNotesCalls, release } = deferredDeps();
+		(c as any).makeDeps = () => deps;
+
+		const first = c.syncType(mangaSpec, false);
+		const second = await c.syncType(mangaSpec, false);
+
+		expect(listNotesCalls()).toBe(1);
+		expect(second.scanned).toBe(0);
+		expect(second.written).toBe(0);
+
+		release();
+		const firstResult = await first;
+		expect(firstResult.scanned).toBe(0);
+	});
+
+	test('syncType in flight blocks resolveType (shared guard)', async () => {
+		const c = new LibraryController(fakePlugin());
+		const { deps, release } = deferredDeps();
+		(c as any).makeDeps = () => deps;
+
+		const first = c.syncType(mangaSpec, false);
+		const resolveResult = await c.resolveType(bookSpec);
+
+		expect(resolveResult.resolved.length).toBe(0);
+		expect(resolveResult.ambiguous.length).toBe(0);
+
+		release();
+		await first;
+	});
+
+	test('syncType in flight blocks syncAll (shared guard)', async () => {
+		const c = new LibraryController(fakePlugin());
+		const { deps, release } = deferredDeps();
+		(c as any).makeDeps = () => deps;
+
+		const first = c.syncType(mangaSpec, false);
+		await c.syncAll(false, true); // should short-circuit, not throw
+
+		release();
+		await first;
+	});
+
+	test('flag resets after completion → next call runs normally', async () => {
+		const c = new LibraryController(fakePlugin());
+		let listNotesCalls = 0;
+		(c as any).makeDeps = () => ({
+			listNotes: async () => {
+				listNotesCalls++;
+				return [];
+			},
+			readNote: async () => '',
+			writeNote: async () => {},
+			sleep: async () => {},
+			log: () => {},
+			specDeps: fakeSpecDeps(),
+		});
+
+		await c.syncType(mangaSpec, false);
+		await c.syncType(mangaSpec, false);
+
+		expect(listNotesCalls).toBe(2);
+	});
+});
+
+describe('missing API key handling', () => {
+	test('missing RAWG + Comic Vine keys → one notice each for game/comic, manga/book unaffected', async () => {
+		const c = new LibraryController(fakePlugin()); // no rawgKeyId/comicvineKeyId configured
+		const notices: string[] = [];
+		(c as any).notify = (msg: string) => notices.push(msg);
+		const calledTypes: string[] = [];
+		(c as any).makeDeps = (spec: { typeName: string }) => {
+			calledTypes.push(spec.typeName);
+			return {
+				listNotes: async () => [],
+				readNote: async () => '',
+				writeNote: async () => {},
+				sleep: async () => {},
+				log: () => {},
+				specDeps: fakeSpecDeps(),
+			};
+		};
+
+		await c.syncAll(false, true);
+
+		expect(calledTypes.sort()).toEqual(['book', 'comic', 'game', 'manga']);
+		const keyNotices = notices.filter(m => m.includes('API key not configured'));
+		expect(keyNotices.length).toBe(2);
+		expect(keyNotices.some(m => m.includes('RAWG') && m.includes('game'))).toBe(true);
+		expect(keyNotices.some(m => m.includes('Comic Vine') && m.includes('comic'))).toBe(true);
+	});
+
+	test('keys present → no missing-key notices', async () => {
+		const c = new LibraryController(fakePlugin({ rawgKeyId: 'rid', comicvineKeyId: 'cvid' }));
+		const notices: string[] = [];
+		(c as any).notify = (msg: string) => notices.push(msg);
+		(c as any).makeDeps = () => ({
+			listNotes: async () => [],
+			readNote: async () => '',
+			writeNote: async () => {},
+			sleep: async () => {},
+			log: () => {},
+			specDeps: fakeSpecDeps(),
+		});
+
+		await c.syncAll(false, true);
+
+		expect(notices.filter(m => m.includes('API key not configured')).length).toBe(0);
+	});
+
+	test('single-type sync (game) with missing RAWG key still notifies once and runs', async () => {
+		const c = new LibraryController(fakePlugin({ rawgKeyId: '' }));
+		const notices: string[] = [];
+		(c as any).notify = (msg: string) => notices.push(msg);
+		let ran = false;
+		(c as any).makeDeps = () => {
+			ran = true;
+			return {
+				listNotes: async () => [],
+				readNote: async () => '',
+				writeNote: async () => {},
+				sleep: async () => {},
+				log: () => {},
+				specDeps: fakeSpecDeps(),
+			};
+		};
+
+		await c.syncType(gameSpec, false);
+
+		expect(ran).toBe(true);
+		expect(notices.filter(m => m.includes('API key not configured')).length).toBe(1);
+	});
+});