diff --git a/README.md b/README.md
index 8dacd7c..37e001b 100644
--- a/README.md
+++ b/README.md
@@ -65,6 +65,7 @@ $ npx @nitpicker/cli crawl https://example.com
 $ npx @nitpicker/cli crawl https://example.com --interval 5000
 $ npx @nitpicker/cli crawl https://example.com --parallels 50
 $ npx @nitpicker/cli crawl https://example.com --no-image
+$ npx @nitpicker/cli crawl https://example.com --single
 $ npx @nitpicker/cli crawl https://example.com --no-fetch-external
 $ npx @nitpicker/cli crawl https://example.com --no-recursive
 $ npx @nitpicker/cli crawl https://example.com --scope "www.example.com, www3.example.com, https://blog.example.com/blog"
diff --git a/packages/@nitpicker/cli/src/commands/crawl.spec.ts b/packages/@nitpicker/cli/src/commands/crawl.spec.ts
new file mode 100644
index 0000000..cd0f8eb
--- /dev/null
+++ b/packages/@nitpicker/cli/src/commands/crawl.spec.ts
@@ -0,0 +1,172 @@
+import type { CrawlerOrchestrator as OrchestratorType } from '@nitpicker/crawler';
+
+import { afterEach, beforeEach, describe, it, expect, vi } from 'vitest';
+
+const mockCrawling = vi.fn();
+
+vi.mock('@nitpicker/crawler', () => ({
+	CrawlerOrchestrator: {
+		crawling: mockCrawling,
+	},
+}));
+
+vi.mock('../crawl/event-assignments.js', () => ({
+	eventAssignments: vi.fn().mockResolvedValue(),
+}));
+
+vi.mock('../crawl/debug.js', () => ({
+	log: vi.fn(),
+	verbosely: vi.fn(),
+}));
+
+type CrawlFlags = Parameters<typeof import('./crawl.js').startCrawl>[1];
+
+/**
+ * Minimal flags matching the shape produced by the CLI parser.
+ * @param overrides - Flag values to override defaults.
+ */
+function createFlags(overrides: Partial<CrawlFlags> = {}): CrawlFlags {
+	return {
+		resume: undefined,
+		interval: undefined,
+		image: true,
+		fetchExternal: true,
+		parallels: undefined,
+		recursive: true,
+		scope: undefined,
+		exclude: undefined,
+		excludeKeyword: undefined,
+		excludeUrl: undefined,
+		disableQueries: undefined,
+		imageFileSizeThreshold: undefined,
+		single: undefined,
+		maxExcludedDepth: undefined,
+		retry: 3,
+		list: undefined,
+		listFile: undefined,
+		userAgent: undefined,
+		ignoreRobots: undefined,
+		output: undefined,
+		verbose: undefined,
+		silent: undefined,
+		diff: undefined,
+		...overrides,
+	} as CrawlFlags;
+}
+
+/** Sets up the fake orchestrator that mockCrawling returns. */
+function setupFakeOrchestrator() {
+	const fakeOrchestrator = {
+		write: vi.fn().mockResolvedValue(),
+		garbageCollect: vi.fn(),
+		archive: { filePath: '/tmp/test.nitpicker' },
+	} as unknown as OrchestratorType;
+
+	mockCrawling.mockImplementation((_urls, _opts, cb) => {
+		cb?.(fakeOrchestrator, { baseUrl: 'https://example.com' });
+		return Promise.resolve(fakeOrchestrator);
+	});
+}
+
+describe('startCrawl', () => {
+	beforeEach(() => {
+		vi.clearAllMocks();
+		vi.resetModules();
+		setupFakeOrchestrator();
+	});
+
+	it('--single フラグが true の場合、recursive: false で CrawlerOrchestrator.crawling を呼び出す', async () => {
+		const { startCrawl } = await import('./crawl.js');
+		await startCrawl(['https://example.com'], createFlags({ single: true }));
+
+		expect(mockCrawling).toHaveBeenCalledWith(
+			['https://example.com'],
+			expect.objectContaining({ recursive: false }),
+			expect.any(Function),
+		);
+	});
+
+	it('--single フラグが未指定の場合、recursive はフラグの値がそのまま渡される', async () => {
+		const { startCrawl } = await import('./crawl.js');
+		await startCrawl(['https://example.com'], createFlags({ recursive: true }));
+
+		expect(mockCrawling).toHaveBeenCalledWith(
+			['https://example.com'],
+			expect.objectContaining({ recursive: true }),
+			expect.any(Function),
+		);
+	});
+
+	it('--single と --recursive が同時指定された場合、--single が優先され recursive: false になる', async () => {
+		const { startCrawl } = await import('./crawl.js');
+		await startCrawl(
+			['https://example.com'],
+			createFlags({ single: true, recursive: true }),
+		);
+
+		expect(mockCrawling).toHaveBeenCalledWith(
+			['https://example.com'],
+			expect.objectContaining({ recursive: false }),
+			expect.any(Function),
+		);
+	});
+
+	it('--list モードでも recursive: false になる', async () => {
+		const { startCrawl } = await import('./crawl.js');
+		await startCrawl(
+			['https://example.com'],
+			createFlags({ list: ['https://example.com/a'] }),
+		);
+
+		expect(mockCrawling).toHaveBeenCalledWith(
+			['https://example.com'],
+			expect.objectContaining({ recursive: false, list: true }),
+			expect.any(Function),
+		);
+	});
+});
+
+describe('crawl', () => {
+	let consoleWarnSpy: ReturnType<typeof vi.spyOn>;
+
+	beforeEach(() => {
+		vi.clearAllMocks();
+		vi.resetModules();
+		setupFakeOrchestrator();
+		consoleWarnSpy = vi.spyOn(console, 'warn').mockImplementation(() => {});
+	});
+
+	afterEach(() => {
+		vi.restoreAllMocks();
+	});
+
+	it('--single と --list を同時指定した場合、警告を出力する', async () => {
+		const { crawl } = await import('./crawl.js');
+		await crawl([], createFlags({ single: true, list: ['https://example.com/a'] }));
+
+		expect(consoleWarnSpy).toHaveBeenCalledWith(
+			'Warning: --single is ignored when --list or --list-file is specified.',
+		);
+	});
+
+	it('--single と --list-file を同時指定した場合、警告を出力する', async () => {
+		const { crawl } = await import('./crawl.js');
+
+		vi.mock('@d-zero/readtext/list', () => ({
+			readList: vi.fn().mockResolvedValue(['https://example.com/a']),
+		}));
+
+		await crawl([], createFlags({ single: true, listFile: '/tmp/list.txt' }));
+
+		expect(consoleWarnSpy).toHaveBeenCalledWith(
+			'Warning: --single is ignored when --list or --list-file is specified.',
+		);
+	});
+
+	it('--single のみの場合、警告を出力しない', async () => {
+		const { crawl } = await import('./crawl.js');
+		await crawl(['https://example.com'], createFlags({ single: true }));
+
+		expect(consoleWarnSpy).not.toHaveBeenCalled();
+	});
+});
diff --git a/packages/@nitpicker/cli/src/commands/crawl.ts b/packages/@nitpicker/cli/src/commands/crawl.ts
index 3748a96..85b876a 100644
--- a/packages/@nitpicker/cli/src/commands/crawl.ts
+++ b/packages/@nitpicker/cli/src/commands/crawl.ts
@@ -184,7 +184,8 @@ export async function startCrawl(siteUrl: string[], flags: CrawlFlags): Promise<
 			...mapFlagsToCrawlConfig(flags),
 			filePath: flags.output,
 			list: isList,
-			recursive: isList ? false : flags.recursive,
+			// --single（単一ページモード）および --list モードでは再帰クロールを無効化
+			recursive: isList || flags.single ? false : flags.recursive,
 		},
 		(orchestrator, config) => {
 			run(
@@ -290,6 +291,11 @@ export async function crawl(args: string[], flags: CrawlFlags) {
 		return;
 	}
 
+	if (flags.single && (flags.list?.length || flags.listFile)) {
+		// eslint-disable-next-line no-console
+		console.warn('Warning: --single is ignored when --list or --list-file is specified.');
+	}
+
 	if (flags.listFile) {
 		const list = await readList(path.resolve(process.cwd(), flags.listFile));
 		flags.list = list;
diff --git a/packages/@nitpicker/cli/src/commands/pipeline.spec.ts b/packages/@nitpicker/cli/src/commands/pipeline.spec.ts
index 45759ce..064aabe 100644
--- a/packages/@nitpicker/cli/src/commands/pipeline.spec.ts
+++ b/packages/@nitpicker/cli/src/commands/pipeline.spec.ts
@@ -237,6 +237,21 @@ describe('pipeline command', () => {
 		expect(reportFn).toHaveBeenCalledWith([archivePath], expect.any(Object));
 	});
 
+	it('passes --single flag to startCrawl', async () => {
+		vi.mocked(startCrawlFn).mockResolvedValue('/tmp/site.nitpicker');
+		vi.mocked(analyzeFn).mockResolvedValue();
+
+		await pipeline(['https://example.com'], {
+			...defaultFlags,
+			single: true,
+		});
+
+		expect(startCrawlFn).toHaveBeenCalledWith(
+			['https://example.com'],
+			expect.objectContaining({ single: true }),
+		);
+	});
+
 	it('propagates error when startCrawl rejects', async () => {
 		const crawlError = new Error('Crawl failed');
 		vi.mocked(startCrawlFn).mockRejectedValue(crawlError);