diff --git a/packages/core/src/__tests__/client.test.ts b/packages/core/src/__tests__/client.test.ts
new file mode 100644
index 0000000..dcd4d57
--- /dev/null
+++ b/packages/core/src/__tests__/client.test.ts
@@ -0,0 +1,72 @@
+import { describe, it, expect, beforeAll, afterAll } from 'vitest';
+import http from 'node:http';
+import { VisionLClient } from '../client.js';
+import type { ApiResponse, PageInfo } from '../types/api.js';
+
+function createMockServer() {
+  const server = http.createServer((req, res) => {
+    res.setHeader('Content-Type', 'application/json');
+    const url = new URL(req.url!, 'http://localhost');
+
+    if (req.method === 'GET' && url.pathname === '/health') {
+      res.end(JSON.stringify({ status: 'ok' }));
+    } else if (req.method === 'POST' && url.pathname === '/pages') {
+      let body = '';
+      req.on('data', (chunk) => { body += chunk; });
+      req.on('end', () => {
+        const { url: pageUrl, alias } = JSON.parse(body);
+        res.end(JSON.stringify({
+          ok: true,
+          data: { id: 'p_a1b2c3d4', url: pageUrl, alias, title: 'Test Page', status: 'active', profile: 'desktop-chrome' }
+        }));
+      });
+    } else if (req.method === 'GET' && url.pathname === '/pages') {
+      res.end(JSON.stringify({ ok: true, data: [{ id: 'p_test', url: 'https://test.com', title: 'Test', status: 'active' }] }));
+    } else if (req.method === 'GET' && url.pathname.startsWith('/pages/p_test/text')) {
+      res.end(JSON.stringify({ ok: true, data: { text: 'Hello World' } }));
+    } else {
+      res.statusCode = 404;
+      res.end(JSON.stringify({ ok: false, error: { code: 'PAGE_NOT_FOUND', message: 'not found' } }));
+    }
+  });
+  return server;
+}
+
+describe('VisionLClient', () => {
+  let server: http.Server;
+  let client: VisionLClient;
+
+  beforeAll(async () => {
+    server = createMockServer();
+    await new Promise<void>((resolve) => server.listen(19527, resolve));
+    client = new VisionLClient('http://127.0.0.1:19527');
+  });
+
+  afterAll(async () => {
+    await new Promise<void>((resolve) => server.close(() => resolve()));
+  });
+
+  it('health returns true when daemon is up', async () => {
+    const result = await client.health();
+    expect(result).toBe(true);
+  });
+
+  it('openPage returns page info', async () => {
+    const result = await client.openPage('https://example.com', 'demo');
+    expect(result.ok).toBe(true);
+    expect(result.data!.id).toBe('p_a1b2c3d4');
+    expect(result.data!.alias).toBe('demo');
+  });
+
+  it('listPages returns array', async () => {
+    const result = await client.listPages();
+    expect(result.ok).toBe(true);
+    expect(result.data!).toHaveLength(1);
+  });
+
+  it('text returns page content', async () => {
+    const result = await client.text('p_test');
+    expect(result.ok).toBe(true);
+    expect(result.data!.text).toBe('Hello World');
+  });
+});
diff --git a/packages/core/src/client.ts b/packages/core/src/client.ts
new file mode 100644
index 0000000..beed1b2
--- /dev/null
+++ b/packages/core/src/client.ts
@@ -0,0 +1,85 @@
+import type { ApiResponse, PageInfo } from './types/api.js';
+
+export class VisionLClient {
+  constructor(private baseUrl: string) {}
+
+  private async request<T>(method: string, path: string, body?: unknown): Promise<ApiResponse<T>> {
+    const url = `${this.baseUrl}${path}`;
+    const options: RequestInit = {
+      method,
+      headers: { 'Content-Type': 'application/json' },
+    };
+    if (body !== undefined) {
+      options.body = JSON.stringify(body);
+    }
+
+    const response = await fetch(url, options);
+    const json = await response.json() as ApiResponse<T>;
+    return json;
+  }
+
+  async health(): Promise<boolean> {
+    try {
+      const res = await this.request<{ status: string }>('GET', '/health');
+      return res.ok || (res.data as any)?.status === 'ok' || (res as any).status === 'ok';
+    } catch {
+      return false;
+    }
+  }
+
+  async openPage(url: string, alias?: string, profile?: string): Promise<ApiResponse<PageInfo>> {
+    return this.request<PageInfo>('POST', '/pages', { url, alias, profile });
+  }
+
+  async listPages(): Promise<ApiResponse<PageInfo[]>> {
+    return this.request<PageInfo[]>('GET', '/pages');
+  }
+
+  async getPage(id: string): Promise<ApiResponse<PageInfo>> {
+    return this.request<PageInfo>('GET', `/pages/${id}`);
+  }
+
+  async killPage(id: string): Promise<ApiResponse<null>> {
+    return this.request<null>('DELETE', `/pages/${id}`);
+  }
+
+  async navigate(id: string, url: string): Promise<ApiResponse<{ url: string; title: string }>> {
+    return this.request('POST', `/pages/${id}/navigate`, { url });
+  }
+
+  async click(id: string, selector: string): Promise<ApiResponse<{ success: boolean }>> {
+    return this.request('POST', `/pages/${id}/click`, { selector });
+  }
+
+  async type(id: string, selector: string, text: string): Promise<ApiResponse<{ success: boolean }>> {
+    return this.request('POST', `/pages/${id}/type`, { selector, text });
+  }
+
+  async scroll(id: string, opts: { deltaY?: number; toBottom?: boolean }): Promise<ApiResponse<{ success: boolean }>> {
+    return this.request('POST', `/pages/${id}/scroll`, opts);
+  }
+
+  async eval(id: string, code: string): Promise<ApiResponse<{ result: unknown }>> {
+    return this.request('POST', `/pages/${id}/eval`, { code });
+  }
+
+  async wait(id: string, opts: { selector?: string; ms?: number }): Promise<ApiResponse<{ success: boolean }>> {
+    return this.request('POST', `/pages/${id}/wait`, opts);
+  }
+
+  async screenshot(id: string): Promise<ApiResponse<{ base64: string; mime: string }>> {
+    return this.request('GET', `/pages/${id}/screenshot`);
+  }
+
+  async text(id: string): Promise<ApiResponse<{ text: string }>> {
+    return this.request('GET', `/pages/${id}/text`);
+  }
+
+  async html(id: string): Promise<ApiResponse<{ html: string }>> {
+    return this.request('GET', `/pages/${id}/html`);
+  }
+
+  async getProfiles(): Promise<ApiResponse<Array<{ id: string; name: string }>>> {
+    return this.request('GET', '/profiles');
+  }
+}
diff --git a/packages/core/src/index.ts b/packages/core/src/index.ts
index 39c3620..b28674a 100644
--- a/packages/core/src/index.ts
+++ b/packages/core/src/index.ts
@@ -9,3 +9,4 @@ export {
   type PermissionState,
 } from './types/fingerprint.js';
 export { safeStringify, isValidJson } from './escape.js';
+export { VisionLClient } from './client.js';