diff --git a/frontend/src/__tests__/hooks/useAgentActionsFlyToZoom.test.ts b/frontend/src/__tests__/hooks/useAgentActionsFlyToZoom.test.ts
new file mode 100644
index 0000000..8442777
--- /dev/null
+++ b/frontend/src/__tests__/hooks/useAgentActionsFlyToZoom.test.ts
@@ -0,0 +1,73 @@
+/**
+ * Agent fly_to zoom regression.
+ *
+ * `sar_focus_aoi` carries a zoom: a world-view revert asks for ~2, a tight
+ * AOI for ~9.  The zoom used to be dropped between the poll and the map, so
+ * every agent move landed at a hardcoded zoom 8 — "show the whole world"
+ * rendered as a patch of empty ocean.  These tests pin the whole path:
+ * the hook forwards zoom, the dashboard stores it, the viewer honors it.
+ */
+import { afterEach, describe, expect, it, vi } from 'vitest';
+import { renderHook, waitFor } from '@testing-library/react';
+import * as fs from 'fs';
+import * as path from 'path';
+
+import { useAgentActions } from '@/hooks/useAgentActions';
+
+const SRC_DIR = path.resolve(__dirname, '../../');
+
+function readSource(rel: string): string {
+  return fs.readFileSync(path.join(SRC_DIR, rel), 'utf-8');
+}
+
+function mockActions(actions: unknown[]) {
+  return vi.fn().mockResolvedValue({
+    ok: true,
+    json: async () => ({ actions }),
+  });
+}
+
+describe('useAgentActions — fly_to zoom', () => {
+  afterEach(() => {
+    vi.restoreAllMocks();
+    vi.unstubAllGlobals();
+  });
+
+  it('forwards the zoom the agent asked for', async () => {
+    vi.stubGlobal(
+      'fetch',
+      mockActions([{ action: 'fly_to', lat: 20, lng: 0, zoom: 2, aoi_id: 'world' }]),
+    );
+    const onFlyTo = vi.fn();
+    renderHook(() => useAgentActions(vi.fn(), onFlyTo));
+
+    await waitFor(() =>
+      expect(onFlyTo).toHaveBeenCalledWith({ lat: 20, lng: 0, zoom: 2 }),
+    );
+  });
+
+  it('leaves zoom undefined when the action omits it', async () => {
+    vi.stubGlobal('fetch', mockActions([{ action: 'fly_to', lat: 51.5, lng: -0.1 }]));
+    const onFlyTo = vi.fn();
+    renderHook(() => useAgentActions(vi.fn(), onFlyTo));
+
+    await waitFor(() =>
+      expect(onFlyTo).toHaveBeenCalledWith({ lat: 51.5, lng: -0.1, zoom: undefined }),
+    );
+  });
+});
+
+describe('fly_to zoom survives the wiring', () => {
+  it('the dashboard stores the agent zoom in flyToLocation', () => {
+    const page = readSource('app/page.tsx');
+    expect(page).toMatch(
+      /useAgentActions\(\s*handleMapRightClick,\s*\(\{ lat, lng, zoom \}\) => \{\s*setFlyToLocation\(\{ lat, lng, zoom, ts: Date\.now\(\) \}\);/,
+    );
+  });
+
+  it('the viewer flies to the requested zoom, defaulting to 8', () => {
+    const viewer = readSource('components/MaplibreViewer.tsx');
+    expect(viewer).toContain('zoom: flyToLocation.zoom ?? 8,');
+    expect(viewer).not.toMatch(/center: \[flyToLocation\.lng, flyToLocation\.lat\],\s*zoom: 8,/);
+  });
+});