chore: evaluate select_page scenario (#925)

Passes the test with gemini-2.5-flash with no errors.

Closes #921

Author: OrKoN

scripts/eval_gemini.ts

@@ -142,7 +142,9 @@ async function runSingleScenario(
         name: request.name,
         args: (request.arguments as Record<string, unknown>) || {},
       });
-      return originalCallTool(request, schema);
+      const response = await originalCallTool(request, schema);
+      debugLog(`Tool response: ${JSON.stringify(response)}`);
+      return response;
     };
 
     const ai = new GoogleGenAI({apiKey});

scripts/eval_scenarios/select_page_test.ts

@@ -0,0 +1,40 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import assert from 'node:assert';
+
+import type {TestScenario} from '../eval_gemini.ts';
+
+export const scenario: TestScenario = {
+  prompt:
+    'Open new page <TEST_URL> and then open new page https://developers.chrome.com. Select the <TEST_URL> page.',
+  maxTurns: 3,
+  htmlRoute: {
+    path: '/test.html',
+    htmlContent: `
+      <h1>test</h1>
+    `,
+  },
+  expectations: calls => {
+    assert.strictEqual(calls.length, 3);
+    assert.ok(calls[0].name === 'new_page', 'First call should be navigation');
+    assert.ok(calls[1].name === 'new_page', 'Second call should be navigation');
+    assert.ok(
+      calls[2].name === 'select_page',
+      'Third call should be select_page',
+    );
+    assert.strictEqual(
+      calls[2].args.pageId,
+      2,
+      'PageId has to be set to 2. about:blank is 1, <TEST_URL> is 2, https://developers.chrome.com is 3.',
+    );
+    assert.strictEqual(
+      calls[2].args.bringToFront,
+      undefined,
+      'bringToFront should use the default value.',
+    );
+  },
+};