fix(browser-agent): enable "Allow all server tools" session policy (#22343)

integration-tests/browser-policy.responses

@@ -0,0 +1,5 @@
+{"method":"generateContentStream","response":[{"candidates":[{"content":{"parts":[{"text":"I'll help you with that."},{"functionCall":{"name":"browser_agent","args":{"task":"Open https://example.com and check if there is a heading"}}}],"role":"model"},"finishReason":"STOP","index":0}],"usageMetadata":{"promptTokenCount":100,"candidatesTokenCount":50,"totalTokenCount":150}}]}
+{"method":"generateContentStream","response":[{"candidates":[{"content":{"parts":[{"functionCall":{"name":"new_page","args":{"url":"https://example.com"}}}],"role":"model"},"finishReason":"STOP","index":0}],"usageMetadata":{"promptTokenCount":100,"candidatesTokenCount":50,"totalTokenCount":150}}]}
+{"method":"generateContentStream","response":[{"candidates":[{"content":{"parts":[{"functionCall":{"name":"take_snapshot","args":{}}}],"role":"model"},"finishReason":"STOP","index":0}],"usageMetadata":{"promptTokenCount":100,"candidatesTokenCount":50,"totalTokenCount":150}}]}
+{"method":"generateContentStream","response":[{"candidates":[{"content":{"parts":[{"functionCall":{"name":"complete_task","args":{"success":true,"summary":"SUCCESS_POLICY_TEST_COMPLETED"}}}],"role":"model"},"finishReason":"STOP","index":0}],"usageMetadata":{"promptTokenCount":100,"candidatesTokenCount":50,"totalTokenCount":150}}]}
+{"method":"generateContentStream","response":[{"candidates":[{"content":{"parts":[{"text":"Task completed successfully. The page has the heading \"Example Domain\"."}],"role":"model"},"finishReason":"STOP","index":0}],"usageMetadata":{"promptTokenCount":200,"candidatesTokenCount":50,"totalTokenCount":250}}]}

integration-tests/browser-policy.test.ts

@@ -0,0 +1,178 @@
+/**
+ * @license
+ * Copyright 2026 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { TestRig, poll } from './test-helper.js';
+import { dirname, join } from 'node:path';
+import { fileURLToPath } from 'node:url';
+import { execSync } from 'node:child_process';
+import { existsSync, writeFileSync, readFileSync, mkdirSync } from 'node:fs';
+import stripAnsi from 'strip-ansi';
+
+const __filename = fileURLToPath(import.meta.url);
+const __dirname = dirname(__filename);
+
+const chromeAvailable = (() => {
+  try {
+    if (process.platform === 'darwin') {
+      execSync(
+        'test -d "/Applications/Google Chrome.app"  || test -d "/Applications/Chromium.app"',
+        {
+          stdio: 'ignore',
+        },
+      );
+    } else if (process.platform === 'linux') {
+      execSync(
+        'which google-chrome || which chromium-browser || which chromium',
+        { stdio: 'ignore' },
+      );
+    } else if (process.platform === 'win32') {
+      const chromePaths = [
+        'C:\\Program Files\\Google\\Chrome\\Application\\chrome.exe',
+        'C:\\Program Files (x86)\\Google\\Chrome\\Application\\chrome.exe',
+        `${process.env['LOCALAPPDATA'] ?? ''}\\Google\\Chrome\\Application\\chrome.exe`,
+      ];
+      const found = chromePaths.some((p) => existsSync(p));
+      if (!found) {
+        execSync('where chrome || where chromium', { stdio: 'ignore' });
+      }
+    } else {
+      return false;
+    }
+    return true;
+  } catch {
+    return false;
+  }
+})();
+
+describe.skipIf(!chromeAvailable)('browser-policy', () => {
+  let rig: TestRig;
+
+  beforeEach(() => {
+    rig = new TestRig();
+  });
+
+  afterEach(async () => {
+    await rig.cleanup();
+  });
+
+  it('should skip confirmation when "Allow all server tools for this session" is chosen', async () => {
+    rig.setup('browser-policy-skip-confirmation', {
+      fakeResponsesPath: join(__dirname, 'browser-policy.responses'),
+      settings: {
+        agents: {
+          overrides: {
+            browser_agent: {
+              enabled: true,
+            },
+          },
+          browser: {
+            headless: true,
+            sessionMode: 'isolated',
+            allowedDomains: ['example.com'],
+          },
+        },
+      },
+    });
+
+    // Manually trust the folder to avoid the dialog and enable option 3
+    const geminiDir = join(rig.homeDir!, '.gemini');
+    mkdirSync(geminiDir, { recursive: true });
+
+    // Write to trustedFolders.json
+    const trustedFoldersPath = join(geminiDir, 'trustedFolders.json');
+    const trustedFolders = {
+      [rig.testDir!]: 'TRUST_FOLDER',
+    };
+    writeFileSync(trustedFoldersPath, JSON.stringify(trustedFolders, null, 2));
+
+    // Force confirmation for browser agent.
+    // NOTE: We don't force confirm browser tools here because "Allow all server tools"
+    // adds a rule with ALWAYS_ALLOW_PRIORITY (3.9x) which would be overshadowed by
+    // a rule in the user tier (4.x) like the one from this TOML.
+    // By removing the explicit mcp rule, the first MCP tool will still prompt
+    // due to default approvalMode = 'default', and then "Allow all" will correctly
+    // bypass subsequent tools.
+    const policyFile = join(rig.testDir!, 'force-confirm.toml');
+    writeFileSync(
+      policyFile,
+      `
+[[rule]]
+name = "Force confirm browser_agent"
+toolName = "browser_agent"
+decision = "ask_user"
+priority = 200
+`,
+    );
+
+    // Update settings.json in both project and home directories to point to the policy file
+    for (const baseDir of [rig.testDir!, rig.homeDir!]) {
+      const settingsPath = join(baseDir, '.gemini', 'settings.json');
+      if (existsSync(settingsPath)) {
+        const settings = JSON.parse(readFileSync(settingsPath, 'utf-8'));
+        settings.policyPaths = [policyFile];
+        // Ensure folder trust is enabled
+        settings.security = settings.security || {};
+        settings.security.folderTrust = settings.security.folderTrust || {};
+        settings.security.folderTrust.enabled = true;
+        writeFileSync(settingsPath, JSON.stringify(settings, null, 2));
+      }
+    }
+
+    const run = await rig.runInteractive({
+      approvalMode: 'default',
+      env: {
+        GEMINI_CLI_INTEGRATION_TEST: 'true',
+      },
+    });
+
+    await run.sendKeys(
+      'Open https://example.com and check if there is a heading\r',
+    );
+    await run.sendKeys('\r');
+
+    // Handle confirmations.
+    // 1. Initial browser_agent delegation (likely only 3 options, so use option 1: Allow once)
+    await poll(
+      () => stripAnsi(run.output).toLowerCase().includes('action required'),
+      60000,
+      1000,
+    );
+    await run.sendKeys('1\r');
+    await new Promise((r) => setTimeout(r, 2000));
+
+    // Handle privacy notice
+    await poll(
+      () => stripAnsi(run.output).toLowerCase().includes('privacy notice'),
+      5000,
+      100,
+    );
+    await run.sendKeys('1\r');
+    await new Promise((r) => setTimeout(r, 5000));
+
+    // new_page (MCP tool, should have 4 options, use option 3: Allow all server tools)
+    await poll(
+      () => {
+        const stripped = stripAnsi(run.output).toLowerCase();
+        return (
+          stripped.includes('new_page') &&
+          stripped.includes('allow all server tools for this session')
+        );
+      },
+      60000,
+      1000,
+    );
+
+    // Select "Allow all server tools for this session" (option 3)
+    await run.sendKeys('3\r');
+    await new Promise((r) => setTimeout(r, 30000));
+
+    const output = stripAnsi(run.output).toLowerCase();
+
+    expect(output).toContain('browser_agent');
+    expect(output).toContain('completed successfully');
+  });
+});