feat(vertex): add settings for Vertex AI request routing (#25513)

packages/cli/src/config/config.ts

@@ -1032,6 +1032,7 @@ export async function loadCliConfig(
     recordResponses: argv.recordResponses,
     retryFetchErrors: settings.general?.retryFetchErrors,
     billing: settings.billing,
+    vertexAiRouting: settings.billing?.vertexAi,
     maxAttempts: settings.general?.maxAttempts,
     ptyInfo: ptyInfo?.name,
     disableLLMCorrection: settings.tools?.disableLLMCorrection,

packages/cli/src/config/settingsSchema.test.ts

@@ -313,6 +313,22 @@ describe('SettingsSchema', () => {
       ).toBe(false);
     });
 
+    it('should have Vertex AI routing settings in schema', () => {
+      const vertexAi =
+        getSettingsSchema().billing.properties.vertexAi.properties;
+
+      expect(vertexAi.requestType).toBeDefined();
+      expect(vertexAi.requestType.type).toBe('enum');
+      expect(
+        vertexAi.requestType.options?.map((option) => option.value),
+      ).toEqual(['dedicated', 'shared']);
+      expect(vertexAi.sharedRequestType).toBeDefined();
+      expect(vertexAi.sharedRequestType.type).toBe('enum');
+      expect(
+        vertexAi.sharedRequestType.options?.map((option) => option.value),
+      ).toEqual(['priority', 'flex']);
+    });
+
     it('should have folderTrustFeature setting in schema', () => {
       expect(
         getSettingsSchema().security.properties.folderTrust.properties.enabled,

packages/cli/src/config/settingsSchema.ts

@@ -21,6 +21,7 @@ import {
   type AgentOverride,
   type CustomTheme,
   type SandboxConfig,
+  type VertexAiRoutingConfig,
 } from '@google/gemini-cli-core';
 import type { SessionRetentionSettings } from './settings.js';
 import { DEFAULT_MIN_RETENTION } from '../utils/sessionCleanup.js';
@@ -990,6 +991,45 @@ const SETTINGS_SCHEMA = {
           { value: 'never', label: 'Never use credits' },
         ],
       },
+      vertexAi: {
+        type: 'object',
+        label: 'Vertex AI',
+        category: 'Advanced',
+        requiresRestart: true,
+        default: undefined as VertexAiRoutingConfig | undefined,
+        description: 'Vertex AI request routing settings.',
+        showInDialog: false,
+        properties: {
+          requestType: {
+            type: 'enum',
+            label: 'Vertex AI Request Type',
+            category: 'Advanced',
+            requiresRestart: true,
+            default: undefined as VertexAiRoutingConfig['requestType'],
+            description:
+              'Sets the X-Vertex-AI-LLM-Request-Type header for Vertex AI requests.',
+            showInDialog: false,
+            options: [
+              { value: 'dedicated', label: 'Dedicated' },
+              { value: 'shared', label: 'Shared' },
+            ],
+          },
+          sharedRequestType: {
+            type: 'enum',
+            label: 'Vertex AI Shared Request Type',
+            category: 'Advanced',
+            requiresRestart: true,
+            default: undefined as VertexAiRoutingConfig['sharedRequestType'],
+            description:
+              'Sets the X-Vertex-AI-LLM-Shared-Request-Type header for Vertex AI requests.',
+            showInDialog: false,
+            options: [
+              { value: 'priority', label: 'Priority' },
+              { value: 'flex', label: 'Flex' },
+            ],
+          },
+        },
+      },
     },
   },