add tool example

examples/ai-core/src/generate-object/google-vertex-tool.ts

@@ -0,0 +1,31 @@
+import { vertex } from '@ai-sdk/google-vertex';
+import { generateObject } from 'ai';
+import 'dotenv/config';
+import { z } from 'zod';
+
+async function main() {
+  const result = await generateObject({
+    model: vertex('gemini-1.5-pro'),
+    mode: 'tool',
+    schema: z.object({
+      recipe: z.object({
+        name: z.string(),
+        ingredients: z.array(
+          z.object({
+            name: z.string(),
+            amount: z.string(),
+          }),
+        ),
+        steps: z.array(z.string()),
+      }),
+    }),
+    prompt: 'Generate a lasagna recipe.',
+  });
+
+  console.log(JSON.stringify(result.object.recipe, null, 2));
+  console.log();
+  console.log('Token usage:', result.usage);
+  console.log('Finish reason:', result.finishReason);
+}
+
+main().catch(console.error);