feat: add schema utility

Co-Authored-By: Han Xiao <han.xiao@jina.ai>

src/utils/schema.ts

@@ -0,0 +1,31 @@
+import { z } from 'zod';
+
+export function createResponseSchema(config: {
+  type: 'object';
+  properties: Record<string, {
+    type: string;
+    description: string;
+    items?: any;
+    maxItems?: number;
+    minItems?: number;
+  }>;
+  required: string[];
+}) {
+  const properties: Record<string, any> = {};
+  
+  for (const [key, prop] of Object.entries(config.properties)) {
+    if (prop.type === 'STRING') {
+      properties[key] = z.string().describe(prop.description);
+    } else if (prop.type === 'BOOLEAN') {
+      properties[key] = z.boolean().describe(prop.description);
+    } else if (prop.type === 'ARRAY') {
+      const itemSchema = prop.items.type === 'STRING' ? z.string() : z.object({});
+      properties[key] = z.array(itemSchema)
+        .describe(prop.description)
+        .max(prop.maxItems || Infinity)
+        .min(prop.minItems || 0);
+    }
+  }
+  
+  return z.object(properties);
+}