handle powershell prompt objects

server/index.ts

@@ -203,8 +203,24 @@ function uploadedFileToPart(file: Express.Multer.File): GeminiPart {
   };
 }
 
+function normalizeTextInput(value: unknown) {
+  if (typeof value === 'string') {
+    return value;
+  }
+
+  if (Array.isArray(value)) {
+    return value.map((item) => normalizeTextInput(item)).join('\n');
+  }
+
+  if (value && typeof value === 'object' && 'value' in value) {
+    return normalizeTextInput((value as { value: unknown }).value);
+  }
+
+  return value == null ? '' : String(value);
+}
+
 async function buildParts(body: GenerateRequest, files: Express.Multer.File[] = []) {
-  const prompt = (body.prompt || body.instruction || '').trim();
+  const prompt = normalizeTextInput(body.prompt || body.instruction).trim();
   if (!prompt) {
     throw new Error('prompt or instruction is required.');
   }