diff --git a/open-sse/translator/request/antigravity-to-openai.js b/open-sse/translator/request/antigravity-to-openai.js
index 8d729a59..9a3b5d21 100644
--- a/open-sse/translator/request/antigravity-to-openai.js
+++ b/open-sse/translator/request/antigravity-to-openai.js
@@ -89,15 +89,21 @@ export function antigravityToOpenAIRequest(model, body, stream) {
 }
 
 // Recursively convert Antigravity schema types (OBJECT, STRING, etc.) to lowercase
+// and strip unsupported fields like enumDescriptions
 function normalizeSchemaTypes(schema) {
   if (!schema || typeof schema !== "object") return schema;
 
   const result = Array.isArray(schema) ? [...schema] : { ...schema };
 
+
   if (typeof result.type === "string") {
     result.type = result.type.toLowerCase();
   }
 
+  // Strip enumDescriptions — not supported by upstream APIs
+  delete result.enumDescriptions;
+
+
   if (result.properties) {
     const normalized = {};
     for (const [key, val] of Object.entries(result.properties)) {