diff --git a/CLAUDE.md b/CLAUDE.md
index 47dc3e3d863..c3170642553 120000
--- a/CLAUDE.md
+++ b/CLAUDE.md
@@ -1 +1 @@
-AGENTS.md
\ No newline at end of file
+AGENTS.md
diff --git a/src/agents/schema/clean-for-gemini.ts b/src/agents/schema/clean-for-gemini.ts
index 669d8b9ac03..7841f5e93a4 100644
--- a/src/agents/schema/clean-for-gemini.ts
+++ b/src/agents/schema/clean-for-gemini.ts
@@ -241,6 +241,13 @@ function cleanSchemaForGeminiWithDefs(
       const result: Record<string, unknown> = {
         ...(cleaned as Record<string, unknown>),
       };
+
+      for (const [key, value] of Object.entries(obj)) {
+        if (key !== "$ref" && value !== undefined) {
+          result[key] = value;
+        }
+      }
+
       copySchemaMeta(obj, result);
       return result;
     }