diff --git a/mcp/mcp-schemas/model/main.smithy b/mcp/mcp-schemas/model/main.smithy
index 916f7671a..c1df8e69e 100644
--- a/mcp/mcp-schemas/model/main.smithy
+++ b/mcp/mcp-schemas/model/main.smithy
@@ -129,8 +129,6 @@ structure JsonArraySchema {
     uniqueItems: PrimitiveBoolean = false
 
     description: String
-
-    default: Document
 }
 
 structure JsonPrimitiveSchema {