diff --git a/specification/v0_10/json/client_to_server_list.json b/specification/v0_10/json/client_to_server_list.json
index 9db512456..cd0a74429 100644
--- a/specification/v0_10/json/client_to_server_list.json
+++ b/specification/v0_10/json/client_to_server_list.json
@@ -3,8 +3,17 @@
   "$id": "https://a2ui.org/specification/v0_10/client_to_server_list.json",
   "title": "A2UI Client-to-Server Message List",
   "description": "A list of A2UI Client-to-Server messages.",
-  "type": "array",
-  "items": {
-    "$ref": "client_to_server.json"
-  }
+  "type": "object",
+  "properties": {
+    "messages": {
+      "type": "array",
+      "items": {
+        "$ref": "client_to_server.json"
+      }
+    }
+  },
+  "additionalProperties": false,
+  "required": [
+    "messages"
+  ]
 }
diff --git a/specification/v0_10/json/server_to_client_list.json b/specification/v0_10/json/server_to_client_list.json
index 3978f6a2b..e2b372c81 100644
--- a/specification/v0_10/json/server_to_client_list.json
+++ b/specification/v0_10/json/server_to_client_list.json
@@ -3,8 +3,17 @@
   "$id": "https://a2ui.org/specification/v0_10/server_to_client_list.json",
   "title": "A2UI Server-to-Client Message List",
   "description": "A list of A2UI Server-to-Client messages.",
-  "type": "array",
-  "items": {
-    "$ref": "server_to_client.json"
-  }
+  "type": "object",
+  "properties": {
+    "messages": {
+      "type": "array",
+      "items": {
+        "$ref": "server_to_client.json"
+      }
+    }
+  },
+  "additionalProperties": false,
+  "required": [
+    "messages"
+  ]
 }
diff --git a/specification/v0_9/json/client_to_server_list.json b/specification/v0_9/json/client_to_server_list.json
index adfffac30..2714a8332 100644
--- a/specification/v0_9/json/client_to_server_list.json
+++ b/specification/v0_9/json/client_to_server_list.json
@@ -3,8 +3,17 @@
   "$id": "https://a2ui.org/specification/v0_9/client_to_server_list.json",
   "title": "A2UI Client-to-Server Message List",
   "description": "A list of A2UI Client-to-Server messages.",
-  "type": "array",
-  "items": {
-    "$ref": "client_to_server.json"
-  }
+  "type": "object",
+  "properties": {
+    "messages": {
+      "type": "array",
+      "items": {
+        "$ref": "client_to_server.json"
+      }
+    }
+  },
+  "additionalProperties": false,
+  "required": [
+    "messages"
+  ]
 }
diff --git a/specification/v0_9/json/server_to_client_list.json b/specification/v0_9/json/server_to_client_list.json
index 5bf92bcc6..66d726333 100644
--- a/specification/v0_9/json/server_to_client_list.json
+++ b/specification/v0_9/json/server_to_client_list.json
@@ -3,8 +3,17 @@
   "$id": "https://a2ui.org/specification/v0_9/server_to_client_list.json",
   "title": "A2UI Server-to-Client Message List",
   "description": "A list of A2UI Server-to-Client messages.",
-  "type": "array",
-  "items": {
-    "$ref": "server_to_client.json"
-  }
+  "type": "object",
+  "properties": {
+    "messages": {
+      "type": "array",
+      "items": {
+        "$ref": "server_to_client.json"
+      }
+    }
+  },
+  "additionalProperties": false,
+  "required": [
+    "messages"
+  ]
 }