diff --git a/specification/v1_0/json/renderer_to_agent.json b/specification/v1_0/json/renderer_to_agent.json
index 8c121a3df..91f104250 100644
--- a/specification/v1_0/json/renderer_to_agent.json
+++ b/specification/v1_0/json/renderer_to_agent.json
@@ -46,7 +46,22 @@
           "description": "Unique ID for this action call. Only needed if wantResponse is true."
         }
       },
-      "required": ["name", "surfaceId", "sourceComponentId", "timestamp", "context"]
+      "required": ["name", "surfaceId", "sourceComponentId", "timestamp", "context"],
+      "allOf": [
+        {
+          "if": {
+            "properties": {
+              "wantResponse": {
+                "const": true
+              }
+            },
+            "required": ["wantResponse"]
+          },
+          "then": {
+            "required": ["actionId"]
+          }
+        }
+      ]
     },
     "functionResponse": {
       "properties": {
diff --git a/specification/v1_0/test/cases/renderer_messages.json b/specification/v1_0/test/cases/renderer_messages.json
index b2bf49793..0e1238775 100644
--- a/specification/v1_0/test/cases/renderer_messages.json
+++ b/specification/v1_0/test/cases/renderer_messages.json
@@ -17,6 +17,58 @@
         }
       }
     },
+    {
+      "description": "Valid action requesting a response with an actionId",
+      "valid": true,
+      "data": {
+        "version": "v1.0",
+        "action": {
+          "name": "submit",
+          "surfaceId": "main",
+          "sourceComponentId": "btn_submit",
+          "timestamp": "2023-10-27T10:00:00Z",
+          "context": {
+            "foo": "bar"
+          },
+          "wantResponse": true,
+          "actionId": "submit-1"
+        }
+      }
+    },
+    {
+      "description": "Invalid action requesting a response without an actionId",
+      "valid": false,
+      "data": {
+        "version": "v1.0",
+        "action": {
+          "name": "submit",
+          "surfaceId": "main",
+          "sourceComponentId": "btn_submit",
+          "timestamp": "2023-10-27T10:00:00Z",
+          "context": {
+            "foo": "bar"
+          },
+          "wantResponse": true
+        }
+      }
+    },
+    {
+      "description": "Valid action not requesting a response without an actionId",
+      "valid": true,
+      "data": {
+        "version": "v1.0",
+        "action": {
+          "name": "submit",
+          "surfaceId": "main",
+          "sourceComponentId": "btn_submit",
+          "timestamp": "2023-10-27T10:00:00Z",
+          "context": {
+            "foo": "bar"
+          },
+          "wantResponse": false
+        }
+      }
+    },
     {
       "description": "Valid error message (validation failed)",
       "valid": true,