diff --git a/openapi/openapiv2.json b/openapi/openapiv2.json
index 9a77688f9..ea1ef3f90 100644
--- a/openapi/openapiv2.json
+++ b/openapi/openapiv2.json
@@ -13150,6 +13150,10 @@
         "workflowPause": {
           "type": "boolean",
           "title": "True if the namespace supports pausing workflows"
+        },
+        "standaloneActivities": {
+          "type": "boolean",
+          "title": "True if the namespace supports standalone activities"
         }
       },
       "description": "Namespace capability details. Should contain what features are enabled in a namespace."
diff --git a/openapi/openapiv3.yaml b/openapi/openapiv3.yaml
index f2625c126..e9f459371 100644
--- a/openapi/openapiv3.yaml
+++ b/openapi/openapiv3.yaml
@@ -10262,6 +10262,9 @@ components:
         workflowPause:
           type: boolean
           description: True if the namespace supports pausing workflows
+        standaloneActivities:
+          type: boolean
+          description: True if the namespace supports standalone activities
       description: Namespace capability details. Should contain what features are enabled in a namespace.
     NamespaceInfo_Limits:
       type: object
diff --git a/temporal/api/namespace/v1/message.proto b/temporal/api/namespace/v1/message.proto
index dd864df10..b6f5c4cda 100644
--- a/temporal/api/namespace/v1/message.proto
+++ b/temporal/api/namespace/v1/message.proto
@@ -40,6 +40,8 @@ message NamespaceInfo {
         bool reported_problems_search_attribute = 5;
         // True if the namespace supports pausing workflows
         bool workflow_pause = 6;
+        // True if the namespace supports standalone activities
+        bool standalone_activities = 7;
     }
 
     // Namespace configured limits