diff --git a/openapi/openapiv2.json b/openapi/openapiv2.json
index 2a2e82793..b946d03be 100644
--- a/openapi/openapiv2.json
+++ b/openapi/openapiv2.json
@@ -16904,6 +16904,14 @@
         "workflowTaskCompletionPagination": {
           "type": "boolean",
           "description": "True if the namespace supports pagination of `RespondWorkflowTaskCompleted` request."
+        },
+        "standaloneActivityStartDelay": {
+          "type": "boolean",
+          "description": "True if the namespace supports start delay for standalone activities."
+        },
+        "standaloneActivityBatchOperations": {
+          "type": "boolean",
+          "description": "True if the namespace supports batch operations for 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 fed5a15db..5db5443c0 100644
--- a/openapi/openapiv3.yaml
+++ b/openapi/openapiv3.yaml
@@ -13296,6 +13296,12 @@ components:
         workflowTaskCompletionPagination:
           type: boolean
           description: True if the namespace supports pagination of `RespondWorkflowTaskCompleted` request.
+        standaloneActivityStartDelay:
+          type: boolean
+          description: True if the namespace supports start delay for standalone activities.
+        standaloneActivityBatchOperations:
+          type: boolean
+          description: True if the namespace supports batch operations for 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 2dbca4710..e3dd1a235 100644
--- a/temporal/api/namespace/v1/message.proto
+++ b/temporal/api/namespace/v1/message.proto
@@ -60,6 +60,10 @@ message NamespaceInfo {
         bool poller_autoscaling_auto_enroll = 13;
         // True if the namespace supports pagination of `RespondWorkflowTaskCompleted` request.
         bool workflow_task_completion_pagination = 14;
+        // True if the namespace supports start delay for standalone activities.
+        bool standalone_activity_start_delay = 15;
+        // True if the namespace supports batch operations for standalone activities.
+        bool standalone_activity_batch_operations = 16;
     }
 
     // Namespace configured limits