diff --git a/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.AVS/AVS.tsp b/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.AVS/AVS.tsp
index b927d21690ed..29540ff1d4d2 100644
--- a/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.AVS/AVS.tsp
+++ b/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.AVS/AVS.tsp
@@ -74,12 +74,15 @@ model AvsClusterEventData {
   operationId: string;
 
   /** Hosts added to the cluster in this event, if any. */
+  @visibility(Lifecycle.Read)
   addedHostNames?: string[];
 
   /** Hosts removed from the cluster in this event, if any. */
+  @visibility(Lifecycle.Read)
   removedHostNames?: string[];
 
   /** Hosts in Maintenance mode in the cluster, if any. */
+  @visibility(Lifecycle.Read)
   inMaintenanceHostNames?: string[];
 }
 
@@ -92,5 +95,6 @@ model AvsScriptExecutionEventData {
   cmdletId: string;
 
   /** Stdout outputs from the execution, if any. */
+  @visibility(Lifecycle.Read)
   output?: string[];
 }
diff --git a/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.Communication/AzureCommunicationServices.tsp b/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.Communication/AzureCommunicationServices.tsp
index 14097496c338..6804e14d2b22 100644
--- a/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.Communication/AzureCommunicationServices.tsp
+++ b/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.Communication/AzureCommunicationServices.tsp
@@ -202,6 +202,7 @@ model AcsSmsDeliveryReportReceivedEventData extends AcsSmsEventBaseProperties {
   deliveryStatusDetails?: string;
 
   /** List of details of delivery attempts made */
+  @visibility(Lifecycle.Read)
   deliveryAttempts: AcsSmsDeliveryAttemptProperties[];
 
   /** The time at which the SMS delivery report was received */
@@ -324,6 +325,7 @@ model AcsRouterJobClassificationFailedEventData extends AcsRouterJobEventData {
   classificationPolicyId?: string;
 
   /** Router Job Classification Failed Errors */
+  @visibility(Lifecycle.Read)
   errors: AcsRouterCommunicationError[];
 }
 
@@ -340,6 +342,7 @@ model AcsRouterJobClassifiedEventData extends AcsRouterJobEventData {
   priority?: int32;
 
   /** Router Job Attached Worker Selector */
+  @visibility(Lifecycle.Read)
   attachedWorkerSelectors: AcsRouterWorkerSelector[];
 }
 
@@ -387,9 +390,11 @@ model AcsRouterJobQueuedEventData extends AcsRouterJobEventData {
   priority?: int32;
 
   /** Router Job Queued Attached Worker Selector */
+  @visibility(Lifecycle.Read)
   attachedWorkerSelectors: AcsRouterWorkerSelector[];
 
   /** Router Job Queued Requested Worker Selector */
+  @visibility(Lifecycle.Read)
   requestedWorkerSelectors: AcsRouterWorkerSelector[];
 }
 
@@ -407,6 +412,7 @@ model AcsRouterJobReceivedEventData extends AcsRouterJobEventData {
   priority?: int32;
 
   /** Router Job Received Requested Worker Selectors */
+  @visibility(Lifecycle.Read)
   requestedWorkerSelectors: AcsRouterWorkerSelector[];
 
   /** Router Job Received Scheduled Time in UTC */
@@ -465,9 +471,11 @@ model AcsRouterJobSchedulingFailedEventData extends AcsRouterJobEventData {
   priority?: int32;
 
   /** Router Job Scheduling Failed Attached Worker Selector Expired */
+  @visibility(Lifecycle.Read)
   expiredAttachedWorkerSelectors: AcsRouterWorkerSelector[];
 
   /** Router Job Scheduling Failed Requested Worker Selector Expired */
+  @visibility(Lifecycle.Read)
   expiredRequestedWorkerSelectors: AcsRouterWorkerSelector[];
 
   /** Router Job Scheduling Failed Scheduled Time in UTC */
@@ -496,9 +504,11 @@ model AcsRouterJobWaitingForActivationEventData extends AcsRouterJobEventData {
   priority?: int32;
 
   /** Router Job Waiting For Activation Worker Selector Expired */
+  @visibility(Lifecycle.Read)
   expiredAttachedWorkerSelectors: AcsRouterWorkerSelector[];
 
   /** Router Job Waiting For Activation Requested Worker Selector Expired */
+  @visibility(Lifecycle.Read)
   expiredRequestedWorkerSelectors: AcsRouterWorkerSelector[];
 
   /** Router Job Waiting For Activation Scheduled Time in UTC */
@@ -515,9 +525,11 @@ model AcsRouterJobWaitingForActivationEventData extends AcsRouterJobEventData {
 model AcsRouterJobWorkerSelectorsExpiredEventData
   extends AcsRouterJobEventData {
   /** Router Job Worker Selectors Expired Requested Worker Selectors */
+  @visibility(Lifecycle.Read)
   expiredRequestedWorkerSelectors: AcsRouterWorkerSelector[];
 
   /** Router Job Worker Selectors Expired Attached Worker Selectors */
+  @visibility(Lifecycle.Read)
   expiredAttachedWorkerSelectors: AcsRouterWorkerSelector[];
 }
 
@@ -630,9 +642,11 @@ model AcsRouterWorkerRegisteredEventData {
   workerId?: string;
 
   /** Router Worker Registered Queue Info */
+  @visibility(Lifecycle.Read)
   queueAssignments: AcsRouterQueueDetails[];
 
   /** Router Worker Registered Channel Configuration */
+  @visibility(Lifecycle.Read)
   channelConfigurations: AcsRouterChannelConfiguration[];
 
   /** Router Worker Register Total Capacity */
@@ -717,7 +731,8 @@ model AcsRouterCommunicationError {
   innererror: AcsRouterCommunicationError;
 
   /** List of Router Communication Errors */
-  details: AcsRouterCommunicationError[];
+  @visibility(Lifecycle.Read)
+  errors: AcsRouterCommunicationError[];
 }
 
 /** Router Job Worker Selector */
@@ -765,6 +780,7 @@ alias AcsChatThreadBaseEventData = {
   metadata: Record<string>;
 
   /** The list of properties of participants who are part of the thread */
+  @visibility(Lifecycle.Read)
   participants: AcsChatThreadParticipantProperties[];
 };
 
@@ -1034,6 +1050,7 @@ model AcsSmsDeliveryAttemptProperties {
 /** Schema for all properties of Recording Storage Information. */
 model AcsRecordingStorageInfoProperties {
   /** List of details of recording chunks information */
+  @visibility(Lifecycle.Read)
   recordingChunks: AcsRecordingChunkInfoProperties[];
 }
 
@@ -1158,9 +1175,11 @@ model AcsRouterWorkerUpdatedEventData {
   workerId?: string;
 
   /** Router Worker Updated Queue Info */
+  @visibility(Lifecycle.Read)
   queueAssignments: AcsRouterQueueDetails[];
 
   /** Router Worker Updated Channel Configuration */
+  @visibility(Lifecycle.Read)
   channelConfigurations: AcsRouterChannelConfiguration[];
 
   /** Router Worker Updated Total Capacity */
@@ -1173,6 +1192,7 @@ model AcsRouterWorkerUpdatedEventData {
   tags: Record<string>;
 
   /** Router Worker Properties Updated */
+  @visibility(Lifecycle.Read)
   updatedWorkerProperties: AcsRouterUpdatedWorkerProperty[];
 }
 
diff --git a/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.Maps/Maps.tsp b/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.Maps/Maps.tsp
index 50152988bcd9..bca9240b377a 100644
--- a/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.Maps/Maps.tsp
+++ b/specification/eventgrid/Azure.Messaging.EventGrid.SystemEvents/Microsoft.Maps/Maps.tsp
@@ -18,12 +18,15 @@ model MapsGeofenceResultEventData extends MapsGeofenceEventProperties {}
 /** Schema of the Data property of an EventGridEvent for a Geofence event (GeofenceEntered, GeofenceExited, GeofenceResult). */
 model MapsGeofenceEventProperties {
   /** Lists of the geometry ID of the geofence which is expired relative to the user time in the request. */
+  @visibility(Lifecycle.Read)
   expiredGeofenceGeometryId: string[];
 
   /** Lists the fence geometries that either fully contain the coordinate position or have an overlap with the searchBuffer around the fence. */
+  @visibility(Lifecycle.Read)
   geometries: MapsGeofenceGeometry[];
 
   /** Lists of the geometry ID of the geofence which is in invalid period relative to the user time in the request. */
+  @visibility(Lifecycle.Read)
   invalidPeriodGeofenceGeometryId: string[];
 
   /** True if at least one event is published to the Azure Maps event subscriber, false if no event is published to the Azure Maps event subscriber. */
diff --git a/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2018-01-01/GeneratedSystemEvents.json b/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2018-01-01/GeneratedSystemEvents.json
index 7dfb411d6360..5a4b50fdc693 100644
--- a/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2018-01-01/GeneratedSystemEvents.json
+++ b/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2018-01-01/GeneratedSystemEvents.json
@@ -427,6 +427,7 @@
           "items": {
             "$ref": "#/definitions/AcsChatThreadParticipantProperties"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -468,6 +469,7 @@
           "items": {
             "$ref": "#/definitions/AcsChatThreadParticipantProperties"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -1302,6 +1304,7 @@
           "items": {
             "$ref": "#/definitions/AcsRecordingChunkInfoProperties"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -1349,18 +1352,19 @@
           "$ref": "#/definitions/AcsRouterCommunicationError",
           "description": "Router Communication Inner Error"
         },
-        "details": {
+        "errors": {
           "type": "array",
           "description": "List of Router Communication Errors",
           "items": {
             "$ref": "#/definitions/AcsRouterCommunicationError"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
       "required": [
         "innererror",
-        "details"
+        "errors"
       ]
     },
     "AcsRouterEventData": {
@@ -1414,6 +1418,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterCommunicationError"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -1449,6 +1454,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -1580,6 +1586,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "requestedWorkerSelectors": {
@@ -1588,6 +1595,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -1624,6 +1632,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "scheduledOn": {
@@ -1661,6 +1670,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "expiredRequestedWorkerSelectors": {
@@ -1669,6 +1679,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "scheduledOn": {
@@ -1809,6 +1820,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "expiredRequestedWorkerSelectors": {
@@ -1817,6 +1829,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "scheduledOn": {
@@ -1850,6 +1863,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "expiredAttachedWorkerSelectors": {
@@ -1858,6 +1872,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -2225,7 +2240,8 @@
           "description": "Router Worker Registered Queue Info",
           "items": {
             "$ref": "#/definitions/AcsRouterQueueDetails"
-          }
+          },
+          "readOnly": true
         },
         "channelConfigurations": {
           "type": "array",
@@ -2233,6 +2249,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterChannelConfiguration"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "totalCapacity": {
@@ -2335,7 +2352,8 @@
           "description": "Router Worker Updated Queue Info",
           "items": {
             "$ref": "#/definitions/AcsRouterQueueDetails"
-          }
+          },
+          "readOnly": true
         },
         "channelConfigurations": {
           "type": "array",
@@ -2343,6 +2361,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterChannelConfiguration"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "totalCapacity": {
@@ -2369,7 +2388,8 @@
           "description": "Router Worker Properties Updated",
           "items": {
             "$ref": "#/definitions/AcsRouterUpdatedWorkerProperty"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -2419,6 +2439,7 @@
           "items": {
             "$ref": "#/definitions/AcsSmsDeliveryAttemptProperties"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "receivedTimestamp": {
@@ -3235,21 +3256,24 @@
           "description": "Hosts added to the cluster in this event, if any.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         },
         "removedHostNames": {
           "type": "array",
           "description": "Hosts removed from the cluster in this event, if any.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         },
         "inMaintenanceHostNames": {
           "type": "array",
           "description": "Hosts in Maintenance mode in the cluster, if any.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -3361,7 +3385,8 @@
           "description": "Stdout outputs from the execution, if any.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -6405,7 +6430,8 @@
           "description": "Lists of the geometry ID of the geofence which is expired relative to the user time in the request.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         },
         "geometries": {
           "type": "array",
@@ -6413,6 +6439,7 @@
           "items": {
             "$ref": "#/definitions/MapsGeofenceGeometry"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "invalidPeriodGeofenceGeometryId": {
@@ -6420,7 +6447,8 @@
           "description": "Lists of the geometry ID of the geofence which is in invalid period relative to the user time in the request.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         },
         "isEventPublished": {
           "type": "boolean",
diff --git a/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2023-11-01/EventGrid.json b/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2023-11-01/EventGrid.json
index 37a86b64ad2a..a348f163767d 100644
--- a/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2023-11-01/EventGrid.json
+++ b/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2023-11-01/EventGrid.json
@@ -454,6 +454,7 @@
           "items": {
             "$ref": "#/definitions/FailedLockToken"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "succeededLockTokens": {
@@ -461,7 +462,8 @@
           "description": "Array of lock tokens for the successfully acknowledged cloud events.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -652,6 +654,7 @@
           "items": {
             "$ref": "#/definitions/ReceiveDetails"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -669,6 +672,7 @@
           "items": {
             "$ref": "#/definitions/FailedLockToken"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "succeededLockTokens": {
@@ -676,7 +680,8 @@
           "description": "Array of lock tokens for the successfully rejected cloud events.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -694,6 +699,7 @@
           "items": {
             "$ref": "#/definitions/FailedLockToken"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "succeededLockTokens": {
@@ -701,7 +707,8 @@
           "description": "Array of lock tokens for the successfully released cloud events.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
diff --git a/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2024-01-01/GeneratedSystemEvents.json b/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2024-01-01/GeneratedSystemEvents.json
index 727afcbb0eac..40020e3fa118 100644
--- a/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2024-01-01/GeneratedSystemEvents.json
+++ b/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2024-01-01/GeneratedSystemEvents.json
@@ -441,6 +441,7 @@
           "items": {
             "$ref": "#/definitions/AcsChatThreadParticipantProperties"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -482,6 +483,7 @@
           "items": {
             "$ref": "#/definitions/AcsChatThreadParticipantProperties"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -1345,6 +1347,7 @@
           "items": {
             "$ref": "#/definitions/AcsRecordingChunkInfoProperties"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -1392,18 +1395,19 @@
           "$ref": "#/definitions/AcsRouterCommunicationError",
           "description": "Router Communication Inner Error"
         },
-        "details": {
+        "errors": {
           "type": "array",
           "description": "List of Router Communication Errors",
           "items": {
             "$ref": "#/definitions/AcsRouterCommunicationError"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
       "required": [
         "innererror",
-        "details"
+        "errors"
       ]
     },
     "AcsRouterEventData": {
@@ -1457,6 +1461,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterCommunicationError"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -1492,6 +1497,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -1623,6 +1629,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "requestedWorkerSelectors": {
@@ -1631,6 +1638,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -1667,6 +1675,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "scheduledOn": {
@@ -1706,6 +1715,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "expiredRequestedWorkerSelectors": {
@@ -1714,6 +1724,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "scheduledOn": {
@@ -1855,6 +1866,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "expiredRequestedWorkerSelectors": {
@@ -1863,6 +1875,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "scheduledOn": {
@@ -1897,6 +1910,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "expiredAttachedWorkerSelectors": {
@@ -1905,6 +1919,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterWorkerSelector"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -2274,7 +2289,8 @@
           "description": "Router Worker Registered Queue Info",
           "items": {
             "$ref": "#/definitions/AcsRouterQueueDetails"
-          }
+          },
+          "readOnly": true
         },
         "channelConfigurations": {
           "type": "array",
@@ -2282,6 +2298,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterChannelConfiguration"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "totalCapacity": {
@@ -2387,7 +2404,8 @@
           "description": "Router Worker Updated Queue Info",
           "items": {
             "$ref": "#/definitions/AcsRouterQueueDetails"
-          }
+          },
+          "readOnly": true
         },
         "channelConfigurations": {
           "type": "array",
@@ -2395,6 +2413,7 @@
           "items": {
             "$ref": "#/definitions/AcsRouterChannelConfiguration"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "totalCapacity": {
@@ -2421,7 +2440,8 @@
           "description": "Router Worker Properties Updated",
           "items": {
             "$ref": "#/definitions/AcsRouterUpdatedWorkerProperty"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -2474,6 +2494,7 @@
           "items": {
             "$ref": "#/definitions/AcsSmsDeliveryAttemptProperties"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "receivedTimestamp": {
@@ -3300,21 +3321,24 @@
           "description": "Hosts added to the cluster in this event, if any.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         },
         "removedHostNames": {
           "type": "array",
           "description": "Hosts removed from the cluster in this event, if any.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         },
         "inMaintenanceHostNames": {
           "type": "array",
           "description": "Hosts in Maintenance mode in the cluster, if any.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -3426,7 +3450,8 @@
           "description": "Stdout outputs from the execution, if any.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -6526,7 +6551,8 @@
           "description": "Lists of the geometry ID of the geofence which is expired relative to the user time in the request.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         },
         "geometries": {
           "type": "array",
@@ -6534,6 +6560,7 @@
           "items": {
             "$ref": "#/definitions/MapsGeofenceGeometry"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "invalidPeriodGeofenceGeometryId": {
@@ -6541,7 +6568,8 @@
           "description": "Lists of the geometry ID of the geofence which is in invalid period relative to the user time in the request.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         },
         "isEventPublished": {
           "type": "boolean",
diff --git a/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2024-06-01/EventGrid.json b/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2024-06-01/EventGrid.json
index 655171af6e4f..2e088a536439 100644
--- a/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2024-06-01/EventGrid.json
+++ b/specification/eventgrid/data-plane/Microsoft.EventGrid/stable/2024-06-01/EventGrid.json
@@ -569,6 +569,7 @@
           "items": {
             "$ref": "#/definitions/FailedLockToken"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "succeededLockTokens": {
@@ -576,7 +577,8 @@
           "description": "Array of lock tokens for the successfully acknowledged cloud events.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -767,6 +769,7 @@
           "items": {
             "$ref": "#/definitions/ReceiveDetails"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         }
       },
@@ -784,6 +787,7 @@
           "items": {
             "$ref": "#/definitions/FailedLockToken"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "succeededLockTokens": {
@@ -791,7 +795,8 @@
           "description": "Array of lock tokens for the successfully rejected cloud events.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -809,6 +814,7 @@
           "items": {
             "$ref": "#/definitions/FailedLockToken"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "succeededLockTokens": {
@@ -816,7 +822,8 @@
           "description": "Array of lock tokens for the successfully released cloud events.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [
@@ -834,6 +841,7 @@
           "items": {
             "$ref": "#/definitions/FailedLockToken"
           },
+          "readOnly": true,
           "x-ms-identifiers": []
         },
         "succeededLockTokens": {
@@ -841,7 +849,8 @@
           "description": "Array of lock tokens for the successfully renewed locks.",
           "items": {
             "type": "string"
-          }
+          },
+          "readOnly": true
         }
       },
       "required": [