diff --git a/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/AppServicePlans.json b/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/AppServicePlans.json
index 3edcb8105f79..645eeaf43579 100644
--- a/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/AppServicePlans.json
+++ b/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/AppServicePlans.json
@@ -366,6 +366,52 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/serverfarms/{name}/getrdppassword": {
+      "post": {
+        "tags": [
+          "AppServicePlans"
+        ],
+        "summary": "Get the RDP password for an IsCustomMode ServerFarm.",
+        "description": "Description for Get the RDP password for an IsCustomMode ServerFarm.",
+        "operationId": "AppServicePlans_GetServerFarmRdpPassword",
+        "parameters": [
+          {
+            "$ref": "#/parameters/resourceGroupNameParameter"
+          },
+          {
+            "name": "name",
+            "in": "path",
+            "description": "Name of the App Service plan.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "$ref": "#/parameters/subscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK.",
+            "schema": {
+              "$ref": "#/definitions/ServerFarmRdpDetails"
+            }
+          },
+          "404": {
+            "description": "Server farm not found.",
+            "x-ms-error-response": true
+          },
+          "default": {
+            "description": "App Service error response.",
+            "schema": {
+              "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
+            }
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/serverfarms/{name}/hybridConnectionNamespaces/{namespaceName}/relays/{relayName}": {
       "get": {
         "tags": [
@@ -678,6 +724,52 @@
         }
       }
     },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/serverfarms/{name}/instances": {
+      "get": {
+        "tags": [
+          "AppServicePlans"
+        ],
+        "summary": "Get the instance details for an app service plan.",
+        "description": "Description for Get the instance details for an app service plan.",
+        "operationId": "AppServicePlans_GetServerFarmInstanceDetails",
+        "parameters": [
+          {
+            "$ref": "#/parameters/resourceGroupNameParameter"
+          },
+          {
+            "name": "name",
+            "in": "path",
+            "description": "Name of the App Service plan.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "$ref": "#/parameters/subscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK.",
+            "schema": {
+              "$ref": "#/definitions/ServerFarmInstanceDetails"
+            }
+          },
+          "404": {
+            "description": "Server farm not found.",
+            "x-ms-error-response": true
+          },
+          "default": {
+            "description": "App Service error response.",
+            "schema": {
+              "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
+            }
+          }
+        }
+      }
+    },
     "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/serverfarms/{name}/restartSites": {
       "post": {
         "tags": [
@@ -1455,6 +1547,59 @@
           }
         }
       }
+    },
+    "/subscriptions/{subscriptionId}/resourceGroups/{resourceGroupName}/providers/Microsoft.Web/serverfarms/{name}/workers/{workerName}/recycleinstance": {
+      "post": {
+        "tags": [
+          "AppServicePlans"
+        ],
+        "summary": "Recycles a managed instance worker machine.",
+        "description": "Description for Recycles a managed instance worker machine.",
+        "operationId": "AppServicePlans_RecycleManagedInstanceWorker",
+        "parameters": [
+          {
+            "$ref": "#/parameters/resourceGroupNameParameter"
+          },
+          {
+            "name": "name",
+            "in": "path",
+            "description": "Name of the App Service plan.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "name": "workerName",
+            "in": "path",
+            "description": "Name of worker machine.",
+            "required": true,
+            "type": "string"
+          },
+          {
+            "$ref": "#/parameters/subscriptionIdParameter"
+          },
+          {
+            "$ref": "#/parameters/apiVersionParameter"
+          }
+        ],
+        "responses": {
+          "200": {
+            "description": "OK",
+            "schema": {
+              "$ref": "./CommonDefinitions.json#/definitions/Operation"
+            }
+          },
+          "404": {
+            "description": "Server farm not found.",
+            "x-ms-error-response": true
+          },
+          "default": {
+            "description": "App Service error response.",
+            "schema": {
+              "$ref": "./CommonDefinitions.json#/definitions/DefaultErrorResponse"
+            }
+          }
+        }
+      }
     }
   },
   "definitions": {
@@ -1724,6 +1869,73 @@
           "readOnly": true
         }
       }
+    },
+    "ServerFarmInstance": {
+      "description": "Represents details of a single instance in a server farm.",
+      "type": "object",
+      "properties": {
+        "instanceName": {
+          "description": "The instance name.",
+          "type": "string"
+        },
+        "ipAddress": {
+          "description": "The instance IP address.",
+          "type": "string"
+        },
+        "status": {
+          "description": "The instance status.",
+          "type": "string"
+        }
+      }
+    },
+    "ServerFarmInstanceDetails": {
+      "description": "Represents instance details for an app service plan.",
+      "type": "object",
+      "allOf": [
+        {
+          "$ref": "./CommonDefinitions.json#/definitions/ProxyOnlyResource"
+        }
+      ],
+      "properties": {
+        "properties": {
+          "description": "ServerFarmInstanceDetails resource specific properties",
+          "type": "object",
+          "properties": {
+            "serverFarmName": {
+              "description": "The server farm name.",
+              "type": "string"
+            },
+            "instances": {
+              "description": "The list of server farm instances.",
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/ServerFarmInstance"
+              }
+            },
+            "instanceCount": {
+              "format": "int32",
+              "description": "The total number of instances.",
+              "type": "integer"
+            }
+          },
+          "x-ms-client-flatten": true
+        }
+      }
+    },
+    "ServerFarmRdpDetails": {
+      "description": "Server Farm RDP connection details.",
+      "type": "object",
+      "properties": {
+        "rdpPassword": {
+          "description": "The RDP password for the server farm.",
+          "type": "string"
+        },
+        "rdpPasswordExpiry": {
+          "format": "date-time",
+          "description": "The RDP password expiry date.",
+          "type": "string"
+        }
+      }
     }
   },
   "parameters": {
diff --git a/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/CommonDefinitions.json b/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/CommonDefinitions.json
index 79977e6c4387..95abe382a502 100644
--- a/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/CommonDefinitions.json
+++ b/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/CommonDefinitions.json
@@ -387,6 +387,43 @@
             "asyncScalingEnabled": {
               "description": "If <code>true</code>, this App Service Plan will attempt to scale asynchronously if there are insufficient workers to scale synchronously.\nIf <code>false</code>, this App Service Plan will only attempt sync scaling.",
               "type": "boolean"
+            },
+            "planDefaultIdentity": {
+              "$ref": "#/definitions/DefaultIdentity",
+              "description": "Identity to use by platform for various features and integrations using managed identity."
+            },
+            "isCustomMode": {
+              "description": "Whether this server farm is in custom mode.",
+              "type": "boolean"
+            },
+            "registryAdapters": {
+              "description": "Registry adapters associated with this App Service plan.",
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/RegistryAdapter"
+              }
+            },
+            "installScripts": {
+              "description": "Install scripts associated with this App Service plan.",
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/InstallScript"
+              }
+            },
+            "network": {
+              "description": "All network settings for the server farm.",
+              "$ref": "#/definitions/ServerFarmNetworkSettings"
+            },
+            "storageMounts": {
+              "description": "Storage mounts associated with this App Service plan.",
+              "type": "array",
+              "items": {
+                "$ref": "#/definitions/StorageMount"
+              }
+            },
+            "rdpEnabled": {
+              "description": "If <code>true</code>, RDP access is enabled for this App Service plan. Only applicable for IsCustomMode ASPs.\nIf <code>false</code>, RDP access is disabled.",
+              "type": "boolean"
             }
           },
           "x-ms-client-flatten": true
@@ -394,6 +431,9 @@
         "sku": {
           "$ref": "#/definitions/SkuDescription"
         },
+        "identity": {
+          "$ref": "#/definitions/ManagedServiceIdentity"
+        },
         "extendedLocation": {
           "$ref": "#/definitions/ExtendedLocation"
         }
@@ -1578,6 +1618,26 @@
         }
       }
     },
+    "DefaultIdentity": {
+      "type": "object",
+      "properties": {
+        "identityType": {
+          "enum": [
+            "None",
+            "SystemAssigned",
+            "UserAssigned"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "ManagedServiceIdentityType",
+            "modelAsString": false
+          }
+        },
+        "userAssignedIdentityResourceId": {
+          "type": "string"
+        }
+      }
+    },
     "DeletedSite": {
       "description": "A deleted app.",
       "type": "object",
@@ -2255,6 +2315,42 @@
         }
       }
     },
+    "InstallScript": {
+      "description": "Server farm install script configuration.",
+      "type": "object",
+      "properties": {
+        "name": {
+          "description": "Name of the install script.",
+          "type": "string"
+        },
+        "source": {
+          "$ref": "#/definitions/InstallScriptSource",
+          "description": "Source of the install script."
+        }
+      }
+    },
+    "InstallScriptSource": {
+      "description": "Object to hold install script reference.",
+      "type": "object",
+      "properties": {
+        "sourceUri": {
+          "description": "Install script source URI where the install script file will be fetched from.",
+          "type": "string"
+        },
+        "type": {
+          "description": "Type of the install script.",
+          "enum": [
+            "RemoteAzureBlob",
+            "PlatformStorage"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "InstallScriptType",
+            "modelAsString": true
+          }
+        }
+      }
+    },
     "IpSecurityRestriction": {
       "description": "IP security restriction on an app.",
       "type": "object",
@@ -2336,6 +2432,20 @@
         }
       }
     },
+    "KeyVaultReferenceWithStatus": {
+      "description": "Object to hold key vault reference and the resolution status",
+      "type": "object",
+      "properties": {
+        "secretUri": {
+          "description": "Key vault secret URI.",
+          "type": "string"
+        },
+        "referenceStatus": {
+          "description": "Reference status of the key vault secret.",
+          "type": "string"
+        }
+      }
+    },
     "KubeEnvironmentProfile": {
       "description": "Specification for a Kubernetes Environment to use for this resource.",
       "type": "object",
@@ -2888,6 +2998,36 @@
         }
       }
     },
+    "RegistryAdapter": {
+      "description": "Server farm registry adapter configuration.",
+      "type": "object",
+      "properties": {
+        "registryKey": {
+          "description": "Registry key for the adapter.",
+          "type": "string"
+        },
+        "type": {
+          "description": "Type of the registry adapter.",
+          "enum": [
+            "Binary",
+            "String",
+            "Expand_String",
+            "Multi_String",
+            "DWord",
+            "QWord"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "RegistryAdapterType",
+            "modelAsString": true
+          }
+        },
+        "keyVaultSecretReference": {
+          "$ref": "#/definitions/KeyVaultReferenceWithStatus",
+          "description": "Key vault reference to the value that will be placed in the registry location"
+        }
+      }
+    },
     "RemotePrivateEndpointConnectionARMResource": {
       "description": "Remote Private Endpoint Connection ARM resource.",
       "type": "object",
@@ -4280,6 +4420,16 @@
         }
       }
     },
+    "ServerFarmNetworkSettings": {
+      "description": "Network settings for an app service plan.",
+      "type": "object",
+      "properties": {
+        "virtualNetworkSubnetId": {
+          "description": "Azure Resource Manager ID of the Virtual network and subnet to be joined by Regional VNET Integration. This must be of the form /subscriptions/{subscriptionName}/resourceGroups/{resourceGroupName}/providers/Microsoft.Network/virtualNetworks/{vnetName}/subnets/{subnetName}",
+          "type": "string"
+        }
+      }
+    },
     "SiteLimits": {
       "description": "Metric limits set on an app.",
       "type": "object",
@@ -4550,6 +4700,41 @@
         }
       }
     },
+    "StorageMount": {
+      "description": "Server farm storage mount configuration.",
+      "type": "object",
+      "properties": {
+        "name": {
+          "description": "Name of the storage mount.",
+          "type": "string"
+        },
+        "type": {
+          "description": "Type of the storage mount.",
+          "enum": [
+            "AzureFiles",
+            "LocalStorage",
+            "FileShare"
+          ],
+          "type": "string",
+          "x-ms-enum": {
+            "name": "StorageMountType",
+            "modelAsString": true
+          }
+        },
+        "source": {
+          "description": "Source of the fileshare/storage.",
+          "type": "string"
+        },
+        "destinationPath": {
+          "description": "Path on worker where storage will be mounted.",
+          "type": "string"
+        },
+        "credentialsKeyVaultReference": {
+          "$ref": "#/definitions/KeyVaultReferenceWithStatus",
+          "description": "KV reference to the credentials to connect to the share."
+        }
+      }
+    },
     "StringDictionary": {
       "description": "String dictionary resource.",
       "type": "object",
diff --git a/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/ResourceProvider.json b/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/ResourceProvider.json
index c8527c983dd5..2d985b253cf5 100644
--- a/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/ResourceProvider.json
+++ b/specification/web/resource-manager/Microsoft.Web/AppService/stable/2025-03-01/ResourceProvider.json
@@ -417,6 +417,12 @@
             "description": "Specify <code>true</code> if you want to filter to only regions that support Linux Consumption Workers.",
             "type": "boolean"
           },
+          {
+            "name": "customModeWorkersEnabled ",
+            "in": "query",
+            "description": "Specify <code>true</code> if you want to filter to only regions that support App Service Plans with <code>IsCustomMode</code> set to <code>true</code>.",
+            "type": "boolean"
+          },
           {
             "$ref": "#/parameters/subscriptionIdParameter"
           },