diff --git a/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/createOrUpdateModule.json b/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/createOrUpdateModule.json
index 5206e85304bd..ca45683fed14 100644
--- a/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/createOrUpdateModule.json
+++ b/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/createOrUpdateModule.json
@@ -39,7 +39,8 @@
                         "code": null,
                         "message": null
                     },
-                    "provisioningState": "Creating"
+                    "provisioningState": "Creating",
+                    "isComposite": false 
                 }
             }
         },
@@ -63,7 +64,8 @@
                         "code": null,
                         "message": null
                     },
-                    "provisioningState": "Creating"
+                    "provisioningState": "Creating",
+                    "isComposite": false 
                 }
             }
         }
diff --git a/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/getActivityInAModule.json b/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/getActivityInAModule.json
index f4e09b2f842d..0c81f3c2c539 100644
--- a/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/getActivityInAModule.json
+++ b/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/getActivityInAModule.json
@@ -28,7 +28,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+                                    "validationSet": []    
                                 },
                                 {
                                     "name": "AccountId",
@@ -38,7 +40,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+						            "validationSet": []
                                 },
                                 {
                                     "name": "ApplicationId",
@@ -48,7 +52,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "CertificateThumbprint",
@@ -58,7 +64,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "Credential",
@@ -68,7 +76,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "Environment",
@@ -78,7 +88,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "EnvironmentName",
@@ -88,7 +100,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "SubscriptionId",
@@ -98,7 +112,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": true,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "TenantId",
@@ -108,7 +124,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 }
                             ]
                         },
@@ -123,7 +141,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "Environment",
@@ -133,7 +153,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "EnvironmentName",
@@ -143,7 +165,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "ServicePrincipal",
@@ -153,7 +177,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "SubscriptionId",
@@ -163,7 +189,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": true,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "SubscriptionName",
@@ -173,7 +201,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": true,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "TenantId",
@@ -183,7 +213,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 }
                             ]
                         },
@@ -198,7 +230,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "AccountId",
@@ -208,7 +242,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "ApplicationId",
@@ -218,7 +254,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "CertificateThumbprint",
@@ -228,7 +266,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "Credential",
@@ -238,7 +278,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "Environment",
@@ -248,7 +290,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "EnvironmentName",
@@ -258,7 +302,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "SubscriptionName",
@@ -268,7 +314,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": true,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "TenantId",
@@ -278,7 +326,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 }
                             ]
                         },
@@ -293,7 +343,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "Environment",
@@ -303,7 +355,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "EnvironmentName",
@@ -313,7 +367,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "TenantId",
@@ -323,7 +379,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 }
                             ]
                         },
@@ -338,7 +396,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "AccountId",
@@ -348,7 +408,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "Environment",
@@ -358,7 +420,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "EnvironmentName",
@@ -368,7 +432,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "TenantId",
@@ -378,7 +444,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 }
                             ]
                         },
@@ -393,7 +461,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "CertificateThumbprint",
@@ -403,7 +473,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "Environment",
@@ -413,7 +485,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "EnvironmentName",
@@ -423,7 +497,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "ServicePrincipal",
@@ -433,7 +509,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 },
                                 {
                                     "name": "TenantId",
@@ -443,7 +521,9 @@
                                     "position": -2147483648,
                                     "valueFromPipeline": false,
                                     "valueFromPipelineByPropertyName": false,
-                                    "valueFromRemainingArguments": false
+                                    "valueFromRemainingArguments": false,
+                                    "description": "Specify the feature description",  
+									"validationSet": []
                                 }
                             ]
                         }
diff --git a/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/getModule.json b/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/getModule.json
index ab440423c835..4fc63ebeeb68 100644
--- a/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/getModule.json
+++ b/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/getModule.json
@@ -27,7 +27,8 @@
             "code": null,
             "message": ""
           },
-          "provisioningState": "Creating"
+          "provisioningState": "Creating",
+          "isComposite": true
         }
       }
     }
diff --git a/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/updateModule.json b/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/updateModule.json
index b46a459d1792..0dc642463be0 100644
--- a/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/updateModule.json
+++ b/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/examples/updateModule.json
@@ -39,7 +39,8 @@
                         "code": null,
                         "message": null
                     },
-                    "provisioningState": "Creating"
+                    "provisioningState": "Creating",
+                    "isComposite": false 
                 }
             }
         }
diff --git a/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/module.json b/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/module.json
index d43150a2c1ef..5c99b4e0eeeb 100644
--- a/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/module.json
+++ b/specification/automation/resource-manager/Microsoft.Automation/stable/2015-10-31/module.json
@@ -636,7 +636,18 @@
         "valueFromRemainingArguments": {
           "type": "boolean",
           "description": "Gets or sets a Boolean value that indicates true if the cmdlet parameter accepts all the remaining command-line arguments that are associated with this parameter in the form of an array. false if the cmdlet parameter does not accept all the remaining argument values."
-        }
+        },
+        "description": { 
+          "type": "string", 
+          "description": "Gets or sets the description of the activity parameter." 
+         }, 
+        "validationSet": { 
+          "type": "array", 
+          "items": { 
+          "$ref": "#/definitions/ActivityParameterValidationSet" 
+           }, 
+           "description": "Gets or sets the validation set of activity parameter." 
+         }
       },
       "description": "Definition of the activity parameter."
     },
@@ -656,6 +667,15 @@
       },
       "description": "Definition of the activity parameter set."
     },
+    "ActivityParameterValidationSet": { 
+			"properties": { 
+				"memberValue": { 
+					"type": "string", 
+					"description": "Gets or sets the name of the activity parameter validation set member." 
+				} 
+		    }, 
+			  "description": "Definition of the activity parameter validation set." 
+		}, 
     "ActivityOutputType": {
       "properties": {
         "name": {
@@ -915,7 +935,11 @@
         "description": {
           "type": "string",
           "description": "Gets or sets the description."
-        }
+        },
+        "isComposite": {  
+          "type": "boolean", 
+          "description": "Gets or sets type of module, if its composite or not." 
+         }
       },
       "description": "Definition of the module property type."
     },
diff --git a/specification/automation/resource-manager/readme.md b/specification/automation/resource-manager/readme.md
index f6e2d7b056f8..a54a3407f78b 100644
--- a/specification/automation/resource-manager/readme.md
+++ b/specification/automation/resource-manager/readme.md
@@ -247,6 +247,15 @@ Please also specify `--go-sdk-folder=<path to the root directory of your azure-s
 output-folder: $(go-sdk-folder)/services/preview/automation/mgmt/2017-05-15-preview/automation
 ```
 
+### Tag: package-2018-01-preview and go
+
+These settings apply only when `--tag=package-2018-01-preview --go` is specified on the command line.
+Please also specify `--go-sdk-folder=<path to the root directory of your azure-sdk-for-go clone>`.
+
+``` yaml $(tag) == 'package-2018-01-preview' && $(go)
+output-folder: $(go-sdk-folder)/services/preview/automation/mgmt/2018-01-preview/automation
+```
+
 ## Java
 
 These settings apply only when `--java` is specified on the command line.