diff --git a/common.proto b/common.proto
index 4af9061..e917787 100644
--- a/common.proto
+++ b/common.proto
@@ -16,14 +16,36 @@ message ConfigurationFormResponse {
 }
 
 message FormField {
+  oneof field {
+      Field single = 1;
+      FieldSet field_set = 2;
+  }
+}
+
+message Field {
   string name = 1;
   string label = 2;
   bool required = 3;
   optional string description = 4;
+  optional string default_value = 5;
+  optional string placeholder = 6;
   oneof type {
-    TextField text_field = 5;
-    DropdownField dropdown_field = 6;
-    ToggleField toggle_field = 7;
+    TextField text_field = 7;
+    DropdownField dropdown_field = 8;
+    ToggleField toggle_field = 9;
+  }
+}
+
+message FieldSet {
+  repeated FormField fields = 1;
+  optional VisibilityCondition condition = 2;
+}
+
+message VisibilityCondition {
+  string field_name = 1;
+  oneof condition {
+    bool has_bool_value = 2;
+    string has_string_value = 3;
   }
 }
 
@@ -94,7 +116,7 @@ message DecimalParams {
   uint32 scale = 2;
 }
 
-enum OpType {
+enum RecordType {
   UPSERT = 0;
   UPDATE = 1;
   DELETE = 2;
diff --git a/connector_sdk.proto b/connector_sdk.proto
index 60f4ee4..019a8f5 100644
--- a/connector_sdk.proto
+++ b/connector_sdk.proto
@@ -6,8 +6,8 @@ package fivetran_sdk;
 
 import "common.proto";
 
-// Fivetran (grpc client) <> Connector (grpc server)
-service Connector {
+// Fivetran (grpc client) <> SourceConnector (grpc server)
+service SourceConnector {
     rpc ConfigurationForm (ConfigurationFormRequest) returns (ConfigurationFormResponse) {}
     rpc Test (TestRequest) returns (TestResponse) {}
     rpc Schema (SchemaRequest) returns (SchemaResponse) {}
@@ -65,25 +65,7 @@ message TableSelection {
 }
 
 message UpdateResponse {
-    oneof response {
-        LogEntry log_entry = 1;
-        Operation operation = 2;
-    }
-}
-
-enum LogLevel {
-    INFO = 0;
-    WARNING = 1;
-    SEVERE = 2;
-}
-
-message LogEntry {
-    LogLevel level = 1;
-    string message = 2;
-}
-
-message Operation {
-    oneof op {
+    oneof operation {
         Record record = 1;
         SchemaChange schema_change = 2;
         Checkpoint checkpoint = 3;
@@ -100,7 +82,7 @@ message SchemaChange {
 message Record {
     optional string schema_name = 1;
     string table_name = 2;
-    OpType type = 3;
+    RecordType type = 3;
     map<string, ValueType> data = 4;
 }
 
diff --git a/destination_sdk.proto b/destination_sdk.proto
index d928f43..c8e6c88 100644
--- a/destination_sdk.proto
+++ b/destination_sdk.proto
@@ -7,9 +7,10 @@ package fivetran_sdk;
 import "google/protobuf/timestamp.proto";
 import "common.proto";
 
-// Fivetran (grpc client) <> Destination (grpc server)
-service Destination {
+// Fivetran (grpc client) <> DestinationConnector (grpc server)
+service DestinationConnector {
     rpc ConfigurationForm (ConfigurationFormRequest) returns (ConfigurationFormResponse) {}
+    rpc Capabilities(CapabilitiesRequest) returns (CapabilitiesResponse) {}
     rpc Test (TestRequest) returns (TestResponse) {}
     rpc DescribeTable (DescribeTableRequest) returns (DescribeTableResponse) {}
     rpc CreateTable(CreateTableRequest) returns (CreateTableResponse) {}
@@ -18,6 +19,29 @@ service Destination {
     rpc WriteBatch (WriteBatchRequest) returns (WriteBatchResponse) {}
 }
 
+message CapabilitiesRequest {}
+
+message CapabilitiesResponse {
+    repeated DataTypeMappingEntry data_type_mappings = 1;
+    bool supports_history_mode = 2;
+}
+
+message DataTypeMappingEntry {
+    DataType fivetran_type = 1;
+    oneof destination_type {
+        DestinationType map_to = 2;
+        bool unsupported = 3;
+    }
+}
+
+message DestinationType {
+    string name = 1;
+    oneof mapping {
+        bool keep_same = 2;
+        DataType map_to = 3;
+    }
+}
+
 message DescribeTableRequest {
     map<string, string> configuration = 1;
     string schema_name = 2;
@@ -48,7 +72,25 @@ message CreateTableResponse {
 message AlterTableRequest {
     map<string, string> configuration = 1;
     string schema_name = 2;
-    Table table = 3;
+    string table_name = 3;
+    repeated SchemaChange changes = 4;
+}
+
+message SchemaChange {
+    oneof change {
+        Column add_column = 1;
+        ChangeType change_column_type = 2;
+        PrimaryKey new_primary_key = 3;
+    }
+}
+
+message PrimaryKey {
+    repeated string column_name = 1;
+}
+
+message ChangeType {
+    string column_name = 1;
+    DataType new_type = 2;
 }
 
 message AlterTableResponse {
@@ -82,12 +124,13 @@ message WriteBatchRequest {
     map<string, string> configuration = 1;
     string schema_name = 2;
     Table table = 3;
-    map<string, bytes> keys = 4;
-    repeated string replace_files = 5;
-    repeated string update_files = 6;
-    repeated string delete_files = 7;
+    bool history_mode = 4;
+    map<string, bytes> keys = 5;
+    repeated string replace_files = 6;
+    repeated string update_files = 7;
+    repeated string delete_files = 8;
     oneof file_params {
-        CsvFileParams csv = 8;
+        CsvFileParams csv = 9;
     }
 }