diff --git a/dbt/adapters/contracts/relation.py b/dbt/adapters/contracts/relation.py
index 3028bd0f6..b9836d061 100644
--- a/dbt/adapters/contracts/relation.py
+++ b/dbt/adapters/contracts/relation.py
@@ -38,7 +38,7 @@ class MaterializationConfig(Mapping, ABC):
     on_schema_change: Optional[str]
     on_configuration_change: OnConfigurationChangeOption
     contract: MaterializationContract
-    extra: Dict[str, Any]
+    _extra: Dict[str, Any]
 
     def __contains__(self, item):
         ...
@@ -48,6 +48,7 @@ def __delitem__(self, key):
 
 
 class RelationConfig(Protocol):
+    resource_type: str
     name: str
     database: str
     schema: str
@@ -55,6 +56,8 @@ class RelationConfig(Protocol):
     compiled_code: Optional[str]
     quoting_dict: Dict[str, bool]
     config: Optional[MaterializationConfig]
+    meta: Dict[str, Any]
+    tags: List[str]
 
 
 class ComponentName(StrEnum):