fix: address rpc and mcp review followups

tests/wf_mcp/service/conftest.py

@@ -28,8 +28,8 @@ class ContentOnlyOutputAdapter(FakeAdapter):
 
     async def list_tools(
         self,
-        connection,
-        auth,
+        connection: ConnectionConfig,
+        auth: AuthRecord | None,
     ) -> list[DiscoveredTool]:
         return [
             DiscoveredTool(
@@ -51,8 +51,8 @@ class ContentOnlyOutputAdapter(FakeAdapter):
 
     async def call_tool(
         self,
-        connection,
-        auth,
+        connection: ConnectionConfig,
+        auth: AuthRecord | None,
         tool_name: str,
         payload: dict[str, Any],
     ) -> ToolCallResult: