diff --git a/deepsearch/model/examples/dummy_qa_generator/model.py b/deepsearch/model/examples/dummy_qa_generator/model.py
index 04666a24..2f3b0419 100644
--- a/deepsearch/model/examples/dummy_qa_generator/model.py
+++ b/deepsearch/model/examples/dummy_qa_generator/model.py
@@ -1,8 +1,12 @@
-from typing import Dict, List, Tuple
+from typing import Any, Dict, List, Tuple
 
 from deepsearch.model.base.types import Kind
 from deepsearch.model.kinds.qagen.model import BaseQAGenerator
-from deepsearch.model.kinds.qagen.types import GenerateAnswersOutput, QAGenConfig
+from deepsearch.model.kinds.qagen.types import (
+    GenerateAnswersOutEntry,
+    GenerateAnswersOutput,
+    QAGenConfig,
+)
 
 
 class DummyQAGenerator(BaseQAGenerator):
@@ -18,10 +22,19 @@ def get_qagen_config(self) -> QAGenConfig:
         return self._config
 
     def generate_answers(
-        self, texts: List[Tuple[List[Dict], str]]
+        self,
+        texts: List[Tuple[List[Dict], str]],
+        extras: Dict[str, Any],
     ) -> GenerateAnswersOutput:
         """Just answers with the question itself.
         Args:
             texts: a list of context, question pairs.
+            extras: any extras to pass.
         """
-        return [question for _, question in texts]
+        return [
+            GenerateAnswersOutEntry(
+                answer=question,
+                metadata={"foo": "bar"},
+            )
+            for _, question in texts
+        ]
diff --git a/deepsearch/model/kinds/qagen/controller.py b/deepsearch/model/kinds/qagen/controller.py
index b43e87ca..99ee138a 100644
--- a/deepsearch/model/kinds/qagen/controller.py
+++ b/deepsearch/model/kinds/qagen/controller.py
@@ -43,6 +43,7 @@ def dispatch_predict(self, spec: CtrlPredInput) -> CtrlPredOutput:
                     ([ctx_entry.dict() for ctx_entry in ctx_list], q)
                     for ctx_list, q in zip(gen_answers.contexts, gen_answers.questions)
                 ],
+                extras=gen_answers.extras or {},
             )
             return QAGenCtrlPredOutput(
                 answers=answers,
diff --git a/deepsearch/model/kinds/qagen/model.py b/deepsearch/model/kinds/qagen/model.py
index aec3d4e9..d7b9f174 100644
--- a/deepsearch/model/kinds/qagen/model.py
+++ b/deepsearch/model/kinds/qagen/model.py
@@ -1,5 +1,5 @@
 from abc import abstractmethod
-from typing import Dict, List, Tuple
+from typing import Any, Dict, List, Tuple
 
 from deepsearch.model.base.model import BaseDSModel
 from deepsearch.model.base.types import BaseModelConfig
@@ -9,7 +9,7 @@
 class BaseQAGenerator(BaseDSModel):
     @abstractmethod
     def generate_answers(
-        self, texts: List[Tuple[List[Dict], str]]
+        self, texts: List[Tuple[List[Dict], str]], extras: Dict[str, Any]
     ) -> GenerateAnswersOutput:
         raise NotImplementedError()
 
diff --git a/deepsearch/model/kinds/qagen/types.py b/deepsearch/model/kinds/qagen/types.py
index 19e7670e..714eb3c0 100644
--- a/deepsearch/model/kinds/qagen/types.py
+++ b/deepsearch/model/kinds/qagen/types.py
@@ -1,4 +1,4 @@
-from typing import List, Literal
+from typing import Any, Dict, List, Literal, Optional
 
 from pydantic import root_validator
 
@@ -20,6 +20,7 @@ class ContextEntry(StrictModel):
 class GenerateAnswers(StrictModel):
     contexts: List[List[ContextEntry]]
     questions: List[str]
+    extras: Optional[Dict[str, Any]] = None
 
     @root_validator
     def check_lengths_match(cls, values):
@@ -38,7 +39,12 @@ class QAGenAppPredInput(BaseAppPredInput):
     spec: QAGenReqSpec
 
 
-GenerateAnswersOutput = List[str]
+class GenerateAnswersOutEntry(StrictModel):
+    answer: str
+    metadata: Dict[str, Any]
+
+
+GenerateAnswersOutput = List[GenerateAnswersOutEntry]
 
 
 class QAGenCtrlPredOutput(StrictModel):