Add usage to context in streaming

src/agents/result.py

@@ -15,6 +15,7 @@
 from .guardrail import InputGuardrailResult, OutputGuardrailResult
 from .items import ItemHelpers, ModelResponse, RunItem, TResponseInputItem
 from .logger import logger
+from .run_context import RunContextWrapper
 from .stream_events import StreamEvent
 from .tracing import Trace
 from .util._pretty_print import pretty_print_result, pretty_print_run_result_streaming
@@ -50,6 +51,9 @@ class RunResultBase(abc.ABC):
     output_guardrail_results: list[OutputGuardrailResult]
     """Guardrail results for the final output of the agent."""
 
+    context_wrapper: RunContextWrapper[Any]
+    """The context wrapper for the agent run."""
+
     @property
     @abc.abstractmethod
     def last_agent(self) -> Agent[Any]:
@@ -75,9 +79,7 @@ def final_output_as(self, cls: type[T], raise_if_incorrect_type: bool = False) -
 
     def to_input_list(self) -> list[TResponseInputItem]:
         """Creates a new input list, merging the original input with all the new items generated."""
-        original_items: list[TResponseInputItem] = ItemHelpers.input_to_new_input_list(
-            self.input
-        )
+        original_items: list[TResponseInputItem] = ItemHelpers.input_to_new_input_list(self.input)
         new_items = [item.to_input_item() for item in self.new_items]
 
         return original_items + new_items
@@ -206,17 +208,13 @@ async def stream_events(self) -> AsyncIterator[StreamEvent]:
 
     def _check_errors(self):
         if self.current_turn > self.max_turns:
-            self._stored_exception = MaxTurnsExceeded(
-                f"Max turns ({self.max_turns}) exceeded"
-            )
+            self._stored_exception = MaxTurnsExceeded(f"Max turns ({self.max_turns}) exceeded")
 
         # Fetch all the completed guardrail results from the queue and raise if needed
         while not self._input_guardrail_queue.empty():
             guardrail_result = self._input_guardrail_queue.get_nowait()
             if guardrail_result.output.tripwire_triggered:
-                self._stored_exception = InputGuardrailTripwireTriggered(
-                    guardrail_result
-                )
+                self._stored_exception = InputGuardrailTripwireTriggered(guardrail_result)
 
         # Check the tasks for any exceptions
         if self._run_impl_task and self._run_impl_task.done():

src/agents/run.py

@@ -270,6 +270,7 @@ async def run(
                             _last_agent=current_agent,
                             input_guardrail_results=input_guardrail_results,
                             output_guardrail_results=output_guardrail_results,
+                            context_wrapper=context_wrapper,
                         )
                     elif isinstance(turn_result.next_step, NextStepHandoff):
                         current_agent = cast(Agent[TContext], turn_result.next_step.new_agent)
@@ -423,6 +424,7 @@ def run_streamed(
             output_guardrail_results=[],
             _current_agent_output_schema=output_schema,
             trace=new_trace,
+            context_wrapper=context_wrapper,
         )
 
         # Kick off the actual agent loop in the background and return the streamed result object.
@@ -696,6 +698,7 @@ async def _run_single_turn_streamed(
                     usage=usage,
                     response_id=event.response.id,
                 )
+                context_wrapper.usage.add(usage)
 
             streamed_result._event_queue.put_nowait(RawResponsesStreamEvent(data=event))
 

tests/fake_model.py

@@ -3,7 +3,8 @@
 from collections.abc import AsyncIterator
 from typing import Any
 
-from openai.types.responses import Response, ResponseCompletedEvent
+from openai.types.responses import Response, ResponseCompletedEvent, ResponseUsage
+from openai.types.responses.response_usage import InputTokensDetails, OutputTokensDetails
 
 from agents.agent_output import AgentOutputSchemaBase
 from agents.handoffs import Handoff
@@ -33,6 +34,10 @@ def __init__(
         )
         self.tracing_enabled = tracing_enabled
         self.last_turn_args: dict[str, Any] = {}
+        self.hardcoded_usage: Usage | None = None
+
+    def set_hardcoded_usage(self, usage: Usage):
+        self.hardcoded_usage = usage
 
     def set_next_output(self, output: list[TResponseOutputItem] | Exception):
         self.turn_outputs.append(output)
@@ -83,7 +88,7 @@ async def get_response(
 
             return ModelResponse(
                 output=output,
-                usage=Usage(),
+                usage=self.hardcoded_usage or Usage(),
                 response_id=None,
             )
 
@@ -123,13 +128,14 @@ async def stream_response(
 
             yield ResponseCompletedEvent(
                 type="response.completed",
-                response=get_response_obj(output),
+                response=get_response_obj(output, usage=self.hardcoded_usage),
             )
 
 
 def get_response_obj(
     output: list[TResponseOutputItem],
     response_id: str | None = None,
+    usage: Usage | None = None,
 ) -> Response:
     return Response(
         id=response_id or "123",
@@ -141,4 +147,11 @@ def get_response_obj(
         tools=[],
         top_p=None,
         parallel_tool_calls=False,
+        usage=ResponseUsage(
+            input_tokens=usage.input_tokens if usage else 0,
+            output_tokens=usage.output_tokens if usage else 0,
+            total_tokens=usage.total_tokens if usage else 0,
+            input_tokens_details=InputTokensDetails(cached_tokens=0),
+            output_tokens_details=OutputTokensDetails(reasoning_tokens=0),
+        ),
     )

tests/test_result_cast.py

@@ -3,7 +3,7 @@
 import pytest
 from pydantic import BaseModel
 
-from agents import Agent, RunResult
+from agents import Agent, RunContextWrapper, RunResult
 
 
 def create_run_result(final_output: Any) -> RunResult:
@@ -15,6 +15,7 @@ def create_run_result(final_output: Any) -> RunResult:
         input_guardrail_results=[],
         output_guardrail_results=[],
         _last_agent=Agent(name="test"),
+        context_wrapper=RunContextWrapper(context=None),
     )