Fix model replacement on looping handoffs

.github/workflows/ci.yml

@@ -55,6 +55,8 @@ jobs:
         with:
           submodules: recursive
       - uses: dtolnay/rust-toolchain@stable
+        with:
+          components: "clippy"
       - uses: Swatinem/rust-cache@v2
         with:
           workspaces: temporalio/bridge -> target

temporalio/contrib/openai_agents/_openai_runner.py

@@ -1,5 +1,4 @@
 import dataclasses
-import json
 import typing
 from typing import Any, Optional, Union
 
@@ -17,14 +16,62 @@
     TResponseInputItem,
 )
 from agents.run import DEFAULT_AGENT_RUNNER, DEFAULT_MAX_TURNS, AgentRunner
-from pydantic_core import to_json
 
 from temporalio import workflow
 from temporalio.contrib.openai_agents._model_parameters import ModelActivityParameters
 from temporalio.contrib.openai_agents._temporal_model_stub import _TemporalModelStub
 from temporalio.contrib.openai_agents.workflow import AgentsWorkflowError
 
 
+# Recursively replace models in all agents
+def _convert_agent(
+    model_params: ModelActivityParameters,
+    agent: Agent[Any],
+    seen: Optional[dict[int, Agent]],
+) -> Agent[Any]:
+    if seen is None:
+        seen = dict()
+
+    # Short circuit if this model was already seen to prevent looping from circular handoffs
+    if id(agent) in seen:
+        return seen[id(agent)]
+
+    # This agent has already been processed in some other run
+    if isinstance(agent.model, _TemporalModelStub):
+        return agent
+
+    # Save the new version of the agent so that we can replace loops
+    new_agent = dataclasses.replace(agent)
+    seen[id(agent)] = new_agent
+
+    name = _model_name(agent)
+
+    new_handoffs: list[Union[Agent, Handoff]] = []
+    for handoff in agent.handoffs:
+        if isinstance(handoff, Agent):
+            new_handoffs.append(_convert_agent(model_params, handoff, seen))
+        elif isinstance(handoff, Handoff):
+            original_invoke = handoff.on_invoke_handoff
+
+            async def on_invoke(context: RunContextWrapper[Any], args: str) -> Agent:
+                handoff_agent = await original_invoke(context, args)
+                return _convert_agent(model_params, handoff_agent, seen)
+
+            new_handoffs.append(
+                dataclasses.replace(handoff, on_invoke_handoff=on_invoke)
+            )
+        else:
+            raise ValueError(f"Unknown handoff type: {type(handoff)}")
+
+    new_agent.model = _TemporalModelStub(
+        model_name=name,
+        model_params=model_params,
+        agent=agent,
+    )
+    new_agent.handoffs = new_handoffs
+    return new_agent
+
+
 class TemporalOpenAIRunner(AgentRunner):
     """Temporal Runner for OpenAI agents.
 
@@ -101,54 +148,9 @@ async def run(
                 ),
             )
 
-        # Recursively replace models in all agents
-        def convert_agent(agent: Agent[Any], seen: Optional[set[int]]) -> Agent[Any]:
-            if seen is None:
-                seen = set()
-
-            # Short circuit if this model was already seen to prevent looping from circular handoffs
-            if id(agent) in seen:
-                return agent
-            seen.add(id(agent))
-
-            # This agent has already been processed in some other run
-            if isinstance(agent.model, _TemporalModelStub):
-                return agent
-
-            name = _model_name(agent)
-
-            new_handoffs: list[Union[Agent, Handoff]] = []
-            for handoff in agent.handoffs:
-                if isinstance(handoff, Agent):
-                    new_handoffs.append(convert_agent(handoff, seen))
-                elif isinstance(handoff, Handoff):
-                    original_invoke = handoff.on_invoke_handoff
-
-                    async def on_invoke(
-                        context: RunContextWrapper[Any], args: str
-                    ) -> Agent:
-                        handoff_agent = await original_invoke(context, args)
-                        return convert_agent(handoff_agent, seen)
-
-                    new_handoffs.append(
-                        dataclasses.replace(handoff, on_invoke_handoff=on_invoke)
-                    )
-                else:
-                    raise ValueError(f"Unknown handoff type: {type(handoff)}")
-
-            return dataclasses.replace(
-                agent,
-                model=_TemporalModelStub(
-                    model_name=name,
-                    model_params=self.model_params,
-                    agent=agent,
-                ),
-                handoffs=new_handoffs,
-            )
-
         try:
             return await self._runner.run(
-                starting_agent=convert_agent(starting_agent, None),
+                starting_agent=_convert_agent(self.model_params, starting_agent, None),
                 input=input,
                 context=context,
                 max_turns=max_turns,

tests/contrib/openai_agents/test_openai.py

@@ -96,9 +96,13 @@
     TestModelProvider,
 )
 from temporalio.contrib.openai_agents._model_parameters import ModelSummaryProvider
-from temporalio.contrib.openai_agents._temporal_model_stub import _extract_summary
+from temporalio.contrib.openai_agents._openai_runner import _convert_agent
+from temporalio.contrib.openai_agents._temporal_model_stub import (
+    _extract_summary,
+    _TemporalModelStub,
+)
 from temporalio.contrib.pydantic import pydantic_data_converter
-from temporalio.exceptions import ApplicationError, CancelledError
+from temporalio.exceptions import ApplicationError, CancelledError, TemporalError
 from temporalio.testing import WorkflowEnvironment
 from temporalio.workflow import ActivityConfig
 from tests.contrib.openai_agents.research_agents.research_manager import (
@@ -897,7 +901,10 @@ async def update_seat(
 async def on_seat_booking_handoff(
     context: RunContextWrapper[AirlineAgentContext],
 ) -> None:
-    flight_number = f"FLT-{workflow.random().randint(100, 999)}"
+    try:
+        flight_number = f"FLT-{workflow.random().randint(100, 999)}"
+    except TemporalError:
+        flight_number = "FLT-100"
     context.context.flight_number = flight_number
 
 
@@ -975,6 +982,8 @@ class CustomerServiceModel(StaticTestModel):
         ResponseBuilders.output_message(
             "Your seat has been updated to a window seat. If there's anything else you need, feel free to let me know!"
         ),
+        ResponseBuilders.tool_call("{}", "transfer_to_triage_agent"),
+        ResponseBuilders.output_message("You're welcome!"),
     ]
 
 
@@ -989,8 +998,7 @@ def __init__(self, input_items: list[TResponseInputItem] = []):
     @workflow.run
     async def run(self, input_items: list[TResponseInputItem] = []):
         await workflow.wait_condition(
-            lambda: workflow.info().is_continue_as_new_suggested()
-            and workflow.all_handlers_finished()
+            lambda: False
         )
         workflow.continue_as_new(self.input_items)
 
@@ -1062,7 +1070,13 @@ async def test_customer_service_workflow(client: Client, use_local_model: bool):
     ]
     client = Client(**new_config)
 
-    questions = ["Hello", "Book me a flight to PDX", "11111", "Any window seat"]
+    questions = [
+        "Hello",
+        "Book me a flight to PDX",
+        "11111",
+        "Any window seat",
+        "Take me back to the triage agent to say goodbye",
+    ]
 
     async with new_worker(
         client,
@@ -1101,7 +1115,7 @@ async def test_customer_service_workflow(client: Client, use_local_model: bool):
                 if e.HasField("activity_task_completed_event_attributes"):
                     events.append(e)
 
-            assert len(events) == 6
+            assert len(events) == 8
             assert (
                 "Hi there! How can I assist you today?"
                 in events[0]
@@ -1138,6 +1152,18 @@ async def test_customer_service_workflow(client: Client, use_local_model: bool):
                 .activity_task_completed_event_attributes.result.payloads[0]
                 .data.decode()
             )
+            assert (
+                "transfer_to_triage_agent"
+                in events[6]
+                .activity_task_completed_event_attributes.result.payloads[0]
+                .data.decode()
+            )
+            assert (
+                "You're welcome!"
+                in events[7]
+                .activity_task_completed_event_attributes.result.payloads[0]
+                .data.decode()
+            )
 
 
 class InputGuardrailModel(OpenAIResponsesModel):
@@ -2571,3 +2597,17 @@ def override_get_activities() -> Sequence[Callable]:
             err.value.cause.message
             == "MCP Stateful Server Worker failed to schedule activity."
         )
+
+
+async def test_model_conversion_loops():
+    agent = init_agents()
+    converted = _convert_agent(ModelActivityParameters(), agent, None)
+    seat_booking_handoff = converted.handoffs[1]
+    assert isinstance(seat_booking_handoff, Handoff)
+    context: RunContextWrapper[AirlineAgentContext] = RunContextWrapper(
+        context=AirlineAgentContext()  # type: ignore
+    )
+    seat_booking_agent = await seat_booking_handoff.on_invoke_handoff(context, "")
+    triage_agent = seat_booking_agent.handoffs[0]
+    assert isinstance(triage_agent, Agent)
+    assert isinstance(triage_agent.model, _TemporalModelStub)