diff --git a/backend/src/researchx/api/app.py b/backend/src/researchx/api/app.py
index ffc4271..e5488b7 100644
--- a/backend/src/researchx/api/app.py
+++ b/backend/src/researchx/api/app.py
@@ -226,6 +226,7 @@ def create_app(
             storage=storage,
             registry=registry,
             event_bus=bus,
+            on_complete=runs.note_completed,
         )
         probe_data: dict[str, Any] | None = None
         if supports_probe(model):
@@ -240,9 +241,7 @@ def create_app(
         runs.add(run_id, actor, task, bus)
 
         async def _watch() -> None:
-            state = await task
-            if state.state == RunStateName.DONE:
-                runs.note_completed()
+            await task
 
         asyncio.create_task(_watch())
         return _summary(run_id)
diff --git a/backend/src/researchx/engine/actor.py b/backend/src/researchx/engine/actor.py
index 7b54f9e..edbed81 100644
--- a/backend/src/researchx/engine/actor.py
+++ b/backend/src/researchx/engine/actor.py
@@ -1,4 +1,5 @@
 import asyncio
+from collections.abc import Callable
 from datetime import UTC, datetime
 from typing import Any
 
@@ -34,6 +35,7 @@ class RunActor:
         storage: LocalStorageAdapter,
         registry: MethodologyRegistry,
         event_bus: EventBus,
+        on_complete: Callable[[], None] | None = None,
     ) -> None:
         self._config = run_config
         self._model = model
@@ -41,6 +43,7 @@ class RunActor:
         self._storage = storage
         self._registry = registry
         self._bus = event_bus
+        self._on_complete = on_complete
         self._store = EvidenceStore()
         self.state = RunState(
             run_id=run_config.run_id,
@@ -83,6 +86,8 @@ class RunActor:
     async def _checkpoint(self, target: RunStateName) -> None:
         if self.state.state != target:
             self.state.transition(target)
+            if target is RunStateName.DONE and self._on_complete is not None:
+                self._on_complete()
         await self._persist()
 
     async def _wait_if_paused(self) -> None: