diff --git a/apps/web/src/pages/workspace/index.tsx b/apps/web/src/pages/workspace/index.tsx
index 87f9c593..be363108 100644
--- a/apps/web/src/pages/workspace/index.tsx
+++ b/apps/web/src/pages/workspace/index.tsx
@@ -742,16 +742,14 @@ function ReadyRoom({
     lastShown?.role === "assistant" && !streaming && !sending
       ? suggestedReplies(lastShown.text)
       : [];
-  // Mid-turn by native state, whoever sent the message: this stream saw the message run start and
-  // not end, or the hub's activity read saw one start after the last end this stream saw.
   const agents = activity.data?.agents;
-  const coordinatorTurnSince = agents?.find(
-    (agent) => agent.role === "coordinator",
-  )?.since;
+  const coordinator = agents?.find((agent) => agent.role === "coordinator");
+  // Mid-turn by the hub's read: the coordinator's run began after the last end this stream saw.
+  // The stream's own flag is not used; a frame missed while the tab is hidden leaves it set.
   const working =
-    liveRun.running ||
-    (coordinatorTurnSince !== undefined &&
-      Date.parse(coordinatorTurnSince) > (liveRun.endedAt ?? 0));
+    coordinator !== undefined &&
+    (liveRun.endedAt === null ||
+      Date.parse(coordinator.since) > liveRun.endedAt);
   // The engine treats the first id as history and every later change as a
   // send: it pins that turn and reserves space under it. A turn loaded from
   // the mirror is not a send. Passing it pins the old message and the reserve
@@ -1244,11 +1242,8 @@ function ReadyRoom({
   for (const dispatch of dispatches) noteDispatch(dispatchRoom, dispatch);
   // The document a writer or reviewer run works on, from the coordinator's own hand-off call as
   // the hub's activity read saw it start: the latest such call made before the run started.
-  const coordinatorTools = agents?.find(
-    (agent) => agent.role === "coordinator",
-  )?.tools;
-  if (coordinatorTools !== undefined)
-    for (const tool of coordinatorTools) {
+  if (coordinator !== undefined)
+    for (const tool of coordinator.tools) {
       const role = HANDOFF_ROLE[tool.name];
       if (role !== undefined && tool.subject !== undefined)
         handoffCalls.current.set(`${tool.at}:${tool.name}`, {