diff --git a/web/hwlab-cloud-web/src/stores/workbench.ts b/web/hwlab-cloud-web/src/stores/workbench.ts
index e29f7034..62e8bcf3 100644
--- a/web/hwlab-cloud-web/src/stores/workbench.ts
+++ b/web/hwlab-cloud-web/src/stores/workbench.ts
@@ -1418,18 +1418,36 @@ function nonBlockingProjection(projection: ProjectionDiagnostic | null): Project
     const turnId = firstNonEmptyString(lifecycle.turnId, canonicalTraceId);
     const userMessageId = firstNonEmptyString(lifecycle.userMessageId);
     const assistantMessageId = firstNonEmptyString(lifecycle.assistantMessageId);
+    const admissionTiming = optimisticAdmissionTimingPatch(lifecycle);
     if (!turnId && !userMessageId && !assistantMessageId && canonicalTraceId === traceId) return canonicalTraceId;
     updateActiveMessages((source) => source.map((message) => {
       if (message.traceId !== traceId) return message;
       const runnerTrace = message.runnerTrace ? { ...message.runnerTrace, traceId: canonicalTraceId } : message.runnerTrace;
       const base = { ...message, traceId: canonicalTraceId, runnerTrace, updatedAt: new Date().toISOString() };
       if (message.role === "user" && userMessageId) return { ...base, id: userMessageId, messageId: userMessageId, turnId };
-      if (message.role === "agent" && assistantMessageId) return { ...base, id: assistantMessageId, messageId: assistantMessageId, turnId };
+      if (message.role === "agent" && assistantMessageId) return { ...base, ...admissionTiming, id: assistantMessageId, messageId: assistantMessageId, turnId };
       return turnId ? { ...base, turnId } : base;
     }));
     return canonicalTraceId;
   }
 
+  function optimisticAdmissionTimingPatch(lifecycle: AgentChatResponse): Partial<ChatMessage> {
+    const patch = messageTimingPatch(lifecycle);
+    if (patch.timing?.startedAt && patch.timing?.lastEventAt) return patch;
+    const record = lifecycle as Record<string, unknown>;
+    const admittedAt = firstNonEmptyString(record.startedAt, record.createdAt, record.updatedAt);
+    if (!admittedAt) return patch;
+    const timing = {
+      ...(patch.timing ?? {}),
+      startedAt: patch.timing?.startedAt ?? admittedAt,
+      lastEventAt: patch.timing?.lastEventAt ?? admittedAt,
+      finishedAt: null,
+      durationMs: null,
+      valuesRedacted: true,
+    } as WorkbenchTurnTimingProjection;
+    return { ...patch, timing, startedAt: timing.startedAt ?? null, lastEventAt: timing.lastEventAt ?? null, finishedAt: null, durationMs: null };
+  }
+
   async function clearActiveTrace(traceId: string, reason: string): Promise<void> {
     if (currentRequest.value?.traceId === traceId) currentRequest.value = null;
   }