fix(webui): correct activity duration display

webui/src/components/thread/AgentActivityCluster.tsx

@@ -245,9 +245,22 @@ export function AgentActivityCluster({
   const singleFileTooltipPath = fileCount === 1 ? primaryFileTooltipPath : undefined;
   const hasVisibleActivity = reasoningSteps > 0 || toolCalls > 0 || cliCount > 0 || mcpCount > 0 || fileCount > 0;
   const hasOnlyFileActivity = fileCount > 0 && messages.every(messageHasOnlyFileActivity);
+  const hasNonReasoningActivity = toolCalls > 0 || cliCount > 0 || mcpCount > 0 || fileCount > 0;
   const durationMs = activityDurationMs(messages, isTurnStreaming, now, turnLatencyMs);
   const activityDuration = formatActivityDuration(durationMs);
-  const thoughtLabel = isTurnStreaming
+  const thoughtLabel = hasNonReasoningActivity
+    ? isTurnStreaming
+      ? t("message.activityWorkingFor", {
+          duration: activityDuration,
+          defaultValue: "Working for {{duration}}",
+        })
+      : durationMs <= 0
+        ? t("message.activityWorked", { defaultValue: "Worked" })
+      : t("message.activityWorkedFor", {
+          duration: activityDuration,
+          defaultValue: "Worked for {{duration}}",
+        })
+    : isTurnStreaming
       ? t("message.activityThinkingFor", {
           duration: activityDuration,
           defaultValue: "Thinking for {{duration}}",

webui/src/i18n/locales/en/common.json

@@ -987,6 +987,9 @@
     "activityThinkingFor": "Thinking for {{duration}}",
     "activityThought": "Thought",
     "activityThoughtFor": "Thought for {{duration}}",
+    "activityWorkingFor": "Working for {{duration}}",
+    "activityWorked": "Worked",
+    "activityWorkedFor": "Worked for {{duration}}",
     "cliActivityRunningOne": "Using @{{name}}",
     "cliActivityRanOne": "Used @{{name}}",
     "cliActivityFailedOne": "Failed @{{name}}",

webui/src/i18n/locales/es/common.json

@@ -992,6 +992,9 @@
     "activityThinkingFor": "Pensando durante {{duration}}",
     "activityThought": "Pensamiento completado",
     "activityThoughtFor": "Pensó durante {{duration}}",
+    "activityWorkingFor": "Trabajando durante {{duration}}",
+    "activityWorked": "Trabajo completado",
+    "activityWorkedFor": "Trabajó durante {{duration}}",
     "cliActivityRunningOne": "Usando @{{name}}",
     "cliActivityRanOne": "Usó @{{name}}",
     "cliActivityFailedOne": "Falló @{{name}}",

webui/src/i18n/locales/fr/common.json

@@ -992,6 +992,9 @@
     "activityThinkingFor": "Réflexion pendant {{duration}}",
     "activityThought": "Réflexion terminée",
     "activityThoughtFor": "Réflexion terminée en {{duration}}",
+    "activityWorkingFor": "Travail en cours depuis {{duration}}",
+    "activityWorked": "Travail terminé",
+    "activityWorkedFor": "Travail terminé en {{duration}}",
     "cliActivityRunningOne": "Utilisation de @{{name}}",
     "cliActivityRanOne": "@{{name}} utilisé",
     "cliActivityFailedOne": "Échec de @{{name}}",

webui/src/i18n/locales/id/common.json

@@ -992,6 +992,9 @@
     "activityThinkingFor": "Berpikir selama {{duration}}",
     "activityThought": "Selesai berpikir",
     "activityThoughtFor": "Selesai berpikir dalam {{duration}}",
+    "activityWorkingFor": "Memproses selama {{duration}}",
+    "activityWorked": "Selesai memproses",
+    "activityWorkedFor": "Diproses selama {{duration}}",
     "cliActivityRunningOne": "Menggunakan @{{name}}",
     "cliActivityRanOne": "Menggunakan @{{name}} selesai",
     "cliActivityFailedOne": "@{{name}} gagal",

webui/src/i18n/locales/ja/common.json

@@ -992,6 +992,9 @@
     "activityThinkingFor": "{{duration}}考えています",
     "activityThought": "思考しました",
     "activityThoughtFor": "{{duration}}考えました",
+    "activityWorkingFor": "{{duration}}作業中",
+    "activityWorked": "作業しました",
+    "activityWorkedFor": "{{duration}}作業しました",
     "cliActivityRunningOne": "@{{name}} を使用中",
     "cliActivityRanOne": "@{{name}} を使用しました",
     "cliActivityFailedOne": "@{{name}} が失敗しました",

webui/src/i18n/locales/ko/common.json

@@ -992,6 +992,9 @@
     "activityThinkingFor": "{{duration}} 동안 생각 중",
     "activityThought": "생각함",
     "activityThoughtFor": "{{duration}} 동안 생각함",
+    "activityWorkingFor": "{{duration}} 동안 작업 중",
+    "activityWorked": "작업함",
+    "activityWorkedFor": "{{duration}} 동안 작업함",
     "cliActivityRunningOne": "@{{name}} 사용 중",
     "cliActivityRanOne": "@{{name}} 사용함",
     "cliActivityFailedOne": "@{{name}} 실패",

webui/src/i18n/locales/vi/common.json

@@ -992,6 +992,9 @@
     "activityThinkingFor": "Đang suy nghĩ trong {{duration}}",
     "activityThought": "Đã suy nghĩ",
     "activityThoughtFor": "Đã suy nghĩ trong {{duration}}",
+    "activityWorkingFor": "Đang xử lý trong {{duration}}",
+    "activityWorked": "Đã xử lý",
+    "activityWorkedFor": "Đã xử lý trong {{duration}}",
     "cliActivityRunningOne": "Đang dùng @{{name}}",
     "cliActivityRanOne": "Đã dùng @{{name}}",
     "cliActivityFailedOne": "@{{name}} thất bại",

webui/src/i18n/locales/zh-CN/common.json

@@ -987,6 +987,9 @@
     "activityThinkingFor": "思考中 {{duration}}",
     "activityThought": "已思考",
     "activityThoughtFor": "思考了 {{duration}}",
+    "activityWorkingFor": "处理中 {{duration}}",
+    "activityWorked": "已处理",
+    "activityWorkedFor": "处理了 {{duration}}",
     "cliActivityRunningOne": "正在使用 @{{name}}",
     "cliActivityRanOne": "已使用 @{{name}}",
     "cliActivityFailedOne": "使用 @{{name}} 失败",

webui/src/i18n/locales/zh-TW/common.json

@@ -992,6 +992,9 @@
     "activityThinkingFor": "思考中，已 {{duration}}",
     "activityThought": "已思考",
     "activityThoughtFor": "已思考 {{duration}}",
+    "activityWorkingFor": "處理中，已 {{duration}}",
+    "activityWorked": "已處理",
+    "activityWorkedFor": "已處理 {{duration}}",
     "cliActivityRunningOne": "正在使用 @{{name}}",
     "cliActivityRanOne": "已使用 @{{name}}",
     "cliActivityFailedOne": "@{{name}} 失敗",

webui/src/lib/activity-timeline.ts

@@ -308,14 +308,14 @@ function activityItemsForMessage(message: UIMessage): ActivityItem[] {
 }
 
 function activityTurnLatencyMs(activityMessages: UIMessage[], visibleMessages: UIMessage[]): number | undefined {
-  for (let i = activityMessages.length - 1; i >= 0; i -= 1) {
-    const latency = activityMessages[i].latencyMs;
-    if (isValidLatency(latency)) return latency;
-  }
   for (let i = visibleMessages.length - 1; i >= 0; i -= 1) {
     const latency = visibleMessages[i].latencyMs;
     if (isValidLatency(latency)) return latency;
   }
+  for (let i = activityMessages.length - 1; i >= 0; i -= 1) {
+    const latency = activityMessages[i].latencyMs;
+    if (isValidLatency(latency)) return latency;
+  }
   return undefined;
 }
 

webui/src/tests/agent-activity-cluster.test.tsx

@@ -359,6 +359,20 @@ describe("AgentActivityCluster", () => {
     expect(screen.getByText("Thought for 12s")).toBeInTheDocument();
   });
 
+  it("labels mixed tool activity as work instead of thought", () => {
+    render(
+      <AgentActivityCluster
+        messages={activityMessages()}
+        isTurnStreaming={false}
+        hasBodyBelow
+        turnLatencyMs={12_400}
+      />,
+    );
+
+    expect(screen.getByText("Worked for 12s")).toBeInTheDocument();
+    expect(screen.queryByText("Thought for 12s")).not.toBeInTheDocument();
+  });
+
   it("omits the duration when completed history has no reliable timing", () => {
     render(
       <AgentActivityCluster

webui/src/tests/thread-messages.test.tsx

@@ -308,10 +308,47 @@ describe("ThreadMessages", () => {
 
     render(<ThreadMessages messages={messages} isStreaming={false} />);
     expect(screen.queryByRole("button", { name: /^thinking$/i })).not.toBeInTheDocument();
-    expect(screen.getByText("Thought for 9s")).toBeInTheDocument();
+    expect(screen.getByText("Worked for 9s")).toBeInTheDocument();
     expect(screen.getByText("final answer")).toBeInTheDocument();
   });
 
+  it("uses final turn latency when an earlier reasoning segment has its own latency", () => {
+    const messages: UIMessage[] = [
+      {
+        id: "r1",
+        role: "assistant",
+        content: "",
+        reasoning: "plan",
+        reasoningStreaming: false,
+        latencyMs: 3_000,
+        createdAt: 1,
+      },
+      {
+        id: "t1",
+        role: "tool",
+        kind: "trace",
+        content: "shell()",
+        traces: ["shell()"],
+        createdAt: 2,
+      },
+      {
+        id: "a1",
+        role: "assistant",
+        content: "done",
+        latencyMs: 20_000,
+        createdAt: 3,
+      },
+    ];
+
+    const units = buildDisplayUnits(messages);
+
+    expect(units[0].type === "activity" ? units[0].turnLatencyMs : undefined).toBe(20_000);
+
+    render(<ThreadMessages messages={messages} isStreaming={false} />);
+    expect(screen.getByText("Worked for 20s")).toBeInTheDocument();
+    expect(screen.queryByText("Worked for 3s")).not.toBeInTheDocument();
+  });
+
   it("keeps late activity after the live assistant answer while streaming", () => {
     const messages: UIMessage[] = [
       {
@@ -626,8 +663,8 @@ describe("ThreadMessages", () => {
 
     render(<ThreadMessages messages={messages} isStreaming={false} />);
 
-    expect(screen.getByText("Thought for 15s")).toBeInTheDocument();
+    expect(screen.getByText("Worked for 15s")).toBeInTheDocument();
-    expect(screen.queryByText("Thought for 0s")).not.toBeInTheDocument();
+    expect(screen.queryByText("Worked for 0s")).not.toBeInTheDocument();
   });
 
   it("shows copy only on the last assistant slice before the next user turn", () => {