fix: improve sorted chat activity rendering

Show tools and reasoning live in sorted mode
Keep ambiguous text deferred until final output
Avoid duplicate reasoning outside Activity

packages/ui/src/components/chat/lib/turns/projectTurnActivity.ts

@@ -36,19 +36,6 @@ const getMessageFinish = (message: ChatMessageEntry): string | undefined => {
     return typeof finish === 'string' ? finish : undefined;
 };
 
-const isAssistantMessageCompleted = (message: ChatMessageEntry): boolean => {
-    const info = message.info as { time?: { completed?: unknown }; status?: unknown };
-    const completed = info.time?.completed;
-    const status = info.status;
-    if (typeof completed !== 'number' || completed <= 0) {
-        return false;
-    }
-    if (typeof status === 'string') {
-        return status === 'completed';
-    }
-    return true;
-};
-
 const buildTurnPartRecord = (
     turnId: string,
     messageId: string,
@@ -69,6 +56,7 @@ interface ProjectActivityInput {
     turnId: string;
     assistantMessages: ChatMessageEntry[];
     summarySourceMessageId?: string;
+    summarySourcePartId?: string;
     showTextJustificationActivity: boolean;
 }
 
@@ -84,35 +72,42 @@ export const projectTurnActivity = (input: ProjectActivityInput): ProjectActivit
     let hasTools = false;
     let hasReasoning = false;
 
+    input.assistantMessages.forEach((message) => {
+        message.parts.forEach((part) => {
+            if (part.type === 'tool') {
+                hasTools = true;
+                return;
+            }
+
+            if (part.type === 'reasoning' && getPartText(part)) {
+                hasReasoning = true;
+            }
+        });
+    });
+
     const taskMessageById = new Map<string, string>();
     const taskOrder: string[] = [];
     const partsByAfterTool = new Map<string | null, TurnActivityRecord[]>();
     let currentAfterToolPartId: string | null = null;
 
     input.assistantMessages.forEach((message) => {
-        const messageCompleted = isAssistantMessageCompleted(message);
         const finish = getMessageFinish(message);
+        const messageHasTool = message.parts.some((part) => part.type === 'tool');
 
         message.parts.forEach((part, partIndex) => {
             const isTool = part.type === 'tool';
-            if (isTool) {
-                hasTools = true;
-            }
 
             const text = part.type === 'reasoning' || part.type === 'text'
                 ? getPartText(part)
                 : undefined;
-
-            if (part.type === 'reasoning' && text) {
-                hasReasoning = true;
-            }
+            const partId = part.id ?? `${message.info.id}-part-${partIndex}-${part.type}`;
 
             const toolName = isTool
                 ? (part as { tool?: unknown }).tool
                 : undefined;
             const standaloneTool = isTool && isStandaloneTool(toolName);
             if (standaloneTool) {
-                const toolPartId = part.id ?? `${message.info.id}-part-${partIndex}-${part.type}`;
+                const toolPartId = partId;
                 if (!taskMessageById.has(toolPartId)) {
                     taskMessageById.set(toolPartId, message.info.id);
                     taskOrder.push(toolPartId);
@@ -120,6 +115,12 @@ export const projectTurnActivity = (input: ProjectActivityInput): ProjectActivit
                 currentAfterToolPartId = toolPartId;
             }
 
+            const isConfirmedSummaryText = part.type === 'text'
+                && typeof text === 'string'
+                && finish === 'stop'
+                && input.summarySourceMessageId === message.info.id
+                && input.summarySourcePartId === partId;
+
             let kind: TurnActivityRecord['kind'] | null = null;
             if (isTool) {
                 kind = 'tool';
@@ -130,10 +131,9 @@ export const projectTurnActivity = (input: ProjectActivityInput): ProjectActivit
             } else if (
                 input.showTextJustificationActivity
                 && part.type === 'text'
-                && messageCompleted
-                && typeof finish === 'string'
-                && finish !== 'stop'
                 && text
+                && !isConfirmedSummaryText
+                && (messageHasTool || (typeof finish === 'string' && finish !== 'stop'))
             ) {
                 kind = 'justification';
             }

packages/ui/src/components/chat/lib/turns/projectTurnRecords.ts

@@ -168,6 +168,7 @@ export const projectTurnRecords = (
             turnId: turn.turnId,
             assistantMessages: turn.assistantMessages,
             summarySourceMessageId: turn.summary.sourceMessageId,
+            summarySourcePartId: turn.summary.sourcePartId,
             showTextJustificationActivity: effectiveOptions.showTextJustificationActivity,
         });
         turn.activityParts = activity.activityParts;

packages/ui/src/components/chat/message/MessageBody.tsx

@@ -1106,6 +1106,8 @@ const AssistantMessageBody: React.FC<Omit<MessageBodyProps, 'isUser'>> = ({
         && hasAnchoredActivitySegments
         && Boolean(toggleActivityGroup);
 
+    const shouldDeferSortedInlineText = isSortedRenderMode && !hasStopFinish;
+
 
     const renderedParts = React.useMemo(() => {
         const rendered: React.ReactNode[] = [];
@@ -1152,7 +1154,7 @@ const AssistantMessageBody: React.FC<Omit<MessageBodyProps, 'isUser'>> = ({
 
             if (part.type === 'text') {
                 const activity = activityByPart.get(part);
-                if (isSortedRenderMode && !hasStopFinish) {
+                if (shouldDeferSortedInlineText) {
                     i += 1;
                     continue;
                 }
@@ -1177,10 +1179,6 @@ const AssistantMessageBody: React.FC<Omit<MessageBodyProps, 'isUser'>> = ({
 
             if (part.type === 'reasoning') {
                 const activity = activityByPart.get(part);
-                if (isSortedRenderMode && !hasStopFinish) {
-                    i += 1;
-                    continue;
-                }
                 if (activity?.kind === 'reasoning') {
                     i += 1;
                     continue;
@@ -1293,7 +1291,6 @@ const AssistantMessageBody: React.FC<Omit<MessageBodyProps, 'isUser'>> = ({
         chatRenderMode,
         collapsedPreviewCount,
         expandedTools,
-        hasStopFinish,
         isMobile,
         isActivityOwnerMessage,
         isSortedRenderMode,
@@ -1306,6 +1303,7 @@ const AssistantMessageBody: React.FC<Omit<MessageBodyProps, 'isUser'>> = ({
         shouldShowTool,
         streamPhase,
         showReasoningTraces,
+        shouldDeferSortedInlineText,
         syntaxTheme,
         toggleActivityGroup,
         turnGroupingContext,