one more fix

apps/sim/app/workspace/[workspaceId]/home/hooks/use-chat.ts

@@ -77,6 +77,7 @@ import { getNextWorkflowColor } from '@/lib/workflows/colors'
 import { getQueryClient } from '@/app/_shell/providers/get-query-client'
 import { invalidateResourceQueries } from '@/app/workspace/[workspaceId]/home/components/mothership-view/components/resource-registry'
 import {
+  buildCompletedPreviewSessions,
   type FilePreviewSessionsState,
   INITIAL_FILE_PREVIEW_SESSIONS_STATE,
   reduceFilePreviewSessions,
@@ -766,6 +767,18 @@ export function useChat(
     [completePreviewSession, syncPreviewSessionRefs]
   )
 
+  const reconcileTerminalPreviewSessions = useCallback(() => {
+    const completedAt = new Date().toISOString()
+    const completedSessions = buildCompletedPreviewSessions(
+      previewSessionsStateRef.current.sessions,
+      completedAt
+    )
+
+    for (const session of completedSessions) {
+      applyCompletedPreviewSession(session)
+    }
+  }, [applyCompletedPreviewSession])
+
   const removePreviewSessionImmediate = useCallback(
     (sessionId: string) => {
       const nextState = reduceFilePreviewSessions(previewSessionsStateRef.current, {
@@ -2305,6 +2318,7 @@ export function useChat(
 
   const finalize = useCallback(
     (options?: { error?: boolean }) => {
+      reconcileTerminalPreviewSessions()
       sendingRef.current = false
       setIsSending(false)
       setIsReconnecting(false)
@@ -2333,7 +2347,7 @@ export function useChat(
         })
       }
     },
-    [invalidateChatQueries]
+    [invalidateChatQueries, reconcileTerminalPreviewSessions]
   )
   finalizeRef.current = finalize
 

apps/sim/app/workspace/[workspaceId]/home/hooks/use-file-preview-sessions.test.tsx

@@ -4,6 +4,7 @@
 import { describe, expect, it } from 'vitest'
 import type { FilePreviewSession } from '@/lib/copilot/request/session'
 import {
+  buildCompletedPreviewSessions,
   INITIAL_FILE_PREVIEW_SESSIONS_STATE,
   reduceFilePreviewSessions,
 } from '@/app/workspace/[workspaceId]/home/hooks/use-file-preview-sessions'
@@ -30,6 +31,40 @@ function createSession(
 }
 
 describe('reduceFilePreviewSessions', () => {
+  it('builds complete sessions for terminal stream reconciliation', () => {
+    const completedAt = '2026-04-10T00:00:10.000Z'
+    const nextSessions = buildCompletedPreviewSessions(
+      {
+        'preview-1': createSession({
+          id: 'preview-1',
+          toolCallId: 'preview-1',
+          status: 'pending',
+          previewText: 'draft',
+        }),
+        'preview-2': createSession({
+          id: 'preview-2',
+          toolCallId: 'preview-2',
+          status: 'streaming',
+          previewText: 'partial',
+        }),
+        'preview-3': createSession({
+          id: 'preview-3',
+          toolCallId: 'preview-3',
+          status: 'complete',
+          previewText: 'done',
+          completedAt: '2026-04-10T00:00:03.000Z',
+        }),
+      },
+      completedAt
+    )
+
+    expect(nextSessions).toHaveLength(2)
+    expect(nextSessions.map((session) => session.id)).toEqual(['preview-1', 'preview-2'])
+    expect(nextSessions.every((session) => session.status === 'complete')).toBe(true)
+    expect(nextSessions.every((session) => session.updatedAt === completedAt)).toBe(true)
+    expect(nextSessions.every((session) => session.completedAt === completedAt)).toBe(true)
+  })
+
   it('hydrates the latest active preview session', () => {
     const state = reduceFilePreviewSessions(INITIAL_FILE_PREVIEW_SESSIONS_STATE, {
       type: 'hydrate',

apps/sim/app/workspace/[workspaceId]/home/hooks/use-file-preview-sessions.ts

@@ -48,6 +48,20 @@ export function pickActiveSessionId(
   return latestActive?.id ?? null
 }
 
+export function buildCompletedPreviewSessions(
+  sessions: Record<string, FilePreviewSession>,
+  completedAt: string
+): FilePreviewSession[] {
+  return Object.values(sessions)
+    .filter((session) => session.status !== 'complete')
+    .map((session) => ({
+      ...session,
+      status: 'complete' as const,
+      updatedAt: completedAt,
+      completedAt,
+    }))
+}
+
 export function reduceFilePreviewSessions(
   state: FilePreviewSessionsState,
   action: FilePreviewSessionsAction