Revert subagent group eager auto-collapse

apps/sim/app/workspace/[workspaceId]/home/components/message-content/components/agent-group/agent-group.test.ts

@@ -110,6 +110,7 @@ describe('AgentGroup browser takeover', () => {
           agentLabel: 'Browser Agent',
           items: [tool('success'), browserTakeover(reason)],
           isStreaming: true,
+          isCurrentSection: true,
           isLaneOpen: true,
         })
       )
@@ -183,6 +184,7 @@ describe('AgentGroup browser takeover', () => {
           agentLabel: 'Browser Agent',
           items: [takeover],
           isStreaming: true,
+          isCurrentSection: true,
           isLaneOpen: true,
         })
       )
@@ -204,6 +206,7 @@ describe('AgentGroup browser takeover', () => {
           agentLabel: 'Browser Agent',
           items: [completedTakeover],
           isStreaming: true,
+          isCurrentSection: true,
           isLaneOpen: true,
         })
       )

apps/sim/app/workspace/[workspaceId]/home/components/message-content/components/agent-group/agent-group.tsx

@@ -37,6 +37,8 @@ interface AgentGroupProps {
   items: AgentGroupItem[]
   isDelegating?: boolean
   isStreaming?: boolean
+  /** This group is the latest section in its parent sequence (drives collapse). */
+  isCurrentSection?: boolean
   /** The subagent lane is still open (no subagent_end yet) — i.e. actively running. */
   isLaneOpen?: boolean
 }
@@ -108,6 +110,7 @@ export function AgentGroup({
   items,
   isDelegating = false,
   isStreaming = false,
+  isCurrentSection = false,
   isLaneOpen = false,
 }: AgentGroupProps) {
   const AgentIcon = getAgentIcon(agentName)
@@ -120,18 +123,17 @@ export function AgentGroup({
   const isWorking =
     !activeBrowserTakeover && ((isDelegating && !resolved) || (isStreaming && isLaneOpen))
 
-  // Expand while the turn is live and the subagent is still working: the lane
-  // is open, or there is unresolved work. When the lane closes and the work
-  // resolves the group collapses — with parallel subagents, finished siblings
-  // fold away while the still-running ones stay open, instead of every group
-  // lingering expanded until the next section starts. Keying "still running"
-  // off the lane-open signal (not `resolved` alone) avoids a collapse/reopen
-  // flicker mid-run: a subagent's tools all momentarily read "done" in the gap
-  // between its last search and its `respond` ("Gathering thoughts") tool,
-  // transiently flipping `resolved` true; the open lane bridges that gap. The
-  // turn ending (isStreaming false) collapses everything; a manual toggle pins
-  // the choice.
-  const autoExpanded = isStreaming && (isLaneOpen || !resolved)
+  // Expand while the turn is live and any of: the lane is open (the subagent is
+  // actively running), this is the current/latest section, or there is unresolved
+  // work. A finished group stays open until the NEXT section starts (it is no
+  // longer the latest), instead of collapsing the instant its own work resolves.
+  // Keying "still running" off the lane-open signal (not `resolved` alone) avoids
+  // a collapse/reopen flicker on parallel siblings: a subagent's tools all
+  // momentarily read "done" in the gap between its last search and its `respond`
+  // ("Gathering thoughts") tool, transiently flipping `resolved` true; the open
+  // lane bridges that gap so the row never collapses mid-run. The turn ending
+  // (isStreaming false) collapses everything; a manual toggle pins the choice.
+  const autoExpanded = isStreaming && (isCurrentSection || isLaneOpen || !resolved)
   const [manualExpanded, setManualExpanded] = useState<boolean | null>(null)
   const [expandedTakeoverId, setExpandedTakeoverId] = useState<string | null>(null)
   // An outstanding permission prompt overrides a manual collapse: the turn
@@ -217,6 +219,7 @@ export function AgentGroup({
                           items={item.group.items}
                           isDelegating={item.group.isDelegating}
                           isStreaming={isStreaming}
+                          isCurrentSection={idx === items.length - 1}
                           isLaneOpen={item.group.isOpen}
                         />
                       </div>

apps/sim/app/workspace/[workspaceId]/home/components/message-content/message-content.tsx

@@ -957,6 +957,7 @@ function MessageContentInner({
                     items={segment.items}
                     isDelegating={segment.isDelegating}
                     isStreaming={isStreaming}
+                    isCurrentSection={i === segments.length - 1}
                     isLaneOpen={segment.isOpen}
                   />
                 </div>