diff --git a/docs/macos.md b/docs/macos.md
index 8b74725..626bb35 100644
--- a/docs/macos.md
+++ b/docs/macos.md
@@ -97,7 +97,7 @@ Closing the window leaves the app running with its store and streams (`applicati
 
 Each view does what its TypeScript counterpart does, with the same text, refresh triggers and empty states.
 
-- **Transcript and Lead.** `TranscriptBuilder` ports `appendEvents` and `renderEvent` from `task.ts` as a pure function from events to a list of rows: user and agent messages, consecutive tool calls folded into one group with its summary ("Read file ×3"), subagents nested with their status, thinking, the byre prompt collapsed, held turns, `NO_REPLY` turns folded away, handoffs, snapshot rows with changes, fork and review, and notes for each event kind the web client draws. It is incremental: a new batch extends the existing rows. The view is a `ScrollView` with a `LazyVStack`, stuck to the bottom unless the user has scrolled more than 80 points up, with pending sends shown at the end until the server echoes them. A turn summary counts as read when its row is on screen and the app is active (`markSummaryRead`). The head carries Compact (with its context-usage fill), Sync from main, Merge and Discard, with the same enabling rules and tooltips.
+- **Transcript and Lead.** `TranscriptBuilder` ports `appendEvents` and `renderEvent` from `task.ts` as a pure function from events to a list of rows: user and agent messages, consecutive tool calls folded into one group with its summary ("Read file ×3"), subagents nested with their status, pending tool calls and running subagents (background ones included after the turn ends) outlined in the accent colour with a 0.6s fade, thinking, the byre prompt collapsed, held turns, `NO_REPLY` turns folded away, handoffs, snapshot rows with changes, fork and review, and notes for each event kind the web client draws. It is incremental: a new batch extends the existing rows. The view is a `ScrollView` with a `LazyVStack`, stuck to the bottom unless the user has scrolled more than 80 points up, with pending sends shown at the end until the server echoes them. A turn summary counts as read when its row is on screen and the app is active (`markSummaryRead`). The head carries Compact (with its context-usage fill), Sync from main, Merge and Discard, with the same enabling rules and tooltips.
 - **Composer.** A `TextEditor`, with paste and drop handled as in "Gaps in SwiftUI". Text, the model menu (filtered by vendor as in `modelSelect`), Interrupt and Send. Enter sends, Shift-Enter adds a newline, and Enter during IME composition does neither. Pasted or dropped PNG, JPEG, GIF and WebP images up to the web client's limit become thumbnails with ×, uploaded to `POST /api/blobs` on send. A failed send puts the text and images back and shows the error.
 - **Inbox.** The selected task's oldest open item, rendered from its Markdown context with each choice's marker replaced by a clickable block (pick-one, sends at once) or checkbox (pick-any, with Submit), the "recommended" tag, image-choice grids, attachments, Let the agent decide, Other… and, for errors, Reply… and Dismiss. Arrow keys move between choices. A 409 shows its error as in the browser. The Changes summary line sits above it.
 - **Changes, Files, Reviews, Workflow, Project, Status, Settings.** Ports of their files, including the pinned-snapshot stepper, open-diff memory, per-task place in Files, finding diffs with Fix and Ignore, nested subtasks, TODO Start and Discuss, rate-limit pace bars and lead notes. The Workflow tab draws its stage graph natively from the `WorkflowRun` (stages as boxes coloured by state, `after` as edges, laid out top to bottom by depth) with the layout and drawing code from "Diagrams", fed from the run's data rather than Mermaid text.
diff --git a/mac/Sources/Byre/Chat.swift b/mac/Sources/Byre/Chat.swift
index 1342fba..bc0ae0c 100644
--- a/mac/Sources/Byre/Chat.swift
+++ b/mac/Sources/Byre/Chat.swift
@@ -92,6 +92,14 @@ final class ChatModel {
         builder.open && session?.state == .running
     }
 
+    var subagents: Bool {
+        (session?.subagents ?? 0) > 0
+    }
+
+    func working(_ row: Row) -> Bool {
+        row.pending && (running || subagents && row.inActive) || row.active && (running || subagents)
+    }
+
     var hasOlder: Bool {
         kind == .lead && store.leadHasOlder()
     }
@@ -609,6 +617,7 @@ struct DetailsBox<Summary: View, Content: View>: View {
     @ViewBuilder let content: Content
     @Environment(\.paneAccent) private var accent
     @ViewState private var open = false
+    @ViewState private var shown = false
 
     var body: some View {
         VStack(alignment: .leading, spacing: 0) {
@@ -637,9 +646,13 @@ struct DetailsBox<Summary: View, Content: View>: View {
         .background(boxed ? (nested ? Palette.raised : Palette.surface) : .clear, in: RoundedRectangle(cornerRadius: 8))
         .overlay {
             if boxed {
-                RoundedRectangle(cornerRadius: 8).stroke(working ? accent : Palette.border)
+                RoundedRectangle(cornerRadius: 8).stroke(working && shown ? accent : Palette.border)
+                    .animation(.easeInOut(duration: 0.6), value: working && shown)
             }
         }
+        .onAppear {
+            shown = true
+        }
     }
 }
 
@@ -747,7 +760,7 @@ struct RowView: View {
             }
 
         case .tool(let name, let brief, let input):
-            DetailsBox(nested: nested, working: model.running && row.pending) {
+            DetailsBox(nested: nested, working: model.working(row)) {
                 SubagentTag(show: row.tag)
                 Text(styled([(name, 600, nil), (" ", 400, nil), (brief, 400, Palette.muted)]))
             } content: {
@@ -759,7 +772,7 @@ struct RowView: View {
             }
 
         case .subagent(let title, let description, let prompt):
-            DetailsBox(nested: nested, working: model.running && row.pending) {
+            DetailsBox(nested: nested, working: model.working(row)) {
                 SubagentTag(show: row.tag)
                 Text(styled([(title, 600, nil), (" ", 400, nil), (description, 400, Palette.muted)]))
                 Spacer(minLength: 12)
@@ -778,7 +791,7 @@ struct RowView: View {
             }
 
         case .group:
-            DetailsBox(nested: nested, working: model.running && row.pending) {
+            DetailsBox(nested: nested, working: model.working(row)) {
                 SubagentTag(show: row.tag)
                 RunSummary(calls: row.calls)
             } content: {
diff --git a/mac/Sources/Byre/Store.swift b/mac/Sources/Byre/Store.swift
index 02232fa..36fa5bc 100644
--- a/mac/Sources/Byre/Store.swift
+++ b/mac/Sources/Byre/Store.swift
@@ -18,7 +18,7 @@ struct TaskState {
 }
 
 private let workingTitles: [ByreTask.StatePayload: String] = [
-    .running: "The agent is mid-turn",
+    .running: "The agent is mid-turn or its subagents are running",
     .reviewPending: "A review of the turn's work is about to start",
     .reviewing: "A review is running",
     .discarding: "Discarding",
@@ -488,7 +488,7 @@ final class Store {
                     try await self.loadTasks(projectId)
                 }
             }
-        case "session.created", "session.state", "session.model":
+        case "session.created", "session.state", "session.subagents", "session.model":
             if ev.owner != nil {
                 spawn("load lead sessions") {
                     try await self.loadLeadSessions()
diff --git a/mac/Sources/Byre/TranscriptBuilder.swift b/mac/Sources/Byre/TranscriptBuilder.swift
index c460ede..e8d9454 100644
--- a/mac/Sources/Byre/TranscriptBuilder.swift
+++ b/mac/Sources/Byre/TranscriptBuilder.swift
@@ -75,6 +75,8 @@ final class Row: Identifiable {
     var unfinished = false
     var status = "starting…"
     var statusState = SubagentState.running
+    var active = false
+    weak var owner: Row?
     var calls: [Call] = []
     var summary: Note?
     var review: Review?
@@ -94,6 +96,28 @@ final class Row: Identifiable {
         }
     }
 
+    var inActive: Bool {
+        var o = owner
+        while let r = o {
+            if r.active {
+                return true
+            }
+            o = r.owner
+        }
+        return false
+    }
+
+    func within(_ ancestor: Row) -> Bool {
+        var o = owner
+        while let r = o {
+            if r === ancestor {
+                return true
+            }
+            o = r.owner
+        }
+        return false
+    }
+
     init(_ kind: RowKind, taskId: String?, body: Bool = false) {
         rowIds += 1
         id = rowIds
@@ -275,6 +299,7 @@ final class TranscriptBuilder {
         }
         if run.group == nil {
             let group = Row(.group, taskId: taskId, body: true)
+            group.owner = ctx.subagents[parent]?.row
             for list in [run.container, sink ?? root] {
                 if let i = list.rows.firstIndex(where: { $0 === run.first }) {
                     list.rows[i] = group
@@ -368,6 +393,14 @@ final class TranscriptBuilder {
                 claudeTaskStatus(p)
                 continue
             }
+            if ev.kind == "session.subagents" {
+                if int(p, "subagents") == 0 {
+                    for sub in ctx.subagents.values where sub.row.active {
+                        endSubagent(sub.row, .error, "ended with its process")
+                    }
+                }
+                continue
+            }
             if sink == nil && ((ev.kind == "agent.message" && parent.isEmpty) || ev.kind == "turn.ended" || ev.kind == "user.message") {
                 dropStream()
             }
@@ -475,20 +508,30 @@ final class TranscriptBuilder {
         }
         switch str(p, "subtype") {
         case "task_started":
+            sub.row.active = true
             sub.row.status = bool(p, "is_backgrounded") ? "running in the background" : "running"
         case "task_progress":
             sub.row.status = str(p, "description") ?? "running"
         case "task_notification":
-            sub.row.statusState = str(p, "status") == "completed" ? .done : .error
-            sub.row.status = jsString(p["status"])
+            endSubagent(sub.row, str(p, "status") == "completed" ? .done : .error, jsString(p["status"]))
         default:
             break
         }
     }
 
+    private func endSubagent(_ row: Row, _ state: SubagentState, _ status: String) {
+        row.active = false
+        row.statusState = state
+        row.status = status
+        for tool in ctx.tools.values where tool.result == nil && tool.within(row) {
+            tool.unfinished = true
+        }
+    }
+
     private func renderToolCall(_ p: JSONDict) -> Row {
         let row = Row(.tool(name: toolLabel(jsString(p["name"])), brief: toolBrief(p["input"] ?? nil, worktree()), input: prettyJSON(p["input"] ?? nil)), taskId: taskId)
         row.tag = subagentTag(parentOf(p))
+        row.owner = ctx.subagents[parentOf(p)]?.row
         ctx.tools[jsString(p["id"])] = row
         return row
     }
@@ -499,6 +542,7 @@ final class TranscriptBuilder {
         let type = str(input, "subagent_type") ?? "subagent"
         let row = Row(.subagent(title: "\(jsString(p["name"])) \(type)", description: str(input, "description") ?? "", prompt: parseMarkdown(str(input, "prompt") ?? "")), taskId: taskId, body: true)
         row.tag = subagentTag(parentOf(p))
+        row.owner = ctx.subagents[parentOf(p)]?.row
         ctx.tools[id] = row
         ctx.subagents[id] = Subagent(row: row)
         return row
@@ -553,7 +597,7 @@ final class TranscriptBuilder {
             return nil
 
         case "turn.ended":
-            for row in ctx.tools.values where row.result == nil {
+            for row in ctx.tools.values where row.result == nil && !(row.active || row.inActive) {
                 row.unfinished = true
             }
             if bool(p, "handoff") {