diff --git a/mac/Sources/Byre/Chat.swift b/mac/Sources/Byre/Chat.swift
index 45962bc..f8df547 100644
--- a/mac/Sources/Byre/Chat.swift
+++ b/mac/Sources/Byre/Chat.swift
@@ -945,7 +945,7 @@ struct RowView: View {
             } content: {
                 VStack(alignment: .leading, spacing: 6) {
                     PreBox(text: input)
-                    ToolResult(result: row.result, unfinished: row.unfinished)
+                    ToolResult(result: row.result, unfinished: row.unfinished, started: row.started)
                 }
                 .padding(.vertical, 6)
             }
@@ -961,7 +961,7 @@ struct RowView: View {
                     ForEach(row.body!.rows) { child in
                         RowView(row: child, model: model, nested: true)
                     }
-                    ToolResult(result: row.result, unfinished: row.unfinished)
+                    ToolResult(result: row.result, unfinished: row.unfinished, started: row.started)
                 }
             }
 
@@ -1026,17 +1026,34 @@ struct RowView: View {
 private struct ToolResult: View {
     let result: String?
     let unfinished: Bool
+    let started: Date?
 
     var body: some View {
         if let result {
             PreBox(text: result)
+        } else if unfinished || started == nil {
+            label(unfinished ? "no result" : "running…")
         } else {
-            Text(unfinished ? "no result" : "running…")
-                .font(Fonts.font(12, italic: true))
-                .foregroundStyle(Palette.muted)
-                .padding(.vertical, 4)
+            TimelineView(.periodic(from: .now, by: 1)) { ctx in
+                label("running… \(elapsed(ctx.date.timeIntervalSince(started!)))")
+            }
         }
     }
+
+    private func label(_ text: String) -> some View {
+        Text(text)
+            .font(Fonts.font(12, italic: true))
+            .foregroundStyle(Palette.muted)
+            .padding(.vertical, 4)
+    }
+
+    private func elapsed(_ t: TimeInterval) -> String {
+        let s = max(0, Int(t))
+        if s < 60 {
+            return "\(s)s"
+        }
+        return "\(s / 60)m \(s % 60 < 10 ? "0" : "")\(s % 60)s"
+    }
 }
 
 private struct RunSummary: View {
diff --git a/mac/Sources/Byre/TranscriptBuilder.swift b/mac/Sources/Byre/TranscriptBuilder.swift
index 809e216..b26b6c9 100644
--- a/mac/Sources/Byre/TranscriptBuilder.swift
+++ b/mac/Sources/Byre/TranscriptBuilder.swift
@@ -73,6 +73,7 @@ final class Row: Identifiable {
     var tag = false
     var result: String?
     var unfinished = false
+    var started: Date?
     var status = "starting…"
     var statusState = SubagentState.running
     var active = false
@@ -457,6 +458,7 @@ final class TranscriptBuilder {
             let sub = ctx.subagents[parent]
             if ev.kind == "agent.tool_call" && isSubagentCall(p) {
                 let row = renderSubagent(p)
+                row.started = ev.createdAt
                 if let sub {
                     sub.run = nil
                     sub.row.body!.rows.append(row)
@@ -468,7 +470,9 @@ final class TranscriptBuilder {
             }
             if ev.kind == "agent.tool_call" {
                 let name = toolLabel(jsString(p["name"]))
-                addToRun(renderToolCall(p), Call(name: name, target: toolTarget(p["input"] ?? nil, worktree())), parent)
+                let row = renderToolCall(p)
+                row.started = ev.createdAt
+                addToRun(row, Call(name: name, target: toolTarget(p["input"] ?? nil, worktree())), parent)
                 continue
             }
             guard let row = renderEvent(ev) else {