From 06ee32a8b991d23da38ebed2bcceaed037b522d2 Mon Sep 17 00:00:00 2001
From: Jinwoo Hong <73622457+Jinwoo-H@users.noreply.github.com>
Date: Mon, 9 Nov 2026 22:07:33 -0500
Subject: [PATCH] perf(daemon): stop scanning launched agents' output for
 command-finished (#40599)

---
 .../daemon/sessions/session-launch-note.ts    | 25 +++----------------
 src/main/daemon/sessions/session.ts           |  1 -
 2 files changed, 4 insertions(+), 22 deletions(-)

diff --git a/src/main/daemon/sessions/session-launch-note.ts b/src/main/daemon/sessions/session-launch-note.ts
index c8be96ad8df..9ed81b8cb47 100644
--- a/src/main/daemon/sessions/session-launch-note.ts
+++ b/src/main/daemon/sessions/session-launch-note.ts
@@ -1,37 +1,20 @@
-import {
-  createOsc133CommandFinishedScanner,
-  type Osc133CommandFinishedScanner
-} from '../../../shared/terminal/output/terminal-osc133-command-finished'
 import type {
   DaemonLaunchNote,
   DaemonLaunchNoteChange
 } from '../protocol/daemon-launch-note-protocol'
 
-/** Main's live launch here; retired on command-finished too, since it can finish while main is down. */
+/** Main's live launch here, so a reattach after a main restart can re-arm it.
+ * Why no output scan: a finish while main is down is caught by reattach's foreground check. */
 export class SessionLaunchNote {
   current: DaemonLaunchNote | null = null
-  private retirement: Osc133CommandFinishedScanner | null = null
-
-  scan(data: string): void {
-    this.retirement?.scan(data)
-  }
 
   change(change: DaemonLaunchNoteChange): void {
-    const token = this.current?.launchToken
     if ('retire' in change) {
-      if (change.retire === token) {
+      if (change.retire === this.current?.launchToken) {
         this.current = null
-        this.retirement = null
       }
       return
     }
-    // Re-arming the same launch keeps the scanner, whose carry may hold a split marker.
-    const note = change.arm
-    if (note.launchToken !== token) {
-      this.current = note
-      this.retirement = createOsc133CommandFinishedScanner(() =>
-        this.change({ retire: note.launchToken })
-      )
-    }
+    this.current = change.arm
   }
 }
diff --git a/src/main/daemon/sessions/session.ts b/src/main/daemon/sessions/session.ts
index 38c89f0a845..f5d84d66099 100644
--- a/src/main/daemon/sessions/session.ts
+++ b/src/main/daemon/sessions/session.ts
@@ -76,7 +76,6 @@ export class Session extends SessionProcessInspection {
     try {
       this.subprocess.onData((data) => {
         if (!this._disposed) {
-          this.launchNote.scan(data)
           this.shellReady.ingestSubprocessData(data)
         }
       })