From a5eb0c65830d195322426a363058c2c4aa0c4768 Mon Sep 17 00:00:00 2001
From: UtkarshUsername <putkarsh184@gmail.com>
Date: Fri, 30 Oct 2026 14:18:23 +0530
Subject: [PATCH 1/2] perf(client): skip idle inbox placement serialization

---
 .../src/state/threadInbox.test.ts             |  2 ++
 .../client-runtime/src/state/threadInbox.ts   | 27 ++++++++++---------
 2 files changed, 17 insertions(+), 12 deletions(-)

diff --git a/packages/client-runtime/src/state/threadInbox.test.ts b/packages/client-runtime/src/state/threadInbox.test.ts
index 35c7fa8355e39..8d898ed326cee 100644
--- a/packages/client-runtime/src/state/threadInbox.test.ts
+++ b/packages/client-runtime/src/state/threadInbox.test.ts
@@ -45,7 +45,9 @@ describe("createInboxReturnTracker", () => {
   });
   it("stamps a thread when it stops working, but never on the first observation", () => {
     const tracker = createInboxReturnTracker();
+    using stringify = vi.spyOn(JSON, "stringify");
     const first = tracker.observe([thread("a", true), thread("b", false)]);
+    expect(stringify).toHaveBeenCalledTimes(1);
     expect(first.returnedAt(thread("a", true))).toBeUndefined();
     expect(first.returnedAt(thread("b", false))).toBeUndefined();
 
diff --git a/packages/client-runtime/src/state/threadInbox.ts b/packages/client-runtime/src/state/threadInbox.ts
index de9cd822398d0..93b38fbb98042 100644
--- a/packages/client-runtime/src/state/threadInbox.ts
+++ b/packages/client-runtime/src/state/threadInbox.ts
@@ -123,7 +123,7 @@ export function createInboxReturnTracker() {
   const keyOf = (thread: ThreadKeyInput) => `${thread.environmentId}:${thread.id}`;
   const states = new Map<
     string,
-    { working: boolean; deadline: number | null; placement: string }
+    { working: boolean; deadline: number | null; placement: string | null }
   >();
   const returns = new Map<string, number>();
   const listeners = new Set<() => void>();
@@ -184,17 +184,21 @@ export function createInboxReturnTracker() {
       for (const thread of threads) {
         const key = keyOf(thread);
         present.add(key);
-        const placement = JSON.stringify([
-          thread.archivedAt,
-          thread.deletedAt,
-          thread.pinnedAt,
-          thread.settledOverride,
-          thread.settledAt,
-          thread.snoozedAt,
-          thread.snoozedUntil,
-          thread.activeOrderKey,
-        ]);
         const previous = states.get(key);
+        const actual = isThreadWorking(thread);
+        const placement =
+          actual || previous?.working
+            ? JSON.stringify([
+                thread.archivedAt,
+                thread.deletedAt,
+                thread.pinnedAt,
+                thread.settledOverride,
+                thread.settledAt,
+                thread.snoozedAt,
+                thread.snoozedUntil,
+                thread.activeOrderKey,
+              ])
+            : null;
         const actionable =
           thread.hasPendingApprovals ||
           thread.hasPendingUserInput ||
@@ -210,7 +214,6 @@ export function createInboxReturnTracker() {
           thread.pinnedAt != null ||
           thread.settledOverride === "settled" ||
           effectiveSnoozed(thread, { now: observedAt });
-        const actual = isThreadWorking(thread);
         // Only shelf placement is held: execution state and attention requests stay authoritative.
         const deadline =
           !actual && previous?.working && !actionable && !moved && !excluded

From 4dc8cef4af59af9732dd433b7becca5c1425621a Mon Sep 17 00:00:00 2001
From: maria-rcks <maria@kuuro.net>
Date: Mon, 2 Nov 2026 02:19:13 +0000
Subject: [PATCH 2/2] test(client): keep inbox return assertions behavioral

---
 packages/client-runtime/src/state/threadInbox.test.ts | 2 --
 1 file changed, 2 deletions(-)

diff --git a/packages/client-runtime/src/state/threadInbox.test.ts b/packages/client-runtime/src/state/threadInbox.test.ts
index 8d898ed326cee..35c7fa8355e39 100644
--- a/packages/client-runtime/src/state/threadInbox.test.ts
+++ b/packages/client-runtime/src/state/threadInbox.test.ts
@@ -45,9 +45,7 @@ describe("createInboxReturnTracker", () => {
   });
   it("stamps a thread when it stops working, but never on the first observation", () => {
     const tracker = createInboxReturnTracker();
-    using stringify = vi.spyOn(JSON, "stringify");
     const first = tracker.observe([thread("a", true), thread("b", false)]);
-    expect(stringify).toHaveBeenCalledTimes(1);
     expect(first.returnedAt(thread("a", true))).toBeUndefined();
     expect(first.returnedAt(thread("b", false))).toBeUndefined();