diff --git a/src/main/native-chat/agent-session-wire/structured-agent-session-final-tail-reservation.test.ts b/src/main/native-chat/agent-session-wire/structured-agent-session-final-tail-reservation.test.ts
index 1c33de1ce12..6def47daea3 100644
--- a/src/main/native-chat/agent-session-wire/structured-agent-session-final-tail-reservation.test.ts
+++ b/src/main/native-chat/agent-session-wire/structured-agent-session-final-tail-reservation.test.ts
@@ -2,24 +2,16 @@ import { describe, expect, it } from 'vitest'
 import { StructuredAgentSessionFinalTailReservation } from './structured-agent-session-final-tail-reservation'
 
 describe('finalized provider tail reservations', () => {
-  it('bounds outstanding bytes and releases each admission once', () => {
+  it('admits a large captured tail while bounding operations and releasing each admission once', () => {
     const reservation = new StructuredAgentSessionFinalTailReservation()
     const release = reservation.reserve(16 * 1024 * 1024)
     expect(release).not.toBeNull()
-    expect(reservation.reserve(1)).toBeNull()
+    const rest = Array.from({ length: 511 }, () => reservation.reserve(1))
+    expect(rest.every(Boolean)).toBe(true)
+    expect(reservation.reserve(0)).toBeNull()
     release?.()
     release?.()
     expect(reservation.reserve(16 * 1024 * 1024)).not.toBeNull()
-    expect(reservation.reserve(1)).toBeNull()
-  })
-
-  it('bounds operations even when they write no bytes', () => {
-    const reservation = new StructuredAgentSessionFinalTailReservation()
-    const releases = Array.from({ length: 512 }, () => reservation.reserve(0))
-    expect(releases.every(Boolean)).toBe(true)
-    expect(reservation.reserve(0)).toBeNull()
-    releases[0]?.()
-    expect(reservation.reserve(0)).not.toBeNull()
     expect(reservation.reserve(0)).toBeNull()
   })