diff --git a/src/main/native-chat/agent-session-wire/structured-agent-session-chat-stop.ts b/src/main/native-chat/agent-session-wire/structured-agent-session-chat-stop.ts
index b6224728b96..fd8f9cfe596 100644
--- a/src/main/native-chat/agent-session-wire/structured-agent-session-chat-stop.ts
+++ b/src/main/native-chat/agent-session-wire/structured-agent-session-chat-stop.ts
@@ -85,7 +85,12 @@ export function mutateWithChatStop<TValue>(
           clientOperationId: envelope.clientOperationId,
           ...named,
           stopChild: () => context.stopAgent(sessionId),
-          onStopChildError: (error) => context.deps.onEventSinkError?.({ sessionId, error }),
+          onStopChildError: (error) =>
+            context.deps.logger.warn('ending the agent process on Stop failed', {
+              scope: 'stop-child',
+              sessionId,
+              error
+            }),
           // The host drops its child only once the exit is proven, and nothing else runs meanwhile.
           childReleased: () => context.sessions.get(sessionId)?.child !== child,
           endSession: (owed) => {
diff --git a/src/main/native-chat/agent-session-wire/structured-agent-session-conversation-stop.test.ts b/src/main/native-chat/agent-session-wire/structured-agent-session-conversation-stop.test.ts
index a5af4b851ba..8c1ae5f3128 100644
--- a/src/main/native-chat/agent-session-wire/structured-agent-session-conversation-stop.test.ts
+++ b/src/main/native-chat/agent-session-wire/structured-agent-session-conversation-stop.test.ts
@@ -26,7 +26,7 @@ import {
   resetHostTestOperationIds
 } from './structured-agent-session-host-test-data'
 import { openTestJournalHostDatabase } from '../agent-session-journal/journal-host-database-test-support'
-import { createStructuredAgentSessionLogger } from './structured-agent-session-logger'
+import { recordingStructuredAgentSessionLogger } from './structured-agent-session-logger-test-support'
 
 const CALLER = { callerKey: 'client-1' }
 
@@ -42,7 +42,7 @@ let acknowledgeSessionRelease: Mock<
 >
 /** Codex's answer by default: its Stop keeps the child. */
 let stopEndsSession: boolean
-let onEventSinkError: Mock<(failure: { sessionId: string; error: unknown }) => void>
+let log: ReturnType<typeof recordingStructuredAgentSessionLogger>
 let events: StructuredAgentSessionEventSink | undefined
 
 function eventually(assertion: () => void | Promise<void>): Promise<void> {
@@ -59,10 +59,10 @@ beforeEach(async () => {
   closeSession = vi.fn(async () => true)
   acknowledgeSessionRelease = vi.fn()
   stopEndsSession = false
-  onEventSinkError = vi.fn()
+  log = recordingStructuredAgentSessionLogger()
   store = await openTestAgentSessionRecordStore(root)
   host = new StructuredAgentSessionHost({
-    logger: createStructuredAgentSessionLogger(),
+    logger: log.logger,
     store,
     adapter: {
       acquire: async ({ fence, spawnToken, events: sink }) => {
@@ -97,7 +97,6 @@ beforeEach(async () => {
     journalDatabase: openTestJournalHostDatabase(root),
     claimKeyId: 'key-1',
     mintSpawnToken: () => 'spawn-1',
-    onEventSinkError,
     now: () => NOW
   })
   expect(await host.attach(CALLER, hostTestAttachParams(null))).toMatchObject({ ok: true })
@@ -288,7 +287,11 @@ describe('a Stop that names no turn', () => {
     expect(await stop()).toMatchObject({ ok: true, value: { cancelled: false } })
 
     expect(closeSession).toHaveBeenCalledExactlyOnceWith(SESSION, 'user-stop')
-    expect(onEventSinkError).toHaveBeenCalledWith(expect.objectContaining({ sessionId: SESSION }))
+    expect(log.entries).toContainEqual(
+      expect.objectContaining({
+        fields: expect.objectContaining({ scope: 'stop-child', sessionId: SESSION })
+      })
+    )
     expect(await statusRows()).toEqual(["Codex didn't stop: failed to interrupt turn."])
   })
 
@@ -304,7 +307,11 @@ describe('a Stop that names no turn', () => {
     expect(await stop()).toMatchObject({ ok: true, value: { cancelled: true } })
 
     expect(closeSession).toHaveBeenCalledExactlyOnceWith(SESSION, 'user-stop')
-    expect(onEventSinkError).toHaveBeenCalledWith(expect.objectContaining({ sessionId: SESSION }))
+    expect(log.entries).toContainEqual(
+      expect.objectContaining({
+        fields: expect.objectContaining({ scope: 'stop-child', sessionId: SESSION })
+      })
+    )
     expect(await statusRows()).toEqual(['Cancellation requested.'])
   })
 
diff --git a/src/main/native-chat/agent-session-wire/structured-agent-session-repeat-press.test.ts b/src/main/native-chat/agent-session-wire/structured-agent-session-repeat-press.test.ts
index 0eaaf48448c..a16ef1101a2 100644
--- a/src/main/native-chat/agent-session-wire/structured-agent-session-repeat-press.test.ts
+++ b/src/main/native-chat/agent-session-wire/structured-agent-session-repeat-press.test.ts
@@ -14,6 +14,7 @@ import { openTestAgentSessionRecordStore } from '../../runtime/agent-session-rec
 import { openTestJournalHostDatabase } from '../agent-session-journal/journal-host-database-test-support'
 import type { StructuredAgentSessionAdapter } from './structured-agent-session-adapter'
 import { StructuredAgentSessionHost } from './structured-agent-session-host'
+import { createStructuredAgentSessionLogger } from './structured-agent-session-logger'
 import {
   HOST_TEST_NOW as NOW,
   HOST_TEST_SESSION as SESSION,
@@ -42,6 +43,7 @@ beforeEach(async () => {
   cancelTurn = vi.fn(async () => ({ cancelled: true }))
   store = await openTestAgentSessionRecordStore(root)
   host = new StructuredAgentSessionHost({
+    logger: createStructuredAgentSessionLogger(),
     store,
     adapter: {
       acquire: async ({ fence, spawnToken }) => ({
diff --git a/src/main/native-chat/agent-session-wire/structured-agent-session-repeated-stop.test.ts b/src/main/native-chat/agent-session-wire/structured-agent-session-repeated-stop.test.ts
index b11b9ad19b1..111671350b0 100644
--- a/src/main/native-chat/agent-session-wire/structured-agent-session-repeated-stop.test.ts
+++ b/src/main/native-chat/agent-session-wire/structured-agent-session-repeated-stop.test.ts
@@ -8,6 +8,7 @@ import { openTestAgentSessionRecordStore } from '../../runtime/agent-session-rec
 import { openTestJournalHostDatabase } from '../agent-session-journal/journal-host-database-test-support'
 import type { StructuredAgentSessionAdapter } from './structured-agent-session-adapter'
 import { StructuredAgentSessionHost } from './structured-agent-session-host'
+import { createStructuredAgentSessionLogger } from './structured-agent-session-logger'
 import {
   adapter,
   attach,
@@ -101,6 +102,7 @@ describe('a Stop pressed again', () => {
     await store.renewLeases([])
     const relaunchedStore = await openTestAgentSessionRecordStore(root)
     const relaunched = new StructuredAgentSessionHost({
+      logger: createStructuredAgentSessionLogger(),
       store: relaunchedStore,
       adapter: adapter(),
       journalDatabase: openTestJournalHostDatabase(root),