diff --git a/src/renderer/src/components/native-chat/structured-agent-session-outbox-storage.ts b/src/renderer/src/components/native-chat/structured-agent-session-outbox-storage.ts
index 87bd5991ce4..b823bfe3fa2 100644
--- a/src/renderer/src/components/native-chat/structured-agent-session-outbox-storage.ts
+++ b/src/renderer/src/components/native-chat/structured-agent-session-outbox-storage.ts
@@ -58,6 +58,10 @@ export function enqueueStructuredAgentSessionLaunchPrompt(
   return writeOutbox(sessionId, [...readOutbox(sessionId), entry]) ? entry : null
 }
 
+export function discardStructuredAgentSessionLaunchOutbox(sessionId: string): void {
+  writeOutbox(sessionId, [])
+}
+
 export function mutateStructuredAgentSessionLaunchPrompt(
   sessionId: string,
   clientMessageId: string,
diff --git a/src/renderer/src/lib/structured-agent-session-launch.test.ts b/src/renderer/src/lib/structured-agent-session-launch.test.ts
index 6618c0b360c..5b60e2ae457 100644
--- a/src/renderer/src/lib/structured-agent-session-launch.test.ts
+++ b/src/renderer/src/lib/structured-agent-session-launch.test.ts
@@ -49,6 +49,7 @@ import {
   cancelStructuredCodexLaunch,
   startStructuredCodexLaunch
 } from './structured-agent-session-launch'
+import { readOutbox } from '@/components/native-chat/structured-agent-session-outbox-storage'
 
 function launchIntent(
   worktreeId: string,
@@ -314,6 +315,29 @@ describe('startStructuredCodexLaunch', () => {
     storageFailure.mockRestore()
   })
 
+  it('discards every coalesced prompt when the launch is definitively refused', async () => {
+    const worktreeId = 'wt-refused-coalesced-prompts'
+    const intent = launchIntent(worktreeId)
+    let rejectLaunch!: (error: unknown) => void
+    mocks.createIntent.mockReturnValueOnce(intent)
+    mocks.launch.mockImplementationOnce(
+      () => new Promise((_resolve, reject) => (rejectLaunch = reject))
+    )
+
+    const first = startStructuredCodexLaunch(worktreeId, { prompt: 'first prompt' })
+    startStructuredCodexLaunch(worktreeId, { prompt: 'second prompt' })
+    const fallback = first.claimDefinitiveRefusalFallback(vi.fn())
+    expect(readOutbox(intent.sessionId)).toHaveLength(2)
+
+    rejectLaunch(new StructuredAgentSessionCreateRefusalError('unsupported'))
+    await expect(first.launchResult).rejects.toBeInstanceOf(
+      StructuredAgentSessionCreateRefusalError
+    )
+    await expect(fallback).resolves.toBe(true)
+
+    expect(readOutbox(intent.sessionId)).toEqual([])
+  })
+
   it('cancels a close-racing launch without retrying or toasting', async () => {
     const worktreeId = 'wt-close-race'
     const intent = launchIntent(worktreeId, 'session-close-race')
@@ -335,6 +359,27 @@ describe('startStructuredCodexLaunch', () => {
     expect(toast.error).not.toHaveBeenCalled()
   })
 
+  it('discards every coalesced prompt when a close cancels the launch', async () => {
+    const worktreeId = 'wt-close-coalesced-prompts'
+    const intent = launchIntent(worktreeId)
+    let resolveRefresh!: (snapshots: RuntimeMobileSessionTabsResult[]) => void
+    mocks.createIntent.mockReturnValueOnce(intent)
+    mocks.launch.mockResolvedValueOnce({ sessionId: intent.sessionId, fence: 1 })
+    vi.mocked(refreshLocalStructuredSessionTabs).mockImplementationOnce(
+      () => new Promise((resolve) => (resolveRefresh = resolve))
+    )
+
+    startStructuredCodexLaunch(worktreeId, { prompt: 'first prompt' })
+    startStructuredCodexLaunch(worktreeId, { prompt: 'second prompt' })
+    await vi.waitFor(() => expect(refreshLocalStructuredSessionTabs).toHaveBeenCalledOnce())
+    expect(readOutbox(intent.sessionId)).toHaveLength(2)
+
+    expect(cancelStructuredCodexLaunch(worktreeId, intent.sessionId)).toBe(true)
+    expect(readOutbox(intent.sessionId)).toEqual([])
+    resolveRefresh([])
+    await flushLaunchSettlement()
+  })
+
   it('suppresses a close that races the retry verification catch', async () => {
     const worktreeId = 'wt-retry-close-race'
     const intent = launchIntent(worktreeId, 'session-retry-close-race')
diff --git a/src/renderer/src/lib/structured-agent-session-launch.ts b/src/renderer/src/lib/structured-agent-session-launch.ts
index b71e7084642..25be7287562 100644
--- a/src/renderer/src/lib/structured-agent-session-launch.ts
+++ b/src/renderer/src/lib/structured-agent-session-launch.ts
@@ -6,8 +6,8 @@ import {
   StructuredAgentSessionCreateRefusalError
 } from '@/lib/launch-structured-codex-session'
 import {
-  enqueueStructuredAgentSessionLaunchPrompt,
-  mutateStructuredAgentSessionLaunchPrompt
+  discardStructuredAgentSessionLaunchOutbox,
+  enqueueStructuredAgentSessionLaunchPrompt
 } from '@/components/native-chat/structured-agent-session-outbox-storage'
 import {
   launchAndReconcile,
@@ -30,7 +30,6 @@ type StructuredRefusalFallback = () =>
 
 type StructuredLaunchState = StructuredLaunchRecoveryState & {
   identity: string
-  stagedPromptId: string | null
   promptDeliveryResult?: Promise<StructuredPromptDeliveryResult>
   refusalFallback: {
     callback: StructuredRefusalFallback | null
@@ -67,14 +66,6 @@ function launchIdentity(worktreeId: string): string {
   return worktreeId
 }
 
-function discardStagedPrompt(state: StructuredLaunchState): void {
-  if (!state.stagedPromptId) {
-    return
-  }
-  mutateStructuredAgentSessionLaunchPrompt(state.intent.sessionId, state.stagedPromptId, () => null)
-  state.stagedPromptId = null
-}
-
 function cleanupLaunchState(state: StructuredLaunchState): void {
   if (pendingStructuredLaunchesByIdentity.get(state.identity) === state) {
     pendingStructuredLaunchesByIdentity.delete(state.identity)
@@ -87,7 +78,7 @@ function settleDefinitiveRefusalFallback(state: StructuredLaunchState): void {
   }
   state.refusalFallback.started = true
   abandonStructuredAgentSessionLaunchIntent(state.intent)
-  discardStagedPrompt(state)
+  discardStructuredAgentSessionLaunchOutbox(state.intent.sessionId)
   const fallback = state.refusalFallback.callback
   if (!fallback) {
     state.refusalFallback.resolve(false)
@@ -214,7 +205,6 @@ function structuredCodexLaunchState(
     promise: Promise.resolve({ sessionId: '', fence: 0 }),
     visibilityUnknown: false,
     cancelled: false,
-    stagedPromptId: stagedPrompt?.clientMessageId ?? null,
     refusalFallback: {
       callback: null,
       promise: fallback.promise,
@@ -268,7 +258,7 @@ export function cancelStructuredCodexLaunch(worktreeId: string, sessionId: strin
   }
   state.cancelled = true
   cleanupLaunchState(state)
-  discardStagedPrompt(state)
+  discardStructuredAgentSessionLaunchOutbox(state.intent.sessionId)
   abandonStructuredAgentSessionLaunchIntent(state.intent)
   return true
 }