diff --git a/src/main/codex/codex-session-resume-home.test.ts b/src/main/codex/codex-session-resume-home.test.ts
index f2bf77107a6..6e639e97b0e 100644
--- a/src/main/codex/codex-session-resume-home.test.ts
+++ b/src/main/codex/codex-session-resume-home.test.ts
@@ -5,6 +5,7 @@ import { afterEach, describe, expect, it, vi } from 'vitest'
 import {
   claimsCodexRolloutLayout,
   findTrustedCodexSessionResume,
+  resolveCodexSessionResumeProvenance,
   resolveTrustedCodexSessionResumeHome
 } from './codex-session-resume-home'
 
@@ -269,3 +270,76 @@ describe('claimsCodexRolloutLayout', () => {
     ).toBe(false)
   })
 })
+
+describe('resolveCodexSessionResumeProvenance', () => {
+  function writeRollout(sessionId: string): { homePath: string; rolloutPath: string } {
+    const homePath = mkdtempSync(join(tmpdir(), 'orca-codex-resume-provenance-'))
+    tempRoots.push(homePath)
+    const rolloutPath = join(
+      homePath,
+      'sessions',
+      '2026',
+      '07',
+      '20',
+      `rollout-2026-07-20T12-00-00-${sessionId}.jsonl`
+    )
+    mkdirSync(join(rolloutPath, '..'), { recursive: true })
+    writeFileSync(rolloutPath, 'rollout')
+    return { homePath, rolloutPath }
+  }
+
+  it('starts fresh for a rollout file that really exists under a home Orca no longer trusts', async () => {
+    // Why: the discriminating case — the file is present, so only the trust check can
+    // reject it. Resuming here would run the session under the selected account.
+    const sessionId = '019f81b9-19a9-7651-a8d1-352d9420bd11'
+    const removed = writeRollout(sessionId)
+    const trusted = mkdtempSync(join(tmpdir(), 'orca-codex-resume-provenance-'))
+    tempRoots.push(trusted)
+
+    await expect(
+      resolveCodexSessionResumeProvenance({
+        sessionId,
+        transcriptPath: removed.rolloutPath,
+        trustedCodexHomes: [trusted]
+      })
+    ).resolves.toEqual({ outcome: 'fresh', claimedCodexProvenance: true })
+  })
+
+  it('resumes from the originating home when that home is still trusted', async () => {
+    const sessionId = '019f81b9-19a9-7651-a8d1-352d9420bd11'
+    const origin = writeRollout(sessionId)
+
+    await expect(
+      resolveCodexSessionResumeProvenance({
+        sessionId,
+        transcriptPath: origin.rolloutPath,
+        trustedCodexHomes: [origin.homePath]
+      })
+    ).resolves.toEqual({
+      outcome: 'resume',
+      homePath: origin.homePath,
+      transcriptPath: origin.rolloutPath
+    })
+  })
+
+  it('starts fresh silently for cross-agent provenance on a pane relabeled codex', async () => {
+    await expect(
+      resolveCodexSessionResumeProvenance({
+        sessionId: '019f81b9-19a9-7651-a8d1-352d9420bd11',
+        transcriptPath: '/Users/example/.claude/projects/repo/019f81b9.jsonl',
+        trustedCodexHomes: ['/Users/example/.codex']
+      })
+    ).resolves.toEqual({ outcome: 'fresh', claimedCodexProvenance: false })
+  })
+
+  it('reports a missing rollout under a trusted home as rejected Codex provenance', async () => {
+    await expect(
+      resolveCodexSessionResumeProvenance({
+        sessionId: '019f81b9-19a9-7651-a8d1-352d9420bd11',
+        transcriptPath: '/Users/example/.codex/sessions/2026/07/20/rollout-gone.jsonl',
+        trustedCodexHomes: ['/Users/example/.codex'],
+        fileIsRegular: () => false
+      })
+    ).resolves.toEqual({ outcome: 'fresh', claimedCodexProvenance: true })
+  })
+})
diff --git a/src/main/codex/codex-session-resume-home.ts b/src/main/codex/codex-session-resume-home.ts
index 639d2620eb7..08d701bd00d 100644
--- a/src/main/codex/codex-session-resume-home.ts
+++ b/src/main/codex/codex-session-resume-home.ts
@@ -13,6 +13,15 @@ const ROLLOUT_RELATIVE_PATH = new RegExp(`^${DATED_ROLLOUT_TAIL}$`)
 // Why: case-insensitive because trusted-home matching folds Windows path case too.
 const CODEX_ROLLOUT_LAYOUT_PATH = new RegExp(`(?:^|/)sessions/${DATED_ROLLOUT_TAIL}$`, 'i')
 
+/** `resume` pins CODEX_HOME to the account that owns the rollout. `fresh` means
+ *  provenance could not be verified, so the caller drops the resume argv — an
+ *  unverifiable rollout must never resume under whichever account is selected now.
+ *  `claimedCodexProvenance` gates the user-facing notice: a path that claimed real
+ *  Codex layout is worth reporting, stale cross-agent metadata is not. */
+export type CodexSessionResumePreparation =
+  | { outcome: 'resume'; codexHomePath: string }
+  | { outcome: 'fresh'; claimedCodexProvenance: boolean }
+
 function isCodexRolloutInsideSessionsRoot(sessionsRoot: string, filePath: string): boolean {
   const relativePath = relativePathInsideRoot(sessionsRoot, filePath)
   return Boolean(relativePath && ROLLOUT_RELATIVE_PATH.test(relativePath.replace(/\\/g, '/')))
@@ -93,6 +102,27 @@ export function claimsCodexRolloutLayout(transcriptPath: string | undefined): bo
   return CODEX_ROLLOUT_LAYOUT_PATH.test(persistedPath.replace(/\\/g, '/'))
 }
 
+/**
+ * Verified provenance, or an explicit fall-back to a fresh session. Never rejects:
+ * the caller drops the resume argv on `fresh`, so a rollout Orca cannot place under a
+ * trusted home resumes nowhere instead of resuming under the selected account (#10793).
+ */
+export async function resolveCodexSessionResumeProvenance(args: {
+  sessionId: string
+  transcriptPath: string | undefined
+  trustedCodexHomes: readonly string[]
+  fileIsRegular?: (filePath: string) => boolean
+  listSessionFiles?: (sessionsRoot: string) => AsyncIterable<string>
+}): Promise<
+  | { outcome: 'resume'; homePath: string; transcriptPath: string }
+  | { outcome: 'fresh'; claimedCodexProvenance: boolean }
+> {
+  const sessionSource = await findTrustedCodexSessionResume(args)
+  return sessionSource
+    ? { outcome: 'resume', ...sessionSource }
+    : { outcome: 'fresh', claimedCodexProvenance: claimsCodexRolloutLayout(args.transcriptPath) }
+}
+
 export async function findTrustedCodexSessionResume(args: {
   sessionId: string
   transcriptPath: string | undefined
diff --git a/src/main/codex/codex-unverified-resume-launch.ts b/src/main/codex/codex-unverified-resume-launch.ts
new file mode 100644
index 00000000000..746b5a759ff
--- /dev/null
+++ b/src/main/codex/codex-unverified-resume-launch.ts
@@ -0,0 +1,32 @@
+import { dropAgentResumeArgvFromCommand } from '../../shared/agent-resume-argv-drop'
+import type { AgentProviderSessionMetadata } from '../../shared/agent-session-resume'
+
+export const UNVERIFIED_CODEX_RESUME_ERROR =
+  'Orca could not verify the originating Codex session file, so automatic resume was stopped to avoid using a different account.'
+
+/**
+ * Launch command for a Codex resume whose originating account could not be verified:
+ * the resume argv is dropped so the pane starts a clean session instead of resuming
+ * under whichever account is selected now (#10793). Throws only when the resume
+ * locator is present but not strippable — launching then could still cross accounts.
+ */
+export function dropUnverifiedCodexResumeArgv(args: {
+  command: string | undefined
+  providerSession: AgentProviderSessionMetadata | null
+}): { command: string | undefined; droppedResumeArgv: boolean } {
+  if (!args.command || !args.providerSession) {
+    return { command: args.command, droppedResumeArgv: false }
+  }
+  const drop = dropAgentResumeArgvFromCommand({
+    command: args.command,
+    agent: 'codex',
+    providerSession: args.providerSession
+  })
+  if (drop.status === 'dropped') {
+    return { command: drop.command, droppedResumeArgv: true }
+  }
+  if (drop.status === 'unrecognized') {
+    throw new Error(UNVERIFIED_CODEX_RESUME_ERROR)
+  }
+  return { command: args.command, droppedResumeArgv: false }
+}
diff --git a/src/main/index.ts b/src/main/index.ts
index ec2dbdc1b63..5c885e8771b 100644
--- a/src/main/index.ts
+++ b/src/main/index.ts
@@ -173,8 +173,8 @@ import { createCodexSessionMigrationScheduler } from './codex/codex-session-migr
 import { prepareLegacySharedCodexSessionResume } from './codex/codex-legacy-session-resume'
 import { resolveHostCodexSessionSourceHome } from './codex/codex-session-source-home'
 import {
-  claimsCodexRolloutLayout,
-  findTrustedCodexSessionResume
+  resolveCodexSessionResumeProvenance,
+  type CodexSessionResumePreparation
 } from './codex/codex-session-resume-home'
 import { getSystemCodexHomePath } from './codex/codex-home-paths'
 import { normalizeRuntimePathForComparison } from '../shared/cross-platform-path'
@@ -839,7 +839,7 @@ async function prepareCodexSessionResumeForLaunch(args: {
   target: CodexAccountSelectionTarget
   launchEnv?: NodeJS.ProcessEnv
   workspacePath?: string
-}): Promise<{ codexHomePath: string | null } | null> {
+}): Promise<CodexSessionResumePreparation | null> {
   if (args.target.runtime === 'wsl' || !codexRuntimeHome || !store) {
     return null
   }
@@ -849,20 +849,15 @@ async function prepareCodexSessionResumeForLaunch(args: {
     systemHomePath,
     ...codexRuntimeHome.getHostCodexHomePathsForSessionDiscovery()
   ]
-  const sessionSource = await findTrustedCodexSessionResume({
+  const sessionSource = await resolveCodexSessionResumeProvenance({
     sessionId: args.providerSession.id,
     transcriptPath: args.providerSession.transcriptPath,
     trustedCodexHomes: trustedHomes
   })
-  if (!sessionSource) {
-    // Why: an unverifiable Codex rollout still blocks; only paths that never claimed Codex
-    // provenance (e.g. ~/.claude/… on a pane mislabeled "codex") fall through to a normal launch.
-    if (claimsCodexRolloutLayout(args.providerSession.transcriptPath)) {
-      throw new Error(
-        'Orca could not verify the originating Codex session file, so automatic resume was stopped to avoid using a different account.'
-      )
-    }
-    return null
+  if (sessionSource.outcome === 'fresh') {
+    // Why: unverifiable provenance drops the resume argv instead of failing the spawn —
+    // with nothing to resume, cross-account resume is impossible by construction (#10793).
+    return sessionSource
   }
 
   let migrated = { useRealCodexHome: false }
@@ -911,7 +906,7 @@ async function prepareCodexSessionResumeForLaunch(args: {
     // Why: hook repair is best-effort; session provenance must still win over the currently selected home.
     console.warn('[codex-hook-service] failed to prepare automatic resume home:', error)
   }
-  return { codexHomePath: resumeHome }
+  return { outcome: 'resume', codexHomePath: resumeHome }
 }
 
 // Why: restore the window the close handler may have hidden to tray, or reopen it (dock-reactivation style) if fully torn down.
diff --git a/src/main/ipc/pty.test.ts b/src/main/ipc/pty.test.ts
index f10355161e7..b04566a209f 100644
--- a/src/main/ipc/pty.test.ts
+++ b/src/main/ipc/pty.test.ts
@@ -2,6 +2,7 @@
 import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
 import { userInfo } from 'node:os'
 import { delimiter, join, posix } from 'node:path'
+import { resolveCodexSessionResumeProvenance } from '../codex/codex-session-resume-home'
 import {
   TERMINAL_INPUT_CHUNK_MAX_BYTES,
   TERMINAL_INPUT_MAX_BYTES
@@ -1734,7 +1735,10 @@ describe('registerPtyHandlers', () => {
 
     it('resumes an automatic Codex session from its prepared originating home', async () => {
       const selectedHome = vi.fn(() => '/managed/current/home')
-      const prepareResume = vi.fn(async () => ({ codexHomePath: '/managed/origin/home' }))
+      const prepareResume = vi.fn(async () => ({
+        outcome: 'resume' as const,
+        codexHomePath: '/managed/origin/home'
+      }))
       registerPtyHandlers(
         mainWindow as never,
         undefined,
@@ -1779,7 +1783,12 @@ describe('registerPtyHandlers', () => {
         undefined,
         undefined,
         undefined,
-        { prepareCodexSessionResume: async () => ({ codexHomePath: systemHome }) }
+        {
+          prepareCodexSessionResume: async () => ({
+            outcome: 'resume' as const,
+            codexHomePath: systemHome
+          })
+        }
       )
 
       await handlers.get('pty:spawn')!(null, {
@@ -1837,6 +1846,136 @@ describe('registerPtyHandlers', () => {
       expect(spawnMock).not.toHaveBeenCalled()
     })
 
+    describe('unverifiable Codex resume provenance', () => {
+      const RESUME_SESSION_ID = '019f81b9-19a9-7651-a8d1-352d9420bd11'
+      const ORIGIN_HOME = '/managed/origin/home'
+      const OTHER_HOME = '/managed/other/home'
+      const ORIGIN_ROLLOUT = `${ORIGIN_HOME}/sessions/2026/07/20/rollout-2026-07-20T12-00-00-${RESUME_SESSION_ID}.jsonl`
+
+      // Why: main's real provenance rule, so these cases exercise the same decision
+      // prepareCodexSessionResumeForLaunch makes instead of a hand-written stub. This
+      // suite mocks fs, so the rollout is declared present — the only variable left is
+      // whether its home is trusted, which is exactly the case the guard exists for.
+      function registerWithTrustedHomes(trustedHomes: readonly string[], selectedHome: string) {
+        const selectedHomeMock = vi.fn(() => selectedHome)
+        registerPtyHandlers(
+          mainWindow as never,
+          undefined,
+          selectedHomeMock,
+          undefined,
+          undefined,
+          undefined,
+          {
+            prepareCodexSessionResume: async ({ providerSession }) => {
+              const provenance = await resolveCodexSessionResumeProvenance({
+                sessionId: providerSession.id,
+                transcriptPath: providerSession.transcriptPath,
+                trustedCodexHomes: trustedHomes,
+                fileIsRegular: () => true
+              })
+              return provenance.outcome === 'resume'
+                ? { outcome: 'resume' as const, codexHomePath: provenance.homePath }
+                : provenance
+            }
+          }
+        )
+        return selectedHomeMock
+      }
+
+      async function spawnCodexResume(
+        transcriptPath: string | undefined
+      ): Promise<{ agentResumeUnavailable?: true }> {
+        return (await handlers.get('pty:spawn')!(null, {
+          cols: 80,
+          rows: 24,
+          cwd: '/tmp',
+          command: `codex 'resume' '${RESUME_SESSION_ID}'`,
+          launchAgent: 'codex',
+          resumeProviderSession: {
+            key: 'session_id',
+            id: RESUME_SESSION_ID,
+            ...(transcriptPath ? { transcriptPath } : {})
+          }
+        })) as { agentResumeUnavailable?: true }
+      }
+
+      posixOnlyIt(
+        'launches plain codex when a REAL rollout sits under a home Orca no longer trusts',
+        async () => {
+          // Why: the discriminating case — the rollout exists, so only the trust check can
+          // reject it. Falling through would resume it under the selected account.
+          const mockProc = createMockProc()
+          spawnMock.mockReturnValue(mockProc.proc)
+          vi.useFakeTimers()
+
+          try {
+            const selectedHome = registerWithTrustedHomes([OTHER_HOME], OTHER_HOME)
+            const spawned = await spawnCodexResume(ORIGIN_ROLLOUT)
+
+            await Promise.resolve()
+            vi.runAllTimers()
+            await Promise.resolve()
+            vi.runAllTimers()
+
+            expect(mockProc.proc.write).toHaveBeenCalledWith('codex\n')
+            expect(mockProc.proc.write).not.toHaveBeenCalledWith(
+              expect.stringContaining(RESUME_SESSION_ID)
+            )
+            expect(spawned.agentResumeUnavailable).toBe(true)
+            // The pane still runs under the selected account — but with nothing to resume.
+            const env = spawnMock.mock.calls.at(-1)![2].env as Record<string, string>
+            expect(env.CODEX_HOME).toBe(OTHER_HOME)
+            expect(selectedHome).toHaveBeenCalled()
+          } finally {
+            vi.useRealTimers()
+          }
+        }
+      )
+
+      it('reports the dropped resume so the pane can say it started fresh', async () => {
+        registerWithTrustedHomes([OTHER_HOME], OTHER_HOME)
+        const spawned = await spawnCodexResume(ORIGIN_ROLLOUT)
+
+        expect(spawned.agentResumeUnavailable).toBe(true)
+      })
+
+      it('stays silent for cross-agent provenance on a pane relabeled codex', async () => {
+        registerWithTrustedHomes([OTHER_HOME], OTHER_HOME)
+
+        const spawned = await spawnCodexResume(
+          '/Users/example/.claude/projects/repo/019f81b9.jsonl'
+        )
+
+        expect(spawned.agentResumeUnavailable).toBeUndefined()
+      })
+
+      posixOnlyIt('still pins CODEX_HOME and resumes when provenance is verified', async () => {
+        const mockProc = createMockProc()
+        spawnMock.mockReturnValue(mockProc.proc)
+        vi.useFakeTimers()
+
+        try {
+          const selectedHome = registerWithTrustedHomes([ORIGIN_HOME], OTHER_HOME)
+          const spawned = await spawnCodexResume(ORIGIN_ROLLOUT)
+
+          await Promise.resolve()
+          vi.runAllTimers()
+          await Promise.resolve()
+          vi.runAllTimers()
+
+          expect(mockProc.proc.write).toHaveBeenCalledWith(
+            `codex 'resume' '${RESUME_SESSION_ID}'\n`
+          )
+          expect(spawned.agentResumeUnavailable).toBeUndefined()
+          const env = spawnMock.mock.calls.at(-1)![2].env as Record<string, string>
+          expect(env.CODEX_HOME).toBe(ORIGIN_HOME)
+          expect(selectedHome).not.toHaveBeenCalled()
+        } finally {
+          vi.useRealTimers()
+        }
+      })
+    })
+
     it('prepares Codex launch state for the workspace before spawning an interactive tab', async () => {
       const workspacePath = '/repo/worktrees/new-feature'
       const resolveHome = vi.fn(
@@ -2653,7 +2792,12 @@ describe('registerPtyHandlers', () => {
           undefined,
           undefined,
           undefined,
-          { prepareCodexSessionResume: async () => ({ codexHomePath: systemHome }) }
+          {
+            prepareCodexSessionResume: async () => ({
+              outcome: 'resume' as const,
+              codexHomePath: systemHome
+            })
+          }
         )
 
         await handlers.get('pty:spawn')!(null, {
@@ -2711,7 +2855,12 @@ describe('registerPtyHandlers', () => {
           undefined,
           undefined,
           undefined,
-          { prepareCodexSessionResume: async () => ({ codexHomePath: systemHome }) }
+          {
+            prepareCodexSessionResume: async () => ({
+              outcome: 'resume' as const,
+              codexHomePath: systemHome
+            })
+          }
         )
         const controller = runtime.setPtyController.mock.calls[0]?.[0] as RuntimeSpawnController
 
diff --git a/src/main/ipc/pty.ts b/src/main/ipc/pty.ts
index ff089432508..db6d5e6e626 100644
--- a/src/main/ipc/pty.ts
+++ b/src/main/ipc/pty.ts
@@ -163,6 +163,8 @@ import { validateTerminalViewAttributes } from '../../shared/terminal-view-attri
 import type { PtyModelRestoreReason } from '../../shared/pty-model-restore-marker'
 import type { CodexAccountSelectionTarget } from '../codex-accounts/runtime-selection'
 import { isCodexSystemDefaultRealHomeEnabled } from '../codex/codex-real-home-flag'
+import type { CodexSessionResumePreparation } from '../codex/codex-session-resume-home'
+import { dropUnverifiedCodexResumeArgv } from '../codex/codex-unverified-resume-launch'
 import { isHostCodexHomeForWsl, isWslCodexHomeForHost } from '../pty/codex-home-wsl-env'
 import { buildConfiguredProxyEnv, type NetworkProxySettings } from '../../shared/network-proxy'
 import { resolveSetupAgentSequenceLaunchCommand } from '../../shared/setup-agent-sequencing'
@@ -787,7 +789,7 @@ export type PrepareCodexSessionResume = (args: {
   target: CodexAccountSelectionTarget
   launchEnv?: NodeJS.ProcessEnv
   workspacePath?: string
-}) => Promise<{ codexHomePath: string | null } | null>
+}) => Promise<CodexSessionResumePreparation | null>
 type PrepareClaudeAuth = (
   target?: ClaudeAccountSelectionTarget
 ) => Promise<ClaudeRuntimeAuthPreparation>
@@ -3126,7 +3128,10 @@ export function registerPtyHandlers(
     target: CodexAccountSelectionTarget
     launchEnv?: NodeJS.ProcessEnv
     workspacePath?: string
-  }): Promise<{ codexHomePath: string | null } | null> | null => {
+  }): {
+    providerSession: AgentProviderSessionMetadata
+    preparation: Promise<CodexSessionResumePreparation | null>
+  } | null => {
     if (args.connectionId || args.launchAgent !== 'codex' || !options?.prepareCodexSessionResume) {
       return null
     }
@@ -3134,14 +3139,52 @@ export function registerPtyHandlers(
     if (!providerSession) {
       return null
     }
-    return options.prepareCodexSessionResume({
+    return {
       providerSession,
-      target: args.target,
-      launchEnv: args.launchEnv,
-      workspacePath: args.workspacePath
-    })
+      preparation: options.prepareCodexSessionResume({
+        providerSession,
+        target: args.target,
+        launchEnv: args.launchEnv,
+        workspacePath: args.workspacePath
+      })
+    }
   }
 
+  type CodexResumeLaunch = {
+    codexResumeHome: { codexHomePath: string } | null
+    command: string | undefined
+    notifyResumeUnavailable: boolean
+  }
+
+  /** Kept separate from resolveCodexResumeLaunch so non-Codex spawns never await:
+   *  an extra tick reorders the pane-spawn reservation races this handler arbitrates. */
+  const noCodexResumeLaunch = (command: string | undefined): CodexResumeLaunch => ({
+    codexResumeHome: null,
+    command,
+    notifyResumeUnavailable: false
+  })
+
+  /** The command a Codex launch actually runs: unchanged when provenance is verified,
+   *  stripped of `resume <id>` when it is not. */
+  const resolveCodexResumeLaunch = (
+    command: string | undefined,
+    preparation: NonNullable<ReturnType<typeof prepareCodexResumeHome>>
+  ): Promise<CodexResumeLaunch> =>
+    preparation.preparation.then((prepared) => {
+      if (prepared?.outcome !== 'fresh') {
+        return { codexResumeHome: prepared ?? null, command, notifyResumeUnavailable: false }
+      }
+      const dropped = dropUnverifiedCodexResumeArgv({
+        command,
+        providerSession: preparation.providerSession
+      })
+      return {
+        codexResumeHome: null,
+        command: dropped.command,
+        notifyResumeUnavailable: dropped.droppedResumeArgv && prepared.claimedCodexProvenance
+      }
+    })
+
   // Why: route through getProviderForPty() so CLI commands work for remote PTYs too; localProvider would silently fail for them.
   runtime?.setPtyController({
     spawn: async (args) => {
@@ -3180,7 +3223,11 @@ export function registerPtyHandlers(
         launchEnv: args.env,
         workspacePath: cwd
       })
-      const codexResumeHome = codexResumePreparation ? await codexResumePreparation : null
+      const codexResumeLaunch = codexResumePreparation
+        ? await resolveCodexResumeLaunch(args.command, codexResumePreparation)
+        : noCodexResumeLaunch(args.command)
+      const codexResumeHome = codexResumeLaunch.codexResumeHome
+      const launchCommand = codexResumeLaunch.command
       const claudeAuth =
         isClaudeLaunch && prepareClaudeAuth ? await prepareClaudeAuth(codexSelectionTarget) : null
       if (isClaudeLaunch && isClaudeAuthSwitchInProgress()) {
@@ -3286,7 +3333,7 @@ export function registerPtyHandlers(
           skipCodexHomeEnv,
           stripInheritedOrcaCodexHome,
           githubAttributionEnabled: getSettings?.()?.enableGitHubAttribution ?? false,
-          launchCommand: args.command,
+          launchCommand,
           launchAgent: isTuiAgent(args.launchAgent) ? args.launchAgent : undefined,
           shellPath: daemonShellOverride ?? process.env.COMSPEC,
           isWsl: shouldSkipCodexHomeEnvForWindowsShell(daemonShellOverride, cwd),
@@ -3347,8 +3394,8 @@ export function registerPtyHandlers(
       }
       deleteRequestedEnvKeys(env, spawnOptions.envToDelete)
       promoteAgentTeamsShimPath(env, requestedAgentTeamsPath)
-      if (args.command !== undefined) {
-        spawnOptions.command = args.command
+      if (launchCommand !== undefined) {
+        spawnOptions.command = launchCommand
       }
       if (args.commandDelivery !== undefined) {
         spawnOptions.commandDelivery = args.commandDelivery
@@ -3742,7 +3789,7 @@ export function registerPtyHandlers(
           runtime?.cancelPendingPtyRegistration?.(result.id, result.incarnationId)
         }
         // Why: arms main's per-PTY Command Code output detector from the launch command (renderer startupCommand parity).
-        runtime?.noteTerminalSpawnCommand?.(result.id, args.command ?? null)
+        runtime?.noteTerminalSpawnCommand?.(result.id, launchCommand ?? null)
         if (isClaudeLaunch) {
           markClaudePtySpawned(result.id)
         }
@@ -4400,7 +4447,11 @@ export function registerPtyHandlers(
         launchEnv: baseEnv,
         workspacePath: cwd
       })
-      const codexResumeHome = codexResumePreparation ? await codexResumePreparation : null
+      const codexResumeLaunch = codexResumePreparation
+        ? await resolveCodexResumeLaunch(args.command, codexResumePreparation)
+        : noCodexResumeLaunch(args.command)
+      const codexResumeHome = codexResumeLaunch.codexResumeHome
+      const launchCommand = codexResumeLaunch.command
       const selectedCodexHomePath = isDaemonHostSpawn
         ? getCompatibleSelectedCodexHomePath(
             codexSelectionTarget,
@@ -4444,7 +4495,7 @@ export function registerPtyHandlers(
             skipCodexHomeEnv,
             stripInheritedOrcaCodexHome,
             githubAttributionEnabled: getSettings?.()?.enableGitHubAttribution ?? false,
-            launchCommand: args.command,
+            launchCommand,
             launchAgent: isTuiAgent(args.launchAgent) ? args.launchAgent : undefined,
             shellPath: effectiveShellOverride ?? process.env.COMSPEC,
             isWsl: shouldSkipCodexHomeEnvForWindowsShell(effectiveShellOverride, cwd),
@@ -4504,8 +4555,8 @@ export function registerPtyHandlers(
       if (combinedEnvToDelete) {
         spawnOptions.envToDelete = combinedEnvToDelete
       }
-      if (args.command !== undefined) {
-        spawnOptions.command = args.command
+      if (launchCommand !== undefined) {
+        spawnOptions.command = launchCommand
       }
       if (args.commandDelivery !== undefined) {
         spawnOptions.commandDelivery = args.commandDelivery
@@ -4877,7 +4928,7 @@ export function registerPtyHandlers(
         // Why: arm main's per-PTY Command Code output detector from the launch command (startupCommand parity); banner detection covers PTYs without one.
         runtime?.noteTerminalSpawnCommand?.(
           result.id,
-          typeof args.command === 'string' ? args.command : null
+          typeof launchCommand === 'string' ? launchCommand : null
         )
         if (isClaudeLaunch) {
           markClaudePtySpawned(result.id)
@@ -4947,7 +4998,12 @@ export function registerPtyHandlers(
             ? { launchConfig: effectiveLaunchConfig }
             : {}),
           // Why: a daemon-retry race can surface isReattach even for a minted session id, and a reattach must never claim its cwd was remapped.
-          ...(startupCwdFallback && !result.isReattach ? { startupCwdFallback } : {})
+          ...(startupCwdFallback && !result.isReattach ? { startupCwdFallback } : {}),
+          // Why: the pane asked to resume and got a fresh session instead; only the
+          // renderer can say so, and a reattach never ran this launch command.
+          ...(codexResumeLaunch.notifyResumeUnavailable && !result.isReattach
+            ? { agentResumeUnavailable: true as const }
+            : {})
         }
         // Why: renderer tab state cannot reliably infer background and reattached PTYs in the daemon inventory.
         sendPtySpawnedToRenderer(result.id)
diff --git a/src/preload/api-types.ts b/src/preload/api-types.ts
index 2592e08e9e6..568b060528d 100644
--- a/src/preload/api-types.ts
+++ b/src/preload/api-types.ts
@@ -1335,6 +1335,7 @@ export type PreloadApi = {
       sessionExpired?: boolean
       coldRestore?: { scrollback: string; cwd: string; cols?: number; rows?: number }
       startupCwdFallback?: { kind: 'worktree'; cwd: string }
+      agentResumeUnavailable?: true
     }>
     write: (id: string, data: string) => void
     writeAccepted: (id: string, data: string) => Promise<boolean>
diff --git a/src/preload/index.ts b/src/preload/index.ts
index 21014fc1a35..51702c8a9f9 100644
--- a/src/preload/index.ts
+++ b/src/preload/index.ts
@@ -837,6 +837,7 @@ const api = {
       sessionExpired?: boolean
       coldRestore?: { scrollback: string; cwd: string; cols?: number; rows?: number }
       startupCwdFallback?: { kind: 'worktree'; cwd: string }
+      agentResumeUnavailable?: true
     }> => ipcRenderer.invoke('pty:spawn', opts),
 
     write: (id: string, data: string): void => {
diff --git a/src/renderer/src/components/terminal-pane/SessionRestoredBanner.tsx b/src/renderer/src/components/terminal-pane/SessionRestoredBanner.tsx
index 2f4c4959713..47976abc73b 100644
--- a/src/renderer/src/components/terminal-pane/SessionRestoredBanner.tsx
+++ b/src/renderer/src/components/terminal-pane/SessionRestoredBanner.tsx
@@ -1,15 +1,27 @@
+import type { SessionRestoredBannerReason } from './session-restored-banner-pane-state'
+
 export const SESSION_RESTORED_BANNER_TEXT = '--- session restored ---'
+export const SESSION_RESUME_UNAVAILABLE_BANNER_TEXT =
+  '--- previous session unavailable, started fresh ---'
 
 type SessionRestoredBannerProps = {
   visible: boolean
+  reason?: SessionRestoredBannerReason
 }
 
 export function SessionRestoredBanner({
-  visible
+  visible,
+  reason = 'restored'
 }: SessionRestoredBannerProps): React.JSX.Element | null {
   if (!visible) {
     return null
   }
 
-  return <div className="session-restored-banner">{SESSION_RESTORED_BANNER_TEXT}</div>
+  return (
+    <div className="session-restored-banner">
+      {reason === 'resume-unavailable'
+        ? SESSION_RESUME_UNAVAILABLE_BANNER_TEXT
+        : SESSION_RESTORED_BANNER_TEXT}
+    </div>
+  )
 }
diff --git a/src/renderer/src/components/terminal-pane/SessionRestoredBannerPortals.tsx b/src/renderer/src/components/terminal-pane/SessionRestoredBannerPortals.tsx
index ecc52befa2c..d4c7d0afba9 100644
--- a/src/renderer/src/components/terminal-pane/SessionRestoredBannerPortals.tsx
+++ b/src/renderer/src/components/terminal-pane/SessionRestoredBannerPortals.tsx
@@ -1,10 +1,13 @@
 import { createPortal } from 'react-dom'
 import { SessionRestoredBanner } from './SessionRestoredBanner'
-import type { SessionRestoredBannerPane } from './session-restored-banner-pane-state'
+import type {
+  SessionRestoredBannerPane,
+  SessionRestoredBannerPaneReasons
+} from './session-restored-banner-pane-state'
 
 type SessionRestoredBannerPortalsProps = {
   panes: readonly SessionRestoredBannerPane[]
-  paneIds: ReadonlySet<number>
+  paneIds: SessionRestoredBannerPaneReasons
 }
 
 export function SessionRestoredBannerPortals({
@@ -14,13 +17,14 @@ export function SessionRestoredBannerPortals({
   return (
     <>
       {panes.map((pane) => {
-        if (!paneIds.has(pane.id)) {
+        const reason = paneIds.get(pane.id)
+        if (!reason) {
           return null
         }
         return createPortal(
           // Why: resumed TUIs repaint xterm immediately, so the wake marker
           // must live in that pane's chrome instead of the PTY byte stream.
-          <SessionRestoredBanner visible />,
+          <SessionRestoredBanner visible reason={reason} />,
           pane.container,
           `session-restored-banner-${pane.id}`
         )
diff --git a/src/renderer/src/components/terminal-pane/TerminalPane.tsx b/src/renderer/src/components/terminal-pane/TerminalPane.tsx
index 20bc410c681..c31e6d96852 100644
--- a/src/renderer/src/components/terminal-pane/TerminalPane.tsx
+++ b/src/renderer/src/components/terminal-pane/TerminalPane.tsx
@@ -76,7 +76,8 @@ import {
   pruneSessionRestoredBannerPaneIds,
   removeSessionRestoredBannerPaneId,
   syncSessionRestoredBannerTitleSpace,
-  type SessionRestoredBannerDismissEvent
+  type SessionRestoredBannerDismissEvent,
+  type SessionRestoredBannerReason
 } from './session-restored-banner-pane-state'
 import { useSystemPrefersDark } from './use-system-prefers-dark'
 import { useTerminalPaneGlobalEffects } from './use-terminal-pane-global-effects'
@@ -790,9 +791,9 @@ export default function TerminalPane({
   const [shouldMeasureHiddenStartup, setShouldMeasureHiddenStartup] = useState(
     () => startup !== undefined && !isVisible
   )
-  const [sessionRestoredBannerPaneIds, setSessionRestoredBannerPaneIds] = useState<Set<number>>(
-    () => new Set()
-  )
+  const [sessionRestoredBannerPaneIds, setSessionRestoredBannerPaneIds] = useState<
+    Map<number, SessionRestoredBannerReason>
+  >(() => new Map())
   const consumeTabStartupCommand = useAppStore((store) => store.consumeTabStartupCommand)
   const [setupSplit] = useState(() => useAppStore.getState().pendingSetupSplitByTabId[tabId])
   const consumeTabSetupSplit = useAppStore((store) => store.consumeTabSetupSplit)
@@ -824,12 +825,15 @@ export default function TerminalPane({
     })
   }, [])
 
-  const showRestoredSessionBanner = useCallback((paneId: number): void => {
-    setSessionRestoredBannerPaneIds((prev) => {
-      const next = addSessionRestoredBannerPaneId(prev, paneId)
-      return next === prev ? prev : next
-    })
-  }, [])
+  const showRestoredSessionBanner = useCallback(
+    (paneId: number, reason: SessionRestoredBannerReason = 'restored'): void => {
+      setSessionRestoredBannerPaneIds((prev) => {
+        const next = addSessionRestoredBannerPaneId(prev, paneId, reason)
+        return next === prev ? prev : next
+      })
+    },
+    []
+  )
 
   const dismissSessionRestoredBanner = useCallback(
     (event: SessionRestoredBannerDismissEvent): void => {
diff --git a/src/renderer/src/components/terminal-pane/pty-connection-types.ts b/src/renderer/src/components/terminal-pane/pty-connection-types.ts
index bfd2d97ee02..bcbae661a6a 100644
--- a/src/renderer/src/components/terminal-pane/pty-connection-types.ts
+++ b/src/renderer/src/components/terminal-pane/pty-connection-types.ts
@@ -1,4 +1,5 @@
 import type { PtyTransport } from './pty-transport'
+import type { SessionRestoredBannerReason } from './session-restored-banner-pane-state'
 import type { ReplayingPanesRef } from './replay-guard'
 import type { RestoredViewportBlankingPanesRef } from './terminal-restored-viewport'
 import type { AgentCompletionStatusSnapshot } from './agent-completion-coordinator-types'
@@ -76,7 +77,7 @@ export type PtyConnectionDeps = {
   clearWorktreeUnread: (worktreeId: string) => void
   clearTerminalTabUnread: (tabId: string) => void
   clearTerminalPaneUnread: (paneKey: string) => void
-  onShowSessionRestoredBanner: (paneId: number) => void
+  onShowSessionRestoredBanner: (paneId: number, reason?: SessionRestoredBannerReason) => void
   // Why: the renderer dispatches two notification sources — BEL from the PTY
   // byte stream and agent-task-complete on the working→idle title transition.
   // shared/types.ts keeps a wider NotificationEventSource union because the
diff --git a/src/renderer/src/components/terminal-pane/pty-connection.test.ts b/src/renderer/src/components/terminal-pane/pty-connection.test.ts
index ca3b9cb777c..8b152c96f45 100644
--- a/src/renderer/src/components/terminal-pane/pty-connection.test.ts
+++ b/src/renderer/src/components/terminal-pane/pty-connection.test.ts
@@ -8102,7 +8102,7 @@ describe('connectPanePty', () => {
     const writeCalls = pane.terminal.write.mock.calls.map(([data]) => data)
     expect(writeCalls.findIndex((data) => data.includes('--- session restored ---'))).toBe(-1)
     expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledTimes(1)
-    expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledWith(1)
+    expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledWith(1, 'restored')
     expect(transport.sendInput).not.toHaveBeenCalled()
     expect(transport.connect).toHaveBeenCalledWith(
       expect.objectContaining({
@@ -8121,6 +8121,63 @@ describe('connectPanePty', () => {
     expect(mockStoreState.clearSleepingAgentSession).toHaveBeenCalledWith(paneKey)
   })
 
+  it('marks the pane as freshly started when main declined an unverifiable resume', async () => {
+    const { connectPanePty } = await import('./pty-connection')
+    const transport = createMockTransport('fresh-pty')
+    transport.connect.mockImplementation(async ({ sessionId }: { sessionId?: string }) => {
+      if (sessionId) {
+        // Why: main dropped `resume <id>` because it could not verify which Codex
+        // account owns the rollout, so this PTY is a new session, not a restore.
+        return {
+          id: 'fresh-pty',
+          coldRestore: { scrollback: 'cold-payload', cwd: '/tmp/wt-1' },
+          agentResumeUnavailable: true as const
+        }
+      }
+      return 'fresh-pty'
+    })
+    transportFactoryQueue.push(transport)
+    const paneKey = makePaneKey('tab-1', LEAF_1)
+    mockStoreState = {
+      ...mockStoreState,
+      tabsByWorktree: {
+        'wt-1': [{ id: 'tab-1', ptyId: 'lost-pty' }]
+      },
+      settings: {
+        ...mockStoreState.settings,
+        agentCmdOverrides: {}
+      },
+      agentStatusByPaneKey: {},
+      sleepingAgentSessionsByPaneKey: {
+        [paneKey]: {
+          paneKey,
+          tabId: 'tab-1',
+          worktreeId: 'wt-1',
+          agent: 'codex',
+          providerSession: { key: 'session_id', id: 'codex-session-1' },
+          prompt: 'finish the task',
+          state: 'working',
+          capturedAt: 1,
+          updatedAt: 1
+        }
+      }
+    } as StoreState
+
+    const pane = createPane(1)
+    const manager = createManager(1)
+    const deps = createDeps({
+      restoredLeafId: LEAF_1,
+      restoredPtyIdByLeafId: { [LEAF_1]: 'lost-pty' }
+    })
+
+    connectPanePty(pane as never, manager as never, deps as never)
+    await flushAsyncTicks(20)
+    await new Promise((resolve) => setTimeout(resolve, 70))
+
+    expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledTimes(1)
+    expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledWith(1, 'resume-unavailable')
+  })
+
   it('resumes from an unambiguous legacy sleeping record when cold-restoring a preserved pane', async () => {
     const { connectPanePty } = await import('./pty-connection')
     const transport = createMockTransport('fresh-pty')
@@ -8184,7 +8241,7 @@ describe('connectPanePty', () => {
     await new Promise((resolve) => setTimeout(resolve, 70))
 
     expect(pane.terminal.write).toHaveBeenCalledWith('cold-payload', expect.any(Function))
-    expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledWith(1)
+    expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledWith(1, 'restored')
     expect(transport.sendInput).not.toHaveBeenCalled()
     expect(transport.connect).toHaveBeenCalledWith(
       expect.objectContaining({
@@ -8694,7 +8751,7 @@ describe('connectPanePty', () => {
       expect.any(Function)
     )
     expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledTimes(1)
-    expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledWith(2)
+    expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledWith(2, 'restored')
     expect(mockStoreState.clearSleepingAgentSession).toHaveBeenCalledWith(paneKey)
   })
 
@@ -8797,7 +8854,7 @@ describe('connectPanePty', () => {
     await flushAsyncTicks(10)
 
     expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledTimes(1)
-    expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledWith(2)
+    expect(deps.onShowSessionRestoredBanner).toHaveBeenCalledWith(2, 'restored')
     expect(mockStoreState.clearSleepingAgentSession).toHaveBeenCalledWith(paneKey)
   })
 
diff --git a/src/renderer/src/components/terminal-pane/pty-connection.ts b/src/renderer/src/components/terminal-pane/pty-connection.ts
index af467597005..77623c9e8cd 100644
--- a/src/renderer/src/components/terminal-pane/pty-connection.ts
+++ b/src/renderer/src/components/terminal-pane/pty-connection.ts
@@ -50,6 +50,7 @@ import {
   type HasPty
 } from './terminal-dead-session-reconcile'
 import type { PtyConnectionDeps } from './pty-connection-types'
+import type { SessionRestoredBannerReason } from './session-restored-banner-pane-state'
 import {
   consumeCommittedPtyShutdownExit,
   deferPtyShutdownExit,
@@ -4502,12 +4503,12 @@ export function connectPanePty(
       armStartupDraftReadinessObservation()
     }
     let sessionRestoredBannerShown = false
-    const showSessionRestoredBanner = (): void => {
+    const showSessionRestoredBanner = (reason: SessionRestoredBannerReason = 'restored'): void => {
       if (sessionRestoredBannerShown) {
         return
       }
       sessionRestoredBannerShown = true
-      deps.onShowSessionRestoredBanner(pane.id)
+      deps.onShowSessionRestoredBanner(pane.id, reason)
     }
     const getColdRestoreAgentResumePlatform = (): NodeJS.Platform => {
       if (projectRuntime?.status === 'repair-required') {
@@ -4849,7 +4850,15 @@ export function connectPanePty(
                 foreground: shouldWritePtyOutputForeground(deps.isVisibleRef.current)
               })
             }
-            if (coldRestoreOverride?.hasSleepingRecord) {
+            if (
+              spawnedPtyId &&
+              typeof spawnedPtyId === 'object' &&
+              spawnedPtyId.agentResumeUnavailable
+            ) {
+              // Why: main dropped the resume argv, so this pane is a NEW session —
+              // the plain restored banner would claim the old one came back.
+              showSessionRestoredBanner('resume-unavailable')
+            } else if (coldRestoreOverride?.hasSleepingRecord) {
               showSessionRestoredBanner()
             }
             clearSleepingRecordAfterColdRestoreSpawn(coldRestoreOverride)
@@ -7443,7 +7452,11 @@ export function connectPanePty(
           const preparedStartup = coldRestoreStartup ?? buildColdRestoreAgentResumeStartup()
           const didPrepareResume = applyColdRestoreAgentResumeStartup(preparedStartup)
           if (didPrepareResume) {
-            if (preparedStartup?.hasSleepingRecord) {
+            if (connectResult.agentResumeUnavailable) {
+              // Why: main dropped the resume argv, so this pane is a NEW session —
+              // the plain restored banner would claim the old one came back.
+              showSessionRestoredBanner('resume-unavailable')
+            } else if (preparedStartup?.hasSleepingRecord) {
               showSessionRestoredBanner()
             }
             clearSleepingRecordAfterColdRestoreSpawn(preparedStartup)
diff --git a/src/renderer/src/components/terminal-pane/pty-transport-types.ts b/src/renderer/src/components/terminal-pane/pty-transport-types.ts
index 81cfd5575be..804655edbdf 100644
--- a/src/renderer/src/components/terminal-pane/pty-transport-types.ts
+++ b/src/renderer/src/components/terminal-pane/pty-transport-types.ts
@@ -63,6 +63,8 @@ export type PtyConnectResult = {
   coldRestore?: { scrollback: string; cwd: string; cols?: number; rows?: number }
   replay?: string
   startupCwdFallback?: { kind: 'worktree'; cwd: string }
+  /** Main declined an unverifiable provider-session resume and launched fresh. */
+  agentResumeUnavailable?: true
   /** Trailing partial escape the daemon emulator held mid-parse; the reattach
    *  replay writes it LAST (after the reset) so a racing live continuation
    *  completes it instead of rendering literally (#7329). */
diff --git a/src/renderer/src/components/terminal-pane/pty-transport.test.ts b/src/renderer/src/components/terminal-pane/pty-transport.test.ts
index 80bf875ccb5..a0bc22e229c 100644
--- a/src/renderer/src/components/terminal-pane/pty-transport.test.ts
+++ b/src/renderer/src/components/terminal-pane/pty-transport.test.ts
@@ -480,6 +480,30 @@ describe('createIpcPtyTransport', () => {
     transport.disconnect()
   })
 
+  it('forwards the declined-resume signal on fresh and cold-restore spawns alike', async () => {
+    const { createIpcPtyTransport } = await import('./pty-transport')
+    const spawn = window.api.pty.spawn as unknown as ReturnType<typeof vi.fn>
+    spawn.mockResolvedValueOnce({ id: 'pty-1', agentResumeUnavailable: true })
+
+    const freshTransport = createIpcPtyTransport({})
+    await expect(freshTransport.connect({ url: '', callbacks: {} })).resolves.toEqual({
+      id: 'pty-1',
+      agentResumeUnavailable: true
+    })
+    freshTransport.disconnect()
+
+    spawn.mockResolvedValueOnce({
+      id: 'pty-2',
+      coldRestore: { scrollback: 'recovered', cwd: '/repo/app' },
+      agentResumeUnavailable: true
+    })
+    const coldTransport = createIpcPtyTransport({})
+    await expect(coldTransport.connect({ url: '', callbacks: {} })).resolves.toEqual(
+      expect.objectContaining({ id: 'pty-2', agentResumeUnavailable: true })
+    )
+    coldTransport.disconnect()
+  })
+
   it('defers title side effects until after terminal data is delivered', async () => {
     const { createIpcPtyTransport } = await import('./pty-transport')
     const onTitleChange = vi.fn()
diff --git a/src/renderer/src/components/terminal-pane/pty-transport.ts b/src/renderer/src/components/terminal-pane/pty-transport.ts
index 2fded96d677..1e3054f7050 100644
--- a/src/renderer/src/components/terminal-pane/pty-transport.ts
+++ b/src/renderer/src/components/terminal-pane/pty-transport.ts
@@ -804,17 +804,26 @@ export function createIpcPtyTransport(opts: IpcPtyTransportOptions = {}): PtyTra
             sessionExpired: spawnResult.sessionExpired,
             coldRestore: spawnResult.coldRestore,
             replay: spawnResult.replay,
-            pendingEscapeTailAnsi: spawnResult.pendingEscapeTailAnsi
+            pendingEscapeTailAnsi: spawnResult.pendingEscapeTailAnsi,
+            // Why: the cold-restore path re-runs the launch command, so it needs the
+            // same "main declined the resume" signal the fresh-spawn path gets.
+            ...(spawnResult.agentResumeUnavailable ? { agentResumeUnavailable: true as const } : {})
           } satisfies PtyConnectResult
         }
-        if (resultLaunchAgent || spawnResult.launchConfig || spawnResult.startupCwdFallback) {
+        if (
+          resultLaunchAgent ||
+          spawnResult.launchConfig ||
+          spawnResult.startupCwdFallback ||
+          spawnResult.agentResumeUnavailable
+        ) {
           return {
             id: spawnResult.id,
             ...(resultLaunchAgent ? { launchAgent: resultLaunchAgent } : {}),
             ...(spawnResult.launchConfig ? { launchConfig: spawnResult.launchConfig } : {}),
             ...(spawnResult.startupCwdFallback
               ? { startupCwdFallback: spawnResult.startupCwdFallback }
-              : {})
+              : {}),
+            ...(spawnResult.agentResumeUnavailable ? { agentResumeUnavailable: true as const } : {})
           } satisfies PtyConnectResult
         }
         return spawnResult.id
diff --git a/src/renderer/src/components/terminal-pane/session-restored-banner-pane-state.test.tsx b/src/renderer/src/components/terminal-pane/session-restored-banner-pane-state.test.tsx
index da560dc16fb..880bbd2c098 100644
--- a/src/renderer/src/components/terminal-pane/session-restored-banner-pane-state.test.tsx
+++ b/src/renderer/src/components/terminal-pane/session-restored-banner-pane-state.test.tsx
@@ -3,7 +3,10 @@
 import { act } from 'react'
 import { createRoot, type Root } from 'react-dom/client'
 import { afterEach, describe, expect, it } from 'vitest'
-import { SESSION_RESTORED_BANNER_TEXT } from './SessionRestoredBanner'
+import {
+  SESSION_RESTORED_BANNER_TEXT,
+  SESSION_RESUME_UNAVAILABLE_BANNER_TEXT
+} from './SessionRestoredBanner'
 import { SessionRestoredBannerPortals } from './SessionRestoredBannerPortals'
 import {
   addSessionRestoredBannerPaneId,
@@ -12,7 +15,8 @@ import {
   removeSessionRestoredBannerPaneId,
   seedStartupSessionRestoredBanner,
   syncSessionRestoredBannerTitleSpace,
-  type SessionRestoredBannerPane
+  type SessionRestoredBannerPane,
+  type SessionRestoredBannerPaneReasons
 } from './session-restored-banner-pane-state'
 
 const mountedRoots: Root[] = []
@@ -27,7 +31,7 @@ function createPane(id: number): SessionRestoredBannerPane {
 
 async function renderPortals(
   panes: readonly SessionRestoredBannerPane[],
-  paneIds: ReadonlySet<number>
+  paneIds: SessionRestoredBannerPaneReasons
 ): Promise<void> {
   const rootContainer = document.createElement('div')
   document.body.appendChild(rootContainer)
@@ -43,6 +47,10 @@ function eventFrom(target: HTMLElement, event: KeyboardEvent | PointerEvent): ty
   return event
 }
 
+function bannerReasons(paneIds: readonly number[]): SessionRestoredBannerPaneReasons {
+  return new Map(paneIds.map((paneId) => [paneId, 'restored' as const]))
+}
+
 function paneText(pane: SessionRestoredBannerPane): string {
   return pane.container.textContent ?? ''
 }
@@ -60,7 +68,7 @@ describe('session restored banner pane state', () => {
   it('seeds sidebar startup onto the created pane and renders its overlay there', async () => {
     const firstPane = createPane(1)
     const createdPane = createPane(2)
-    let paneIds = new Set<number>()
+    let paneIds: SessionRestoredBannerPaneReasons = new Map()
 
     seedStartupSessionRestoredBanner(
       { showSessionRestoredBanner: true },
@@ -71,7 +79,7 @@ describe('session restored banner pane state', () => {
     )
     await renderPortals([firstPane, createdPane], paneIds)
 
-    expect(paneIds).toEqual(new Set([createdPane.id]))
+    expect(paneIds).toEqual(new Map([[createdPane.id, 'restored']]))
     expect(paneText(firstPane)).toBe('')
     expect(paneText(createdPane)).toBe(SESSION_RESTORED_BANNER_TEXT)
   })
@@ -84,7 +92,7 @@ describe('session restored banner pane state', () => {
       panes: [activePane, secondPane],
       paneTitles: {},
       renamingPaneId: null,
-      sessionRestoredBannerPaneIds: new Set()
+      sessionRestoredBannerPaneIds: new Map()
     })
 
     expect(needsFit).toBe(false)
@@ -100,7 +108,7 @@ describe('session restored banner pane state', () => {
       panes: [titledPane, renamingPane],
       paneTitles: { [titledPane.id]: 'server' },
       renamingPaneId: renamingPane.id,
-      sessionRestoredBannerPaneIds: new Set()
+      sessionRestoredBannerPaneIds: new Map()
     })
 
     expect(needsFit).toBe(true)
@@ -111,7 +119,7 @@ describe('session restored banner pane state', () => {
   it('renders and reserves title space only on the restored inactive split pane', async () => {
     const activePane = createPane(1)
     const inactiveRestoredPane = createPane(2)
-    const paneIds = new Set([inactiveRestoredPane.id])
+    const paneIds = new Map<number, 'restored'>([[inactiveRestoredPane.id, 'restored']])
 
     const needsFit = syncSessionRestoredBannerTitleSpace({
       panes: [activePane, inactiveRestoredPane],
@@ -128,6 +136,22 @@ describe('session restored banner pane state', () => {
     expect(paneText(inactiveRestoredPane)).toBe(SESSION_RESTORED_BANNER_TEXT)
   })
 
+  it('names a fresh session when the requested resume could not be verified', async () => {
+    const restoredPane = createPane(1)
+    const freshPane = createPane(2)
+
+    await renderPortals(
+      [restoredPane, freshPane],
+      new Map([
+        [restoredPane.id, 'restored' as const],
+        [freshPane.id, 'resume-unavailable' as const]
+      ])
+    )
+
+    expect(paneText(restoredPane)).toBe(SESSION_RESTORED_BANNER_TEXT)
+    expect(paneText(freshPane)).toBe(SESSION_RESUME_UNAVAILABLE_BANNER_TEXT)
+  })
+
   it('dismisses only the interacted pane for pointer and key events', () => {
     const firstPane = createPane(1)
     const secondPane = createPane(2)
@@ -137,18 +161,18 @@ describe('session restored banner pane state', () => {
     secondPane.container.appendChild(secondChild)
 
     const afterPointer = dismissSessionRestoredBannerPaneIds(
-      new Set([firstPane.id, secondPane.id]),
+      bannerReasons([firstPane.id, secondPane.id]),
       eventFrom(secondChild, new PointerEvent('pointerdown', { bubbles: true })),
       [firstPane, secondPane]
     )
     const afterKey = dismissSessionRestoredBannerPaneIds(
-      new Set([firstPane.id, secondPane.id]),
+      bannerReasons([firstPane.id, secondPane.id]),
       eventFrom(firstChild, new KeyboardEvent('keydown', { bubbles: true })),
       [firstPane, secondPane]
     )
 
-    expect(afterPointer).toEqual(new Set([firstPane.id]))
-    expect(afterKey).toEqual(new Set([secondPane.id]))
+    expect(afterPointer).toEqual(bannerReasons([firstPane.id]))
+    expect(afterKey).toEqual(bannerReasons([secondPane.id]))
   })
 
   it('clears all restored banners when dismissal cannot resolve a pane', () => {
@@ -158,23 +182,23 @@ describe('session restored banner pane state', () => {
     document.body.appendChild(outside)
 
     const afterDismiss = dismissSessionRestoredBannerPaneIds(
-      new Set([firstPane.id, secondPane.id]),
+      bannerReasons([firstPane.id, secondPane.id]),
       eventFrom(outside, new PointerEvent('pointerdown', { bubbles: true })),
       [firstPane, secondPane]
     )
 
-    expect(afterDismiss).toEqual(new Set())
+    expect(afterDismiss).toEqual(new Map())
   })
 
   it('clears banners for closed or removed panes', () => {
     const firstPane = createPane(1)
     const secondPane = createPane(2)
 
-    expect(removeSessionRestoredBannerPaneId(new Set([firstPane.id, secondPane.id]), 2)).toEqual(
-      new Set([firstPane.id])
-    )
     expect(
-      pruneSessionRestoredBannerPaneIds(new Set([firstPane.id, secondPane.id]), [firstPane])
-    ).toEqual(new Set([firstPane.id]))
+      removeSessionRestoredBannerPaneId(bannerReasons([firstPane.id, secondPane.id]), 2)
+    ).toEqual(bannerReasons([firstPane.id]))
+    expect(
+      pruneSessionRestoredBannerPaneIds(bannerReasons([firstPane.id, secondPane.id]), [firstPane])
+    ).toEqual(bannerReasons([firstPane.id]))
   })
 })
diff --git a/src/renderer/src/components/terminal-pane/session-restored-banner-pane-state.ts b/src/renderer/src/components/terminal-pane/session-restored-banner-pane-state.ts
index 03fd87ad600..64d2dbfd9fb 100644
--- a/src/renderer/src/components/terminal-pane/session-restored-banner-pane-state.ts
+++ b/src/renderer/src/components/terminal-pane/session-restored-banner-pane-state.ts
@@ -2,6 +2,12 @@ import type { ManagedPane } from '@/lib/pane-manager/pane-manager'
 
 export type SessionRestoredBannerPane = Pick<ManagedPane, 'id' | 'container'>
 
+/** `resume-unavailable`: the pane asked to resume a provider session Orca could not
+ *  verify, so it launched a fresh one — silence would read as a successful restore. */
+export type SessionRestoredBannerReason = 'restored' | 'resume-unavailable'
+
+export type SessionRestoredBannerPaneReasons = ReadonlyMap<number, SessionRestoredBannerReason>
+
 export type SessionRestoredBannerStartup =
   | {
       showSessionRestoredBanner?: boolean
@@ -12,36 +18,37 @@ export type SessionRestoredBannerStartup =
 export type SessionRestoredBannerDismissEvent = KeyboardEvent | PointerEvent
 
 export function addSessionRestoredBannerPaneId(
-  paneIds: ReadonlySet<number>,
-  paneId: number
-): Set<number> {
-  if (paneIds.has(paneId)) {
-    return paneIds instanceof Set ? paneIds : new Set(paneIds)
+  paneReasons: SessionRestoredBannerPaneReasons,
+  paneId: number,
+  reason: SessionRestoredBannerReason = 'restored'
+): Map<number, SessionRestoredBannerReason> {
+  if (paneReasons.get(paneId) === reason) {
+    return paneReasons instanceof Map ? paneReasons : new Map(paneReasons)
   }
-  return new Set(paneIds).add(paneId)
+  return new Map(paneReasons).set(paneId, reason)
 }
 
 export function removeSessionRestoredBannerPaneId(
-  paneIds: ReadonlySet<number>,
+  paneReasons: SessionRestoredBannerPaneReasons,
   paneId: number
-): Set<number> {
-  if (!paneIds.has(paneId)) {
-    return paneIds instanceof Set ? paneIds : new Set(paneIds)
+): Map<number, SessionRestoredBannerReason> {
+  if (!paneReasons.has(paneId)) {
+    return paneReasons instanceof Map ? paneReasons : new Map(paneReasons)
   }
-  const next = new Set(paneIds)
+  const next = new Map(paneReasons)
   next.delete(paneId)
   return next
 }
 
 export function pruneSessionRestoredBannerPaneIds(
-  paneIds: ReadonlySet<number>,
+  paneReasons: SessionRestoredBannerPaneReasons,
   panes: readonly SessionRestoredBannerPane[]
-): Set<number> {
+): Map<number, SessionRestoredBannerReason> {
   const livePaneIds = new Set(panes.map((pane) => pane.id))
-  if ([...paneIds].every((paneId) => livePaneIds.has(paneId))) {
-    return paneIds instanceof Set ? paneIds : new Set(paneIds)
+  if ([...paneReasons.keys()].every((paneId) => livePaneIds.has(paneId))) {
+    return paneReasons instanceof Map ? paneReasons : new Map(paneReasons)
   }
-  return new Set([...paneIds].filter((paneId) => livePaneIds.has(paneId)))
+  return new Map([...paneReasons].filter(([paneId]) => livePaneIds.has(paneId)))
 }
 
 export function getSessionRestoredBannerDismissPaneId(
@@ -62,21 +69,21 @@ export function getSessionRestoredBannerDismissPaneId(
 }
 
 export function dismissSessionRestoredBannerPaneIds(
-  paneIds: ReadonlySet<number>,
+  paneReasons: SessionRestoredBannerPaneReasons,
   event: SessionRestoredBannerDismissEvent,
   panes: readonly SessionRestoredBannerPane[]
-): Set<number> {
+): Map<number, SessionRestoredBannerReason> {
   const paneId = getSessionRestoredBannerDismissPaneId(event, panes)
   if (paneId === null) {
-    return new Set()
+    return new Map()
   }
-  return removeSessionRestoredBannerPaneId(paneIds, paneId)
+  return removeSessionRestoredBannerPaneId(paneReasons, paneId)
 }
 
 export function seedStartupSessionRestoredBanner(
   startup: SessionRestoredBannerStartup,
   paneId: number,
-  onShowSessionRestoredBanner: (paneId: number) => void
+  onShowSessionRestoredBanner: (paneId: number, reason?: SessionRestoredBannerReason) => void
 ): void {
   if (startup?.showSessionRestoredBanner === true) {
     onShowSessionRestoredBanner(paneId)
@@ -87,7 +94,7 @@ export function syncSessionRestoredBannerTitleSpace(args: {
   panes: readonly SessionRestoredBannerPane[]
   paneTitles: Readonly<Record<number, string>>
   renamingPaneId: number | null
-  sessionRestoredBannerPaneIds: ReadonlySet<number>
+  sessionRestoredBannerPaneIds: SessionRestoredBannerPaneReasons
 }): boolean {
   let needsFit = false
   for (const pane of args.panes) {
diff --git a/src/renderer/src/components/terminal-pane/use-terminal-pane-lifecycle.ts b/src/renderer/src/components/terminal-pane/use-terminal-pane-lifecycle.ts
index 7650e870b09..dd1710dd3d2 100644
--- a/src/renderer/src/components/terminal-pane/use-terminal-pane-lifecycle.ts
+++ b/src/renderer/src/components/terminal-pane/use-terminal-pane-lifecycle.ts
@@ -131,7 +131,10 @@ import {
 import { acquireWebviewsDragPassthrough } from '../browser-pane/webview-registry'
 import { recordCreatedTerminalPaneSplit } from './terminal-pane-split-completion'
 import { closeTerminalTab } from '../terminal/terminal-tab-actions'
-import { seedStartupSessionRestoredBanner } from './session-restored-banner-pane-state'
+import {
+  seedStartupSessionRestoredBanner,
+  type SessionRestoredBannerReason
+} from './session-restored-banner-pane-state'
 import {
   resolveTabTitleAfterPaneClose,
   shouldClearLaunchAgentForClosedPane
@@ -281,7 +284,7 @@ type UseTerminalPaneLifecycleDeps = {
   clearWorktreeUnread: (worktreeId: string) => void
   clearTerminalTabUnread: (tabId: string) => void
   clearTerminalPaneUnread: (paneKey: string) => void
-  onShowSessionRestoredBanner: (paneId: number) => void
+  onShowSessionRestoredBanner: (paneId: number, reason?: SessionRestoredBannerReason) => void
   dispatchNotification: (event: {
     source: 'terminal-bell' | 'agent-task-complete'
     terminalTitle?: string
diff --git a/src/shared/agent-resume-argv-drop.test.ts b/src/shared/agent-resume-argv-drop.test.ts
new file mode 100644
index 00000000000..4dc71f4932e
--- /dev/null
+++ b/src/shared/agent-resume-argv-drop.test.ts
@@ -0,0 +1,109 @@
+import { describe, expect, it } from 'vitest'
+import { dropAgentResumeArgvFromCommand } from './agent-resume-argv-drop'
+import { buildAgentResumeStartupPlan } from './tui-agent-startup'
+
+const CODEX_SESSION = {
+  key: 'session_id' as const,
+  id: '0199aa11-2b3c-4d5e-8f90-a1b2c3d4e5f6'
+}
+
+function planFor(platform: NodeJS.Platform, agentArgs?: string): string {
+  const plan = buildAgentResumeStartupPlan({
+    agent: 'codex',
+    providerSession: CODEX_SESSION,
+    cmdOverrides: {},
+    platform,
+    ...(agentArgs ? { agentArgs } : {})
+  })
+  if (!plan) {
+    throw new Error('expected a codex resume plan')
+  }
+  return plan.launchCommand
+}
+
+describe('dropAgentResumeArgvFromCommand', () => {
+  it('drops the resume argv the shared builder appended on every platform', () => {
+    for (const platform of ['darwin', 'linux', 'win32'] as const) {
+      const command = planFor(platform)
+      expect(command).toContain(CODEX_SESSION.id)
+      expect(
+        dropAgentResumeArgvFromCommand({
+          command,
+          agent: 'codex',
+          providerSession: CODEX_SESSION
+        })
+      ).toEqual({ status: 'dropped', command: 'codex' })
+    }
+  })
+
+  it('keeps the user CLI args that precede the resume argv', () => {
+    expect(
+      dropAgentResumeArgvFromCommand({
+        command: planFor('darwin', '--search'),
+        agent: 'codex',
+        providerSession: CODEX_SESSION
+      })
+    ).toEqual({ status: 'dropped', command: "codex '--search'" })
+  })
+
+  it('drops an unquoted resume argv from a legacy persisted command', () => {
+    expect(
+      dropAgentResumeArgvFromCommand({
+        command: `codex resume ${CODEX_SESSION.id}`,
+        agent: 'codex',
+        providerSession: CODEX_SESSION
+      })
+    ).toEqual({ status: 'dropped', command: 'codex' })
+  })
+
+  it('reports absent when the command never carried the resume locator', () => {
+    expect(
+      dropAgentResumeArgvFromCommand({
+        command: 'codex --search',
+        agent: 'codex',
+        providerSession: CODEX_SESSION
+      })
+    ).toEqual({ status: 'absent' })
+  })
+
+  it('refuses a command whose locator is not the trailing argv', () => {
+    // Why: the caller must fail the spawn rather than launch a resume it could not cancel.
+    expect(
+      dropAgentResumeArgvFromCommand({
+        command: `codex resume ${CODEX_SESSION.id} --search`,
+        agent: 'codex',
+        providerSession: CODEX_SESSION
+      })
+    ).toEqual({ status: 'unrecognized' })
+  })
+
+  it('requires a whitespace boundary so a longer subcommand cannot match', () => {
+    expect(
+      dropAgentResumeArgvFromCommand({
+        command: `codex xresume ${CODEX_SESSION.id}`,
+        agent: 'codex',
+        providerSession: CODEX_SESSION
+      })
+    ).toEqual({ status: 'unrecognized' })
+  })
+
+  it('does not strip a bare resume argv with no launch command in front of it', () => {
+    expect(
+      dropAgentResumeArgvFromCommand({
+        command: `resume ${CODEX_SESSION.id}`,
+        agent: 'codex',
+        providerSession: CODEX_SESSION
+      })
+    ).toEqual({ status: 'unrecognized' })
+  })
+
+  it('drops the resume argv for the other resumable agents too', () => {
+    expect(
+      dropAgentResumeArgvFromCommand({
+        command: `claude '--resume' '${CODEX_SESSION.id}'`,
+        agent: 'claude',
+        providerSession: CODEX_SESSION
+      })
+    ).toEqual({ status: 'dropped', command: 'claude' })
+  })
+})
diff --git a/src/shared/agent-resume-argv-drop.ts b/src/shared/agent-resume-argv-drop.ts
new file mode 100644
index 00000000000..03646e83812
--- /dev/null
+++ b/src/shared/agent-resume-argv-drop.ts
@@ -0,0 +1,61 @@
+import {
+  getAgentResumeArgv,
+  type AgentProviderSessionMetadata,
+  type ResumableTuiAgent
+} from './agent-session-resume'
+import { quoteStartupArg, type AgentStartupShell } from './tui-agent-startup-shell'
+
+/** `dropped` carries the plain launch command; `unrecognized` means the resume
+ *  locator is still in there and the caller must refuse the launch rather than
+ *  run a resume it could not cancel. */
+export type AgentResumeArgvDrop =
+  | { status: 'dropped'; command: string }
+  | { status: 'absent' }
+  | { status: 'unrecognized' }
+
+const RESUME_ARGV_SHELLS: readonly AgentStartupShell[] = ['posix', 'powershell', 'cmd']
+
+function resumeArgvSuffixCandidates(resumeArgs: readonly string[]): string[] {
+  const candidates = new Set<string>([resumeArgs.join(' ')])
+  for (const shell of RESUME_ARGV_SHELLS) {
+    candidates.add(resumeArgs.map((arg) => quoteStartupArg(arg, shell)).join(' '))
+  }
+  return [...candidates]
+}
+
+function stripSuffix(command: string, suffix: string): string | null {
+  const base = command.slice(0, command.length - suffix.length)
+  // Why: require a whitespace boundary so `codex resume-foo` can't match `resume`.
+  if (!command.endsWith(suffix) || base.length === 0 || !/\s$/.test(base)) {
+    return null
+  }
+  const trimmed = base.trimEnd()
+  return trimmed.length > 0 ? trimmed : null
+}
+
+/**
+ * Remove the resume argv `buildAgentResumeStartupPlan` appended, leaving the plain
+ * agent launch. Main uses this when it cannot verify which account owns the session,
+ * so the pane starts fresh instead of resuming under whichever account is selected.
+ */
+export function dropAgentResumeArgvFromCommand(args: {
+  command: string
+  agent: ResumableTuiAgent
+  providerSession: AgentProviderSessionMetadata
+  ompResumeFilePath?: string | null
+}): AgentResumeArgvDrop {
+  const argv = getAgentResumeArgv(args.agent, args.providerSession, args.ompResumeFilePath)
+  const resumeArgs = argv?.slice(1) ?? []
+  const locator = resumeArgs.at(-1)
+  const command = args.command.trimEnd()
+  if (!locator || !command.includes(locator)) {
+    return { status: 'absent' }
+  }
+  for (const suffix of resumeArgvSuffixCandidates(resumeArgs)) {
+    const base = stripSuffix(command, suffix)
+    if (base !== null && !base.includes(locator)) {
+      return { status: 'dropped', command: base }
+    }
+  }
+  return { status: 'unrecognized' }
+}