diff --git a/frontend/src/api/opencode.test.ts b/frontend/src/api/opencode.test.ts
index 87bb967c4..53026b53c 100644
--- a/frontend/src/api/opencode.test.ts
+++ b/frontend/src/api/opencode.test.ts
@@ -392,6 +392,21 @@ describe('OpenCode facade', () => {
     expect((failure as FetchError).message).toBe('Session not found')
   })
 
+  it('preserves the declared error tag as FetchError.code', async () => {
+    fetchMock.mockResolvedValue(
+      new Response(
+        JSON.stringify({ _tag: 'PermissionNotFoundError', sessionID: 'ses_1', requestID: 'per_1', message: 'Permission request not found' }),
+        { status: 404, headers: { 'Content-Type': 'application/json' } },
+      ),
+    )
+
+    const failure = await replyPermission('ses_1', 'per_1', 'once').catch((error: unknown) => error)
+
+    expect(failure).toBeInstanceOf(FetchError)
+    expect((failure as FetchError).statusCode).toBe(404)
+    expect((failure as FetchError).code).toBe('PermissionNotFoundError')
+  })
+
   it('maps a declared V2 conflict error to 409', async () => {
     fetchMock.mockResolvedValue(
       new Response(
diff --git a/frontend/src/components/repo/WorktreeSessionGroups.tsx b/frontend/src/components/repo/WorktreeSessionGroups.tsx
index caf97543d..6617639a3 100644
--- a/frontend/src/components/repo/WorktreeSessionGroups.tsx
+++ b/frontend/src/components/repo/WorktreeSessionGroups.tsx
@@ -179,7 +179,7 @@ export function WorktreeSessionGroups({
               <div className="flex min-w-0 items-center gap-2">
                 <span className="truncate text-sm font-medium">{label}</span>
                 {sourceLabel && source && (
-                  <span className={`shrink-0 rounded border px-1.5 text-[10px] leading-4 ${OWNER_BADGE_CLASS[source]}`}>{sourceLabel}</span>
+                  <span className={`shrink-0 rounded-none border px-1.5 text-[10px] leading-4 ${OWNER_BADGE_CLASS[source]}`}>{sourceLabel}</span>
                 )}
                 {isInUse && (
                   <span className="inline-flex shrink-0 items-center gap-1 rounded-full border border-success/40 bg-success/15 px-1.5 text-[10px] leading-4 text-success">
diff --git a/frontend/src/contexts/EventContext.test.tsx b/frontend/src/contexts/EventContext.test.tsx
index ad99aca99..b0f775970 100644
--- a/frontend/src/contexts/EventContext.test.tsx
+++ b/frontend/src/contexts/EventContext.test.tsx
@@ -1,10 +1,12 @@
 import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
 import { act, render, screen, waitFor } from '@testing-library/react'
 import userEvent from '@testing-library/user-event'
-import type { ReactNode } from 'react'
+import { useState, type ReactNode } from 'react'
 import { MemoryRouter, useLocation } from 'react-router-dom'
 import { beforeEach, describe, expect, it, vi } from 'vitest'
 import type { FormInfo, PermissionRequest } from '@opencode-manager/shared/opencode'
+import { FetchError } from '@opencode-manager/shared'
+import { showToast } from '@/lib/toast'
 import { useSessionStatus } from '@/stores/sessionStatusStore'
 import { changeWalkthroughQueryKey } from '@/hooks/useChangeWalkthrough'
 import { EventProvider, useEventContext, useForms, usePermissions, useSSEHealth } from './EventContext'
@@ -95,9 +97,14 @@ function Harness() {
   const { current, pendingCount, syncForSession, navigateToCurrent, cancel, reply, getForSession } = useForms()
   const permissions = usePermissions()
   const location = useLocation()
+  const [rejection, setRejection] = useState('none')
+  const recordRejection = (action: Promise<void>) => {
+    action.catch((error: unknown) => setRejection(error instanceof FetchError ? error.code ?? 'unknown' : 'unknown'))
+  }
 
   return (
     <div>
+      <div data-testid="rejection">{rejection}</div>
       <div data-testid="count">{pendingCount}</div>
       <div data-testid="current">{current?.id ?? 'none'}</div>
       <div data-testid="for-session-1">{getForSession('session-1')?.id ?? 'none'}</div>
@@ -116,9 +123,9 @@ function Harness() {
       <button onClick={() => syncForSession('/repo', 'session-1')}>Sync</button>
       <button onClick={() => permissions.syncForSession('/repo', 'session-1')}>Sync Permissions</button>
       <button onClick={navigateToCurrent}>Navigate</button>
-      <button onClick={() => current && cancel(current.id)}>Dismiss</button>
-      <button onClick={() => current && reply(current.id, { q0: 'Yes' })}>Reply</button>
-      <button onClick={() => permissions.current && permissions.respond(permissions.current.id, permissions.current.sessionID, 'reject')}>Reject Permission</button>
+      <button onClick={() => current && recordRejection(cancel(current.id))}>Dismiss</button>
+      <button onClick={() => current && recordRejection(reply(current.id, { q0: 'Yes' }))}>Reply</button>
+      <button onClick={() => permissions.current && recordRejection(permissions.respond(permissions.current.id, permissions.current.sessionID, 'reject'))}>Reject Permission</button>
       <button onClick={() => permissions.current && permissions.respond(permissions.current.id, permissions.current.sessionID, 'reject', 'not allowed')}>Reject Permission With Reason</button>
     </div>
   )
@@ -248,6 +255,88 @@ describe('EventProvider permissions and forms', () => {
     })
   })
 
+  it('removes a permission the server no longer knows about when replying', async () => {
+    mocks.listPendingPermissions.mockResolvedValue([pendingPermission])
+    mocks.replyPermission.mockRejectedValue(new FetchError('Permission request not found', 404, 'PermissionNotFoundError'))
+
+    render(<Harness />, { wrapper: createWrapper() })
+
+    await userEvent.click(screen.getByRole('button', { name: 'Sync Permissions' }))
+
+    await waitFor(() => expect(screen.getByTestId('permission-count')).toHaveTextContent('1'))
+
+    await userEvent.click(screen.getByRole('button', { name: 'Reject Permission' }))
+
+    await waitFor(() => {
+      expect(screen.getByTestId('permission-count')).toHaveTextContent('0')
+      expect(screen.getByTestId('permission-current')).toHaveTextContent('none')
+    })
+    expect(showToast.info).toHaveBeenCalledWith('Permission request expired')
+    expect(screen.getByTestId('rejection')).toHaveTextContent('none')
+  })
+
+  it('keeps a permission and rejects when the reply fails for another reason', async () => {
+    mocks.listPendingPermissions.mockResolvedValue([pendingPermission])
+    mocks.replyPermission.mockRejectedValue(new FetchError('Session not found', 404, 'SessionNotFoundError'))
+
+    render(<Harness />, { wrapper: createWrapper() })
+
+    await userEvent.click(screen.getByRole('button', { name: 'Sync Permissions' }))
+
+    await waitFor(() => expect(screen.getByTestId('permission-count')).toHaveTextContent('1'))
+
+    await userEvent.click(screen.getByRole('button', { name: 'Reject Permission' }))
+
+    await waitFor(() => expect(screen.getByTestId('rejection')).toHaveTextContent('SessionNotFoundError'))
+    expect(screen.getByTestId('permission-count')).toHaveTextContent('1')
+    expect(screen.getByTestId('permission-current')).toHaveTextContent('permission-1')
+    expect(showToast.info).not.toHaveBeenCalled()
+  })
+
+  it.each([
+    ['Reply', 'replyForm'],
+    ['Dismiss', 'cancelForm'],
+  ] as const)('removes a form the server no longer knows about on %s', async (button, mock) => {
+    mocks.listPendingForms.mockResolvedValue([pendingForm])
+    mocks[mock].mockRejectedValue(new FetchError('Form not found', 404, 'FormNotFoundError'))
+
+    render(<Harness />, { wrapper: createWrapper() })
+
+    await userEvent.click(screen.getByRole('button', { name: 'Sync' }))
+
+    await waitFor(() => expect(screen.getByTestId('count')).toHaveTextContent('1'))
+
+    await userEvent.click(screen.getByRole('button', { name: button }))
+
+    await waitFor(() => {
+      expect(screen.getByTestId('count')).toHaveTextContent('0')
+      expect(screen.getByTestId('current')).toHaveTextContent('none')
+    })
+    expect(showToast.info).toHaveBeenCalledWith('Form expired')
+    expect(screen.getByTestId('rejection')).toHaveTextContent('none')
+  })
+
+  it.each([
+    ['Reply', 'replyForm'],
+    ['Dismiss', 'cancelForm'],
+  ] as const)('keeps a form and rejects when %s fails for another reason', async (button, mock) => {
+    mocks.listPendingForms.mockResolvedValue([pendingForm])
+    mocks[mock].mockRejectedValue(new FetchError('Form already settled', 409, 'FormAlreadySettledError'))
+
+    render(<Harness />, { wrapper: createWrapper() })
+
+    await userEvent.click(screen.getByRole('button', { name: 'Sync' }))
+
+    await waitFor(() => expect(screen.getByTestId('count')).toHaveTextContent('1'))
+
+    await userEvent.click(screen.getByRole('button', { name: button }))
+
+    await waitFor(() => expect(screen.getByTestId('rejection')).toHaveTextContent('FormAlreadySettledError'))
+    expect(screen.getByTestId('count')).toHaveTextContent('1')
+    expect(screen.getByTestId('current')).toHaveTextContent('form-1')
+    expect(showToast.info).not.toHaveBeenCalled()
+  })
+
   it('forwards an optional rejection message to the facade', async () => {
     mocks.listPendingPermissions.mockResolvedValue([pendingPermission])
 
diff --git a/frontend/src/contexts/EventContext.tsx b/frontend/src/contexts/EventContext.tsx
index 926a6d850..bcef20aa2 100644
--- a/frontend/src/contexts/EventContext.tsx
+++ b/frontend/src/contexts/EventContext.tsx
@@ -11,6 +11,7 @@ import {
   replyPermission,
 } from '@/api/opencode'
 import { listRepos } from '@/api/repos'
+import { FetchError } from '@opencode-manager/shared'
 import type { FormAnswer, FormInfo, PermissionRequest, V2Event } from '@opencode-manager/shared/opencode'
 import type { PermissionResponse, SSHHostKeyRequest, Repo } from '@/api/types'
 import { showToast } from '@/lib/toast'
@@ -94,6 +95,11 @@ interface EventContextValue {
   permissions: {
     current: PermissionRequest | null
     pendingCount: number
+    /**
+     * Replies to a permission request and removes it from the queue. Resolves, after showing an
+     * "expired" toast, when the server no longer knows the request (`PermissionNotFoundError`);
+     * rejects on any other failure and keeps the request queued.
+     */
     respond: (
       permissionID: string,
       sessionID: string,
@@ -111,7 +117,15 @@ interface EventContextValue {
   forms: {
     current: FormInfo | null
     pendingCount: number
+    /**
+     * Answers a form and removes it from the queue. Resolves, after showing an "expired" toast,
+     * when the server no longer knows the form (`FormNotFoundError`); rejects on any other failure.
+     */
     reply: (formID: string, answer: FormAnswer) => Promise<void>
+    /**
+     * Dismisses a form on the server and removes it from the queue, with the same
+     * resolve-on-`FormNotFoundError` contract as `reply`.
+     */
     cancel: (formID: string) => Promise<void>
     dismiss: (formID: string, sessionID?: string) => void
     getForSession: (sessionID: string) => FormInfo | null
@@ -123,6 +137,24 @@ interface EventContextValue {
   getRepoIdForSession: (sessionID: string) => number | null
 }
 
+/**
+ * Sends a reply to a pending server request and treats the request as settled when the server
+ * reports it no longer exists (`goneCode`), showing `expiredMessage` instead of rejecting.
+ * Every other failure is rethrown.
+ */
+async function settlePendingReply(
+  reply: () => Promise<void>,
+  goneCode: string,
+  expiredMessage: string,
+): Promise<void> {
+  try {
+    await reply()
+  } catch (error) {
+    if (!(error instanceof FetchError && error.code === goneCode)) throw error
+    showToast.info(expiredMessage)
+  }
+}
+
 const EventContext = createContext<EventContextValue | null>(null)
 
 export function EventProvider({ children }: { children: React.ReactNode }) {
@@ -284,21 +316,25 @@ export function EventProvider({ children }: { children: React.ReactNode }) {
     response: PermissionResponse,
     message?: string,
   ) => {
-    await replyPermission(sessionID, permissionID, response, message)
+    await settlePendingReply(
+      () => replyPermission(sessionID, permissionID, response, message),
+      'PermissionNotFoundError',
+      'Permission request expired',
+    )
     removePermission(permissionID, sessionID)
   }, [removePermission])
 
   const replyToForm = useCallback(async (formID: string, answer: FormAnswer) => {
     const form = Object.values(formsBySession).flat().find(f => f.id === formID)
     if (!form) throw new Error('Form not found')
-    await replyForm(form.sessionID, formID, answer)
+    await settlePendingReply(() => replyForm(form.sessionID, formID, answer), 'FormNotFoundError', 'Form expired')
     removeForm(formID, form.sessionID)
   }, [formsBySession, removeForm])
 
   const cancelPendingForm = useCallback(async (formID: string) => {
     const form = Object.values(formsBySession).flat().find(f => f.id === formID)
     if (!form) throw new Error('Form not found')
-    await cancelForm(form.sessionID, formID)
+    await settlePendingReply(() => cancelForm(form.sessionID, formID), 'FormNotFoundError', 'Form expired')
     removeForm(formID, form.sessionID)
   }, [formsBySession, removeForm])