diff --git a/src/renderer/src/i18n/locales/en.json b/src/renderer/src/i18n/locales/en.json
index aeba47918b9..c948413aedf 100644
--- a/src/renderer/src/i18n/locales/en.json
+++ b/src/renderer/src/i18n/locales/en.json
@@ -18219,7 +18219,8 @@
         "reconnectTimeout": "The server did not reconnect on the updated version."
       },
       "webRuntimeSession": {
-        "remoteHostDisconnected": "The workspace is not connected to a remote Orca host."
+        "remoteHostDisconnected": "The workspace is not connected to a remote Orca host.",
+        "terminalCreateUnconfirmed": "Orca couldn’t confirm that the new terminal opened on the host."
       },
       "gitlabJobTraceClient": {
         "loadFailed": "Failed to load the GitLab job log.",
diff --git a/src/renderer/src/lib/launch-agent-in-new-tab-web-runtime.test.ts b/src/renderer/src/lib/launch-agent-in-new-tab-web-runtime.test.ts
index 903c7d51d13..024755a0d76 100644
--- a/src/renderer/src/lib/launch-agent-in-new-tab-web-runtime.test.ts
+++ b/src/renderer/src/lib/launch-agent-in-new-tab-web-runtime.test.ts
@@ -98,15 +98,18 @@ describe('launchAgentInNewTab paired web runtime', () => {
         pasteDraftAfterLaunch: false
       })
     )
-    expect(mocks.createWebRuntimeSessionTerminal).toHaveBeenCalledWith({
-      worktreeId: 'wt-1',
-      environmentId: 'web-runtime',
-      targetGroupId: 'group-1',
-      activate: true,
-      agentSessionKind: 'fresh',
-      agent: 'claude',
-      viewMode: 'terminal'
-    })
+    expect(mocks.createWebRuntimeSessionTerminal).toHaveBeenCalledWith(
+      {
+        worktreeId: 'wt-1',
+        environmentId: 'web-runtime',
+        targetGroupId: 'group-1',
+        activate: true,
+        agentSessionKind: 'fresh',
+        agent: 'claude',
+        viewMode: 'terminal'
+      },
+      { notifyFailure: false }
+    )
     expect(mocks.createTab).not.toHaveBeenCalled()
     await Promise.resolve()
     // Why: host creation is async, so the user may be viewing another worktree by the time it lands.
@@ -134,25 +137,28 @@ describe('launchAgentInNewTab paired web runtime', () => {
         pasteDraftAfterLaunch: false
       })
     )
-    expect(mocks.createWebRuntimeSessionTerminal).toHaveBeenCalledWith({
-      worktreeId: 'wt-1',
-      environmentId: 'web-runtime',
-      targetGroupId: 'group-1',
-      activate: true,
-      agentSessionKind: 'fresh',
-      launchAgent: 'codex',
-      command: "codex '--model' 'gpt-5' '--reasoning-effort' 'high' 'fix the spinner'",
-      env: { CODEX_PROFILE: 'captured' },
-      launchConfig: {
-        agentCommand: "codex '--model' 'gpt-5' '--reasoning-effort' 'high'",
-        agentArgs: '--model gpt-5 --reasoning-effort high',
-        agentEnv: { CODEX_PROFILE: 'captured' }
+    expect(mocks.createWebRuntimeSessionTerminal).toHaveBeenCalledWith(
+      {
+        worktreeId: 'wt-1',
+        environmentId: 'web-runtime',
+        targetGroupId: 'group-1',
+        activate: true,
+        agentSessionKind: 'fresh',
+        launchAgent: 'codex',
+        command: "codex '--model' 'gpt-5' '--reasoning-effort' 'high' 'fix the spinner'",
+        env: { CODEX_PROFILE: 'captured' },
+        launchConfig: {
+          agentCommand: "codex '--model' 'gpt-5' '--reasoning-effort' 'high'",
+          agentArgs: '--model gpt-5 --reasoning-effort high',
+          agentEnv: { CODEX_PROFILE: 'captured' }
+        },
+        startupCommandDelivery: 'shell-ready',
+        prompt: 'fix the spinner',
+        promptDelivery: 'auto-submit',
+        viewMode: 'terminal'
       },
-      startupCommandDelivery: 'shell-ready',
-      prompt: 'fix the spinner',
-      promptDelivery: 'auto-submit',
-      viewMode: 'terminal'
-    })
+      { notifyFailure: false }
+    )
     expect(mocks.createTab).not.toHaveBeenCalled()
   })
 })
diff --git a/src/renderer/src/lib/launch-agent-in-new-tab.test.ts b/src/renderer/src/lib/launch-agent-in-new-tab.test.ts
index 885be5b6ae8..3b7d4051ad0 100644
--- a/src/renderer/src/lib/launch-agent-in-new-tab.test.ts
+++ b/src/renderer/src/lib/launch-agent-in-new-tab.test.ts
@@ -544,15 +544,13 @@ describe('launchAgentInNewTab', () => {
 
     launchAgentInNewTab({ requestId: 'request-12', agent: 'codex', worktreeId: 'wt-1' })
 
-    expect(mockCreateWebRuntimeSessionTerminal).toHaveBeenCalledWith(
-      expect.objectContaining({
-        worktreeId: 'wt-1',
-        environmentId: 'web-runtime',
-        agentSessionKind: 'fresh',
-        agent: 'codex',
-        viewMode: 'terminal'
-      })
-    )
+    expect(mockCreateWebRuntimeSessionTerminal.mock.calls[0]?.[0]).toMatchObject({
+      worktreeId: 'wt-1',
+      environmentId: 'web-runtime',
+      agentSessionKind: 'fresh',
+      agent: 'codex',
+      viewMode: 'terminal'
+    })
   })
 
   it('propagates the resolved terminal mode to paired web runtime launches', async () => {
@@ -568,15 +566,13 @@ describe('launchAgentInNewTab', () => {
 
     launchAgentInNewTab({ requestId: 'request-13', agent: 'codex', worktreeId: 'wt-1' })
 
-    expect(mockCreateWebRuntimeSessionTerminal).toHaveBeenCalledWith(
-      expect.objectContaining({
-        worktreeId: 'wt-1',
-        environmentId: 'web-runtime',
-        agentSessionKind: 'fresh',
-        agent: 'codex',
-        viewMode: 'terminal'
-      })
-    )
+    expect(mockCreateWebRuntimeSessionTerminal.mock.calls[0]?.[0]).toMatchObject({
+      worktreeId: 'wt-1',
+      environmentId: 'web-runtime',
+      agentSessionKind: 'fresh',
+      agent: 'codex',
+      viewMode: 'terminal'
+    })
   })
 
   it('surfaces a toast when host agent launch fails in paired web clients', async () => {
diff --git a/src/renderer/src/lib/launch-agent-web-host-tab.ts b/src/renderer/src/lib/launch-agent-web-host-tab.ts
index 16fb8da79bd..352bc88f79f 100644
--- a/src/renderer/src/lib/launch-agent-web-host-tab.ts
+++ b/src/renderer/src/lib/launch-agent-web-host-tab.ts
@@ -122,7 +122,7 @@ export function launchAgentInWebHostTab(args: {
       launchDraft: prompt
     }).then((outcome) => handleCreation({ outcome, promptDelivered: outcome.status === 'created' }))
   }
-  return createWebRuntimeSessionTerminal(launch).then((outcome) =>
+  return createWebRuntimeSessionTerminal(launch, { notifyFailure: false }).then((outcome) =>
     handleCreation({ outcome, promptDelivered: outcome.status === 'created' && hasPrompt })
   )
 }
diff --git a/src/renderer/src/lib/launch-ai-vault-session.test.ts b/src/renderer/src/lib/launch-ai-vault-session.test.ts
index f51805a4526..5e8ed72b57f 100644
--- a/src/renderer/src/lib/launch-ai-vault-session.test.ts
+++ b/src/renderer/src/lib/launch-ai-vault-session.test.ts
@@ -178,24 +178,28 @@ describe('launchAiVaultSessionInNewTab', () => {
     })
 
     expect(result.tabId).toBeNull()
-    expect(runtimeMocks.createWebRuntimeSessionTerminal).toHaveBeenCalledWith({
-      worktreeId: 'wt-1',
-      environmentId: 'env-1',
-      targetGroupId: 'group-1',
-      agentSessionKind: 'resume',
-      launchAgent: 'codex',
-      command: "codex resume 'session-1'",
-      env: { CODEX_PROFILE: 'runtime' },
-      envToDelete: ['CODEX_HOME', 'ORCA_CODEX_HOME'],
-      launchConfig: {
-        agentCommand: 'codex',
+    expect(runtimeMocks.createWebRuntimeSessionTerminal).toHaveBeenCalledWith(
+      {
+        worktreeId: 'wt-1',
+        environmentId: 'env-1',
+        targetGroupId: 'group-1',
+        agentSessionKind: 'resume',
+        launchAgent: 'codex',
+        command: "codex resume 'session-1'",
+        env: { CODEX_PROFILE: 'runtime' },
+        envToDelete: ['CODEX_HOME', 'ORCA_CODEX_HOME'],
+        launchConfig: {
+          agentCommand: 'codex',
+          agentArgs: '',
+          agentEnv: { CODEX_PROFILE: 'runtime' }
+        },
+        providerSession: { key: 'session_id', id: 'session-1' },
         agentArgs: '',
-        agentEnv: { CODEX_PROFILE: 'runtime' }
+        activate: true
       },
-      providerSession: { key: 'session_id', id: 'session-1' },
-      agentArgs: '',
-      activate: true
-    })
+      // Its callers toast the failure with the agent's own wording.
+      { notifyFailure: false }
+    )
     expect(mockCreateTab).not.toHaveBeenCalled()
     expect(queuedStartups()).toEqual([])
 
@@ -220,7 +224,8 @@ describe('launchAiVaultSessionInNewTab', () => {
 
     expect(mockCreateEmptySplitGroup).toHaveBeenCalledWith('wt-1', 'group-1', 'right')
     expect(runtimeMocks.createWebRuntimeSessionTerminal).toHaveBeenCalledWith(
-      expect.objectContaining({ targetGroupId: 'group-new' })
+      expect.objectContaining({ targetGroupId: 'group-new' }),
+      { notifyFailure: false }
     )
     if (result.tabId === null) {
       await result.runtimeLaunch
diff --git a/src/renderer/src/lib/launch-ai-vault-session.ts b/src/renderer/src/lib/launch-ai-vault-session.ts
index dc1e849853f..b630483e51a 100644
--- a/src/renderer/src/lib/launch-ai-vault-session.ts
+++ b/src/renderer/src/lib/launch-ai-vault-session.ts
@@ -44,21 +44,24 @@ export function launchAiVaultSessionInNewTab(args: {
       ? store.createEmptySplitGroup(args.worktreeId, split.sourceGroupId, split.splitDirection)
       : null
     const targetGroupId = splitGroupId ?? args.targetGroupId
-    const runtimeLaunch = createWebRuntimeSessionTerminal({
-      worktreeId: args.worktreeId,
-      environmentId: runtimeEnvironmentId,
-      ...(targetGroupId ? { targetGroupId } : {}),
-      agentSessionKind: 'resume',
-      launchAgent: args.agent,
-      command: args.command,
-      ...(args.cwd ? { cwd: args.cwd } : {}),
-      ...(args.env ? { env: args.env } : {}),
-      ...(args.envToDelete ? { envToDelete: args.envToDelete } : {}),
-      ...(args.launchConfig ? { launchConfig: args.launchConfig } : {}),
-      ...(args.providerSession ? { providerSession: args.providerSession } : {}),
-      ...(args.launchConfig ? { agentArgs: args.launchConfig.agentArgs } : {}),
-      activate: true
-    })
+    const runtimeLaunch = createWebRuntimeSessionTerminal(
+      {
+        worktreeId: args.worktreeId,
+        environmentId: runtimeEnvironmentId,
+        ...(targetGroupId ? { targetGroupId } : {}),
+        agentSessionKind: 'resume',
+        launchAgent: args.agent,
+        command: args.command,
+        ...(args.cwd ? { cwd: args.cwd } : {}),
+        ...(args.env ? { env: args.env } : {}),
+        ...(args.envToDelete ? { envToDelete: args.envToDelete } : {}),
+        ...(args.launchConfig ? { launchConfig: args.launchConfig } : {}),
+        ...(args.providerSession ? { providerSession: args.providerSession } : {}),
+        ...(args.launchConfig ? { agentArgs: args.launchConfig.agentArgs } : {}),
+        activate: true
+      },
+      { notifyFailure: false }
+    )
     const observedRuntimeLaunch = runtimeLaunch.then((outcome) => {
       if (outcome.status === 'created') {
         useAppStore.getState().setActiveTabType('terminal', args.worktreeId)
diff --git a/src/renderer/src/lib/web-runtime-worktree-terminal-after-wake.ts b/src/renderer/src/lib/web-runtime-worktree-terminal-after-wake.ts
index f0fa00a14b5..ec3652b8bf7 100644
--- a/src/renderer/src/lib/web-runtime-worktree-terminal-after-wake.ts
+++ b/src/renderer/src/lib/web-runtime-worktree-terminal-after-wake.ts
@@ -115,26 +115,30 @@ export function ensureWebRuntimeWorktreeTerminalAfterWake(
 
   const startup = opts?.startup
   // Why: sleep keeps tab rows but terminal.stop clears host PTYs, while a failed create receipt leaves a selected agent with no host surface.
-  void createWebRuntimeSessionTerminal({
-    worktreeId,
-    environmentId: runtimeEnvironmentId,
-    ...(startup
-      ? {
-          command: startup.command,
-          ...(startup.env ? { env: startup.env } : {}),
-          ...(startup.launchConfig ? { launchConfig: startup.launchConfig } : {}),
-          ...(startup.launchToken ? { launchToken: startup.launchToken } : {}),
-          ...(launchAgent ? { launchAgent, preparedAgentCommand: true } : {}),
-          ...(startup.startupCommandDelivery
-            ? { startupCommandDelivery: startup.startupCommandDelivery }
-            : {})
-        }
-      : launchAgent
-        ? { agent: launchAgent }
-        : {}),
-    activate: opts?.activate !== false,
-    selectWorktree: false
-  })
+  void createWebRuntimeSessionTerminal(
+    {
+      worktreeId,
+      environmentId: runtimeEnvironmentId,
+      ...(startup
+        ? {
+            command: startup.command,
+            ...(startup.env ? { env: startup.env } : {}),
+            ...(startup.launchConfig ? { launchConfig: startup.launchConfig } : {}),
+            ...(startup.launchToken ? { launchToken: startup.launchToken } : {}),
+            ...(launchAgent ? { launchAgent, preparedAgentCommand: true } : {}),
+            ...(startup.startupCommandDelivery
+              ? { startupCommandDelivery: startup.startupCommandDelivery }
+              : {})
+          }
+        : launchAgent
+          ? { agent: launchAgent }
+          : {}),
+      activate: opts?.activate !== false,
+      selectWorktree: false
+    },
+    // This flow toasts every failure itself, including a disconnected host.
+    { notifyFailure: false }
+  )
     .then((outcome) => {
       if (outcome.status === 'failed') {
         toast.error(outcome.message, {
diff --git a/src/renderer/src/runtime/web-runtime-session-types.ts b/src/renderer/src/runtime/web-runtime-session-types.ts
index 97fa9d4aa4d..aeb015419d9 100644
--- a/src/renderer/src/runtime/web-runtime-session-types.ts
+++ b/src/renderer/src/runtime/web-runtime-session-types.ts
@@ -47,6 +47,8 @@ export type CreateWebRuntimeSessionTerminalArgs = {
 export type CreatedWebRuntimeSessionTerminal = {
   outcome: WebRuntimeTerminalCreateOutcome
   hostTabId?: string
+  /** A live session existed and the create was not confirmed, as opposed to no session to ask. */
+  hostFailed?: true
 }
 
 export type CreatedAgentTerminalIdentity = Pick<RuntimeTerminalCreate, 'tabId' | 'paneKey'> & {
diff --git a/src/renderer/src/runtime/web-runtime-terminal-create-failure-notice.test.ts b/src/renderer/src/runtime/web-runtime-terminal-create-failure-notice.test.ts
new file mode 100644
index 00000000000..23ecb7e7390
--- /dev/null
+++ b/src/renderer/src/runtime/web-runtime-terminal-create-failure-notice.test.ts
@@ -0,0 +1,171 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { createWebRuntimeSessionTerminal } from './web-runtime-terminal-creation'
+import { resetWebSessionCloseIntentForTests } from './web-session-close-intent'
+import {
+  WORKTREE_ID,
+  resetTerminalCreateEnvironment,
+  stubTerminalCreateEnvironment
+} from './web-runtime-session-test-harness'
+import { stubRuntimeEnvironmentBridge } from './runtime-environment-bridge-fixture'
+
+const mocks = vi.hoisted(() => ({
+  getState: vi.fn(),
+  setState: vi.fn(),
+  subscribe: vi.fn(),
+  setActiveWorktree: vi.fn(),
+  createBrowserTab: vi.fn(),
+  closeEmptyGroup: vi.fn(),
+  moveUnifiedTabToGroup: vi.fn(),
+  setRemoteBrowserPageHandle: vi.fn(),
+  focusBrowserTabInWorktree: vi.fn(),
+  applyWebSessionTabsSnapshot: vi.fn(),
+  decideWebSessionTabsSnapshot: vi.fn(() => ({ apply: true, settlesHostMirror: true })),
+  getWebSessionTabsTrackingGeneration: vi.fn(() => 0),
+  acceptReplayedWebSessionTabsSnapshot: vi.fn(),
+  resolveHostSessionTabIdForWebSessionTab: vi.fn(),
+  trackTerminalPaneSplit: vi.fn(),
+  deliverLaunchPromptToAgentTab: vi.fn(),
+  seedNativeChatLaunchDraftForAgentTab: vi.fn(),
+  hasMaterializedWebRuntimeBrowserPage: vi.fn(),
+  toastError: vi.fn()
+}))
+
+vi.mock('../store', () => ({
+  useAppStore: {
+    getState: mocks.getState,
+    setState: mocks.setState,
+    subscribe: mocks.subscribe
+  }
+}))
+
+vi.mock('./web-session-tabs-sync/tracking-lifecycle', () => ({
+  acceptReplayedWebSessionTabsSnapshot: mocks.acceptReplayedWebSessionTabsSnapshot,
+  getWebSessionTabsTrackingGeneration: mocks.getWebSessionTabsTrackingGeneration
+}))
+vi.mock('./web-session-tabs-sync/snapshot-api', () => ({
+  applyWebSessionTabsSnapshot: mocks.applyWebSessionTabsSnapshot
+}))
+vi.mock('./web-session-tabs-sync/tracking-decisions', () => ({
+  decideWebSessionTabsSnapshot: mocks.decideWebSessionTabsSnapshot
+}))
+vi.mock('./web-session-tabs-sync/store-patch', () => ({
+  applyWebSessionTabsStorePatch: (buildPatch: (state: unknown) => unknown) => {
+    mocks.setState(buildPatch)
+    // The production caller invokes the returned settle receipt.
+    return () => {}
+  }
+}))
+vi.mock('./web-session-tabs-sync/tracking-mappings', () => ({
+  resolveHostSessionTabIdForWebSessionTab: mocks.resolveHostSessionTabIdForWebSessionTab
+}))
+
+vi.mock('@/lib/feature-education-telemetry', () => ({
+  trackTerminalPaneSplit: mocks.trackTerminalPaneSplit
+}))
+
+vi.mock('@/lib/agent-launch-prompt-delivery', () => ({
+  deliverLaunchPromptToAgentTab: mocks.deliverLaunchPromptToAgentTab,
+  seedNativeChatLaunchDraftForAgentTab: mocks.seedNativeChatLaunchDraftForAgentTab
+}))
+
+vi.mock('./web-runtime-browser-materialization', () => ({
+  hasMaterializedWebRuntimeBrowserPage: mocks.hasMaterializedWebRuntimeBrowserPage
+}))
+
+vi.mock('sonner', () => ({ toast: { error: mocks.toastError } }))
+
+afterEach(() => resetWebSessionCloseIntentForTests())
+
+const HOST_REFUSAL = 'Profile state write failed without a confirmed rollback'
+
+describe('a terminal the host fails to create', () => {
+  beforeEach(() => {
+    stubTerminalCreateEnvironment(mocks)
+  })
+
+  afterEach(() => {
+    resetTerminalCreateEnvironment()
+  })
+
+  it('passes on the host’s reason, since no tab or pane will ever show it', async () => {
+    stubRuntimeEnvironmentBridge({
+      call: vi.fn().mockResolvedValue({
+        id: 'create',
+        ok: false,
+        error: { code: 'runtime_error', message: HOST_REFUSAL }
+      })
+    })
+    vi.spyOn(console, 'warn').mockImplementation(() => undefined)
+
+    await expect(
+      createWebRuntimeSessionTerminal({ worktreeId: WORKTREE_ID, activate: true })
+    ).resolves.toMatchObject({ status: 'failed' })
+
+    expect(mocks.toastError).toHaveBeenCalledExactlyOnceWith(
+      'Orca couldn’t confirm that the new terminal opened on the host.',
+      expect.objectContaining({ description: expect.stringContaining(HOST_REFUSAL) })
+    )
+    // One toast per workspace however often automatic seeding retries.
+    expect(mocks.toastError.mock.calls[0][1]).toMatchObject({
+      id: `web-runtime-terminal-create:active:${WORKTREE_ID}`
+    })
+  })
+
+  it('says unconfirmed, never failed, when the reply was lost', async () => {
+    stubRuntimeEnvironmentBridge({
+      call: vi.fn().mockResolvedValue({
+        id: 'create',
+        ok: false,
+        error: { code: 'runtime_timeout', message: 'Timed out waiting for the remote Orca runtime' }
+      })
+    })
+    vi.spyOn(console, 'warn').mockImplementation(() => undefined)
+
+    await createWebRuntimeSessionTerminal({ worktreeId: WORKTREE_ID, activate: true })
+
+    expect(mocks.toastError).toHaveBeenCalledExactlyOnceWith(
+      'Orca couldn’t confirm that the new terminal opened on the host.',
+      expect.objectContaining({ description: expect.stringContaining('Timed out') })
+    )
+  })
+
+  it('says the same for a browser client request timeout', async () => {
+    stubRuntimeEnvironmentBridge({
+      call: vi.fn().mockRejectedValue(new Error('Request timed out: session.tabs.createTerminal'))
+    })
+    vi.spyOn(console, 'warn').mockImplementation(() => undefined)
+
+    await createWebRuntimeSessionTerminal({ worktreeId: WORKTREE_ID, activate: true })
+
+    expect(mocks.toastError).toHaveBeenCalledExactlyOnceWith(
+      'Orca couldn’t confirm that the new terminal opened on the host.',
+      expect.objectContaining({ description: expect.stringContaining('Request timed out') })
+    )
+  })
+
+  it('stays quiet for a caller that reports the failure itself', async () => {
+    stubRuntimeEnvironmentBridge({
+      call: vi.fn().mockResolvedValue({
+        id: 'create',
+        ok: false,
+        error: { code: 'runtime_error', message: HOST_REFUSAL }
+      })
+    })
+    vi.spyOn(console, 'warn').mockImplementation(() => undefined)
+
+    await createWebRuntimeSessionTerminal(
+      { worktreeId: WORKTREE_ID, activate: true },
+      { notifyFailure: false }
+    )
+    expect(mocks.toastError).not.toHaveBeenCalled()
+  })
+
+  it('stays quiet when no host session exists, so callers can fall back to a local tab', async () => {
+    vi.stubGlobal('__ORCA_WEB_CLIENT__', false)
+    mocks.getState.mockReturnValue({ ...mocks.getState(), settings: {} })
+    await expect(
+      createWebRuntimeSessionTerminal({ worktreeId: WORKTREE_ID, activate: true })
+    ).resolves.toMatchObject({ status: 'failed' })
+    expect(mocks.toastError).not.toHaveBeenCalled()
+  })
+})
diff --git a/src/renderer/src/runtime/web-runtime-terminal-create-failure-notice.ts b/src/renderer/src/runtime/web-runtime-terminal-create-failure-notice.ts
new file mode 100644
index 00000000000..2fefbb0aff6
--- /dev/null
+++ b/src/renderer/src/runtime/web-runtime-terminal-create-failure-notice.ts
@@ -0,0 +1,24 @@
+import { toast } from 'sonner'
+import { translate } from '@/i18n/i18n'
+
+/**
+ * The user asked for a terminal and the host never mirrored one, so no pane exists to show why.
+ * "Couldn't confirm" stays true when the reply was lost and the terminal appears later; the reason
+ * carries the host's refusal or the transport failure as reported. No retry: it could duplicate.
+ */
+export function notifyWebRuntimeTerminalCreateFailure(
+  reason: string,
+  scope: { environmentId: string | null; worktreeId: string }
+): void {
+  toast.error(
+    translate(
+      'auto.runtime.webRuntimeSession.terminalCreateUnconfirmed',
+      'Orca couldn’t confirm that the new terminal opened on the host.'
+    ),
+    {
+      // Why an id: automatic seeding retries on every reconnect and must not stack toasts.
+      id: `web-runtime-terminal-create:${scope.environmentId ?? 'active'}:${scope.worktreeId}`,
+      ...(reason ? { description: reason } : {})
+    }
+  )
+}
diff --git a/src/renderer/src/runtime/web-runtime-terminal-create-operation.ts b/src/renderer/src/runtime/web-runtime-terminal-create-operation.ts
index fefa66f4f66..955e51e9b08 100644
--- a/src/renderer/src/runtime/web-runtime-terminal-create-operation.ts
+++ b/src/renderer/src/runtime/web-runtime-terminal-create-operation.ts
@@ -296,7 +296,8 @@ export async function createWebRuntimeSessionTerminalResult(
     // to retry with a new operation ID and can duplicate a fresh agent.
     return {
       outcome: hostCreated ? { status: 'created' } : { status: 'failed', message },
-      ...(createdTabId ? { hostTabId: createdTabId } : {})
+      ...(createdTabId ? { hostTabId: createdTabId } : {}),
+      ...(hostCreated ? {} : { hostFailed: true as const })
     }
   }
 }
diff --git a/src/renderer/src/runtime/web-runtime-terminal-creation.ts b/src/renderer/src/runtime/web-runtime-terminal-creation.ts
index 42567f76ba5..bde5df66a78 100644
--- a/src/renderer/src/runtime/web-runtime-terminal-creation.ts
+++ b/src/renderer/src/runtime/web-runtime-terminal-creation.ts
@@ -4,16 +4,33 @@ import {
   seedNativeChatLaunchDraftForAgentTab
 } from '../lib/agent-launch-prompt-delivery'
 import { createWebRuntimeSessionTerminalResult } from './web-runtime-terminal-create-operation'
+import { notifyWebRuntimeTerminalCreateFailure } from './web-runtime-terminal-create-failure-notice'
 import { toWebTerminalSurfaceTabId } from '../../../shared/terminal-surface-id'
 import type {
   CreateWebRuntimeSessionTerminalArgs,
   WebRuntimeTerminalCreateOutcome
 } from './web-runtime-session-types'
 
+/**
+ * A host-side failure is toasted here because the host never mirrors a tab for it, so no pane
+ * exists to show the error. `notifyFailure: false` is for callers that report it themselves.
+ */
 export async function createWebRuntimeSessionTerminal(
-  args: CreateWebRuntimeSessionTerminalArgs
+  args: CreateWebRuntimeSessionTerminalArgs,
+  options: { notifyFailure?: boolean } = {}
 ): Promise<WebRuntimeTerminalCreateOutcome> {
-  return (await createWebRuntimeSessionTerminalResult(args)).outcome
+  const created = await createWebRuntimeSessionTerminalResult(args)
+  if (
+    created.hostFailed &&
+    created.outcome.status === 'failed' &&
+    options.notifyFailure !== false
+  ) {
+    notifyWebRuntimeTerminalCreateFailure(created.outcome.message, {
+      environmentId: args.environmentId ?? null,
+      worktreeId: args.worktreeId
+    })
+  }
+  return created.outcome
 }
 
 export async function createWebRuntimeAgentSessionTerminal(