diff --git a/src/main/claude-accounts/runtime-selection.ts b/src/main/claude-accounts/runtime-selection.ts
index 7d51e345e8f..06f00c025c6 100644
--- a/src/main/claude-accounts/runtime-selection.ts
+++ b/src/main/claude-accounts/runtime-selection.ts
@@ -136,7 +136,7 @@ export function pruneInvalidClaudeRuntimeSelection(
 }
 
 export function getClaudeSelectionTargetForAccount(
-  account: ClaudeManagedAccount
+  account: Pick<ClaudeManagedAccount, 'managedAuthRuntime' | 'wslDistro'>
 ): ClaudeAccountSelectionTarget {
   if (account.managedAuthRuntime === 'wsl') {
     return { runtime: 'wsl', wslDistro: account.wslDistro ?? null }
diff --git a/src/main/runtime/construction/runtime-host-services.ts b/src/main/runtime/construction/runtime-host-services.ts
index 2daaad64865..c9e76e6654e 100644
--- a/src/main/runtime/construction/runtime-host-services.ts
+++ b/src/main/runtime/construction/runtime-host-services.ts
@@ -272,7 +272,7 @@ export abstract class OrcaRuntimeWithPreservedBranchCleanup extends OrcaRuntimeW
 
   protected ptyControllerInventoryGenerationByProvider = new Map<string, number>()
 
-  protected readonly accounts = new RuntimeAccountController()
+  protected readonly accounts = new RuntimeAccountController(() => this.notifier)
 
   protected readonly mobileSpeech = new RuntimeMobileSpeechCatalog(() => this.store)
 
diff --git a/src/main/runtime/rpc/methods/accounts.ts b/src/main/runtime/rpc/methods/accounts.ts
index fa357dd5453..46a3663b286 100644
--- a/src/main/runtime/rpc/methods/accounts.ts
+++ b/src/main/runtime/rpc/methods/accounts.ts
@@ -16,6 +16,7 @@ import {
   ListAccountsParams,
   RemoveAccountParams,
   SelectAccountParams,
+  SelectClaudeAccountParams,
   SelectCodexAccountForTargetParams,
   HostAccountSignInStartParams,
   HostAccountSignInWaitParams,
@@ -142,8 +143,11 @@ const ACCOUNT_METHOD_DEFINITIONS = [
   defineMethod({
     name: 'accounts.selectClaude',
     permission: 'accounts-admin',
-    params: SelectAccountParams,
-    handler: async (params, { runtime }) => runtime.selectClaudeAccount(params.accountId)
+    params: SelectClaudeAccountParams,
+    handler: async (params, { runtime }) =>
+      runtime.selectClaudeAccount(params.accountId, {
+        movesRunningSessions: params.movesRunningSessions
+      })
   }),
   defineMethod({
     name: 'accounts.selectCodex',
diff --git a/src/main/runtime/runtime-account-controller.test.ts b/src/main/runtime/runtime-account-controller.test.ts
new file mode 100644
index 00000000000..e8629c4580f
--- /dev/null
+++ b/src/main/runtime/runtime-account-controller.test.ts
@@ -0,0 +1,58 @@
+import { describe, expect, it, vi } from 'vitest'
+import type { ClaudeRateLimitAccountsState } from '../../shared/managed-account-types'
+import { RuntimeAccountController, type RuntimeAccountServices } from './runtime-account-controller'
+
+// The saved lane key may differ in case from the account's distro, as older selections do.
+function claudeState(wslAccountId: string | null): ClaudeRateLimitAccountsState {
+  return {
+    activeAccountId: null,
+    activeAccountIdsByRuntime: { host: null, wsl: { ubuntu: wslAccountId } },
+    accounts: [
+      {
+        id: 'wsl-b',
+        email: 'b@example.com',
+        managedAuthRuntime: 'wsl',
+        wslDistro: 'Ubuntu',
+        authMethod: 'subscription-oauth',
+        createdAt: 1,
+        updatedAt: 1,
+        lastAuthenticatedAt: 1
+      }
+    ]
+  }
+}
+
+function controllerWithSwitch(): {
+  accounts: RuntimeAccountController
+  onClaudeSelected: ReturnType<typeof vi.fn>
+} {
+  const onClaudeSelected = vi.fn()
+  const accounts = new RuntimeAccountController(() => ({
+    claudeAccountSelected: onClaudeSelected
+  }))
+  const claudeAccounts = {
+    listAccounts: () => claudeState(null),
+    selectAccount: async (accountId: string | null) => claudeState(accountId)
+  }
+  // oxlint-disable-next-line typescript/consistent-type-assertions -- SAFETY: selectClaude reads only these two methods.
+  accounts.setServices({ claudeAccounts } as unknown as RuntimeAccountServices)
+  return { accounts, onClaudeSelected }
+}
+
+describe('RuntimeAccountController.selectClaude', () => {
+  it("tells the window about a phone switch, on the selected account's lane", async () => {
+    const { accounts, onClaudeSelected } = controllerWithSwitch()
+    await accounts.selectClaude('wsl-b')
+    expect(onClaudeSelected).toHaveBeenCalledWith({
+      target: { runtime: 'wsl', wslDistro: 'Ubuntu' },
+      before: { state: claudeState(null), accountId: null },
+      after: { state: claudeState('wsl-b'), accountId: 'wsl-b' }
+    })
+  })
+
+  it('leaves a web client switch to the web client, which moves its own sessions', async () => {
+    const { accounts, onClaudeSelected } = controllerWithSwitch()
+    await accounts.selectClaude('wsl-b', { movesRunningSessions: true })
+    expect(onClaudeSelected).not.toHaveBeenCalled()
+  })
+})
diff --git a/src/main/runtime/runtime-account-controller.ts b/src/main/runtime/runtime-account-controller.ts
index 5c2efc8a4d7..4213b407bda 100644
--- a/src/main/runtime/runtime-account-controller.ts
+++ b/src/main/runtime/runtime-account-controller.ts
@@ -23,13 +23,18 @@ import type {
 import type { CodexRateLimitResetOutcome, RateLimitState } from '../../shared/rate-limit-types'
 import type { CodexResetCreditExpectedScope } from '../../shared/codex-reset-credit-scope'
 import type { CommitMessageAgentEnvironmentResolvers } from '../text-generation/commit-message-agent-environment'
-import type { ClaudeAccountSelectionTarget } from '../claude-accounts/runtime-selection'
+import {
+  getClaudeSelectionTargetForAccount,
+  getSelectedClaudeAccountIdForTarget,
+  type ClaudeAccountSelectionTarget
+} from '../claude-accounts/runtime-selection'
 import {
   hostAccountsManagedByDesktopMessage,
   type HostAccountLaunchEnv
 } from '../../shared/host-account-launch-env'
 import type { HostClaudeProfileRefresh } from './host-claude-profile-refresh'
 import { HostAccountLaunchEnvState } from './host-account-launch-env-state'
+import type { RuntimeNotifier } from './runtime-notifier-contract'
 
 export type RuntimeAccountServices = {
   claudeAccounts: ClaudeAccountService
@@ -57,11 +62,15 @@ export type CodexRateLimitResetRpcResult = {
     }
 )
 
+type ClaudeSelectionNotifier = Pick<RuntimeNotifier, 'claudeAccountSelected'>
+
 export class RuntimeAccountController {
   private services: RuntimeAccountServices | null = null
   private commitMessageAgentEnvironment: CommitMessageAgentEnvironmentResolvers | null = null
   private readonly hostAccounts = new HostAccountLaunchEnvState(() => this.services !== null)
 
+  constructor(private readonly getNotifier: () => ClaudeSelectionNotifier | null = () => null) {}
+
   setServices(services: RuntimeAccountServices): void {
     this.services = services
   }
@@ -195,8 +204,27 @@ export class RuntimeAccountController {
     ])
   }
 
-  selectClaude(accountId: string | null): Promise<ClaudeRateLimitAccountsState> {
-    return this.requireServices().claudeAccounts.selectAccount(accountId)
+  /** Desktop switches go through IPC and handle their own sessions; this path tells the window. */
+  async selectClaude(
+    accountId: string | null,
+    options: { movesRunningSessions?: true } = {}
+  ): Promise<ClaudeRateLimitAccountsState> {
+    const { claudeAccounts } = this.requireServices()
+    if (options.movesRunningSessions) {
+      return claudeAccounts.selectAccount(accountId)
+    }
+    const before = claudeAccounts.listAccounts()
+    const after = await claudeAccounts.selectAccount(accountId)
+    const account = before.accounts.find((candidate) => candidate.id === accountId)
+    const target: ClaudeAccountSelectionTarget = account
+      ? getClaudeSelectionTargetForAccount(account)
+      : { runtime: 'host' }
+    this.getNotifier()?.claudeAccountSelected?.({
+      target,
+      before: { state: before, accountId: selectedClaudeAccountId(before, target) },
+      after: { state: after, accountId: selectedClaudeAccountId(after, target) }
+    })
+    return after
   }
 
   selectCodex(accountId: string | null): Promise<CodexRateLimitAccountsState> {
@@ -303,3 +331,16 @@ export class RuntimeAccountController {
     return this.services
   }
 }
+
+function selectedClaudeAccountId(
+  state: ClaudeRateLimitAccountsState,
+  target: ClaudeAccountSelectionTarget
+): string | null {
+  return getSelectedClaudeAccountIdForTarget(
+    {
+      activeClaudeManagedAccountId: state.activeAccountId,
+      activeClaudeManagedAccountIdsByRuntime: state.activeAccountIdsByRuntime
+    },
+    target
+  )
+}
diff --git a/src/main/runtime/runtime-notifier-contract.ts b/src/main/runtime/runtime-notifier-contract.ts
index c1656c3d36e..0f304ccfda5 100644
--- a/src/main/runtime/runtime-notifier-contract.ts
+++ b/src/main/runtime/runtime-notifier-contract.ts
@@ -2,6 +2,7 @@ import type {
   RuntimeEditorTabReveal,
   RuntimeFileOpenPosition
 } from '../../shared/runtime-file-contracts'
+import type { ClaudeAccountSelectionChange } from '../../shared/managed-account-types'
 import type { AgentLaunchPaneVerdictEvent } from '../../shared/agent-launch-pane-verdict'
 import type { SleepingAgentLaunchConfig } from '../../shared/agent-session-resume'
 import type { PaneLaunchRecipe } from '../../shared/terminal-attachment-launch-result'
@@ -180,4 +181,5 @@ export type RuntimeNotifier = {
   browserDriverChanged?(browserPageId: string, driver: RuntimeBrowserDriverState): void
   browserRemoteViewersChanged?(browserPageId: string, hasRemoteViewers: boolean): void
   clientHostedBrowserRowsChanged?(event: ClientHostedBrowserRowsEvent): void
+  claudeAccountSelected?(change: ClaudeAccountSelectionChange): void
 }
diff --git a/src/main/runtime/runtime-rpc-mobile-method-allowlist.test.ts b/src/main/runtime/runtime-rpc-mobile-method-allowlist.test.ts
index aa32994ca90..81a5199592f 100644
--- a/src/main/runtime/runtime-rpc-mobile-method-allowlist.test.ts
+++ b/src/main/runtime/runtime-rpc-mobile-method-allowlist.test.ts
@@ -621,7 +621,7 @@ describe('OrcaRuntimeRpcServer', () => {
         error: expect.objectContaining({ code: 'forbidden' })
       })
     )
-    expect(mocks.selectClaudeAccount).toHaveBeenCalledWith('claude-account')
+    expect(mocks.selectClaudeAccount).toHaveBeenCalledWith('claude-account', {})
     expect(mocks.selectCodexAccount).toHaveBeenCalledWith(null)
     expect(mocks.consumeCodexRateLimitResetCredit).toHaveBeenCalledWith(
       '11111111-1111-4111-8111-111111111111',
diff --git a/src/main/window/runtime-window-lifecycle.ts b/src/main/window/runtime-window-lifecycle.ts
index eea396f5986..7f60877ebc6 100644
--- a/src/main/window/runtime-window-lifecycle.ts
+++ b/src/main/window/runtime-window-lifecycle.ts
@@ -227,7 +227,9 @@ export function registerRuntimeWindowLifecycle(
       send('runtime:browserDriverChanged', { browserPageId, driver }),
     browserRemoteViewersChanged: (browserPageId, hasRemoteViewers) =>
       send('runtime:browserRemoteViewersChanged', { browserPageId, hasRemoteViewers }),
-    clientHostedBrowserRowsChanged: (event) => send('runtime:clientHostedBrowserRowsChanged', event)
+    clientHostedBrowserRowsChanged: (event) =>
+      send('runtime:clientHostedBrowserRowsChanged', event),
+    claudeAccountSelected: (change) => send('claudeAccounts:selectedElsewhere', change)
   })
   // Switch point: the window reads its sidebar from main's feed and re-reads on each notice.
   const detachSidebarInputsNotices = ORCA_SIDEBAR_INPUTS_IS_MAIN
diff --git a/src/preload/api/agent-account-api.ts b/src/preload/api/agent-account-api.ts
index ee59efe1be9..6b97a23cf6f 100644
--- a/src/preload/api/agent-account-api.ts
+++ b/src/preload/api/agent-account-api.ts
@@ -1,4 +1,5 @@
 import type {
+  ClaudeAccountSelectionChange,
   ClaudeRateLimitAccountsState,
   CodexRateLimitAccountsState
 } from '../../shared/managed-account-types'
@@ -62,6 +63,7 @@ export type ClaudeAccountsApi = {
     runtime?: 'host' | 'wsl'
     wslDistro?: string | null
   }) => Promise<ClaudeRateLimitAccountsState>
+  onSelectedElsewhere?: (callback: (change: ClaudeAccountSelectionChange) => void) => () => void
 }
 
 export type GrokAccountsApi = {
diff --git a/src/preload/api/claude-accounts-bridge.ts b/src/preload/api/claude-accounts-bridge.ts
index 2dd7d2c23b6..95da48caf8f 100644
--- a/src/preload/api/claude-accounts-bridge.ts
+++ b/src/preload/api/claude-accounts-bridge.ts
@@ -1,4 +1,5 @@
 import { ipcRenderer } from 'electron'
+import type { ClaudeAccountSelectionChange } from '../../shared/managed-account-types'
 import type { PreloadApi } from '../api-types'
 
 export const claudeAccountsApi = {
@@ -16,5 +17,11 @@ export const claudeAccountsApi = {
     accountId: string | null
     runtime?: 'host' | 'wsl'
     wslDistro?: string | null
-  }) => ipcRenderer.invoke('claudeAccounts:select', args)
+  }) => ipcRenderer.invoke('claudeAccounts:select', args),
+  onSelectedElsewhere: (callback: (change: ClaudeAccountSelectionChange) => void) => {
+    const listener = (_event: Electron.IpcRendererEvent, change: ClaudeAccountSelectionChange) =>
+      callback(change)
+    ipcRenderer.on('claudeAccounts:selectedElsewhere', listener)
+    return () => ipcRenderer.removeListener('claudeAccounts:selectedElsewhere', listener)
+  }
 } satisfies PreloadApi['claudeAccounts']
diff --git a/src/renderer/src/hooks/ipc-events/app-lifetime-ipc-bridge.ts b/src/renderer/src/hooks/ipc-events/app-lifetime-ipc-bridge.ts
index 15e789930fd..a853f8f0bca 100644
--- a/src/renderer/src/hooks/ipc-events/app-lifetime-ipc-bridge.ts
+++ b/src/renderer/src/hooks/ipc-events/app-lifetime-ipc-bridge.ts
@@ -24,6 +24,7 @@ import { registerPreflightWslRetryIpcBridge } from './preflight-wsl-retry-ipc-br
 import { registerOsMarkdownFileOpenBridge } from './os-markdown-file-open-bridge'
 import { registerProjectCatalogIpcBridge } from './project-catalog-ipc-bridge'
 import { registerRateLimitIpcBridge } from './rate-limit-ipc-bridge'
+import { registerClaudeAccountSwitchIpcBridge } from './claude-account-switch-ipc-bridge'
 import { registerRuntimeClientIpcBridge } from './runtime-client-ipc-bridge'
 import { registerSessionTabIpcBridge } from './session-tab-ipc-bridge'
 import { registerSettingsAndSidebarIpcBridge } from './settings-sidebar-ipc-bridge'
@@ -136,6 +137,7 @@ export function installAppLifetimeIpcEvents(): () => void {
   registerBrowserTabActivateIpcBridge(unsubs)
   registerTabLifecycleIpcBridge(unsubs)
   registerRateLimitIpcBridge(unsubs)
+  registerClaudeAccountSwitchIpcBridge(unsubs)
   const stopDirectSshStateBridge = registerDirectSshStateIpcBridge(unsubs)
   registerZoomIpcBridge(unsubs)
   const agentStatusBridge = registerAgentStatusIpcBridge(unsubs)
diff --git a/src/renderer/src/hooks/ipc-events/claude-account-switch-ipc-bridge.ts b/src/renderer/src/hooks/ipc-events/claude-account-switch-ipc-bridge.ts
new file mode 100644
index 00000000000..1b2c738a8c4
--- /dev/null
+++ b/src/renderer/src/hooks/ipc-events/claude-account-switch-ipc-bridge.ts
@@ -0,0 +1,13 @@
+import { handleRunningClaudeSessionsAfterSwitch } from '@/lib/claude-account-switch-sessions'
+
+export function registerClaudeAccountSwitchIpcBridge(unsubs: (() => void)[]): void {
+  const subscribe = window.api.claudeAccounts?.onSelectedElsewhere
+  if (!subscribe) {
+    return
+  }
+  unsubs.push(
+    subscribe((change) => {
+      void handleRunningClaudeSessionsAfterSwitch({ owner: { kind: 'local' }, ...change })
+    })
+  )
+}
diff --git a/src/renderer/src/web/preload-api/web-agent-accounts-api.ts b/src/renderer/src/web/preload-api/web-agent-accounts-api.ts
index f07fba0c893..87e1be5bca5 100644
--- a/src/renderer/src/web/preload-api/web-agent-accounts-api.ts
+++ b/src/renderer/src/web/preload-api/web-agent-accounts-api.ts
@@ -133,7 +133,8 @@ export function createClaudeAccountsApi(): PreloadApi['claudeAccounts'] {
       }
       return callRuntimeResult<ClaudeRateLimitAccountsState>(
         'accounts.selectClaude',
-        { accountId },
+        // This window's switcher moves running sessions itself; the host window must not too.
+        { accountId, movesRunningSessions: true },
         ACCOUNT_MUTATION_TIMEOUT_MS
       )
     }
diff --git a/src/renderer/src/web/web-preload-api-rate-limits.test.ts b/src/renderer/src/web/web-preload-api-rate-limits.test.ts
index e9bd0995da2..9dc88a7bb00 100644
--- a/src/renderer/src/web/web-preload-api-rate-limits.test.ts
+++ b/src/renderer/src/web/web-preload-api-rate-limits.test.ts
@@ -222,7 +222,7 @@ describe('web rate limits and accounts preload API', () => {
     await expect(api.claudeAccounts.select({ accountId: 'account-b' })).resolves.toEqual(selected)
     expect(calls).toContainEqual({
       method: 'accounts.selectClaude',
-      params: { accountId: 'account-b' }
+      params: { accountId: 'account-b', movesRunningSessions: true }
     })
   })
 
diff --git a/src/shared/managed-account-types.ts b/src/shared/managed-account-types.ts
index 595c777895e..3a870d6c356 100644
--- a/src/shared/managed-account-types.ts
+++ b/src/shared/managed-account-types.ts
@@ -1,3 +1,5 @@
+import type { CodexAccountSelectionTarget } from './codex-selection-lane'
+
 export type ManagedDataAccountProvider = 'opencode' | 'devin'
 
 export type ManagedDataAccountSummary = {
@@ -128,6 +130,13 @@ export type ClaudeRateLimitAccountsState = {
   systemDefaultMayBeCopied?: boolean
 }
 
+/** A Claude switch made over runtime RPC, e.g. from the phone. */
+export type ClaudeAccountSelectionChange = {
+  target: CodexAccountSelectionTarget
+  before: { state: ClaudeRateLimitAccountsState; accountId: string | null }
+  after: { state: ClaudeRateLimitAccountsState; accountId: string | null }
+}
+
 export type ClaudeManagedAccountRuntimeSelection = {
   host: string | null
   wsl: Record<string, string | null>
diff --git a/src/shared/rpc-contract/accounts-params.ts b/src/shared/rpc-contract/accounts-params.ts
index c6fd5025b1b..507438ea3d3 100644
--- a/src/shared/rpc-contract/accounts-params.ts
+++ b/src/shared/rpc-contract/accounts-params.ts
@@ -37,6 +37,11 @@ export const SelectAccountParams = z.object({
     .transform((v) => (v === null ? null : v))
 })
 
+export const SelectClaudeAccountParams = SelectAccountParams.extend({
+  // The web client moves running sessions in its own window; older hosts strip this.
+  movesRunningSessions: z.literal(true).optional()
+})
+
 export const SelectCodexAccountForTargetParams = SelectAccountParams.extend({
   target: CodexSelectionTarget
 })
diff --git a/src/shared/rpc-contract/rpc-params-catalog.generated.ts b/src/shared/rpc-contract/rpc-params-catalog.generated.ts
index 992134b4f25..be03d1d8af1 100644
--- a/src/shared/rpc-contract/rpc-params-catalog.generated.ts
+++ b/src/shared/rpc-contract/rpc-params-catalog.generated.ts
@@ -59,6 +59,7 @@ import {
   RemoveAccountParams,
   RemoveDataAccountParams,
   SelectAccountParams,
+  SelectClaudeAccountParams,
   SelectCodexAccountForTargetParams,
   SelectDataAccountParams
 } from './accounts-params'
@@ -746,7 +747,7 @@ export const RPC_PARAMS_BY_METHOD = {
   'accounts.removeClaude': RemoveAccountParams,
   'accounts.removeCodex': RemoveAccountParams,
   'accounts.removeData': RemoveDataAccountParams,
-  'accounts.selectClaude': SelectAccountParams,
+  'accounts.selectClaude': SelectClaudeAccountParams,
   'accounts.selectCodex': SelectAccountParams,
   'accounts.selectCodexForTarget': SelectCodexAccountForTargetParams,
   'accounts.selectData': SelectDataAccountParams,