diff --git a/apps/desktop-tauri/src/i18n/keys.ts b/apps/desktop-tauri/src/i18n/keys.ts
index 28811f426f..72c6057d57 100644
--- a/apps/desktop-tauri/src/i18n/keys.ts
+++ b/apps/desktop-tauri/src/i18n/keys.ts
@@ -293,6 +293,19 @@ export const ALL_LOCALE_KEYS = [
   "ProviderClaudeDailyRoutinesUsageHelp",
   "ProviderCodexSparkUsage",
   "ProviderCodexSparkUsageHelp",
+  "CodexAccountsTitle",
+  "CodexAccountsHint",
+  "CodexAccountsAddButton",
+  "CodexAccountsSwitchButton",
+  "CodexAccountsFetchButton",
+  "CodexAccountsRemoveButton",
+  "CodexAccountsEmpty",
+  "CodexAccountsSourceAmbient",
+  "CodexAccountsSourceManaged",
+  "CodexAccountsUsageUnavailable",
+  "CodexSwitchSuccess",
+  "CodexSwitchRestartPrompt",
+  "CodexAccountsRestartDesktop",
   "ProviderCursorCookieSourceHelp",
   "ProviderCursorCreditsHelp",
   "AutoFallbackHelp",
diff --git a/apps/desktop-tauri/src/lib/tauri.ts b/apps/desktop-tauri/src/lib/tauri.ts
index 27051c75e5..b51844fb58 100644
--- a/apps/desktop-tauri/src/lib/tauri.ts
+++ b/apps/desktop-tauri/src/lib/tauri.ts
@@ -34,6 +34,10 @@ import type {
   TrayVisibilityStatusDto,
   UsageSpendSummary,
   CodexLocalProjectUsageSnapshot,
+  CodexAccount,
+  CodexAccountUsageSnapshot,
+  CodexAccountsStateBridge,
+  CodexSwitchResult,
 } from "../types/bridge";
 
 export function getBootstrapState(): Promise<BootstrapState> {
@@ -436,3 +440,51 @@ export function flyoutStoredSize(): Promise<[number, number] | null> {
 export function quitApp(): Promise<void> {
   return invoke<void>("quit_app");
 }
+
+// ── Codex multi-account (ADR 0003) ───────────────────────────────────
+
+export function codexAccountsList(): Promise<CodexAccount[]> {
+  return invoke<CodexAccount[]>("codex_accounts_list");
+}
+
+export function codexAccountAdd(): Promise<CodexAccount> {
+  return invoke<CodexAccount>("codex_account_add");
+}
+
+export function codexAccountRemove(id: string): Promise<void> {
+  return invoke<void>("codex_account_remove", { id });
+}
+
+export function codexAccountSwitch(id: string): Promise<CodexSwitchResult> {
+  return invoke<CodexSwitchResult>("codex_account_switch", { id });
+}
+
+export function codexAccountFetch(
+  id: string,
+): Promise<CodexAccountUsageSnapshot> {
+  return invoke<CodexAccountUsageSnapshot>("codex_account_fetch", { id });
+}
+
+export function codexAccountSnapshots(): Promise<
+  Record<string, CodexAccountUsageSnapshot>
+> {
+  return invoke<Record<string, CodexAccountUsageSnapshot>>(
+    "codex_account_snapshots",
+  );
+}
+
+export function codexAccountRestartDesktop(
+  sessionRoot?: string | null,
+  backupDestination?: string | null,
+  restoreSource?: string | null,
+): Promise<void> {
+  return invoke<void>("codex_account_restart_desktop", {
+    sessionRoot,
+    backupDestination,
+    restoreSource,
+  });
+}
+
+export function getCodexAccountsState(): Promise<CodexAccountsStateBridge> {
+  return invoke<CodexAccountsStateBridge>("get_codex_accounts_state");
+}
diff --git a/apps/desktop-tauri/src/types/bridge.ts b/apps/desktop-tauri/src/types/bridge.ts
index 89e16af7a4..3d91b68cae 100644
--- a/apps/desktop-tauri/src/types/bridge.ts
+++ b/apps/desktop-tauri/src/types/bridge.ts
@@ -738,3 +738,58 @@ export interface RegionOption {
   value: string;
   label: string;
 }
+
+// ── Codex multi-account (ADR 0003) ───────────────────────────────────
+
+export type CodexAccountSource = "ambient" | "managedByApp";
+
+export interface CodexAccount {
+  id: string;
+  nickname: string | null;
+  emailHint: string | null;
+  authSubject: string | null;
+  providerAccountId: string | null;
+  codexHomePath: string;
+  source: CodexAccountSource;
+  createdAt: string;
+  updatedAt: string;
+  lastAuthenticatedAt: string | null;
+}
+
+export interface CodexUsageWindow {
+  usedPercent: number;
+  resetAt: string | null;
+  limitWindowSeconds: number;
+}
+
+export interface CodexCreditsBalance {
+  hasCredits: boolean;
+  unlimited: boolean;
+  balance: number | null;
+}
+
+export interface CodexAccountUsageSnapshot {
+  email: string | null;
+  providerAccountId: string | null;
+  plan: string | null;
+  allowed: boolean | null;
+  limitReached: boolean | null;
+  primaryWindow: CodexUsageWindow | null;
+  secondaryWindow: CodexUsageWindow | null;
+  credits: CodexCreditsBalance | null;
+  updatedAt: string;
+}
+
+export interface CodexSwitchResult {
+  materializedAccount: CodexAccount | null;
+  backupPath: string | null;
+  ambientAccount: CodexAccount | null;
+  desktopSessionBackupPath: string | null;
+  desktopSessionRestorePath: string | null;
+  desktopSessionRestoreExists: boolean;
+}
+
+export interface CodexAccountsStateBridge {
+  accounts: CodexAccount[];
+  snapshots: Record<string, CodexAccountUsageSnapshot>;
+}
diff --git a/rust/src/locale.rs b/rust/src/locale.rs
index 7bb2b92a07..cf86892e56 100644
--- a/rust/src/locale.rs
+++ b/rust/src/locale.rs
@@ -509,6 +509,19 @@ locale_keys! {
     ProviderClaudeDailyRoutinesUsageHelp,
     ProviderCodexSparkUsage,
     ProviderCodexSparkUsageHelp,
+    CodexAccountsTitle,
+    CodexAccountsHint,
+    CodexAccountsAddButton,
+    CodexAccountsSwitchButton,
+    CodexAccountsFetchButton,
+    CodexAccountsRemoveButton,
+    CodexAccountsEmpty,
+    CodexAccountsSourceAmbient,
+    CodexAccountsSourceManaged,
+    CodexAccountsUsageUnavailable,
+    CodexSwitchSuccess,
+    CodexSwitchRestartPrompt,
+    CodexAccountsRestartDesktop,
     ProviderCursorCookieSourceHelp,
     ProviderCursorCreditsHelp,
     AutoFallbackHelp,
diff --git a/rust/src/locale/en-US.ftl b/rust/src/locale/en-US.ftl
index aa289501e0..42946a7dee 100644
--- a/rust/src/locale/en-US.ftl
+++ b/rust/src/locale/en-US.ftl
@@ -288,6 +288,19 @@ ProviderClaudeDailyRoutinesUsage = Show Daily Routines usage
 ProviderClaudeDailyRoutinesUsageHelp = Show the Daily Routines quota row for Claude web and OAuth usage.
 ProviderCodexSparkUsage = Show Codex Spark usage
 ProviderCodexSparkUsageHelp = Show Codex Spark quota rows without hiding credits or other extra usage.
+CodexAccountsTitle = Codex Accounts
+CodexAccountsHint = Manage multiple Codex accounts. Each account lives in its own managed home; switching updates the active identity.
+CodexAccountsAddButton = Add account
+CodexAccountsSwitchButton = Switch
+CodexAccountsFetchButton = Refresh usage
+CodexAccountsRemoveButton = Remove
+CodexAccountsEmpty = No Codex accounts found.
+CodexAccountsSourceAmbient = Ambient
+CodexAccountsSourceManaged = Managed
+CodexAccountsUsageUnavailable = No usage data
+CodexSwitchSuccess = Active account switched.
+CodexSwitchRestartPrompt = Restart Codex Desktop to load the restored session?
+CodexAccountsRestartDesktop = Restart Codex Desktop
 ProviderCursorCookieSourceHelp = Automatic imports browser cookies or stored sessions.
 ProviderCursorCreditsHelp = On-demand usage beyond included plan limits.
 AutoFallbackHelp = Auto falls back to the next source if the preferred one fails.
diff --git a/rust/src/locale/es-MX.ftl b/rust/src/locale/es-MX.ftl
index 044c7a9bb6..f52199c132 100644
--- a/rust/src/locale/es-MX.ftl
+++ b/rust/src/locale/es-MX.ftl
@@ -282,6 +282,19 @@ ProviderClaudeDailyRoutinesUsage = Mostrar uso de Daily Routines
 ProviderClaudeDailyRoutinesUsageHelp = Muestra la fila de cuota Daily Routines en el uso web/OAuth de Claude.
 ProviderCodexSparkUsage = Show Codex Spark usage
 ProviderCodexSparkUsageHelp = Show Codex Spark quota rows without hiding credits or other extra usage.
+CodexAccountsTitle = Cuentas de Codex
+CodexAccountsHint = Administra varias cuentas de Codex. Cada cuenta vive en su propio hogar administrado; al cambiar se actualiza la identidad activa.
+CodexAccountsAddButton = Añadir cuenta
+CodexAccountsSwitchButton = Cambiar
+CodexAccountsFetchButton = Actualizar uso
+CodexAccountsRemoveButton = Quitar
+CodexAccountsEmpty = No se encontraron cuentas de Codex.
+CodexAccountsSourceAmbient = Ambiental
+CodexAccountsSourceManaged = Administrada
+CodexAccountsUsageUnavailable = Sin datos de uso
+CodexSwitchSuccess = Cuenta activa cambiada.
+CodexSwitchRestartPrompt = ¿Reiniciar Codex Desktop para cargar la sesión restaurada?
+CodexAccountsRestartDesktop = Reiniciar Codex Desktop
 ProviderCursorCookieSourceHelp = Importa automáticamente cookies del navegador o sesiones almacenadas.
 ProviderCursorCreditsHelp = Uso bajo demanda más allá de los límites del plan incluido.
 AutoFallbackHelp = Auto recurre a la siguiente fuente si la preferida falla.