diff --git a/src/hooks/useImportExport.ts b/src/hooks/useImportExport.ts
index 9ee568d..eb56943 100644
--- a/src/hooks/useImportExport.ts
+++ b/src/hooks/useImportExport.ts
@@ -2,6 +2,7 @@ import { useCallback, useEffect, useRef, useState } from "react";
 import { useTranslation } from "react-i18next";
 import { toast } from "sonner";
 import { settingsApi } from "@/lib/api";
+import { syncCurrentProvidersLiveSafe } from "@/utils/postChangeSync";
 
 export type ImportStatus =
   | "idle"
@@ -105,8 +106,8 @@ export function useImportExport(
 
       setBackupId(result.backupId ?? null);
 
-      try {
-        await settingsApi.syncCurrentProvidersLive();
+      const syncResult = await syncCurrentProvidersLiveSafe();
+      if (syncResult.ok) {
         setStatus("success");
         toast.success(
           t("settings.importSuccess", {
@@ -117,8 +118,11 @@ export function useImportExport(
         successTimerRef.current = window.setTimeout(() => {
           void onImportSuccess?.();
         }, 1500);
-      } catch (error) {
-        console.error("[useImportExport] Failed to sync live config", error);
+      } else {
+        console.error(
+          "[useImportExport] Failed to sync live config",
+          syncResult.error,
+        );
         setStatus("partial-success");
         toast.warning(
           t("settings.importPartialSuccess", {
diff --git a/src/hooks/useSettings.ts b/src/hooks/useSettings.ts
index c02a442..0f29e0a 100644
--- a/src/hooks/useSettings.ts
+++ b/src/hooks/useSettings.ts
@@ -2,6 +2,7 @@ import { useCallback, useMemo } from "react";
 import { useTranslation } from "react-i18next";
 import { toast } from "sonner";
 import { providersApi, settingsApi, type AppId } from "@/lib/api";
+import { syncCurrentProvidersLiveSafe } from "@/utils/postChangeSync";
 import { useSettingsQuery, useSaveSettingsMutation } from "@/lib/query";
 import type { Settings } from "@/types";
 import { useSettingsForm, type SettingsFormState } from "./useSettingsForm";
@@ -120,6 +121,8 @@ export function useSettings(): UseSettingsResult {
       const sanitizedClaudeDir = sanitizeDir(settings.claudeConfigDir);
       const sanitizedCodexDir = sanitizeDir(settings.codexConfigDir);
       const previousAppDir = initialAppConfigDir;
+      const previousClaudeDir = sanitizeDir(data?.claudeConfigDir);
+      const previousCodexDir = sanitizeDir(data?.codexConfigDir);
 
       const payload: Settings = {
         ...settings,
@@ -167,6 +170,19 @@ export function useSettings(): UseSettingsResult {
         console.warn("[useSettings] Failed to refresh tray menu", error);
       }
 
+      // 如果 Claude/Codex 的目录覆盖发生变化，则立即将“当前使用的供应商”写回对应应用的 live 配置
+      const claudeDirChanged = sanitizedClaudeDir !== previousClaudeDir;
+      const codexDirChanged = sanitizedCodexDir !== previousCodexDir;
+      if (claudeDirChanged || codexDirChanged) {
+        const syncResult = await syncCurrentProvidersLiveSafe();
+        if (!syncResult.ok) {
+          console.warn(
+            "[useSettings] Failed to sync current providers after directory change",
+            syncResult.error,
+          );
+        }
+      }
+
       const appDirChanged = sanitizedAppDir !== (previousAppDir ?? undefined);
       setRequiresRestart(appDirChanged);
 
@@ -177,6 +193,7 @@ export function useSettings(): UseSettingsResult {
     }
   }, [
     appConfigDir,
+    data,
     initialAppConfigDir,
     saveMutation,
     settings,
diff --git a/src/utils/postChangeSync.ts b/src/utils/postChangeSync.ts
new file mode 100644
index 0000000..ed8c1d9
--- /dev/null
+++ b/src/utils/postChangeSync.ts
@@ -0,0 +1,19 @@
+import { settingsApi } from "@/lib/api";
+
+/**
+ * 统一的“后置同步”工具：将当前使用的供应商写回对应应用的 live 配置。
+ * 不抛出异常，由调用方根据返回值决定提示策略。
+ */
+export async function syncCurrentProvidersLiveSafe(): Promise<{
+  ok: boolean;
+  error?: Error;
+}> {
+  try {
+    await settingsApi.syncCurrentProvidersLive();
+    return { ok: true };
+  } catch (err) {
+    const error = err instanceof Error ? err : new Error(String(err ?? ""));
+    return { ok: false, error };
+  }
+}
+
diff --git a/tests/hooks/useSettings.test.tsx b/tests/hooks/useSettings.test.tsx
index da91602..053a019 100644
--- a/tests/hooks/useSettings.test.tsx
+++ b/tests/hooks/useSettings.test.tsx
@@ -7,6 +7,7 @@ const mutateAsyncMock = vi.fn();
 const useSettingsQueryMock = vi.fn();
 const setAppConfigDirOverrideMock = vi.fn();
 const applyClaudePluginConfigMock = vi.fn();
+const syncCurrentProvidersLiveMock = vi.fn();
 const toastErrorMock = vi.fn();
 const toastSuccessMock = vi.fn();
 
@@ -48,6 +49,8 @@ vi.mock("@/lib/api", () => ({
       setAppConfigDirOverrideMock(...args),
     applyClaudePluginConfig: (...args: unknown[]) =>
       applyClaudePluginConfigMock(...args),
+    syncCurrentProvidersLive: (...args: unknown[]) =>
+      syncCurrentProvidersLiveMock(...args),
   },
 }));
 
@@ -102,6 +105,7 @@ describe("useSettings hook", () => {
     useSettingsQueryMock.mockReset();
     setAppConfigDirOverrideMock.mockReset();
     applyClaudePluginConfigMock.mockReset();
+    syncCurrentProvidersLiveMock.mockReset();
     toastErrorMock.mockReset();
     toastSuccessMock.mockReset();
     window.localStorage.clear();
@@ -181,6 +185,8 @@ describe("useSettings hook", () => {
     expect(metadataMock.setRequiresRestart).toHaveBeenCalledWith(true);
     expect(window.localStorage.getItem("language")).toBe("en");
     expect(toastErrorMock).not.toHaveBeenCalled();
+    // 目录有变化，应触发一次同步当前供应商到 live
+    expect(syncCurrentProvidersLiveMock).toHaveBeenCalledTimes(1);
   });
 
   it("saves settings without restart when directory unchanged", async () => {
@@ -209,6 +215,8 @@ describe("useSettings hook", () => {
     expect(setAppConfigDirOverrideMock).toHaveBeenCalledWith(null);
     expect(applyClaudePluginConfigMock).toHaveBeenCalledWith({ official: true });
     expect(metadataMock.setRequiresRestart).toHaveBeenCalledWith(false);
+    // 目录未变化，不应触发同步
+    expect(syncCurrentProvidersLiveMock).not.toHaveBeenCalled();
   });
 
   it("shows toast when Claude plugin sync fails but continues flow", async () => {