diff --git a/core/internal/buildinfo/buildinfo.go b/core/internal/buildinfo/buildinfo.go
index f60bc3c4..54c2dfdd 100644
--- a/core/internal/buildinfo/buildinfo.go
+++ b/core/internal/buildinfo/buildinfo.go
@@ -4,7 +4,7 @@ import "strings"
 
 // Set at link time via -ldflags (see .goreleaser.yaml).
 var (
-	Version = "dev0.1.42"
+	Version = "dev0.1.43"
 	Commit  = "none"
 	Date    = "unknown"
 )
diff --git a/electron/clovapi-desktop.js b/electron/clovapi-desktop.js
index c73e3f8e..e685dbee 100644
--- a/electron/clovapi-desktop.js
+++ b/electron/clovapi-desktop.js
@@ -64,6 +64,29 @@ function saveProfiles(payload) {
   });
 }
 
+async function switchProviderModel(cliKind, providerId, modelId) {
+  const result = await runClovapiArgsAsync(
+    [
+      "switch",
+      "--cli",
+      String(cliKind || ""),
+      "--provider",
+      String(providerId || ""),
+      "--model",
+      String(modelId || ""),
+    ],
+    { timeout: 45000 },
+  );
+  if (result.error && result.error.code === "ETIMEDOUT") {
+    return { ok: false, error: "clovapi switch timed out" };
+  }
+  if (!result.ok) {
+    const message = String(result.stderr || result.stdout || "clovapi switch failed").trim();
+    return { ok: false, error: message || "clovapi switch failed" };
+  }
+  return { ok: true, stdout: result.stdout, stderr: result.stderr };
+}
+
 function listVendorModels(vendorName) {
   return runDesktop(["vendor", "list-models", "--vendor", String(vendorName || "")], {
     timeout: 45000,
@@ -122,6 +145,7 @@ module.exports = {
   loadProxyConfig,
   saveProxyConfig,
   saveProfiles,
+  switchProviderModel,
   listVendorModels,
   testBinding,
   modelAdapters,
diff --git a/electron/main.js b/electron/main.js
index 82d6da08..6ad7c4fd 100644
--- a/electron/main.js
+++ b/electron/main.js
@@ -6,6 +6,7 @@ const { createGoProxyManager } = require("./proxy-manager");
 const proxyLogger = require("./proxy-logger");
 const callLogsStore = require("./call-logs-store");
 const clovapiDesktop = require("./clovapi-desktop");
+const { applyTrayModelSwitch } = require("./tray-model-switch");
 const {
   coreDevStatePath,
   resolveClovapiExecutable: resolveBundledClovapiExecutable,
@@ -232,31 +233,15 @@ async function readTrayDesktopState() {
 }
 
 async function switchTrayAgentModel(cliKind, providerId, modelId) {
-  const kind = String(cliKind || "").trim();
-  const provider = String(providerId || "").trim();
-  const model = String(modelId || "").trim();
-  if (!kind || !provider || !model) return;
-
-  const loaded = await clovapiDesktop.loadProfiles();
-  if (!loaded?.ok) {
-    emitOutput("stderr", `[tray] failed to load profiles: ${loaded?.error || "unknown error"}\n`);
-    return;
-  }
-
-  const active = loaded.active && typeof loaded.active === "object" ? { ...loaded.active } : {};
-  active[kind] = { provider_id: provider, model_id: model };
-  const saved = await clovapiDesktop.saveProfiles({
-    profiles: Array.isArray(loaded.profiles) ? loaded.profiles : [],
-    active,
-    proxy: loaded.proxy,
+  await applyTrayModelSwitch({
+    desktop: clovapiDesktop,
+    cliKind,
+    providerId,
+    modelId,
+    emitOutput,
+    dispatchRendererEvent,
+    updateTrayMenu,
   });
-  if (!saved?.ok) {
-    emitOutput("stderr", `[tray] failed to switch ${kind} model: ${saved?.error || "unknown error"}\n`);
-    return;
-  }
-
-  dispatchRendererEvent({ type: "profiles-changed" });
-  await updateTrayMenu();
 }
 
 async function updateTrayMenu() {
diff --git a/electron/package.json b/electron/package.json
index 51a867d1..7d1d8285 100644
--- a/electron/package.json
+++ b/electron/package.json
@@ -13,7 +13,7 @@
     "build:icons": "node scripts/build-icons.mjs",
     "build:mac": "npm run build:ui && npm run build:icons && electron-builder --mac dmg",
     "build:win": "npm run build:ui && electron-builder --win nsis",
-    "test": "node --test proxy-manager.test.js clovapi-exec.test.js tray-menu.test.js desktop-update.test.js",
+    "test": "node --test proxy-manager.test.js clovapi-exec.test.js tray-menu.test.js tray-model-switch.test.js desktop-update.test.js",
     "start": "npm run build:ui && electron ."
   },
   "devDependencies": {
diff --git a/electron/proxy-manager.js b/electron/proxy-manager.js
index 150e5932..b6db66ab 100644
--- a/electron/proxy-manager.js
+++ b/electron/proxy-manager.js
@@ -617,6 +617,7 @@ module.exports = {
   buildProxyStopArgs,
   normalizeBindHost,
   healthClientHost,
+  reachableLoopbackHost,
   healthUrl,
   redactSecrets,
   createGoProxyManager,
diff --git a/electron/tray-model-switch.js b/electron/tray-model-switch.js
new file mode 100644
index 00000000..3c7aaf59
--- /dev/null
+++ b/electron/tray-model-switch.js
@@ -0,0 +1,32 @@
+async function applyTrayModelSwitch(options = {}) {
+  const desktop = options.desktop;
+  const emitOutput = typeof options.emitOutput === "function" ? options.emitOutput : () => {};
+  const dispatchRendererEvent =
+    typeof options.dispatchRendererEvent === "function" ? options.dispatchRendererEvent : () => {};
+  const updateTrayMenu = typeof options.updateTrayMenu === "function" ? options.updateTrayMenu : async () => {};
+
+  const kind = String(options.cliKind || "").trim();
+  const provider = String(options.providerId || "").trim();
+  const model = String(options.modelId || "").trim();
+  if (!kind || !provider || !model) return { ok: false, skipped: true };
+  if (!desktop || typeof desktop.switchProviderModel !== "function") {
+    emitOutput("stderr", `[tray] failed to switch ${kind} model: clovapi switch is unavailable\n`);
+    return { ok: false, error: "clovapi switch is unavailable" };
+  }
+
+  const result = await desktop.switchProviderModel(kind, provider, model);
+  if (!result?.ok) {
+    const error = String(result?.error || "unknown error").trim() || "unknown error";
+    emitOutput("stderr", `[tray] failed to switch ${kind} model: ${error}\n`);
+    await updateTrayMenu();
+    return { ok: false, error };
+  }
+
+  dispatchRendererEvent({ type: "profiles-changed" });
+  await updateTrayMenu();
+  return { ok: true };
+}
+
+module.exports = {
+  applyTrayModelSwitch,
+};
diff --git a/electron/tray-model-switch.test.js b/electron/tray-model-switch.test.js
new file mode 100644
index 00000000..91d5545b
--- /dev/null
+++ b/electron/tray-model-switch.test.js
@@ -0,0 +1,60 @@
+const assert = require("node:assert/strict");
+const test = require("node:test");
+const { applyTrayModelSwitch } = require("./tray-model-switch");
+
+test("applyTrayModelSwitch delegates tray selections to clovapi switch", async () => {
+  const calls = [];
+  const result = await applyTrayModelSwitch({
+    desktop: {
+      async switchProviderModel(cliKind, providerId, modelId) {
+        calls.push({ cliKind, providerId, modelId });
+        return { ok: true };
+      },
+      async saveProfiles() {
+        throw new Error("tray switch must not save profiles directly");
+      },
+    },
+    cliKind: "codex",
+    providerId: "custom-api",
+    modelId: "gpt-5.5",
+    dispatchRendererEvent(payload) {
+      calls.push({ event: payload });
+    },
+    async updateTrayMenu() {
+      calls.push({ updateTrayMenu: true });
+    },
+  });
+
+  assert.equal(result.ok, true);
+  assert.deepEqual(calls, [
+    { cliKind: "codex", providerId: "custom-api", modelId: "gpt-5.5" },
+    { event: { type: "profiles-changed" } },
+    { updateTrayMenu: true },
+  ]);
+});
+
+test("applyTrayModelSwitch reports switch failures without profile change events", async () => {
+  const errors = [];
+  const events = [];
+  const result = await applyTrayModelSwitch({
+    desktop: {
+      async switchProviderModel() {
+        return { ok: false, error: "write failed" };
+      },
+    },
+    cliKind: "hermes",
+    providerId: "custom-api",
+    modelId: "claude-sonnet",
+    emitOutput(stream, message) {
+      errors.push({ stream, message });
+    },
+    dispatchRendererEvent(payload) {
+      events.push(payload);
+    },
+  });
+
+  assert.equal(result.ok, false);
+  assert.equal(result.error, "write failed");
+  assert.deepEqual(events, []);
+  assert.deepEqual(errors, [{ stream: "stderr", message: "[tray] failed to switch hermes model: write failed\n" }]);
+});