Fix master agent model switch availability copy

src/lib/boss-master-agent.ts

@@ -1972,6 +1972,12 @@ async function tryHandleMasterAgentModelCommand(params: {
   }
   const visibleModels = context.visibleModels;
   const usableModels = context.usableModels;
+  const availableModelsSuffix =
+    usableModels.length > 0
+      ? `当前已就绪模型：${usableModels.join("、")}。`
+      : visibleModels.length > 0
+        ? `已登记/可选模型：${visibleModels.join("、")}。`
+        : "暂时还没有可展示的模型清单。";
 
   if (isModelListRequest(params.requestText) && !isModelSwitchRequest(params.requestText)) {
     const configuredSummary = visibleModels.length > 0 ? visibleModels.join("、") : "暂时还没有";
@@ -1985,12 +1991,12 @@ async function tryHandleMasterAgentModelCommand(params: {
 
   const requestedModel = detectRequestedModelName(params.requestText, visibleModels);
   if (!requestedModel) {
-    const reply = `我收到的是模型切换请求，但没有识别到具体模型名。当前可用模型：${usableModels.length > 0 ? usableModels.join("、") : "暂无"}。`;
+    const reply = `我收到的是模型切换请求，但没有识别到具体模型名。${availableModelsSuffix}`;
     return appendFastPathError(reply, "MODEL_NAME_REQUIRED", buildMasterAgentModelSenderLabel(context.effectiveChatPolicy.model));
   }
 
   if (!visibleModels.includes(requestedModel)) {
-    const reply = `我没找到可切换到的模型 ${requestedModel}。当前可用模型：${usableModels.length > 0 ? usableModels.join("、") : "暂无"}；已登记/可选模型：${visibleModels.join("、")}。`;
+    const reply = `我没找到可切换到的模型 ${requestedModel}。${availableModelsSuffix}`;
     return appendFastPathError(reply, "MODEL_NOT_AVAILABLE", buildMasterAgentModelSenderLabel(context.effectiveChatPolicy.model));
   }
 
@@ -2005,7 +2011,7 @@ async function tryHandleMasterAgentModelCommand(params: {
         : { modelOverride: requestedModel };
 
   await updateProjectAgentControls("master-agent", patch, params.requestedByAccount);
-  const reply = `已把主 Agent 的${scopeLabel}切到 ${requestedModel}。当前可用模型：${usableModels.length > 0 ? usableModels.join("、") : "暂无"}。`;
+  const reply = `已把主 Agent 的${scopeLabel}切到 ${requestedModel}。${availableModelsSuffix}`;
   return appendFastPathReply(reply, buildMasterAgentModelSenderLabel(requestedModel));
 }
 

tests/master-agent-message-queue.test.ts

@@ -176,6 +176,50 @@ test("master-agent 明确要求切快模型时直接更新 controls 并返回完
   assert.equal(reply?.senderLabel ?? "", "主Agent·gpt-5.4-mini");
 });
 
+test("master-agent 切换模型成功时不会因为当前在线账号为空就回报可用模型暂无", async () => {
+  await saveAiAccount({
+    accountId: "master-codex-offline-switch",
+    label: "主 GPT",
+    role: "primary",
+    provider: "master_codex_node",
+    displayName: "Mac 上的 Master Codex Node",
+    nodeId: "offline-master-node",
+    nodeLabel: "离线 Codex",
+    model: "gpt-5.4",
+    enabled: true,
+    setActive: true,
+    loginStatusNote: "用于离线主节点模型切换文案测试。",
+  });
+
+  const response = await POST(
+    await createAuthedRequest("master-agent", {
+      body: "把主agent模型换成gpt5.4-mini",
+    }),
+    { params: Promise.resolve({ projectId: "master-agent" }) },
+  );
+
+  assert.equal(response.status, 200);
+  const payload = (await response.json()) as {
+    ok: boolean;
+    task?: { taskId: string } | null;
+    masterReplyState?: "queued" | "running" | "completed" | null;
+  };
+  assert.equal(payload.ok, true);
+  assert.equal(payload.task ?? null, null);
+  assert.equal(payload.masterReplyState, "completed");
+
+  const controls = await getProjectAgentControls("master-agent", "17600003315");
+  assert.equal(controls?.modelOverride ?? null, "gpt-5.4-mini");
+
+  const state = await readState();
+  const masterProject = state.projects.find((project) => project.id === "master-agent");
+  const reply = masterProject?.messages.at(-1);
+  assert.ok(reply, "expected the master-agent offline switch reply to be persisted");
+  assert.match(reply?.body ?? "", /已把主 Agent 的当前主模型切到 gpt-5\.4-mini/);
+  assert.doesNotMatch(reply?.body ?? "", /当前可用模型：暂无/);
+  assert.match(reply?.body ?? "", /已登记\/可选模型：/);
+});
+
 test("master-agent 识别自然写法的模型名并切当前主模型", async () => {
   await saveAiAccount({
     accountId: "openai-main-switch",