diff --git a/frontend/src/components/ModelPicker.tsx b/frontend/src/components/ModelPicker.tsx
index efe54d8..e3f41b7 100644
--- a/frontend/src/components/ModelPicker.tsx
+++ b/frontend/src/components/ModelPicker.tsx
@@ -1,5 +1,5 @@
 import { Check, Search } from "lucide-react";
-import { useMemo, useState } from "react";
+import { useMemo } from "react";
 
 import { useI18n } from "../i18n";
 
@@ -7,50 +7,52 @@ interface ModelPickerProps {
   models: string[];
   value: string;
   onChange: (value: string) => void;
+  inputId?: string;
+  inputLabel?: string;
+  required?: boolean;
 }
 
-export function ModelPicker({ models, value, onChange }: ModelPickerProps) {
+export function ModelPicker({ models, value, onChange, inputId = "manual-model", inputLabel, required }: ModelPickerProps) {
   const { t } = useI18n();
-  const [query, setQuery] = useState("");
   const filtered = useMemo(
-    () => models.filter((model) => model.toLocaleLowerCase().includes(query.trim().toLocaleLowerCase())),
-    [models, query],
+    () => models.filter((model) => model.toLocaleLowerCase().includes(value.trim().toLocaleLowerCase())),
+    [models, value],
   );
 
   return (
     <div className="model-picker">
-      {models.length ? (
-        <>
+      <div className="field-stack manual-model-field">
+        <label htmlFor={inputId}>{inputLabel || t("手动输入模型 ID")}</label>
+        {models.length ? (
           <div className="search-field">
             <Search size={17} />
-            <input value={query} onChange={(event) => setQuery(event.target.value)} placeholder={t("搜索模型")} aria-label={t("搜索模型")} />
+            <input id={inputId} value={value} onChange={(event) => onChange(event.target.value)} placeholder={t("搜索模型")} aria-label={inputLabel || t("搜索模型")} required={required} />
           </div>
-          <div className="model-list" role="radiogroup" aria-label={t("模型列表")}>
-            {filtered.map((model) => (
-              <button
-                type="button"
-                role="radio"
-                aria-checked={model === value}
-                className={`model-row${model === value ? " is-selected" : ""}`}
-                key={model}
-                onClick={() => onChange(model)}
-              >
-                <span>
-                  <strong>{model}</strong>
-                  <small>OpenAI-compatible model</small>
-                </span>
-                {model === value ? <Check size={17} /> : null}
-              </button>
-            ))}
-            {!filtered.length ? <div className="empty-row">{t("没有匹配的模型")}</div> : null}
-          </div>
-        </>
-      ) : null}
-
-      <div className="field-stack manual-model-field">
-        <label htmlFor="manual-model">{models.length ? t("或手动输入模型 ID") : t("手动输入模型 ID")}</label>
-        <input id="manual-model" className="text-field" value={value} onChange={(event) => onChange(event.target.value)} placeholder={t("例如 gpt-4.1")} />
+        ) : (
+          <input id={inputId} className="text-field" value={value} onChange={(event) => onChange(event.target.value)} placeholder={t("例如 gpt-4.1")} required={required} />
+        )}
       </div>
+      {models.length ? (
+        <div className="model-list" role="radiogroup" aria-label={t("模型列表")}>
+          {filtered.map((model) => (
+            <button
+              type="button"
+              role="radio"
+              aria-checked={model === value}
+              className={`model-row${model === value ? " is-selected" : ""}`}
+              key={model}
+              onClick={() => onChange(model)}
+            >
+              <span>
+                <strong>{model}</strong>
+                <small>OpenAI-compatible model</small>
+              </span>
+              {model === value ? <Check size={17} /> : null}
+            </button>
+          ))}
+          {!filtered.length ? <div className="empty-row">{t("没有匹配的模型")}</div> : null}
+        </div>
+      ) : null}
     </div>
   );
 }
diff --git a/frontend/src/components/ProviderModelPicker.tsx b/frontend/src/components/ProviderModelPicker.tsx
new file mode 100644
index 0000000..26691df
--- /dev/null
+++ b/frontend/src/components/ProviderModelPicker.tsx
@@ -0,0 +1,51 @@
+import { useEffect, useState } from "react";
+
+import { api, describeError } from "../backend/api";
+import { useI18n } from "../i18n";
+import { ModelPicker } from "./ModelPicker";
+
+interface ProviderModelPickerProps {
+  provider: string;
+  protocol: string;
+  hasKey: boolean;
+  value: string;
+  onChange: (value: string) => void;
+  inputId: string;
+}
+
+export function ProviderModelPicker({ provider, protocol, hasKey, value, onChange, inputId }: ProviderModelPickerProps) {
+  const { t } = useI18n();
+  const [models, setModels] = useState<string[]>([]);
+  const [loading, setLoading] = useState(false);
+  const [message, setMessage] = useState("");
+  const [success, setSuccess] = useState(false);
+
+  useEffect(() => {
+    if (!protocol || !hasKey) return;
+    let cancelled = false;
+    setLoading(true);
+    setMessage("");
+    void api.models({ provider, apiBaseUrl: "", apiKey: "" }).then((result) => {
+      if (cancelled) return;
+      setModels(result.models ?? []);
+      setSuccess(result.ok);
+      setMessage(result.message.replace(/^Found (\d+) models\.$/, (_, count: string) => t("找到 {count} 个模型", { count })));
+    }).catch((error) => {
+      if (cancelled) return;
+      setModels([]);
+      setSuccess(false);
+      setMessage(describeError(error, t("无法获取模型列表")).message);
+    }).finally(() => {
+      if (!cancelled) setLoading(false);
+    });
+    return () => { cancelled = true; };
+  }, [hasKey, protocol, provider, t]);
+
+  return (
+    <div className="field-stack profile-editor-wide">
+      {loading ? <div className="loading-block"><span className="spinner" />{t("正在读取模型列表")}</div> : null}
+      {message && !loading ? <div className={`notice ${success ? "notice-success" : "notice-warning"}`}>{message}</div> : null}
+      <ModelPicker models={models} value={value} onChange={onChange} inputId={inputId} inputLabel={t("模型")} required />
+    </div>
+  );
+}
diff --git a/frontend/src/pages/AgentProfilePage.tsx b/frontend/src/pages/AgentProfilePage.tsx
index 8a0fa85..206505a 100644
--- a/frontend/src/pages/AgentProfilePage.tsx
+++ b/frontend/src/pages/AgentProfilePage.tsx
@@ -4,6 +4,7 @@ import { useNavigate, useParams } from "react-router-dom";
 
 import { api, describeError } from "../backend/api";
 import { PageScaffold } from "../components/PageScaffold";
+import { ProviderModelPicker } from "../components/ProviderModelPicker";
 import { ProviderSegment } from "../components/ProviderSegment";
 import { useI18n } from "../i18n";
 import { desktopApps, desktopProfileUsable, desktopProfiles, desktopProtocol, profileAgentIdForDesktop } from "../state/desktopSetup";
@@ -210,10 +211,15 @@ export function AgentProfilePage() {
                 protocol={protocol}
               />
             </div>
-            <div className="field-stack profile-editor-wide">
-              <label htmlFor="agent-profile-model">{t("模型")}</label>
-              <input id="agent-profile-model" value={draft.model} onChange={(event) => setDraft({ ...draft, model: event.target.value })} placeholder={t("例如 deepseek/deepseek-v4-pro")} required />
-            </div>
+            <ProviderModelPicker
+              key={`${protocol}:${draft.provider}`}
+              provider={draft.provider}
+              protocol={protocol}
+              hasKey={Boolean(status.providers[draft.provider]?.has_key)}
+              value={draft.model}
+              onChange={(model) => setDraft({ ...draft, model })}
+              inputId="agent-profile-model"
+            />
           </div>
           <p className="profile-key-hint">
             {status.providers[draft.provider]?.has_key
diff --git a/frontend/src/pages/AgentSelectionPage.tsx b/frontend/src/pages/AgentSelectionPage.tsx
index 041d86a..48e4bf1 100644
--- a/frontend/src/pages/AgentSelectionPage.tsx
+++ b/frontend/src/pages/AgentSelectionPage.tsx
@@ -6,12 +6,12 @@ import { AgentRow } from "../components/AgentRow";
 import { MirrorSetting } from "../components/MirrorSetting";
 import { PageScaffold } from "../components/PageScaffold";
 import { RuntimePrompt } from "../components/RuntimePrompt";
+import { StatusBadge } from "../components/StatusBadge";
 import { useI18n } from "../i18n";
-import { byRank } from "../state/ranking";
 import { desktopApps, desktopProtocol } from "../state/desktopSetup";
+import { byRank } from "../state/ranking";
 import { useWizard } from "../state/WizardContext";
 import type { AgentCatalogItem } from "../types/api";
-import { StatusBadge } from "../components/StatusBadge";
 
 export function AgentSelectionPage() {
   const navigate = useNavigate();
@@ -75,8 +75,8 @@ export function AgentSelectionPage() {
               <PackageCheck size={19} aria-hidden="true" />
             </div>
             <div className="agent-tabs" role="tablist" aria-label={t("Agent 类型")}>
-              <button className={`agent-tab${state.setupKind !== "desktop" ? " is-active" : ""}`} role="tab" aria-selected={state.setupKind !== "desktop"} type="button" onClick={() => dispatch({ type: "START_SETUP" })}>{t("命令行 Agent")}</button>
               <button className={`agent-tab${state.setupKind === "desktop" ? " is-active" : ""}`} role="tab" aria-selected={state.setupKind === "desktop"} type="button" onClick={() => dispatch({ type: "START_DESKTOP_SETUP" })}>{t("桌面 Agent")}</button>
+              <button className={`agent-tab${state.setupKind !== "desktop" ? " is-active" : ""}`} role="tab" aria-selected={state.setupKind !== "desktop"} type="button" onClick={() => dispatch({ type: "START_SETUP" })}>{t("命令行 Agent")}</button>
             </div>
             {state.setupKind !== "desktop" ? renderRows(agents) : (
               <div className="agent-list agent-selection-list">
diff --git a/frontend/src/pages/EnvironmentOverviewPage.test.tsx b/frontend/src/pages/EnvironmentOverviewPage.test.tsx
index 1b1f284..3861c7b 100644
--- a/frontend/src/pages/EnvironmentOverviewPage.test.tsx
+++ b/frontend/src/pages/EnvironmentOverviewPage.test.tsx
@@ -117,7 +117,7 @@ describe("EnvironmentOverviewPage", () => {
     fireEvent.click(screen.getByRole("button", { name: "安装 Agent" }));
     expect(await screen.findByRole("heading", { name: "onboarding" })).toBeTruthy();
     // A second run must not inherit the previous Agent, model or log.
-    expect(dispatch).toHaveBeenCalledWith({ type: "START_SETUP" });
+    expect(dispatch).toHaveBeenCalledWith({ type: "START_DESKTOP_SETUP" });
   });
 
   it("counts and shows only installed desktop Agents", async () => {
@@ -139,7 +139,7 @@ describe("EnvironmentOverviewPage", () => {
     expect(screen.getAllByRole("button", { name: "安装 Agent" })).toHaveLength(1);
 
     fireEvent.click(screen.getByRole("button", { name: "安装 Agent" }));
-    expect(dispatch).toHaveBeenCalledWith({ type: "START_SETUP" });
+    expect(dispatch).toHaveBeenCalledWith({ type: "START_DESKTOP_SETUP" });
     expect(dispatch).not.toHaveBeenCalledWith(expect.objectContaining({ type: "SELECT_AGENT" }));
     expect(await screen.findByRole("heading", { name: "onboarding" })).toBeTruthy();
   });
diff --git a/frontend/src/pages/EnvironmentOverviewPage.tsx b/frontend/src/pages/EnvironmentOverviewPage.tsx
index 6cb349c..6501eab 100644
--- a/frontend/src/pages/EnvironmentOverviewPage.tsx
+++ b/frontend/src/pages/EnvironmentOverviewPage.tsx
@@ -21,7 +21,7 @@ export function EnvironmentOverviewPage() {
     if (agentId) navigate(`/agents/${agentId}`);
   };
   const openInstall = () => {
-    dispatch({ type: "START_SETUP" });
+    dispatch({ type: "START_DESKTOP_SETUP" });
     navigate("/setup/agents");
   };
 
diff --git a/frontend/src/pages/ProfilesPage.test.tsx b/frontend/src/pages/ProfilesPage.test.tsx
index b12618a..61bc20f 100644
--- a/frontend/src/pages/ProfilesPage.test.tsx
+++ b/frontend/src/pages/ProfilesPage.test.tsx
@@ -308,6 +308,30 @@ describe("ProfilesPage", () => {
     expect(screen.getByLabelText("模型")).toHaveValue("");
   });
 
+  it("discovers and searches the selected Provider's models", async () => {
+    const models = vi.spyOn(api, "models").mockResolvedValue({
+      ok: true,
+      reachable: true,
+      status: 200,
+      message: "Found 2 models.",
+      error_code: null,
+      retryable: false,
+      models: ["model-alpha", "model-beta"],
+    });
+    mockState = { status: statusWith([]), statusState: "success" };
+    if (!mockState.status) throw new Error("missing status");
+    mockState.status.providers.ppio.has_key = true;
+    render(<MemoryRouter><ProfilesPage /></MemoryRouter>);
+    fireEvent.click(screen.getByRole("button", { name: "新增 Profile" }));
+    fireEvent.click(screen.getByRole("combobox", { name: "API 类型" }));
+    fireEvent.click(screen.getByRole("option", { name: "OpenAI Responses" }));
+    await waitFor(() => expect(models).toHaveBeenCalledWith({ provider: "ppio", apiBaseUrl: "", apiKey: "" }));
+    expect(screen.getByText("model-alpha")).toBeTruthy();
+    fireEvent.change(screen.getByLabelText("模型"), { target: { value: "beta" } });
+    expect(screen.queryByText("model-alpha")).toBeNull();
+    expect(screen.getByText("model-beta")).toBeTruthy();
+  });
+
   it("applies one Profile to all of its Agents", async () => {
     const activate = vi.spyOn(api, "activateAgent").mockResolvedValue({
       ok: true,
diff --git a/frontend/src/pages/ProfilesPage.tsx b/frontend/src/pages/ProfilesPage.tsx
index ee7d2ae..a2dc857 100644
--- a/frontend/src/pages/ProfilesPage.tsx
+++ b/frontend/src/pages/ProfilesPage.tsx
@@ -4,6 +4,7 @@ import { useNavigate } from "react-router-dom";
 
 import { api, describeError, isCancellationError } from "../backend/api";
 import { PageScaffold } from "../components/PageScaffold";
+import { ProviderModelPicker } from "../components/ProviderModelPicker";
 import { ProviderSegment } from "../components/ProviderSegment";
 import { SelectField } from "../components/SelectField";
 import { useI18n } from "../i18n";
@@ -283,10 +284,15 @@ export function ProfilesPage() {
                 protocol={editor.protocol as ProtocolId}
               />
             </div>
-            <div className="field-stack profile-editor-wide">
-              <label htmlFor="profile-model">{t("模型")}</label>
-              <input id="profile-model" value={editor.model} onChange={(event) => setEditor({ ...editor, model: event.target.value })} placeholder={t("例如 deepseek/deepseek-v4-pro")} required />
-            </div>
+            <ProviderModelPicker
+              key={`${editor.protocol}:${editor.provider}`}
+              provider={editor.provider}
+              protocol={editor.protocol}
+              hasKey={providerHasKey}
+              value={editor.model}
+              onChange={(model) => setEditor({ ...editor, model })}
+              inputId="profile-model"
+            />
             {/* The key is the Provider's, so this only reports whether that
                 Provider has one and links to where it is set. */}
             <p className="profile-key-hint profile-editor-wide">
diff --git a/frontend/src/state/desktopSetup.ts b/frontend/src/state/desktopSetup.ts
index 66a4263..8de43e6 100644
--- a/frontend/src/state/desktopSetup.ts
+++ b/frontend/src/state/desktopSetup.ts
@@ -2,7 +2,7 @@ import type { DesktopAgentStatus, ProfileSummary, StatusResponse } from "../type
 
 export function desktopApps(status: StatusResponse): DesktopAgentStatus[] {
   const seen = new Set<string>();
-  return status.desktopAgents.filter((app) => {
+  return (status.desktopAgents ?? []).filter((app) => {
     if (!app?.id || seen.has(app.id)) return false;
     seen.add(app.id);
     return true;
diff --git a/frontend/src/state/wizardReducer.test.ts b/frontend/src/state/wizardReducer.test.ts
index 34faf53..36a1050 100644
--- a/frontend/src/state/wizardReducer.test.ts
+++ b/frontend/src/state/wizardReducer.test.ts
@@ -33,6 +33,10 @@ const successProbe = {
 } satisfies ProbeResponse;
 
 describe("wizardReducer", () => {
+  it("defaults Agent selection to desktop", () => {
+    expect(initialWizardState.setupKind).toBe("desktop");
+  });
+
   it("loads status and reports status errors", () => {
     let state = wizardReducer(initialWizardState, { type: "STATUS_LOADING" });
     expect(state.statusState).toBe("loading");
diff --git a/frontend/src/state/wizardReducer.ts b/frontend/src/state/wizardReducer.ts
index a61dfa7..8d4ff36 100644
--- a/frontend/src/state/wizardReducer.ts
+++ b/frontend/src/state/wizardReducer.ts
@@ -57,7 +57,7 @@ export const initialWizardState: WizardState = {
   status: null,
   statusState: "idle",
   statusError: "",
-  setupKind: "cli",
+  setupKind: "desktop",
   selectedAgentIds: [],
   provider: "ppio",
   probeModel: "",