diff --git a/electron/api/routes/ai-proxy.ts b/electron/api/routes/ai-proxy.ts
index 59f0665..c4fae22 100644
--- a/electron/api/routes/ai-proxy.ts
+++ b/electron/api/routes/ai-proxy.ts
@@ -9,6 +9,7 @@ import {
 import { proxyAwareFetch } from '../../utils/proxy-fetch';
 import { logger } from '../../utils/logger';
 import { getOpencodeErrorKind } from '../../../shared/opencode-error-kind';
+import { isOpencodeUpstreamSaturated } from '../../../shared/opencode-error-details';
 
 const AI_PROXY_PREFIX = '/api/ai-proxy/v1';
 const MAX_ERROR_LOG_MESSAGE_LENGTH = 600;
@@ -81,6 +82,9 @@ function getForwardedOneApiStatus(status: number, bodyText: string): number {
   if (status === 429 && getOpencodeErrorKind(bodyText) === 'quota_exhausted') {
     return 402;
   }
+  if (status === 429 && isOpencodeUpstreamSaturated(bodyText)) {
+    return 400;
+  }
   return status;
 }
 
diff --git a/shared/opencode-error-details.ts b/shared/opencode-error-details.ts
new file mode 100644
index 0000000..a8a0d5c
--- /dev/null
+++ b/shared/opencode-error-details.ts
@@ -0,0 +1,6 @@
+export function isOpencodeUpstreamSaturated(message: string | null | undefined): boolean {
+  const normalized = message?.trim().toLowerCase() ?? '';
+  if (!normalized) return false;
+  return normalized.includes('当前分组上游负载已饱和')
+    || (normalized.includes('upstream') && normalized.includes('saturat'));
+}
diff --git a/src/pages/Chat/OpencodeChatPanel.tsx b/src/pages/Chat/OpencodeChatPanel.tsx
index 78d1cd8..5b09d91 100644
--- a/src/pages/Chat/OpencodeChatPanel.tsx
+++ b/src/pages/Chat/OpencodeChatPanel.tsx
@@ -1355,7 +1355,12 @@ export function OpencodeChatPanel({ variant = 'main', navigationDraft, onOpenDev
   }, [authenticationFailureKey, logout]);
 
   useEffect(() => {
-    if (!selectedSessionId || sessionMessages.length > 0 || selectedSessionRunning) return;
+    if (
+      !selectedSessionId
+      || sessionMessages.length > 0
+      || Object.prototype.hasOwnProperty.call(sessionMessagesBySessionId, selectedSessionId)
+      || selectedSessionRunning
+    ) return;
     if (!activeProject || status.state !== 'running') return;
     void loadSessionMessages(selectedSessionId).catch(() => undefined);
   }, [
@@ -1364,6 +1369,7 @@ export function OpencodeChatPanel({ variant = 'main', navigationDraft, onOpenDev
     selectedSessionId,
     selectedSessionRunning,
     sessionMessages.length,
+    sessionMessagesBySessionId,
     status.state,
   ]);
 
@@ -1718,7 +1724,7 @@ export function OpencodeChatPanel({ variant = 'main', navigationDraft, onOpenDev
         const createdSessionId = getSessionId(session);
         if (!createdSessionId) throw new Error('运行时未返回会话 ID');
         await linkProjectSession(activeProject.id, createdSessionId, submissionAgent.id);
-        await selectSession(createdSessionId);
+        await selectSession(createdSessionId, { loadMessages: false });
         submissionSession = {
           id: createdSessionId,
           generation: submissionSession.generation + 1,
diff --git a/src/stores/opencode.ts b/src/stores/opencode.ts
index 62f17bd..fd07041 100644
--- a/src/stores/opencode.ts
+++ b/src/stores/opencode.ts
@@ -210,7 +210,7 @@ interface OpencodeState {
   deleteSession: (sessionId: string) => Promise<void>;
   abortSession: (sessionId: string) => Promise<void>;
   clearSessionSelection: () => void;
-  selectSession: (sessionId: string) => Promise<RawMessage[]>;
+  selectSession: (sessionId: string, options?: { loadMessages?: boolean }) => Promise<RawMessage[]>;
   loadSessionStatuses: () => Promise<OpencodeSessionStatusMap>;
   loadSessionMessages: (sessionId: string) => Promise<RawMessage[]>;
   sendSessionMessage: (sessionId: string, text: string, options?: SendSessionMessageOptions) => Promise<RawMessage[]>;
@@ -3353,7 +3353,7 @@ export const useOpencodeStore = create<OpencodeState>((set, get) => ({
     });
   },
 
-  async selectSession(sessionId) {
+  async selectSession(sessionId, options) {
     const state = get();
     sessionDiffLoadSequence += 1;
     const projectId = getProjectId(state.activeProject);
@@ -3373,6 +3373,12 @@ export const useOpencodeStore = create<OpencodeState>((set, get) => ({
       sessionDiffError: null,
       ...errorState(null),
     });
+    if (
+      options?.loadMessages === false
+      && Object.prototype.hasOwnProperty.call(state.sessionMessagesBySessionId, sessionId)
+    ) {
+      return state.sessionMessagesBySessionId[sessionId] ?? [];
+    }
     return await get().loadSessionMessages(sessionId);
   },
 
diff --git a/tests/e2e/opencode-first-chat.spec.ts b/tests/e2e/opencode-first-chat.spec.ts
new file mode 100644
index 0000000..4ea04a3
--- /dev/null
+++ b/tests/e2e/opencode-first-chat.spec.ts
@@ -0,0 +1,254 @@
+import type { ElectronApplication } from 'playwright-core';
+import { expect, getStableWindow, test } from './fixtures/electron';
+
+type CapturedRequest = {
+  path: string;
+  method: string;
+  body?: Record<string, unknown>;
+};
+
+async function installFirstChatHost(electronApp: ElectronApplication): Promise<void> {
+  await electronApp.evaluate(async () => {
+    const { ipcMain } = process.mainModule!.require('electron') as typeof import('electron');
+    type MainState = {
+      captured: CapturedRequest[];
+      promptPosted: boolean;
+      releaseInitialHistory: (() => void) | null;
+    };
+    const mainGlobal = globalThis as typeof globalThis & {
+      __makeloreFirstChatE2EState?: MainState;
+    };
+    const state: MainState = {
+      captured: [],
+      promptPosted: false,
+      releaseInitialHistory: null,
+    };
+    mainGlobal.__makeloreFirstChatE2EState = state;
+
+    const project = {
+      id: 'prj_first_chat_e2e',
+      path: 'D:/e2e/first-chat',
+      name: 'first-chat',
+      createdAt: '2026-08-12T00:00:00.000Z',
+      updatedAt: '2026-08-12T00:00:00.000Z',
+      lastOpenedAt: '2026-08-12T00:00:00.000Z',
+    };
+    const agent = {
+      id: 'game-development',
+      avatarId: 'avatar-01',
+      roleName: '游戏开发',
+      name: '游戏开发',
+      builtIn: false,
+      enabled: true,
+      model: 'niancode-user-models/qwen3.7-plus',
+      skillIds: [],
+      responsibility: {
+        mission: '实现并验证项目功能。',
+        owns: [],
+        boundaries: [],
+        collaborators: [],
+        principles: [],
+      },
+      prompt: '',
+      archivedAt: null,
+      pinned: false,
+    };
+    const config = {
+      schemaVersion: 1,
+      projectType: 'custom',
+      initialized: true,
+      superpowersEnabled: false,
+      defaultModel: 'niancode-user-models/qwen3.7-plus',
+      agents: [agent],
+      knowledgeDirectory: 'knowledge',
+      createdAt: '2026-08-12T00:00:00.000Z',
+      updatedAt: '2026-08-12T00:00:00.000Z',
+    };
+    const session = {
+      id: 'ses_first_chat_e2e',
+      title: '新对话',
+      agent: agent.id,
+      updatedAt: '2026-08-12T00:00:00.000Z',
+    };
+    let conversationState = {
+      schemaVersion: 1,
+      sessions: [] as Array<Record<string, unknown>>,
+      updatedAt: '2026-08-12T00:00:00.000Z',
+    };
+    const respond = (json: unknown, responseStatus = 200) => ({
+      ok: true,
+      data: {
+        status: responseStatus,
+        ok: responseStatus >= 200 && responseStatus < 300,
+        json,
+      },
+    });
+
+    ipcMain.removeHandler('hostapi:fetch');
+    ipcMain.handle('hostapi:fetch', async (
+      _event,
+      request: { path?: string; method?: string; body?: string | null },
+    ) => {
+      const path = request.path ?? '';
+      const method = request.method ?? 'GET';
+      const body = request.body
+        ? JSON.parse(request.body) as Record<string, unknown>
+        : undefined;
+      state.captured.push({ path, method, ...(body ? { body } : {}) });
+
+      if (path === '/api/opencode/status') {
+        return respond({ state: 'running', port: 4096, url: 'http://127.0.0.1:4096' });
+      }
+      if (path === '/api/opencode/health') {
+        return respond({ ok: true, status: { state: 'running', port: 4096, url: 'http://127.0.0.1:4096' } });
+      }
+      if (path === '/api/opencode/projects' || path.startsWith('/api/opencode/projects?')) {
+        return respond({ projects: [project], activeProject: project });
+      }
+      if (path === '/api/opencode/projects/active' && method === 'GET') {
+        return respond({ projects: [project], activeProject: project });
+      }
+      if (path.startsWith('/api/opencode/projects/config?')) {
+        return respond({ status: 'valid', config, knowledgeFiles: [] });
+      }
+      if (path.startsWith('/api/opencode/projects/template?')) {
+        return respond({ status: 'missing' });
+      }
+      if (path.startsWith('/api/opencode/projects/conversations?')) {
+        return respond({ state: conversationState });
+      }
+      if (path === '/api/opencode/projects/conversations' && method === 'POST') {
+        conversationState = {
+          schemaVersion: 1,
+          sessions: [{
+            sessionId: session.id,
+            agentId: agent.id,
+            archivedAt: null,
+            unreadCount: 0,
+            createdAt: '2026-08-12T00:00:00.000Z',
+            updatedAt: '2026-08-12T00:00:00.000Z',
+          }],
+          updatedAt: '2026-08-12T00:00:00.000Z',
+        };
+        return respond({ success: true, state: conversationState });
+      }
+      if (path === '/api/opencode/config-summary') {
+        return respond({
+          model: 'niancode-user-models/qwen3.7-plus',
+          smallModel: null,
+          providerIds: ['niancode-user-models'],
+          enabledProviderIds: ['niancode-user-models'],
+          providerCount: 1,
+        });
+      }
+      if (path === '/api/provider-accounts') {
+        return respond([{
+          id: 'niancode-user-models',
+          vendorId: 'custom',
+          label: 'Makelore Models',
+          authMode: 'api_key',
+          model: 'qwen3.7-plus',
+          enabled: true,
+          isDefault: true,
+          createdAt: '2026-08-12T00:00:00.000Z',
+          updatedAt: '2026-08-12T00:00:00.000Z',
+        }]);
+      }
+      if (path === '/api/provider-accounts/key-info') {
+        return respond([{
+          accountId: 'niancode-user-models',
+          hasKey: true,
+          keyMasked: 'sk-***',
+        }]);
+      }
+      if (path === '/api/provider-vendors') return respond([]);
+      if (path === '/api/provider-accounts/default') return respond({ accountId: 'niancode-user-models' });
+      if (path === '/api/opencode/sessions' && method === 'POST') {
+        return respond({ success: true, session });
+      }
+      if (path === '/api/opencode/sessions') return respond({ sessions: [] });
+      if (path === '/api/opencode/sessions/status') {
+        return respond({
+          statuses: {
+            [session.id]: { type: state.promptPosted ? 'idle' : 'busy' },
+          },
+        });
+      }
+      if (path === `/api/opencode/sessions/${session.id}/messages` && method === 'GET') {
+        await new Promise<void>((resolve) => {
+          state.releaseInitialHistory = resolve;
+        });
+        return respond({ messages: [] });
+      }
+      if (path === `/api/opencode/sessions/${session.id}/messages` && method === 'POST') {
+        state.promptPosted = true;
+        return respond({ success: true }, 202);
+      }
+      if (path.endsWith('/todos')) return respond({ todos: [] });
+      if (path.endsWith('/diff')) return respond({ diffs: [] });
+      if (path === '/api/opencode/questions') return respond({ questions: [] });
+      if (path === '/api/opencode/permissions') return respond({ permissions: [] });
+      if (path === '/api/opencode/files/status') return respond({ files: [] });
+      if (path === '/api/opencode/commands') return respond({ commands: [], shareEnabled: true });
+      throw new Error(`Unexpected hostapi request: ${method} ${path}`);
+    });
+  });
+}
+
+async function capturedRequests(electronApp: ElectronApplication): Promise<CapturedRequest[]> {
+  return await electronApp.evaluate(() => {
+    const mainGlobal = globalThis as typeof globalThis & {
+      __makeloreFirstChatE2EState?: { captured: CapturedRequest[] };
+    };
+    return structuredClone(mainGlobal.__makeloreFirstChatE2EState?.captured ?? []);
+  });
+}
+
+async function releaseInitialHistory(electronApp: ElectronApplication): Promise<void> {
+  await electronApp.evaluate(() => {
+    const mainGlobal = globalThis as typeof globalThis & {
+      __makeloreFirstChatE2EState?: { releaseInitialHistory: (() => void) | null };
+    };
+    mainGlobal.__makeloreFirstChatE2EState?.releaseInitialHistory?.();
+  });
+}
+
+test('submits the first prompt without waiting for the known-empty session history', async ({
+  launchElectronApp,
+}) => {
+  const electronApp = await launchElectronApp({ skipSetup: true });
+  await installFirstChatHost(electronApp);
+
+  try {
+    let page = await getStableWindow(electronApp);
+    await page.reload();
+    page = await getStableWindow(electronApp);
+    const agent = page.getByTestId('project-agent-chat-game-development');
+    await agent.click();
+    await expect(agent).toHaveAttribute('aria-pressed', 'true');
+    const composer = page.getByRole('textbox');
+    await composer.fill('Build the first playable scene');
+    await expect(composer).toHaveValue('Build the first playable scene');
+    await page.getByTestId('opencode-message-composer').evaluate(
+      (form: HTMLFormElement) => form.requestSubmit(),
+    );
+    await expect.poll(async () => (await capturedRequests(electronApp)).map(
+      (request) => `${request.method} ${request.path}`,
+    )).toContain('POST /api/opencode/sessions');
+
+    await expect.poll(async () => {
+      const requests = await capturedRequests(electronApp);
+      const historyPending = requests.some((request) => (
+        request.path === '/api/opencode/sessions/ses_first_chat_e2e/messages'
+        && request.method === 'GET'
+      ));
+      const promptPosted = requests.some((request) => (
+        request.path === '/api/opencode/sessions/ses_first_chat_e2e/messages'
+        && request.method === 'POST'
+      ));
+      return { historyPending, promptPosted };
+    }).toEqual({ historyPending: true, promptPosted: true });
+  } finally {
+    await releaseInitialHistory(electronApp);
+  }
+});
diff --git a/tests/unit/ai-proxy-routes.test.ts b/tests/unit/ai-proxy-routes.test.ts
index 9baa5bc..78854a7 100644
--- a/tests/unit/ai-proxy-routes.test.ts
+++ b/tests/unit/ai-proxy-routes.test.ts
@@ -336,20 +336,21 @@ describe('ai proxy routes', () => {
     expect(response.body()).toContain('works_square_gateway_authorize_failed');
   });
 
-  it('logs a sanitized one-api error summary when the upstream group is saturated', async () => {
+  it('maps explicit upstream group saturation to a non-retryable response status', async () => {
     seedWorksSquareAIGatewayCredential({
       accessToken: 'ws-ai-token',
       expiresIn: 3600,
       oneApiBaseUrl: 'https://one-api.example.com/v1',
     });
+    const body = JSON.stringify({
+      error: {
+        message: '当前分组上游负载已饱和，请稍后再试 (request id: req-saturated)',
+        code: 'rate_limit_exceeded',
+        type: 'one_api_error',
+      },
+    });
     const fetchMock = vi.fn().mockResolvedValueOnce(
-      new Response(JSON.stringify({
-        error: {
-          message: '当前分组上游负载已饱和，请稍后再试 (request id: req-saturated)',
-          code: 'rate_limit_exceeded',
-          type: 'one_api_error',
-        },
-      }), {
+      new Response(body, {
         status: 429,
         headers: { 'content-type': 'application/json' },
       }),
@@ -364,8 +365,10 @@ describe('ai proxy routes', () => {
       {} as never,
     );
 
-    expect(response.statusCode).toBe(429);
-    expect(response.body()).toContain('当前分组上游负载已饱和');
+    expect(fetchMock).toHaveBeenCalledOnce();
+    expect(response.statusCode).toBe(400);
+    expect(response.header('content-type')).toContain('application/json');
+    expect(response.body()).toBe(body);
     expect(loggerWarnMock).toHaveBeenCalledWith(
       '[ai-proxy] One-api returned non-success response',
       expect.objectContaining({
@@ -380,6 +383,40 @@ describe('ai proxy routes', () => {
     expect(JSON.stringify(loggerWarnMock.mock.calls)).not.toContain('ws-ai-token');
   });
 
+  it('preserves a generic rate-limit response without explicit saturation evidence', async () => {
+    seedWorksSquareAIGatewayCredential({
+      accessToken: 'ws-ai-token',
+      expiresIn: 3600,
+      oneApiBaseUrl: 'https://one-api.example.com/v1',
+    });
+    const body = JSON.stringify({
+      error: {
+        message: 'Rate limit exceeded',
+        code: 'rate_limit_exceeded',
+        type: 'one_api_error',
+      },
+    });
+    const fetchMock = vi.fn().mockResolvedValueOnce(
+      new Response(body, {
+        status: 429,
+        headers: { 'content-type': 'application/json' },
+      }),
+    );
+    vi.stubGlobal('fetch', fetchMock);
+    const response = createResponse();
+
+    await handleAiProxyRoutes(
+      createRequest('POST', { model: 'qwen3.7-max', messages: [] }),
+      response.res,
+      new URL('http://127.0.0.1:13210/api/ai-proxy/v1/chat/completions'),
+      {} as never,
+    );
+
+    expect(fetchMock).toHaveBeenCalledOnce();
+    expect(response.statusCode).toBe(429);
+    expect(response.body()).toBe(body);
+  });
+
   it('strips decoded compression headers from proxied responses', async () => {
     seedWorksSquareAIGatewayCredential({
       accessToken: 'ws-ai-token',
diff --git a/tests/unit/opencode-chat-panel.test.tsx b/tests/unit/opencode-chat-panel.test.tsx
index 93a1e80..46e2eb4 100644
--- a/tests/unit/opencode-chat-panel.test.tsx
+++ b/tests/unit/opencode-chat-panel.test.tsx
@@ -1023,6 +1023,60 @@ describe('OpencodeChatPanel', () => {
     expect(hostApiFetchMock).not.toHaveBeenCalledWith('/api/opencode/sessions', expect.objectContaining({ method: 'POST' }));
   });
 
+  it('submits the first prompt without waiting for the known-empty session history', async () => {
+    const activeProject = {
+      id: 'prj_first_prompt',
+      path: 'D:/repo/first-prompt',
+      name: 'first-prompt',
+      createdAt: '2026-07-12T00:00:00.000Z',
+      updatedAt: '2026-07-12T00:00:00.000Z',
+      lastOpenedAt: '2026-07-12T00:00:00.000Z',
+    };
+    const config = createConfiguredProjectConfig();
+    const requestOrder: string[] = [];
+    const pendingHistory = new Promise<never>(() => undefined);
+    useProjectConfigStore.setState({ configsByProjectId: { [activeProject.id]: config } });
+    useOpencodeStore.setState({
+      status: { state: 'running', port: 4096, url: 'http://127.0.0.1:4096' },
+      projects: [activeProject],
+      activeProject,
+      sessions: [],
+      selectedSessionId: null,
+    });
+    hostApiFetchMock.mockImplementation(async (path: string, init?: RequestInit) => {
+      if (path === '/api/opencode/status') {
+        return { state: 'running', port: 4096, url: 'http://127.0.0.1:4096' };
+      }
+      if (path === '/api/opencode/projects') return { projects: [activeProject], activeProject };
+      if (path === '/api/opencode/config-summary') return useOpencodeStore.getState().runtimeConfigSummary;
+      if (path === '/api/opencode/sessions' && init?.method === 'POST') {
+        requestOrder.push('create');
+        return { success: true, session: { id: 'ses_first_prompt', title: 'New conversation' } };
+      }
+      if (path === '/api/opencode/sessions') return { sessions: [] };
+      if (path === '/api/opencode/sessions/status') return { statuses: { ses_first_prompt: { type: 'busy' } } };
+      if (path === '/api/opencode/sessions/ses_first_prompt/messages' && init?.method === 'POST') {
+        requestOrder.push('prompt');
+        return { success: true };
+      }
+      if (path === '/api/opencode/sessions/ses_first_prompt/messages') {
+        requestOrder.push('history');
+        return pendingHistory;
+      }
+      if (path === '/api/opencode/sessions/ses_first_prompt/todos') return { todos: [] };
+      throw new Error(`Unexpected path ${path}`);
+    });
+
+    render(<OpencodeChatPanel variant="main" />);
+    fireEvent.click(await screen.findByTestId('project-agent-chat-game-art'));
+    const composer = screen.getByRole('textbox');
+    fireEvent.change(composer, { target: { value: 'Build the first scene' } });
+    fireEvent.submit(screen.getByTestId('opencode-message-composer'));
+
+    await waitFor(() => expect(requestOrder).toContain('prompt'));
+    expect(requestOrder.indexOf('prompt')).toBeLessThan(requestOrder.indexOf('history'));
+  });
+
   it('does not create an empty session while selecting a contact without linked history', async () => {
     const activeProject = { id: 'prj_cold_history', path: 'D:/repo/cold-history', name: 'cold-history', createdAt: '2026-07-13T00:00:00.000Z', updatedAt: '2026-07-13T00:00:00.000Z', lastOpenedAt: '2026-07-13T00:00:00.000Z' };
     const config = createConfiguredProjectConfig();
diff --git a/tests/unit/opencode-error-details.test.ts b/tests/unit/opencode-error-details.test.ts
new file mode 100644
index 0000000..b31b401
--- /dev/null
+++ b/tests/unit/opencode-error-details.test.ts
@@ -0,0 +1,21 @@
+import { describe, expect, it } from 'vitest';
+import { isOpencodeUpstreamSaturated } from '../../shared/opencode-error-details';
+
+describe('isOpencodeUpstreamSaturated', () => {
+  it.each([
+    '当前分组上游负载已饱和，请稍后再试',
+    JSON.stringify({ error: { message: 'UPSTREAM capacity is SATURATED; try later' } }),
+  ])('classifies explicit upstream saturation evidence: %s', (message) => {
+    expect(isOpencodeUpstreamSaturated(message)).toBe(true);
+  });
+
+  it.each([
+    'rate_limit_exceeded',
+    JSON.stringify({ error: { code: 'rate_limit_exceeded', message: 'Rate limit exceeded' } }),
+    'upstream request failed',
+    'provider saturated',
+    'user quota is not enough',
+  ])('does not broaden saturation classification to other retry failures: %s', (message) => {
+    expect(isOpencodeUpstreamSaturated(message)).toBe(false);
+  });
+});
diff --git a/tests/unit/opencode-store.test.ts b/tests/unit/opencode-store.test.ts
index b5e3437..0fa8b08 100644
--- a/tests/unit/opencode-store.test.ts
+++ b/tests/unit/opencode-store.test.ts
@@ -1251,6 +1251,40 @@ describe('opencode store', () => {
     expect(useOpencodeStore.getState().sessionMessages).toEqual(loaded);
   });
 
+  it('loads messages when a fast session selection has no known cache entry', async () => {
+    const { hostApiFetch } = await import('@/lib/host-api');
+    vi.mocked(hostApiFetch).mockResolvedValueOnce({
+      messages: [{ id: 'msg_1', role: 'assistant', content: 'Loaded defensively.' }],
+    });
+
+    const loaded = await useOpencodeStore.getState().selectSession(
+      'ses_uncached',
+      { loadMessages: false },
+    );
+
+    expect(hostApiFetch).toHaveBeenCalledWith('/api/opencode/sessions/ses_uncached/messages');
+    expect(loaded).toEqual([
+      expect.objectContaining({ id: 'msg_1', role: 'assistant' }),
+    ]);
+  });
+
+  it('selects a session from a known-empty cache without loading history', async () => {
+    const { hostApiFetch } = await import('@/lib/host-api');
+    useOpencodeStore.setState({
+      sessionMessagesBySessionId: { ses_new: [] },
+    });
+
+    const loaded = await useOpencodeStore.getState().selectSession(
+      'ses_new',
+      { loadMessages: false },
+    );
+
+    expect(loaded).toEqual([]);
+    expect(useOpencodeStore.getState().selectedSessionId).toBe('ses_new');
+    expect(useOpencodeStore.getState().sessionMessages).toEqual([]);
+    expect(hostApiFetch).not.toHaveBeenCalledWith('/api/opencode/sessions/ses_new/messages');
+  });
+
   it('streams assistant updates and tool status before finalizing transcript', async () => {
     const { hostApiFetch } = await import('@/lib/host-api');
     const source = new MockEventSource('/api/opencode/events?sessionId=ses_1');