diff --git a/docs/deepseek-harness-runtime-design.md b/docs/deepseek-harness-runtime-design.md
index 5deeadb..388f15f 100644
--- a/docs/deepseek-harness-runtime-design.md
+++ b/docs/deepseek-harness-runtime-design.md
@@ -403,6 +403,7 @@ DeepSeek Harness 首版只使用 GoodBuddy 模型连接：
 - 服务地址必须是 `https://api.deepseek.com`，且不得包含用户信息。
 - 模型名称和服务地址由 Main 传入受控 Host。
 - API Key 继续保存在 GoodBuddy 加密设置中。
+- 启动环境提供的部署连接只由 Main 自动解析，不在 Renderer 中显示为可选来源。
 
 不允许选择 Harness 自有的用户配置文件或自定义 Host。Runtime 始终使用随当前 GoodBuddy 版本发布的内置 Host，并通过完整内部能力握手。
 
diff --git a/src/renderer/src/SettingsPanel.test.tsx b/src/renderer/src/SettingsPanel.test.tsx
index 04769aa..a73fc9b 100644
--- a/src/renderer/src/SettingsPanel.test.tsx
+++ b/src/renderer/src/SettingsPanel.test.tsx
@@ -1372,7 +1372,7 @@ describe('SettingsPanel runtime files', () => {
     )
   })
 
-  it('configures DeepSeek Harness only with Chat Completions or platform settings', async () => {
+  it('configures DeepSeek Harness with a compatible GoodBuddy connection', async () => {
     const harnessProfileId =
       '00000000-0000-4000-8000-000000000051'
     getRuntime.mockResolvedValueOnce({
@@ -1451,8 +1451,12 @@ describe('SettingsPanel runtime files', () => {
       })
     ).not.toBeInTheDocument()
     const source = screen.getByLabelText(
-      'DeepSeek Harness GoodBuddy 模型连接'
+      'DeepSeek Harness DeepSeek 模型连接'
     )
+    expect(screen.queryByRole('radio')).not.toBeInTheDocument()
+    expect(
+      screen.queryByText('使用平台 DeepSeek 环境配置')
+    ).not.toBeInTheDocument()
     expect(
       within(source).getByRole('option', { name: '默认模型（不兼容）' })
     ).toBeDisabled()
@@ -1460,22 +1464,20 @@ describe('SettingsPanel runtime files', () => {
       within(source).getByRole('option', { name: 'DeepSeek Chat' })
     ).not.toBeDisabled()
 
-    fireEvent.click(
-      screen.getByRole('radio', {
-        name: /使用平台 DeepSeek 环境配置/
-      })
-    )
     fireEvent.click(screen.getByRole('button', { name: '保存设置' }))
     await waitFor(() =>
       expect(updateRuntime).toHaveBeenCalledWith(
         expect.objectContaining({
-          deepseekHarnessModelSource: { kind: 'platform' }
+          deepseekHarnessModelSource: {
+            kind: 'profile',
+            profileId: harnessProfileId
+          }
         })
       )
     )
   })
 
-  it('normalizes an environment-managed DeepSeek profile to the platform source when saving', async () => {
+  it('keeps an environment-managed source compatible without exposing it as an option', async () => {
     getRuntime.mockResolvedValueOnce({
       ...runtimeSettings,
       modelBaseUrl: 'https://api.deepseek.com',
@@ -1527,11 +1529,17 @@ describe('SettingsPanel runtime files', () => {
         name: 'DeepSeek Harness（预览）'
       })
     )
-    fireEvent.click(
-      screen.getByRole('radio', {
-        name: /使用 GoodBuddy 模型连接/
-      })
+    expect(screen.queryByRole('radio')).not.toBeInTheDocument()
+    expect(
+      screen.getByText('管理员预置的 DeepSeek 连接')
+    ).toBeInTheDocument()
+    const source = screen.getByLabelText(
+      'DeepSeek Harness DeepSeek 模型连接'
     )
+    expect(source).toHaveValue('')
+    fireEvent.change(source, {
+      target: { value: runtimeSettings.modelProfiles[0]!.id }
+    })
     fireEvent.click(screen.getByRole('button', { name: '保存设置' }))
 
     await waitFor(() =>
diff --git a/src/renderer/src/SettingsPanel.tsx b/src/renderer/src/SettingsPanel.tsx
index b5ee000..0eef3c6 100644
--- a/src/renderer/src/SettingsPanel.tsx
+++ b/src/renderer/src/SettingsPanel.tsx
@@ -1981,7 +1981,7 @@ export function SettingsPanel({
                 detecting={detecting}
                 modelConfiguration={
                   activeRuntimeModelSource.kind === 'platform'
-                    ? t('runtime.deepseekHarness.platformSource')
+                    ? t('runtime.deepseekHarness.managedSource')
                     : activeRuntimeModelProfile
                       ? t('runtime.followGoodBuddy', {
                           name: modelProfileDisplayName(
@@ -1998,100 +1998,48 @@ export function SettingsPanel({
                   runtime: 'DeepSeek Harness'
                 })}
               />
-              <fieldset className="runtime-source-options">
-                <legend>{t('runtime.sourceLegend')}</legend>
-                <label>
-                  <input
-                    checked={
-                      deepseekHarnessModelSource.kind === 'profile'
-                    }
-                    disabled={!defaultDeepseekHarnessModelProfile}
-                    name="deepseek-harness-model-source"
-                    onChange={() => {
-                      if (defaultDeepseekHarnessModelProfile) {
-                        setDeepseekHarnessModelSource({
-                          kind: 'profile',
-                          profileId:
-                            defaultDeepseekHarnessModelProfile.id
-                        })
-                      }
-                    }}
-                    type="radio"
-                  />
-                  <span>
-                    <strong>
-                      {t(
-                        'runtime.deepseekHarness.goodBuddySource'
-                      )}
-                    </strong>
-                    <small>
-                      {t(
-                        'runtime.deepseekHarness.goodBuddySourceDescription'
-                      )}
-                    </small>
-                  </span>
-                </label>
-                <label>
-                  <input
-                    checked={
-                      deepseekHarnessModelSource.kind === 'platform'
-                    }
-                    name="deepseek-harness-model-source"
-                    onChange={() =>
-                      setDeepseekHarnessModelSource({
-                        kind: 'platform'
-                      })
-                    }
-                    type="radio"
-                  />
-                  <span>
-                    <strong>
-                      {t('runtime.deepseekHarness.platformSource')}
-                    </strong>
-                    <small>
-                      {t(
-                        'runtime.deepseekHarness.platformSourceDescription'
-                      )}
-                    </small>
-                  </span>
-                </label>
-              </fieldset>
-              {deepseekHarnessModelSource.kind === 'profile' && (
-                <label className="field">
-                  <span>{t('runtime.goodBuddyConnection')}</span>
-                  <select
-                    aria-label={`DeepSeek Harness ${t(
-                      'runtime.goodBuddyConnection'
-                    )}`}
-                    onChange={(event) =>
-                      setDeepseekHarnessModelSource(
-                        parseModelSource(event.target.value)
-                      )
-                    }
-                    value={deepseekHarnessModelSource.profileId}
-                  >
-                    {modelProfiles.map((profile) => (
-                      <option
-                        disabled={
-                          !isDeepseekHarnessCompatible(profile)
-                        }
-                        key={profile.id}
-                        value={profile.id}
-                      >
-                        {modelProfileDisplayName(profile)}
-                        {isDeepseekHarnessCompatible(profile)
-                          ? ''
-                          : t('runtime.incompatibleSuffix')}
-                      </option>
-                    ))}
-                  </select>
-                  <small>
+              <label className="field">
+                <span>{t('runtime.deepseekHarness.connection')}</span>
+                <select
+                  aria-label={`DeepSeek Harness ${t(
+                    'runtime.deepseekHarness.connection'
+                  )}`}
+                  disabled={!defaultDeepseekHarnessModelProfile}
+                  onChange={(event) =>
+                    setDeepseekHarnessModelSource(
+                      parseModelSource(event.target.value)
+                    )
+                  }
+                  value={
+                    deepseekHarnessModelSource.kind === 'profile'
+                      ? deepseekHarnessModelSource.profileId
+                      : ''
+                  }
+                >
+                  <option disabled value="">
                     {t(
-                      'runtime.deepseekHarness.connectionDescription'
+                      'runtime.deepseekHarness.connectionPlaceholder'
                     )}
-                  </small>
-                </label>
-              )}
+                  </option>
+                  {modelProfiles.map((profile) => (
+                    <option
+                      disabled={!isDeepseekHarnessCompatible(profile)}
+                      key={profile.id}
+                      value={profile.id}
+                    >
+                      {modelProfileDisplayName(profile)}
+                      {isDeepseekHarnessCompatible(profile)
+                        ? ''
+                        : t('runtime.incompatibleSuffix')}
+                    </option>
+                  ))}
+                </select>
+                <small>
+                  {t(
+                    'runtime.deepseekHarness.connectionDescription'
+                  )}
+                </small>
+              </label>
               <details className="settings-section">
                 <summary>{t('runtime.advanced')}</summary>
                 <p className="settings-panel__description">
diff --git a/src/renderer/src/i18n/locales/en-US/settings.ts b/src/renderer/src/i18n/locales/en-US/settings.ts
index e221d32..3b714c6 100644
--- a/src/renderer/src/i18n/locales/en-US/settings.ts
+++ b/src/renderer/src/i18n/locales/en-US/settings.ts
@@ -242,14 +242,11 @@ export const settings = {
         'DeepSeek Harness currently supports DeepSeek models only and is not intended for other model providers.',
       description:
         'GoodBuddy maintains the fixed Host and control protocol internally and uses pinned Harness libraries underneath. Execute tool calls receive automatic one-time authorization, Ask remains read-only, and cancellation and workspace safety boundaries remain in place. It does not integrate with the DSH plugin or marketplace mechanisms.',
-      goodBuddySource: 'Use a GoodBuddy model connection',
-      goodBuddySourceDescription:
-        'Only OpenAI-compatible Chat Completions connections are available. The connection must point to a DeepSeek model.',
-      platformSource: 'Use platform DeepSeek environment settings',
-      platformSourceDescription:
-        'Reads platform-managed DeepSeek settings from the launch environment without exposing credentials to the renderer.',
+      managedSource: 'Administrator-provided DeepSeek connection',
+      connection: 'DeepSeek model connection',
+      connectionPlaceholder: 'Select a DeepSeek model connection',
       connectionDescription:
-        'The internal GoodBuddy Harness Runtime currently accepts only the OpenAI-compatible Chat Completions protocol.',
+        'Choose a GoodBuddy model connection. Only OpenAI-compatible Chat Completions connections that point to DeepSeek are supported.',
       advancedDescription:
         'This Runtime always uses GoodBuddy’s bundled, version-pinned Host. It does not load external DSH plugins, marketplace packages, user profiles, or custom Hosts.'
     }
diff --git a/src/renderer/src/i18n/locales/zh-CN/settings.ts b/src/renderer/src/i18n/locales/zh-CN/settings.ts
index 93e2454..11f1d54 100644
--- a/src/renderer/src/i18n/locales/zh-CN/settings.ts
+++ b/src/renderer/src/i18n/locales/zh-CN/settings.ts
@@ -220,14 +220,11 @@ export const settings = {
         'DeepSeek Harness 当前仅支持 DeepSeek 模型，不适用于其他模型提供商。',
       description:
         '由 GoodBuddy 内部维护固定 Host 与控制协议，复用锁定的 Harness 底层库；Execute 工具调用自动单次授权，Ask 保持只读，并保留取消和工作区安全边界；不接入 DSH 插件或市场机制。',
-      goodBuddySource: '使用 GoodBuddy 模型连接',
-      goodBuddySourceDescription:
-        '只能选择 OpenAI 兼容 Chat Completions 连接；该连接必须指向 DeepSeek 模型。',
-      platformSource: '使用平台 DeepSeek 环境配置',
-      platformSourceDescription:
-        '从启动环境读取平台管理的 DeepSeek 配置，不会在渲染进程中显示凭据。',
+      managedSource: '管理员预置的 DeepSeek 连接',
+      connection: 'DeepSeek 模型连接',
+      connectionPlaceholder: '选择 DeepSeek 模型连接',
       connectionDescription:
-        'GoodBuddy 内部 Harness Runtime 目前仅接受 OpenAI 兼容 Chat Completions 协议。',
+        '从 GoodBuddy 模型连接中选择；仅支持指向 DeepSeek 的 OpenAI 兼容 Chat Completions 连接。',
       advancedDescription:
         '该 Runtime 始终使用 GoodBuddy 内置并固定版本的 Host，不加载外部 DSH 插件、市场包、用户 profile 或自定义 Host。'
     }