diff --git a/apps/ai-game-creator-shell/src/view/home/homeStartMode.ts b/apps/ai-game-creator-shell/src/view/home/homeStartMode.ts
new file mode 100644
index 000000000..4724c1066
--- /dev/null
+++ b/apps/ai-game-creator-shell/src/view/home/homeStartMode.ts
@@ -0,0 +1,12 @@
+import type { ProjectStartMode } from '../../app/types';
+import type { HomeCreationType } from './useHomeDraftStore';
+
+export function resolveHomeStartMode(
+  creationType: HomeCreationType,
+  planningCompletionEnabled: boolean,
+): ProjectStartMode {
+  return creationType === 'doc' ||
+    (creationType === 'game' && planningCompletionEnabled)
+    ? 'planning'
+    : 'direct-build';
+}
diff --git a/apps/ai-game-creator-shell/src/view/home/index.tsx b/apps/ai-game-creator-shell/src/view/home/index.tsx
index d1470cb25..74f596b64 100644
--- a/apps/ai-game-creator-shell/src/view/home/index.tsx
+++ b/apps/ai-game-creator-shell/src/view/home/index.tsx
@@ -20,6 +20,7 @@ import {
   richTextToAttachments,
   richTextToPrompt,
 } from './components/RichInputArea/richTextToPrompt';
+import { resolveHomeStartMode } from './homeStartMode';
 import InspirationGallery from './InspirationGallery';
 import {
   type HomeCreationType,
@@ -145,14 +146,18 @@ export default function HomeView({
     (state) => state.setRichText,
   );
   const [homeCreationBusy, setHomeCreationBusy] = useState(false);
+  const [planningCompletionEnabled, setPlanningCompletionEnabled] =
+    useState(false);
   const homeCreationBusyRef = useRef(false);
   const activeCreationType =
     HOME_CREATION_TYPE_ITEMS.find(
       (item) => item.creationType === homeCreationType,
     ) ?? HOME_CREATION_TYPE_ITEMS[0]!;
   // 做方案走立项策划链路，做游戏 / 做素材维持既有的直接开建路由。
-  const startMode: ProjectStartMode =
-    homeCreationType === 'doc' ? 'planning' : 'direct-build';
+  const startMode = resolveHomeStartMode(
+    homeCreationType,
+    planningCompletionEnabled,
+  );
 
   async function createFromHome() {
     if (homeCreationBusyRef.current || creationBusy) {
@@ -241,7 +246,12 @@ export default function HomeView({
                 type="button"
                 key={item.creationType}
                 aria-pressed={isActive}
-                onClick={() => setHomeCreationType(item.creationType)}
+                onClick={() => {
+                  setHomeCreationType(item.creationType);
+                  if (item.creationType !== 'game') {
+                    setPlanningCompletionEnabled(false);
+                  }
+                }}
               >
                 <CreationTypeIcon size={14} aria-hidden="true" />
                 {item.label}
@@ -262,8 +272,21 @@ export default function HomeView({
             }}
           >
             <div className="grid grid-cols-[1fr_auto] items-center gap-2.5 text-[12px] text-(--platform-text-soft)">
-              <div className="flex min-w-0 items-center gap-1.5">
+              <div className="flex min-w-0 items-center gap-3">
                 <UploadButton />
+                {homeCreationType === 'game' ? (
+                  <label className="inline-flex cursor-pointer items-center gap-1.5 whitespace-nowrap">
+                    <input
+                      type="checkbox"
+                      checked={planningCompletionEnabled}
+                      onChange={(event) =>
+                        setPlanningCompletionEnabled(event.target.checked)
+                      }
+                      disabled={homeCreationBusy || creationBusy}
+                    />
+                    <span>策划补全</span>
+                  </label>
+                ) : null}
               </div>
               <div className="flex shrink-0 items-center gap-1.5">
                 <ConversationModelSelect
diff --git a/apps/ai-game-creator-shell/tests/homeStartMode.test.ts b/apps/ai-game-creator-shell/tests/homeStartMode.test.ts
new file mode 100644
index 000000000..3050522a2
--- /dev/null
+++ b/apps/ai-game-creator-shell/tests/homeStartMode.test.ts
@@ -0,0 +1,18 @@
+import { describe, expect, it } from 'vitest';
+
+import { resolveHomeStartMode } from '../src/view/home/homeStartMode';
+
+describe('AGC 首页启动模式', () => {
+  it('做游戏勾选策划补全时进入策划 runtime', () => {
+    expect(resolveHomeStartMode('game', true)).toBe('planning');
+  });
+
+  it('做游戏未勾选策划补全时保持直接创作', () => {
+    expect(resolveHomeStartMode('game', false)).toBe('direct-build');
+  });
+
+  it('做方案始终进入策划 runtime，其他入口不受影响', () => {
+    expect(resolveHomeStartMode('doc', false)).toBe('planning');
+    expect(resolveHomeStartMode('art', true)).toBe('direct-build');
+  });
+});
diff --git a/docs/project-memory/plans/【实施计划】AGC首页策划补全入口-2026-09-15.md b/docs/project-memory/plans/【实施计划】AGC首页策划补全入口-2026-09-15.md
new file mode 100644
index 000000000..8f9ca580c
--- /dev/null
+++ b/docs/project-memory/plans/【实施计划】AGC首页策划补全入口-2026-09-15.md
@@ -0,0 +1,16 @@
+Version: 1
+Status: active
+Date: 2026-09-15
+Parent Spec: 【里程碑】AGC首页策划补全入口-2026-09-15.md
+
+## 修改顺序
+
+1. 在 `view/home/index.tsx` 增加本地复选框状态与入口切换清理。
+2. 将游戏勾选状态映射到既有 `ProjectStartMode`。
+3. 增加首页组件测试覆盖模式分流和显示边界。
+
+## 验证
+
+- AGC 首页相关定向测试。
+- AGC 前端 typecheck。
+- `npm run check:encoding` 与 `git diff --check`。
diff --git a/docs/project-memory/plans/【里程碑】AGC首页策划补全入口-2026-09-15.md b/docs/project-memory/plans/【里程碑】AGC首页策划补全入口-2026-09-15.md
new file mode 100644
index 000000000..04197703c
--- /dev/null
+++ b/docs/project-memory/plans/【里程碑】AGC首页策划补全入口-2026-09-15.md
@@ -0,0 +1,20 @@
+Version: 1
+Status: active
+Date: 2026-09-15
+Parent Spec: AGC 首页与 Agent Runtime 入口
+
+## 范围
+
+在首页“做游戏”输入框下增加“策划补全”复选框；勾选后复用现有 `planning` 启动模式进入策划 Agent Runtime。
+
+## 验收标准
+
+- 仅“做游戏”显示复选框。
+- 勾选时提交 `planning`，未勾选时提交 `direct-build`。
+- “做方案”原有 `planning` 行为保持不变。
+- 切换到其它创作类型时清除游戏专属勾选状态。
+
+## 不做项
+
+- 不新增 runtime 类型、后端接口或持久化字段。
+- 不改变现有策划 runtime 内部流程。