diff --git a/apps/admin/src/components/AiChat/AiMessageContent.tsx b/apps/admin/src/components/AiChat/AiMessageContent.tsx
index b70aaf8..f9e10de 100644
--- a/apps/admin/src/components/AiChat/AiMessageContent.tsx
+++ b/apps/admin/src/components/AiChat/AiMessageContent.tsx
@@ -56,6 +56,9 @@ const toolLabels: Record<string, string> = {
   search_classrooms: '查询教室',
   search_classroom_rentals: '查询教室租用',
   get_sync_status: '查询同步状态',
+  get_business_context: '读取业务流程',
+  get_entity_schema: '读取实体字典',
+  get_pending_tasks: '查询业务待办',
 };
 
 const markdownComponents = {
diff --git a/apps/admin/src/components/AiChat/DynamicForm.tsx b/apps/admin/src/components/AiChat/DynamicForm.tsx
index 4de1f7d..8148f58 100644
--- a/apps/admin/src/components/AiChat/DynamicForm.tsx
+++ b/apps/admin/src/components/AiChat/DynamicForm.tsx
@@ -84,6 +84,7 @@ const FormPreview: React.FC<FormPreviewProps> = ({ form, disabled, onAction }) =
   );
   if (!form) return null;
   const finished = Boolean(form.submitted) || form.status === 'submitted';
+  const expired = form.status === 'expired';
 
   const handleFinish = (values: Record<string, unknown>) => {
     onAction?.('form:submit', { values: normalizeValues(form.fields, values) });
@@ -97,7 +98,9 @@ const FormPreview: React.FC<FormPreviewProps> = ({ form, disabled, onAction }) =
           {form.description}
         </Typography.Text>
       )}
-      {finished ? (
+      {expired ? (
+        <Alert type="warning" showIcon title="表单已失效" description="此表单已被新的请求替代，请让助手重新生成。" />
+      ) : finished ? (
         <Alert type="success" showIcon title="已提交，AI 正在处理…" />
       ) : (
         <Form
diff --git a/apps/admin/src/components/AiChat/bubble.integration.test.tsx b/apps/admin/src/components/AiChat/bubble.integration.test.tsx
index b7fab93..46f1352 100644
--- a/apps/admin/src/components/AiChat/bubble.integration.test.tsx
+++ b/apps/admin/src/components/AiChat/bubble.integration.test.tsx
@@ -103,6 +103,38 @@ describe('AI chat bubble rendering', () => {
     expect(container.textContent).toContain('已提交');
   });
 
+  it('renders an expired A2UI form as disabled without submit action', async () => {
+    let submitted = false;
+    const el = document.createElement('div');
+    container = el;
+    document.body.appendChild(el);
+    root = createRoot(el);
+
+    await act(async () => {
+      root?.render(
+        <DynamicForm
+          form={{
+            id: 'form-expired',
+            title: '已失效的表单',
+            status: 'expired',
+            fields: [{ name: 'name', label: '姓名', type: 'input', required: true }],
+          }}
+          onSubmit={() => {
+            submitted = true;
+          }}
+        />,
+      );
+    });
+
+    expect(el.textContent).toContain('已失效');
+    expect(el.querySelector('button[type="submit"]')).toBeNull();
+    await act(async () => {
+      const buttons = Array.from(el.querySelectorAll('button'));
+      buttons.forEach((button) => button.click());
+    });
+    expect(submitted).toBe(false);
+  });
+
   it('renders an A2UI review card and submits via the confirm button', async () => {
     let submittedId: string | null = null;
     const review: AiReviewSchema = {
diff --git a/apps/admin/src/components/AiChat/message-mappers.integration.test.ts b/apps/admin/src/components/AiChat/message-mappers.integration.test.ts
index 60ea6ee..baf9410 100644
--- a/apps/admin/src/components/AiChat/message-mappers.integration.test.ts
+++ b/apps/admin/src/components/AiChat/message-mappers.integration.test.ts
@@ -78,6 +78,52 @@ describe('AI chat history mapper', () => {
     expect(mapped.message.forms?.[0]).toMatchObject({ id: 'form-9', title: '新增学生' });
   });
 
+  it('restores uiArtifacts from message metadata and derives legacy lists', () => {
+    const mapped = mapHistoryMessage({
+      id: 8,
+      role: 'assistant',
+      content: '请处理',
+      reasoningContent: null,
+      status: 'completed',
+      errorCode: null,
+      createdAt: '2026-07-23T00:00:00.000Z',
+      metadata: {
+        uiArtifacts: [
+          {
+            id: 'form-10',
+            type: 'form',
+            status: 'submitted',
+            messageId: 8,
+            conversationId: 3,
+            payload: {
+              id: 'form-10',
+              title: '新增学生',
+              status: 'submitted',
+              fields: [],
+            },
+          },
+          {
+            id: 'review-10',
+            type: 'review',
+            status: 'expired',
+            messageId: 8,
+            conversationId: 3,
+            payload: {
+              id: 'review-10',
+              title: '旧预览',
+              status: 'expired',
+              sections: [],
+            },
+          },
+        ],
+      },
+    });
+
+    expect(mapped.message.uiArtifacts).toHaveLength(2);
+    expect(mapped.message.forms?.[0]).toMatchObject({ id: 'form-10', status: 'submitted' });
+    expect(mapped.message.reviews?.[0]).toMatchObject({ id: 'review-10', status: 'expired' });
+  });
+
   it('restores a persisted A2UI review from message metadata', () => {
     const mapped = mapHistoryMessage({
       id: 6,
diff --git a/apps/admin/src/components/AiChat/message-mappers.ts b/apps/admin/src/components/AiChat/message-mappers.ts
index e3a1390..68688a8 100644
--- a/apps/admin/src/components/AiChat/message-mappers.ts
+++ b/apps/admin/src/components/AiChat/message-mappers.ts
@@ -3,11 +3,13 @@ import type {
   AiChatMessage,
   AiChatMessageStatus,
   AiChartSchema,
+  AiArtifactSchema,
   AiFormSchema,
   AiMessageRecord,
   AiReviewSchema,
   AiToolRun,
 } from './types';
+import { mergeArtifactIntoMessage } from './provider';
 
 function mapStatus(record: AiMessageRecord): AiChatMessageStatus {
   if (record.status === 'pending') return 'loading';
@@ -50,24 +52,40 @@ function historyCharts(record: AiMessageRecord): AiChartSchema[] | undefined {
   return [a2uiChart as AiChartSchema];
 }
 
+function historyArtifacts(record: AiMessageRecord) {
+  const artifacts = record.metadata?.uiArtifacts;
+  if (!Array.isArray(artifacts)) return undefined;
+  return artifacts.filter(
+    (item): item is AiArtifactSchema =>
+      Boolean(item) && typeof item === 'object' && typeof (item as AiArtifactSchema).id === 'string',
+  );
+}
+
 export function mapHistoryMessage(record: AiMessageRecord): MessageInfo<AiChatMessage> {
+  const artifacts = historyArtifacts(record);
+  const baseMessage = {
+    id: record.id,
+    role: record.role,
+    content: record.content || '',
+    reasoningContent: record.reasoningContent || '',
+    toolRuns: (record.toolRuns || []).map(normalizeToolRun),
+    attachments: record.attachments ?? [],
+    forms: historyForms(record),
+    reviews: historyReviews(record),
+    charts: historyCharts(record),
+    replyToMessageId: record.replyToMessageId,
+    metadata: record.metadata,
+    error: record.status === 'failed' ? record.errorCode || 'AI 回答生成失败' : undefined,
+    cancelled: record.status === 'cancelled',
+  };
+  if (artifacts) {
+    for (const artifact of artifacts) {
+      mergeArtifactIntoMessage(baseMessage as AiChatMessage, artifact);
+    }
+  }
   return {
     id: record.id,
     status: mapStatus(record),
-    message: {
-      id: record.id,
-      role: record.role,
-      content: record.content || '',
-      reasoningContent: record.reasoningContent || '',
-      toolRuns: (record.toolRuns || []).map(normalizeToolRun),
-      attachments: record.attachments ?? [],
-      forms: historyForms(record),
-      reviews: historyReviews(record),
-      charts: historyCharts(record),
-      replyToMessageId: record.replyToMessageId,
-      metadata: record.metadata,
-      error: record.status === 'failed' ? record.errorCode || 'AI 回答生成失败' : undefined,
-      cancelled: record.status === 'cancelled',
-    },
+    message: baseMessage as AiChatMessage,
   };
 }
diff --git a/apps/admin/src/components/AiChat/provider.integration.test.ts b/apps/admin/src/components/AiChat/provider.integration.test.ts
index d1f1f43..c552dfe 100644
--- a/apps/admin/src/components/AiChat/provider.integration.test.ts
+++ b/apps/admin/src/components/AiChat/provider.integration.test.ts
@@ -154,6 +154,41 @@ describe('AI chat SSE message reducer', () => {
     expect(message.forms?.[1]).toMatchObject({ id: 'form-2' });
   });
 
+  it('merges ui.artifact events into uiArtifacts and legacy lists by id', () => {
+    let message = reduceAiSseMessage(undefined, {
+      event: 'ui.artifact',
+      data: JSON.stringify({
+        messageId: 12,
+        artifact: {
+          id: 'form-1',
+          type: 'form',
+          status: 'pending',
+          messageId: 12,
+          conversationId: 3,
+          payload: { id: 'form-1', title: '新增学生', fields: [] },
+        },
+      }),
+    });
+    message = reduceAiSseMessage(message, {
+      event: 'ui.artifact',
+      data: JSON.stringify({
+        messageId: 12,
+        artifact: {
+          id: 'review-1',
+          type: 'review',
+          status: 'expired',
+          messageId: 12,
+          conversationId: 3,
+          payload: { id: 'review-1', title: '旧导入预览', status: 'expired', sections: [] },
+        },
+      }),
+    });
+
+    expect(message.uiArtifacts).toHaveLength(2);
+    expect(message.forms?.[0]).toMatchObject({ id: 'form-1', title: '新增学生' });
+    expect(message.reviews?.[0]).toMatchObject({ id: 'review-1', status: 'expired' });
+  });
+
   it('stores ui.import_preflight in message metadata and restores it from completed message', () => {
     const preflight = {
       verdict: 'needs_input',
diff --git a/apps/admin/src/components/AiChat/provider.ts b/apps/admin/src/components/AiChat/provider.ts
index e8f7309..970fdef 100644
--- a/apps/admin/src/components/AiChat/provider.ts
+++ b/apps/admin/src/components/AiChat/provider.ts
@@ -8,6 +8,7 @@ import { usePermissionStore } from '../../store/permission/permissionStore';
 import { useUserStore } from '../../store/user/userStore';
 import type {
   AiAttachment,
+  AiArtifactSchema,
   AiChatInput,
   AiChatMessage,
   AiChartSchema,
@@ -34,6 +35,7 @@ interface AiSsePayload {
   durationMs?: number | null;
   attachment?: AiAttachment;
   form?: AiFormSchema;
+  artifact?: AiArtifactSchema;
   review?: AiReviewSchema;
   chart?: AiChartSchema;
   preflight?: AiImportPreflight;
@@ -62,6 +64,7 @@ function emptyAssistant(): AiChatMessage {
     toolRuns: [],
     attachments: [],
     forms: [],
+    uiArtifacts: [],
   };
 }
 
@@ -165,10 +168,50 @@ function applyMessagePayload(
     message.charts,
     (nested.metadata?.a2uiChart as AiChartSchema | AiChartSchema[] | undefined) ?? payload.chart,
   );
+  const artifacts = nested.metadata?.uiArtifacts;
+  if (Array.isArray(artifacts)) {
+    for (const artifact of artifacts) {
+      if (artifact && typeof artifact === 'object' && typeof artifact.id === 'string') {
+        mergeArtifactIntoMessage(message, artifact as AiArtifactSchema);
+      }
+    }
+  }
   message.replyToMessageId = nested.replyToMessageId ?? message.replyToMessageId;
   message.metadata = nested.metadata ?? message.metadata;
 }
 
+/**
+ * 将统一 artifact 归入 uiArtifacts，并按类型派发到 legacy 列表。
+ */
+export function mergeArtifactIntoMessage(
+  message: AiChatMessage,
+  artifact: AiArtifactSchema,
+): AiChatMessage {
+  message.uiArtifacts = mergeById<AiArtifactSchema>(message.uiArtifacts, artifact);
+  const payload =
+    artifact.payload && typeof artifact.payload === 'object'
+      ? (artifact.payload as Record<string, unknown>)
+      : {};
+  if (artifact.type === 'form') {
+    message.forms = mergeForms(message.forms, payload as unknown as AiFormSchema);
+  } else if (artifact.type === 'review') {
+    message.reviews = mergeById<AiReviewSchema>(
+      message.reviews,
+      payload as unknown as AiReviewSchema,
+    );
+  } else if (artifact.type === 'chart') {
+    message.charts = mergeById<AiChartSchema>(
+      message.charts,
+      payload as unknown as AiChartSchema,
+    );
+  } else if (artifact.type === 'import_preflight') {
+    message.metadata = { ...message.metadata, a2uiImportPreflight: payload };
+  } else if (artifact.type === 'import_wizard') {
+    message.metadata = { ...message.metadata, a2uiImportWizard: payload };
+  }
+  return message;
+}
+
 export function reduceAiSseMessage(
   originMessage: AiChatMessage | undefined,
   chunk?: AiSseChunk,
@@ -198,6 +241,8 @@ export function reduceAiSseMessage(
     message.reviews = mergeById<AiReviewSchema>(message.reviews, payload.review);
   } else if (event === 'ui.chart' && payload.chart) {
     message.charts = mergeById<AiChartSchema>(message.charts, payload.chart);
+  } else if (event === 'ui.artifact' && payload.artifact) {
+    mergeArtifactIntoMessage(message, payload.artifact);
   } else if (event === 'ui.import_preflight' && payload.preflight) {
     message.metadata = { ...message.metadata, a2uiImportPreflight: payload.preflight };
   } else if (event === 'ui.import_wizard' && payload.wizard) {
@@ -319,6 +364,7 @@ export class GongxueAiChatProvider extends AbstractChatProvider<
 > {
   /** Routes events that target another (already streamed) message. */
   onExternalReview?: (messageId: number, review: AiReviewSchema) => void;
+  onExternalArtifact?: (messageId: number, artifact: AiArtifactSchema) => void;
 
   constructor(url: string, onSettled?: (result?: { ok: boolean; aborted?: boolean }) => void) {
     super({
@@ -404,6 +450,30 @@ export class GongxueAiChatProvider extends AbstractChatProvider<
 
   transformMessage(info: TransformMessage<AiChatMessage, AiSseChunk>): AiChatMessage {
     const { event, payload } = parseSsePayload(info.chunk);
+    if (
+      event === 'ui.artifact' &&
+      payload.artifact &&
+      typeof payload.messageId === 'number' &&
+      info.originMessage?.id !== payload.messageId
+    ) {
+      this.onExternalArtifact?.(payload.messageId, payload.artifact);
+      return info.originMessage ?? emptyAssistant();
+    }
+    if (
+      event === 'ui.form' &&
+      payload.form &&
+      typeof payload.messageId === 'number' &&
+      info.originMessage?.id !== payload.messageId
+    ) {
+      this.onExternalArtifact?.(payload.messageId, {
+        id: payload.form.id,
+        type: 'form',
+        status: payload.form.status ?? 'pending',
+        messageId: payload.messageId,
+        payload: payload.form,
+      });
+      return info.originMessage ?? emptyAssistant();
+    }
     if (
       event === 'ui.review' &&
       payload.review &&
diff --git a/apps/admin/src/components/AiChat/types.ts b/apps/admin/src/components/AiChat/types.ts
index ac2fc59..31bac56 100644
--- a/apps/admin/src/components/AiChat/types.ts
+++ b/apps/admin/src/components/AiChat/types.ts
@@ -52,7 +52,7 @@ export interface AiFormSchema {
   description?: string | null;
   submitLabel?: string;
   fields: AiFormField[];
-  status?: 'pending' | 'submitted';
+  status?: 'pending' | 'submitted' | 'expired';
 }
 
 export interface AiReviewColumn {
@@ -98,6 +98,27 @@ export interface AiChartSchema {
   rows: AiReviewRow[];
 }
 
+export type AiArtifactType =
+  | 'form'
+  | 'review'
+  | 'chart'
+  | 'import_preflight'
+  | 'import_wizard';
+
+export type AiArtifactStatus = 'rendering' | 'pending' | 'submitted' | 'expired' | 'cancelled';
+
+export interface AiArtifactSchema<T = unknown> {
+  id: string;
+  type: AiArtifactType;
+  status: AiArtifactStatus;
+  messageId: number;
+  conversationId?: number;
+  payload: T;
+  createdAt?: string | null;
+  submittedAt?: string | null;
+  supersededBy?: string | null;
+}
+
 export interface AiImportWizard {
   runId: string;
   fileName: string;
@@ -216,6 +237,7 @@ export interface AiChatMessage {
   forms?: AiFormSchema[];
   reviews?: AiReviewSchema[];
   charts?: AiChartSchema[];
+  uiArtifacts?: AiArtifactSchema[];
   replyToMessageId?: number | null;
   metadata?: Record<string, unknown> | null;
   retrying?: AiModelRetryInfo | null;
diff --git a/apps/admin/src/components/AiChat/useAiChatMessageActions.tsx b/apps/admin/src/components/AiChat/useAiChatMessageActions.tsx
index a6607f9..91a42dc 100644
--- a/apps/admin/src/components/AiChat/useAiChatMessageActions.tsx
+++ b/apps/admin/src/components/AiChat/useAiChatMessageActions.tsx
@@ -9,7 +9,7 @@ import { useSettingsStore } from '../../store/settings/settingsStore';
 import { aiChatApi, resolveImportPreflight, type ResolveImportPreflightInput } from './api';
 import { AiMessageContent } from './AiMessageContent';
 import { mapHistoryMessage } from './message-mappers';
-import { GongxueAiChatProvider } from './provider';
+import { GongxueAiChatProvider, mergeArtifactIntoMessage } from './provider';
 import {
   emptyAssistant,
   MessageHoverActions,
@@ -111,6 +111,11 @@ export function useAiChatMessageActions({
         },
       }));
     };
+    provider.onExternalArtifact = (messageId, artifact) => {
+      setMessage(messageId, (info) => ({
+        message: mergeArtifactIntoMessage(info.message, artifact),
+      }));
+    };
   }, [provider, setMessage]);
 
   requestingRef.current = isRequesting;
diff --git a/apps/server/src/agent-context/business-context.registry.ts b/apps/server/src/agent-context/business-context.registry.ts
new file mode 100644
index 0000000..c6a8939
--- /dev/null
+++ b/apps/server/src/agent-context/business-context.registry.ts
@@ -0,0 +1,318 @@
+import type {
+  BusinessEntity,
+  BusinessWorkflow,
+} from './business-context.types';
+
+/**
+ * 恭学系统业务上下文（代码内维护）。
+ *
+ * v1 覆盖三大闭环：学生教学、住宿计费、教室租赁。实体字段字典用于
+ * render_form 生成正确表单，工作流阶段/前置依赖/下一步建议用于引导
+ * Agent 感知业务流程。
+ */
+export const BUSINESS_ENTITIES: readonly BusinessEntity[] = [
+  {
+    key: 'student',
+    name: '学生档案',
+    description: '学生基础档案（姓名、学号、手机号、性别等），是分班、入住、账单的前置数据。',
+    searchTool: 'search_students',
+    requiredPermissions: ['student:view'],
+    fields: [
+      { key: 'name', label: '姓名', type: 'string', required: true },
+      { key: 'studentNo', label: '学号', type: 'string' },
+      { key: 'phone', label: '手机号', type: 'string' },
+      { key: 'gender', label: '性别', type: 'enum', enumFrom: 'student.gender' },
+      { key: 'idNumber', label: '身份证号', type: 'string' },
+    ],
+    relations: [
+      { entityKey: 'class', via: 'class_student', requiredFor: ['class'] },
+      { entityKey: 'occupancy', via: 'occupancy', requiredFor: ['checkin'] },
+      { entityKey: 'bill', via: 'bill', requiredFor: ['bill'] },
+      { entityKey: 'exam', via: 'exam_score', requiredFor: ['exam'] },
+    ],
+  },
+  {
+    key: 'class',
+    name: '班级',
+    description: '班级档案与在读分班关系，排课、考勤、考试依赖班级。',
+    searchTool: 'search_classes',
+    requiredPermissions: ['class:view'],
+    fields: [
+      { key: 'name', label: '班级名称', type: 'string', required: true },
+      { key: 'grade', label: '年级', type: 'string' },
+      { key: 'headTeacher', label: '班主任', type: 'string' },
+    ],
+    relations: [
+      { entityKey: 'student', via: 'class_student', requiredFor: ['class'] },
+      { entityKey: 'schedule', via: 'class_schedule', requiredFor: ['schedule'] },
+    ],
+  },
+  {
+    key: 'schedule',
+    name: '排课/日程',
+    description: '班级与教室的课程安排，考勤和教室日程依赖排课。',
+    searchTool: 'search_schedules',
+    requiredPermissions: ['schedule:view'],
+    fields: [
+      { key: 'classId', label: '班级', type: 'number' },
+      { key: 'classroomId', label: '教室', type: 'number' },
+      { key: 'weekDay', label: '星期', type: 'number' },
+      { key: 'startTime', label: '开始时间', type: 'string' },
+      { key: 'endTime', label: '结束时间', type: 'string' },
+    ],
+    relations: [
+      { entityKey: 'class', via: 'class_schedule', requiredFor: ['schedule'] },
+      { entityKey: 'classroom', via: 'class_schedule', requiredFor: ['schedule'] },
+    ],
+  },
+  {
+    key: 'attendance',
+    name: '考勤',
+    description: '按班级与日期的考勤记录（出勤/迟到/缺勤/请假）。',
+    searchTool: 'get_attendance_summary',
+    requiredPermissions: ['attendance:view'],
+    fields: [
+      { key: 'studentId', label: '学生', type: 'number', required: true },
+      { key: 'date', label: '日期', type: 'date', required: true },
+      { key: 'status', label: '状态', type: 'enum', enumFrom: 'attendance.status' },
+    ],
+    relations: [
+      { entityKey: 'class', via: 'class_schedule', requiredFor: ['attendance'] },
+      { entityKey: 'schedule', via: 'class_schedule', requiredFor: ['attendance'] },
+    ],
+  },
+  {
+    key: 'exam',
+    name: '考试/成绩',
+    description: '考试安排与成绩记录，依赖班级与学生档案。',
+    searchTool: 'search_exams',
+    requiredPermissions: ['exam:view'],
+    fields: [
+      { key: 'name', label: '考试名称', type: 'string', required: true },
+      { key: 'date', label: '考试日期', type: 'date' },
+      { key: 'subject', label: '科目', type: 'string' },
+    ],
+    relations: [
+      { entityKey: 'class', via: 'exam_score', requiredFor: ['exam'] },
+      { entityKey: 'student', via: 'exam_score', requiredFor: ['exam'] },
+    ],
+  },
+  {
+    key: 'room',
+    name: '宿舍档案',
+    description: '宿舍/床位基础档案，入住登记的前置数据。',
+    searchTool: 'search_rooms',
+    requiredPermissions: ['room:view'],
+    fields: [
+      { key: 'roomNumber', label: '宿舍号', type: 'string', required: true },
+      { key: 'building', label: '楼栋', type: 'string' },
+      { key: 'floor', label: '楼层', type: 'number' },
+      { key: 'capacity', label: '容量', type: 'number', required: true },
+      { key: 'roomType', label: '房型', type: 'string' },
+      { key: 'monthlyRate', label: '月租金', type: 'number' },
+    ],
+    relations: [
+      { entityKey: 'occupancy', via: 'occupancy', requiredFor: ['checkin'] },
+    ],
+  },
+  {
+    key: 'occupancy',
+    name: '入住记录',
+    description: '学生入住/换宿/退宿记录，费用与账单依赖入住状态。',
+    searchTool: 'get_room_occupancy_summary',
+    requiredPermissions: ['occupancy:view'],
+    fields: [
+      { key: 'studentId', label: '学生', type: 'number', required: true },
+      { key: 'roomId', label: '宿舍', type: 'number', required: true },
+      { key: 'checkInDate', label: '入住日期', type: 'date', required: true },
+      { key: 'billingStartDate', label: '计费开始日期', type: 'date', required: true },
+      { key: 'stayType', label: '住宿类型', type: 'enum', enumFrom: 'occupancy.stayType' },
+    ],
+    relations: [
+      { entityKey: 'student', via: 'occupancy', requiredFor: ['checkin'] },
+      { entityKey: 'room', via: 'occupancy', requiredFor: ['checkin'] },
+      { entityKey: 'bill', via: 'bill', requiredFor: ['bill'] },
+    ],
+  },
+  {
+    key: 'expense',
+    name: '费用',
+    description: '公共费用与个人费用，是生成账单的基础。',
+    searchTool: 'search_expenses',
+    requiredPermissions: ['expense:view'],
+    fields: [
+      { key: 'type', label: '费用类型', type: 'string', required: true },
+      { key: 'amount', label: '金额', type: 'number', required: true },
+      { key: 'periodStart', label: '费用开始日期', type: 'date' },
+      { key: 'periodEnd', label: '费用结束日期', type: 'date' },
+    ],
+    relations: [
+      { entityKey: 'occupancy', via: 'expense', requiredFor: ['expense'] },
+      { entityKey: 'bill', via: 'bill_item', requiredFor: ['bill'] },
+    ],
+  },
+  {
+    key: 'bill',
+    name: '账单',
+    description: '按学生与账期生成的账单（公共+个人费用分摊），支持确认与付款。',
+    searchTool: 'search_bills',
+    requiredPermissions: ['bill:view'],
+    fields: [
+      { key: 'studentId', label: '学生', type: 'number', required: true },
+      { key: 'periodStart', label: '账期开始', type: 'date', required: true },
+      { key: 'periodEnd', label: '账期结束', type: 'date', required: true },
+      { key: 'totalAmount', label: '总金额', type: 'number', required: true },
+      { key: 'status', label: '状态', type: 'enum', enumFrom: 'bill.status' },
+    ],
+    relations: [
+      { entityKey: 'student', via: 'bill', requiredFor: ['bill'] },
+      { entityKey: 'occupancy', via: 'bill', requiredFor: ['bill'] },
+      { entityKey: 'deposit', via: 'deposit', requiredFor: ['deposit'] },
+    ],
+  },
+  {
+    key: 'deposit',
+    name: '押金',
+    description: '押金收取与退还记录，通常在账单确认后处理。',
+    searchTool: 'search_deposits',
+    requiredPermissions: ['deposit:view'],
+    fields: [
+      { key: 'studentId', label: '学生', type: 'number', required: true },
+      { key: 'amount', label: '金额', type: 'number', required: true },
+      { key: 'status', label: '状态', type: 'enum', enumFrom: 'deposit.status' },
+    ],
+    relations: [
+      { entityKey: 'student', via: 'deposit', requiredFor: ['deposit'] },
+      { entityKey: 'bill', via: 'deposit', requiredFor: ['deposit'] },
+    ],
+  },
+  {
+    key: 'classroom',
+    name: '教室档案',
+    description: '教室基础档案，租赁与教室日程的前置数据。',
+    searchTool: 'search_classrooms',
+    requiredPermissions: ['classroom:view'],
+    fields: [
+      { key: 'name', label: '教室名称', type: 'string', required: true },
+      { key: 'building', label: '楼栋', type: 'string' },
+      { key: 'capacity', label: '容量', type: 'number' },
+    ],
+    relations: [
+      { entityKey: 'rental', via: 'classroom_rental', requiredFor: ['rental'] },
+      { entityKey: 'schedule', via: 'class_schedule', requiredFor: ['schedule'] },
+    ],
+  },
+  {
+    key: 'organization',
+    name: '组织/校区',
+    description: '校区与组织归属，租赁双方与档案归属依赖组织。',
+    requiredPermissions: ['organization:view'],
+    fields: [
+      { key: 'name', label: '名称', type: 'string', required: true },
+      { key: 'code', label: '编码', type: 'string' },
+      { key: 'isHost', label: '是否本部', type: 'boolean' },
+    ],
+    relations: [
+      { entityKey: 'student', via: 'organization', requiredFor: ['profile'] },
+      { entityKey: 'rental', via: 'classroom_rental', requiredFor: ['rental'] },
+    ],
+  },
+  {
+    key: 'rental',
+    name: '教室租赁',
+    description: '教室租赁订单与合同（合同字段在租赁记录上），依赖教室与组织。',
+    searchTool: 'search_classroom_rentals',
+    requiredPermissions: ['rental:view'],
+    fields: [
+      { key: 'classroomId', label: '教室', type: 'number', required: true },
+      { key: 'lesseeOrganizationId', label: '承租方', type: 'number' },
+      { key: 'startDate', label: '开始日期', type: 'date', required: true },
+      { key: 'endDate', label: '结束日期', type: 'date', required: true },
+      { key: 'dailyRate', label: '日租金', type: 'number' },
+      { key: 'contractPath', label: '合同文件', type: 'string' },
+    ],
+    relations: [
+      { entityKey: 'classroom', via: 'classroom_rental', requiredFor: ['rental'] },
+      { entityKey: 'organization', via: 'classroom_rental', requiredFor: ['rental'] },
+      { entityKey: 'schedule', via: 'class_schedule', requiredFor: ['schedule'] },
+    ],
+  },
+];
+
+export const BUSINESS_WORKFLOWS: readonly BusinessWorkflow[] = [
+  {
+    key: 'student_teaching',
+    name: '学生教学闭环',
+    description: '学生档案 → 分班 → 排课 → 考勤 → 考试/成绩。',
+    requiredPermissions: ['student:view'],
+    stages: [
+      { key: 'profile', label: '学生档案', entities: ['student'] },
+      { key: 'class', label: '分班', entities: ['class', 'student'] },
+      { key: 'schedule', label: '排课', entities: ['schedule', 'class'] },
+      { key: 'attendance', label: '考勤', entities: ['attendance', 'schedule', 'class'] },
+      { key: 'exam', label: '考试/成绩', entities: ['exam', 'class', 'student'] },
+    ],
+    prerequisites: {
+      class: ['profile'],
+      schedule: ['class'],
+      attendance: ['schedule'],
+      exam: ['class'],
+    },
+    nextSteps: [
+      { key: 'after_profile', label: '学生档案完成 → 建议分班', after: ['profile'] },
+      { key: 'after_class', label: '分班完成 → 建议排课', after: ['class'] },
+      { key: 'after_attendance', label: '考勤稳定 → 建议记录考试成绩', after: ['attendance'] },
+    ],
+  },
+  {
+    key: 'dormitory_billing',
+    name: '住宿计费闭环',
+    description: '学生/宿舍档案 → 入住 → 费用录入 → 生成账单 → 押金。',
+    requiredPermissions: ['occupancy:view'],
+    stages: [
+      { key: 'profile', label: '学生档案', entities: ['student'] },
+      { key: 'room', label: '宿舍档案', entities: ['room'] },
+      { key: 'checkin', label: '入住/换宿/退宿', entities: ['occupancy', 'student', 'room'] },
+      { key: 'expense', label: '费用录入', entities: ['expense', 'occupancy'] },
+      { key: 'bill', label: '生成账单', entities: ['bill', 'occupancy', 'expense'] },
+      { key: 'deposit', label: '押金', entities: ['deposit', 'bill', 'student'] },
+    ],
+    prerequisites: {
+      checkin: ['profile', 'room'],
+      expense: ['checkin'],
+      bill: ['checkin', 'expense'],
+      deposit: ['bill'],
+    },
+    nextSteps: [
+      { key: 'after_checkin', label: '入住完成 → 建议录入本月公共/个人费用', after: ['checkin'] },
+      { key: 'after_expense', label: '费用录入完成 → 建议生成并确认账单', after: ['expense'] },
+      { key: 'after_bill', label: '账单确认 → 建议标记已付并处理押金', after: ['bill'] },
+    ],
+  },
+  {
+    key: 'classroom_rental',
+    name: '教室租赁闭环',
+    description: '教室/组织档案 → 租赁订单 → 合同 → 教室日程。',
+    requiredPermissions: ['rental:view'],
+    stages: [
+      { key: 'classroom', label: '教室档案', entities: ['classroom'] },
+      { key: 'organization', label: '组织/校区', entities: ['organization'] },
+      { key: 'rental', label: '租赁订单', entities: ['rental', 'classroom', 'organization'] },
+      { key: 'contract', label: '合同', entities: ['rental'] },
+      { key: 'schedule', label: '教室日程', entities: ['schedule', 'classroom', 'rental'] },
+    ],
+    prerequisites: {
+      rental: ['classroom', 'organization'],
+      contract: ['rental'],
+      schedule: ['rental'],
+    },
+    nextSteps: [
+      { key: 'after_rental', label: '租赁订单生成 → 建议补充合同', after: ['rental'] },
+      { key: 'after_contract', label: '合同归档 → 建议排定教室日程', after: ['contract'] },
+    ],
+  },
+];
+
+export const BUSINESS_WORKFLOW_KEYS: readonly string[] = BUSINESS_WORKFLOWS.map(
+  (workflow) => workflow.key,
+);
diff --git a/apps/server/src/agent-context/business-context.service.spec.ts b/apps/server/src/agent-context/business-context.service.spec.ts
new file mode 100644
index 0000000..b8ecc3c
--- /dev/null
+++ b/apps/server/src/agent-context/business-context.service.spec.ts
@@ -0,0 +1,85 @@
+import { describe, expect, it } from '@jest/globals';
+import { BusinessContextService } from './business-context.service';
+
+function principal(permissions: string[] = [], isSuperAdmin = false) {
+  return { permissions, isSuperAdmin };
+}
+
+describe('BusinessContextService', () => {
+  it('registry 中所有工作流/实体/权限引用都有效', () => {
+    const service = new BusinessContextService();
+    expect(service.validateRegistry()).toEqual([]);
+    expect(() => service.assertValidRegistry()).not.toThrow();
+  });
+
+  it('超级管理员可查看全部工作流与实体', () => {
+    const service = new BusinessContextService();
+    const result = service.getBusinessContext(principal([], true));
+    expect(result.workflows.length).toBeGreaterThanOrEqual(3);
+    expect(result.entities.length).toBeGreaterThanOrEqual(10);
+    expect(result.workflows.map((item) => item.key)).toEqual(
+      expect.arrayContaining(['student_teaching', 'dormitory_billing', 'classroom_rental']),
+    );
+  });
+
+  it('按权限过滤实体，且只暴露有权限的工作流', () => {
+    const service = new BusinessContextService();
+    const result = service.getBusinessContext(principal(['student:view', 'class:view']));
+    const entityKeys = result.entities.map((item) => item.key);
+    expect(entityKeys).toContain('student');
+    expect(entityKeys).toContain('class');
+    expect(entityKeys).not.toContain('bill');
+    expect(result.workflows.map((item) => item.key)).toEqual(['student_teaching']);
+  });
+
+  it('workflowKey 聚焦时只返回对应工作流与实体', () => {
+    const service = new BusinessContextService();
+    const result = service.getBusinessContext(
+      principal(['room:view', 'occupancy:view', 'expense:view', 'bill:view', 'student:view'], false),
+      'dormitory_billing',
+    );
+    expect(result.workflows.map((item) => item.key)).toEqual(['dormitory_billing']);
+    expect(result.entities.map((item) => item.key)).toEqual(
+      expect.arrayContaining(['room', 'occupancy', 'expense', 'bill', 'student']),
+    );
+  });
+
+  it('未知或不可见 workflowKey 返回空结果', () => {
+    const service = new BusinessContextService();
+    expect(service.getBusinessContext(principal([], false), 'unknown_loop').workflows).toEqual([]);
+    expect(
+      service.getBusinessContext(principal(['student:view'], false), 'dormitory_billing').workflows,
+    ).toEqual([]);
+  });
+
+  it('getEntitySchema 返回字段字典与关系，未知/无权限实体返回 null', () => {
+    const service = new BusinessContextService();
+    const student = service.getEntitySchema(principal(['student:view']), 'student');
+    expect(student?.fields.map((field) => field.key)).toEqual(
+      expect.arrayContaining(['name', 'phone', 'gender', 'studentNo']),
+    );
+    expect(student?.relations.some((relation) => relation.entityKey === 'class')).toBe(true);
+    expect(service.getEntitySchema(principal(['student:view']), 'bill')).toBeNull();
+    expect(service.getEntitySchema(principal(['student:view']), 'unknown')).toBeNull();
+  });
+
+  it('suggestNextSteps 只返回已完成阶段对应的下一步建议', () => {
+    const service = new BusinessContextService();
+    const steps = service.suggestNextSteps(principal([], true), ['profile', 'checkin']);
+    const labels = steps.map((item) => item.label);
+    expect(labels).toEqual(
+      expect.arrayContaining([expect.stringContaining('费用')]),
+    );
+    expect(labels.some((item) => item.includes('账单'))).toBe(false);
+    expect(service.suggestNextSteps(principal([], true), ['profile']).some((item) => item.after.includes('checkin'))).toBe(false);
+    const afterExpense = service.suggestNextSteps(principal([], true), [
+      'profile',
+      'room',
+      'checkin',
+      'expense',
+    ]);
+    expect(afterExpense.map((item) => item.label)).toEqual(
+      expect.arrayContaining([expect.stringContaining('账单')]),
+    );
+  });
+});
diff --git a/apps/server/src/agent-context/business-context.service.ts b/apps/server/src/agent-context/business-context.service.ts
new file mode 100644
index 0000000..803e9d6
--- /dev/null
+++ b/apps/server/src/agent-context/business-context.service.ts
@@ -0,0 +1,180 @@
+import { Injectable } from '@nestjs/common';
+import {
+  BUSINESS_ENTITIES,
+  BUSINESS_WORKFLOWS,
+} from './business-context.registry';
+import type {
+  BusinessContextPrincipal,
+  BusinessContextResult,
+  BusinessEntity,
+  BusinessWorkflow,
+  BusinessWorkflowNextStep,
+} from './business-context.types';
+
+function hasPermission(
+  principal: BusinessContextPrincipal,
+  requiredPermissions: readonly string[],
+): boolean {
+  if (principal.isSuperAdmin) return true;
+  return requiredPermissions.some((permission) => principal.permissions.includes(permission));
+}
+
+/**
+ * 根据已完成阶段返回后续建议（按权限过滤），供 A2UI 提交回灌等场景直接使用。
+ */
+export function suggestNextStepsForPrincipal(
+  principal: BusinessContextPrincipal,
+  completedStageKeys: readonly string[],
+): BusinessWorkflowNextStep[] {
+  const completed = new Set(completedStageKeys);
+  const steps: BusinessWorkflowNextStep[] = [];
+  for (const workflow of BUSINESS_WORKFLOWS) {
+    if (!hasPermission(principal, workflow.requiredPermissions)) continue;
+    for (const step of workflow.nextSteps) {
+      if (!step.after.every((stageKey) => completed.has(stageKey))) continue;
+      if (step.permission && !hasPermission(principal, [step.permission])) continue;
+      steps.push(step);
+    }
+  }
+  return steps;
+}
+
+/**
+ * 业务上下文服务：把代码内维护的实体字典与工作流元数据按权限暴露给
+ * Agent（纯逻辑，不访问数据库）。
+ */
+@Injectable()
+export class BusinessContextService {
+  /**
+   * 校验注册表引用完整性，返回所有问题；空数组表示合法。
+   */
+  validateRegistry(): string[] {
+    const problems: string[] = [];
+    const entityKeys = new Set(BUSINESS_ENTITIES.map((entity) => entity.key));
+    const stageKeys = new Set(
+      BUSINESS_WORKFLOWS.flatMap((workflow) => workflow.stages.map((stage) => stage.key)),
+    );
+
+    const duplicateEntities = BUSINESS_ENTITIES
+      .map((entity) => entity.key)
+      .filter((key, index, all) => all.indexOf(key) !== index);
+    if (duplicateEntities.length) {
+      problems.push(`实体 key 重复: ${duplicateEntities.join(', ')}`);
+    }
+
+    for (const entity of BUSINESS_ENTITIES) {
+      if (!entity.name || !entity.description) {
+        problems.push(`实体 ${entity.key} 缺少 name/description`);
+      }
+      if (entity.requiredPermissions.length === 0) {
+        problems.push(`实体 ${entity.key} 缺少权限点`);
+      }
+      const fieldKeys = new Set<string>();
+      for (const field of entity.fields) {
+        if (fieldKeys.has(field.key)) {
+          problems.push(`实体 ${entity.key} 字段重复: ${field.key}`);
+        }
+        fieldKeys.add(field.key);
+        if (field.type === 'enum' && !field.enumFrom && !field.options) {
+          problems.push(`实体 ${entity.key} 枚举字段 ${field.key} 缺少 enumFrom/options`);
+        }
+      }
+      for (const relation of entity.relations) {
+        if (!entityKeys.has(relation.entityKey)) {
+          problems.push(`实体 ${entity.key} 关系引用未知实体: ${relation.entityKey}`);
+        }
+        for (const stageKey of relation.requiredFor) {
+          if (!stageKeys.has(stageKey)) {
+            problems.push(`实体 ${entity.key} 关系 ${relation.via} 引用未知阶段: ${stageKey}`);
+          }
+        }
+      }
+    }
+
+    for (const workflow of BUSINESS_WORKFLOWS) {
+      if (workflow.requiredPermissions.length === 0) {
+        problems.push(`工作流 ${workflow.key} 缺少权限点`);
+      }
+      const workflowStageKeys = new Set(workflow.stages.map((stage) => stage.key));
+      if (workflowStageKeys.size !== workflow.stages.length) {
+        problems.push(`工作流 ${workflow.key} 存在重复阶段`);
+      }
+      for (const stage of workflow.stages) {
+        for (const entityKey of stage.entities) {
+          if (!entityKeys.has(entityKey)) {
+            problems.push(`工作流 ${workflow.key} 阶段 ${stage.key} 引用未知实体: ${entityKey}`);
+          }
+        }
+      }
+      for (const [stageKey, prereqs] of Object.entries(workflow.prerequisites)) {
+        if (!workflowStageKeys.has(stageKey)) {
+          problems.push(`工作流 ${workflow.key} prerequisites 引用未知阶段: ${stageKey}`);
+        }
+        for (const prereq of prereqs) {
+          if (!workflowStageKeys.has(prereq)) {
+            problems.push(`工作流 ${workflow.key} 阶段 ${stageKey} 前置引用未知阶段: ${prereq}`);
+          }
+        }
+      }
+      for (const step of workflow.nextSteps) {
+        for (const afterKey of step.after) {
+          if (!workflowStageKeys.has(afterKey)) {
+            problems.push(`工作流 ${workflow.key} 下一步 ${step.key} 引用未知阶段: ${afterKey}`);
+          }
+        }
+      }
+    }
+
+    return [...new Set(problems)];
+  }
+
+  assertValidRegistry(): void {
+    const problems = this.validateRegistry();
+    if (problems.length > 0) {
+      throw new Error(`业务上下文注册表无效: ${problems.join('; ')}`);
+    }
+  }
+
+  /**
+   * 返回当前主体可见的工作流，以及这些工作流阶段引用的实体集合。
+   * 传 workflowKey 时只返回该工作流（不可见则返回空）。
+   */
+  getBusinessContext(
+    principal: BusinessContextPrincipal,
+    workflowKey?: string,
+  ): BusinessContextResult {
+    let workflows = BUSINESS_WORKFLOWS.filter((workflow) =>
+      hasPermission(principal, workflow.requiredPermissions),
+    );
+    if (workflowKey) {
+      workflows = workflows.filter((workflow) => workflow.key === workflowKey);
+    }
+    const entityKeys = new Set(
+      workflows.flatMap((workflow) => workflow.stages.flatMap((stage) => stage.entities)),
+    );
+    const entities = BUSINESS_ENTITIES.filter(
+      (entity) => entityKeys.has(entity.key) && hasPermission(principal, entity.requiredPermissions),
+    );
+    return { workflows, entities };
+  }
+
+  /** 返回指定实体的字段字典与关系；无权限或未知返回 null。 */
+  getEntitySchema(principal: BusinessContextPrincipal, entityKey: string): BusinessEntity | null {
+    const entity = BUSINESS_ENTITIES.find((item) => item.key === entityKey);
+    if (!entity || !hasPermission(principal, entity.requiredPermissions)) return null;
+    return entity;
+  }
+
+  /**
+   * 根据已完成阶段返回后续建议（按权限过滤）。
+   */
+  suggestNextSteps(
+    principal: BusinessContextPrincipal,
+    completedStageKeys: readonly string[],
+  ): BusinessWorkflowNextStep[] {
+    return suggestNextStepsForPrincipal(principal, completedStageKeys);
+  }
+}
+
+export { BUSINESS_ENTITIES, BUSINESS_WORKFLOWS };
+export type { BusinessContextPrincipal, BusinessWorkflow };
diff --git a/apps/server/src/agent-context/business-context.tools.spec.ts b/apps/server/src/agent-context/business-context.tools.spec.ts
new file mode 100644
index 0000000..df3c6cb
--- /dev/null
+++ b/apps/server/src/agent-context/business-context.tools.spec.ts
@@ -0,0 +1,73 @@
+import { describe, expect, it, jest } from '@jest/globals';
+import type { AgentToolContext } from '../agent-tools/agent-tool.types';
+import { AgentToolContextFactory } from '../agent-tools/agent-tool.types';
+import type { AuthenticatedUser } from '../authorization';
+import type { BusinessContextService } from './business-context.service';
+import { GetBusinessContextTool, GetEntitySchemaTool } from './get-business-context.tool';
+import { GetPendingTasksTool } from './get-pending-tasks.tool';
+
+function context(permissions: string[] = []): AgentToolContext {
+  const user: AuthenticatedUser = {
+    id: 7,
+    username: 'ops',
+    permissions,
+    isSuperAdmin: false,
+    roles: [],
+  };
+  return AgentToolContextFactory.fromAuthenticatedUser(user);
+}
+
+describe('agent business context tools', () => {
+  it('get_business_context 校验 workflowKey 并透传主体与过滤条件', async () => {
+    const service = {
+      getBusinessContext: jest.fn().mockReturnValue({ workflows: [], entities: [] }),
+    } as unknown as BusinessContextService;
+    const tool = new GetBusinessContextTool(service);
+    expect(tool.requiredPermission).toBe('ai:chat:use');
+    expect(tool.validate({ workflowKey: 123 }).ok).toBe(false);
+    expect(tool.validate({ workflowKey: 'x'.repeat(51) }).ok).toBe(false);
+    expect(tool.validate({ debug: true }).ok).toBe(false);
+    const parsed = tool.validate({ workflowKey: 'dormitory_billing' });
+    expect(parsed.ok).toBe(true);
+    if (!parsed.ok) return;
+    const ctx = context(['occupancy:view']);
+    await tool.execute(parsed.value, ctx);
+    expect(service.getBusinessContext).toHaveBeenCalledWith(
+      { permissions: ['occupancy:view'], isSuperAdmin: false },
+      'dormitory_billing',
+    );
+  });
+
+  it('get_entity_schema 必须提供存在的 entityKey', async () => {
+    const service = {
+      getEntitySchema: jest.fn().mockReturnValue({ key: 'student', name: '学生档案' }),
+    } as unknown as BusinessContextService;
+    const tool = new GetEntitySchemaTool(service);
+    expect(tool.validate({}).ok).toBe(false);
+    expect(tool.validate({ entityKey: '' }).ok).toBe(false);
+    expect(tool.validate({ entityKey: 'student', extra: 1 }).ok).toBe(false);
+    const parsed = tool.validate({ entityKey: 'student' });
+    expect(parsed.ok).toBe(true);
+    if (!parsed.ok) return;
+    await tool.execute(parsed.value, context());
+    expect(service.getEntitySchema).toHaveBeenCalledWith(
+      { permissions: [], isSuperAdmin: false },
+      'student',
+    );
+  });
+
+  it('get_pending_tasks 只接受已知工作流 key', async () => {
+    const service = {
+      getPendingTasks: jest.fn().mockResolvedValue([]),
+    };
+    const tool = new GetPendingTasksTool(service as never);
+    expect(tool.requiredPermission).toBe('ai:chat:use');
+    expect(tool.validate({ workflowKey: 'unknown_loop' }).ok).toBe(false);
+    expect(tool.validate({ workflowKey: 'dormitory_billing', limit: 1 }).ok).toBe(false);
+    const parsed = tool.validate({ workflowKey: 'dormitory_billing' });
+    expect(parsed.ok).toBe(true);
+    if (!parsed.ok) return;
+    await tool.execute(parsed.value, context(['bill:view']));
+    expect(service.getPendingTasks).toHaveBeenCalledWith(expect.anything(), 'dormitory_billing');
+  });
+});
diff --git a/apps/server/src/agent-context/business-context.types.ts b/apps/server/src/agent-context/business-context.types.ts
new file mode 100644
index 0000000..3b0b419
--- /dev/null
+++ b/apps/server/src/agent-context/business-context.types.ts
@@ -0,0 +1,66 @@
+/** 调用方主体验证（来自可信的 AgentToolContext / AuthenticatedUser）。 */
+export interface BusinessContextPrincipal {
+  readonly permissions: readonly string[];
+  readonly isSuperAdmin: boolean;
+}
+
+export type BusinessEntityFieldType = 'string' | 'number' | 'boolean' | 'date' | 'enum';
+
+export interface BusinessEntityField {
+  key: string;
+  label: string;
+  type: BusinessEntityFieldType;
+  required?: boolean;
+  /** 枚举值来源（如 gender、room.status），供 render_form 生成 options。 */
+  enumFrom?: string;
+  options?: Array<{ label: string; value: string }>;
+  description?: string;
+}
+
+export interface BusinessEntityRelation {
+  entityKey: string;
+  via: string;
+  /** 需要该关系已建立的工作流阶段 key。 */
+  requiredFor: string[];
+}
+
+export interface BusinessEntity {
+  key: string;
+  name: string;
+  description: string;
+  searchTool?: string;
+  requiredPermissions: readonly string[];
+  fields: readonly BusinessEntityField[];
+  relations: readonly BusinessEntityRelation[];
+}
+
+export interface BusinessWorkflowStage {
+  key: string;
+  label: string;
+  entities: readonly string[];
+}
+
+export interface BusinessWorkflowNextStep {
+  key: string;
+  label: string;
+  /** 满足这些阶段完成后才建议该步骤。 */
+  after: readonly string[];
+  /** 可选权限点，未授权用户不返回该建议。 */
+  permission?: string;
+}
+
+export interface BusinessWorkflow {
+  key: string;
+  name: string;
+  description: string;
+  requiredPermissions: readonly string[];
+  stages: readonly BusinessWorkflowStage[];
+  /** stageKey -> 前置阶段 key 列表。 */
+  prerequisites: Readonly<Record<string, readonly string[]>>;
+  nextSteps: readonly BusinessWorkflowNextStep[];
+}
+
+export interface BusinessContextResult {
+  workflows: readonly BusinessWorkflow[];
+  entities: readonly BusinessEntity[];
+}
diff --git a/apps/server/src/agent-context/get-business-context.tool.ts b/apps/server/src/agent-context/get-business-context.tool.ts
new file mode 100644
index 0000000..0a256fe
--- /dev/null
+++ b/apps/server/src/agent-context/get-business-context.tool.ts
@@ -0,0 +1,90 @@
+import { Injectable } from '@nestjs/common';
+import type { AgentToolContext, ToolDef, ToolInputResult } from '../agent-tools/agent-tool.types';
+import { rejectUnknownKeys, optionalString } from '../agent-tools/tools/tool-input';
+import type { BusinessContextService } from './business-context.service';
+
+interface GetBusinessContextInput {
+  workflowKey?: string;
+}
+
+/**
+ * 让 Agent 获取当前角色可见的业务流程、实体字典与依赖规则。
+ */
+@Injectable()
+export class GetBusinessContextTool implements ToolDef<GetBusinessContextInput> {
+  readonly name = 'get_business_context';
+  readonly skillKey = 'assistant';
+  readonly requiredPermission = 'ai:chat:use';
+  readonly description =
+    '获取当前账号可见的业务流程（学生教学/住宿计费/教室租赁）、实体字典、阶段依赖与下一步建议。写入或导入前先调用本工具确认前置数据要求。';
+  readonly inputSchema = {
+    type: 'object',
+    properties: {
+      workflowKey: {
+        type: 'string',
+        description: '可选：聚焦某个闭环（student_teaching / dormitory_billing / classroom_rental）',
+        maxLength: 50,
+      },
+    },
+    additionalProperties: false,
+  };
+
+  constructor(private readonly service: BusinessContextService) {}
+
+  validate(input: Record<string, unknown>): ToolInputResult<GetBusinessContextInput> {
+    const invalid = rejectUnknownKeys(input, ['workflowKey']);
+    if (invalid) return invalid;
+    const workflowKey = optionalString(input.workflowKey, 'workflowKey', 50);
+    if (!workflowKey.ok) return workflowKey;
+    return { ok: true, value: { workflowKey: workflowKey.value } };
+  }
+
+  async execute(input: GetBusinessContextInput, context: AgentToolContext): Promise<unknown> {
+    return this.service.getBusinessContext(
+      { permissions: context.permissions, isSuperAdmin: context.isSuperAdmin },
+      input.workflowKey,
+    );
+  }
+}
+
+/**
+ * 让 Agent 获取指定业务实体的字段字典与关系，用于生成准确表单。
+ */
+@Injectable()
+export class GetEntitySchemaTool implements ToolDef<{ entityKey: string }> {
+  readonly name = 'get_entity_schema';
+  readonly skillKey = 'assistant';
+  readonly requiredPermission = 'ai:chat:use';
+  readonly description =
+    '获取指定业务实体（student/class/room/occupancy/expense/bill/deposit/classroom/organization/rental 等）的字段字典、枚举来源与关系，render_form 前可按需调用以生成正确字段。';
+  readonly inputSchema = {
+    type: 'object',
+    properties: {
+      entityKey: { type: 'string', minLength: 1, maxLength: 50 },
+    },
+    required: ['entityKey'],
+    additionalProperties: false,
+  };
+
+  constructor(private readonly service: BusinessContextService) {}
+
+  validate(input: Record<string, unknown>): ToolInputResult<{ entityKey: string }> {
+    const invalid = rejectUnknownKeys(input, ['entityKey']);
+    if (invalid) return invalid;
+    if (typeof input.entityKey !== 'string' || !input.entityKey.trim()) {
+      return { ok: false, error: 'entityKey 必须是字符串' };
+    }
+    const entityKey = input.entityKey.trim();
+    if (entityKey.length > 50) {
+      return { ok: false, error: 'entityKey 长度不能超过 50' };
+    }
+    return { ok: true, value: { entityKey } };
+  }
+
+  async execute(input: { entityKey: string }, context: AgentToolContext): Promise<unknown> {
+    return this.service.getEntitySchema(
+      { permissions: context.permissions, isSuperAdmin: context.isSuperAdmin },
+      input.entityKey,
+    );
+  }
+}
diff --git a/apps/server/src/agent-context/get-pending-tasks.tool.ts b/apps/server/src/agent-context/get-pending-tasks.tool.ts
new file mode 100644
index 0000000..1f68b97
--- /dev/null
+++ b/apps/server/src/agent-context/get-pending-tasks.tool.ts
@@ -0,0 +1,52 @@
+import { Injectable } from '@nestjs/common';
+import type { AgentToolContext, ToolDef, ToolInputResult } from '../agent-tools/agent-tool.types';
+import { rejectUnknownKeys } from '../agent-tools/tools/tool-input';
+import { BUSINESS_WORKFLOW_KEYS } from './business-context.registry';
+import type { PendingTasksService } from './pending-tasks.service';
+
+interface GetPendingTasksInput {
+  workflowKey?: string;
+}
+
+/**
+ * 让 Agent 查询业务完成度（未分班、未入住、未出账单、临期租赁等），
+ * 用于核实前置数据与给出有数据支撑的下一步建议。
+ */
+@Injectable()
+export class GetPendingTasksTool implements ToolDef<GetPendingTasksInput> {
+  readonly name = 'get_pending_tasks';
+  readonly skillKey = 'overview';
+  readonly requiredPermission = 'ai:chat:use';
+  readonly description =
+    '获取当前账号可见范围内的业务待办计数（未分班学生、已建档未入住学生、在住未生成账单、租赁缺合同/临期到期等）。写入或导入前用它核实前置数据是否齐备，完成后用它判断后续待办。';
+  readonly inputSchema = {
+    type: 'object',
+    properties: {
+      workflowKey: {
+        type: 'string',
+        description: '可选：聚焦某个闭环（student_teaching / dormitory_billing / classroom_rental）',
+        enum: [...BUSINESS_WORKFLOW_KEYS],
+      },
+    },
+    additionalProperties: false,
+  };
+
+  constructor(private readonly service: PendingTasksService) {}
+
+  validate(input: Record<string, unknown>): ToolInputResult<GetPendingTasksInput> {
+    const invalid = rejectUnknownKeys(input, ['workflowKey']);
+    if (invalid) return invalid;
+    if (input.workflowKey === undefined) return { ok: true, value: {} };
+    if (
+      typeof input.workflowKey !== 'string' ||
+      !(BUSINESS_WORKFLOW_KEYS as readonly string[]).includes(input.workflowKey)
+    ) {
+      return { ok: false, error: `workflowKey 必须是 ${BUSINESS_WORKFLOW_KEYS.join(' / ')} 之一` };
+    }
+    return { ok: true, value: { workflowKey: input.workflowKey } };
+  }
+
+  execute(input: GetPendingTasksInput, context: AgentToolContext): Promise<unknown> {
+    return this.service.getPendingTasks(context, input.workflowKey);
+  }
+}
diff --git a/apps/server/src/agent-context/index.ts b/apps/server/src/agent-context/index.ts
new file mode 100644
index 0000000..88564af
--- /dev/null
+++ b/apps/server/src/agent-context/index.ts
@@ -0,0 +1,12 @@
+export { BusinessContextService } from './business-context.service';
+export { BUSINESS_ENTITIES, BUSINESS_WORKFLOWS } from './business-context.registry';
+export type {
+  BusinessContextPrincipal,
+  BusinessContextResult,
+  BusinessEntity,
+  BusinessEntityField,
+  BusinessEntityRelation,
+  BusinessWorkflow,
+  BusinessWorkflowNextStep,
+  BusinessWorkflowStage,
+} from './business-context.types';
diff --git a/apps/server/src/agent-context/pending-tasks.service.spec.ts b/apps/server/src/agent-context/pending-tasks.service.spec.ts
new file mode 100644
index 0000000..fa54f15
--- /dev/null
+++ b/apps/server/src/agent-context/pending-tasks.service.spec.ts
@@ -0,0 +1,103 @@
+import { describe, expect, it, jest } from '@jest/globals';
+import type { DataSource } from 'typeorm';
+import { AgentToolContextFactory, type AgentToolContext } from '../agent-tools/agent-tool.types';
+import type { AuthenticatedUser } from '../authorization';
+import type { StudentAccessScopeFactory } from '../students/student-access-scope.factory';
+import { PendingTasksService } from './pending-tasks.service';
+
+function context(permissions: string[], isSuperAdmin = false): AgentToolContext {
+  const user: AuthenticatedUser = {
+    id: 7,
+    username: 'ops',
+    permissions,
+    isSuperAdmin,
+    roles: [],
+  };
+  return AgentToolContextFactory.fromAuthenticatedUser(user);
+}
+
+function createService(
+  scopeType: 'manageAll' | 'teacher',
+  queryMock: jest.Mock<Promise<Array<Record<string, unknown>>>>,
+) {
+  const dataSource = { query: queryMock } as unknown as DataSource;
+  const scopeFactory = {
+    buildScope: jest.fn().mockReturnValue(
+      scopeType === 'manageAll'
+        ? { type: 'manageAll' }
+        : { type: 'teacher', userId: 7 },
+    ),
+  } as unknown as StudentAccessScopeFactory;
+  return new PendingTasksService(dataSource, scopeFactory);
+}
+
+const ROW = (cnt: unknown) => [{ cnt }] as Record<string, unknown>[];
+
+describe('PendingTasksService', () => {
+  it('manageAll 权限下返回全部待办计数', async () => {
+    const query = jest.fn().mockImplementation(async (sql: string) => {
+      if (sql.includes('NOT EXISTS') && sql.includes('class_student')) return ROW('3');
+      if (sql.includes('LEFT JOIN occupancies o')) return ROW('5');
+      if (sql.includes('FROM occupancies o')) return ROW('8');
+      if (sql.includes('classroom_rentals r') && sql.includes('contract_path IS NULL')) return ROW('2');
+      if (sql.includes('classroom_rentals r') && sql.includes('end_date BETWEEN')) return ROW('4');
+      return ROW('0');
+    });
+    const service = createService('manageAll', query);
+    const tasks = await service.getPendingTasks(
+      context([
+        'student:view',
+        'class:view',
+        'occupancy:view',
+        'bill:view',
+        'rental:view',
+      ]),
+    );
+    const byKey = Object.fromEntries(tasks.map((task) => [task.key, task]));
+    expect(byKey.students_without_class?.count).toBe(3);
+    expect(byKey.students_without_checkin?.count).toBe(5);
+    expect(byKey.occupancies_without_bill?.count).toBe(8);
+    expect(byKey.rentals_without_contract?.count).toBe(2);
+    expect(byKey.rentals_ending_soon?.count).toBe(4);
+    expect(byKey.students_without_class?.restricted).toBeUndefined();
+  });
+
+  it('teacher 范围只统计本人班级学生，且未分班任务标记 restricted', async () => {
+    const query = jest.fn().mockImplementation(async (sql: string, params: unknown[]) => {
+      expect(sql).toContain('cs.class_id IN');
+      expect(params).toEqual([7]);
+      if (sql.includes('LEFT JOIN occupancies o')) return ROW('2');
+      if (sql.includes('FROM occupancies o')) return ROW('1');
+      return ROW('0');
+    });
+    const service = createService('teacher', query);
+    const tasks = await service.getPendingTasks(
+      context(['student:view', 'occupancy:view', 'bill:view']),
+    );
+    const byKey = Object.fromEntries(tasks.map((task) => [task.key, task]));
+    expect(byKey.students_without_class).toMatchObject({ count: null, restricted: true });
+    expect(byKey.students_without_checkin?.count).toBe(2);
+    expect(byKey.occupancies_without_bill?.count).toBe(1);
+    expect(byKey.rentals_without_contract).toBeUndefined();
+  });
+
+  it('workflowKey 只返回该闭环的待办', async () => {
+    const query = jest.fn().mockResolvedValue(ROW('0'));
+    const service = createService('manageAll', query);
+    const tasks = await service.getPendingTasks(
+      context([], true),
+      'classroom_rental',
+    );
+    expect(tasks.map((task) => task.key)).toEqual([
+      'rentals_without_contract',
+      'rentals_ending_soon',
+    ]);
+  });
+
+  it('缺少权限的任务不返回', async () => {
+    const query = jest.fn().mockResolvedValue(ROW('0'));
+    const service = createService('manageAll', query);
+    const tasks = await service.getPendingTasks(context(['student:view']));
+    expect(tasks.map((task) => task.key)).toEqual(['students_without_class']);
+  });
+});
diff --git a/apps/server/src/agent-context/pending-tasks.service.ts b/apps/server/src/agent-context/pending-tasks.service.ts
new file mode 100644
index 0000000..41db622
--- /dev/null
+++ b/apps/server/src/agent-context/pending-tasks.service.ts
@@ -0,0 +1,183 @@
+import { Injectable } from '@nestjs/common';
+import type { DataSource } from 'typeorm';
+import type { AgentToolContext } from '../agent-tools/agent-tool.types';
+import type { StudentAccessScope } from '../students/student-access-scope';
+import { StudentAccessScopeFactory } from '../students/student-access-scope.factory';
+
+export interface PendingTask {
+  key: string;
+  label: string;
+  entity: string;
+  permission: string;
+  workflowKeys: string[];
+  count: number | null;
+  restricted?: boolean;
+  detail?: string;
+}
+
+interface TaskDefinition {
+  key: string;
+  label: string;
+  entity: string;
+  permission: string;
+  workflowKeys: string[];
+  teacherRestricted?: boolean;
+  sql: (scope: StudentAccessScope) => { sql: string; params: unknown[] };
+}
+
+function can(context: AgentToolContext, permission: string): boolean {
+  return context.isSuperAdmin || context.permissions.includes(permission);
+}
+
+function today(): string {
+  const now = new Date();
+  const year = now.getFullYear();
+  const month = String(now.getMonth() + 1).padStart(2, '0');
+  const day = String(now.getDate()).padStart(2, '0');
+  return `${year}-${month}-${day}`;
+}
+
+function inDays(days: number): string {
+  const date = new Date();
+  date.setDate(date.getDate() + days);
+  const year = date.getFullYear();
+  const month = String(date.getMonth() + 1).padStart(2, '0');
+  const day = String(date.getDate()).padStart(2, '0');
+  return `${year}-${month}-${day}`;
+}
+
+const TASKS: readonly TaskDefinition[] = [
+  {
+    key: 'students_without_class',
+    label: '未分班学生',
+    entity: 'student',
+    permission: 'student:view',
+    workflowKeys: ['student_teaching'],
+    teacherRestricted: true,
+    sql: () => ({
+      sql: `
+        SELECT COUNT(*) AS cnt FROM students s
+        WHERE s.status = 'active'
+          AND NOT EXISTS (
+            SELECT 1 FROM class_student cs
+            WHERE cs.student_id = s.id AND cs.status = 'active'
+          )
+      `,
+      params: [],
+    }),
+  },
+  {
+    key: 'students_without_checkin',
+    label: '已建档未入住学生',
+    entity: 'occupancy',
+    permission: 'occupancy:view',
+    workflowKeys: ['dormitory_billing'],
+    sql: (scope) => ({
+      sql: `
+        SELECT COUNT(DISTINCT s.id) AS cnt FROM students s
+        INNER JOIN class_student cs ON cs.student_id = s.id AND cs.status = 'active'
+        LEFT JOIN occupancies o ON o.student_id = s.id AND o.status = 'active'
+        WHERE s.status = 'active'
+          ${scope.type === 'teacher' ? 'AND cs.class_id IN (SELECT ct.class_id FROM class_teacher ct WHERE ct.user_id = ?)' : ''}
+          AND o.id IS NULL
+      `,
+      params: scope.type === 'teacher' ? [scope.userId] : [],
+    }),
+  },
+  {
+    key: 'occupancies_without_bill',
+    label: '在住但未生成账单',
+    entity: 'bill',
+    permission: 'bill:view',
+    workflowKeys: ['dormitory_billing'],
+    sql: (scope) => ({
+      sql: `
+        SELECT COUNT(DISTINCT o.id) AS cnt FROM occupancies o
+        ${scope.type === 'teacher' ? 'INNER JOIN class_student cs ON cs.student_id = o.student_id AND cs.status = \'active\'' : ''}
+        LEFT JOIN bills b ON b.student_id = o.student_id
+        WHERE o.status = 'active'
+          ${scope.type === 'teacher' ? 'AND cs.class_id IN (SELECT ct.class_id FROM class_teacher ct WHERE ct.user_id = ?)' : ''}
+          AND b.id IS NULL
+      `,
+      params: scope.type === 'teacher' ? [scope.userId] : [],
+    }),
+  },
+  {
+    key: 'rentals_without_contract',
+    label: '租赁未归档合同',
+    entity: 'rental',
+    permission: 'rental:view',
+    workflowKeys: ['classroom_rental'],
+    sql: () => ({
+      sql: `
+        SELECT COUNT(*) AS cnt FROM classroom_rentals r
+        WHERE r.status = 'active' AND r.contract_path IS NULL
+      `,
+      params: [],
+    }),
+  },
+  {
+    key: 'rentals_ending_soon',
+    label: '七天内到期租赁',
+    entity: 'rental',
+    permission: 'rental:view',
+    workflowKeys: ['classroom_rental'],
+    sql: () => ({
+      sql: `
+        SELECT COUNT(*) AS cnt FROM classroom_rentals r
+        WHERE r.status = 'active' AND r.end_date BETWEEN ? AND ?
+      `,
+      params: [today(), inDays(7)],
+    }),
+  },
+];
+
+/**
+ * 业务完成度查询：按权限与数据范围返回“待办”计数，供 Agent 在
+ * 写入/导入前核实前置数据、完成后给出有数据支撑的下一步建议。
+ */
+@Injectable()
+export class PendingTasksService {
+  constructor(
+    private readonly dataSource: DataSource,
+    private readonly scopeFactory: StudentAccessScopeFactory,
+  ) {}
+
+  async getPendingTasks(
+    context: AgentToolContext,
+    workflowKey?: string,
+  ): Promise<PendingTask[]> {
+    const scope = this.scopeFactory.buildScope(context);
+    const tasks: PendingTask[] = [];
+    for (const definition of TASKS) {
+      if (!can(context, definition.permission)) continue;
+      if (workflowKey && !definition.workflowKeys.includes(workflowKey)) continue;
+      if (definition.teacherRestricted && scope.type === 'teacher') {
+        tasks.push({
+          key: definition.key,
+          label: definition.label,
+          entity: definition.entity,
+          permission: definition.permission,
+          workflowKeys: definition.workflowKeys,
+          count: null,
+          restricted: true,
+          detail: '当前角色数据范围不适合统计该待办，建议由教务/运营角色处理',
+        });
+        continue;
+      }
+      const { sql, params } = definition.sql(scope);
+      const rows = await this.dataSource.query(sql, params);
+      const count = Number((rows as Array<Record<string, unknown>>)[0]?.cnt ?? 0);
+      tasks.push({
+        key: definition.key,
+        label: definition.label,
+        entity: definition.entity,
+        permission: definition.permission,
+        workflowKeys: definition.workflowKeys,
+        count,
+      });
+    }
+    return tasks;
+  }
+
+}
diff --git a/apps/server/src/agent-tools/agent-skill.catalog.ts b/apps/server/src/agent-tools/agent-skill.catalog.ts
index dbeab4b..a956ec1 100644
--- a/apps/server/src/agent-tools/agent-skill.catalog.ts
+++ b/apps/server/src/agent-tools/agent-skill.catalog.ts
@@ -4,8 +4,8 @@ export const AGENT_SKILLS: readonly Omit<AgentSkillDescriptor, 'tools'>[] = [
   {
     key: 'overview',
     name: '经营总览',
-    description: '查看当前权限范围内的学生、班级和今日考勤概览。',
-    examples: ['今天整体运营情况怎么样？', '帮我汇总当前学生和班级数量'],
+    description: '查看当前权限范围内的学生、班级和今日考勤概览，以及业务待办（未分班、未入住、未出账单、临期租赁等）。',
+    examples: ['今天整体运营情况怎么样？', '有哪些业务待办需要处理？', '帮我汇总当前学生和班级数量'],
   },
   {
     key: 'student',
@@ -22,20 +22,20 @@ export const AGENT_SKILLS: readonly Omit<AgentSkillDescriptor, 'tools'>[] = [
   {
     key: 'dormitory',
     name: '宿舍管理',
-    description: '查询宿舍、入住数量和空余床位。',
-    examples: ['哪些房间还有空床？', '汇总当前宿舍入住情况'],
+    description: '查询宿舍、入住数量和空余床位，并按“学生/宿舍档案 → 入住 → 费用 → 账单 → 押金”闭环引导。',
+    examples: ['哪些房间还有空床？', '汇总当前宿舍入住情况', '我可以按 先学生、再入住、后账单 帮你完成'],
   },
   {
     key: 'billing',
     name: '账单查询',
-    description: '查询账单编号、账期、金额和状态。',
-    examples: ['查找本月未支付账单', '查询张同学最近的账单'],
+    description: '查询账单编号、账期、金额和状态，并在入住/费用完成后建议生成与确认账单。',
+    examples: ['查找本月未支付账单', '查询张同学最近的账单', '哪些在住学生还没生成账单？'],
   },
   {
     key: 'classroom',
     name: '教室与租用',
-    description: '查询教室信息、占用状态和租赁订单。',
-    examples: ['哪些教室空闲？', '本月教室租赁订单有哪些？'],
+    description: '查询教室信息、占用状态和租赁订单，并按“教室/组织档案 → 租赁 → 合同 → 日程”闭环引导。',
+    examples: ['哪些教室空闲？', '本月教室租赁订单有哪些？', '哪些租赁还没归档合同？'],
   },
   {
     key: 'sync',
diff --git a/apps/server/src/agent-tools/agent-tools.module.ts b/apps/server/src/agent-tools/agent-tools.module.ts
index 9afde4f..872a740 100644
--- a/apps/server/src/agent-tools/agent-tools.module.ts
+++ b/apps/server/src/agent-tools/agent-tools.module.ts
@@ -32,6 +32,10 @@ import { ExpensesModule } from '../expenses/expenses.module';
 import { ClassroomsModule } from '../classrooms/classrooms.module';
 import { ClassroomRentalsModule } from '../classroom-rentals/classroom-rentals.module';
 import { SyncModule } from '../sync/sync.module';
+import { BusinessContextService } from '../agent-context/business-context.service';
+import { PendingTasksService } from '../agent-context/pending-tasks.service';
+import { GetBusinessContextTool, GetEntitySchemaTool } from '../agent-context/get-business-context.tool';
+import { GetPendingTasksTool } from '../agent-context/get-pending-tasks.tool';
 
 /**
  * Agent Tools feature module.
@@ -66,6 +70,11 @@ import { SyncModule } from '../sync/sync.module';
   providers: [
     AgentToolRegistry,
     AgentToolExecutor,
+    BusinessContextService,
+    PendingTasksService,
+    GetBusinessContextTool,
+    GetEntitySchemaTool,
+    GetPendingTasksTool,
     SearchStudentsTool,
     GetStudentBasicTool,
     AgentBusinessScopeFactory,
@@ -107,9 +116,15 @@ export class AgentToolsModule implements OnModuleInit {
     private readonly searchClassroomsTool: SearchClassroomsTool,
     private readonly searchClassroomRentalsTool: SearchClassroomRentalsTool,
     private readonly getSyncStatusTool: GetSyncStatusTool,
+    private readonly businessContextTool: GetBusinessContextTool,
+    private readonly entitySchemaTool: GetEntitySchemaTool,
+    private readonly pendingTasksTool: GetPendingTasksTool,
   ) {}
 
   onModuleInit(): void {
+    this.registry.register(this.businessContextTool);
+    this.registry.register(this.entitySchemaTool);
+    this.registry.register(this.pendingTasksTool);
     this.registry.register(this.searchTool);
     this.registry.register(this.getTool);
     this.registry.register(this.searchClassesTool);
diff --git a/apps/server/src/ai-chat/ai-a2ui-submissions.service.spec.ts b/apps/server/src/ai-chat/ai-a2ui-submissions.service.spec.ts
new file mode 100644
index 0000000..560439f
--- /dev/null
+++ b/apps/server/src/ai-chat/ai-a2ui-submissions.service.spec.ts
@@ -0,0 +1,69 @@
+import { describe, expect, it, jest } from '@jest/globals';
+import { A2uiSubmissionsService } from './ai-a2ui-submissions.service';
+
+function createService(overrides: Record<string, unknown> = {}) {
+  const repo = {
+    findOne: jest.fn(),
+    save: jest.fn(async (value) => value),
+    create: jest.fn((value) => value),
+    ...overrides,
+  };
+  return { service: new A2uiSubmissionsService(repo as never), repo };
+}
+
+const submission = {
+  id: 1,
+  artifactId: 'form-1',
+  clientRequestId: '4d5c1c2a-1111-4222-8333-444455556666',
+  status: 'created',
+  resultJson: '{"ok":true}',
+  createdAt: new Date(),
+};
+
+describe('A2uiSubmissionsService', () => {
+  it('recordSubmission 首次提交创建记录并标记 created', async () => {
+    const { service, repo } = createService({
+      findOne: jest.fn().mockResolvedValue(null),
+    });
+    const result = await service.recordSubmission({
+      artifactId: submission.artifactId,
+      clientRequestId: submission.clientRequestId,
+      status: 'created',
+      resultJson: submission.resultJson,
+    });
+    expect(result.created).toBe(true);
+    expect(repo.save).toHaveBeenCalledWith(
+      expect.objectContaining({
+        artifactId: submission.artifactId,
+        clientRequestId: submission.clientRequestId,
+      }),
+    );
+  });
+
+  it('recordSubmission 同一 clientRequestId 重复提交返回既有记录且不重复创建', async () => {
+    const { service, repo } = createService({
+      findOne: jest.fn().mockResolvedValue(submission),
+    });
+    const result = await service.recordSubmission({
+      artifactId: submission.artifactId,
+      clientRequestId: submission.clientRequestId,
+      status: 'created',
+      resultJson: '{"ok":false}',
+    });
+    expect(result.created).toBe(false);
+    expect(result.submission).toEqual(submission);
+    expect(repo.save).not.toHaveBeenCalled();
+  });
+
+  it('findSubmission 透传查询条件', async () => {
+    const { service, repo } = createService({
+      findOne: jest.fn().mockResolvedValue(submission),
+    });
+    await expect(
+      service.findSubmission(submission.artifactId, submission.clientRequestId),
+    ).resolves.toEqual(submission);
+    expect(repo.findOne).toHaveBeenCalledWith({
+      where: { artifactId: submission.artifactId, clientRequestId: submission.clientRequestId },
+    });
+  });
+});
diff --git a/apps/server/src/ai-chat/ai-a2ui-submissions.service.ts b/apps/server/src/ai-chat/ai-a2ui-submissions.service.ts
new file mode 100644
index 0000000..ad2a706
--- /dev/null
+++ b/apps/server/src/ai-chat/ai-a2ui-submissions.service.ts
@@ -0,0 +1,48 @@
+import { Injectable } from '@nestjs/common';
+import { InjectRepository } from '@nestjs/typeorm';
+import { Repository } from 'typeorm';
+import { AiA2uiSubmission } from './entities/ai-a2ui-submission.entity';
+
+export interface RecordSubmissionInput {
+  artifactId: string;
+  clientRequestId: string;
+  status: string;
+  resultJson?: string | null;
+}
+
+/**
+ * A2UI 提交幂等服务。
+ */
+@Injectable()
+export class A2uiSubmissionsService {
+  constructor(
+    @InjectRepository(AiA2uiSubmission)
+    private readonly submissions: Repository<AiA2uiSubmission>,
+  ) {}
+
+  async recordSubmission(input: RecordSubmissionInput): Promise<{
+    created: boolean;
+    submission: AiA2uiSubmission;
+  }> {
+    const existing = await this.findSubmission(input.artifactId, input.clientRequestId);
+    if (existing) return { created: false, submission: existing };
+    const submission = await this.submissions.save(
+      this.submissions.create({
+        artifactId: input.artifactId,
+        clientRequestId: input.clientRequestId,
+        status: input.status,
+        resultJson: input.resultJson ?? null,
+      }),
+    );
+    return { created: true, submission };
+  }
+
+  async findSubmission(
+    artifactId: string,
+    clientRequestId: string,
+  ): Promise<AiA2uiSubmission | null> {
+    return this.submissions.findOne({
+      where: { artifactId, clientRequestId },
+    });
+  }
+}
diff --git a/apps/server/src/ai-chat/ai-a2ui.artifact.spec.ts b/apps/server/src/ai-chat/ai-a2ui.artifact.spec.ts
new file mode 100644
index 0000000..daf460f
--- /dev/null
+++ b/apps/server/src/ai-chat/ai-a2ui.artifact.spec.ts
@@ -0,0 +1,36 @@
+import { describe, expect, it } from '@jest/globals';
+import { buildA2uiArtifact } from './ai-a2ui.artifact';
+
+describe('buildA2uiArtifact', () => {
+  it('构造统一 artifact 载荷（id/type/status/messageId/conversationId/payload）', () => {
+    const artifact = buildA2uiArtifact({
+      type: 'form',
+      id: 'form-1',
+      status: 'pending',
+      messageId: 12,
+      conversationId: 3,
+      payload: { title: '新增学生' },
+    });
+    expect(artifact).toEqual({
+      id: 'form-1',
+      type: 'form',
+      status: 'pending',
+      messageId: 12,
+      conversationId: 3,
+      payload: { title: '新增学生' },
+    });
+  });
+
+  it('未知类型被拒绝', () => {
+    expect(() =>
+      buildA2uiArtifact({
+        type: 'hacker' as never,
+        id: 'x',
+        status: 'pending',
+        messageId: 1,
+        conversationId: 1,
+        payload: {},
+      }),
+    ).toThrow();
+  });
+});
diff --git a/apps/server/src/ai-chat/ai-a2ui.artifact.ts b/apps/server/src/ai-chat/ai-a2ui.artifact.ts
new file mode 100644
index 0000000..11689fd
--- /dev/null
+++ b/apps/server/src/ai-chat/ai-a2ui.artifact.ts
@@ -0,0 +1,58 @@
+export type A2uiArtifactType =
+  | 'form'
+  | 'review'
+  | 'chart'
+  | 'import_preflight'
+  | 'import_wizard';
+
+export type A2uiArtifactStatus = 'rendering' | 'pending' | 'submitted' | 'expired' | 'cancelled';
+
+export interface A2uiArtifact<T = unknown> {
+  id: string;
+  type: A2uiArtifactType;
+  status: A2uiArtifactStatus;
+  messageId: number;
+  conversationId: number;
+  payload: T;
+  createdAt?: string | null;
+  submittedAt?: string | null;
+  supersededBy?: string | null;
+}
+
+const A2UI_ARTIFACT_TYPES = new Set<A2uiArtifactType>([
+  'form',
+  'review',
+  'chart',
+  'import_preflight',
+  'import_wizard',
+]);
+
+/**
+ * 构造统一的 A2UI artifact 载荷，供 `ui.artifact` SSE 事件与前端归一化。
+ */
+export function buildA2uiArtifact<T>(input: {
+  type: A2uiArtifactType;
+  id: string;
+  status: A2uiArtifactStatus;
+  messageId: number;
+  conversationId: number;
+  payload: T;
+  createdAt?: string | null;
+  submittedAt?: string | null;
+  supersededBy?: string | null;
+}): A2uiArtifact<T> {
+  if (!A2UI_ARTIFACT_TYPES.has(input.type)) {
+    throw new Error(`未知 A2UI artifact 类型: ${String(input.type)}`);
+  }
+  return {
+    id: input.id,
+    type: input.type,
+    status: input.status,
+    messageId: input.messageId,
+    conversationId: input.conversationId,
+    payload: input.payload,
+    ...(input.createdAt !== undefined ? { createdAt: input.createdAt } : {}),
+    ...(input.submittedAt !== undefined ? { submittedAt: input.submittedAt } : {}),
+    ...(input.supersededBy !== undefined ? { supersededBy: input.supersededBy } : {}),
+  };
+}
diff --git a/apps/server/src/ai-chat/ai-chat.constants.ts b/apps/server/src/ai-chat/ai-chat.constants.ts
index 746366f..5afa881 100644
--- a/apps/server/src/ai-chat/ai-chat.constants.ts
+++ b/apps/server/src/ai-chat/ai-chat.constants.ts
@@ -107,7 +107,7 @@ export const A2UI_TOOL_SCHEMAS = [
     function: {
       name: 'render_form',
       description:
-        '生成一个确认表单显示给用户填写。当用户需要新增或修改业务数据、或需要用户输入/确认信息时调用；用户提交表单后才能执行写操作。',
+        '生成一个确认表单显示给用户填写。当用户需要新增或修改业务数据、或需要用户输入/确认信息时调用；用户提交表单后才能执行写操作。需要准确字段/枚举时，可先调用 get_entity_schema 获取实体字段字典。',
       parameters: {
         type: 'object',
         properties: {
@@ -211,9 +211,10 @@ export const SYSTEM_PROMPT = `你是恭学系统的业务助理。回答必须
 当用户需要可视化数据（趋势、占比、对比、多维、完成率等）时，调用 render_chart 生成图表卡片（chartType 支持 line 折线/bar 柱状/pie 饼图/area 面积/scatter 散点/radar 雷达/gauge 仪表盘/funnel 漏斗，columns+rows 表格数据）。
 上传的 Office 附件：上传时系统已自动提取附件文本并随消息提供（Excel 为“工作表名 + tab 分隔行”的文本，Word/PPT 为提取的文本），直接基于这些文本核对表头与数据、回答用户问题即可；没有单独的附件解析工具，不需要（也无法）主动读取附件原始文件。批量导入前如不确定列名，先调用 preflight_import（内部会解析文件并给出列映射、分阶段统计与错误样本），再向用户确认并生成导入向导。
 业务工作流引导（重要）：
-- 系统业务按“基础档案 → 业务关系 → 运行数据 → 结算”组织。常见闭环：学生、宿舍、教室、组织等基础档案先行；再建立分班、入住、租赁等关系；之后才有考勤、费用等运行数据；最后生成账单、押金等结算。
-- 执行任何写入或导入前，先判断该操作依赖的前置数据是否已存在（可用查询工具核实）：入住依赖学生和宿舍，换宿依赖学生和宿舍，账单依赖入住记录和费用，考勤依赖班级和排课。前置缺失时，先向用户说明缺什么、建议先完成哪一步，再继续，不要机械地跳过依赖直接入库。
-- 导入或录入完成后，主动给出下一步建议（例如：入住导入完成 → 建议录入本月公共费用 → 生成并确认账单；学生导入完成 → 建议分班或排课）。
+- 系统业务按“基础档案 → 业务关系 → 运行数据 → 结算”组织，包含三大闭环：学生教学（学生→分班→排课→考勤→考试）、住宿计费（学生/宿舍→入住→费用→账单→押金）、教室租赁（教室/组织→租赁→合同→日程）。
+- 不确定当前角色可用哪些业务流程与实体时，先调用 get_business_context 获取权限范围内的闭环、阶段依赖与实体字典；编写 render_form 字段前可按需调用 get_entity_schema。
+- 执行任何写入或导入前，先调用 get_pending_tasks 或现有查询工具核实前置数据是否已存在：入住依赖学生和宿舍，换宿依赖学生和宿舍，账单依赖入住记录和费用，考勤依赖班级和排课。前置缺失时，先向用户说明缺什么、建议先完成哪一步，再继续，不要机械地跳过依赖直接入库。
+- 导入或录入完成后，根据完成阶段主动给出下一步建议（例如：入住完成 → 建议录入本月公共费用 → 生成并确认账单；学生档案完成 → 建议分班；租赁订单生成 → 建议补充合同），可用 get_pending_tasks 获取有数据支撑的待办。
 - 用户上传 Excel 但未说明用途时，先根据表头判断包含哪些业务，向用户说明将导入什么、依赖什么；疑似导入时先调用 preflight_import 生成预检报告，再引导用户在预检卡内确认并生成导入向导，按依赖顺序执行。
 - 只引导当前角色权限范围内可执行的下一步，不得建议或执行用户无权操作。
 不得扩大用户权限或猜测不可见数据。回答使用简洁中文 Markdown。`;
diff --git a/apps/server/src/ai-chat/ai-chat.module.ts b/apps/server/src/ai-chat/ai-chat.module.ts
index b2319b3..3578137 100644
--- a/apps/server/src/ai-chat/ai-chat.module.ts
+++ b/apps/server/src/ai-chat/ai-chat.module.ts
@@ -8,11 +8,13 @@ import { AiAttachmentService } from './ai-attachment.service';
 import { AiChartService } from './ai-chart.service';
 import { AiExcelReaderService } from './ai-excel-reader.service';
 import { AiFormService } from './ai-form.service';
+import { A2uiSubmissionsService } from './ai-a2ui-submissions.service';
 import { AiReviewService } from './ai-review.service';
 import { AiChatService } from './ai-chat.service';
 import { AiModelStreamService } from './ai-model-stream.service';
 import {
   AiAttachment,
+  AiA2uiSubmission,
   AiConversation,
   AiForm,
   AiMessage,
@@ -24,6 +26,7 @@ import {
   imports: [
     TypeOrmModule.forFeature([
       AiAttachment,
+      AiA2uiSubmission,
       AiConversation,
       AiForm,
       AiMessage,
@@ -40,6 +43,7 @@ import {
     AiChartService,
     AiExcelReaderService,
     AiFormService,
+    A2uiSubmissionsService,
     AiReviewService,
     AiChatService,
     AiModelStreamService,
diff --git a/apps/server/src/ai-chat/ai-chat.service-base.ts b/apps/server/src/ai-chat/ai-chat.service-base.ts
index 20b633b..33bdd5f 100644
--- a/apps/server/src/ai-chat/ai-chat.service-base.ts
+++ b/apps/server/src/ai-chat/ai-chat.service-base.ts
@@ -12,6 +12,7 @@ import { AiChartService } from './ai-chart.service';
 import { AiExcelReaderService } from './ai-excel-reader.service';
 import { AiFormService } from './ai-form.service';
 import { AiReviewService } from './ai-review.service';
+import type { A2uiSubmissionsService } from './ai-a2ui-submissions.service';
 import { AiModelStreamService } from './ai-model-stream.service';
 import { OperationLogsService } from '../operation-logs/operation-logs.service';
 import {
@@ -114,6 +115,7 @@ export abstract class AiChatServiceBase implements AiChatServiceContext {
     readonly chartService: AiChartService,
     readonly abilityFactory: CaslAbilityFactory,
     readonly authorization: AuthorizationService,
+    readonly a2uiSubmissions?: A2uiSubmissionsService,
     readonly excelReader?: AiExcelReaderService,
     readonly importsService?: ImportsService,
     readonly opLog?: OperationLogsService,
@@ -127,7 +129,12 @@ export abstract class AiChatServiceBase implements AiChatServiceContext {
     return a2uiReviewSubmitInfo(metadata);
   }
 
-  buildFormSubmitModelContent(submit: { title: string; values: Record<string, unknown> }): string {
+  buildFormSubmitModelContent(submit: {
+    title: string;
+    values: Record<string, unknown>;
+    submissionId?: string;
+    fieldErrors?: Array<{ field: string; message: string }>;
+  }): string {
     return buildFormSubmitModelContent(submit);
   }
 
@@ -135,6 +142,8 @@ export abstract class AiChatServiceBase implements AiChatServiceContext {
     reviewId: string;
     reviewTitle: string;
     resultMessage: string;
+    submissionId?: string;
+    nextSteps?: Array<{ key: string; label: string }>;
   }): string {
     return buildReviewSubmitModelContent(submit);
   }
diff --git a/apps/server/src/ai-chat/ai-chat.service.spec.ts b/apps/server/src/ai-chat/ai-chat.service.spec.ts
index 99c7449..9b2fb64 100644
--- a/apps/server/src/ai-chat/ai-chat.service.spec.ts
+++ b/apps/server/src/ai-chat/ai-chat.service.spec.ts
@@ -53,6 +53,7 @@ function createService(
     {} as never,
     {
       createForm: jest.fn(),
+      expirePreviousForms: jest.fn().mockResolvedValue([]),
       findOwnedPending: jest.fn(),
       validateValues: jest.fn(),
       markSubmitted: jest.fn(),
@@ -65,6 +66,7 @@ function createService(
     } as never,
     { createForUser: jest.fn().mockReturnValue({}) } as never,
     { assertPermission: jest.fn(), canPermission: jest.fn() } as never,
+    { recordSubmission: jest.fn().mockResolvedValue({ created: true, submission: { id: 1 } }), findSubmission: jest.fn() } as never,
   );
   return { service, conversations, reviewService };
 }
@@ -295,6 +297,7 @@ describe('AiChatService', () => {
         } as never,
         {
           createForm: jest.fn(),
+          expirePreviousForms: jest.fn().mockResolvedValue([]),
           findOwnedPending: jest.fn(),
           validateValues: jest.fn(),
           markSubmitted: jest.fn(),
@@ -314,6 +317,7 @@ describe('AiChatService', () => {
         } as never,
         { createForUser: jest.fn().mockReturnValue({}) } as never,
         { assertPermission: jest.fn(), canPermission: jest.fn() } as never,
+        { recordSubmission: jest.fn().mockResolvedValue({ created: true, submission: { id: 1 } }), findSubmission: jest.fn() } as never,
       );
       const emitted: Array<{ event: string; data: Record<string, unknown> }> = [];
       const run = service.streamMessage(
@@ -456,6 +460,7 @@ describe('AiChatService', () => {
       } as never,
       {
         createForm: jest.fn().mockResolvedValue(formShape),
+        expirePreviousForms: jest.fn().mockResolvedValue([]),
         findOwnedPending: jest.fn(),
         validateValues: jest.fn(),
         markSubmitted: jest.fn(),
@@ -475,6 +480,7 @@ describe('AiChatService', () => {
       } as never,
       { createForUser: jest.fn().mockReturnValue({}) } as never,
       { assertPermission: jest.fn(), canPermission: jest.fn() } as never,
+      { recordSubmission: jest.fn().mockResolvedValue({ created: true, submission: { id: 1 } }), findSubmission: jest.fn() } as never,
     );
     const emitted: Array<{ event: string; data: Record<string, unknown> }> = [];
 
@@ -600,6 +606,7 @@ describe('AiChatService', () => {
       } as never,
       {
         createForm: jest.fn(),
+        expirePreviousForms: jest.fn().mockResolvedValue([]),
         findOwnedPending: jest.fn(),
         validateValues: jest.fn(),
         markSubmitted: jest.fn(),
@@ -619,6 +626,7 @@ describe('AiChatService', () => {
       } as never,
       { createForUser: jest.fn().mockReturnValue({}) } as never,
       { assertPermission: jest.fn(), canPermission: jest.fn() } as never,
+      { recordSubmission: jest.fn().mockResolvedValue({ created: true, submission: { id: 1 } }), findSubmission: jest.fn() } as never,
     );
     const emitted: Array<{ event: string; data: Record<string, unknown> }> = [];
 
@@ -705,6 +713,7 @@ describe('AiChatService', () => {
       } as never,
       {
         createForm: jest.fn(),
+        expirePreviousForms: jest.fn().mockResolvedValue([]),
         findOwnedPending: jest.fn(),
         validateValues: jest.fn(),
         markSubmitted: jest.fn(),
@@ -727,6 +736,7 @@ describe('AiChatService', () => {
       } as never,
       { createForUser: jest.fn().mockReturnValue({}) } as never,
       { assertPermission, canPermission: jest.fn() } as never,
+      { recordSubmission: jest.fn().mockResolvedValue({ created: true, submission: { id: 1 } }), findSubmission: jest.fn() } as never,
     );
     const emitted: Array<{ event: string }> = [];
 
@@ -842,6 +852,7 @@ describe('AiChatService', () => {
       } as never,
       {
         createForm: jest.fn(),
+        expirePreviousForms: jest.fn().mockResolvedValue([]),
         findOwnedPending: jest.fn(),
         validateValues: jest.fn(),
         markSubmitted: jest.fn(),
@@ -864,6 +875,7 @@ describe('AiChatService', () => {
       } as never,
       { createForUser: jest.fn().mockReturnValue({}) } as never,
       { assertPermission, canPermission: jest.fn() } as never,
+      { recordSubmission: jest.fn().mockResolvedValue({ created: true, submission: { id: 1 } }), findSubmission: jest.fn() } as never,
     );
     const order: string[] = [];
     const emitted: Array<{ event: string; data: Record<string, unknown> }> = [];
@@ -1114,6 +1126,7 @@ describe('AiChatService', () => {
       { removeOrphans } as never,
       {
         createForm: jest.fn(),
+        expirePreviousForms: jest.fn().mockResolvedValue([]),
         findOwnedPending: jest.fn(),
         validateValues: jest.fn(),
         markSubmitted: jest.fn(),
@@ -1133,6 +1146,7 @@ describe('AiChatService', () => {
       } as never,
       { createForUser: jest.fn().mockReturnValue({}) } as never,
       { assertPermission: jest.fn(), canPermission: jest.fn() } as never,
+      { recordSubmission: jest.fn().mockResolvedValue({ created: true, submission: { id: 1 } }), findSubmission: jest.fn() } as never,
     );
 
     await expect(service.deleteMessage(7, 3, 10)).resolves.toEqual({ deletedIds: [10, 11] });
@@ -1154,6 +1168,7 @@ describe('AiChatService', () => {
       {} as never,
       {
         createForm: jest.fn(),
+        expirePreviousForms: jest.fn().mockResolvedValue([]),
         findOwnedPending: jest.fn(),
         validateValues: jest.fn(),
         markSubmitted: jest.fn(),
@@ -1173,6 +1188,7 @@ describe('AiChatService', () => {
       } as never,
       { createForUser: jest.fn().mockReturnValue({}) } as never,
       { assertPermission: jest.fn(), canPermission: jest.fn() } as never,
+      { recordSubmission: jest.fn().mockResolvedValue({ created: true, submission: { id: 1 } }), findSubmission: jest.fn() } as never,
     );
     (service as unknown as { activeConversations: Set<number> }).activeConversations.add(3);
     await expect(service.deleteMessage(7, 3, 10)).rejects.toBeInstanceOf(ConflictException);
@@ -1238,6 +1254,7 @@ describe('AiChatService', () => {
       { removeOrphans } as never,
       {
         createForm: jest.fn(),
+        expirePreviousForms: jest.fn().mockResolvedValue([]),
         findOwnedPending: jest.fn(),
         validateValues: jest.fn(),
         markSubmitted: jest.fn(),
@@ -1257,6 +1274,7 @@ describe('AiChatService', () => {
       } as never,
       { createForUser: jest.fn().mockReturnValue({}) } as never,
       { assertPermission: jest.fn(), canPermission: jest.fn() } as never,
+      { recordSubmission: jest.fn().mockResolvedValue({ created: true, submission: { id: 1 } }), findSubmission: jest.fn() } as never,
     );
     const emitted: Array<{ event: string; data: Record<string, unknown> }> = [];
 
diff --git a/apps/server/src/ai-chat/ai-chat.service.ts b/apps/server/src/ai-chat/ai-chat.service.ts
index 3899efa..8f71896 100644
--- a/apps/server/src/ai-chat/ai-chat.service.ts
+++ b/apps/server/src/ai-chat/ai-chat.service.ts
@@ -14,6 +14,7 @@ import { AiChartService } from './ai-chart.service';
 import { AiExcelReaderService } from './ai-excel-reader.service';
 import { AiFormService } from './ai-form.service';
 import { AiReviewService } from './ai-review.service';
+import type { A2uiSubmissionsService } from './ai-a2ui-submissions.service';
 import { AiModelStreamService } from './ai-model-stream.service';
 import { OperationLogsService } from '../operation-logs/operation-logs.service';
 import { AiConversation, AiMessage, AiToolRun } from './entities';
@@ -66,6 +67,7 @@ export class AiChatService extends AiChatServiceBase {
     chartService: AiChartService,
     abilityFactory: CaslAbilityFactory,
     authorization: AuthorizationService,
+    a2uiSubmissions?: A2uiSubmissionsService,
     excelReader?: AiExcelReaderService,
     importsService?: ImportsService,
     opLog?: OperationLogsService,
@@ -84,6 +86,7 @@ export class AiChatService extends AiChatServiceBase {
       chartService,
       abilityFactory,
       authorization,
+      a2uiSubmissions,
       excelReader,
       importsService,
       opLog,
diff --git a/apps/server/src/ai-chat/ai-chat.submissions.flow.ts b/apps/server/src/ai-chat/ai-chat.submissions.flow.ts
index 1251cd3..a0e743f 100644
--- a/apps/server/src/ai-chat/ai-chat.submissions.flow.ts
+++ b/apps/server/src/ai-chat/ai-chat.submissions.flow.ts
@@ -1,9 +1,22 @@
 import type { AiChatServiceContext, AiSseEmitter } from './ai-chat.types';
 import { DEFAULT_TITLE } from './ai-chat.types';
 import type { AuthenticatedUser } from '../authorization';
+import { suggestNextStepsForPrincipal } from '../agent-context/business-context.service';
+import { buildA2uiArtifact } from './ai-a2ui.artifact';
+import { A2uiSubmissionsService } from './ai-a2ui-submissions.service';
+import { AiA2uiSubmission } from './entities';
 import { assertReviewImportPermissions } from './ai-chat.review-confirm';
 import { persistExchange, runGenerationAndRelease } from './ai-chat.submissions.runtime';
 
+function submissionsService(
+  context: AiChatServiceContext,
+): A2uiSubmissionsService {
+  return (
+    context.a2uiSubmissions ??
+    new A2uiSubmissionsService(context.dataSource.getRepository(AiA2uiSubmission))
+  );
+}
+
 export async function submitForm(
   context: AiChatServiceContext,
   user: AuthenticatedUser,
@@ -19,6 +32,18 @@ export async function submitForm(
   const effectiveSkillKey = conversation.lockedSkillKey ?? null;
   context.assertSkillAvailable(user, effectiveSkillKey);
 
+  const submissions = submissionsService(context);
+  const recorded = await submissions.recordSubmission({
+    artifactId: formId,
+    clientRequestId: dto.clientRequestId,
+    status: 'created',
+  });
+  if (!recorded.created) {
+    emit('error', { message: '该表单已提交过，请勿重复提交' });
+    emit('done', {});
+    return;
+  }
+
   await context.acquireConversation(conversation.id);
   try {
     const summary = `已提交表单「${form.title}」`;
@@ -31,7 +56,15 @@ export async function submitForm(
         summary,
         dto.clientRequestId,
         effectiveSkillKey,
-        { a2uiSubmit: { formId: form.id, formTitle: form.title, values } },
+        {
+          a2uiSubmit: {
+            formId: form.id,
+            formTitle: form.title,
+            values,
+            submissionId: String(recorded.submission.id),
+            fieldErrors: [],
+          },
+        },
         undefined,
         conversation.title === DEFAULT_TITLE ? form.title.slice(0, 30) : undefined,
       ),
@@ -39,6 +72,17 @@ export async function submitForm(
 
     await context.formService.markSubmitted(form, values);
     await context.markFormSubmittedOnMessage(form.assistantMessageId, conversation.id);
+    emit('ui.artifact', {
+      messageId: form.assistantMessageId,
+      artifact: buildA2uiArtifact({
+        type: 'form',
+        id: form.id,
+        status: 'submitted',
+        messageId: form.assistantMessageId,
+        conversationId: conversation.id,
+        payload: { ...context.formService.serialize(form), status: 'submitted' },
+      }),
+    });
 
     await runGenerationAndRelease(context, {
       user,
@@ -73,12 +117,43 @@ export async function submitReview(
   context.assertSkillAvailable(user, effectiveSkillKey);
   assertReviewImportPermissions(context, user, review);
 
+  const submissions = submissionsService(context);
+  const recorded = await submissions.recordSubmission({
+    artifactId: reviewId,
+    clientRequestId: dto.clientRequestId,
+    status: 'created',
+  });
+  if (!recorded.created) {
+    emit('error', { message: '该导入预览已确认过，请勿重复提交' });
+    emit('done', {});
+    return;
+  }
+
   await context.acquireConversation(conversation.id);
   try {
     const { review: updatedReview, result } = await context.reviewService.submitAll(
       review.id,
       user.id,
     );
+    const sectionTypes = context.reviewService
+      .parseSections(review.sectionsJson)
+      .map((section) => section.type)
+      .filter(Boolean);
+    const completedStageKeys = [
+      ...new Set(
+        sectionTypes.map((type) =>
+          type === 'students'
+            ? 'profile'
+            : type === 'rooms'
+              ? 'room'
+              : 'checkin',
+        ),
+      ),
+    ];
+    const nextSteps = suggestNextStepsForPrincipal(
+      { permissions: user.permissions, isSuperAdmin: user.isSuperAdmin },
+      completedStageKeys,
+    ).map((step) => ({ key: step.key, label: step.label }));
     const summary = `已确认导入「${review.title}」：${result.message}`;
     await context.opLog?.log({
       userId: user.id,
@@ -103,6 +178,8 @@ export async function submitReview(
             reviewId: review.id,
             reviewTitle: review.title,
             resultMessage: result.message,
+            submissionId: String(recorded.submission.id),
+            nextSteps,
           },
         },
         undefined,
@@ -117,6 +194,17 @@ export async function submitReview(
       messageId: updatedReview.assistantMessageId,
       review: serialized,
     });
+    emit('ui.artifact', {
+      messageId: updatedReview.assistantMessageId,
+      artifact: buildA2uiArtifact({
+        type: 'review',
+        id: review.id,
+        status: 'submitted',
+        messageId: updatedReview.assistantMessageId,
+        conversationId: conversation.id,
+        payload: serialized,
+      }),
+    });
     await context.markReviewSubmittedOnMessage(
       updatedReview.assistantMessageId,
       conversation.id,
diff --git a/apps/server/src/ai-chat/ai-chat.submit-content.spec.ts b/apps/server/src/ai-chat/ai-chat.submit-content.spec.ts
new file mode 100644
index 0000000..d7d1b12
--- /dev/null
+++ b/apps/server/src/ai-chat/ai-chat.submit-content.spec.ts
@@ -0,0 +1,66 @@
+import { describe, expect, it } from '@jest/globals';
+import {
+  a2uiReviewSubmitInfo,
+  a2uiSubmitInfo,
+  buildFormSubmitModelContent,
+  buildReviewSubmitModelContent,
+} from './ai-chat.submit-content';
+
+describe('a2ui submit model content', () => {
+  it('表单提交信息解析 submissionId 与 fieldErrors', () => {
+    const info = a2uiSubmitInfo({
+      a2uiSubmit: {
+        formId: 'form-1',
+        formTitle: '新增学生',
+        values: { name: '张三' },
+        submissionId: 'sub-1',
+        fieldErrors: [{ field: 'phone', message: '手机号格式错误' }],
+      },
+    });
+    expect(info).toEqual({
+      formId: 'form-1',
+      title: '新增学生',
+      values: { name: '张三' },
+      submissionId: 'sub-1',
+      fieldErrors: [{ field: 'phone', message: '手机号格式错误' }],
+    });
+  });
+
+  it('表单回灌内容包含提交 ID 与结构化错误', () => {
+    const content = buildFormSubmitModelContent({
+      title: '新增学生',
+      values: { name: '张三' },
+      submissionId: 'sub-1',
+      fieldErrors: [],
+    });
+    expect(content).toContain('sub-1');
+    expect(content).toContain('"name":"张三"');
+    expect(content).toContain('fieldErrors');
+  });
+
+  it('审阅提交信息解析 submissionId 与下一步建议', () => {
+    const info = a2uiReviewSubmitInfo({
+      a2uiReviewSubmit: {
+        reviewId: 'review-1',
+        reviewTitle: '批量入住导入',
+        resultMessage: '已导入 12 条',
+        submissionId: 'sub-2',
+        nextSteps: [{ key: 'after_checkin', label: '入住完成 → 建议录入费用' }],
+      },
+    });
+    expect(info?.submissionId).toBe('sub-2');
+    expect(info?.nextSteps).toHaveLength(1);
+  });
+
+  it('审阅回灌内容包含提交 ID 与下一步建议', () => {
+    const content = buildReviewSubmitModelContent({
+      reviewId: 'review-1',
+      reviewTitle: '批量入住导入',
+      resultMessage: '已导入 12 条',
+      submissionId: 'sub-2',
+      nextSteps: [{ key: 'after_checkin', label: '入住完成 → 建议录入费用' }],
+    });
+    expect(content).toContain('sub-2');
+    expect(content).toContain('建议录入费用');
+  });
+});
diff --git a/apps/server/src/ai-chat/ai-chat.submit-content.ts b/apps/server/src/ai-chat/ai-chat.submit-content.ts
index b21668a..5fd291b 100644
--- a/apps/server/src/ai-chat/ai-chat.submit-content.ts
+++ b/apps/server/src/ai-chat/ai-chat.submit-content.ts
@@ -3,21 +3,35 @@ import type { AiChatServiceContext } from './ai-chat.types';
 
 export function a2uiSubmitInfo(
   metadata: Record<string, unknown> | null,
-): { title: string; values: Record<string, unknown> } | null {
+): {
+  formId: string;
+  title: string;
+  values: Record<string, unknown>;
+  submissionId?: string;
+  fieldErrors?: Array<{ field: string; message: string }>;
+} | null {
   const submit = metadata?.a2uiSubmit;
   if (!submit || typeof submit !== 'object' || Array.isArray(submit)) return null;
   const record = submit as Record<string, unknown>;
+  const formId = typeof record.formId === 'string' ? record.formId : '';
   const title = typeof record.formTitle === 'string' ? record.formTitle : '表单';
   const values =
     record.values && typeof record.values === 'object' && !Array.isArray(record.values)
       ? (record.values as Record<string, unknown>)
       : {};
-  return { title, values };
+  const submissionId =
+    typeof record.submissionId === 'string' ? record.submissionId : undefined;
+  const fieldErrors = Array.isArray(record.fieldErrors)
+    ? (record.fieldErrors as Array<{ field: string; message: string }>)
+    : [];
+  return { formId, title, values, submissionId, fieldErrors };
 }
 
 export function buildFormSubmitModelContent(submit: {
   title: string;
   values: Record<string, unknown>;
+  submissionId?: string;
+  fieldErrors?: Array<{ field: string; message: string }>;
 }): string {
   let json: string;
   try {
@@ -25,7 +39,11 @@ export function buildFormSubmitModelContent(submit: {
   } catch {
     json = '[无法序列化]';
   }
-  return `【表单提交：${submit.title}】\n提交值（JSON）：${json.slice(0, 32 * 1024)}\n用户已在表单中确认，你可以执行允许的写操作工具。`;
+  const submissionId = submit.submissionId ? `\n提交ID：${submit.submissionId}` : '';
+  const fieldErrors = submit.fieldErrors?.length
+    ? `\nfieldErrors: ${JSON.stringify(submit.fieldErrors)}`
+    : '\nfieldErrors: []';
+  return `【表单提交：${submit.title}】${submissionId}\n提交值（JSON）：${json.slice(0, 32 * 1024)}${fieldErrors}\n用户已在表单中确认，你可以执行允许的写操作工具。`;
 }
 
 export async function markFormSubmittedOnMessage(
@@ -48,15 +66,28 @@ export async function markFormSubmittedOnMessage(
 
 export function a2uiReviewSubmitInfo(
   metadata: Record<string, unknown> | null,
-): { reviewId: string; reviewTitle: string; resultMessage: string } | null {
+): {
+  reviewId: string;
+  reviewTitle: string;
+  resultMessage: string;
+  submissionId?: string;
+  nextSteps?: Array<{ key: string; label: string }>;
+} | null {
   const submit = metadata?.a2uiReviewSubmit;
   if (!submit || typeof submit !== 'object' || Array.isArray(submit)) return null;
   const record = submit as Record<string, unknown>;
   if (typeof record.reviewId !== 'string') return null;
+  const submissionId =
+    typeof record.submissionId === 'string' ? record.submissionId : undefined;
+  const nextSteps = Array.isArray(record.nextSteps)
+    ? (record.nextSteps as Array<{ key: string; label: string }>)
+    : [];
   return {
     reviewId: record.reviewId,
     reviewTitle: typeof record.reviewTitle === 'string' ? record.reviewTitle : '批量导入',
     resultMessage: typeof record.resultMessage === 'string' ? record.resultMessage : '导入已完成',
+    submissionId,
+    nextSteps,
   };
 }
 
@@ -64,8 +95,14 @@ export function buildReviewSubmitModelContent(submit: {
   reviewId: string;
   reviewTitle: string;
   resultMessage: string;
+  submissionId?: string;
+  nextSteps?: Array<{ key: string; label: string }>;
 }): string {
-  return `【批量导入已确认：${submit.reviewTitle}】\n${submit.resultMessage}\n数据已由系统入库，不要再次调用写入工具，直接向用户汇报导入结果即可。`;
+  const submissionId = submit.submissionId ? `\n提交ID：${submit.submissionId}` : '';
+  const nextSteps = submit.nextSteps?.length
+    ? `\n下一步建议：${submit.nextSteps.map((step) => step.label).join('；')}`
+    : '';
+  return `【批量导入已确认：${submit.reviewTitle}】${submissionId}\n${submit.resultMessage}${nextSteps}\n数据已由系统入库，不要再次调用写入工具，直接向用户汇报导入结果即可。`;
 }
 
 export async function markReviewSubmittedOnMessage(
diff --git a/apps/server/src/ai-chat/ai-chat.tool-actions.import.ts b/apps/server/src/ai-chat/ai-chat.tool-actions.import.ts
index f37665d..25067d9 100644
--- a/apps/server/src/ai-chat/ai-chat.tool-actions.import.ts
+++ b/apps/server/src/ai-chat/ai-chat.tool-actions.import.ts
@@ -8,6 +8,7 @@ import { permittedStepKeys } from '../imports/imports.access';
 import { expandStageSheets } from '../imports/imports.mapping';
 import type { AiChatServiceContext, AiSseEmitter, ModelToolCall } from './ai-chat.types';
 import type { AgentToolContext } from './ai-chat.tools';
+import { buildA2uiArtifact } from './ai-a2ui.artifact';
 import { AiMessage } from './entities';
 import { finishToolRun, startToolRun } from './ai-chat.tools';
 import {
@@ -155,6 +156,17 @@ export const executePreflightImport = makeImportToolExecutor(
         .join('、') || '未识别到可导入阶段'}`,
     }, emit);
     emit('ui.import_preflight', { messageId, preflight: preflightCard });
+    emit('ui.artifact', {
+      messageId,
+      artifact: buildA2uiArtifact({
+        type: 'import_preflight',
+        id: `preflight-${attachment.id}`,
+        status: 'pending',
+        messageId,
+        conversationId: assistant.conversationId,
+        payload: preflightCard,
+      }),
+    });
     return preflightModelPayload(preflight, permittedSteps);
   });
 
@@ -241,6 +253,17 @@ export const executeStartImportWizard = makeImportToolExecutor(
       });
     }
     emit('ui.import_wizard', { messageId, wizard });
+    emit('ui.artifact', {
+      messageId,
+      artifact: buildA2uiArtifact({
+        type: 'import_wizard',
+        id: `wizard-${detail.id}`,
+        status: 'pending',
+        messageId,
+        conversationId: assistant.conversationId,
+        payload: wizard,
+      }),
+    });
     return JSON.stringify({
       status: 'success',
       runId: detail.id,
diff --git a/apps/server/src/ai-chat/ai-chat.tool-actions.ts b/apps/server/src/ai-chat/ai-chat.tool-actions.ts
index f3a5dec..7b8fe3d 100644
--- a/apps/server/src/ai-chat/ai-chat.tool-actions.ts
+++ b/apps/server/src/ai-chat/ai-chat.tool-actions.ts
@@ -1,5 +1,6 @@
 import { AiReview } from './entities/ai-review.entity';
 import type { AiChatServiceContext, AiSseEmitter, ModelToolCall } from './ai-chat.types';
+import { buildA2uiArtifact } from './ai-a2ui.artifact';
 import { finishToolRun, startToolRun } from './ai-chat.tools';
 export async function executeRenderForm(
   context: AiChatServiceContext,
@@ -20,6 +21,39 @@ export async function executeRenderForm(
       { userId, conversationId: assistant.conversationId, assistantMessageId: messageId },
       parsedArgs,
     );
+    const expiredForms = await context.formService.expirePreviousForms(
+      userId,
+      assistant.conversationId,
+      form.id,
+    );
+    await Promise.all(
+      expiredForms.map(async (expired) => {
+        const oldAssistant = await context.messages.findOne({
+          where: { id: expired.assistantMessageId, conversationId: assistant.conversationId },
+        });
+        const oldA2ui = oldAssistant?.metadata?.a2uiForm;
+        if (oldAssistant && oldA2ui && typeof oldA2ui === 'object' && !Array.isArray(oldA2ui)) {
+          oldAssistant.metadata = {
+            ...oldAssistant.metadata,
+            a2uiForm: context.formService.serialize(expired),
+          };
+          await context.messages.save(oldAssistant);
+        }
+        const expiredPayload = context.formService.serialize(expired);
+        emit('ui.form', { messageId: expired.assistantMessageId, form: expiredPayload });
+        emit('ui.artifact', {
+          messageId: expired.assistantMessageId,
+          artifact: buildA2uiArtifact({
+            type: 'form',
+            id: expired.id,
+            status: 'expired',
+            messageId: expired.assistantMessageId,
+            conversationId: assistant.conversationId,
+            payload: expiredPayload,
+          }),
+        });
+      }),
+    );
     assistant.metadata = {
       ...assistant.metadata,
       a2uiForm: context.formService.serialize(form),
@@ -31,6 +65,17 @@ export async function executeRenderForm(
       messageId,
       form: context.formService.serialize(form),
     });
+    emit('ui.artifact', {
+      messageId,
+      artifact: buildA2uiArtifact({
+        type: 'form',
+        id: form.id,
+        status: form.status === 'submitted' ? 'submitted' : 'pending',
+        messageId,
+        conversationId: assistant.conversationId,
+        payload: context.formService.serialize(form),
+      }),
+    });
     return JSON.stringify({
       status: 'success',
       formId: form.id,
@@ -119,6 +164,17 @@ export async function executeRenderReview(
           messageId: expired.assistantMessageId,
           review: context.reviewService.serialize(expired),
         });
+        emit('ui.artifact', {
+          messageId: expired.assistantMessageId,
+          artifact: buildA2uiArtifact({
+            type: 'review',
+            id: expired.id,
+            status: expired.status === 'submitted' ? 'submitted' : 'expired',
+            messageId: expired.assistantMessageId,
+            conversationId: assistant.conversationId,
+            payload: context.reviewService.serialize(expired),
+          }),
+        });
       }),
     );
     assistant.metadata = {
@@ -132,6 +188,17 @@ export async function executeRenderReview(
       messageId,
       review: context.reviewService.serialize(review),
     });
+    emit('ui.artifact', {
+      messageId,
+      artifact: buildA2uiArtifact({
+        type: 'review',
+        id: review.id,
+        status: review.status === 'submitted' ? 'submitted' : 'pending',
+        messageId,
+        conversationId: assistant.conversationId,
+        payload: context.reviewService.serialize(review),
+      }),
+    });
     return JSON.stringify({
       status: 'success',
       reviewId: review.id,
@@ -179,6 +246,17 @@ export async function executeRenderChart(
       messageId,
       chart: context.chartService.serialize(chart),
     });
+    emit('ui.artifact', {
+      messageId,
+      artifact: buildA2uiArtifact({
+        type: 'chart',
+        id: chart.id,
+        status: 'pending',
+        messageId,
+        conversationId: assistant.conversationId,
+        payload: context.chartService.serialize(chart),
+      }),
+    });
     return JSON.stringify({
       status: 'success',
       chartId: chart.id,
diff --git a/apps/server/src/ai-chat/ai-chat.types.ts b/apps/server/src/ai-chat/ai-chat.types.ts
index b1108b1..e51cd7e 100644
--- a/apps/server/src/ai-chat/ai-chat.types.ts
+++ b/apps/server/src/ai-chat/ai-chat.types.ts
@@ -10,6 +10,7 @@ import { AiChartService } from './ai-chart.service';
 import { AiExcelReaderService } from './ai-excel-reader.service';
 import { AiFormService } from './ai-form.service';
 import { AiReviewService } from './ai-review.service';
+import type { A2uiSubmissionsService } from './ai-a2ui-submissions.service';
 import { AiModelStreamService } from './ai-model-stream.service';
 import { OperationLogsService } from '../operation-logs/operation-logs.service';
 import {
@@ -95,6 +96,7 @@ export interface AiChatServiceContext {
   readonly excelReader?: AiExcelReaderService;
   readonly importsService?: ImportsService;
   readonly opLog?: OperationLogsService;
+  readonly a2uiSubmissions?: A2uiSubmissionsService;
   listSkills(user: AuthenticatedUser): ReturnType<AgentToolExecutor['listSkills']>;
   serializeMessage(message: AiMessage): Record<string, unknown>;
   redactText(value: string): string;
@@ -114,11 +116,18 @@ export interface AiChatServiceContext {
     reviewTitle: string;
     resultMessage: string;
   } | null;
-  buildFormSubmitModelContent(submit: { title: string; values: Record<string, unknown> }): string;
+  buildFormSubmitModelContent(submit: {
+    title: string;
+    values: Record<string, unknown>;
+    submissionId?: string;
+    fieldErrors?: Array<{ field: string; message: string }>;
+  }): string;
   buildReviewSubmitModelContent(submit: {
     reviewId: string;
     reviewTitle: string;
     resultMessage: string;
+    submissionId?: string;
+    nextSteps?: Array<{ key: string; label: string }>;
   }): string;
   markFormSubmittedOnMessage(assistantMessageId: number, conversationId: number): Promise<void>;
   markReviewSubmittedOnMessage(
@@ -175,6 +184,7 @@ export type AiSseEventName =
   | 'ui.form'
   | 'ui.review'
   | 'ui.chart'
+  | 'ui.artifact'
   | 'ui.import_preflight'
   | 'ui.import_wizard'
   | 'attachment.processed'
diff --git a/apps/server/src/ai-chat/ai-form.service.spec.ts b/apps/server/src/ai-chat/ai-form.service.spec.ts
index 1763b49..ffd97b3 100644
--- a/apps/server/src/ai-chat/ai-form.service.spec.ts
+++ b/apps/server/src/ai-chat/ai-form.service.spec.ts
@@ -1,4 +1,5 @@
 import { BadRequestException, NotFoundException } from '@nestjs/common';
+import { In } from 'typeorm';
 import { AiFormService } from './ai-form.service';
 
 function createService(overrides: Record<string, unknown> = {}) {
@@ -140,6 +141,35 @@ describe('AiFormService', () => {
     });
   });
 
+  describe('expirePreviousForms', () => {
+    it('过期同会话其他 pending 表单并返回过期记录', async () => {
+      const pending = [
+        { id: 'form-a', userId: 7, conversationId: 3, status: 'pending' },
+        { id: 'form-b', userId: 7, conversationId: 3, status: 'pending' },
+      ];
+      const { service, forms } = createService({
+        find: jest.fn().mockResolvedValue(pending),
+        update: jest.fn().mockResolvedValue({}),
+      });
+      const expired = await service.expirePreviousForms(7, 3, 'form-b');
+      expect(expired.map((item) => item.id)).toEqual(['form-a']);
+      expect(expired[0].status).toBe('expired');
+      expect(forms.update).toHaveBeenCalledWith(
+        { id: In(['form-a']) },
+        { status: 'expired' },
+      );
+    });
+
+    it('没有其他 pending 表单时返回空数组且不更新', async () => {
+      const { service, forms } = createService({
+        find: jest.fn().mockResolvedValue([{ id: 'form-b' }]),
+        update: jest.fn(),
+      });
+      await expect(service.expirePreviousForms(7, 3, 'form-b')).resolves.toEqual([]);
+      expect(forms.update).not.toHaveBeenCalled();
+    });
+  });
+
   describe('validateValues', () => {
     const form = {
       fieldsJson: JSON.stringify(validSchema.fields),
diff --git a/apps/server/src/ai-chat/ai-form.service.ts b/apps/server/src/ai-chat/ai-form.service.ts
index 205c72e..a72488f 100644
--- a/apps/server/src/ai-chat/ai-form.service.ts
+++ b/apps/server/src/ai-chat/ai-form.service.ts
@@ -1,6 +1,6 @@
 import { BadRequestException, Injectable, NotFoundException } from '@nestjs/common';
 import { InjectRepository } from '@nestjs/typeorm';
-import { Repository } from 'typeorm';
+import { In, Repository } from 'typeorm';
 import { uuidV7 } from '../common/uuid-v7';
 import { AiForm, type AiFormField } from './entities/ai-form.entity';
 
@@ -108,10 +108,28 @@ export class AiFormService {
 
   async findOwnedPending(formId: string, userId: number): Promise<AiForm> {
     const form = await this.forms.findOne({ where: { id: formId, userId, status: 'pending' } });
-    if (!form) throw new NotFoundException('表单不存在或已提交');
+    if (!form) throw new NotFoundException('表单不存在、已提交或已失效');
     return form;
   }
 
+  /**
+   * 过期同会话其他 pending 表单（新表单渲染后旧表单不可再提交）。
+   */
+  async expirePreviousForms(
+    userId: number,
+    conversationId: number,
+    exceptFormId: string,
+  ): Promise<AiForm[]> {
+    const pending = await this.forms.find({
+      where: { userId, conversationId, status: 'pending' },
+    });
+    const expired = pending.filter((form) => form.id !== exceptFormId);
+    if (expired.length === 0) return [];
+    const ids = expired.map((form) => form.id);
+    await this.forms.update({ id: In(ids) }, { status: 'expired' });
+    return expired.map((form) => ({ ...form, status: 'expired' as const }));
+  }
+
   async markSubmitted(form: AiForm, values: Record<string, unknown>): Promise<AiForm> {
     form.status = 'submitted';
     form.submittedValuesJson = JSON.stringify(values);
diff --git a/apps/server/src/ai-chat/entities/ai-a2ui-submission.entity.ts b/apps/server/src/ai-chat/entities/ai-a2ui-submission.entity.ts
new file mode 100644
index 0000000..9568b50
--- /dev/null
+++ b/apps/server/src/ai-chat/entities/ai-a2ui-submission.entity.ts
@@ -0,0 +1,35 @@
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  Index,
+  PrimaryGeneratedColumn,
+} from 'typeorm';
+
+/**
+ * A2UI 提交幂等记录：同一 artifact + clientRequestId 只允许执行一次，
+ * 重复提交返回既有结果，避免双击/重试导致二次写入或二次生成。
+ */
+@Entity('ai_a2ui_submissions')
+@Index('uk_ai_a2ui_submissions_artifact_client', ['artifactId', 'clientRequestId'], {
+  unique: true,
+})
+export class AiA2uiSubmission {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({ name: 'artifact_id', type: 'varchar', length: 100 })
+  artifactId: string;
+
+  @Column({ name: 'client_request_id', type: 'varchar', length: 36 })
+  clientRequestId: string;
+
+  @Column({ type: 'varchar', length: 20 })
+  status: string;
+
+  @Column({ name: 'result_json', type: 'text', nullable: true })
+  resultJson: string | null;
+
+  @CreateDateColumn({ name: 'created_at', type: 'datetime' })
+  createdAt: Date;
+}
diff --git a/apps/server/src/ai-chat/entities/ai-form.entity.ts b/apps/server/src/ai-chat/entities/ai-form.entity.ts
index d77dc88..7226788 100644
--- a/apps/server/src/ai-chat/entities/ai-form.entity.ts
+++ b/apps/server/src/ai-chat/entities/ai-form.entity.ts
@@ -10,7 +10,7 @@ import {
 } from 'typeorm';
 import { AiMessage } from './ai-message.entity';
 
-export type AiFormStatus = 'pending' | 'submitted';
+export type AiFormStatus = 'pending' | 'submitted' | 'expired';
 
 export interface AiFormField {
   name: string;
diff --git a/apps/server/src/ai-chat/entities/index.ts b/apps/server/src/ai-chat/entities/index.ts
index 164aeb1..075580f 100644
--- a/apps/server/src/ai-chat/entities/index.ts
+++ b/apps/server/src/ai-chat/entities/index.ts
@@ -4,3 +4,4 @@ export * from './ai-tool-run.entity';
 export * from './ai-attachment.entity';
 export * from './ai-form.entity';
 export * from './ai-review.entity';
+export * from './ai-a2ui-submission.entity';
diff --git a/apps/server/src/app.module.ts b/apps/server/src/app.module.ts
index 8816293..66dad62 100644
--- a/apps/server/src/app.module.ts
+++ b/apps/server/src/app.module.ts
@@ -19,6 +19,7 @@ import { AddA2UiReviews1784880000000 } from './migrations/1784880000000-AddA2UiR
 import { AddImportRuns1784910000000 } from './migrations/1784910000000-AddImportRuns';
 import { DropAiMessageFeedback1784920000000 } from './migrations/1784920000000-DropAiMessageFeedback';
 import { AddImportRunSettings1784930000000 } from './migrations/1784930000000-AddImportRunSettings';
+import { AddA2UiSubmissions1786001000000 } from './migrations/1786001000000-AddA2UiSubmissions';
 const allMigrations = [
   InitialSchema1784520727860,
   AddExamManagement1784600000000,
@@ -31,6 +32,7 @@ const allMigrations = [
   AddImportRuns1784910000000,
   DropAiMessageFeedback1784920000000,
   AddImportRunSettings1784930000000,
+  AddA2UiSubmissions1786001000000,
 ];
 import { AuthorizationModule } from './authorization';
 import { RbacModule } from './rbac/rbac.module';
@@ -149,6 +151,7 @@ import { IntegrationConfigModule } from './integration/config/config.module';
           Entities.AiAttachment,
           Entities.AiForm,
           Entities.AiReview,
+          Entities.AiA2uiSubmission,
           Entities.ImportRun,
           Entities.ImportStep,
           Entities.ImportRow,
diff --git a/apps/server/src/entities/index.ts b/apps/server/src/entities/index.ts
index ed8af6e..1eb8118 100644
--- a/apps/server/src/entities/index.ts
+++ b/apps/server/src/entities/index.ts
@@ -53,6 +53,7 @@ export {
   AiToolRun,
   AiForm,
   AiReview,
+  AiA2uiSubmission,
 } from '../ai-chat/entities';
 export { ImportRun } from '../imports/entities/import-run.entity';
 export { ImportStep } from '../imports/entities/import-step.entity';
diff --git a/apps/server/src/migrations/1786001000000-AddA2UiSubmissions.ts b/apps/server/src/migrations/1786001000000-AddA2UiSubmissions.ts
new file mode 100644
index 0000000..64d810b
--- /dev/null
+++ b/apps/server/src/migrations/1786001000000-AddA2UiSubmissions.ts
@@ -0,0 +1,37 @@
+import { MigrationInterface, QueryRunner, Table, TableIndex } from 'typeorm';
+
+/**
+ * A2UI 提交幂等记录：同一 artifact + clientRequestId 只允许执行一次。
+ */
+export class AddA2UiSubmissions1786001000000 implements MigrationInterface {
+  async up(queryRunner: QueryRunner): Promise<void> {
+    if (await queryRunner.hasTable('ai_a2ui_submissions')) return;
+    await queryRunner.createTable(
+      new Table({
+        name: 'ai_a2ui_submissions',
+        columns: [
+          { name: 'id', type: 'int', isPrimary: true, isGenerated: true, generationStrategy: 'increment' },
+          { name: 'artifact_id', type: 'varchar', length: '100' },
+          { name: 'client_request_id', type: 'varchar', length: '36' },
+          { name: 'status', type: 'varchar', length: '20' },
+          { name: 'result_json', type: 'text', isNullable: true },
+          { name: 'created_at', type: 'datetime', default: 'CURRENT_TIMESTAMP' },
+        ],
+      }),
+    );
+    await queryRunner.createIndex(
+      'ai_a2ui_submissions',
+      new TableIndex({
+        name: 'uk_ai_a2ui_submissions_artifact_client',
+        columnNames: ['artifact_id', 'client_request_id'],
+        isUnique: true,
+      }),
+    );
+  }
+
+  async down(queryRunner: QueryRunner): Promise<void> {
+    if (await queryRunner.hasTable('ai_a2ui_submissions')) {
+      await queryRunner.dropTable('ai_a2ui_submissions');
+    }
+  }
+}