fix(wechat): guard bare page-continuation follow-ups from session loss and memory drift

Prevent chat-to-page flows like writing a poem then saying "做成页面吧" from opening
a fresh session without carried content, failing with a vague error, or letting Memory
page-template preferences replace the immediate topic.

Co-authored-by: Cursor <cursoragent@cursor.com>

wechat/intent/page-continuation-context.mjs

@@ -0,0 +1,128 @@
+/** Guards for WeChat “做成页面” follow-ups that must bind to in-session content. */
+
+const PAGE_SOURCE_REFERENCE_PATTERN =
+  /(?:这个|刚才|上面|前面|上一条|它|这首|这篇|这段|以下内容|以上内容|刚才生成|上面生成)/iu;
+
+const PAGE_TEMPLATE_MEMORY_PATTERN =
+  /(?:做成页面|新闻页|新闻页面|固定格式|daily[- ]?news|国际国内热门新闻)/iu;
+
+const ORCHESTRATION_PREFIX_PATTERN =
+  /^【Memind 任务编排】[\s\S]*?用户任务：\s*/u;
+
+const MIN_SUBSTANTIVE_ASSISTANT_CHARS = 48;
+
+export function hasExplicitPageSourceReference(text) {
+  return PAGE_SOURCE_REFERENCE_PATTERN.test(String(text ?? '').trim());
+}
+
+export function isBareImmediatePageCreateRequest(text) {
+  const normalized = String(text ?? '').trim();
+  if (!normalized) return false;
+  if (!/(?:吧|呀|呢|一下)[。.!！\s]*$/u.test(normalized)) return false;
+  return (
+    /^(?:(?:请|麻烦|可以|能不能)\s*)?(?:(?:帮我|帮忙|给我)\s*)?(?:做|弄|改|转|写|排版|生成|制作)(?:成|为)?\s*(?:一个|个)?\s*(?:页面|网页)/iu.test(
+      normalized,
+    )
+    && !hasExplicitPageSourceReference(normalized)
+  );
+}
+
+export function stripOrchestrationFromAssistantText(text) {
+  return String(text ?? '')
+    .replace(ORCHESTRATION_PREFIX_PATTERN, '')
+    .trim();
+}
+
+export function extractSubstantiveAssistantText(text) {
+  const normalized = stripOrchestrationFromAssistantText(text);
+  if (normalized.length < MIN_SUBSTANTIVE_ASSISTANT_CHARS) return '';
+  if (/^(?:好的|收到|我先|让我|ok|let me)\b/iu.test(normalized) && normalized.length < 120) {
+    return '';
+  }
+  return normalized;
+}
+
+export function filterMemoryForImmediatePageContext(memories) {
+  if (!Array.isArray(memories) || memories.length === 0) return memories;
+  return memories.filter((entry) => {
+    const label = String(entry?.label ?? entry?.type ?? '').trim().toLowerCase();
+    const body = String(entry?.text ?? entry?.content ?? entry?.body ?? '').trim();
+    if (label === 'preference' && PAGE_TEMPLATE_MEMORY_PATTERN.test(body)) return false;
+    return true;
+  });
+}
+
+export function resolveWechatPageContinuationSource({
+  userText = '',
+  carriedSessionContent = '',
+  sessionAssistantContent = '',
+} = {}) {
+  const carried = extractSubstantiveAssistantText(carriedSessionContent);
+  if (carried) {
+    return { ok: true, sourceText: carried, source: 'carried_session' };
+  }
+  const inSession = extractSubstantiveAssistantText(sessionAssistantContent);
+  if (inSession) {
+    return { ok: true, sourceText: inSession, source: 'session_assistant' };
+  }
+  const normalized = String(userText ?? '').trim();
+  if (hasExplicitPageSourceReference(normalized) && normalized.length >= MIN_SUBSTANTIVE_ASSISTANT_CHARS) {
+    return { ok: true, sourceText: normalized, source: 'inline_user' };
+  }
+  return { ok: false, sourceText: '', source: 'missing' };
+}
+
+export function shouldFailFastWechatPageContinuation({
+  sessionPageContinuation = false,
+  userText = '',
+  carriedSessionContent = '',
+  sessionAssistantContent = '',
+} = {}) {
+  if (!sessionPageContinuation) return false;
+  if (!isBareImmediatePageCreateRequest(userText) && hasExplicitPageSourceReference(userText)) {
+    return !resolveWechatPageContinuationSource({
+      userText,
+      carriedSessionContent,
+      sessionAssistantContent,
+    }).ok;
+  }
+  if (!isBareImmediatePageCreateRequest(userText)) return false;
+  return !resolveWechatPageContinuationSource({
+    userText,
+    carriedSessionContent,
+    sessionAssistantContent,
+  }).ok;
+}
+
+export const WECHAT_PAGE_CONTINUATION_MISSING_SOURCE_TEXT =
+  '我没能确定您要把哪段内容做成页面。请一条消息发完整主题，或直接粘贴要做成页面的正文（例如诗词、文章全文）。';
+
+export function isWechatPageContinuationRepairableError(message) {
+  const normalized = String(message ?? '').trim();
+  if (!normalized) return false;
+  return (
+    /stale_session_poisoned_completion/i.test(normalized)
+    || /wechat_page_fresh_thumbnail_required:/i.test(normalized)
+    || /wechat_agent_incomplete_reply/i.test(normalized)
+    || /missing_page_artifact/i.test(normalized)
+    || /poisoned_or_fake_claim/i.test(normalized)
+    || /skill_or_stub/i.test(normalized)
+  );
+}
+
+export function extractLastSubstantiveAssistantFromConversation(messages = []) {
+  for (let index = messages.length - 1; index >= 0; index -= 1) {
+    const message = messages[index];
+    if (message?.role !== 'assistant') continue;
+    const text = extractSubstantiveAssistantText(
+      Array.isArray(message?.content)
+        ? message.content
+            .filter((item) => item?.type === 'text' && typeof item.text === 'string')
+            .map((item) => item.text)
+            .join('')
+        : String(message?.text ?? ''),
+    );
+    if (text) return text;
+  }
+  return '';
+}

wechat/page-continuation-context.test.mjs

@@ -0,0 +1,78 @@
+import assert from 'node:assert/strict';
+import test from 'node:test';
+
+import {
+  extractLastSubstantiveAssistantFromConversation,
+  extractSubstantiveAssistantText,
+  filterMemoryForImmediatePageContext,
+  hasExplicitPageSourceReference,
+  isBareImmediatePageCreateRequest,
+  isWechatPageContinuationRepairableError,
+  resolveWechatPageContinuationSource,
+  shouldFailFastWechatPageContinuation,
+} from './intent/page-continuation-context.mjs';
+
+test('detects bare vs explicit page continuation phrasing', () => {
+  assert.equal(hasExplicitPageSourceReference('帮我把这首词做成页面'), true);
+  assert.equal(hasExplicitPageSourceReference('帮我吧以上内容做成页面'), true);
+  assert.equal(isBareImmediatePageCreateRequest('帮我做成页面吧'), true);
+  assert.equal(isBareImmediatePageCreateRequest('帮我把这首词做成页面'), false);
+  assert.equal(isBareImmediatePageCreateRequest('帮我做个页面'), false);
+});
+
+test('resolveWechatPageContinuationSource prefers carried session content', () => {
+  const poem = '《临江仙·秋思》'.padEnd(60, '词');
+  const resolved = resolveWechatPageContinuationSource({
+    userText: '帮我做成页面吧',
+    carriedSessionContent: poem,
+  });
+  assert.equal(resolved.ok, true);
+  assert.equal(resolved.source, 'carried_session');
+});
+
+test('shouldFailFastWechatPageContinuation blocks bare follow-up without source', () => {
+  assert.equal(
+    shouldFailFastWechatPageContinuation({
+      sessionPageContinuation: true,
+      userText: '帮我做成页面吧',
+    }),
+    true,
+  );
+  assert.equal(
+    shouldFailFastWechatPageContinuation({
+      sessionPageContinuation: true,
+      userText: '帮我做成页面吧',
+      sessionAssistantContent: '《临江仙·秋思》'.padEnd(60, '。'),
+    }),
+    false,
+  );
+});
+
+test('filterMemoryForImmediatePageContext removes page template preferences', () => {
+  const filtered = filterMemoryForImmediatePageContext([
+    { label: 'preference', text: '用户要求每日新闻页面固定格式' },
+    { label: 'fact', text: '用户名字是唐' },
+  ]);
+  assert.equal(filtered.length, 1);
+  assert.match(filtered[0].text, /唐/);
+});
+
+test('extractLastSubstantiveAssistantFromConversation skips short acknowledgements', () => {
+  const text = extractLastSubstantiveAssistantFromConversation([
+    { role: 'user', content: [{ type: 'text', text: '写首词' }] },
+    { role: 'assistant', content: [{ type: 'text', text: '好的，我来写。' }] },
+    {
+      role: 'assistant',
+      content: [{
+        type: 'text',
+        text: `《临江仙·秋思》${'昨夜西风凋碧树，独上高楼，望尽天涯路。'.repeat(3)}`,
+      }],
+    },
+  ]);
+  assert.match(text, /临江仙/);
+});
+
+test('isWechatPageContinuationRepairableError covers fake delivery markers', () => {
+  assert.equal(isWechatPageContinuationRepairableError('stale_session_poisoned_completion'), true);
+  assert.equal(isWechatPageContinuationRepairableError('unknown variant `image_url`'), false);
+});

wechat/prompts/page-generate.mjs

@@ -14,6 +14,7 @@ export function buildPageGenerateAgentPrompt(
     wantsDocx = false,
     imagePolicy = null,
     preferImmediateContext = false,
+    carriedSessionContent = '',
   } = {},
 ) {
   const topic = String(intent?.agentText ?? intent?.displayText ?? '').trim();
@@ -41,6 +42,13 @@ export function buildPageGenerateAgentPrompt(
         '',
       ].join('\n')
     : '';
+  const carriedSessionBlock = String(carriedSessionContent ?? '').trim()
+    ? [
+        '【待排版正文（来自上一轮会话，必须以此为主题，禁止改用 Memory 或其他任务）】',
+        String(carriedSessionContent).trim(),
+        '',
+      ].join('\n')
+    : '';
   const coverExample = imageBlock
     ? '<本轮 generate_image 返回的 asset.htmlSrc>'
     : 'assets/hero.jpg';
@@ -62,6 +70,7 @@ export function buildPageGenerateAgentPrompt(
     docxBlock,
     imageBlock,
     immediateContextBlock,
+    carriedSessionBlock,
     pageDataBlock,
     '步骤（必须全部完成）：',
     pageDataTask