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>
2026-08-02 18:49:42 +08:00
parent 55100f8945
commit c7dcc5d002
5 changed files with 439 additions and 7 deletions
@@ -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 '';
+}