优化标题生成功能

src/routes/chat.ts

@@ -564,6 +564,7 @@ export const buildChatRouter = (
           if (shouldGenerateTitle) {
             sessionTitle = await generateSessionTitle(runtime, {
               sessionId: binding.sessionId,
+              latestAssistantMessage: assistantText,
               latestUserMessage: parsed.data.message,
               fallbackTitle: existingSessionTitle,
             });

src/routes/chatSession.ts

@@ -12,15 +12,29 @@ const TITLE_CONTEXT_MESSAGE_CHAR_LIMIT = 240;
 const RESTORE_TURN_LIMIT = 8;
 const RESTORE_MESSAGE_CHAR_LIMIT = 480;
 const RESTORE_CONTEXT_CHAR_LIMIT = 3200;
+const DEFAULT_SESSION_TITLE = "新对话";
 
 const buildSessionTitle = (message: string) => {
   const normalized = message.replace(/\s+/g, " ").trim();
   if (!normalized) {
-    return "新对话";
+    return DEFAULT_SESSION_TITLE;
   }
   return normalized.length > 24 ? `${normalized.slice(0, 24)}...` : normalized;
 };
 
+const appendTitleContextMessage = (
+  lines: string[],
+  role: "用户" | "助手",
+  content: string | undefined,
+  maxLength = TITLE_CONTEXT_MESSAGE_CHAR_LIMIT,
+) => {
+  const normalized = content?.replace(/\s+/g, " ").trim();
+  if (!normalized) {
+    return;
+  }
+  lines.push(`${role}：${normalized.slice(0, maxLength)}`);
+};
+
 const buildTitleConversationContext = async (
   runtime: OpencodeRuntimeAdapter,
   sessionId: string,
@@ -67,7 +81,9 @@ const buildTitleConversationContext = async (
 const normalizeGeneratedTitle = (rawTitle: string, fallback: string) => {
   const normalized = rawTitle
     .replace(/\s+/g, " ")
+    .replace(/^标题[:：]\s*/i, "")
     .replace(/["'“”‘’`]/g, "")
+    .replace(/[。！？!?,，、；;：:]+$/g, "")
     .trim();
   if (!normalized) {
     return fallback;
@@ -85,13 +101,24 @@ export const generateSessionTitle = async (
   options: {
     sessionId: string;
     latestUserMessage: string;
+    latestAssistantMessage?: string;
     fallbackTitle?: string;
   },
 ) => {
-  const fallback = options.fallbackTitle?.trim() || buildSessionTitle(options.latestUserMessage);
+  const fallbackTitle = options.fallbackTitle?.trim();
+  const fallback =
+    fallbackTitle && fallbackTitle !== DEFAULT_SESSION_TITLE
+      ? fallbackTitle
+      : buildSessionTitle(options.latestUserMessage);
   let titleSessionId: string | undefined;
   try {
-    const conversation = await buildTitleConversationContext(runtime, options.sessionId);
+    const scopedContext: string[] = [];
+    appendTitleContextMessage(scopedContext, "用户", options.latestUserMessage, 480);
+    appendTitleContextMessage(scopedContext, "助手", options.latestAssistantMessage, 960);
+    const conversation =
+      scopedContext.length > 0
+        ? scopedContext.join("\n")
+        : await buildTitleConversationContext(runtime, options.sessionId);
     if (!conversation) {
       return fallback;
     }
@@ -104,8 +131,9 @@ export const generateSessionTitle = async (
         [
           "你是会话标题生成器。",
           "请根据下面整段多轮对话生成一个 8-16 字中文标题。",
-          "要求：简洁、可读、避免标点、不要引号、不要解释。",
-          "先理解完整对话，再概括核心任务或结论。",
+          "要求：简洁、具体、可读、避免标点、不要引号、不要解释。",
+          "优先概括用户当前真实需求和助手最终结论。",
+          "忽略系统提示、历史记忆、学习上下文、工具日志等元信息。",
           "不要直接照抄用户任一条消息原文。",
           "只输出标题本身。",
           "",