diff --git a/plugins/ai_auto_response/core/reply_formatter.py b/plugins/ai_auto_response/core/reply_formatter.py
index 616e250..4330f3f 100644
--- a/plugins/ai_auto_response/core/reply_formatter.py
+++ b/plugins/ai_auto_response/core/reply_formatter.py
@@ -12,11 +12,12 @@ def finalize_reply(response: str, reply_mode: str) -> List[str]:
     text = text.replace("\n", " ").strip()
 
     if reply_mode == "social_short":
-        return split_reply_chunks(text, sentence_limit=1, char_limit=48, chunk_limit=1, allow_clip_split=False)
+        # 社交短句允许拆成两条，避免长句被硬截断成半句。
+        return split_reply_chunks(text, sentence_limit=2, char_limit=48, chunk_limit=2, allow_clip_split=True)
     if reply_mode == "qa_fast":
-        return split_reply_chunks(text, sentence_limit=2, char_limit=42, chunk_limit=2, allow_clip_split=False)
+        return split_reply_chunks(text, sentence_limit=2, char_limit=42, chunk_limit=2, allow_clip_split=True)
     if reply_mode == "qa_with_context":
-        return split_reply_chunks(text, sentence_limit=2, char_limit=54, chunk_limit=2, allow_clip_split=False)
+        return split_reply_chunks(text, sentence_limit=2, char_limit=54, chunk_limit=2, allow_clip_split=True)
     return [take_first_sentence(text, 28).strip()]
 
 
@@ -29,7 +30,7 @@ def preview_text(text: str, limit: int = 80) -> str:
 
 def build_length_rule(reply_mode: str) -> str:
     if reply_mode == "social_short":
-        return "默认只回1句短话，尽量简短，但必须表达完整；通常控制在8到24个字，必要时可以放宽到一整句短句，别截半句。"
+        return "默认优先1句短话；必要时可以拆成2条短消息，保证语义完整，不要截半句。"
     if reply_mode == "qa_fast":
         return "优先1句话；如果确实需要，可以拆成2条短消息发出，每条尽量控制在42字内，先给结论，不要主动补第二层解释。"
     if reply_mode == "qa_with_context":
@@ -90,7 +91,7 @@ def smart_clip(text: str, limit: int) -> str:
     weak_punctuation = "，,、；;：:"
     split_at = _find_split_at(window, strong_punctuation)
     if split_at < 0:
-        split_at = _find_split_at(window, weak_punctuation, lookback=4)
+        split_at = _find_split_at(window, weak_punctuation, lookback=12)
     if split_at >= 0:
         return window[:split_at].rstrip("，,、；;：:。！？!? ").strip()
     return window.rstrip("，,、；;：: ").strip()