diff --git a/app/prompt/intent.py b/app/prompt/intent.py
index e1ad154..4b147fb 100644
--- a/app/prompt/intent.py
+++ b/app/prompt/intent.py
@@ -10,7 +10,8 @@ def build_intent_question() -> ChoiceDecision:
             "Classify the user's primary intent. "
             "Read `prompt` together with `clarification_history`; later answers clarify or correct earlier requests. "
             "Choose modify_screen only when the user explicitly requests an actual edit. "
-            "Choose qa only for an explicit request for information, explanation, diagnosis, or advice. "
+            "Choose qa for clear requests for a textual answer or general conversation, including information, explanation, diagnosis, advice, and assistant identity or capabilities. "
+            "Requests need not be phrased as questions; being unrelated to screens does not make an intent unclear. "
             "A vague complaint or evaluation without a requested next step is unclear, not automatically qa. "
             "An explicit edit request remains modify_screen even when edit details are missing. "
             "Do not infer intent solely from selected nodes or an empty screen."
@@ -20,9 +21,9 @@ def build_intent_question() -> ChoiceDecision:
             "create_screen": "Create a new screen",
             # 明确要求修改、增加、删除或重新设计已有大屏
             "modify_screen": "Explicitly request modifying, adding, deleting, or redesigning an existing screen, including requests lacking details such as 帮我修改这个图",
-            # 询问知识、原因、建议或如何修改，但没有要求实际执行
-            "qa": "Explicitly ask for information, reasons, diagnosis, or suggestions without requesting an actual edit, e.g. 这个图为什么没有数据 or 这个图怎么优化",
+            # 明确的文字回答或交流请求，包括助手身份和能力，但没有要求实际操作大屏
+            "qa": "Clearly request a textual answer or general conversation without requesting screen creation or an actual edit; includes assistant identity and capabilities, information, reasons, diagnosis, and suggestions, e.g. 这个图为什么没有数据 or 这个图怎么优化",
             # 语义上没有明确表达要问什么或做什么，不等同于模型分数低
-            "unclear": "The requested intent is not expressed clearly: vague feedback, references, or an unspecified request to look, e.g. 这个图不太对, 这个有点问题, 帮我看看这个; no explicit question or edit request",
+            "unclear": "The user's desired response or action cannot be determined from the request and clarification history, so clarification is needed to decide what to do; includes vague feedback, references, or an unspecified request to look, e.g. 这个图不太对, 这个有点问题, 帮我看看这个",
         },
     )
diff --git a/app/prompt/qa.py b/app/prompt/qa.py
index 0a42159..5d0af69 100644
--- a/app/prompt/qa.py
+++ b/app/prompt/qa.py
@@ -2,9 +2,11 @@
 
 QA_SYSTEM_PROMPT = """## 任务
 回答用户关于大屏的问题，或提供具体可操作的改进建议
+也可回答助手身份、能力等一般交流请求；介绍自己时以大屏助手的职责和已知能力为依据，不编造模型身份或未提供的能力
 
 ## 回答依据
 结合当前问题、大屏快照和 clarification_history，以用户后续明确补充或纠正为准
+仅在与请求相关时使用大屏快照；一般交流无需强行关联大屏或要求用户补充大屏信息
 区分快照事实与待验证的推测，证据不足时说明缺少的信息，不编造故障原因
 
 ## 输出与边界