diff --git a/skillagent/agent.py b/skillagent/agent.py
index 972ca16..001c2db 100644
--- a/skillagent/agent.py
+++ b/skillagent/agent.py
@@ -26,6 +26,7 @@ class SkillDecision:
 	skill: str
 	script: str
 	params: dict
+	missing_params: list
 	reason: Optional[str] = None
 
 @dataclass
@@ -116,17 +117,19 @@ class Agent:
 		self.load_skills()
 		candidates = await self._candidate_skills(user_text)
 		decision = await self._plan_with_candidates(user_text, candidates)
-		try:
-			debug(f'{decision=}')
-			validated_params = self._validate_params(decision)
-		except MissingParams as e:
-			question = await self._ask_user_for_params(user_text, decision.skill, decision.script, e.fields)
+		if decision.missing_params != []:
+			question = await self._ask_user_for_params(
+					user_text, 
+					decision.skill, 
+					decision.script, 
+					decision.missing_params
+			)
 			state = PlanState(
 				user_intent=user_text,
 				skill=decision.skill,
 				script=decision.script,
 				params=decision.params,
-				missing=e.fields
+				missing=decision.missing_params
 			)
 			return {
 				"type": "clarification", 
diff --git a/skillagent/tmpls.py b/skillagent/tmpls.py
index e28b74b..3b1fcd9 100644
--- a/skillagent/tmpls.py
+++ b/skillagent/tmpls.py
@@ -36,7 +36,6 @@ Output:
 1. 选择最符合用户需求的技能脚本
 
 规则
-- 如果一个需要的参数缺失，设为null
 - 只输出JSON
 
 输出：
@@ -44,6 +43,7 @@ Output:
   "skill": "...",
   "script": "...",
   "params": {},
+  "missing_params":[...],
   "reason": "..."
 }
 """