diff --git a/Assets/Tests/EditMode/AI/AiStateFragmentsTests.cs b/Assets/Tests/EditMode/AI/AiStateFragmentsTests.cs
index 65a5b6b9..2dcef846 100644
--- a/Assets/Tests/EditMode/AI/AiStateFragmentsTests.cs
+++ b/Assets/Tests/EditMode/AI/AiStateFragmentsTests.cs
@@ -64,5 +64,55 @@ namespace BaseGames.Tests.EditMode.AI
             ctx.S.Chase = false; ctx.S.Vision = true;
             Assert.IsFalse(AiStateFragments.LostAllZones(ctx));
         }
+
+        [Test]
+        public void Locomotion_StopsOnExit()
+        {
+            var ctx = new FakeAiContext();
+            var b = new BrainBuilder();
+            b.Entry("S");
+            AiStateFragments.Locomotion(b, "S", LocomotionMode.Patrol)
+                .To("Out").When(x => x.Sensor.InChaseZone(), "leave");
+            AiStateFragments.Terminal(b, "Out");
+            var rt = new AiRuntime(b.Build(), ctx);
+            Assert.AreEqual(LocomotionMode.Patrol, ctx.L.CurrentMode);
+
+            ctx.S.Chase = true;
+            rt.Tick(0.1f);
+            Assert.AreEqual("Out", rt.CurrentStateName);
+            CollectionAssert.Contains(ctx.L.Calls, "Stop");   // 离开时收尾
+        }
+
+        [Test]
+        public void Ability_InterruptsOnExit()
+        {
+            var ctx = new FakeAiContext();
+            var b = new BrainBuilder();
+            b.Entry("S");
+            AiStateFragments.Ability(b, "S", "atk")
+                .To("Out").When(x => x.Sensor.InChaseZone(), "leave");
+            AiStateFragments.Terminal(b, "Out");
+            var rt = new AiRuntime(b.Build(), ctx);
+            Assert.AreEqual("atk", ctx.C.Running);
+
+            ctx.S.Chase = true;
+            rt.Tick(0.1f);
+            Assert.AreEqual("Out", rt.CurrentStateName);
+            Assert.IsNull(ctx.C.Running);                     // InterruptAbilities() 已清空
+        }
+
+        [Test]
+        public void Ability_Throws_WhenAbilityIdEmpty()
+        {
+            var b = new BrainBuilder();
+            Assert.Throws<System.ArgumentException>(() => AiStateFragments.Ability(b, "S", ""));
+        }
+
+        [Test]
+        public void AbilityOnce_Throws_WhenAbilityIdNull()
+        {
+            var b = new BrainBuilder();
+            Assert.Throws<System.ArgumentException>(() => AiStateFragments.AbilityOnce(b, "S", null));
+        }
     }
 }
diff --git a/Assets/_Game/Scripts/Enemies/AIBrain/Modules/AiStateFragments.cs b/Assets/_Game/Scripts/Enemies/AIBrain/Modules/AiStateFragments.cs
index ce83ef01..92c33f94 100644
--- a/Assets/_Game/Scripts/Enemies/AIBrain/Modules/AiStateFragments.cs
+++ b/Assets/_Game/Scripts/Enemies/AIBrain/Modules/AiStateFragments.cs
@@ -25,17 +25,23 @@ namespace BaseGames.Enemies
         /// 用于追击、冲锋这类"只要还在这个状态就该一直在做"的能力。
         /// </summary>
         public static BrainBuilder.StateBuilder Ability(BrainBuilder b, string state, string abilityId)
-            => b.State(state)
+        {
+            RequireAbilityId(state, abilityId);
+            return b.State(state)
                 .OnEnter(x => EnsureAbility(x, abilityId))
                 .Tick  (x => EnsureAbility(x, abilityId))
                 .OnExit(x => x.Combat.InterruptAbilities());
+        }
 
         /// <summary>
         /// 由能力驱动的一次性态：只在进入时触发，不每帧重触发。
         /// 用于死亡等一次性演出——若用 Ability()，演出播完会被 Tick 无限重播。
         /// </summary>
         public static BrainBuilder.StateBuilder AbilityOnce(BrainBuilder b, string state, string abilityId)
-            => b.State(state).OnEnter(x => EnsureAbility(x, abilityId));
+        {
+            RequireAbilityId(state, abilityId);
+            return b.State(state).OnEnter(x => EnsureAbility(x, abilityId));
+        }
 
         /// <summary>
         /// 无行为的终态。不需要在这里停移动——转入本态时，上一个态的 OnExit 已经收尾。
@@ -50,10 +56,20 @@ namespace BaseGames.Enemies
             else                             x.Locomotion.SetMode(mode);
         }
 
+        // 建图期校验：空 id 会让状态存在却什么都不做——敌人杵着不动、无任何报错，
+        // 正是 BrainBuilder.RequireState 要防的同一类静默失败。放建图期而非运行时回调里，
+        // 既能快速失败，也省掉热路径上每帧一次的判空。
+        static void RequireAbilityId(string state, string abilityId)
+        {
+            if (string.IsNullOrEmpty(abilityId))
+                throw new ArgumentException(
+                    $"AiStateFragments: 状态 '{state}' 未配置能力 id。若该状态本就不需要能力" +
+                    "（如死亡演出交给物理状态机），请改用 Terminal()。", nameof(abilityId));
+        }
+
         static void EnsureAbility(IAiContext x, string abilityId)
         {
-            if (!string.IsNullOrEmpty(abilityId) && !x.Combat.IsAbilityRunning(abilityId))
-                x.Combat.UseAbility(abilityId);
+            if (!x.Combat.IsAbilityRunning(abilityId)) x.Combat.UseAbility(abilityId);
         }
     }
 }