diff --git a/Assets/_Game/Scripts/AI/AiState.cs b/Assets/_Game/Scripts/AI/AiState.cs
new file mode 100644
index 00000000..20019f7e
--- /dev/null
+++ b/Assets/_Game/Scripts/AI/AiState.cs
@@ -0,0 +1,17 @@
+using System;
+using System.Collections.Generic;
+
+namespace BaseGames.AI
+{
+    /// <summary>一个状态：进入/每帧/退出钩子 + 出边转换列表（按优先级有序，首个命中即转）。</summary>
+    public sealed class AiState
+    {
+        public string Name { get; }
+        public Action<IAiContext> OnEnter { get; internal set; }
+        public Action<IAiContext, float> OnTick { get; internal set; } // (ctx, dt)
+        public Action<IAiContext> OnExit { get; internal set; }
+        public List<Transition> Transitions { get; } = new List<Transition>();
+
+        public AiState(string name) => Name = name;
+    }
+}
diff --git a/Assets/_Game/Scripts/AI/AiState.cs.meta b/Assets/_Game/Scripts/AI/AiState.cs.meta
new file mode 100644
index 00000000..0e034bac
--- /dev/null
+++ b/Assets/_Game/Scripts/AI/AiState.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/_Game/Scripts/AI/Transition.cs b/Assets/_Game/Scripts/AI/Transition.cs
new file mode 100644
index 00000000..c87c651b
--- /dev/null
+++ b/Assets/_Game/Scripts/AI/Transition.cs
@@ -0,0 +1,29 @@
+using System;
+
+namespace BaseGames.AI
+{
+    /// <summary>一条转换：条件型（Condition 非空）或事件型（Event 非空）。二者互斥。</summary>
+    public sealed class Transition
+    {
+        public string Target { get; }
+        public Func<IAiContext, bool> Condition { get; }   // 条件型：pull，按 LOD 频率评估
+        public AiSignal? Event { get; }                    // 事件型：push，收到信号即触发
+        public string Label { get; }                        // 可读标签（显式字符串 / 事件名）
+
+        Transition(string target, Func<IAiContext, bool> condition, AiSignal? evt, string label)
+        {
+            Target = target;
+            Condition = condition;
+            Event = evt;
+            Label = label;
+        }
+
+        public static Transition OnCondition(string target, Func<IAiContext, bool> condition, string label)
+            => new Transition(target, condition, null, label);
+
+        public static Transition OnEvent(string target, AiSignal evt)
+            => new Transition(target, null, evt, "on " + evt);
+
+        public bool IsEvent => Event.HasValue;
+    }
+}
diff --git a/Assets/_Game/Scripts/AI/Transition.cs.meta b/Assets/_Game/Scripts/AI/Transition.cs.meta
new file mode 100644
index 00000000..3f19c1e6
--- /dev/null
+++ b/Assets/_Game/Scripts/AI/Transition.cs.meta
@@ -0,0 +1,11 @@
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diff --git a/Assets/_Game/Scripts/AI/TransitionRecord.cs b/Assets/_Game/Scripts/AI/TransitionRecord.cs
new file mode 100644
index 00000000..7c7912b2
--- /dev/null
+++ b/Assets/_Game/Scripts/AI/TransitionRecord.cs
@@ -0,0 +1,19 @@
+namespace BaseGames.AI
+{
+    /// <summary>一次已发生的转换，供调试器/MCP 自省"最近为何转换"。</summary>
+    public readonly struct TransitionRecord
+    {
+        public readonly string From;
+        public readonly string To;
+        public readonly string Trigger; // 条件标签或事件名
+
+        public TransitionRecord(string from, string to, string trigger)
+        {
+            From = from;
+            To = to;
+            Trigger = trigger;
+        }
+
+        public override string ToString() => $"{From} -> {To} : {Trigger}";
+    }
+}
diff --git a/Assets/_Game/Scripts/AI/TransitionRecord.cs.meta b/Assets/_Game/Scripts/AI/TransitionRecord.cs.meta
new file mode 100644
index 00000000..c4a6ce15
--- /dev/null
+++ b/Assets/_Game/Scripts/AI/TransitionRecord.cs.meta
@@ -0,0 +1,11 @@
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