diff --git a/GFramework.Game.Abstractions/README.md b/GFramework.Game.Abstractions/README.md
index 9bcd011e..66954e80 100644
--- a/GFramework.Game.Abstractions/README.md
+++ b/GFramework.Game.Abstractions/README.md
@@ -281,6 +281,7 @@ public sealed class ContinueGameCommandHandler
 - 序列化系统：[序列化系统](../docs/zh-CN/game/serialization.md)
 - 场景系统：[场景系统](../docs/zh-CN/game/scene.md)
 - UI 系统：[UI 系统](../docs/zh-CN/game/ui.md)
+- 输入系统：[输入系统](../docs/zh-CN/game/input.md)
 
 ## 选择建议
 
diff --git a/GFramework.Game.Tests/Input/InputBindingStoreTests.cs b/GFramework.Game.Tests/Input/InputBindingStoreTests.cs
index 596283fd..5f3cc671 100644
--- a/GFramework.Game.Tests/Input/InputBindingStoreTests.cs
+++ b/GFramework.Game.Tests/Input/InputBindingStoreTests.cs
@@ -56,6 +56,25 @@ public sealed class InputBindingStoreTests
             Is.EqualTo("key:65"));
     }
 
+    /// <summary>
+    ///     验证查询不存在的动作时，不会把空条目写回当前快照。
+    /// </summary>
+    [Test]
+    public void GetBindings_WhenActionMissing_Should_NotMutateSnapshot()
+    {
+        var store = CreateStore();
+
+        var missingBindings = store.GetBindings("jump");
+        var snapshot = store.ExportSnapshot();
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(missingBindings.ActionName, Is.EqualTo("jump"));
+            Assert.That(missingBindings.Bindings, Is.Empty);
+            Assert.That(snapshot.Actions.Any(action => string.Equals(action.ActionName, "jump", StringComparison.Ordinal)), Is.False);
+        });
+    }
+
     private static InputBindingStore CreateStore()
     {
         return new InputBindingStore(
diff --git a/GFramework.Game/Input/InputBindingStore.cs b/GFramework.Game/Input/InputBindingStore.cs
index 3cf47a50..8cad92a2 100644
--- a/GFramework.Game/Input/InputBindingStore.cs
+++ b/GFramework.Game/Input/InputBindingStore.cs
@@ -30,8 +30,11 @@ public sealed class InputBindingStore : IInputBindingStore
     /// <inheritdoc />
     public InputActionBinding GetBindings(string actionName)
     {
-        var bindings = GetOrCreateBindings(actionName);
-        return new InputActionBinding(actionName, bindings.ToArray());
+        ArgumentException.ThrowIfNullOrWhiteSpace(actionName);
+
+        return _currentBindings.TryGetValue(actionName, out var bindings)
+            ? new InputActionBinding(actionName, bindings.ToArray())
+            : new InputActionBinding(actionName, Array.Empty<InputBindingDescriptor>());
     }
 
     /// <inheritdoc />
diff --git a/GFramework.Game/Input/InputDeviceTracker.cs b/GFramework.Game/Input/InputDeviceTracker.cs
index f17c9ba8..48fc5af3 100644
--- a/GFramework.Game/Input/InputDeviceTracker.cs
+++ b/GFramework.Game/Input/InputDeviceTracker.cs
@@ -19,12 +19,21 @@ public sealed class InputDeviceTracker : IInputDeviceTracker
     }
 
     /// <inheritdoc />
+    /// <remarks>
+    ///     该属性不提供额外同步原语。
+    ///     宿主应在同一输入线程内调用 <see cref="Update" /> 并读取当前值，例如 Godot 的主线程或输入事件线程。
+    /// </remarks>
     public InputDeviceContext CurrentDevice { get; private set; }
 
     /// <summary>
     ///     使用新的宿主设备上下文覆盖当前状态。
     /// </summary>
     /// <param name="context">新的设备上下文。</param>
+    /// <remarks>
+    ///     该方法设计给宿主输入线程串行调用。
+    ///     如果宿主需要跨线程读取设备上下文，应在外层提供自己的同步策略，而不是依赖此类型完成可见性保证。
+    /// </remarks>
+    /// <exception cref="ArgumentNullException">当 <paramref name="context" /> 为 <see langword="null" /> 时抛出。</exception>
     public void Update(InputDeviceContext context)
     {
         CurrentDevice = context ?? throw new ArgumentNullException(nameof(context));
diff --git a/GFramework.Game/Input/UiInputDispatcher.cs b/GFramework.Game/Input/UiInputDispatcher.cs
index f6d432b3..f5418aa9 100644
--- a/GFramework.Game/Input/UiInputDispatcher.cs
+++ b/GFramework.Game/Input/UiInputDispatcher.cs
@@ -19,6 +19,8 @@ public sealed class UiInputDispatcher : IUiInputDispatcher
     /// </summary>
     /// <param name="actionMap">动作映射表。</param>
     /// <param name="router">目标 UI 路由器。</param>
+    /// <exception cref="ArgumentNullException">当 <paramref name="actionMap" /> 为 <see langword="null" /> 时抛出。</exception>
+    /// <exception cref="ArgumentNullException">当 <paramref name="router" /> 为 <see langword="null" /> 时抛出。</exception>
     public UiInputDispatcher(IUiInputActionMap actionMap, IUiRouter router)
     {
         _actionMap = actionMap ?? throw new ArgumentNullException(nameof(actionMap));
diff --git a/GFramework.Game/README.md b/GFramework.Game/README.md
index 6b19288f..2e55e53a 100644
--- a/GFramework.Game/README.md
+++ b/GFramework.Game/README.md
@@ -372,6 +372,7 @@ public sealed class MyUiRouter : UiRouterBase
 - 序列化系统：[序列化系统](../docs/zh-CN/game/serialization.md)
 - 场景系统：[场景系统](../docs/zh-CN/game/scene.md)
 - UI 系统：[UI 系统](../docs/zh-CN/game/ui.md)
+- 输入系统：[输入系统](../docs/zh-CN/game/input.md)
 
 ## 什么时候不该直接依赖本包
 
diff --git a/GFramework.Godot.Tests/Input/GodotInputBindingStoreTests.cs b/GFramework.Godot.Tests/Input/GodotInputBindingStoreTests.cs
index f5d910c1..731d112c 100644
--- a/GFramework.Godot.Tests/Input/GodotInputBindingStoreTests.cs
+++ b/GFramework.Godot.Tests/Input/GodotInputBindingStoreTests.cs
@@ -82,6 +82,63 @@ public sealed class GodotInputBindingStoreTests
         Assert.That(acceptBindings.Bindings[0].Code, Is.EqualTo("key:32"));
     }
 
+    /// <summary>
+    ///     验证导入快照时，会清空快照中未出现动作的后端绑定。
+    /// </summary>
+    [Test]
+    public void ImportSnapshot_WhenActionMissingFromSnapshot_Should_ClearBackendBindings()
+    {
+        var backend = new FakeInputMapBackend(
+            new InputBindingSnapshot(
+            [
+                new InputActionBinding(
+                    "ui_accept",
+                    [
+                        new InputBindingDescriptor(
+                            InputDeviceKind.KeyboardMouse,
+                            InputBindingKind.Key,
+                            "key:13",
+                            "Enter")
+                    ]),
+                new InputActionBinding(
+                    "ui_cancel",
+                    [
+                        new InputBindingDescriptor(
+                            InputDeviceKind.KeyboardMouse,
+                            InputBindingKind.Key,
+                            "key:27",
+                            "Escape")
+                    ])
+            ]));
+
+        var store = new GodotInputBindingStore(backend);
+        store.ImportSnapshot(
+            new InputBindingSnapshot(
+            [
+                new InputActionBinding(
+                    "ui_accept",
+                    [
+                        new InputBindingDescriptor(
+                            InputDeviceKind.KeyboardMouse,
+                            InputBindingKind.Key,
+                            "key:32",
+                            "Space")
+                    ])
+            ]));
+
+        var snapshot = store.ExportSnapshot();
+
+        Assert.Multiple(() =>
+        {
+            Assert.That(
+                snapshot.Actions.Single(action => string.Equals(action.ActionName, "ui_accept", StringComparison.Ordinal)).Bindings[0].Code,
+                Is.EqualTo("key:32"));
+            Assert.That(
+                snapshot.Actions.Single(action => string.Equals(action.ActionName, "ui_cancel", StringComparison.Ordinal)).Bindings,
+                Is.Empty);
+        });
+    }
+
     /// <summary>
     ///     验证从纯托管绑定设置主绑定时，会保留 `Game` 层冲突交换语义。
     /// </summary>
diff --git a/GFramework.Godot/Input/GodotInputBindingStore.cs b/GFramework.Godot/Input/GodotInputBindingStore.cs
index 2966a8c2..af471746 100644
--- a/GFramework.Godot/Input/GodotInputBindingStore.cs
+++ b/GFramework.Godot/Input/GodotInputBindingStore.cs
@@ -61,10 +61,25 @@ public sealed class GodotInputBindingStore : IInputBindingStore, IInputDeviceTra
         ArgumentNullException.ThrowIfNull(snapshot);
 
         ReloadFromBackend();
+        var snapshotActionNames = snapshot.Actions
+            .Select(static action => action.ActionName)
+            .ToHashSet(StringComparer.Ordinal);
+        var removedActionNames = _state.ExportSnapshot().Actions
+            .Select(static action => action.ActionName)
+            .Where(actionName => !snapshotActionNames.Contains(actionName))
+            .ToArray();
+
+        foreach (var actionName in removedActionNames)
+        {
+            _backend.SetBindings(actionName, Array.Empty<InputBindingDescriptor>());
+        }
+
         foreach (var action in snapshot.Actions)
         {
             ApplyActionBindings(action);
         }
+
+        ReloadFromBackend();
     }
 
     /// <inheritdoc />
diff --git a/GFramework.Godot/Input/GodotInputMapBackend.cs b/GFramework.Godot/Input/GodotInputMapBackend.cs
index 9741ca82..49c7c84c 100644
--- a/GFramework.Godot/Input/GodotInputMapBackend.cs
+++ b/GFramework.Godot/Input/GodotInputMapBackend.cs
@@ -32,6 +32,13 @@ internal sealed class GodotInputMapBackend : IGodotInputMapBackend
     /// <inheritdoc />
     public IReadOnlyList<InputBindingDescriptor> GetBindings(string actionName)
     {
+        ArgumentException.ThrowIfNullOrWhiteSpace(actionName);
+
+        if (!InputMap.HasAction(actionName))
+        {
+            return Array.Empty<InputBindingDescriptor>();
+        }
+
         var bindings = new List<InputBindingDescriptor>();
         foreach (var inputEvent in InputMap.ActionGetEvents(actionName))
         {
@@ -73,7 +80,10 @@ internal sealed class GodotInputMapBackend : IGodotInputMapBackend
             return;
         }
 
-        InputMap.ActionEraseEvents(actionName);
+        if (InputMap.HasAction(actionName))
+        {
+            InputMap.ActionEraseEvents(actionName);
+        }
     }
 
     /// <inheritdoc />
diff --git a/GFramework.Godot/Input/IGodotInputMapBackend.cs b/GFramework.Godot/Input/IGodotInputMapBackend.cs
index 03b80318..84db77a8 100644
--- a/GFramework.Godot/Input/IGodotInputMapBackend.cs
+++ b/GFramework.Godot/Input/IGodotInputMapBackend.cs
@@ -13,27 +13,31 @@ internal interface IGodotInputMapBackend
     /// <summary>
     ///     获取当前 `InputMap` 中的动作名。
     /// </summary>
-    /// <returns>动作名列表。</returns>
+    /// <returns>动作名列表；永远不会返回 <see langword="null" />。</returns>
     IReadOnlyList<string> GetActionNames();
 
     /// <summary>
     ///     获取指定动作的框架绑定描述集合。
     /// </summary>
-    /// <param name="actionName">动作名称。</param>
-    /// <returns>框架绑定描述集合。</returns>
+    /// <param name="actionName">动作名称，不能为 <see langword="null" /> 或空白字符串。</param>
+    /// <returns>框架绑定描述集合；永远不会返回 <see langword="null" />。</returns>
+    /// <exception cref="ArgumentException">当 <paramref name="actionName" /> 为 <see langword="null" /> 或空白字符串时抛出。</exception>
     IReadOnlyList<InputBindingDescriptor> GetBindings(string actionName);
 
     /// <summary>
     ///     用给定绑定集合替换动作当前绑定。
     /// </summary>
-    /// <param name="actionName">动作名称。</param>
-    /// <param name="bindings">新的绑定集合。</param>
+    /// <param name="actionName">动作名称，不能为 <see langword="null" /> 或空白字符串。</param>
+    /// <param name="bindings">新的绑定集合，不能为 <see langword="null" />，但可以为空集合。</param>
+    /// <exception cref="ArgumentException">当 <paramref name="actionName" /> 为 <see langword="null" /> 或空白字符串时抛出。</exception>
+    /// <exception cref="ArgumentNullException">当 <paramref name="bindings" /> 为 <see langword="null" /> 时抛出。</exception>
     void SetBindings(string actionName, IReadOnlyList<InputBindingDescriptor> bindings);
 
     /// <summary>
     ///     将指定动作恢复为项目默认绑定。
     /// </summary>
-    /// <param name="actionName">动作名称。</param>
+    /// <param name="actionName">动作名称，不能为 <see langword="null" /> 或空白字符串。</param>
+    /// <exception cref="ArgumentException">当 <paramref name="actionName" /> 为 <see langword="null" /> 或空白字符串时抛出。</exception>
     void ResetAction(string actionName);
 
     /// <summary>
diff --git a/ai-plan/public/input-system-godot-integration/todos/input-system-godot-integration-tracking.md b/ai-plan/public/input-system-godot-integration/todos/input-system-godot-integration-tracking.md
index d0f23655..a69cc020 100644
--- a/ai-plan/public/input-system-godot-integration/todos/input-system-godot-integration-tracking.md
+++ b/ai-plan/public/input-system-godot-integration/todos/input-system-godot-integration-tracking.md
@@ -14,11 +14,14 @@ Godot `InputMap` 适配，优先服务 UI 语义动作桥接和绑定重映射
   - 已新增 `GFramework.Game.Input` 默认运行时，覆盖纯托管绑定存储、设备上下文持有者和逻辑动作到 `UiInputAction` 的桥接
   - 已新增 `GFramework.Godot.Input` 适配层，覆盖 `InputMap` 绑定读写与 descriptor-based backend 桥接
   - 已补 `Game.Tests` 与 `Godot.Tests` 的新增回归，并补 `docs/zh-CN/game/input.md` 与 `docs/zh-CN/godot/input.md`
+  - 已处理 PR `#346` 的首轮 review follow-up，修复只读查询污染快照与 Godot 导入快照残留绑定问题，并补齐 README / XML / `ai-plan` 收尾
 
 ## 当前状态摘要
 
 - 统一输入抽象已建立，但当前仍聚焦动作绑定和 UI 输入桥接，不尝试覆盖完整 gameplay input runtime
 - `GodotInputBindingStore` 当前把 `InputMap` 默认绑定和主绑定替换接到框架抽象，允许导出 / 导入 `InputBindingSnapshot`
+- `InputBindingStore.GetBindings(...)` 已改为纯读取语义，不再因查询缺失动作而把空条目带进导出快照
+- `GodotInputBindingStore.ImportSnapshot(...)` 已改为快照级覆盖语义，会清空快照中未出现动作的后端绑定
 - `project.godot -> InputActions` 生成器链路保持不变，新的输入系统直接复用动作名常量，而不是替代它
 
 ## 当前风险
@@ -40,9 +43,12 @@ Godot `InputMap` 适配，优先服务 UI 语义动作桥接和绑定重映射
   - 结果：通过
 - `dotnet test GFramework.Godot.Tests/GFramework.Godot.Tests.csproj -c Release --filter "FullyQualifiedName~GodotInputBindingStoreTests" -m:1 -p:RestoreFallbackFolders= -nodeReuse:false`
   - 结果：通过
+- `python3 scripts/license-header.py --check --paths GFramework.Game.Abstractions/README.md GFramework.Game.Tests/Input/InputBindingStoreTests.cs GFramework.Game/Input/InputBindingStore.cs GFramework.Game/Input/InputDeviceTracker.cs GFramework.Game/Input/UiInputDispatcher.cs GFramework.Game/README.md GFramework.Godot.Tests/Input/GodotInputBindingStoreTests.cs GFramework.Godot/Input/GodotInputBindingStore.cs GFramework.Godot/Input/GodotInputMapBackend.cs GFramework.Godot/Input/IGodotInputMapBackend.cs ai-plan/public/input-system-godot-integration/traces/input-system-godot-integration-trace.md`
+  - 结果：待本轮验证补录
 
 ## 下一步
 
 1. 若继续扩展输入系统，优先补更多逻辑动作与 gameplay 输入场景，而不是先扩面到品牌图标、震动预设或平台文案
 2. 若要增强 Godot 宿主覆盖，优先补真实 `InputMap` / `InputEvent` 集成测试宿主，而不是把更多原生对象直接放进普通 `dotnet test`
 3. 若要开放给消费者使用，继续完善 `README.md`、模块 README 与教程中的采用路径示例
+4. 若继续处理 PR review，可再评估值对象改成 `record` 的收益与兼容性，而不是把该风格建议与行为修复混在同一波提交
diff --git a/ai-plan/public/input-system-godot-integration/traces/input-system-godot-integration-trace.md b/ai-plan/public/input-system-godot-integration/traces/input-system-godot-integration-trace.md
index be4ecbe4..58d5b82b 100644
--- a/ai-plan/public/input-system-godot-integration/traces/input-system-godot-integration-trace.md
+++ b/ai-plan/public/input-system-godot-integration/traces/input-system-godot-integration-trace.md
@@ -4,8 +4,8 @@
 
 ### 阶段：统一输入抽象与 Godot 适配首轮落地（RP-001）
 
-- 创建长分支 `feat/input-system-godot-integration`，并在 `GFramework-WorkTree/GFramework-input-system-godot-integration`
-  建立独立 worktree
+- 创建长分支 `feat/input-system-godot-integration`，并在 `feat/input-system-godot-integration#346`
+  上推进独立实现与验证
 - 在 `GFramework.Game.Abstractions/Input/` 新增：
   - `InputBindingDescriptor`
   - `InputActionBinding`
@@ -48,3 +48,27 @@
 
 1. 若继续推进输入系统，优先定义更多逻辑动作与 gameplay 输入桥接，而不是先扩到宿主品牌文案
 2. 若要增强 Godot 验证，单独准备真实 `InputMap` / `InputEvent` 集成宿主，而不是依赖普通 VSTest process
+
+## 2026-05-11
+
+### 阶段：PR #346 review follow-up（RP-001）
+
+- 核对当前分支 PR `#346` 的 CodeRabbit review，确认以下问题仍然适用于本地代码：
+  - `InputBindingStore.GetBindings(...)` 读取缺失动作时会隐式创建空条目，并污染 `ExportSnapshot()`
+  - `GodotInputBindingStore.ImportSnapshot(...)` 只覆盖快照内动作，未清空后端残留绑定
+  - `InputDeviceTracker` / `UiInputDispatcher` / `IGodotInputMapBackend` 的 XML 文档缺少线程或异常契约
+  - `GFramework.Game.Abstractions/README.md` 与 `GFramework.Game/README.md` 缺少输入系统文档入口
+  - 公开 trace 中仍包含 worktree 目录名，已改为 `feat/input-system-godot-integration#346`
+- 本轮未跟进 `InputBindingDescriptor`、`InputActionBinding`、`InputBindingSnapshot`、`InputDeviceContext` 改成 `record` 的 nitpick
+  - 原因：这些建议偏向值语义风格统一，不是当前 PR 中已验证的行为缺陷；本轮优先收敛真实回归风险与契约缺口
+- 新增回归测试：
+  - `InputBindingStoreTests.GetBindings_WhenActionMissing_Should_NotMutateSnapshot`
+  - `GodotInputBindingStoreTests.ImportSnapshot_WhenActionMissingFromSnapshot_Should_ClearBackendBindings`
+- 验证结果：
+  - `dotnet test GFramework.Game.Tests/GFramework.Game.Tests.csproj -c Release --filter "FullyQualifiedName~InputBindingStoreTests|FullyQualifiedName~UiInputDispatcherTests"` 通过
+  - `dotnet test GFramework.Godot.Tests/GFramework.Godot.Tests.csproj -c Release --filter "FullyQualifiedName~GodotInputBindingStoreTests"` 通过
+
+### 下一步
+
+1. 运行针对本次改动文件的 license-header 检查并补录结果
+2. 如需继续消化 PR review，再单独评估值对象切换到 `record` 是否值得放进同一个 PR