diff --git a/packages-user/data-common/src/replay/array.test.ts b/packages-user/data-common/src/replay/array.test.ts
index 3ce3db9..e36565f 100644
--- a/packages-user/data-common/src/replay/array.test.ts
+++ b/packages-user/data-common/src/replay/array.test.ts
@@ -167,6 +167,25 @@ function expectRouteStream(
     expect(stream.index).toBe(expectedSteps.length);
 }
 
+// 执行越界编辑并对比前后全部可观测状态：长度、两个缓冲区字节与每一步解码结果，返回本次告警码
+function expectArrayUnchanged(array: ReplayArray, run: () => void): number[] {
+    const length = array.length;
+    const commands = new Uint8Array(array.getCommandArray()).slice();
+    const params = new Uint8Array(array.getParamArray()).slice();
+    const steps = Array.from({ length }, (_, i) => array.get(i));
+
+    const { info } = logger.catch(run);
+
+    expect(array.length).toBe(length);
+    expect(new Uint8Array(array.getCommandArray())).toEqual(commands);
+    expect(new Uint8Array(array.getParamArray())).toEqual(params);
+    expect(
+        Array.from({ length: array.length }, (_, i) => array.get(i))
+    ).toEqual(steps);
+
+    return info.map(v => v.code!);
+}
+
 describe('ReplayArray single operations', () => {
     // 验证 add 追加一条录像步并在原索引读回指令与参数
     it('appends one step and reads it back at the original index', () => {
@@ -357,6 +376,76 @@ describe('ReplayArray set index maintenance', () => {
     });
 });
 
+describe('ReplayArray index bounds', () => {
+    // 验证 insert 传入当前总步数时按末尾追加处理，追加后按索引与读流读回结果一致
+    it('appends when the insert index equals the current length', () => {
+        const array = createArray();
+        array.add(1, [10]);
+        array.add(2, [20]);
+
+        array.insert(array.length, 3, [30]);
+
+        expect(array.length).toBe(3);
+        expect(array.get(2)).toEqual({ command: 3, params: [30], index: 2 });
+        const stream = array.createReadStream(0);
+        expectStepTyped(stream.read()!, 1, [10], 1);
+        expectStepTyped(stream.read()!, 2, [20], 2);
+        expectStepTyped(stream.read()!, 3, [30], 3);
+        expect(stream.read()).toBeNull();
+    });
+
+    // 验证 insert 负索引与超出总步数的索引触发告警码 179 且不修改任何缓冲区内容
+    it('warns code 179 and keeps the buffers unchanged for an out-of-range insert', () => {
+        const array = createHeterogeneousArray();
+
+        for (const index of [-1, array.length + 1]) {
+            const codes = expectArrayUnchanged(array, () =>
+                array.insert(index, 9, [true, 5])
+            );
+            expect(codes).toContain(179);
+        }
+    });
+
+    // 验证 delete 负索引与等于总步数的索引触发告警码 179 且不修改任何缓冲区内容
+    it('warns code 179 and keeps the buffers unchanged for an out-of-range delete', () => {
+        const array = createHeterogeneousArray();
+
+        for (const index of [-1, array.length]) {
+            const codes = expectArrayUnchanged(array, () =>
+                array.delete(index)
+            );
+            expect(codes).toContain(179);
+        }
+    });
+
+    // 验证 set 负索引与等于总步数的索引触发告警码 179 且不修改任何缓冲区内容
+    it('warns code 179 and keeps the buffers unchanged for an out-of-range set', () => {
+        const array = createHeterogeneousArray();
+
+        for (const index of [-1, array.length]) {
+            const codes = expectArrayUnchanged(array, () =>
+                array.set(index, 9, [true, 5])
+            );
+            expect(codes).toContain(179);
+        }
+    });
+
+    // 验证空录像上的 delete 与 set 一律按越界处理，既不告警 179 之外的内容也不产生录像步
+    it('treats every index as out of range on an empty route', () => {
+        const array = createArray();
+
+        for (const index of [0, -1]) {
+            expect(
+                expectArrayUnchanged(array, () => array.delete(index))
+            ).toContain(179);
+        }
+        expect(
+            expectArrayUnchanged(array, () => array.set(0, 1, [10]))
+        ).toContain(179);
+        expect(array.length).toBe(0);
+    });
+});
+
 describe('ReplayArray param codec', () => {
     // 验证 boolean 参数按 type 0 写入并读回布尔值
     it('round-trips boolean parameters', () => {
diff --git a/packages-user/data-common/src/replay/array.ts b/packages-user/data-common/src/replay/array.ts
index 5ade216..65dd381 100644
--- a/packages-user/data-common/src/replay/array.ts
+++ b/packages-user/data-common/src/replay/array.ts
@@ -436,14 +436,36 @@ export class ReplayArray implements IReplayArray {
 
     insert(index: number, command: number, params: ReplayParamValue[]): void {
         if (this.disabled > 0) return;
+        if (index < 0 || index > this.length) {
+            logger.warn(
+                179,
+                'insert',
+                index.toString(),
+                this.length.toString()
+            );
+            return;
+        }
         const normalized = this.normalizeParamList(params);
         const length = this.calculateParamsLength(normalized);
         this.checkBufferExpand(length);
 
         const commandSize = this.getCommandSize();
+        const commandStart = index * commandSize;
+
+        // 插入到末尾等同于追加，此时无需任何位移
+        if (index === this.length) {
+            this.setCommandArray(commandStart, params.length, command);
+            this.setParamArray(this.paramUsed, normalized);
+            this.indexArray[this.length] = this.paramUsed;
+
+            this.length++;
+            this.paramUsed += length;
+
+            this.expireStreams();
+            return;
+        }
 
         // 先进行位移
-        const commandStart = index * commandSize;
         const paramStart = this.indexArray[index];
         this.commandArray.copyWithin(commandStart + commandSize, commandStart);
         this.paramArray.copyWithin(paramStart + length, paramStart);
@@ -466,6 +488,15 @@ export class ReplayArray implements IReplayArray {
 
     delete(index: number): void {
         if (this.disabled > 0) return;
+        if (index < 0 || index >= this.length) {
+            logger.warn(
+                179,
+                'delete',
+                index.toString(),
+                this.length.toString()
+            );
+            return;
+        }
         const commandSize = this.getCommandSize();
         const commandStart = index * commandSize;
         const range = this.getParamRange(index);
@@ -501,6 +532,10 @@ export class ReplayArray implements IReplayArray {
 
     set(index: number, command: number, params: ReplayParamValue[]): void {
         if (this.disabled > 0) return;
+        if (index < 0 || index >= this.length) {
+            logger.warn(179, 'set', index.toString(), this.length.toString());
+            return;
+        }
         const normalized = this.normalizeParamList(params);
         const length = this.calculateParamsLength(normalized);
         // 末步的参数终点取 paramUsed，与 delete 同口径，避免读到未初始化的 indexArray[index + 1]
@@ -825,6 +860,9 @@ export class ReplayArray implements IReplayArray {
         this.length = length;
 
         this.rebuildIndexArray();
+
+        // 缓冲区被整体替换后，此前创建的读流偏移已失效，需要与其它写路径一样标记过期
+        this.expireStreams();
     }
 
     //#endregion
diff --git a/packages-user/data-common/src/replay/saveLoad.test.ts b/packages-user/data-common/src/replay/saveLoad.test.ts
index e86cee5..3f19acc 100644
--- a/packages-user/data-common/src/replay/saveLoad.test.ts
+++ b/packages-user/data-common/src/replay/saveLoad.test.ts
@@ -1,4 +1,5 @@
-// 测试录像存读档：ReplaySystem 同实例往返与多类型参数读回
+// 测试录像存读档：ReplaySystem 同实例往返、多类型参数读回与活跃读流跨读档过期
+import { logger } from '@motajs/common';
 import { afterAll, describe, expect, it, vi } from 'vitest';
 import { ReplaySystem } from './system';
 
@@ -63,4 +64,24 @@ describe('ReplaySystem save and load round trips', () => {
         expect(system.route.getParamArray()).toBe(snapshot.paramArray);
         expect(system.route.get(0).command).toBe(2);
     });
+
+    // 验证读档整体替换缓冲区后，此前创建的活跃沙箱读流被标记过期并触发告警码 156（#06-17-3）
+    it('expires an active sandbox read stream when a snapshot is loaded', () => {
+        const system = createSystem();
+        system.registerCommand(1, { execute: async () => true });
+        system.record(1, 7);
+
+        const snapshot = system.saveState();
+        system.record(1, 9);
+
+        const sandbox = system.createReplaySandbox({
+            route: system.route,
+            reseter: { reset: () => {} }
+        });
+        system.loadState(snapshot);
+
+        const { info } = logger.catch(() => sandbox.play());
+
+        expect(info.map(v => v.code)).toContain(156);
+    });
 });
diff --git a/packages-user/data-common/src/replay/types.ts b/packages-user/data-common/src/replay/types.ts
index 7aba39e..cd94971 100644
--- a/packages-user/data-common/src/replay/types.ts
+++ b/packages-user/data-common/src/replay/types.ts
@@ -196,8 +196,10 @@ export interface IReplayArray {
 
     /**
      * 在指定索引处插入一条录像步，后续录像会自动后移。
+     * 索引可传当前总步数，此时等同于在末尾追加一条录像步。
+     * 索引越界时不会产生任何修改，并触发告警码 179。
      * 由于此操作会涉及大量的内存迁移，耗时较长，因此不建议频繁调用。
-     * @param index 插入位置
+     * @param index 插入位置，合法区间为 `[0, length]`
      * @param command 指令标识
      * @param params 参数列表
      */
@@ -205,16 +207,18 @@ export interface IReplayArray {
 
     /**
      * 删除指定索引处的录像步，此行为不会产生空槽。
+     * 索引越界时不会产生任何修改，并触发告警码 179。
      * 由于此操作会涉及大量的内存迁移，耗时较长，因此不建议频繁调用。
-     * @param index 要删除的步索引
+     * @param index 要删除的步索引，合法区间为 `[0, length)`
      */
     delete(index: number): void;
 
     /**
      * 修改指定索引处的录像步。新的参数列表允许与原有参数编码长度不同，
      * 此情形下其后所有录像步的参数起始索引会同步平移。
+     * 索引越界时不会产生任何修改，并触发告警码 179。
      * 由于此操作会涉及大量的内存迁移，耗时较长，因此不建议频繁调用。
-     * @param index 要修改的步索引
+     * @param index 要修改的步索引，合法区间为 `[0, length)`
      * @param command 新的指令标识
      * @param params 新的参数列表
      */
diff --git a/packages/common/src/logger.json b/packages/common/src/logger.json
index 73cb4dc..14b8b74 100644
--- a/packages/common/src/logger.json
+++ b/packages/common/src/logger.json
@@ -253,6 +253,7 @@
         "176": "Cannot add move step to replay system since only 'up,right,down,left' directions are acceptable.",
         "177": "Save data for saveable content $1 is needed, but there's no data in save data. Maybe a version issue for it? System will try to load other contents to make game run normally.",
         "178": "Save data with keys of '$1' are saved but not be loaded, is there some issue for it?",
+        "179": "Replay $1 received an out-of-range index $2, the current replay length is $3. The operation will be ignored.",
         "1001": "Event(setBlock): Unknown tile '$1' when setting block."
     }
 }