diff --git a/cmd/bots/aiogramecho/README.md b/cmd/bots/aiogramecho/README.md
index c6d5548d..0febb3a7 100644
--- a/cmd/bots/aiogramecho/README.md
+++ b/cmd/bots/aiogramecho/README.md
@@ -10,6 +10,21 @@ $env:TELESRV_BOT_TOKEN = "<bot_id>:<secret>"
 python .\cmd\bots\aiogramecho\echo.py --drop-pending
 ```
 
+## Ephemeral echo（Bot API 10.2）
+
+先通过 `setMyCommands` 把 `private` 注册为 `is_ephemeral=true`，再在 TDesktop Layer 228
+的群组中发送：
+
+```text
+/private@你的Bot用户名
+```
+
+aiogram 3.30.0 原生解析 `ephemeral_message_id`。示例在 15 秒 action 窗口内携带
+`receiver_user_id` 和 `ReplyParameters(ephemeral_message_id=...)` 回复
+`ephemeral echo: ...`；失败不会降级成普通消息。Alice 应看到两条带
+可见性提示的消息：自己发出的命令显示“Only visible to @Bot”，bot 回复显示
+“Only visible to you”；Bob 不应看到其中任何一条。
+
 发送三种语义色的 reply keyboard 与 inline callback 按钮：
 
 ```powershell
diff --git a/cmd/bots/aiogramecho/echo.py b/cmd/bots/aiogramecho/echo.py
index 42380f74..78b0d172 100644
--- a/cmd/bots/aiogramecho/echo.py
+++ b/cmd/bots/aiogramecho/echo.py
@@ -17,6 +17,7 @@ from aiogram.types import (
     InlineKeyboardMarkup,
     KeyboardButton,
     Message,
+    ReplyParameters,
     ReplyKeyboardMarkup,
 )
 from aiogram.webhook.aiohttp_server import SimpleRequestHandler, setup_application
@@ -45,6 +46,7 @@ def parse_args() -> argparse.Namespace:
         help="API server origin; aiogram adds /bot<TOKEN> and /file/bot<TOKEN>",
     )
     parser.add_argument("--prefix", default="aiogram echo: ")
+    parser.add_argument("--ephemeral-prefix", default="ephemeral echo: ")
     parser.add_argument("--drop-pending", action="store_true")
     parser.add_argument("--mode", choices=("polling", "webhook"), default=os.getenv("TELESRV_BOT_MODE", "polling"))
     parser.add_argument(
@@ -157,6 +159,35 @@ async def send_button_messages(bot: Bot, chat_id: int, icon_id: str | None) -> N
     )
 
 
+def ephemeral_message_id(message: object) -> int | None:
+    """Read the native aiogram field, retaining an extra-field fallback."""
+    raw = getattr(message, "ephemeral_message_id", None)
+    if raw is None:
+        raw = (getattr(message, "model_extra", None) or {}).get("ephemeral_message_id")
+    if isinstance(raw, int) and not isinstance(raw, bool) and raw > 0:
+        return raw
+    return None
+
+
+async def send_echo(message: Message, prefix: str, ephemeral_prefix: str):
+    text = message.text or message.caption or ""
+    if not text:
+        return None
+    transient_id = ephemeral_message_id(message)
+    if transient_id is None:
+        return await message.answer(prefix + text)
+
+    if message.from_user is None:
+        LOG.warning("ignored ephemeral message without from_user ephemeral_message_id=%s", transient_id)
+        return None
+    return await message.bot.send_message(
+        chat_id=message.chat.id,
+        text=ephemeral_prefix + text,
+        receiver_user_id=message.from_user.id,
+        reply_parameters=ReplyParameters(ephemeral_message_id=transient_id),
+    )
+
+
 def build_dispatcher(args: argparse.Namespace) -> Dispatcher:
     router = Router(name="telesrv-aiogramecho")
 
@@ -170,7 +201,17 @@ def build_dispatcher(args: argparse.Namespace) -> Dispatcher:
 
     @router.message(Command("ping"))
     async def ping(message: Message) -> None:
-        await message.answer(args.prefix + (message.text or ""))
+        await send_echo(message, args.prefix, args.ephemeral_prefix)
+
+    @router.message(Command("private"))
+    async def private(message: Message) -> None:
+        sent = await send_echo(message, args.prefix, args.ephemeral_prefix)
+        LOG.info(
+            "echoed ephemeral chat_id=%s ephemeral_message_id=%s sent_ephemeral_message_id=%s",
+            message.chat.id,
+            ephemeral_message_id(message),
+            ephemeral_message_id(sent) if sent is not None else None,
+        )
 
     @router.callback_query(F.data.startswith("aiogram-"))
     async def callback(query: CallbackQuery) -> None:
@@ -185,7 +226,7 @@ def build_dispatcher(args: argparse.Namespace) -> Dispatcher:
 
     @router.message(F.text)
     async def echo(message: Message) -> None:
-        await message.answer(args.prefix + (message.text or ""))
+        await send_echo(message, args.prefix, args.ephemeral_prefix)
         LOG.info("echoed chat_id=%s message_id=%s", message.chat.id, message.message_id)
 
     dispatcher = Dispatcher()
diff --git a/cmd/bots/aiogramecho/test_echo.py b/cmd/bots/aiogramecho/test_echo.py
new file mode 100644
index 00000000..166e471d
--- /dev/null
+++ b/cmd/bots/aiogramecho/test_echo.py
@@ -0,0 +1,63 @@
+import unittest
+from types import SimpleNamespace
+
+import echo
+
+
+class FakeBot:
+    def __init__(self):
+        self.calls = []
+
+    async def send_message(self, **kwargs):
+        self.calls.append(kwargs)
+        return SimpleNamespace(message_id=0, ephemeral_message_id=88)
+
+
+class FakeMessage:
+    def __init__(self, *, text="hello", ephemeral_id=None):
+        self.text = text
+        self.caption = None
+        self.chat = SimpleNamespace(id=-1000000000002)
+        self.from_user = SimpleNamespace(id=1780243200)
+        self.ephemeral_message_id = ephemeral_id
+        self.model_extra = {}
+        self.bot = FakeBot()
+        self.answers = []
+
+    async def answer(self, text):
+        self.answers.append(text)
+        return SimpleNamespace(message_id=1, ephemeral_message_id=None)
+
+
+class EchoTest(unittest.IsolatedAsyncioTestCase):
+    async def test_ephemeral_echo_uses_receiver_and_transient_reply(self):
+        message = FakeMessage(text="/private@TetrisBot", ephemeral_id=77)
+
+        await echo.send_echo(message, "aiogram echo: ", "ephemeral echo: ")
+
+        self.assertEqual(message.answers, [])
+        self.assertEqual(len(message.bot.calls), 1)
+        call = message.bot.calls[0]
+        self.assertEqual(call["chat_id"], -1000000000002)
+        self.assertEqual(call["text"], "ephemeral echo: /private@TetrisBot")
+        self.assertEqual(call["receiver_user_id"], 1780243200)
+        self.assertEqual(call["reply_parameters"].ephemeral_message_id, 77)
+
+    async def test_normal_echo_stays_on_standard_answer_path(self):
+        message = FakeMessage()
+
+        await echo.send_echo(message, "aiogram echo: ", "ephemeral echo: ")
+
+        self.assertEqual(message.answers, ["aiogram echo: hello"])
+        self.assertEqual(message.bot.calls, [])
+
+    def test_extra_field_fallback_and_invalid_values(self):
+        message = FakeMessage()
+        message.model_extra = {"ephemeral_message_id": 66}
+        self.assertEqual(echo.ephemeral_message_id(message), 66)
+        message.model_extra = {"ephemeral_message_id": True}
+        self.assertIsNone(echo.ephemeral_message_id(message))
+
+
+if __name__ == "__main__":
+    unittest.main()
diff --git a/cmd/bots/ptbecho/README.md b/cmd/bots/ptbecho/README.md
index 200018a5..50f64b9f 100644
--- a/cmd/bots/ptbecho/README.md
+++ b/cmd/bots/ptbecho/README.md
@@ -17,6 +17,21 @@ In a group with BotFather privacy enabled, send a command such as:
 /ping hello from group
 ```
 
+## Ephemeral echo（Bot API 10.2）
+
+先通过 `setMyCommands` 把 `private` 注册为 `is_ephemeral=true`，然后保持本示例轮询。
+在 TDesktop Layer 228 的群组里发送：
+
+```text
+/private@你的Bot用户名
+```
+
+本示例从 PTB 的 `Message.api_kwargs` 读取 `ephemeral_message_id`，并在 15 秒 action
+窗口内用 `receiver_user_id` 与 `reply_parameters.ephemeral_message_id` 回复
+`ephemeral echo: ...`。请求失败时不会降级成普通群消息。Alice 应看到两条带
+可见性提示的消息：自己发出的命令显示“Only visible to @Bot”，bot 回复显示
+“Only visible to you”；Bob 不应看到其中任何一条。
+
 主动发送一条消息并退出：
 
 ```powershell
diff --git a/cmd/bots/ptbecho/echo.py b/cmd/bots/ptbecho/echo.py
index f8f917e3..82bf75f8 100644
--- a/cmd/bots/ptbecho/echo.py
+++ b/cmd/bots/ptbecho/echo.py
@@ -16,6 +16,14 @@ to the bot, mentions, or messages otherwise visible to bots. In a group, send:
 
     /ping hello
 
+For a command registered with ``is_ephemeral=true``, send:
+
+    /private@YourBotUsername
+
+The incoming Bot API message has ``message_id=0`` and carries the transient
+identifier in ``api_kwargs`` until python-telegram-bot exposes the Bot API 10.2
+fields directly. The demo replies through the same ephemeral action window.
+
 The same program can also send proactive messages:
 
     python cmd/bots/ptbecho/echo.py \
@@ -70,6 +78,7 @@ def parse_args() -> argparse.Namespace:
     parser.add_argument("--base-url", default=os.getenv("TELESRV_BOT_API_BASE_URL", "http://127.0.0.1:8081/bot"))
     parser.add_argument("--base-file-url", default=os.getenv("TELESRV_BOT_API_BASE_FILE_URL", "http://127.0.0.1:8081/file/bot"))
     parser.add_argument("--prefix", default="echo: ")
+    parser.add_argument("--ephemeral-prefix", default="ephemeral echo: ")
     parser.add_argument("--drop-pending", action="store_true", help="Drop pending updates before polling")
     parser.add_argument("--timeout", type=int, default=30, help="getUpdates long-poll timeout seconds")
     parser.add_argument(
@@ -117,6 +126,38 @@ async def ping(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
     await echo(update, context)
 
 
+def ephemeral_message_id(message: object) -> int | None:
+    """Read a Bot API 10.2 field without depending on a PTB release cycle."""
+    raw = getattr(message, "ephemeral_message_id", None)
+    if raw is None:
+        raw = (getattr(message, "api_kwargs", None) or {}).get("ephemeral_message_id")
+    if isinstance(raw, int) and not isinstance(raw, bool) and raw > 0:
+        return raw
+    return None
+
+
+async def send_echo(message: object, bot: Bot, prefix: str, ephemeral_prefix: str):
+    text = getattr(message, "text", None) or getattr(message, "caption", None) or ""
+    if not text:
+        return None
+    transient_id = ephemeral_message_id(message)
+    if transient_id is None:
+        return await message.reply_text(prefix + text)
+
+    sender = getattr(message, "from_user", None)
+    if sender is None:
+        LOG.warning("ignored ephemeral message without from_user ephemeral_message_id=%s", transient_id)
+        return None
+    return await bot.send_message(
+        chat_id=message.chat_id,
+        text=ephemeral_prefix + text,
+        api_kwargs={
+            "receiver_user_id": sender.id,
+            "reply_parameters": {"ephemeral_message_id": transient_id},
+        },
+    )
+
+
 async def echo(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
     if update.effective_message is None or update.effective_chat is None:
         return
@@ -124,13 +165,20 @@ async def echo(update: Update, context: ContextTypes.DEFAULT_TYPE) -> None:
     if not text:
         return
     prefix = context.application.bot_data.get("prefix", "echo: ")
-    sent = await update.effective_message.reply_text(prefix + text)
+    ephemeral_prefix = context.application.bot_data.get("ephemeral_prefix", "ephemeral echo: ")
+    transient_id = ephemeral_message_id(update.effective_message)
+    sent = await send_echo(update.effective_message, context.bot, prefix, ephemeral_prefix)
+    if sent is None:
+        return
     LOG.info(
-        "echoed update_id=%s chat_id=%s message_id=%s sent_message_id=%s text=%r",
+        "echoed update_id=%s chat_id=%s message_id=%s ephemeral_message_id=%s "
+        "sent_message_id=%s sent_ephemeral_message_id=%s text=%r",
         update.update_id,
         update.effective_chat.id,
         update.effective_message.message_id,
+        transient_id,
         sent.message_id,
+        ephemeral_message_id(sent),
         text,
     )
 
@@ -239,6 +287,7 @@ def build_app(args: argparse.Namespace) -> Application:
         .build()
     )
     app.bot_data["prefix"] = args.prefix
+    app.bot_data["ephemeral_prefix"] = args.ephemeral_prefix
     app.bot_data["base_url"] = args.base_url
     app.bot_data["send_chat_id"] = args.send_chat_id
     app.bot_data["send_text"] = args.send_text
@@ -247,6 +296,7 @@ def build_app(args: argparse.Namespace) -> Application:
     app.bot_data["buttons_chat_id"] = args.buttons_chat_id
     app.add_handler(CommandHandler("start", start))
     app.add_handler(CommandHandler("ping", ping))
+    app.add_handler(CommandHandler("private", echo))
     app.add_handler(CommandHandler("buttons", buttons))
     app.add_handler(CallbackQueryHandler(callback))
     app.add_handler(MessageHandler(filters.TEXT & ~filters.COMMAND, echo))
diff --git a/cmd/bots/ptbecho/test_echo.py b/cmd/bots/ptbecho/test_echo.py
new file mode 100644
index 00000000..3fe4a9a6
--- /dev/null
+++ b/cmd/bots/ptbecho/test_echo.py
@@ -0,0 +1,70 @@
+import unittest
+from types import SimpleNamespace
+
+import echo
+
+
+class FakeMessage:
+    def __init__(self, *, text="hello", ephemeral_id=None):
+        self.text = text
+        self.caption = None
+        self.chat_id = -1000000000002
+        self.from_user = SimpleNamespace(id=1780243200)
+        self.api_kwargs = {}
+        if ephemeral_id is not None:
+            self.api_kwargs["ephemeral_message_id"] = ephemeral_id
+        self.replies = []
+
+    async def reply_text(self, text):
+        self.replies.append(text)
+        return SimpleNamespace(message_id=1, api_kwargs={})
+
+
+class FakeBot:
+    def __init__(self):
+        self.calls = []
+
+    async def send_message(self, **kwargs):
+        self.calls.append(kwargs)
+        return SimpleNamespace(
+            message_id=0,
+            api_kwargs={"ephemeral_message_id": 88},
+        )
+
+
+class EchoTest(unittest.IsolatedAsyncioTestCase):
+    async def test_ephemeral_echo_uses_receiver_and_transient_reply(self):
+        message = FakeMessage(text="/private@TetrisBot", ephemeral_id=77)
+        bot = FakeBot()
+
+        await echo.send_echo(message, bot, "echo: ", "ephemeral echo: ")
+
+        self.assertEqual(message.replies, [])
+        self.assertEqual(
+            bot.calls,
+            [{
+                "chat_id": -1000000000002,
+                "text": "ephemeral echo: /private@TetrisBot",
+                "api_kwargs": {
+                    "receiver_user_id": 1780243200,
+                    "reply_parameters": {"ephemeral_message_id": 77},
+                },
+            }],
+        )
+
+    async def test_normal_echo_stays_on_standard_reply_path(self):
+        message = FakeMessage()
+        bot = FakeBot()
+
+        await echo.send_echo(message, bot, "echo: ", "ephemeral echo: ")
+
+        self.assertEqual(message.replies, ["echo: hello"])
+        self.assertEqual(bot.calls, [])
+
+    def test_invalid_ephemeral_id_is_not_accepted(self):
+        self.assertIsNone(echo.ephemeral_message_id(FakeMessage(ephemeral_id=0)))
+        self.assertIsNone(echo.ephemeral_message_id(FakeMessage(ephemeral_id=True)))
+
+
+if __name__ == "__main__":
+    unittest.main()