diff --git a/docs/event-based-agents/adapters/acceptance-report.md b/docs/event-based-agents/adapters/acceptance-report.md
index 7e5ff8e1..3fad77f5 100644
--- a/docs/event-based-agents/adapters/acceptance-report.md
+++ b/docs/event-based-agents/adapters/acceptance-report.md
@@ -11,6 +11,7 @@ Scope:
 - `lark-eba`
 - `wecom-eba`
 - `wecombot-eba`
+- `wecomcs-eba`
 
 This report follows `acceptance-checklist.md`. Evidence levels are intentionally strict:
 
@@ -32,6 +33,7 @@ This report follows `acceptance-checklist.md`. Evidence levels are intentionally
 | Lark / Feishu | Partial EBA acceptance | EBA adapter structure, self-built/store app config, WebSocket/Webhook mode handling, converters, common APIs, platform APIs, and unit tests are in place. One real LangBot organization WebSocket private text event reached `EBAEventProbe`; outbound component sweep was visible in Feishu. Latest real UI image/file sends did not reach local plugin evidence, so media receive remains blocked. |
 | WeCom | Partial EBA acceptance | Regular WeCom application-message adapter is split into the EBA directory with manifest, converters, API mixin, platform API map, and unit tests. Private text reached `EBAEventProbe` through standalone runtime and the real WeCom client; safe plugin APIs passed. Real inbound media and broader event coverage remain pending. |
 | WeComBot | Partial EBA acceptance | WeCom AI Bot is split into the EBA directory with WebSocket long connection mode and optional webhook mode, EBA message/feedback/platform-specific conversion, cache-backed common APIs, platform API map, unit tests, and a direct live probe. Private text, outbound component sweep, safe common APIs, and all declared WeComBot platform APIs reached `EBAEventProbe`; group, real inbound media, and feedback callback evidence remain pending. |
+| WeCom Customer Service | Partial EBA acceptance | WeCom Customer Service is split into the EBA directory with manifest, converters, API mixin, platform API map, unit tests, docs, and a direct live probe scaffold. Real WeChat customer-side UI text reached `EBAEventProbe`; plugin outbound text/image and safe cache-backed common APIs passed. Inbound media and platform-specific API live coverage remain pending; later fallback text sends were blocked by WeCom `95001 send msg count limit`. |
 
 Telegram and DingTalk now have real user-side UI image/file upload evidence in plugin JSONL. Discord and aiocqhttp do not yet have real UI inbound image/file evidence.
 
@@ -49,6 +51,7 @@ Telegram and DingTalk now have real user-side UI image/file upload evidence in p
 | DingTalk private media | DingTalk Mac, `LangBot Team` org private chat | `data/temp/dingtalk-plugin-e2e-media-ui.jsonl` |
 | Lark / Feishu unit | local mocked Feishu SDK/client paths | `tests/unit_tests/platform/test_lark_eba_adapter.py` |
 | Lark / Feishu partial live | Feishu Mac, LangBot organization `LangBotDev` private chat | `data/temp/lark-plugin-e2e-ws.jsonl` |
+| WeCom Customer Service | WeChat customer-side UI, `客服消息 -> 浪波智能客服` on `dev.rockchin.top` | `/home/wgc/LangBotxg/LangBotEbaTest/data/temp/wecomcs_eba_plugin_probe.jsonl` |
 
 All plugin runs used SDK standalone runtime ports `5400/5401`, LangBot `--standalone-runtime`, and the real plugin at `langbot-plugin-demo/EBAEventProbe`.
 
diff --git a/docs/event-based-agents/adapters/wecomcs.md b/docs/event-based-agents/adapters/wecomcs.md
new file mode 100644
index 00000000..b5549396
--- /dev/null
+++ b/docs/event-based-agents/adapters/wecomcs.md
@@ -0,0 +1,161 @@
+# WeCom Customer Service EBA Adapter
+
+## Status
+
+WeCom Customer Service now has an EBA adapter directory:
+
+```text
+src/langbot/pkg/platform/adapters/wecomcs/
+├── adapter.py
+├── api_impl.py
+├── event_converter.py
+├── manifest.yaml
+├── message_converter.py
+├── platform_api.py
+└── types.py
+```
+
+The adapter is registered as `wecomcs-eba`. It is separate from regular WeCom application messages (`wecom-eba`) and WeCom AI Bot (`wecombot-eba`).
+
+## Configuration
+
+| Field | Required | Default | Description |
+|-------|----------|---------|-------------|
+| `webhook_url` | No | `""` | Unified webhook URL copied into the WeCom Customer Service callback settings. |
+| `corpid` | Yes | `""` | WeCom corporate ID. |
+| `secret` | Yes | `""` | Customer Service secret used for access tokens. |
+| `token` | Yes | `""` | Customer Service callback token. |
+| `EncodingAESKey` | Yes | `""` | Customer Service callback encryption key. |
+| `api_base_url` | No | `https://qyapi.weixin.qq.com/cgi-bin` | WeCom API base URL, overrideable for proxy/private-network deployments. |
+
+## Events
+
+| Event | Status | Notes |
+|-------|--------|-------|
+| `message.received` | Plugin E2E UI covered for text | Text, image, file, and voice payloads convert to common EBA message components in unit tests. Real WeChat customer-side UI text reached `EBAEventProbe` on May 27, 2026. |
+| `platform.specific` | Unit covered | Non-message or unknown Customer Service payloads become structured `PlatformSpecificEvent` records. |
+
+## Common APIs
+
+| API | Status | Notes |
+|-----|--------|-------|
+| `send_message` | Plugin E2E outbound covered | Private/person target only. `target_id` must be `external_userid|open_kfid`. Text and image are implemented; voice/file are explicitly unsupported. |
+| `reply_message` | Plugin E2E partial | Replies through Customer Service `kf/send_msg` using the original `source_platform_object`. The pipeline reply path reached the send API, but the dev account later hit WeCom `95001 send msg count limit`. |
+| `get_message` | Plugin E2E covered from cache | Returns cached inbound `MessageReceivedEvent` by message ID. |
+| `get_user_info` | Plugin E2E covered | Uses cached event users first, then Customer Service `customer/batchget`. |
+| `get_friend_list` | Plugin E2E covered, partial | Returns customer users seen by this adapter instance. |
+| `call_platform_api` | Unit covered | See platform-specific APIs below. |
+| `edit_message` / `delete_message` | Not supported | WeCom Customer Service does not expose a general edit/delete endpoint for bot-sent messages in this adapter. |
+| Group/member/moderation APIs | Not supported | Customer Service conversations handled here are private customer sessions, not group chats. |
+| `upload_file` / `get_file_url` | Not supported | Media upload is used internally for outbound image; no portable file URL common API is exposed. |
+
+## Platform-Specific APIs
+
+| Action | Status | Notes |
+|--------|--------|-------|
+| `check_access_token` | Unit covered | Checks whether the current access token is present. |
+| `refresh_access_token` | Unit covered | Refreshes the Customer Service access token. |
+| `get_customer_info` | Unit covered | Calls Customer Service customer lookup by `external_userid`. |
+
+## Message Components
+
+Receive:
+
+| Component | Status | Notes |
+|-----------|--------|-------|
+| `Source` | Unit covered | Uses Customer Service `msgid` and `send_time`. |
+| `Plain` | Unit covered | Text payload content is preserved. |
+| `Image` | Unit covered | Uses the base64 data URL produced by the existing SDK image download path. |
+| `Voice` | Unit covered | Maps exposed voice media ID to common `Voice.voice_id`; live UI evidence pending. |
+| `File` | Unit covered | Maps exposed file media ID/name/size to common `File`; live UI evidence pending. |
+| `Quote`, `At`, `AtAll`, `Face`, `Forward` | Not supported inbound | The current Customer Service SDK event model does not expose these as structured inbound fields. |
+| `Unknown` | Unit covered | Unsupported message types become `Unknown` in message conversion or `platform.specific` at event level. |
+
+Send:
+
+| Component | Status | Notes |
+|-----------|--------|-------|
+| `Plain` | Plugin E2E outbound covered | Sends through `kf/send_msg` text. |
+| `Image` | Plugin E2E outbound covered | Uploads media as WeCom image media and sends through `kf/send_msg` image. |
+| `Quote`, `At`, `AtAll`, `Forward` | Unit covered fallback, live partially blocked | Flattened to text where possible. In the May 27 sweep, later text sends hit WeCom `95001 send msg count limit` after the successful text/image sends. |
+| `Voice`, `File`, `Face` | Not supported | The adapter raises `NotSupportedError`; no tested Customer Service send path is implemented. |
+
+## Unit Verification
+
+Covered by:
+
+```bash
+PYTHONPATH=/Users/wangqiang/code/python/langbot-plugin-sdk/src uv run pytest tests/unit_tests/platform/test_wecomcs_eba_adapter.py
+```
+
+Result on May 27, 2026: `10 passed`.
+
+The local `PYTHONPATH` is required in this workspace because the installed SDK package in the LangBot venv does not contain the newer `langbot_plugin.api.entities.builtin.platform.errors` module; the existing EBA adapter tests need the same SDK override.
+
+## Live Probe
+
+Auxiliary direct adapter probe:
+
+```bash
+PYTHONPATH=/path/to/langbot-plugin-sdk/src uv run python -m py_compile tests/e2e/live_wecomcs_eba_probe.py
+
+WECOMCS_CORPID=... \
+WECOMCS_SECRET=... \
+WECOMCS_TOKEN=... \
+WECOMCS_ENCODING_AES_KEY=... \
+PYTHONPATH=/path/to/langbot-plugin-sdk/src \
+uv run python tests/e2e/live_wecomcs_eba_probe.py \
+  --path /wecomcs/callback \
+  --log data/temp/wecomcs_eba_live_probe.jsonl
+```
+
+This probe is diagnostic only. Final EBA acceptance still requires the standalone SDK runtime plus `EBAEventProbe` plugin path.
+
+## Standalone Runtime Plugin E2E Record
+
+Completed partial plugin E2E on May 27, 2026 against `dev.rockchin.top` and the WeChat customer-side UI entry `微信 -> 客服消息 -> 浪波智能客服`.
+
+Evidence:
+
+- Server JSONL: `/home/wgc/LangBotxg/LangBotEbaTest/data/temp/wecomcs_eba_plugin_probe.jsonl`
+- Trigger text: `EBA wecomcs dedupe probe 2026-05-27`
+- `bot_uuid`: `cc810d2c-91f3-4f92-8f27-e1bf9f7b6cb4`
+- `adapter_name`: `wecomcs-eba`
+- Observed common event: `MessageReceived`, `event.type=message.received`
+- Observed message chain: `Source + Plain`
+- Observed chat: `chat_type=private`, `chat_id=external_userid|open_kfid`
+- Observed sender: customer `User` with nickname/avatar from Customer Service lookup
+- Plugin API probe: `send_message`, `get_message`, `get_user_info`, `get_friend_list`, plugin/workspace storage, and manifest/list APIs succeeded
+- Component sweep: outbound `Plain` and `Image` succeeded; `Face` and `File` returned explicit `NotSupportedError`; later quote/forward fallback sends were blocked by WeCom `95001 send msg count limit`
+
+Command shape used:
+
+```bash
+cd langbot-plugin-sdk
+uv run python -m langbot_plugin.cli.__init__ rt --debug-only --ws-control-port 5400 --ws-debug-port 5401 --skip-deps-check
+
+cd LangBot
+PYTHONPATH=/absolute/path/to/langbot-plugin-sdk/src uv run main.py --standalone-runtime
+
+cd data/plugins/LangBot__EBAEventProbe
+DEBUG_RUNTIME_WS_URL=ws://127.0.0.1:5401/plugin/ws \
+EBA_PROBE_LOG=/absolute/path/to/LangBot/data/temp/wecomcs_eba_plugin_probe.jsonl \
+EBA_PROBE_API=1 \
+EBA_PROBE_COMPONENT_SWEEP=1 \
+EBA_PROBE_PLATFORM_API=1 \
+uv --project /absolute/path/to/langbot-plugin-sdk run python -m langbot_plugin.cli.__init__ run
+```
+
+Required real UI trigger: send a Customer Service message from the WeCom/WeChat customer-side UI to the configured `dev.rockchin.top` Customer Service account.
+
+## Current Acceptance
+
+Current status is **partial EBA acceptance**.
+
+Blocked or pending items:
+
+- Inbound UI media (`Image`, `Voice`, `File`) was not sent from the real WeChat customer UI during this run, so receive-side media remains unit-covered only.
+- Pipeline auto-reply reached `kf/send_msg`, but the test account hit WeCom `95001 send msg count limit` after successful plugin outbound text/image sends. This is recorded as an account/platform rate-limit block, not a conversion or API-shape failure.
+- The current `EBAEventProbe` run did not call the adapter-specific `call_platform_api` actions (`check_access_token`, `refresh_access_token`, `get_customer_info`); the platform API map remains unit-covered.
+- Inbound voice/file depends on whether the real Customer Service callback plus `sync_msg` endpoint returns those fields in the shape the local SDK models.
+- Group, member, edit, delete, moderation, and standalone file URL APIs are intentionally not declared because this Customer Service protocol path does not provide tested common equivalents.
diff --git a/src/langbot/libs/wecom_customer_service_api/api.py b/src/langbot/libs/wecom_customer_service_api/api.py
index 70270b72..3bc37047 100644
--- a/src/langbot/libs/wecom_customer_service_api/api.py
+++ b/src/langbot/libs/wecom_customer_service_api/api.py
@@ -207,7 +207,33 @@ class WecomCSClient:
                 return await self.send_text_msg(open_kfid, external_userid, msgid, content)
             if data['errcode'] != 0:
                 await self.logger.error(f'发送消息失败：{data}')
-                raise Exception('Failed to send message')
+                raise Exception(f'Failed to send message: {data}')
+            return data
+
+    async def send_image_msg(self, open_kfid: str, external_userid: str, msgid: str, media_id: str):
+        if not await self.check_access_token():
+            self.access_token = await self.get_access_token(self.secret)
+
+        url = f'{self.base_url}/kf/send_msg?access_token={self.access_token}'
+        payload = {
+            'touser': external_userid,
+            'open_kfid': open_kfid,
+            'msgid': msgid,
+            'msgtype': 'image',
+            'image': {
+                'media_id': media_id,
+            },
+        }
+
+        async with httpx.AsyncClient() as client:
+            response = await client.post(url, json=payload)
+            data = response.json()
+            if data['errcode'] == 40014 or data['errcode'] == 42001:
+                self.access_token = await self.get_access_token(self.secret)
+                return await self.send_image_msg(open_kfid, external_userid, msgid, media_id)
+            if data['errcode'] != 0:
+                await self.logger.error(f'发送图片消息失败：{data}')
+                raise Exception('Failed to send image message')
             return data
 
     async def handle_callback_request(self):
@@ -322,7 +348,7 @@ class WecomCSClient:
         if not await self.check_access_token():
             self.access_token = await self.get_access_token(self.secret)
 
-        url = self.base_url + '/media/upload?access_token=' + self.access_token + '&type=file'
+        url = self.base_url + '/media/upload?access_token=' + self.access_token + '&type=image'
         file_bytes = None
         file_name = 'uploaded_file.txt'
 
@@ -368,7 +394,7 @@ class WecomCSClient:
                 self.access_token = await self.get_access_token(self.secret)
                 media_id = await self.upload_to_work(image)
             if data.get('errcode', 0) != 0:
-                raise Exception('failed to upload file')
+                raise Exception(f'failed to upload image: {data}')
 
             media_id = data.get('media_id')
             return media_id
diff --git a/src/langbot/pkg/platform/adapters/wecomcs/__init__.py b/src/langbot/pkg/platform/adapters/wecomcs/__init__.py
new file mode 100644
index 00000000..e1483424
--- /dev/null
+++ b/src/langbot/pkg/platform/adapters/wecomcs/__init__.py
@@ -0,0 +1,5 @@
+"""WeCom Customer Service EBA platform adapter."""
+
+from langbot.pkg.platform.adapters.wecomcs.adapter import WecomCSAdapter
+
+__all__ = ['WecomCSAdapter']
diff --git a/src/langbot/pkg/platform/adapters/wecomcs/adapter.py b/src/langbot/pkg/platform/adapters/wecomcs/adapter.py
new file mode 100644
index 00000000..017482b5
--- /dev/null
+++ b/src/langbot/pkg/platform/adapters/wecomcs/adapter.py
@@ -0,0 +1,227 @@
+from __future__ import annotations
+
+import asyncio
+import time
+import traceback
+import typing
+import uuid
+
+import pydantic
+
+from langbot.libs.wecom_customer_service_api.api import WecomCSClient
+from langbot.libs.wecom_customer_service_api.wecomcsevent import WecomCSEvent
+import langbot_plugin.api.definition.abstract.platform.adapter as abstract_platform_adapter
+import langbot_plugin.api.definition.abstract.platform.event_logger as abstract_platform_logger
+from langbot.pkg.platform.adapters.wecomcs.api_impl import WecomCSAPIMixin
+from langbot.pkg.platform.adapters.wecomcs.event_converter import WecomCSEventConverter
+from langbot.pkg.platform.adapters.wecomcs.message_converter import WecomCSMessageConverter
+from langbot.pkg.platform.adapters.wecomcs.platform_api import PLATFORM_API_MAP
+from langbot.pkg.platform.adapters.wecomcs.types import parse_private_chat_id
+from langbot_plugin.api.entities.builtin.platform import events as platform_events
+from langbot_plugin.api.entities.builtin.platform import message as platform_message
+from langbot_plugin.api.entities.builtin.platform.errors import NotSupportedError
+
+
+class WecomCSAdapter(WecomCSAPIMixin, abstract_platform_adapter.AbstractPlatformAdapter):
+    bot: WecomCSClient = pydantic.Field(exclude=True)
+
+    message_converter: WecomCSMessageConverter = WecomCSMessageConverter()
+    event_converter: WecomCSEventConverter = WecomCSEventConverter()
+
+    config: dict
+    bot_uuid: str | None = None
+    listeners: dict[
+        typing.Type[platform_events.Event],
+        typing.Callable[[platform_events.Event, abstract_platform_adapter.AbstractMessagePlatformAdapter], None],
+    ] = {}
+    _message_cache: dict[str, platform_events.MessageReceivedEvent] = {}
+    _user_cache: dict[str, typing.Any] = {}
+
+    class Config:
+        arbitrary_types_allowed = True
+
+    def __init__(self, config: dict, logger: abstract_platform_logger.AbstractEventLogger):
+        required_keys = [
+            'corpid',
+            'secret',
+            'token',
+            'EncodingAESKey',
+        ]
+        missing_keys = [key for key in required_keys if key not in config]
+        if missing_keys:
+            raise Exception(f'WeComCS missing required config fields: {missing_keys}')
+
+        bot = WecomCSClient(
+            corpid=config['corpid'],
+            secret=config['secret'],
+            token=config['token'],
+            EncodingAESKey=config['EncodingAESKey'],
+            logger=logger,
+            unified_mode=True,
+            api_base_url=config.get('api_base_url', 'https://qyapi.weixin.qq.com/cgi-bin'),
+        )
+
+        super().__init__(
+            config=config,
+            logger=logger,
+            bot=bot,
+            bot_account_id='',
+            bot_uuid=None,
+            listeners={},
+            _message_cache={},
+            _user_cache={},
+        )
+        self._register_native_handlers()
+
+    def set_bot_uuid(self, bot_uuid: str):
+        self.bot_uuid = bot_uuid
+
+    def get_supported_events(self) -> list[str]:
+        return [
+            'message.received',
+            'platform.specific',
+        ]
+
+    def get_supported_apis(self) -> list[str]:
+        return [
+            'send_message',
+            'reply_message',
+            'get_message',
+            'get_user_info',
+            'get_friend_list',
+            'call_platform_api',
+        ]
+
+    async def send_message(
+        self,
+        target_type: str,
+        target_id: str,
+        message: platform_message.MessageChain,
+    ) -> platform_events.MessageResult:
+        if target_type not in ('person', 'private'):
+            raise NotSupportedError(f'send_message:{target_type}')
+
+        external_userid, open_kfid = parse_private_chat_id(target_id)
+        content_list = await WecomCSMessageConverter.yiri2target(message, self.bot)
+        raw_results = []
+        for content in content_list:
+            raw_results.append(await self._send_content(open_kfid, external_userid, self._make_outbound_msgid(), content))
+        return platform_events.MessageResult(raw={'results': raw_results})
+
+    async def reply_message(
+        self,
+        message_source: platform_events.MessageEvent,
+        message: platform_message.MessageChain,
+        quote_origin: bool = False,
+    ) -> platform_events.MessageResult:
+        wecom_event = await WecomCSEventConverter.yiri2target(message_source)
+        if not isinstance(wecom_event, WecomCSEvent):
+            raise ValueError('WeComCS reply_message requires a WecomCSEvent source object')
+        content_list = await WecomCSMessageConverter.yiri2target(message, self.bot)
+        raw_results = []
+        for content in content_list:
+            raw_results.append(
+                await self._send_content(
+                    wecom_event.receiver_id,
+                    wecom_event.user_id,
+                    self._make_outbound_msgid(),
+                    content,
+                )
+            )
+        return platform_events.MessageResult(message_id=wecom_event.message_id, raw={'results': raw_results})
+
+    async def call_platform_api(self, action: str, params: dict = {}) -> dict:
+        handler = PLATFORM_API_MAP.get(action)
+        if handler is None:
+            raise NotSupportedError(f'call_platform_api:{action}')
+        return await handler(self.bot, params)
+
+    def register_listener(
+        self,
+        event_type: typing.Type[platform_events.Event],
+        callback: typing.Callable[
+            [platform_events.Event, abstract_platform_adapter.AbstractMessagePlatformAdapter], None
+        ],
+    ):
+        self.listeners[event_type] = callback
+
+    def unregister_listener(
+        self,
+        event_type: typing.Type[platform_events.Event],
+        callback: typing.Callable[
+            [platform_events.Event, abstract_platform_adapter.AbstractMessagePlatformAdapter], None
+        ],
+    ):
+        registered = self.listeners.get(event_type)
+        if registered is callback:
+            self.listeners.pop(event_type, None)
+
+    async def handle_unified_webhook(self, bot_uuid: str, path: str, request):
+        return await self.bot.handle_unified_webhook(request)
+
+    async def run_async(self):
+        async def keep_alive():
+            while True:
+                await asyncio.sleep(1)
+
+        await self.logger.info('WeComCS EBA adapter running in unified webhook mode')
+        await keep_alive()
+
+    async def kill(self) -> bool:
+        return True
+
+    async def is_muted(self, group_id: int | None = None) -> bool:
+        return False
+
+    def _register_native_handlers(self):
+        async def on_message(event: WecomCSEvent):
+            await self._handle_native_event(event)
+
+        for msg_type in ('text', 'image', 'file', 'voice'):
+            self.bot.on_message(msg_type)(on_message)
+
+    async def _handle_native_event(self, event: WecomCSEvent):
+        self.bot_account_id = event.receiver_id or self.bot_account_id
+        try:
+            if event.message_id and str(event.message_id) in self._message_cache:
+                await self.logger.debug(f'Skip duplicated WeComCS message: {event.message_id}')
+                return
+
+            if platform_events.FriendMessage in self.listeners:
+                legacy_event = await self.event_converter.target2legacy(event, self.bot)
+                if legacy_event:
+                    callback = self.listeners.get(type(legacy_event))
+                    if callback:
+                        await callback(legacy_event, self)
+
+            eba_event = await self.event_converter.target2yiri(event, self.bot)
+            if eba_event:
+                self._cache_event(eba_event)
+                await self._dispatch_eba_event(eba_event)
+        except Exception:
+            await self.logger.error(f'Error in wecomcs native event: {traceback.format_exc()}')
+
+    async def _dispatch_eba_event(self, event: platform_events.EBAEvent):
+        for event_type in (type(event), platform_events.EBAEvent, platform_events.Event):
+            callback = self.listeners.get(event_type)
+            if callback:
+                await callback(event, self)
+                return
+
+    def _cache_event(self, event: platform_events.Event):
+        if not isinstance(event, platform_events.MessageReceivedEvent):
+            return
+        self._message_cache[str(event.message_id)] = event
+        self._user_cache[str(event.sender.id)] = event.sender
+
+    async def _send_content(self, open_kfid: str, external_userid: str, msgid: str, content: dict):
+        content_type = content.get('type')
+        if content_type == 'text':
+            return await self.bot.send_text_msg(open_kfid, external_userid, msgid, content.get('content', ''))
+        if content_type == 'image':
+            return await self.bot.send_image_msg(open_kfid, external_userid, msgid, content['media_id'])
+        raise NotSupportedError(f'send_content:{content_type}')
+
+    @staticmethod
+    def _make_outbound_msgid() -> str:
+        return f'lb-{int(time.time() * 1000)}-{uuid.uuid4().hex[:8]}'
diff --git a/src/langbot/pkg/platform/adapters/wecomcs/api_impl.py b/src/langbot/pkg/platform/adapters/wecomcs/api_impl.py
new file mode 100644
index 00000000..3fca6327
--- /dev/null
+++ b/src/langbot/pkg/platform/adapters/wecomcs/api_impl.py
@@ -0,0 +1,82 @@
+from __future__ import annotations
+
+import typing
+
+from langbot.libs.wecom_customer_service_api.api import WecomCSClient
+from langbot_plugin.api.entities.builtin.platform import entities as platform_entities
+from langbot_plugin.api.entities.builtin.platform import events as platform_events
+from langbot_plugin.api.entities.builtin.platform import message as platform_message
+from langbot_plugin.api.entities.builtin.platform.errors import NotSupportedError
+
+
+class WecomCSAPIMixin:
+    bot: WecomCSClient
+    _message_cache: dict[str, platform_events.MessageReceivedEvent]
+    _user_cache: dict[str, platform_entities.User]
+
+    async def get_message(
+        self,
+        chat_type: str,
+        chat_id: typing.Union[int, str],
+        message_id: typing.Union[int, str],
+    ) -> platform_events.MessageReceivedEvent:
+        event = self._message_cache.get(str(message_id))
+        if event is None:
+            raise NotSupportedError('get_message:message_not_cached')
+        return event
+
+    async def get_user_info(self, user_id: typing.Union[int, str]) -> platform_entities.User:
+        cached = self._user_cache.get(str(user_id))
+        if cached is not None:
+            return cached
+        info = await self.bot.get_customer_info(str(user_id))
+        if not info:
+            raise NotSupportedError('get_user_info:not_found')
+        return platform_entities.User(
+            id=info.get('external_userid') or user_id,
+            nickname=info.get('nickname') or str(user_id),
+            avatar_url=info.get('avatar'),
+            username=info.get('external_userid') or None,
+        )
+
+    async def get_friend_list(self) -> list[platform_entities.User]:
+        return list(self._user_cache.values())
+
+    async def upload_file(self, file_data: bytes, filename: str) -> str:
+        raise NotSupportedError('upload_file')
+
+    async def get_file_url(self, file_id: str) -> str:
+        raise NotSupportedError('get_file_url')
+
+    async def get_group_info(self, group_id: typing.Union[int, str]) -> platform_entities.UserGroup:
+        raise NotSupportedError('get_group_info')
+
+    async def get_group_member_list(
+        self,
+        group_id: typing.Union[int, str],
+    ) -> list[platform_entities.UserGroupMember]:
+        raise NotSupportedError('get_group_member_list')
+
+    async def get_group_member_info(
+        self,
+        group_id: typing.Union[int, str],
+        user_id: typing.Union[int, str],
+    ) -> platform_entities.UserGroupMember:
+        raise NotSupportedError('get_group_member_info')
+
+    async def edit_message(
+        self,
+        chat_type: str,
+        chat_id: typing.Union[int, str],
+        message_id: typing.Union[int, str],
+        new_content: platform_message.MessageChain,
+    ) -> None:
+        raise NotSupportedError('edit_message')
+
+    async def delete_message(
+        self,
+        chat_type: str,
+        chat_id: typing.Union[int, str],
+        message_id: typing.Union[int, str],
+    ) -> None:
+        raise NotSupportedError('delete_message')
diff --git a/src/langbot/pkg/platform/adapters/wecomcs/event_converter.py b/src/langbot/pkg/platform/adapters/wecomcs/event_converter.py
new file mode 100644
index 00000000..7c074365
--- /dev/null
+++ b/src/langbot/pkg/platform/adapters/wecomcs/event_converter.py
@@ -0,0 +1,78 @@
+from __future__ import annotations
+
+import typing
+
+from langbot.libs.wecom_customer_service_api.api import WecomCSClient
+from langbot.libs.wecom_customer_service_api.wecomcsevent import WecomCSEvent
+import langbot_plugin.api.definition.abstract.platform.adapter as abstract_platform_adapter
+from langbot.pkg.platform.adapters.wecomcs.message_converter import WecomCSMessageConverter
+from langbot.pkg.platform.adapters.wecomcs.types import ADAPTER_NAME, make_private_chat_id
+from langbot_plugin.api.entities.builtin.platform import entities as platform_entities
+from langbot_plugin.api.entities.builtin.platform import events as platform_events
+
+
+class WecomCSEventConverter(abstract_platform_adapter.AbstractEventConverter):
+    @staticmethod
+    async def yiri2target(event: platform_events.Event) -> WecomCSEvent | None:
+        return getattr(event, 'source_platform_object', None)
+
+    @staticmethod
+    async def target2legacy(event: WecomCSEvent, bot: WecomCSClient | None = None) -> platform_events.FriendMessage | None:
+        eba_event = await WecomCSEventConverter.target2yiri(event, bot)
+        if hasattr(eba_event, 'to_legacy_event'):
+            return eba_event.to_legacy_event()
+        return None
+
+    @staticmethod
+    async def target2yiri(event: WecomCSEvent, bot: WecomCSClient | None = None) -> platform_events.Event | None:
+        if event.type in {'text', 'image', 'file', 'voice'}:
+            return await WecomCSEventConverter.message_to_eba(event, bot)
+        return WecomCSEventConverter.platform_specific(event, f'wecomcs.{event.type or "unknown"}')
+
+    @staticmethod
+    async def message_to_eba(event: WecomCSEvent, bot: WecomCSClient | None = None) -> platform_events.MessageReceivedEvent:
+        message_chain = await WecomCSMessageConverter.target2yiri(event)
+        sender = await WecomCSEventConverter.user_from_event(event, bot)
+        return platform_events.MessageReceivedEvent(
+            type='message.received',
+            adapter_name=ADAPTER_NAME,
+            message_id=event.message_id or '',
+            message_chain=message_chain,
+            sender=sender,
+            chat_type=platform_entities.ChatType.PRIVATE,
+            chat_id=make_private_chat_id(event.user_id, event.receiver_id),
+            group=None,
+            timestamp=float(event.timestamp or 0),
+            source_platform_object=event,
+        )
+
+    @staticmethod
+    async def user_from_event(event: WecomCSEvent, bot: WecomCSClient | None = None) -> platform_entities.User:
+        nickname = str(event.user_id or '')
+        avatar_url = None
+        raw: dict[str, typing.Any] = {}
+        if bot and event.user_id:
+            try:
+                raw = await bot.get_customer_info(event.user_id) or {}
+                nickname = raw.get('nickname') or nickname
+                avatar_url = raw.get('avatar')
+            except Exception:
+                raw = {}
+
+        return platform_entities.User(
+            id=event.user_id or '',
+            nickname=nickname,
+            avatar_url=avatar_url,
+            username=raw.get('external_userid') or None,
+        )
+
+    @staticmethod
+    def platform_specific(event: WecomCSEvent, action: str) -> platform_events.PlatformSpecificEvent:
+        return platform_events.PlatformSpecificEvent(
+            type='platform.specific',
+            adapter_name=ADAPTER_NAME,
+            action=action,
+            data=dict(event),
+            timestamp=float(event.timestamp or 0),
+            source_platform_object=event,
+        )
diff --git a/src/langbot/pkg/platform/adapters/wecomcs/manifest.yaml b/src/langbot/pkg/platform/adapters/wecomcs/manifest.yaml
new file mode 100644
index 00000000..b891b1d0
--- /dev/null
+++ b/src/langbot/pkg/platform/adapters/wecomcs/manifest.yaml
@@ -0,0 +1,106 @@
+apiVersion: v1
+kind: MessagePlatformAdapter
+
+metadata:
+  name: wecomcs-eba
+  label:
+    en_US: WeCom Customer Service (EBA)
+    zh_Hans: 企业微信客服 (EBA)
+    zh_Hant: 企業微信客服 (EBA)
+  description:
+    en_US: WeCom Customer Service adapter with Event-Based Agents support
+    zh_Hans: 企业微信客服适配器（EBA 架构版本），通过统一 Webhook 接收客服会话消息
+    zh_Hant: 企業微信客服適配器（EBA 架構版本），透過統一 Webhook 接收客服會話訊息
+  icon: wecom.png
+
+spec:
+  categories:
+    - china
+  help_links:
+    zh: https://link.langbot.app/zh/platforms/wecomcs
+    en: https://link.langbot.app/en/platforms/wecomcs
+    ja: https://link.langbot.app/ja/platforms/wecomcs
+  config:
+    - name: webhook_url
+      label:
+        en_US: Webhook Callback URL
+        zh_Hans: Webhook 回调地址
+        zh_Hant: Webhook 回調地址
+      description:
+        en_US: Copy this URL and paste it into your WeCom Customer Service webhook configuration.
+        zh_Hans: 复制此地址并粘贴到企业微信客服的 Webhook 配置中。
+        zh_Hant: 複製此地址並貼到企業微信客服的 Webhook 設定中。
+      type: webhook-url
+      required: false
+      default: ""
+    - name: corpid
+      label:
+        en_US: Corpid
+        zh_Hans: 企业ID
+        zh_Hant: 企業ID
+      type: string
+      required: true
+      default: ""
+    - name: secret
+      label:
+        en_US: Secret
+        zh_Hans: 密钥 (Secret)
+        zh_Hant: 密鑰 (Secret)
+      type: string
+      required: true
+      default: ""
+    - name: token
+      label:
+        en_US: Token
+        zh_Hans: 令牌 (Token)
+        zh_Hant: 令牌 (Token)
+      type: string
+      required: true
+      default: ""
+    - name: EncodingAESKey
+      label:
+        en_US: EncodingAESKey
+        zh_Hans: 消息加解密密钥 (EncodingAESKey)
+        zh_Hant: 訊息加解密密鑰 (EncodingAESKey)
+      type: string
+      required: true
+      default: ""
+    - name: api_base_url
+      label:
+        en_US: API Base URL
+        zh_Hans: API 基础 URL
+        zh_Hant: API 基礎 URL
+      description:
+        en_US: Optional WeCom API base URL for private network or reverse proxy deployments.
+        zh_Hans: 可选，若部署在内网环境并通过反向代理访问企业微信 API，可根据文档填写此项
+        zh_Hant: 可選，若部署在內網環境並透過反向代理存取企業微信 API，可根據文件填寫此項
+      type: string
+      required: false
+      default: "https://qyapi.weixin.qq.com/cgi-bin"
+
+  supported_events:
+    - message.received
+    - platform.specific
+
+  supported_apis:
+    required:
+      - send_message
+      - reply_message
+    optional:
+      - get_message
+      - get_user_info
+      - get_friend_list
+      - call_platform_api
+
+  platform_specific_apis:
+    - action: check_access_token
+      description: { en_US: "Check whether the current WeCom Customer Service access token is usable", zh_Hans: "检查当前企业微信客服 access token 是否可用" }
+    - action: refresh_access_token
+      description: { en_US: "Refresh the WeCom Customer Service access token", zh_Hans: "刷新企业微信客服 access token" }
+    - action: get_customer_info
+      description: { en_US: "Get WeCom Customer Service customer information by external user ID", zh_Hans: "按 external_userid 获取企业微信客服客户信息" }
+
+execution:
+  python:
+    path: ./adapter.py
+    attr: WecomCSAdapter
diff --git a/src/langbot/pkg/platform/adapters/wecomcs/message_converter.py b/src/langbot/pkg/platform/adapters/wecomcs/message_converter.py
new file mode 100644
index 00000000..4d4ac749
--- /dev/null
+++ b/src/langbot/pkg/platform/adapters/wecomcs/message_converter.py
@@ -0,0 +1,91 @@
+from __future__ import annotations
+
+import datetime
+
+from langbot.libs.wecom_customer_service_api.api import WecomCSClient
+import langbot_plugin.api.definition.abstract.platform.adapter as abstract_platform_adapter
+from langbot_plugin.api.entities.builtin.platform import message as platform_message
+from langbot_plugin.api.entities.builtin.platform.errors import NotSupportedError
+
+
+def split_string_by_bytes(text: str, limit: int = 2048, encoding: str = 'utf-8') -> list[str]:
+    """Split text without cutting a multi-byte character in half."""
+    bytes_data = text.encode(encoding)
+    total_len = len(bytes_data)
+    parts: list[str] = []
+    start = 0
+
+    while start < total_len:
+        end = min(start + limit, total_len)
+        chunk = bytes_data[start:end]
+        part = chunk.decode(encoding, errors='ignore')
+        part_len = len(part.encode(encoding))
+        if part_len == 0 and end < total_len:
+            start += 1
+            continue
+        parts.append(part)
+        start += part_len
+
+    return parts
+
+
+class WecomCSMessageConverter(abstract_platform_adapter.AbstractMessageConverter):
+    @staticmethod
+    async def yiri2target(message_chain: platform_message.MessageChain, bot: WecomCSClient) -> list[dict]:
+        content_list: list[dict] = []
+
+        for msg in message_chain:
+            if isinstance(msg, platform_message.Source):
+                continue
+            if isinstance(msg, platform_message.Plain):
+                content_list.extend({'type': 'text', 'content': chunk} for chunk in split_string_by_bytes(msg.text))
+            elif isinstance(msg, platform_message.Image):
+                content_list.append({'type': 'image', 'media_id': await bot.get_media_id(msg)})
+            elif isinstance(msg, platform_message.Forward):
+                for node in msg.node_list:
+                    content_list.extend(await WecomCSMessageConverter.yiri2target(node.message_chain, bot))
+            elif isinstance(msg, platform_message.Quote):
+                if msg.id is not None:
+                    content_list.append({'type': 'text', 'content': f'[Quote {msg.id}] '})
+                if msg.origin:
+                    content_list.extend(await WecomCSMessageConverter.yiri2target(msg.origin, bot))
+            elif isinstance(msg, platform_message.At):
+                content_list.append({'type': 'text', 'content': f'@{msg.display or msg.target}'})
+            elif isinstance(msg, platform_message.AtAll):
+                content_list.append({'type': 'text', 'content': '@all'})
+            elif isinstance(msg, (platform_message.Voice, platform_message.File, platform_message.Face)):
+                raise NotSupportedError(f'wecomcs_send_component:{msg.type}')
+            else:
+                content_list.append({'type': 'text', 'content': str(msg)})
+
+        return content_list
+
+    @staticmethod
+    async def target2yiri(event: dict) -> platform_message.MessageChain:
+        message_id = event.get('msgid') or ''
+        timestamp = event.get('send_time') or event.get('sendtime') or datetime.datetime.now().timestamp()
+        components: list[platform_message.MessageComponent] = [
+            platform_message.Source(id=message_id, time=datetime.datetime.fromtimestamp(float(timestamp))),
+        ]
+
+        msgtype = event.get('msgtype')
+        if msgtype == 'text':
+            components.append(platform_message.Plain(text=(event.get('text') or {}).get('content', '')))
+        elif msgtype == 'image':
+            components.append(platform_message.Image(base64=event.get('picurl') or ''))
+        elif msgtype == 'file':
+            file_data = event.get('file') or {}
+            components.append(
+                platform_message.File(
+                    id=file_data.get('media_id'),
+                    name=file_data.get('filename') or file_data.get('file_name') or '',
+                    size=file_data.get('file_size') or 0,
+                )
+            )
+        elif msgtype == 'voice':
+            voice_data = event.get('voice') or {}
+            components.append(platform_message.Voice(voice_id=voice_data.get('media_id') or ''))
+        else:
+            components.append(platform_message.Unknown(text=f'[unsupported wecomcs msgtype: {msgtype or "unknown"}]'))
+
+        return platform_message.MessageChain(components)
diff --git a/src/langbot/pkg/platform/adapters/wecomcs/platform_api.py b/src/langbot/pkg/platform/adapters/wecomcs/platform_api.py
new file mode 100644
index 00000000..3f6bd2ba
--- /dev/null
+++ b/src/langbot/pkg/platform/adapters/wecomcs/platform_api.py
@@ -0,0 +1,29 @@
+from __future__ import annotations
+
+import typing
+
+from langbot.libs.wecom_customer_service_api.api import WecomCSClient
+
+
+async def check_access_token(bot: WecomCSClient, params: dict) -> dict:
+    return {'valid': await bot.check_access_token()}
+
+
+async def refresh_access_token(bot: WecomCSClient, params: dict) -> dict:
+    bot.access_token = await bot.get_access_token(bot.secret)
+    return {'ok': bool(bot.access_token)}
+
+
+async def get_customer_info(bot: WecomCSClient, params: dict) -> dict:
+    user_id = params.get('external_userid') or params.get('user_id') or params.get('userid')
+    if not user_id:
+        raise ValueError('external_userid is required')
+    info = await bot.get_customer_info(str(user_id))
+    return info or {}
+
+
+PLATFORM_API_MAP: dict[str, typing.Callable[[WecomCSClient, dict], typing.Awaitable[dict]]] = {
+    'check_access_token': check_access_token,
+    'refresh_access_token': refresh_access_token,
+    'get_customer_info': get_customer_info,
+}
diff --git a/src/langbot/pkg/platform/adapters/wecomcs/types.py b/src/langbot/pkg/platform/adapters/wecomcs/types.py
new file mode 100644
index 00000000..ce8c7e45
--- /dev/null
+++ b/src/langbot/pkg/platform/adapters/wecomcs/types.py
@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+ADAPTER_NAME = 'wecomcs-eba'
+
+
+def make_private_chat_id(user_id: str | int | None, open_kfid: str | int | None) -> str:
+    """Build the routable private chat id used by the WeCom CS EBA adapter."""
+    user = str(user_id or '')
+    kfid = str(open_kfid or '')
+    if not user or not kfid:
+        return user
+    return f'{user}|{kfid}'
+
+
+def parse_private_chat_id(chat_id: str | int) -> tuple[str, str]:
+    user_id, sep, open_kfid = str(chat_id).partition('|')
+    if not user_id or not sep or not open_kfid:
+        raise ValueError('WeComCS target_id must be formatted as "external_userid|open_kfid"')
+    return user_id, open_kfid
diff --git a/src/langbot/pkg/platform/adapters/wecomcs/wecom.png b/src/langbot/pkg/platform/adapters/wecomcs/wecom.png
new file mode 100644
index 00000000..8588c20d
Binary files /dev/null and b/src/langbot/pkg/platform/adapters/wecomcs/wecom.png differ
diff --git a/tests/e2e/live_wecomcs_eba_probe.py b/tests/e2e/live_wecomcs_eba_probe.py
new file mode 100644
index 00000000..5a4b6f67
--- /dev/null
+++ b/tests/e2e/live_wecomcs_eba_probe.py
@@ -0,0 +1,211 @@
+from __future__ import annotations
+
+import argparse
+import asyncio
+import json
+import os
+from pathlib import Path
+from typing import Any
+
+from quart import Quart, request
+
+from langbot.pkg.platform.adapters.wecomcs.adapter import WecomCSAdapter
+from langbot_plugin.api.definition.abstract.platform.event_logger import AbstractEventLogger
+from langbot_plugin.api.entities.builtin.platform import events as platform_events
+from langbot_plugin.api.entities.builtin.platform import message as platform_message
+
+
+TINY_PNG = (
+    'data:image/png;base64,'
+    'iVBORw0KGgoAAAANSUhEUgAAAAEAAAABCAQAAAC1HAwCAAAAC0lEQVR42mP8/x8AAwMCAO+/p9sAAAAASUVORK5CYII='
+)
+
+
+class ProbeLogger(AbstractEventLogger):
+    async def info(self, text, images=None, message_session_id=None, no_throw=True):
+        print(f'[info] {text}')
+
+    async def debug(self, text, images=None, message_session_id=None, no_throw=True):
+        print(f'[debug] {text}')
+
+    async def warning(self, text, images=None, message_session_id=None, no_throw=True):
+        print(f'[warning] {text}')
+
+    async def error(self, text, images=None, message_session_id=None, no_throw=True):
+        print(f'[error] {text}')
+
+
+def redact(value: Any) -> Any:
+    if isinstance(value, dict):
+        redacted = {}
+        for key, item in value.items():
+            if key.lower() in {'secret', 'token', 'encodingaeskey', 'access_token'}:
+                redacted[key] = '<redacted>'
+            else:
+                redacted[key] = redact(item)
+        return redacted
+    if isinstance(value, list):
+        return [redact(item) for item in value]
+    return value
+
+
+def summarize_event(event: platform_events.EBAEvent) -> dict:
+    data = {
+        'type': event.type,
+        'adapter_name': event.adapter_name,
+        'timestamp': event.timestamp,
+    }
+    for field in ('message_id', 'chat_id', 'chat_type', 'action', 'data'):
+        if hasattr(event, field):
+            value = getattr(event, field)
+            if hasattr(value, 'value'):
+                value = value.value
+            data[field] = redact(value)
+    if hasattr(event, 'sender') and event.sender is not None:
+        data['sender'] = event.sender.model_dump()
+    if hasattr(event, 'message_chain') and event.message_chain is not None:
+        data['message_chain'] = event.message_chain.model_dump()
+    return data
+
+
+def record_api(results: list[dict[str, Any]], name: str, ok: bool, result: Any = None, error: Exception | None = None):
+    entry = {'name': name, 'ok': ok}
+    if result is not None:
+        entry['result'] = redact(result)
+    if error is not None:
+        entry['error'] = repr(error)
+    results.append(entry)
+    print('WECOMCS_EBA_API', json.dumps(entry, ensure_ascii=False, default=str))
+
+
+async def run_api(results: list[dict[str, Any]], name: str, func):
+    try:
+        result = await func()
+        record_api(results, name, True, result)
+        return result
+    except Exception as exc:
+        record_api(results, name, False, error=exc)
+        return None
+
+
+def config_from_env() -> dict:
+    required = {
+        'corpid': os.getenv('WECOMCS_CORPID') or os.getenv('WECOM_CORPID', ''),
+        'secret': os.getenv('WECOMCS_SECRET') or os.getenv('WECOMCS_KF_SECRET', ''),
+        'token': os.getenv('WECOMCS_TOKEN', ''),
+        'EncodingAESKey': os.getenv('WECOMCS_ENCODING_AES_KEY', ''),
+    }
+    missing = [key for key, value in required.items() if not value]
+    if missing:
+        raise RuntimeError(f'Missing required WeComCS env vars for fields: {missing}')
+    return {
+        **required,
+        'api_base_url': os.getenv('WECOMCS_API_BASE_URL', 'https://qyapi.weixin.qq.com/cgi-bin'),
+    }
+
+
+async def run_probe(args: argparse.Namespace):
+    adapter = WecomCSAdapter(config_from_env(), ProbeLogger())
+    events: list[platform_events.EBAEvent] = []
+    api_results: list[dict[str, Any]] = []
+    first_message = asyncio.Event()
+    log_path = Path(args.log)
+    log_path.parent.mkdir(parents=True, exist_ok=True)
+
+    async def listener(event, adapter):
+        events.append(event)
+        with log_path.open('a', encoding='utf-8') as fp:
+            fp.write(json.dumps(summarize_event(event), ensure_ascii=False, default=str) + '\n')
+        print('WECOMCS_EBA_EVENT', json.dumps(summarize_event(event), ensure_ascii=False, default=str))
+        if isinstance(event, platform_events.MessageReceivedEvent):
+            first_message.set()
+
+    adapter.register_listener(platform_events.EBAEvent, listener)
+
+    app = Quart(__name__)
+
+    @app.route(args.path, methods=['GET', 'POST'])
+    async def callback():
+        return await adapter.handle_unified_webhook(args.bot_uuid, '', request)
+
+    server_task = asyncio.create_task(app.run_task(host=args.host, port=args.port))
+    try:
+        print(f'READY: configure WeCom Customer Service callback URL to http://{args.host}:{args.port}{args.path}')
+        print('READY: send a real customer-service message from WeCom/WeChat UI to the bot now.')
+        await asyncio.wait_for(first_message.wait(), timeout=args.timeout)
+
+        source = next(event for event in events if isinstance(event, platform_events.MessageReceivedEvent))
+
+        if not args.skip_api:
+            await run_api(
+                api_results,
+                'reply_message:text',
+                lambda: adapter.reply_message(
+                    source,
+                    platform_message.MessageChain([platform_message.Plain(text='WeComCS EBA probe reply')]),
+                ),
+            )
+            await run_api(
+                api_results,
+                'send_message:text',
+                lambda: adapter.send_message(
+                    'person',
+                    source.chat_id,
+                    platform_message.MessageChain([platform_message.Plain(text='WeComCS EBA probe send')]),
+                ),
+            )
+            await run_api(
+                api_results,
+                'send_message:image',
+                lambda: adapter.send_message(
+                    'person',
+                    source.chat_id,
+                    platform_message.MessageChain(
+                        [
+                            platform_message.Plain(text='WeComCS EBA probe image'),
+                            platform_message.Image(base64=TINY_PNG),
+                        ]
+                    ),
+                ),
+            )
+            await run_api(api_results, 'get_message', lambda: adapter.get_message('private', source.chat_id, source.message_id))
+            await run_api(api_results, 'get_user_info', lambda: adapter.get_user_info(source.sender.id))
+            await run_api(api_results, 'get_friend_list', lambda: adapter.get_friend_list())
+            await run_api(
+                api_results,
+                'call_platform_api:check_access_token',
+                lambda: adapter.call_platform_api('check_access_token', {}),
+            )
+            await run_api(
+                api_results,
+                'call_platform_api:get_customer_info',
+                lambda: adapter.call_platform_api('get_customer_info', {'external_userid': source.sender.id}),
+            )
+
+        summary = {
+            'events': [event.type for event in events],
+            'api_results': api_results,
+            'log_path': str(log_path),
+        }
+        print('WECOMCS_EBA_SUMMARY', json.dumps(summary, ensure_ascii=False, default=str))
+        return summary
+    finally:
+        server_task.cancel()
+        await adapter.kill()
+
+
+def main():
+    parser = argparse.ArgumentParser(description='Live WeCom Customer Service EBA adapter probe.')
+    parser.add_argument('--host', default='0.0.0.0')
+    parser.add_argument('--port', type=int, default=5313)
+    parser.add_argument('--path', default='/wecomcs/callback')
+    parser.add_argument('--timeout', type=int, default=180)
+    parser.add_argument('--bot-uuid', default='wecomcs-eba-live-probe')
+    parser.add_argument('--log', default='data/temp/wecomcs_eba_live_probe.jsonl')
+    parser.add_argument('--skip-api', action='store_true')
+    args = parser.parse_args()
+    asyncio.run(run_probe(args))
+
+
+if __name__ == '__main__':
+    main()
diff --git a/tests/unit_tests/platform/test_wecomcs_eba_adapter.py b/tests/unit_tests/platform/test_wecomcs_eba_adapter.py
new file mode 100644
index 00000000..3d147b5d
--- /dev/null
+++ b/tests/unit_tests/platform/test_wecomcs_eba_adapter.py
@@ -0,0 +1,260 @@
+from __future__ import annotations
+
+import pathlib
+from unittest.mock import AsyncMock, patch
+
+import pytest
+import yaml
+
+from langbot.libs.wecom_customer_service_api.api import WecomCSClient
+from langbot.libs.wecom_customer_service_api.wecomcsevent import WecomCSEvent
+from langbot.pkg.platform.adapters.wecomcs.adapter import WecomCSAdapter
+from langbot.pkg.platform.adapters.wecomcs.event_converter import WecomCSEventConverter
+from langbot.pkg.platform.adapters.wecomcs.message_converter import WecomCSMessageConverter, split_string_by_bytes
+from langbot.pkg.platform.adapters.wecomcs.platform_api import PLATFORM_API_MAP
+from langbot_plugin.api.definition.abstract.platform.event_logger import AbstractEventLogger
+from langbot_plugin.api.entities.builtin.platform import entities as platform_entities
+from langbot_plugin.api.entities.builtin.platform import events as platform_events
+from langbot_plugin.api.entities.builtin.platform import message as platform_message
+from langbot_plugin.api.entities.builtin.platform.errors import NotSupportedError
+
+
+class DummyLogger(AbstractEventLogger):
+    async def info(self, text, images=None, message_session_id=None, no_throw=True):
+        pass
+
+    async def debug(self, text, images=None, message_session_id=None, no_throw=True):
+        pass
+
+    async def warning(self, text, images=None, message_session_id=None, no_throw=True):
+        pass
+
+    async def error(self, text, images=None, message_session_id=None, no_throw=True):
+        pass
+
+
+class DummyWecomCSClient(WecomCSClient):
+    def __init__(self, *args, **kwargs):
+        self.corpid = kwargs['corpid']
+        self.secret = kwargs['secret']
+        self.token = kwargs['token']
+        self.aes = kwargs['EncodingAESKey']
+        self.base_url = kwargs.get('api_base_url', 'https://qyapi.weixin.qq.com/cgi-bin')
+        self.logger = kwargs.get('logger')
+        self.access_token = ''
+        self._message_handlers = {}
+        self.get_media_id = AsyncMock(return_value='media-id')
+        self.send_text_msg = AsyncMock(return_value={'msgid': 'sent-text'})
+        self.send_image_msg = AsyncMock(return_value={'msgid': 'sent-image'})
+        self.get_customer_info = AsyncMock(
+            return_value={'external_userid': 'external-1', 'nickname': 'Alice', 'avatar': 'https://example.test/a.png'}
+        )
+        self.check_access_token = AsyncMock(return_value=True)
+        self.get_access_token = AsyncMock(return_value='access-token')
+        self.handle_unified_webhook = AsyncMock(return_value='success')
+
+    def on_message(self, msg_type: str):
+        def decorator(func):
+            self._message_handlers.setdefault(msg_type, []).append(func)
+            return func
+
+        return decorator
+
+
+def manifest() -> dict:
+    manifest_path = (
+        pathlib.Path(__file__).parents[3]
+        / 'src'
+        / 'langbot'
+        / 'pkg'
+        / 'platform'
+        / 'adapters'
+        / 'wecomcs'
+        / 'manifest.yaml'
+    )
+    return yaml.safe_load(manifest_path.read_text())
+
+
+def make_adapter() -> WecomCSAdapter:
+    config = {
+        'corpid': 'corp-id',
+        'secret': 'secret',
+        'token': 'token',
+        'EncodingAESKey': 'encoding-key',
+        'api_base_url': 'https://qyapi.weixin.qq.com/cgi-bin',
+    }
+    with patch('langbot.pkg.platform.adapters.wecomcs.adapter.WecomCSClient', DummyWecomCSClient):
+        return WecomCSAdapter(config, DummyLogger())
+
+
+def wecomcs_event(**overrides) -> WecomCSEvent:
+    msgtype = overrides.get('msgtype', 'text')
+    payload = {
+        'msgtype': msgtype,
+        'msgid': overrides.get('message_id', 'msg-1'),
+        'external_userid': overrides.get('external_userid', 'external-1'),
+        'open_kfid': overrides.get('open_kfid', 'kf-1'),
+        'send_time': overrides.get('send_time', 1_714_000_000),
+    }
+    if msgtype == 'text':
+        payload['text'] = {'content': overrides.get('content', 'hello')}
+    if msgtype == 'image':
+        payload['image'] = {'media_id': overrides.get('media_id', 'media-id')}
+        payload['picurl'] = overrides.get('picurl', 'data:image/png;base64,AAAA')
+    if msgtype == 'file':
+        payload['file'] = {'media_id': 'file-id', 'filename': 'a.txt', 'file_size': 12}
+    if msgtype == 'voice':
+        payload['voice'] = {'media_id': 'voice-id'}
+    return WecomCSEvent.from_payload(payload)
+
+
+def test_wecomcs_supported_events_match_manifest():
+    assert make_adapter().get_supported_events() == manifest()['spec']['supported_events']
+
+
+def test_wecomcs_supported_apis_match_manifest():
+    supported_apis = make_adapter().get_supported_apis()
+    manifest_apis = manifest()['spec']['supported_apis']
+
+    assert supported_apis == manifest_apis['required'] + manifest_apis['optional']
+
+
+def test_wecomcs_platform_api_map_matches_manifest():
+    manifest_actions = {item['action'] for item in manifest()['spec']['platform_specific_apis']}
+
+    assert set(PLATFORM_API_MAP) == manifest_actions
+
+
+def test_wecomcs_split_string_by_bytes_keeps_multibyte_boundaries():
+    parts = split_string_by_bytes('你好hello', limit=7)
+
+    assert ''.join(parts) == '你好hello'
+    assert all(len(part.encode('utf-8')) <= 7 for part in parts)
+
+
+@pytest.mark.asyncio
+async def test_wecomcs_message_converter_maps_outbound_components():
+    adapter = make_adapter()
+    content = await WecomCSMessageConverter.yiri2target(
+        platform_message.MessageChain(
+            [
+                platform_message.Plain(text='hi'),
+                platform_message.Image(base64='data:image/png;base64,AAAA'),
+                platform_message.Quote(
+                    id='origin',
+                    origin=platform_message.MessageChain([platform_message.Plain(text='quoted')]),
+                ),
+                platform_message.At(target='external-2', display='Bob'),
+                platform_message.AtAll(),
+            ]
+        ),
+        adapter.bot,
+    )
+
+    assert content[0] == {'type': 'text', 'content': 'hi'}
+    assert {'type': 'image', 'media_id': 'media-id'} in content
+    assert {'type': 'text', 'content': '[Quote origin] '} in content
+    assert {'type': 'text', 'content': 'quoted'} in content
+    assert {'type': 'text', 'content': '@Bob'} in content
+    assert {'type': 'text', 'content': '@all'} in content
+
+
+@pytest.mark.asyncio
+async def test_wecomcs_message_converter_rejects_unsupported_outbound_media():
+    adapter = make_adapter()
+
+    with pytest.raises(NotSupportedError):
+        await WecomCSMessageConverter.yiri2target(
+            platform_message.MessageChain([platform_message.Voice(base64='BBBB')]),
+            adapter.bot,
+        )
+
+
+@pytest.mark.asyncio
+async def test_wecomcs_event_converter_maps_text_message_to_eba_and_legacy():
+    adapter = make_adapter()
+    event = await WecomCSEventConverter.target2yiri(wecomcs_event(), adapter.bot)
+
+    assert isinstance(event, platform_events.MessageReceivedEvent)
+    assert event.adapter_name == 'wecomcs-eba'
+    assert event.chat_type == platform_entities.ChatType.PRIVATE
+    assert event.chat_id == 'external-1|kf-1'
+    assert event.sender.nickname == 'Alice'
+    assert str(event.message_chain) == 'hello'
+
+    legacy = await WecomCSEventConverter.target2legacy(wecomcs_event(), adapter.bot)
+    assert isinstance(legacy, platform_events.FriendMessage)
+    assert legacy.sender.id == 'external-1'
+    assert str(legacy.message_chain) == 'hello'
+
+
+@pytest.mark.asyncio
+async def test_wecomcs_event_converter_maps_media_and_unknown_messages():
+    image_event = await WecomCSEventConverter.target2yiri(wecomcs_event(msgtype='image'), make_adapter().bot)
+    file_event = await WecomCSEventConverter.target2yiri(wecomcs_event(msgtype='file'), make_adapter().bot)
+    voice_event = await WecomCSEventConverter.target2yiri(wecomcs_event(msgtype='voice'), make_adapter().bot)
+    unknown_event = await WecomCSEventConverter.target2yiri(wecomcs_event(msgtype='event'), make_adapter().bot)
+
+    assert isinstance(image_event.message_chain[1], platform_message.Image)
+    assert image_event.message_chain[1].base64 == 'data:image/png;base64,AAAA'
+    assert isinstance(file_event.message_chain[1], platform_message.File)
+    assert isinstance(voice_event.message_chain[1], platform_message.Voice)
+    assert isinstance(unknown_event, platform_events.PlatformSpecificEvent)
+    assert unknown_event.action == 'wecomcs.event'
+
+
+@pytest.mark.asyncio
+async def test_wecomcs_adapter_dispatches_eba_and_legacy_and_caches_message_event():
+    adapter = make_adapter()
+    eba_calls: list[platform_events.Event] = []
+    legacy_calls: list[platform_events.Event] = []
+
+    async def eba_listener(event, adapter):
+        eba_calls.append(event)
+
+    async def legacy_listener(event, adapter):
+        legacy_calls.append(event)
+
+    adapter.register_listener(platform_events.MessageReceivedEvent, eba_listener)
+    adapter.register_listener(platform_events.FriendMessage, legacy_listener)
+    await adapter._handle_native_event(wecomcs_event())
+
+    assert len(eba_calls) == 1
+    assert len(legacy_calls) == 1
+    received = eba_calls[0]
+    assert isinstance(received, platform_events.MessageReceivedEvent)
+    assert adapter.bot_account_id == 'kf-1'
+    assert await adapter.get_message('private', 'external-1|kf-1', 'msg-1') == received
+    assert (await adapter.get_user_info('external-1')).nickname == 'Alice'
+
+    await adapter._handle_native_event(wecomcs_event())
+    assert len(eba_calls) == 1
+    assert len(legacy_calls) == 1
+
+
+@pytest.mark.asyncio
+async def test_wecomcs_send_reply_and_platform_api_use_underlying_client():
+    adapter = make_adapter()
+    message = platform_message.MessageChain([platform_message.Plain(text='hello')])
+
+    await adapter.send_message('person', 'external-1|kf-1', message)
+    adapter.bot.send_text_msg.assert_awaited_once()
+    open_kfid, external_userid, msgid, content = adapter.bot.send_text_msg.await_args.args
+    assert (open_kfid, external_userid, content) == ('kf-1', 'external-1', 'hello')
+    assert msgid.startswith('lb-')
+
+    image = platform_message.MessageChain([platform_message.Image(base64='data:image/png;base64,AAAA')])
+    await adapter.send_message('person', 'external-1|kf-1', image)
+    adapter.bot.send_image_msg.assert_awaited_once()
+
+    source_event = await WecomCSEventConverter.target2yiri(wecomcs_event(), adapter.bot)
+    await adapter.reply_message(source_event, message)
+    open_kfid, external_userid, reply_msgid, content = adapter.bot.send_text_msg.await_args.args
+    assert (open_kfid, external_userid, content) == ('kf-1', 'external-1', 'hello')
+    assert reply_msgid.startswith('lb-')
+
+    token_status = await adapter.call_platform_api('check_access_token', {})
+    customer_info = await adapter.call_platform_api('get_customer_info', {'external_userid': 'external-1'})
+
+    assert token_status == {'valid': True}
+    assert customer_info['nickname'] == 'Alice'