feat(wecom): implement Dify human input pause handling with button interaction support

src/langbot/libs/wecom_ai_bot_api/api.py

@@ -67,6 +67,16 @@ class StreamSession:
     # 反馈 ID，用于接收用户点赞/点踩反馈
     feedback_id: Optional[str] = None
 
+    # Dify 人工输入暂停态：runner 把 _form_data 传过来时填充。
+    # 一旦设置，下次企微 followup 请求时返回 button_interaction 模板卡
+    # 替代 stream chunk。点击按钮会回调 template_card_event，EventKey
+    # 就是 Dify 的 action_id。
+    pending_form: Optional[dict] = None
+
+    # template_card task_id（企微要求 button_interaction 必填且不可重复）。
+    # 创建 pending_form 时生成；按钮点击回调里用来反查 session。
+    pending_form_task_id: Optional[str] = None
+
 
 class StreamSessionManager:
     """管理 stream 会话的生命周期，并负责队列的生产消费。"""
@@ -83,6 +93,9 @@ class StreamSessionManager:
         self._sessions: dict[str, StreamSession] = {}  # stream_id -> StreamSession 映射
         self._msg_index: dict[str, str] = {}  # msgid -> stream_id 映射，便于流水线根据消息 ID 找到会话
         self._feedback_index: dict[str, str] = {}  # feedback_id -> stream_id 映射
+        # task_id (button_interaction template_card 的) -> stream_id 映射，
+        # 用于按钮点击回调里反查 pending_form。
+        self._task_index: dict[str, str] = {}
 
     def get_stream_id_by_msg(self, msg_id: str) -> Optional[str]:
         if not msg_id:
@@ -118,6 +131,40 @@ class StreamSessionManager:
         if feedback_id and stream_id:
             self._feedback_index[feedback_id] = stream_id
 
+    def set_pending_form(self, stream_id: str, form_data: dict, task_id: str) -> None:
+        """把 Dify 人工输入暂停态绑定到 stream session。
+
+        下一次企微 followup 请求时，adapter 检测到 pending_form，
+        返回 button_interaction 模板卡而不是 stream chunk。
+        """
+        session = self._sessions.get(stream_id)
+        if not session:
+            return
+        session.pending_form = form_data
+        session.pending_form_task_id = task_id
+        if task_id:
+            self._task_index[task_id] = stream_id
+
+    def get_session_by_task_id(self, task_id: str) -> Optional[StreamSession]:
+        """按按钮点击回调里的 TaskId 反查 session。"""
+        if not task_id:
+            return None
+        stream_id = self._task_index.get(task_id)
+        if not stream_id:
+            return None
+        return self._sessions.get(stream_id)
+
+    def clear_pending_form(self, stream_id: str) -> None:
+        """按钮点击消费完后清掉 pending_form，避免重复弹卡。"""
+        session = self._sessions.get(stream_id)
+        if not session:
+            return
+        task_id = session.pending_form_task_id
+        session.pending_form = None
+        session.pending_form_task_id = None
+        if task_id:
+            self._task_index.pop(task_id, None)
+
     def create_or_get(self, msg_json: dict[str, Any]) -> tuple[StreamSession, bool]:
         """根据企业微信回调创建或获取会话。
 
@@ -723,6 +770,79 @@ async def parse_wecom_bot_message(
     return message_data
 
 
+def build_button_interaction_payload(form_data: dict, task_id: str) -> dict[str, Any]:
+    """Build a `template_card` (button_interaction) WeCom payload.
+
+    Shared by both the webhook-mode client (returns the payload as the
+    response to a stream-followup callback) and the ws_client (sends it
+    as a reply frame). Output shape is `{"msgtype": "template_card",
+    "template_card": {...}}` per the WeCom spec.
+
+    Args:
+        form_data: Dify human-input form data with keys ``actions`` (list of
+            ``{id, title, button_style}``), ``node_title``, ``form_content``.
+        task_id: Unique per-card identifier. WeCom requires this for
+            button_interaction. The click callback returns it as TaskId so we
+            can find the originating session.
+
+    Notes:
+        * ``button.key`` is set directly to the Dify ``action_id``. The click
+          callback's ``EventKey`` carries this back unchanged (1024-byte limit
+          per the spec, far more than we ever need).
+        * WeCom caps the button list at 6. Extra actions are appended to
+          ``sub_title_text`` so users can still reply with the id as text.
+        * Styles map ``primary``→1 (blue), ``danger``→2 (red), default→0
+          (gray). First button is auto-promoted to primary when no style.
+    """
+    actions = list(form_data.get('actions') or [])
+    node_title = (form_data.get('node_title') or '').strip() or '人工介入'
+    form_content = (form_data.get('form_content') or '').strip()
+
+    visible_actions = actions[:6]
+    overflow = actions[6:]
+
+    sub_title_parts: list[str] = []
+    if form_content:
+        sub_title_parts.append(form_content)
+    if overflow:
+        extra_lines = [f'  - {a.get("title") or a.get("id") or ""} (回复 id: {a.get("id") or ""})' for a in overflow]
+        sub_title_parts.append(f'另有 {len(overflow)} 个选项不在按钮列表中，可直接回复 id：\n' + '\n'.join(extra_lines))
+    sub_title_text = '\n\n'.join(sub_title_parts) or '请选择一个操作以继续。'
+
+    button_list = []
+    for idx, action in enumerate(visible_actions):
+        action_id = str(action.get('id') or '')
+        title = str(action.get('title') or action_id or f'选项 {idx + 1}')
+        style_raw = (action.get('button_style') or '').lower()
+        if style_raw == 'primary' or (style_raw == '' and idx == 0):
+            style = 1
+        elif style_raw == 'danger':
+            style = 2
+        else:
+            style = 0
+        button_list.append(
+            {
+                'text': title,
+                'style': style,
+                'key': action_id,
+            }
+        )
+
+    card = {
+        'card_type': 'button_interaction',
+        'main_title': {
+            'title': node_title,
+        },
+        'sub_title_text': sub_title_text,
+        'button_list': button_list,
+        'task_id': task_id,
+    }
+    return {
+        'msgtype': 'template_card',
+        'template_card': card,
+    }
+
+
 class WecomBotClient:
     def __init__(self, Token: str, EnCodingAESKey: str, Corpid: str, logger: EventLogger, unified_mode: bool = False):
         """企业微信智能机器人客户端。
@@ -761,6 +881,7 @@ class WecomBotClient:
         self.stream_poll_timeout = 0.5
 
         self._feedback_callback: Optional[Callable] = None
+        self._card_action_callback: Optional[Callable] = None
 
     def set_feedback_callback(self, callback: Callable) -> None:
         """设置反馈回调函数。
@@ -770,6 +891,19 @@ class WecomBotClient:
         """
         self._feedback_callback = callback
 
+    def set_card_action_callback(self, callback: Callable) -> None:
+        """设置按钮卡片点击回调函数。
+
+        Signature: ``async def callback(session, action_id, task_id, raw_event) -> None``
+
+        ``session`` is the StreamSession the card was attached to;
+        ``action_id`` is the Dify action_id reflected back via the
+        button's ``key`` field; ``task_id`` is the card's task_id
+        (matches ``session.pending_form_task_id``); ``raw_event`` is the
+        decoded callback JSON for any extra fields the adapter wants.
+        """
+        self._card_action_callback = callback
+
     @staticmethod
     def _build_stream_payload(
         stream_id: str, content: str, finish: bool, feedback_id: Optional[str] = None
@@ -800,6 +934,12 @@ class WecomBotClient:
             'stream': stream_payload,
         }
 
+    @staticmethod
+    def _build_button_interaction_payload(form_data: dict, task_id: str) -> dict[str, Any]:
+        """Class-level shim — delegates to module-level builder so ws_client
+        can reuse the exact same payload shape without importing the class."""
+        return build_button_interaction_payload(form_data, task_id)
+
     async def _encrypt_and_reply(self, payload: dict[str, Any], nonce: str) -> tuple[Response, int]:
         """对响应进行加密封装并返回给企业微信。
 
@@ -892,6 +1032,22 @@ class WecomBotClient:
             return await self._encrypt_and_reply(self._build_stream_payload('', '', True), nonce)
 
         session = self.stream_sessions.get_session(stream_id)
+
+        # If a Dify human-input pause arrived during this stream, switch
+        # the response from `msgtype: stream` to `msgtype: template_card`
+        # (button_interaction). The session's stream is also marked
+        # finished so future followups aren't expected (assuming the
+        # WeCom client treats template_card as the terminal response —
+        # we'll know from the next callback whether it kept polling).
+        if session and session.pending_form and session.pending_form_task_id:
+            await self.logger.info(
+                f'WeComBot: returning button_interaction for stream_id={stream_id} '
+                f'task_id={session.pending_form_task_id} actions={len(session.pending_form.get("actions") or [])}'
+            )
+            card_payload = self._build_button_interaction_payload(session.pending_form, session.pending_form_task_id)
+            self.stream_sessions.mark_finished(stream_id)
+            return await self._encrypt_and_reply(card_payload, nonce)
+
         chunk = await self.stream_sessions.consume(stream_id, timeout=self.stream_poll_timeout)
 
         if not chunk:
@@ -1000,11 +1156,50 @@ class WecomBotClient:
         if event_type == 'feedback_event':
             return await self._handle_feedback_event(msg_json, nonce)
 
+        # Button click on a button_interaction template_card. The WeCom doc
+        # calls this `template_card_event`; some routes wrap the button
+        # event payload inside `event.template_card_event`.
+        if event_type == 'template_card_event':
+            return await self._handle_template_card_event(msg_json, nonce)
+
         if msg_json.get('msgtype') == 'stream':
             return await self._handle_post_followup_response(msg_json, nonce)
 
         return await self._handle_post_initial_response(msg_json, nonce)
 
+    async def _handle_template_card_event(self, msg_json: dict[str, Any], nonce: str) -> tuple[Response, int]:
+        """Handle a button click on a button_interaction template_card.
+
+        WeCom carries the click info in ``event.template_card_event`` with
+        ``TaskId`` matching the card we created and ``EventKey`` carrying
+        the button's ``key`` (which we set to the Dify ``action_id``).
+        """
+        try:
+            tce = msg_json.get('event', {}).get('template_card_event', {})
+            task_id = tce.get('TaskId') or tce.get('task_id') or ''
+            event_key = tce.get('EventKey') or tce.get('event_key') or ''
+            card_type = tce.get('CardType') or tce.get('card_type') or ''
+
+            await self.logger.info(f'收到按钮点击: task_id={task_id} event_key={event_key!r} card_type={card_type}')
+
+            session = self.stream_sessions.get_session_by_task_id(task_id)
+            if session is None:
+                await self.logger.warning(f'未找到 task_id={task_id} 对应的 session，按钮点击被丢弃')
+            else:
+                if self._card_action_callback is not None:
+                    try:
+                        await self._card_action_callback(session, event_key, task_id, msg_json)
+                    except Exception:
+                        await self.logger.error(f'card action callback raised: {traceback.format_exc()}')
+                # Drop the form so a fresh chunk/followup doesn't re-render
+                # the same card (and so the task_id can be GC'd).
+                self.stream_sessions.clear_pending_form(session.stream_id)
+        except Exception:
+            await self.logger.error(f'_handle_template_card_event error: {traceback.format_exc()}')
+
+        # WeCom expects an empty success ack for event callbacks.
+        return await self._encrypt_and_reply({}, nonce)
+
     async def _handle_feedback_event(self, msg_json: dict[str, Any], nonce: str) -> tuple[Response, int]:
         """处理企业微信用户反馈事件（点赞/点踩）。
 
@@ -1114,6 +1309,29 @@ class WecomBotClient:
             self.stream_sessions.mark_finished(stream_id)
         return True
 
+    async def push_form_pause(
+        self, msg_id: str, form_data: dict, task_id: Optional[str] = None
+    ) -> tuple[bool, Optional[str], Optional[str]]:
+        """Attach a Dify human-input pause to the active stream session.
+
+        On the next WeCom followup poll, the response switches from
+        ``msgtype: stream`` to ``msgtype: template_card`` (button_interaction)
+        carrying the buttons. ``task_id`` is auto-generated if not provided
+        and is what the button-click callback uses to look the session back up.
+
+        Returns:
+            ``(ok, stream_id, task_id)``. ``ok`` is False if the
+            adapter's msg_id maps to no stream session (e.g. non-stream mode).
+        """
+        stream_id = self.stream_sessions.get_stream_id_by_msg(msg_id)
+        if not stream_id:
+            return False, None, None
+        if not task_id:
+            # WeCom requires task_id [A-Za-z0-9_-@], <= 128 bytes, unique per bot.
+            task_id = f'dify-{uuid.uuid4().hex[:24]}'
+        self.stream_sessions.set_pending_form(stream_id, form_data, task_id)
+        return True, stream_id, task_id
+
     async def set_message(self, msg_id: str, content: str):
         """兼容旧逻辑：若无法流式返回则缓存最终结果。
 

src/langbot/libs/wecom_ai_bot_api/ws_client.py

@@ -20,7 +20,11 @@ from typing import Any, Callable, Optional
 import aiohttp
 
 from langbot.libs.wecom_ai_bot_api import wecombotevent
-from langbot.libs.wecom_ai_bot_api.api import parse_wecom_bot_message, StreamSession
+from langbot.libs.wecom_ai_bot_api.api import (
+    parse_wecom_bot_message,
+    StreamSession,
+    build_button_interaction_payload,
+)
 from langbot.pkg.platform.logger import EventLogger
 
 DEFAULT_WS_URL = 'wss://openws.work.weixin.qq.com'
@@ -103,6 +107,18 @@ class WecomBotWsClient:
         # msg_id -> feedback_id (for associating feedback with message)
         self._msg_feedback_ids: dict[str, str] = {}  # msg_id -> feedback_id
 
+        # Dify human-input pause state for ws mode. Keys are task_id (echoed
+        # back in template_card_event.TaskId so we can rebuild the session
+        # context on click).
+        # task_id -> {form_data, msg_id, user_id, chat_id, stream_id, req_id}
+        self._pending_forms_by_task: dict[str, dict] = {}
+        # Reverse: msg_id -> task_id (for cleanup when stream finishes).
+        self._task_id_by_msg: dict[str, str] = {}
+        # Optional card-action callback registered by the adapter.
+        # Signature mirrors the http-mode WecomBotClient:
+        #   async def callback(session, action_id, task_id, raw_event) -> None
+        self._card_action_callback: Optional[Callable] = None
+
     # ── Public API ──────────────────────────────────────────────────
 
     async def connect(self):
@@ -236,6 +252,83 @@ class WecomBotWsClient:
         }
         return await self._send_reply(req_id, body)
 
+    async def reply_template_card(self, req_id: str, card_payload: dict[str, Any]) -> Optional[dict]:
+        """Send a template_card (button_interaction etc.) reply.
+
+        Args:
+            req_id: The req_id from the original message frame.
+            card_payload: Body produced by ``build_button_interaction_payload``;
+                must contain ``msgtype`` and ``template_card`` keys.
+
+        Returns:
+            ACK frame dict, or None on failure.
+        """
+        return await self._send_reply(req_id, card_payload)
+
+    def set_card_action_callback(self, callback: Callable) -> None:
+        """Register the button-click handler.
+
+        ``async def callback(session, action_id, task_id, raw_event) -> None``
+        — same signature as the http-mode WecomBotClient version so the
+        adapter can hand both off to the same coroutine.
+        """
+        self._card_action_callback = callback
+
+    async def push_form_pause(
+        self, msg_id: str, form_data: dict, task_id: Optional[str] = None
+    ) -> tuple[bool, Optional[str], Optional[str]]:
+        """Attach a Dify human-input pause to the active stream and send
+        the button_interaction card immediately.
+
+        ws mode has no notion of polled "followup" responses — each reply
+        is a one-shot frame send. So unlike the http path (which defers
+        card delivery to the next followup), here we just craft the card
+        and reply with it on the original req_id. The corresponding stream
+        session is then torn down so subsequent chunks don't re-send.
+
+        Returns:
+            ``(ok, stream_id, task_id)``. ``ok=False`` if no active stream
+            for this msg_id (e.g. message arrived in non-stream mode).
+        """
+        key = self._stream_ids.get(msg_id)
+        if not key:
+            return False, None, None
+        req_id, stream_id = key.split('|', 1)
+
+        if not task_id:
+            task_id = f'dify-{secrets.token_hex(12)}'
+
+        session_info = self._stream_sessions.get(msg_id) or {}
+        self._pending_forms_by_task[task_id] = {
+            'form_data': form_data,
+            'msg_id': msg_id,
+            'user_id': session_info.get('user_id', ''),
+            'chat_id': session_info.get('chat_id', ''),
+            'stream_id': stream_id,
+            'req_id': req_id,
+        }
+        self._task_id_by_msg[msg_id] = task_id
+
+        card_payload = build_button_interaction_payload(form_data, task_id)
+        try:
+            await self.reply_template_card(req_id, card_payload)
+        except Exception:
+            await self.logger.error(f'Failed to send button_interaction card: {traceback.format_exc()}')
+            # Roll back the bookkeeping so the next attempt isn't blocked.
+            self._pending_forms_by_task.pop(task_id, None)
+            self._task_id_by_msg.pop(msg_id, None)
+            return False, stream_id, None
+
+        # Tear down the stream — WeCom expects either stream chunks OR a
+        # template_card, not both on the same req_id. Subsequent
+        # push_stream_chunk calls for this msg_id become no-ops.
+        self._stream_ids.pop(msg_id, None)
+        self._stream_last_content.pop(msg_id, None)
+        # Keep _stream_sessions so the button callback can still resolve
+        # user/chat context; it gets cleaned up when the click fires.
+
+        return True, stream_id, task_id
+
     async def send_message(self, chat_id: str, content: str, msgtype: str = 'markdown') -> Optional[dict]:
         """Proactively send a message to a specified chat.
 
@@ -258,6 +351,23 @@ class WecomBotWsClient:
             body['text'] = {'content': content}
         return await self._send_reply(req_id, body, cmd=CMD_SEND_MSG)
 
+    async def send_template_card(self, chat_id: str, card_payload: dict[str, Any]) -> Optional[dict]:
+        """Proactively push a template_card to a chat.
+
+        Used for the resumed-workflow path (button click → new query):
+        synthetic events have no inbound req_id to reply against, so we
+        fall back to proactive ``aibot_send_msg`` instead of reply mode.
+
+        Args:
+            chat_id: userid (single chat) or chatid (group chat).
+            card_payload: ``{"msgtype": "template_card", "template_card": {...}}``
+                as produced by :func:`build_button_interaction_payload`.
+        """
+        req_id = _generate_req_id(CMD_SEND_MSG)
+        body = dict(card_payload)
+        body['chatid'] = chat_id
+        return await self._send_reply(req_id, body, cmd=CMD_SEND_MSG)
+
     async def push_stream_chunk(self, msg_id: str, content: str, is_final: bool = False) -> bool:
         """Push a streaming chunk for a given message ID.
 
@@ -568,6 +678,38 @@ class WecomBotWsClient:
                         await self.logger.error(f'Error in feedback handler: {traceback.format_exc()}')
                 return
 
+            if event_type == 'template_card_event':
+                tce = event_info.get('template_card_event', {})
+                task_id = tce.get('TaskId') or tce.get('task_id') or ''
+                event_key = tce.get('EventKey') or tce.get('event_key') or ''
+                card_type = tce.get('CardType') or tce.get('card_type') or ''
+                await self.logger.info(
+                    f'收到按钮点击 (ws): task_id={task_id} event_key={event_key!r} card_type={card_type}'
+                )
+                pending = self._pending_forms_by_task.get(task_id)
+                if pending is None:
+                    await self.logger.warning(f'未找到 task_id={task_id} 对应的 pending_form (ws)，按钮点击被丢弃')
+                elif self._card_action_callback is not None:
+                    try:
+                        session = StreamSession(
+                            stream_id=pending.get('stream_id', ''),
+                            msg_id=pending.get('msg_id', ''),
+                            chat_id=pending.get('chat_id') or None,
+                            user_id=pending.get('user_id') or None,
+                        )
+                        session.pending_form = pending.get('form_data')
+                        session.pending_form_task_id = task_id
+                        await self._card_action_callback(session, event_key, task_id, body)
+                    except Exception:
+                        await self.logger.error(f'card action callback raised (ws): {traceback.format_exc()}')
+                    # Consume — drop bookkeeping so a stale click can't re-fire.
+                    self._pending_forms_by_task.pop(task_id, None)
+                    msg_id = pending.get('msg_id', '')
+                    if msg_id:
+                        self._task_id_by_msg.pop(msg_id, None)
+                        self._stream_sessions.pop(msg_id, None)
+                return
+
             event = wecombotevent.WecomBotEvent(message_data)
 
             if event_type in self._message_handlers:

src/langbot/pkg/platform/sources/wecombot.py

@@ -296,6 +296,7 @@ class WecomBotAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter):
     listeners: dict = {}
     _stream_to_monitoring_msg: dict = {}  # Maps stream_id to (monitoring_message_id, timestamp)
     _STREAM_MAPPING_TTL = 600  # 10 minutes
+    ap: typing.Any = None
 
     def __init__(self, config: dict, logger: EventLogger):
         enable_webhook = config.get('enable-webhook', False)
@@ -336,6 +337,12 @@ class WecomBotAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter):
             _stream_to_monitoring_msg={},
         )
 
+        # Both WecomBotClient (webhook) and WecomBotWsClient (ws long-conn)
+        # expose ``set_card_action_callback``. Wire the click handler so
+        # Dify human-input button taps resume the workflow on either mode.
+        if hasattr(self.bot, 'set_card_action_callback'):
+            self.bot.set_card_action_callback(self._on_card_action)
+
     async def reply_message(
         self,
         message_source: platform_events.MessageEvent,
@@ -345,15 +352,37 @@ class WecomBotAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter):
         content = await self.message_converter.yiri2target(message)
         _ws_mode = not self.config.get('enable-webhook', False)
 
+        event = message_source.source_platform_object
+        # Synthetic events (button-click resume queries) have no inbound
+        # platform object. Fall back to a proactive send so error
+        # messages and one-shot replies still reach the user.
+        if event is None:
+            if _ws_mode:
+                if isinstance(message_source, platform_events.GroupMessage):
+                    chat_id = str(message_source.group.id)
+                else:
+                    chat_id = str(message_source.sender.id)
+                try:
+                    await self.bot.send_message(chat_id, content)
+                except Exception:
+                    await self.logger.error(
+                        f'WeComBot: proactive reply for synthetic event failed: {traceback.format_exc()}'
+                    )
+            else:
+                await self.logger.warning(
+                    'WeComBot webhook mode cannot reply to a synthetic event '
+                    '(no req_id and no proactive-send credentials); dropping.'
+                )
+            return
+
         if _ws_mode:
-            event = message_source.source_platform_object
-            req_id = event.get('req_id', '')
+            req_id = event.get('req_id', '') if isinstance(event, dict) else getattr(event, 'req_id', '')
             if req_id:
                 await self.bot.reply_text(req_id, content)
             else:
                 await self.bot.set_message(event.message_id, content)
         else:
-            await self.bot.set_message(message_source.source_platform_object.message_id, content)
+            await self.bot.set_message(event.message_id, content)
 
     async def reply_message_chunk(
         self,
@@ -364,9 +393,56 @@ class WecomBotAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter):
         is_final: bool = False,
     ):
         content = await self.message_converter.yiri2target(message)
-        msg_id = message_source.source_platform_object.message_id
         _ws_mode = not self.config.get('enable-webhook', False)
 
+        # Synthetic events (e.g. button-click triggered form resume) have
+        # no inbound platform message — no msg_id, no req_id, no stream
+        # session. The output must go via the proactive-send path instead
+        # of the stream/reply path.
+        spo = message_source.source_platform_object
+        if spo is None:
+            return await self._handle_synthetic_chunk(message_source, bot_message, content, is_final, _ws_mode)
+
+        msg_id = spo.message_id
+
+        # Dify human-input pause: when the runner attaches `_form_data` to
+        # the final chunk, hand the button_interaction card off to the
+        # underlying client. In webhook mode the card is queued for the
+        # next followup poll; in ws mode it's sent as a reply frame
+        # immediately. Falls back to plain text when the bot has no active
+        # stream session for this msg_id (rare).
+        form_data = getattr(bot_message, '_form_data', None)
+        if form_data and is_final:
+            if hasattr(self.bot, 'push_form_pause'):
+                ok, stream_id, task_id = await self.bot.push_form_pause(msg_id, form_data)
+                if ok:
+                    await self.logger.info(
+                        f'WeComBot: pending button_interaction registered '
+                        f'stream_id={stream_id} task_id={task_id} ws_mode={_ws_mode}'
+                    )
+                    return {'stream': True, 'form': True, 'task_id': task_id}
+            await self.logger.warning(
+                'WeComBot: cannot register form pause (no active stream session); falling back to plain text'
+            )
+            try:
+                from langbot.pkg.provider.runners.difysvapi import _format_human_input_text
+
+                fallback = _format_human_input_text(
+                    form_data.get('node_title', ''),
+                    form_data.get('form_content', ''),
+                    form_data.get('actions', []) or [],
+                )
+            except Exception:
+                fallback = content or '（人工输入）'
+            if _ws_mode:
+                event = message_source.source_platform_object
+                req_id = event.get('req_id', '') if isinstance(event, dict) else getattr(event, 'req_id', '')
+                if req_id:
+                    await self.bot.reply_text(req_id, fallback)
+            else:
+                await self.bot.set_message(msg_id, fallback)
+            return {'stream': False, 'form': True, 'fallback': True}
+
         if _ws_mode:
             success = await self.bot.push_stream_chunk(msg_id, content, is_final=is_final)
             if not success and is_final:
@@ -385,6 +461,129 @@ class WecomBotAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter):
         """Whether streaming output is enabled for this bot instance."""
         return self.config.get('enable-stream-reply', True)
 
+    async def _handle_synthetic_chunk(
+        self,
+        message_source: platform_events.MessageEvent,
+        bot_message,
+        content: str,
+        is_final: bool,
+        ws_mode: bool,
+    ) -> dict:
+        """Handle reply_message_chunk for synthetic events (button clicks).
+
+        Synthetic events have no inbound message → no msg_id, no req_id,
+        no stream session. We can't do incremental streaming, so we
+        buffer chunks per-conversation and flush on ``is_final`` via the
+        proactive send path.
+
+        Buffer keyed by ``(launcher_type, launcher_id)`` from the
+        synthetic event itself. Only ws mode has a usable proactive-send
+        path right now (``ws_client.send_message`` /
+        ``ws_client.send_template_card``); webhook mode requires a
+        corpid/secret we don't have, so it logs and drops.
+        """
+        if isinstance(message_source, platform_events.GroupMessage):
+            chat_id = str(message_source.group.id)
+        else:
+            chat_id = str(message_source.sender.id)
+
+        form_data = getattr(bot_message, '_form_data', None)
+
+        # Buffer streaming content until is_final.
+        buf_key = chat_id
+        if not hasattr(self, '_synthetic_buffers'):
+            # Attribute-not-declared trick: pydantic forbids dynamic attrs
+            # on the model, but plain instance dicts via object.__setattr__
+            # do work. Lazy-create on first call.
+            object.__setattr__(self, '_synthetic_buffers', {})
+        buffers: dict[str, str] = self._synthetic_buffers
+        if content and not form_data:
+            buffers[buf_key] = buffers.get(buf_key, '') + content
+
+        if not is_final:
+            return {'stream': True, 'synthetic': True, 'buffered': True}
+
+        final_content = buffers.pop(buf_key, '')
+        if content and final_content.startswith(content):
+            # is_final chunk re-emitted the full accumulated text — keep
+            # whichever is longer.
+            final_content = final_content if len(final_content) >= len(content) else content
+        elif content and not final_content:
+            final_content = content
+
+        if not ws_mode:
+            await self.logger.warning(
+                'WeComBot webhook mode cannot proactively push synthetic-event '
+                'output (no corpid/secret); the resume reply is dropped. '
+                f'content_len={len(final_content)} form_data_present={form_data is not None}'
+            )
+            return {'stream': False, 'synthetic': True, 'dropped': True}
+
+        # ws mode: proactive send.
+        try:
+            if form_data:
+                # Determine user_id / chat_id for the routing context of any
+                # subsequent click on this card.
+                if isinstance(message_source, platform_events.GroupMessage):
+                    routing_chat_id = str(message_source.group.id)
+                    routing_user_id = str(message_source.sender.id)
+                else:
+                    routing_chat_id = ''
+                    routing_user_id = str(message_source.sender.id)
+                payload = self._build_button_interaction_payload_from_form(
+                    form_data,
+                    user_id=routing_user_id,
+                    chat_id=routing_chat_id,
+                )
+                await self.bot.send_template_card(chat_id, payload)
+                await self.logger.info(
+                    f'WeComBot ws: proactively sent template_card for synthetic event '
+                    f'chat_id={chat_id} form_token={form_data.get("form_token")!r} '
+                    f'workflow_run_id={form_data.get("workflow_run_id")!r}'
+                )
+            elif final_content:
+                await self.bot.send_message(chat_id, final_content)
+                await self.logger.info(
+                    f'WeComBot ws: proactively sent text for synthetic event chat_id={chat_id} len={len(final_content)}'
+                )
+        except Exception:
+            await self.logger.error(f'WeComBot: synthetic event proactive send failed: {traceback.format_exc()}')
+            return {'stream': False, 'synthetic': True, 'error': True}
+
+        return {'stream': True, 'synthetic': True}
+
+    def _build_button_interaction_payload_from_form(
+        self, form_data: dict, *, user_id: str = '', chat_id: str = ''
+    ) -> dict:
+        """Build a button_interaction payload + track task_id for click resolution.
+
+        Unlike the inbound-event path (where push_form_pause registers the
+        task_id with the active stream session), proactive sends still
+        need the task_id registered so button clicks find pending_form.
+        For ws mode we stash it directly on the ws_client's pending dict.
+        """
+        from langbot.libs.wecom_ai_bot_api.api import build_button_interaction_payload
+        import secrets as _secrets
+
+        task_id = f'dify-{_secrets.token_hex(12)}'
+        payload = build_button_interaction_payload(form_data, task_id)
+
+        # Register task_id → form_data so the click callback can find it.
+        # user_id / chat_id are required so _on_card_action can route the
+        # resulting synthetic query back to the right user. msg_id / req_id
+        # / stream_id are intentionally empty — synthetic cards have no
+        # inbound message to anchor on.
+        if hasattr(self.bot, '_pending_forms_by_task'):
+            self.bot._pending_forms_by_task[task_id] = {
+                'form_data': form_data,
+                'msg_id': '',
+                'user_id': user_id,
+                'chat_id': chat_id,
+                'stream_id': '',
+                'req_id': '',
+            }
+        return payload
+
     async def send_message(self, target_type, target_id, message):
         _ws_mode = not self.config.get('enable-webhook', False)
         if _ws_mode:
@@ -531,3 +730,114 @@ class WecomBotAdapter(abstract_platform_adapter.AbstractMessagePlatformAdapter):
 
     async def is_muted(self, group_id: int) -> bool:
         pass
+
+    # ------------------------------------------------------------------
+    # Dify human-input button-interaction click handling
+    # ------------------------------------------------------------------
+
+    async def _on_card_action(self, session, action_id: str, task_id: str, raw_event: dict) -> None:
+        """Translate a button click on a button_interaction card into a
+        synthetic ``_dify_form_action`` query enqueued on the pool.
+
+        Pattern mirrors DingTalk / Lark / Telegram so the runner's
+        ``_merge_pending_form_action`` path resumes the workflow.
+        """
+        import langbot_plugin.api.entities.builtin.provider.session as provider_session
+
+        form = session.pending_form or {}
+        await self.logger.info(
+            f'WeComBot _on_card_action: task_id={task_id} action_id={action_id!r} '
+            f'form_token={form.get("form_token")!r} workflow_run_id={form.get("workflow_run_id")!r} '
+            f'session.user_id={session.user_id!r} session.chat_id={session.chat_id!r}'
+        )
+
+        actions = form.get('actions') or []
+        clean_action_id = (action_id or '').strip()
+        action_title = clean_action_id
+        for a in actions:
+            if str(a.get('id', '')) == clean_action_id:
+                action_title = a.get('title') or clean_action_id
+                break
+
+        launcher_id = session.user_id or session.chat_id or ''
+        sender_user_id = session.user_id or launcher_id
+        # WeCom AI bot has both single-chat and group-chat; chat_id present
+        # indicates group context.
+        if session.chat_id:
+            launcher_type = provider_session.LauncherTypes.GROUP
+            launcher_id = session.chat_id
+        else:
+            launcher_type = provider_session.LauncherTypes.PERSON
+            launcher_id = session.user_id or ''
+
+        form_action_data = {
+            'form_token': form.get('form_token', ''),
+            'workflow_run_id': form.get('workflow_run_id', ''),
+            'action_id': clean_action_id,
+            'action_title': action_title,
+            'node_title': form.get('node_title', ''),
+            'user': f'{launcher_type.value}_{launcher_id}',
+            'inputs': {},
+        }
+
+        message_chain = platform_message.MessageChain([platform_message.Plain(text=f'[Form Action: {action_title}]')])
+
+        if launcher_type == provider_session.LauncherTypes.GROUP:
+            synthetic_event = platform_events.GroupMessage(
+                sender=platform_entities.GroupMember(
+                    id=sender_user_id,
+                    member_name='',
+                    permission=platform_entities.Permission.Member,
+                    group=platform_entities.Group(
+                        id=launcher_id,
+                        name='',
+                        permission=platform_entities.Permission.Member,
+                    ),
+                    special_title='',
+                ),
+                message_chain=message_chain,
+                time=int(time.time()),
+                source_platform_object=None,
+            )
+        else:
+            synthetic_event = platform_events.FriendMessage(
+                sender=platform_entities.Friend(
+                    id=sender_user_id,
+                    nickname='',
+                    remark='',
+                ),
+                message_chain=message_chain,
+                time=int(time.time()),
+                source_platform_object=None,
+            )
+
+        if self.ap is None:
+            await self.logger.error('WeComBot: ap not injected; cannot enqueue button-click query')
+            return
+
+        bot_uuid = ''
+        pipeline_uuid = None
+        for bot in self.ap.platform_mgr.bots:
+            if bot.adapter is self:
+                bot_uuid = bot.bot_entity.uuid
+                pipeline_uuid = bot.bot_entity.use_pipeline_uuid
+                break
+
+        try:
+            await self.ap.query_pool.add_query(
+                bot_uuid=bot_uuid,
+                launcher_type=launcher_type,
+                launcher_id=launcher_id,
+                sender_id=sender_user_id,
+                message_event=synthetic_event,
+                message_chain=message_chain,
+                adapter=self,
+                pipeline_uuid=pipeline_uuid,
+                variables={
+                    '_dify_form_action': form_action_data,
+                    '_routed_by_rule': True,
+                },
+            )
+            await self.logger.info(f'WeComBot: button-click query enqueued action_id={clean_action_id!r}')
+        except Exception:
+            await self.logger.error(f'WeComBot: enqueue button-click query failed: {traceback.format_exc()}')