diff --git a/hermes_cli/platforms.py b/hermes_cli/platforms.py
index 18307912b..df47ed095 100644
--- a/hermes_cli/platforms.py
+++ b/hermes_cli/platforms.py
@@ -33,6 +33,7 @@ PLATFORMS: OrderedDict[str, PlatformInfo] = OrderedDict([
     ("dingtalk",       PlatformInfo(label="💬 DingTalk",        default_toolset="hermes-dingtalk")),
     ("feishu",         PlatformInfo(label="🪽 Feishu",          default_toolset="hermes-feishu")),
     ("wecom",          PlatformInfo(label="💬 WeCom",           default_toolset="hermes-wecom")),
+    ("wecom_callback", PlatformInfo(label="💬 WeCom Callback",  default_toolset="hermes-wecom-callback")),
     ("weixin",         PlatformInfo(label="💬 Weixin",          default_toolset="hermes-weixin")),
     ("webhook",        PlatformInfo(label="🔗 Webhook",         default_toolset="hermes-webhook")),
     ("api_server",     PlatformInfo(label="🌐 API Server",      default_toolset="hermes-api-server")),
diff --git a/hermes_cli/setup.py b/hermes_cli/setup.py
index a25ce8491..e12f7d1a7 100644
--- a/hermes_cli/setup.py
+++ b/hermes_cli/setup.py
@@ -2005,6 +2005,12 @@ def _setup_wecom():
     _gateway_setup_wecom()
 
 
+def _setup_wecom_callback():
+    """Configure WeCom Callback (self-built app) via gateway setup."""
+    from hermes_cli.gateway import _setup_wecom_callback as _gw_setup
+    _gw_setup()
+
+
 def _setup_bluebubbles():
     """Configure BlueBubbles iMessage gateway."""
     print_header("BlueBubbles (iMessage)")
@@ -2130,6 +2136,7 @@ _GATEWAY_PLATFORMS = [
     ("DingTalk", "DINGTALK_CLIENT_ID", _setup_dingtalk),
     ("Feishu / Lark", "FEISHU_APP_ID", _setup_feishu),
     ("WeCom (Enterprise WeChat)", "WECOM_BOT_ID", _setup_wecom),
+    ("WeCom Callback (Self-Built App)", "WECOM_CALLBACK_CORP_ID", _setup_wecom_callback),
     ("Weixin (WeChat)", "WEIXIN_ACCOUNT_ID", _setup_weixin),
     ("BlueBubbles (iMessage)", "BLUEBUBBLES_SERVER_URL", _setup_bluebubbles),
     ("Webhooks (GitHub, GitLab, etc.)", "WEBHOOK_ENABLED", _setup_webhooks),
diff --git a/hermes_cli/status.py b/hermes_cli/status.py
index 7a7a9c645..c48c0008b 100644
--- a/hermes_cli/status.py
+++ b/hermes_cli/status.py
@@ -302,6 +302,7 @@ def show_status(args):
         "DingTalk": ("DINGTALK_CLIENT_ID", None),
         "Feishu": ("FEISHU_APP_ID", "FEISHU_HOME_CHANNEL"),
         "WeCom": ("WECOM_BOT_ID", "WECOM_HOME_CHANNEL"),
+        "WeCom Callback": ("WECOM_CALLBACK_CORP_ID", None),
         "Weixin": ("WEIXIN_ACCOUNT_ID", "WEIXIN_HOME_CHANNEL"),
         "BlueBubbles": ("BLUEBUBBLES_SERVER_URL", "BLUEBUBBLES_HOME_CHANNEL"),
     }
diff --git a/website/docs/developer-guide/adding-platform-adapters.md b/website/docs/developer-guide/adding-platform-adapters.md
new file mode 100644
index 000000000..1ddb07f08
--- /dev/null
+++ b/website/docs/developer-guide/adding-platform-adapters.md
@@ -0,0 +1,256 @@
+---
+sidebar_position: 9
+---
+
+# Adding a Platform Adapter
+
+This guide covers adding a new messaging platform to the Hermes gateway. A platform adapter connects Hermes to an external messaging service (Telegram, Discord, WeCom, etc.) so users can interact with the agent through that service.
+
+:::tip
+Adding a platform adapter touches 20+ files across code, config, and docs. Use this guide as a checklist — the adapter file itself is typically only 40% of the work.
+:::
+
+## Architecture Overview
+
+```
+User ↔ Messaging Platform ↔ Platform Adapter ↔ Gateway Runner ↔ AIAgent
+```
+
+Every adapter extends `BasePlatformAdapter` from `gateway/platforms/base.py` and implements:
+
+- **`connect()`** — Establish connection (WebSocket, long-poll, HTTP server, etc.)
+- **`disconnect()`** — Clean shutdown
+- **`send()`** — Send a text message to a chat
+- **`send_typing()`** — Show typing indicator (optional)
+- **`get_chat_info()`** — Return chat metadata
+
+Inbound messages are received by the adapter and forwarded via `self.handle_message(event)`, which the base class routes to the gateway runner.
+
+## Step-by-Step Checklist
+
+### 1. Platform Enum
+
+Add your platform to the `Platform` enum in `gateway/config.py`:
+
+```python
+class Platform(str, Enum):
+    # ... existing platforms ...
+    NEWPLAT = "newplat"
+```
+
+### 2. Adapter File
+
+Create `gateway/platforms/newplat.py`:
+
+```python
+from gateway.config import Platform, PlatformConfig
+from gateway.platforms.base import (
+    BasePlatformAdapter, MessageEvent, MessageType, SendResult,
+)
+
+def check_newplat_requirements() -> bool:
+    """Return True if dependencies are available."""
+    return SOME_SDK_AVAILABLE
+
+class NewPlatAdapter(BasePlatformAdapter):
+    def __init__(self, config: PlatformConfig):
+        super().__init__(config, Platform.NEWPLAT)
+        # Read config from config.extra dict
+        extra = config.extra or {}
+        self._api_key = extra.get("api_key") or os.getenv("NEWPLAT_API_KEY", "")
+
+    async def connect(self) -> bool:
+        # Set up connection, start polling/webhook
+        self._mark_connected()
+        return True
+
+    async def disconnect(self) -> None:
+        self._running = False
+        self._mark_disconnected()
+
+    async def send(self, chat_id, content, reply_to=None, metadata=None):
+        # Send message via platform API
+        return SendResult(success=True, message_id="...")
+
+    async def get_chat_info(self, chat_id):
+        return {"name": chat_id, "type": "dm"}
+```
+
+For inbound messages, build a `MessageEvent` and call `self.handle_message(event)`:
+
+```python
+source = self.build_source(
+    chat_id=chat_id,
+    chat_name=name,
+    chat_type="dm",  # or "group"
+    user_id=user_id,
+    user_name=user_name,
+)
+event = MessageEvent(
+    text=content,
+    message_type=MessageType.TEXT,
+    source=source,
+    message_id=msg_id,
+)
+await self.handle_message(event)
+```
+
+### 3. Gateway Config (`gateway/config.py`)
+
+Three touchpoints:
+
+1. **`get_connected_platforms()`** — Add a check for your platform's required credentials
+2. **`load_gateway_config()`** — Add token env map entry: `Platform.NEWPLAT: "NEWPLAT_TOKEN"`
+3. **`_apply_env_overrides()`** — Map all `NEWPLAT_*` env vars to config
+
+### 4. Gateway Runner (`gateway/run.py`)
+
+Five touchpoints:
+
+1. **`_create_adapter()`** — Add an `elif platform == Platform.NEWPLAT:` branch
+2. **`_is_user_authorized()` allowed_users map** — `Platform.NEWPLAT: "NEWPLAT_ALLOWED_USERS"`
+3. **`_is_user_authorized()` allow_all map** — `Platform.NEWPLAT: "NEWPLAT_ALLOW_ALL_USERS"`
+4. **Early env check `_any_allowlist` tuple** — Add `"NEWPLAT_ALLOWED_USERS"`
+5. **Early env check `_allow_all` tuple** — Add `"NEWPLAT_ALLOW_ALL_USERS"`
+6. **`_UPDATE_ALLOWED_PLATFORMS` frozenset** — Add `Platform.NEWPLAT`
+
+### 5. Cross-Platform Delivery
+
+1. **`gateway/platforms/webhook.py`** — Add `"newplat"` to the delivery type tuple
+2. **`cron/scheduler.py`** — Add to `_KNOWN_DELIVERY_PLATFORMS` frozenset and `_deliver_result()` platform map
+
+### 6. CLI Integration
+
+1. **`hermes_cli/config.py`** — Add all `NEWPLAT_*` vars to `_EXTRA_ENV_KEYS`
+2. **`hermes_cli/gateway.py`** — Add entry to `_PLATFORMS` list with key, label, emoji, token_var, setup_instructions, and vars
+3. **`hermes_cli/platforms.py`** — Add `PlatformInfo` entry with label and default_toolset (used by `skills_config` and `tools_config` TUIs)
+4. **`hermes_cli/setup.py`** — Add `_setup_newplat()` function (can delegate to `gateway.py`) and add tuple to the messaging platforms list
+5. **`hermes_cli/status.py`** — Add platform detection entry: `"NewPlat": ("NEWPLAT_TOKEN", "NEWPLAT_HOME_CHANNEL")`
+6. **`hermes_cli/dump.py`** — Add `"newplat": "NEWPLAT_TOKEN"` to platform detection dict
+
+### 7. Tools
+
+1. **`tools/send_message_tool.py`** — Add `"newplat": Platform.NEWPLAT` to platform map
+2. **`tools/cronjob_tools.py`** — Add `newplat` to the delivery target description string
+
+### 8. Toolsets
+
+1. **`toolsets.py`** — Add `"hermes-newplat"` toolset definition with `_HERMES_CORE_TOOLS`
+2. **`toolsets.py`** — Add `"hermes-newplat"` to the `"hermes-gateway"` includes list
+
+### 9. Optional: Platform Hints
+
+**`agent/prompt_builder.py`** — If your platform has specific rendering limitations (no markdown, message length limits, etc.), add an entry to the `_PLATFORM_HINTS` dict. This injects platform-specific guidance into the system prompt:
+
+```python
+_PLATFORM_HINTS = {
+    # ...
+    "newplat": (
+        "You are chatting via NewPlat. It supports markdown formatting "
+        "but has a 4000-character message limit."
+    ),
+}
+```
+
+Not all platforms need hints — only add one if the agent's behavior should differ.
+
+### 10. Tests
+
+Create `tests/gateway/test_newplat.py` covering:
+
+- Adapter construction from config
+- Message event building
+- Send method (mock the external API)
+- Platform-specific features (encryption, routing, etc.)
+
+### 11. Documentation
+
+| File | What to add |
+|------|-------------|
+| `website/docs/user-guide/messaging/newplat.md` | Full platform setup page |
+| `website/docs/user-guide/messaging/index.md` | Platform comparison table, architecture diagram, toolsets table, security section, next-steps link |
+| `website/docs/reference/environment-variables.md` | All NEWPLAT_* env vars |
+| `website/docs/reference/toolsets-reference.md` | hermes-newplat toolset |
+| `website/docs/integrations/index.md` | Platform link |
+| `website/sidebars.ts` | Sidebar entry for the docs page |
+| `website/docs/developer-guide/architecture.md` | Adapter count + listing |
+| `website/docs/developer-guide/gateway-internals.md` | Adapter file listing |
+
+## Parity Audit
+
+Before marking a new platform PR as complete, run a parity audit against an established platform:
+
+```bash
+# Find every .py file mentioning the reference platform
+search_files "bluebubbles" output_mode="files_only" file_glob="*.py"
+
+# Find every .py file mentioning the new platform
+search_files "newplat" output_mode="files_only" file_glob="*.py"
+
+# Any file in the first set but not the second is a potential gap
+```
+
+Repeat for `.md` and `.ts` files. Investigate each gap — is it a platform enumeration (needs updating) or a platform-specific reference (skip)?
+
+## Common Patterns
+
+### Long-Poll Adapters
+
+If your adapter uses long-polling (like Telegram or Weixin), use a polling loop task:
+
+```python
+async def connect(self):
+    self._poll_task = asyncio.create_task(self._poll_loop())
+    self._mark_connected()
+
+async def _poll_loop(self):
+    while self._running:
+        messages = await self._fetch_updates()
+        for msg in messages:
+            await self.handle_message(self._build_event(msg))
+```
+
+### Callback/Webhook Adapters
+
+If the platform pushes messages to your endpoint (like WeCom Callback), run an HTTP server:
+
+```python
+async def connect(self):
+    self._app = web.Application()
+    self._app.router.add_post("/callback", self._handle_callback)
+    # ... start aiohttp server
+    self._mark_connected()
+
+async def _handle_callback(self, request):
+    event = self._build_event(await request.text())
+    await self._message_queue.put(event)
+    return web.Response(text="success")  # Acknowledge immediately
+```
+
+For platforms with tight response deadlines (e.g., WeCom's 5-second limit), always acknowledge immediately and deliver the agent's reply proactively via API later. Agent sessions run 3–30 minutes — inline replies within a callback response window are not feasible.
+
+### Token Locks
+
+If the adapter holds a persistent connection with a unique credential, add a scoped lock to prevent two profiles from using the same credential:
+
+```python
+from gateway.status import acquire_scoped_lock, release_scoped_lock
+
+async def connect(self):
+    if not acquire_scoped_lock("newplat", self._token):
+        logger.error("Token already in use by another profile")
+        return False
+    # ... connect
+
+async def disconnect(self):
+    release_scoped_lock("newplat", self._token)
+```
+
+## Reference Implementations
+
+| Adapter | Pattern | Complexity | Good reference for |
+|---------|---------|------------|-------------------|
+| `bluebubbles.py` | REST + webhook | Medium | Simple REST API integration |
+| `weixin.py` | Long-poll + CDN | High | Media handling, encryption |
+| `wecom_callback.py` | Callback/webhook | Medium | HTTP server, AES crypto, multi-app |
+| `telegram.py` | Long-poll + Bot API | High | Full-featured adapter with groups, threads |
diff --git a/website/docs/integrations/index.md b/website/docs/integrations/index.md
index 6dccc44e9..cfc82d41d 100644
--- a/website/docs/integrations/index.md
+++ b/website/docs/integrations/index.md
@@ -82,7 +82,7 @@ Speech-to-text supports three providers: local Whisper (free, runs on-device), G
 
 Hermes runs as a gateway bot on 15+ messaging platforms, all configured through the same `gateway` subsystem:
 
-- **[Telegram](/docs/user-guide/messaging/telegram)**, **[Discord](/docs/user-guide/messaging/discord)**, **[Slack](/docs/user-guide/messaging/slack)**, **[WhatsApp](/docs/user-guide/messaging/whatsapp)**, **[Signal](/docs/user-guide/messaging/signal)**, **[Matrix](/docs/user-guide/messaging/matrix)**, **[Mattermost](/docs/user-guide/messaging/mattermost)**, **[Email](/docs/user-guide/messaging/email)**, **[SMS](/docs/user-guide/messaging/sms)**, **[DingTalk](/docs/user-guide/messaging/dingtalk)**, **[Feishu/Lark](/docs/user-guide/messaging/feishu)**, **[WeCom](/docs/user-guide/messaging/wecom)**, **[Weixin](/docs/user-guide/messaging/weixin)**, **[BlueBubbles](/docs/user-guide/messaging/bluebubbles)**, **[Home Assistant](/docs/user-guide/messaging/homeassistant)**, **[Webhooks](/docs/user-guide/messaging/webhooks)**
+- **[Telegram](/docs/user-guide/messaging/telegram)**, **[Discord](/docs/user-guide/messaging/discord)**, **[Slack](/docs/user-guide/messaging/slack)**, **[WhatsApp](/docs/user-guide/messaging/whatsapp)**, **[Signal](/docs/user-guide/messaging/signal)**, **[Matrix](/docs/user-guide/messaging/matrix)**, **[Mattermost](/docs/user-guide/messaging/mattermost)**, **[Email](/docs/user-guide/messaging/email)**, **[SMS](/docs/user-guide/messaging/sms)**, **[DingTalk](/docs/user-guide/messaging/dingtalk)**, **[Feishu/Lark](/docs/user-guide/messaging/feishu)**, **[WeCom](/docs/user-guide/messaging/wecom)**, **[WeCom Callback](/docs/user-guide/messaging/wecom-callback)**, **[Weixin](/docs/user-guide/messaging/weixin)**, **[BlueBubbles](/docs/user-guide/messaging/bluebubbles)**, **[Home Assistant](/docs/user-guide/messaging/homeassistant)**, **[Webhooks](/docs/user-guide/messaging/webhooks)**
 
 See the [Messaging Gateway overview](/docs/user-guide/messaging) for the platform comparison table and setup guide.
 
diff --git a/website/docs/reference/environment-variables.md b/website/docs/reference/environment-variables.md
index a548a6ff6..bec5ff1c3 100644
--- a/website/docs/reference/environment-variables.md
+++ b/website/docs/reference/environment-variables.md
@@ -232,6 +232,15 @@ For cloud sandbox backends, persistence is filesystem-oriented. `TERMINAL_LIFETI
 | `WECOM_WEBSOCKET_URL` | Custom WebSocket URL (default: `wss://openws.work.weixin.qq.com`) |
 | `WECOM_ALLOWED_USERS` | Comma-separated WeCom user IDs allowed to message the bot |
 | `WECOM_HOME_CHANNEL` | WeCom chat ID for cron delivery and notifications |
+| `WECOM_CALLBACK_CORP_ID` | WeCom enterprise Corp ID for callback self-built app |
+| `WECOM_CALLBACK_CORP_SECRET` | Corp secret for the self-built app |
+| `WECOM_CALLBACK_AGENT_ID` | Agent ID of the self-built app |
+| `WECOM_CALLBACK_TOKEN` | Callback verification token |
+| `WECOM_CALLBACK_ENCODING_AES_KEY` | AES key for callback encryption |
+| `WECOM_CALLBACK_HOST` | Callback server bind address (default: `0.0.0.0`) |
+| `WECOM_CALLBACK_PORT` | Callback server port (default: `8645`) |
+| `WECOM_CALLBACK_ALLOWED_USERS` | Comma-separated user IDs for allowlist |
+| `WECOM_CALLBACK_ALLOW_ALL_USERS` | Set `true` to allow all users without an allowlist |
 | `WEIXIN_ACCOUNT_ID` | Weixin account ID obtained via QR login through iLink Bot API |
 | `WEIXIN_TOKEN` | Weixin authentication token obtained via QR login through iLink Bot API |
 | `WEIXIN_BASE_URL` | Override Weixin iLink Bot API base URL (default: `https://ilinkai.weixin.qq.com`) |
diff --git a/website/docs/reference/toolsets-reference.md b/website/docs/reference/toolsets-reference.md
index 5516cfdfa..96856552e 100644
--- a/website/docs/reference/toolsets-reference.md
+++ b/website/docs/reference/toolsets-reference.md
@@ -103,6 +103,7 @@ Platform toolsets define the complete tool configuration for a deployment target
 | `hermes-dingtalk` | Same as `hermes-cli`. |
 | `hermes-feishu` | Same as `hermes-cli`. |
 | `hermes-wecom` | Same as `hermes-cli`. |
+| `hermes-wecom-callback` | WeCom callback toolset — enterprise self-built app messaging (full access). |
 | `hermes-weixin` | Same as `hermes-cli`. |
 | `hermes-bluebubbles` | Same as `hermes-cli`. |
 | `hermes-homeassistant` | Same as `hermes-cli`. |
diff --git a/website/docs/user-guide/messaging/index.md b/website/docs/user-guide/messaging/index.md
index 41b031437..f4131385e 100644
--- a/website/docs/user-guide/messaging/index.md
+++ b/website/docs/user-guide/messaging/index.md
@@ -27,6 +27,7 @@ For the full voice feature set — including CLI microphone mode, spoken replies
 | DingTalk | — | — | — | — | — | ✅ | ✅ |
 | Feishu/Lark | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ | ✅ |
 | WeCom | ✅ | ✅ | ✅ | — | — | ✅ | ✅ |
+| WeCom Callback | — | — | — | — | — | — | — |
 | Weixin | ✅ | ✅ | ✅ | — | — | ✅ | ✅ |
 | BlueBubbles | — | ✅ | ✅ | — | ✅ | ✅ | — |
 
@@ -51,6 +52,7 @@ flowchart TB
             dt[DingTalk]
     fs[Feishu/Lark]
     wc[WeCom]
+    wcb[WeCom Callback]
     wx[Weixin]
     bb[BlueBubbles]
             api["API Server<br/>(OpenAI-compatible)"]
@@ -75,6 +77,7 @@ flowchart TB
     dt --> store
     fs --> store
     wc --> store
+    wcb --> store
     wx --> store
     bb --> store
     api --> store
@@ -180,6 +183,7 @@ MATRIX_ALLOWED_USERS=@alice:matrix.org
 DINGTALK_ALLOWED_USERS=user-id-1
 FEISHU_ALLOWED_USERS=ou_xxxxxxxx,ou_yyyyyyyy
 WECOM_ALLOWED_USERS=user-id-1,user-id-2
+WECOM_CALLBACK_ALLOWED_USERS=user-id-1,user-id-2
 
 # Or allow
 GATEWAY_ALLOWED_USERS=123456789,987654321
@@ -362,6 +366,7 @@ Each platform has its own toolset:
 | DingTalk | `hermes-dingtalk` | Full tools including terminal |
 | Feishu/Lark | `hermes-feishu` | Full tools including terminal |
 | WeCom | `hermes-wecom` | Full tools including terminal |
+| WeCom Callback | `hermes-wecom-callback` | Full tools including terminal |
 | Weixin | `hermes-weixin` | Full tools including terminal |
 | BlueBubbles | `hermes-bluebubbles` | Full tools including terminal |
 | API Server | `hermes` (default) | Full tools including terminal |
@@ -382,6 +387,7 @@ Each platform has its own toolset:
 - [DingTalk Setup](dingtalk.md)
 - [Feishu/Lark Setup](feishu.md)
 - [WeCom Setup](wecom.md)
+- [WeCom Callback Setup](wecom-callback.md)
 - [Weixin Setup (WeChat)](weixin.md)
 - [BlueBubbles Setup (iMessage)](bluebubbles.md)
 - [Open WebUI + API Server](open-webui.md)
diff --git a/website/docs/user-guide/messaging/wecom-callback.md b/website/docs/user-guide/messaging/wecom-callback.md
new file mode 100644
index 000000000..466294276
--- /dev/null
+++ b/website/docs/user-guide/messaging/wecom-callback.md
@@ -0,0 +1,147 @@
+---
+sidebar_position: 15
+---
+
+# WeCom Callback (Self-Built App)
+
+Connect Hermes to WeCom (Enterprise WeChat) as a self-built enterprise application using the callback/webhook model.
+
+:::info WeCom Bot vs WeCom Callback
+Hermes supports two WeCom integration modes:
+- **[WeCom Bot](wecom.md)** — bot-style, connects via WebSocket. Simpler setup, works in group chats.
+- **WeCom Callback** (this page) — self-built app, receives encrypted XML callbacks. Shows as a first-class app in users' WeCom sidebar. Supports multi-corp routing.
+:::
+
+## How It Works
+
+1. You register a self-built application in the WeCom Admin Console
+2. WeCom pushes encrypted XML to your HTTP callback endpoint
+3. Hermes decrypts the message, queues it for the agent
+4. Immediately acknowledges (silent — nothing displayed to the user)
+5. The agent processes the request (typically 3–30 minutes)
+6. The reply is delivered proactively via the WeCom `message/send` API
+
+## Prerequisites
+
+- A WeCom enterprise account with admin access
+- `aiohttp` and `httpx` Python packages (included in the default install)
+- A publicly reachable server for the callback URL (or a tunnel like ngrok)
+
+## Setup
+
+### 1. Create a Self-Built App in WeCom
+
+1. Go to [WeCom Admin Console](https://work.weixin.qq.com/) → **Applications** → **Create App**
+2. Note your **Corp ID** (shown at the top of the admin console)
+3. In the app settings, create a **Corp Secret**
+4. Note the **Agent ID** from the app's overview page
+5. Under **Receive Messages**, configure the callback URL:
+   - URL: `http://YOUR_PUBLIC_IP:8645/wecom/callback`
+   - Token: Generate a random token (WeCom provides one)
+   - EncodingAESKey: Generate a key (WeCom provides one)
+
+### 2. Configure Environment Variables
+
+Add to your `.env` file:
+
+```bash
+WECOM_CALLBACK_CORP_ID=your-corp-id
+WECOM_CALLBACK_CORP_SECRET=your-corp-secret
+WECOM_CALLBACK_AGENT_ID=1000002
+WECOM_CALLBACK_TOKEN=your-callback-token
+WECOM_CALLBACK_ENCODING_AES_KEY=your-43-char-aes-key
+
+# Optional
+WECOM_CALLBACK_HOST=0.0.0.0
+WECOM_CALLBACK_PORT=8645
+WECOM_CALLBACK_ALLOWED_USERS=user1,user2
+```
+
+### 3. Start the Gateway
+
+```bash
+hermes gateway start
+```
+
+The callback adapter starts an HTTP server on the configured port. WeCom will verify the callback URL via a GET request, then begin sending messages via POST.
+
+## Configuration Reference
+
+Set these in `config.yaml` under `platforms.wecom_callback.extra`, or use environment variables:
+
+| Setting | Default | Description |
+|---------|---------|-------------|
+| `corp_id` | — | WeCom enterprise Corp ID (required) |
+| `corp_secret` | — | Corp secret for the self-built app (required) |
+| `agent_id` | — | Agent ID of the self-built app (required) |
+| `token` | — | Callback verification token (required) |
+| `encoding_aes_key` | — | 43-character AES key for callback encryption (required) |
+| `host` | `0.0.0.0` | Bind address for the HTTP callback server |
+| `port` | `8645` | Port for the HTTP callback server |
+| `path` | `/wecom/callback` | URL path for the callback endpoint |
+
+## Multi-App Routing
+
+For enterprises running multiple self-built apps (e.g., across different departments or subsidiaries), configure the `apps` list in `config.yaml`:
+
+```yaml
+platforms:
+  wecom_callback:
+    enabled: true
+    extra:
+      host: "0.0.0.0"
+      port: 8645
+      apps:
+        - name: "dept-a"
+          corp_id: "ww_corp_a"
+          corp_secret: "secret-a"
+          agent_id: "1000002"
+          token: "token-a"
+          encoding_aes_key: "key-a-43-chars..."
+        - name: "dept-b"
+          corp_id: "ww_corp_b"
+          corp_secret: "secret-b"
+          agent_id: "1000003"
+          token: "token-b"
+          encoding_aes_key: "key-b-43-chars..."
+```
+
+Users are scoped by `corp_id:user_id` to prevent cross-corp collisions. When a user sends a message, the adapter records which app (corp) they belong to and routes replies through the correct app's access token.
+
+## Access Control
+
+Restrict which users can interact with the app:
+
+```bash
+# Allowlist specific users
+WECOM_CALLBACK_ALLOWED_USERS=zhangsan,lisi,wangwu
+
+# Or allow all users
+WECOM_CALLBACK_ALLOW_ALL_USERS=true
+```
+
+## Endpoints
+
+The adapter exposes:
+
+| Method | Path | Purpose |
+|--------|------|---------|
+| GET | `/wecom/callback` | URL verification handshake (WeCom sends this during setup) |
+| POST | `/wecom/callback` | Encrypted message callback (WeCom sends user messages here) |
+| GET | `/health` | Health check — returns `{"status": "ok"}` |
+
+## Encryption
+
+All callback payloads are encrypted with AES-CBC using the EncodingAESKey. The adapter handles:
+
+- **Inbound**: Decrypt XML payload, verify SHA1 signature
+- **Outbound**: Replies sent via proactive API (not encrypted callback response)
+
+The crypto implementation is compatible with Tencent's official WXBizMsgCrypt SDK.
+
+## Limitations
+
+- **No streaming** — replies arrive as complete messages after the agent finishes
+- **No typing indicators** — the callback model doesn't support typing status
+- **Text only** — currently supports text messages; image/file/voice not yet implemented
+- **Response latency** — agent sessions take 3–30 minutes; users see the reply when processing completes
diff --git a/website/sidebars.ts b/website/sidebars.ts
index 52fd589c7..973cfe89c 100644
--- a/website/sidebars.ts
+++ b/website/sidebars.ts
@@ -108,6 +108,7 @@ const sidebars: SidebarsConfig = {
         'user-guide/messaging/dingtalk',
         'user-guide/messaging/feishu',
         'user-guide/messaging/wecom',
+        'user-guide/messaging/wecom-callback',
         'user-guide/messaging/weixin',
         'user-guide/messaging/bluebubbles',
         'user-guide/messaging/open-webui',
@@ -175,6 +176,7 @@ const sidebars: SidebarsConfig = {
           items: [
             'developer-guide/adding-tools',
             'developer-guide/adding-providers',
+            'developer-guide/adding-platform-adapters',
             'developer-guide/memory-provider-plugin',
             'developer-guide/context-engine-plugin',
             'developer-guide/creating-skills',