fix: use websockets backend, simplify subtype check, add Slack docs

README.md

@@ -166,7 +166,7 @@ nanobot agent -m "Hello from my local LLM!"
 
 ## 💬 Chat Apps
 
-Talk to your nanobot through Telegram, Discord, WhatsApp, Feishu, DingTalk, or Email — anytime, anywhere.
+Talk to your nanobot through Telegram, Discord, WhatsApp, Feishu, DingTalk, Slack, or Email — anytime, anywhere.
 
 | Channel | Setup |
 |---------|-------|
@@ -175,6 +175,7 @@ Talk to your nanobot through Telegram, Discord, WhatsApp, Feishu, DingTalk, or E
 | **WhatsApp** | Medium (scan QR) |
 | **Feishu** | Medium (app credentials) |
 | **DingTalk** | Medium (app credentials) |
+| **Slack** | Medium (bot + app tokens) |
 | **Email** | Medium (IMAP/SMTP credentials) |
 
 <details>
@@ -374,6 +375,44 @@ nanobot gateway
 
 </details>
 
+<details>
+<summary><b>Slack</b></summary>
+
+Uses **Socket Mode** — no public URL required.
+
+**1. Create a Slack app**
+- Go to [Slack API](https://api.slack.com/apps) → Create New App
+- **OAuth & Permissions**: Add bot scopes: `chat:write`, `reactions:write`, `app_mentions:read`
+- Install to your workspace and copy the **Bot Token** (`xoxb-...`)
+- **Socket Mode**: Enable it and generate an **App-Level Token** (`xapp-...`) with `connections:write` scope
+- **Event Subscriptions**: Subscribe to `message.im`, `message.channels`, `app_mention`
+
+**2. Configure**
+
+```json
+{
+  "channels": {
+    "slack": {
+      "enabled": true,
+      "botToken": "xoxb-...",
+      "appToken": "xapp-...",
+      "groupPolicy": "mention"
+    }
+  }
+}
+```
+
+> `groupPolicy`: `"mention"` (respond only when @mentioned), `"open"` (respond to all messages), or `"allowlist"` (restrict to specific channels).
+> DM policy defaults to open. Set `"dm": {"enabled": false}` to disable DMs.
+
+**3. Run**
+
+```bash
+nanobot gateway
+```
+
+</details>
+
 <details>
 <summary><b>Email</b></summary>
 
@@ -592,7 +631,7 @@ PRs welcome! The codebase is intentionally small and readable. 🤗
 - [ ] **Multi-modal** — See and hear (images, voice, video)
 - [ ] **Long-term memory** — Never forget important context
 - [ ] **Better reasoning** — Multi-step planning and reflection
-- [ ] **More integrations** — Slack, calendar, and more
+- [ ] **More integrations** — Calendar and more
 - [ ] **Self-improvement** — Learn from feedback and mistakes
 
 ### Contributors

nanobot/agent/loop.py

@@ -246,7 +246,7 @@ class AgentLoop:
             channel=msg.channel,
             chat_id=msg.chat_id,
             content=final_content,
-            metadata=msg.metadata or {},
+            metadata=msg.metadata or {},  # Pass through for channel-specific needs (e.g. Slack thread_ts)
         )
     
     async def _process_system_message(self, msg: InboundMessage) -> OutboundMessage | None:

nanobot/channels/slack.py

@@ -5,7 +5,7 @@ import re
 from typing import Any
 
 from loguru import logger
-from slack_sdk.socket_mode.aiohttp import SocketModeClient
+from slack_sdk.socket_mode.websockets import SocketModeClient
 from slack_sdk.socket_mode.request import SocketModeRequest
 from slack_sdk.socket_mode.response import SocketModeResponse
 from slack_sdk.web.async_client import AsyncWebClient
@@ -115,8 +115,8 @@ class SlackChannel(BaseChannel):
         sender_id = event.get("user")
         chat_id = event.get("channel")
 
-        # Ignore bot/system messages to prevent loops
+        # Ignore bot/system messages (any subtype = not a normal user message)
-        if event.get("subtype") == "bot_message" or event.get("subtype"):
+        if event.get("subtype"):
             return
         if self._bot_user_id and sender_id == self._bot_user_id:
             return