diff --git a/nanobot/agent/loop.py b/nanobot/agent/loop.py
index bfe6e89..ac24016 100644
--- a/nanobot/agent/loop.py
+++ b/nanobot/agent/loop.py
@@ -220,7 +220,8 @@ class AgentLoop:
         return OutboundMessage(
             channel=msg.channel,
             chat_id=msg.chat_id,
-            content=final_content
+            content=final_content,
+            metadata=msg.metadata or {},
         )
     
     async def _process_system_message(self, msg: InboundMessage) -> OutboundMessage | None:
diff --git a/nanobot/channels/manager.py b/nanobot/channels/manager.py
index 73c3334..d49d3b1 100644
--- a/nanobot/channels/manager.py
+++ b/nanobot/channels/manager.py
@@ -55,6 +55,17 @@ class ChannelManager:
                 logger.info("WhatsApp channel enabled")
             except ImportError as e:
                 logger.warning(f"WhatsApp channel not available: {e}")
+
+        # Slack channel
+        if self.config.channels.slack.enabled:
+            try:
+                from nanobot.channels.slack import SlackChannel
+                self.channels["slack"] = SlackChannel(
+                    self.config.channels.slack, self.bus
+                )
+                logger.info("Slack channel enabled")
+            except ImportError as e:
+                logger.warning(f"Slack channel not available: {e}")
     
     async def start_all(self) -> None:
         """Start WhatsApp channel and the outbound dispatcher."""
diff --git a/nanobot/channels/slack.py b/nanobot/channels/slack.py
new file mode 100644
index 0000000..32abe3b
--- /dev/null
+++ b/nanobot/channels/slack.py
@@ -0,0 +1,205 @@
+"""Slack channel implementation using Socket Mode."""
+
+import asyncio
+import re
+from typing import Any
+
+from loguru import logger
+from slack_sdk.socket_mode.aiohttp 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
+
+from nanobot.bus.events import OutboundMessage
+from nanobot.bus.queue import MessageBus
+from nanobot.channels.base import BaseChannel
+from nanobot.config.schema import SlackConfig
+
+
+class SlackChannel(BaseChannel):
+    """Slack channel using Socket Mode."""
+
+    name = "slack"
+
+    def __init__(self, config: SlackConfig, bus: MessageBus):
+        super().__init__(config, bus)
+        self.config: SlackConfig = config
+        self._web_client: AsyncWebClient | None = None
+        self._socket_client: SocketModeClient | None = None
+        self._bot_user_id: str | None = None
+
+    async def start(self) -> None:
+        """Start the Slack Socket Mode client."""
+        if not self.config.bot_token or not self.config.app_token:
+            logger.error("Slack bot/app token not configured")
+            return
+        if self.config.mode != "socket":
+            logger.error(f"Unsupported Slack mode: {self.config.mode}")
+            return
+
+        self._running = True
+
+        self._web_client = AsyncWebClient(token=self.config.bot_token)
+        self._socket_client = SocketModeClient(
+            app_token=self.config.app_token,
+            web_client=self._web_client,
+        )
+
+        self._socket_client.socket_mode_request_listeners.append(self._on_socket_request)
+
+        # Resolve bot user ID for mention handling
+        try:
+            auth = await self._web_client.auth_test()
+            self._bot_user_id = auth.get("user_id")
+            logger.info(f"Slack bot connected as {self._bot_user_id}")
+        except Exception as e:
+            logger.warning(f"Slack auth_test failed: {e}")
+
+        logger.info("Starting Slack Socket Mode client...")
+        await self._socket_client.connect()
+
+        while self._running:
+            await asyncio.sleep(1)
+
+    async def stop(self) -> None:
+        """Stop the Slack client."""
+        self._running = False
+        if self._socket_client:
+            try:
+                await self._socket_client.close()
+            except Exception as e:
+                logger.warning(f"Slack socket close failed: {e}")
+            self._socket_client = None
+
+    async def send(self, msg: OutboundMessage) -> None:
+        """Send a message through Slack."""
+        if not self._web_client:
+            logger.warning("Slack client not running")
+            return
+        try:
+            slack_meta = msg.metadata.get("slack", {}) if msg.metadata else {}
+            thread_ts = slack_meta.get("thread_ts")
+            channel_type = slack_meta.get("channel_type")
+            # Only reply in thread for channel/group messages; DMs don't use threads
+            use_thread = thread_ts and channel_type != "im"
+            await self._web_client.chat_postMessage(
+                channel=msg.chat_id,
+                text=msg.content or "",
+                thread_ts=thread_ts if use_thread else None,
+            )
+        except Exception as e:
+            logger.error(f"Error sending Slack message: {e}")
+
+    async def _on_socket_request(
+        self,
+        client: SocketModeClient,
+        req: SocketModeRequest,
+    ) -> None:
+        """Handle incoming Socket Mode requests."""
+        if req.type != "events_api":
+            return
+
+        # Acknowledge right away
+        await client.send_socket_mode_response(
+            SocketModeResponse(envelope_id=req.envelope_id)
+        )
+
+        payload = req.payload or {}
+        event = payload.get("event") or {}
+        event_type = event.get("type")
+
+        # Handle app mentions or plain messages
+        if event_type not in ("message", "app_mention"):
+            return
+
+        sender_id = event.get("user")
+        chat_id = event.get("channel")
+
+        # Ignore bot/system messages to prevent loops
+        if event.get("subtype") == "bot_message" or event.get("subtype"):
+            return
+        if self._bot_user_id and sender_id == self._bot_user_id:
+            return
+
+        # Avoid double-processing: Slack sends both `message` and `app_mention`
+        # for mentions in channels. Prefer `app_mention`.
+        text = event.get("text") or ""
+        if event_type == "message" and self._bot_user_id and f"<@{self._bot_user_id}>" in text:
+            return
+
+        # Debug: log basic event shape
+        logger.debug(
+            "Slack event: type={} subtype={} user={} channel={} channel_type={} text={}",
+            event_type,
+            event.get("subtype"),
+            sender_id,
+            chat_id,
+            event.get("channel_type"),
+            text[:80],
+        )
+        if not sender_id or not chat_id:
+            return
+
+        channel_type = event.get("channel_type") or ""
+
+        if not self._is_allowed(sender_id, chat_id, channel_type):
+            return
+
+        if channel_type != "im" and not self._should_respond_in_channel(event_type, text, chat_id):
+            return
+
+        text = self._strip_bot_mention(text)
+
+        thread_ts = event.get("thread_ts") or event.get("ts")
+        # Add :eyes: reaction to the triggering message (best-effort)
+        try:
+            if self._web_client and event.get("ts"):
+                await self._web_client.reactions_add(
+                    channel=chat_id,
+                    name="eyes",
+                    timestamp=event.get("ts"),
+                )
+        except Exception as e:
+            logger.debug(f"Slack reactions_add failed: {e}")
+
+        await self._handle_message(
+            sender_id=sender_id,
+            chat_id=chat_id,
+            content=text,
+            metadata={
+                "slack": {
+                    "event": event,
+                    "thread_ts": thread_ts,
+                    "channel_type": channel_type,
+                }
+            },
+        )
+
+    def _is_allowed(self, sender_id: str, chat_id: str, channel_type: str) -> bool:
+        if channel_type == "im":
+            if not self.config.dm.enabled:
+                return False
+            if self.config.dm.policy == "allowlist":
+                return sender_id in self.config.dm.allow_from
+            return True
+
+        # Group / channel messages
+        if self.config.group_policy == "allowlist":
+            return chat_id in self.config.group_allow_from
+        return True
+
+    def _should_respond_in_channel(self, event_type: str, text: str, chat_id: str) -> bool:
+        if self.config.group_policy == "open":
+            return True
+        if self.config.group_policy == "mention":
+            if event_type == "app_mention":
+                return True
+            return self._bot_user_id is not None and f"<@{self._bot_user_id}>" in text
+        if self.config.group_policy == "allowlist":
+            return chat_id in self.config.group_allow_from
+        return False
+
+    def _strip_bot_mention(self, text: str) -> str:
+        if not text or not self._bot_user_id:
+            return text
+        return re.sub(rf"<@{re.escape(self._bot_user_id)}>\s*", "", text).strip()
diff --git a/nanobot/cli/commands.py b/nanobot/cli/commands.py
index c2241fb..1dd91a9 100644
--- a/nanobot/cli/commands.py
+++ b/nanobot/cli/commands.py
@@ -379,6 +379,15 @@ def channels_status():
         tg_config
     )
 
+    # Slack
+    slack = config.channels.slack
+    slack_config = "socket" if slack.app_token and slack.bot_token else "[dim]not configured[/dim]"
+    table.add_row(
+        "Slack",
+        "✓" if slack.enabled else "✗",
+        slack_config
+    )
+
     console.print(table)
 
 
diff --git a/nanobot/config/schema.py b/nanobot/config/schema.py
index 4c34834..3575454 100644
--- a/nanobot/config/schema.py
+++ b/nanobot/config/schema.py
@@ -19,10 +19,31 @@ class TelegramConfig(BaseModel):
     allow_from: list[str] = Field(default_factory=list)  # Allowed user IDs or usernames
 
 
+class SlackDMConfig(BaseModel):
+    """Slack DM policy configuration."""
+    enabled: bool = True
+    policy: str = "open"  # "open" or "allowlist"
+    allow_from: list[str] = Field(default_factory=list)  # Allowed Slack user IDs
+
+
+class SlackConfig(BaseModel):
+    """Slack channel configuration."""
+    enabled: bool = False
+    mode: str = "socket"  # "socket" supported
+    webhook_path: str = "/slack/events"
+    bot_token: str = ""  # xoxb-...
+    app_token: str = ""  # xapp-...
+    user_token_read_only: bool = True
+    group_policy: str = "open"  # "open", "mention", "allowlist"
+    group_allow_from: list[str] = Field(default_factory=list)  # Allowed channel IDs if allowlist
+    dm: SlackDMConfig = Field(default_factory=SlackDMConfig)
+
+
 class ChannelsConfig(BaseModel):
     """Configuration for chat channels."""
     whatsapp: WhatsAppConfig = Field(default_factory=WhatsAppConfig)
     telegram: TelegramConfig = Field(default_factory=TelegramConfig)
+    slack: SlackConfig = Field(default_factory=SlackConfig)
 
 
 class AgentDefaults(BaseModel):
diff --git a/pyproject.toml b/pyproject.toml
index d578a08..5d4dec9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -29,6 +29,7 @@ dependencies = [
     "rich>=13.0.0",
     "croniter>=2.0.0",
     "python-telegram-bot>=21.0",
+    "slack-sdk>=3.26.0",
 ]
 
 [project.optional-dependencies]