diff --git a/gateway/platforms/discord.py b/gateway/platforms/discord.py
index 660ed46dd..2b45b2b58 100644
--- a/gateway/platforms/discord.py
+++ b/gateway/platforms/discord.py
@@ -2962,6 +2962,17 @@ class DiscordAdapter(BasePlatformAdapter):
             parent_channel_id = self._get_parent_channel_id(message.channel)
 
         is_voice_linked_channel = False
+
+        # Save mention-stripped text before auto-threading since create_thread()
+        # can clobber message.content, breaking /command detection in channels.
+        raw_content = message.content.strip()
+        normalized_content = raw_content
+        mention_prefix = False
+        if self._client.user and self._client.user in message.mentions:
+            mention_prefix = True
+            normalized_content = normalized_content.replace(f"<@{self._client.user.id}>", "").strip()
+            normalized_content = normalized_content.replace(f"<@!{self._client.user.id}>", "").strip()
+            message.content = normalized_content
         if not isinstance(message.channel, discord.DMChannel):
             channel_ids = {str(message.channel.id)}
             if parent_channel_id:
@@ -2999,13 +3010,8 @@ class DiscordAdapter(BasePlatformAdapter):
             in_bot_thread = is_thread and thread_id in self._threads
 
             if require_mention and not is_free_channel and not in_bot_thread:
-                if self._client.user not in message.mentions:
+                if self._client.user not in message.mentions and not mention_prefix:
                     return
-
-            if self._client.user and self._client.user in message.mentions:
-                message.content = message.content.replace(f"<@{self._client.user.id}>", "").strip()
-                message.content = message.content.replace(f"<@!{self._client.user.id}>", "").strip()
-
         # Auto-thread: when enabled, automatically create a thread for every
         # @mention in a text channel so each conversation is isolated (like Slack).
         # Messages already inside threads or DMs are unaffected.
@@ -3027,7 +3033,7 @@ class DiscordAdapter(BasePlatformAdapter):
 
         # Determine message type
         msg_type = MessageType.TEXT
-        if message.content.startswith("/"):
+        if normalized_content.startswith("/"):
             msg_type = MessageType.COMMAND
         elif message.attachments:
             # Check attachment types
@@ -3167,7 +3173,9 @@ class DiscordAdapter(BasePlatformAdapter):
                                 att.filename, e, exc_info=True,
                             )
 
-        event_text = message.content
+        # Use normalized_content (saved before auto-threading) instead of message.content,
+        # to detect /slash commands in channel messages.
+        event_text = normalized_content
         if pending_text_injection:
             event_text = f"{pending_text_injection}\n\n{event_text}" if event_text else pending_text_injection