on-message-event tag

bot/resources/tags/on-message-event.md

@@ -0,0 +1,22 @@
+---
+embed:
+    title: "The discord.py `on_message` event"
+---
+
+Registering the `on_message` event with [`@bot.event`](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.ext.commands.Bot.event) will override the default behavior of the event. This may cause prefix commands to stop working, because they rely on the default `on_message` event handler.
+
+Instead, use [`@bot.listen`](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.ext.commands.Bot.listen) to add a listener. Listeners get added alongside the default `on_message` handler which allows you to have multiple handlers for the same event. This means prefix commands can still be invoked as usual. Here's an example:
+```python
+@bot.listen()
+async def on_message(message):
+    ...  # do stuff here
+
+# Or...
+
+@bot.listen('on_message')
+async def message_listener(message):
+    ...  # do stuff here
+```
+You can also tell discord.py to process the message for commands as usual at the end of the `on_message` handler with [`bot.process_commands()`](https://discordpy.readthedocs.io/en/stable/ext/commands/api.html#discord.ext.commands.Bot.process_commands). However, this method isn't recommended as it does not allow you to add multiple `on_message` handlers.
+
+If your prefix commands are still not working, it may be because you haven't enabled the `message_content` intent. See `/tag message_content` for more info.