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Four small features that change how a specific channel behaves.

Autothreads

Create a thread on every message in a channel. Turns a feed-style channel into something you can actually discuss.
Requires Manage Threads. Aliases: autothreads, threadify, athread.
Supports variables. !autothread variables lists what’s available. You can also pass a name when adding:
Sent automatically in every created thread. Remove with !autothread message remove #showcase.
Reacts to the original message, not the thread. Saves everyone the ritual first reaction.
Archive duration is in minutes — 60, 1440 (a day), 4320 (three days) or 10080 (a week). Slowmode is in seconds.
To stop a specific thread being auto-archived by Discord, that’s !thread add — see Channels & threads.
Only allow messages with attachments. Anything without one gets deleted.
Requires Manage Messages. Alias: imgonly.
A gallery channel plus autothreads is the standard art-channel setup: images only in the channel, all discussion in threads.

Command-only channels

The opposite of a gallery: only allow commands. Everything else is deleted.
Requires Manage Messages. Aliases: cmdonly, commandsonly. By default mira recognises the prefixes other bots commonly use and leaves those messages alone. To tighten or loosen that:

Auto-publishing

Automatically publish messages posted in announcement channels, so they reach every server that follows yours.
Requires Manage Messages. Alias: announcement.
Discord limits announcement channels to 10 published messages per hour. Past that, publishing silently fails until the window resets — so don’t point this at a busy channel.

Command reference