@everyone and @here mentions being abused
I ran into an abuse issue where players discovered they can ping @everyone and @here from the game. Each time it pinged over 7000 discord members. This caused quite a stir, can you look into options for filtering these?
Disable your bot from being able to ping everyone, it's a Discord function.
I use a single role to manage my discord bots, but disablibng that feature in the role disables it for all bots in the role. Can you please consider adding a filter for this plugin?
Regardless of the bot's permissions, it's probably advisable to have at least some configuration option (even if it's just some boolean that allows/denies mentions) to specify the "allowed_mentions" field when sending a chat message to a Discord channel.

See here for implementation details: https://github.com/discord/discord-api-docs/pull/1396

I was looking for a public repo for this plugin to send a PR to but I can't find one.

Merged post

After some further digging, it appears the "Oxide.Ext.Discord" plugin had no support for the "allowed_mentions" field. 

I PR'd a change to that plugin to support it: https://github.com/Trickyyy/Oxide.Ext.Discord/pull/13

And, for reference, here's a changeset for *this* plugin that would use this new feature to suppress all mentions sent by this plugin by default (I didn't add configuration options or anything): https://github.com/SpencerSharkey/rustcord/pull/1
Put @everyone in filtered words list?
Then players could just make their steam name @everyone, or a role/user mention string, and continue to ping everyone in the guild. 
SpencerSharkey
Then players could just make their steam name @everyone, or a role/user mention string, and continue to ping everyone in the guild.
Agreed, this is a much better method than filtered only. I'll test this soon and report back the results. 

Merged post

This is working with both of Spencer's modified files. Thanks!

Prevent @Discord#3821 tags from being sent to the game server.

It appears in the game like @<:2378968976234234> And other extra nonsense,

I would suggest that it would show the persons name instead of the tag.