The idea is I'd be able to write another mod that would tell BlockBot what features it supports (IE, skins for avatars, embeds, etc.) and then configure BlockBot to use that backend instead of the built-in Discord one. This could be used for writing Slack, IRC, etc. bridges without having to modify BlockBot itself or write a mod from scratch.

This should be implemented in c4e5347, let me know if you have any feedback for that change

I like how this is going! I would maybe have a section in the config file with a list of the built-in bot types, and options to enable or disable them. They'd then have their own configuration in a subfolder. Discord bot would be the only one enabled by default. It might also be helpful to have commands to list the registered bots, as well as a console-only command to delete the configuration files for unused bots, in case a server ends up having a lot of them. It's a dangerous command, so should be permission level 4 (same as /stop is)

So I don't plan on official support for other platforms, but if anyone else wants to use the API, feel free

I guess that means only discord bot would be listed by default
Sections for the other bots registered at launch should probably be added so they can be enabled or disabled.

They can - in the BlockBot class bots can be registered. The idea is the mod handles config loading as they control the logic for the bot

Fair enough.