Utility
Auto-Responder
A trigger-and-reply rule: when a message matches a keyword or pattern, the bot posts a set response. Used for FAQs, support deflection and in-jokes.
An auto-responder answering the five questions your support channel gets daily removes more staff load than most dedicated support tooling.
The failure mode is over-triggering. A rule matching a common substring will fire inside unrelated words, so match on whole words and test against real channel history.