standardMessages

Sets standard messages as the bot trigger. For standard messages:

• ALL: The bot processes all standard messages.

• AUTO: The bot responds to ALL messages when the channel has one other non-hidden member, and responds to MENTIONS when the channel has more than one other non-hidden member.

• MENTIONS: The bot processes all standard messages that have a message attribute with CHIME.mentions and a value of the bot ARN.

• NONE: The bot processes no standard messages.