slack.onAppMention emits messages that directly mention the installed bot.
Example
automations/answer-slack-mention.automation.ts
Options
Trigger data
Returns message fields includingtext, timestamp, and type: "app_mention". Author, thread, Block Kit, attachment, file, reaction, reply, app, bot, and subtype fields appear when Slack supplies them. Conversation, event timestamp, and workspace metadata are conversationId, optional conversationType, eventTimestamp, and workspaceId. event contains the original Slack event.
A runtime signal can’t choose the account. Slack only delivers mentions visible to the installed app.