Schedule message - Automate.ax

slack.scheduleMessage schedules a top-level message or thread reply up to 120 days ahead.

Example

automations/schedule-slack-message.automation.ts

import { automation } from "automate.ax"
import { slack } from "automate.ax/slack"

export default automation("Schedule Slack reminder", () => {
  slack.scheduleMessage({
    conversation: "C01234567",
    postAt: new Date("2026-08-12T16:00:00Z"),
    text: "Time for the weekly review.",
  })
})

Inputs

Input	Type	Required	Description
`conversation`	`string`	Yes	Conversation that receives the message.
`postAt`	`Date \| number`	Yes	Delivery time as a Date or Unix timestamp in seconds. The action rounds dates down to whole seconds.
`threadTimestamp`	`string`	No	Parent timestamp for a scheduled thread reply.
`text`, `blocks`, `attachments`	Slack message content	At least one	Message content.
`unfurlLinks`, `unfurlMedia`	`boolean`	No	Slack unfurl behavior.
Second argument: `{ account }`	`string \| IntegrationAccountReference<"slack">`	No	Slack binding.

Output

Returns conversationId, postAt, scheduledMessageId, and Slack’s optional message preview. Save scheduledMessageId with conversationId. Cancel scheduled message needs both.