New Message in Channel

Trigger a Flow when a new message is added to a Slack channel.

Note: If you pair this Event card with a Send Message to Channel Action card, you may create a loop. When a channel is notified that a new message is posted, the Flow will respond to its own messages.

Unless otherwise indicated, field types are text.


  • Channel (drop-down): list of public channels you can monitor; a maximum of 12,000 channels of which you're a member will be displayed.

  • Channel ID: Slack channel's ID; field is not used if a channel is selected from the Channel drop-down.



If you want to enter a channel ID manually, you must select Enter Channel ID first from the Channel drop-down. Only IDs for public channels are allowed.

If you enter an ID for a private channel in the Channel ID field, you will receive a Slack connection error. Make sure to check the channel ID.


  • Message

    • Text: text of the message

    • Timestamp: timestamp when the message was added

  • Author

    • Full Name: user's full name

    • Username: user's Slack username (without @ symbol)

    • User ID: user's unique Slack ID