Slack Send Message

Send a message to a Slack channel. In streaming mode, sends one message per input item.

Requires a Slack connection with chat:write scope.

Configuration

Field	Description	Notes
Connection	Slack connection to use	Required
Channel	Channel name or ID	Required. Supports templates. e.g. #general or C01234567
Message	Message text	Required. Supports templates and Slack mrkdwn
Message Type	text or blocks	Default: text
Blocks JSON	Block Kit JSON array	Shown when Message Type is blocks. Supports templates
Thread Timestamp	Parent message ts to reply in thread	Optional. Supports templates
Unfurl Links	Enable link previews	Default: false

Output

Returns the Slack API response:

Field	Description
ok	Whether the message was sent successfully
ts	Timestamp of the sent message (use as ID for updates/threads)
channel	Channel ID where the message was posted

Block Kit Example

When using Block Kit, set Message Type to blocks and provide a JSON array:

[
  {
    "type": "section",
    "text": {
      "type": "mrkdwn",
      "text": "New deployment completed"
    }
  },
  {
    "type": "section",
    "fields": [
      { "type": "mrkdwn", "text": "*Environment:*\nProduction" },
      { "type": "mrkdwn", "text": "*Status:*\nSuccess" }
    ]
  }
]

TIP

Even when using Block Kit, provide a Message text as a fallback for notifications and accessibility.