slack.message.send

Send a Slack message with an organization-scoped Slack connection.

Overview

Property	Value
Workflow type	Atomic
Library	App-slack
Version	1.0

Input Schema

Field	Type	Required	Default	Description
organization_uuid	uuid	Yes	—	Organization that owns the Slack connection
connection_uuid	uuid	Yes	—	Slack CloudConnection UUID
channel	string	Yes	—	Slack conversation id or name
text	string	Yes	—	Message text with Slack mrkdwn support
blocks	json	No	—	Optional Block Kit blocks list
thread_ts	string	No	—	Thread timestamp for replies
username	string	No	—	Optional bot display name override
icon_emoji	string	No	—	Optional bot icon override
unfurl_links	boolean	No	—	Slack unfurl_links flag
unfurl_media	boolean	No	—	Slack unfurl_media flag
workflow_run_id	string	No	—	Parent DAG run id (auto-injected by the engine when used as a DAG step)

Output Schema

Field	Type	Required	Default	Description
channel	string	No	—	Slack channel id that received the message
message_ts	string	No	—	Slack message timestamp
thread_ts	string	No	—	Thread timestamp for follow-up replies
permalink	string	No	—	Slack permalink when resolved
workflow_run_id	string	No	—	Parent DAG run id (auto-injected by the engine when used as a DAG step)
failure_reason	string	No	—	Human-readable failure reason (engine-stamped)
failure_type	string	No	—	Failure category (engine-stamped)
failed_action	string	No	—	Action that failed (engine-stamped)
failed_at_state	string	No	—	State where the workflow failed (engine-stamped)
failed_step	string	No	—	DAG step that failed (engine-stamped)
failed_layer	string	No	—	DAG layer that failed (engine-stamped)
error	string	No	—	Error message (engine-stamped)
error_type	string	No	—	Error class name (engine-stamped)

States

State	Initial	Terminal	Success	Auto-advance	Description
pending	Yes	No	—	execute	—
completed	No	Yes	Yes	—	—
failed	No	Yes	No	—	—

State Diagram

Transitions

From	Action	To	Description
pending	execute	completed	—
* (any state)	fail	failed	—

API Usage

POST /api/workflows/start
Content-Type: application/json

{
  "workflow_type": "slack.message.send",
  "initial_data": {
    "organization_uuid": "value",
    "connection_uuid": "value",
    "channel": "value",
    "text": "value"
  }
}