Slack Node

The slack node interacts with Slack via the Web API using a Bot User OAuth Token.

Credential Setup

Store your Bot User OAuth Token in workspace secrets under the name SLACK_TOKEN.

Required OAuth scopes:

chat:write — for send_message and send_dm
channels:read + conversations:read — for list_channels
im:write — for send_dm

Configuration Fields

Field	Type	Default	Description
`action`	`send_message` \| `send_dm` \| `list_channels`	`send_message`	Operation to perform
`channel`	string	—	Channel ID or name (for `send_message`)
`userId`	string	—	Slack user ID (for `send_dm`)
`message`	string	—	Message text (supports `{{}}`, Slack mrkdwn format)
`username`	string	—	Override bot display name
`iconEmoji`	string	—	Override bot icon (e.g. `:robot_face:`)

Actions

`send_message`

Posts a message to a channel. channel and message are required.

Output: { "ok": true, "ts": "<message timestamp>", "channel": "<channel>" }

`send_dm`

Opens a DM channel with the user and sends the message. userId and message are required.

Output: { "ok": true, "ts": "<message timestamp>", "userId": "<userId>" }

`list_channels`

Lists up to 200 non-archived channels the bot has access to.

Output: { "channels": [{ "id": "C123", "name": "general" }, ...] }

Use channel IDs (e.g. C012AB3CD) rather than names when possible — they are stable and avoid issues if channels are renamed.

Example Config

{
  "action": "send_message",
  "channel": "C012AB3CD",
  "message": "Workflow completed. Result: {{lastOutput.summary}}",
  "username": "Linea Bot",
  "iconEmoji": ":linea:"
}

Slack Node

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