Create Slack Block

Use AI to turn a plain-language description into Slack Block Kit JSON, so you can build rich, interactive Slack messages without writing the JSON by hand.

What It Does

Takes a prompt describing the message you want and uses an AI model to generate Slack Block Kit JSON. It returns both a JSON string and a structured object, ready to feed into a Slack message node.

When To Use It

Use this when you want a formatted or interactive Slack message (headers, dividers, buttons, fields) but do not want to write Block Kit JSON yourself. Chain it before Send Slack Message (or another Slack send node) so the generated payload becomes that node's message input.

Configuration

Configure the node with these settings:

Field	What it controls
Prompt	Describe the Slack message you want in plain language. The AI generates Block Kit JSON from this description. Required.
Model	Which AI model generates the JSON. Defaults to `default` (balanced). Other options include `lite` (fast and cheap), `creative`, `analytical`, and specific models such as `claude-sonnet-5` and `gpt-5.5`. Required.
Temperature	Controls how deterministic the output is, from `0` to `1` in steps of `0.1`. Lower values produce more consistent results. Defaults to `0.7`. Required.
Validation Criteria	Optional rules the generated Block Kit JSON must pass. When set, the node checks the output and regenerates it until it passes or `Max Retries` is reached.
Max Retries	How many additional generation attempts to make if validation fails. Defaults to `2`, from `0` to `5`.

Outputs

The node passes these values downstream. Check the Outputs tab on the configured node to confirm exact paths.

Variable	Type	Description	Example
`slackMessage`	`string`	JSON string of the Slack message payload for direct use in Slack message nodes	`{{nodeId.slackMessage}}`
`slackMessageObject`	`object`	Structured Slack Block Kit message with text fallback and blocks	`{{nodeId.slackMessageObject}}`
`slackMessageObject.text`	`string`	Fallback text for notifications and accessibility	`{{nodeId.slackMessageObject.text}}`
`slackMessageObject.blocks`	`array<object \| object \| object \| object \| object \| object \| object \| object \| object \| object>`	Array of Slack Block Kit blocks	`{{nodeId.slackMessageObject.blocks}}`

Example Workflow

A workflow drafts a weekly metrics recap. A Create Slack Block node turns a prompt describing the key numbers into Block Kit JSON, then a Send Slack Message node posts {{createSlackBlockNode.slackMessage}} to the team's channel.

Send Slack Message
Send Message to Channel
Send Direct Message

Need More Help?

Reach the AskElephant support team by:

clicking the Support tab on the right side of your screen,
emailing [email protected],
or using @askelephant support in your dedicated Slack channel.