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Slack ACTION

Build and Send a Block Kit Message

Configure custom blocks and send to a channel, group, or user. See the documentation.
  • Action
  • Writes data
  • OAuth
  • SDK
  • MCP

IMPLEMENTATION

Call this tool

Connect a user's Slack account once, then configure and run Build and Send a Block Kit Message from your backend or agent.

import { PipedreamClient } from "@pipedream/sdk"

const pd = new PipedreamClient({
  projectId: process.env.PIPEDREAM_PROJECT_ID!,
  clientId: process.env.PIPEDREAM_CLIENT_ID!,
  clientSecret: process.env.PIPEDREAM_CLIENT_SECRET!,
  projectEnvironment: "production",
})

const result = await pd.actions.run({
  id: "slack_v2-send-block-kit-message",
  externalUserId: "{external_user_id}", // any stable ID for this user in your system
  configuredProps: {
    slack_v2: { authProvisionId: "apn_xxxxxxx" },
    conversation: "Channel",
    text: "Notification Text",
  },
})

console.log(result)

SCHEMA

Inputs

Pipedream supplies the connected account. Your application provides the operation-specific values below. Dynamic inputs are resolved against that user's account.

Build and Send a Block Kit Message inputs
Property Type Description
conversation Channel string
Prefer a channel ID (e.g. C1234567890) — use List Channels to look it up; it resolves instantly. A channel NAME (e.g. general or #general) is also accepted, but resolving it scans up to 5 conversations.list pages (~5,000 channels), which is slow and, on large workspaces, can be rate-limited or fail with a ConfigurationError if the channel is beyond that bound — pass the ID whenever you have it. Depending on the action, this may also accept a user ID (opens a direct message) or a group DM ID — use Find User by Email / Find User by ID to resolve a user ID, or List Group Conversations for group DM IDs.
Required
text Notification Text string
Optionally provide a string for Slack to display as the new message notification (if you do not provide this, notification will be blank).
Optional
as_user Send as User boolean
Optionally pass true to post the message as the authenticated user, instead of as a bot. Defaults to false.
Optional
addToChannel Add app to channel automatically? boolean
If true, the app will be added to the specified non-DM channel(s) automatically. If false, you must add the app to the channel manually to post to a private channel as a bot. Defaults to false.
Required
post_at Schedule message string
Messages can only be scheduled up to 120 days in advance, and cannot be scheduled for the past. The datetime should be in ISO 8601 format. (Example: 2014-01-01T00:00:00Z)
Optional
include_sent_via_pipedream_flag Include link to Pipedream boolean
Defaults to true, includes a link to Pipedream at the end of your Slack message.
Optional
username Bot Username string
Optionally customize your bot's user name (default is Pipedream). Must be used in conjunction with Send as User set to false, otherwise ignored.
Optional
icon_emoji Icon (emoji) string
Optionally provide an emoji to use as the icon for this message, wrapped in colons. E.g., :fire:. Overrides icon_url. Must be used in conjunction with Send as User set to false, otherwise ignored. Use List Icon (emoji) Options to look up valid emoji names for this workspace, including custom emoji.
Optional
icon_url Icon (image URL) string
Optionally provide an image URL to use as the icon for this message. Must be used in conjunction with Send as User set to false, otherwise ignored.
Optional
thread_ts Message Timestamp string
Provide another message's ts value to make this message a reply (e.g., if triggering on new Slack messages, enter {{event.ts}}). Avoid using a reply's ts value; use its parent instead. e.g. 1403051575.000407.
Optional
thread_broadcast Send Channel Message boolean
If true, posts in the thread and channel. Used in conjunction with Message Timestamp and indicates whether reply should be made visible to everyone in the channel. Defaults to false.
Optional
metadata_event_type Metadata Event Type string
The name of the metadata event. Example: task_created
Optional
metadata_event_payload Metadata Event Payload string
The payload of the metadata event. Must be a JSON string. Example: { "id": "11223", "title": "Redesign Homepage"}
Optional
unfurl_links Unfurl Links boolean
Default to false. Pass true to enable unfurling of links.
Optional
unfurl_media Unfurl Media boolean
Defaults to false. Pass true to enable unfurling of media content.
Optional
passArrayOrConfigure Add Blocks - Reference Existing Blocks Array or Configure Manually? string
Would you like to reference an array of blocks from a previous step (for example, {{steps.blocks.$return_value}}), or configure them in this action?
Optional
blocks Blocks string

Enter an array of structured blocks as a URL-encoded string. E.g., [{ "type": "section", "text": { "type": "mrkdwn", "text": "This is a mrkdwn section block :ghost: *this is bold*, and ~this is crossed out~, and <https://pipedream.com|this is a link>" }}]

Tip: Construct your blocks in a code step, return them as an array, and then pass the return value to this step.

Optional
section1 Section Block 1 string
Add a section block to your message and configure with plain text or mrkdwn. See Slack's docs for more info.
Optional
section2 Section Block 2 string
Add a section block to your message and configure with plain text or mrkdwn. See Slack's docs for more info.
Optional
section3 Section Block 3 string
Add a section block to your message and configure with plain text or mrkdwn. See Slack's docs for more info.
Optional
section4 Section Block 4 string
Add a section block to your message and configure with plain text or mrkdwn. See Slack's docs for more info.
Optional
section5 Section Block 5 string
Add a section block to your message and configure with plain text or mrkdwn. See Slack's docs for more info.
Optional
context1 Context Block 1 string[]
Add a context block to your message and configure with plain text or mrkdwn. Define multiple items if you'd like multiple elements in the context block. See Slack's docs for more info.
Optional
context2 Context Block 2 string[]
Add a context block to your message and configure with plain text or mrkdwn. Define multiple items if you'd like multiple elements in the context block. See Slack's docs for more info.
Optional
context3 Context Block 3 string[]
Add a context block to your message and configure with plain text or mrkdwn. Define multiple items if you'd like multiple elements in the context block. See Slack's docs for more info.
Optional
context4 Context Block 4 string[]
Add a context block to your message and configure with plain text or mrkdwn. Define multiple items if you'd like multiple elements in the context block. See Slack's docs for more info.
Optional
context5 Context Block 5 string[]
Add a context block to your message and configure with plain text or mrkdwn. Define multiple items if you'd like multiple elements in the context block. See Slack's docs for more info.
Optional
linkButton1 Link Button 1 object
Add a link button to your message. Enter the button text as the key and the link URL as the value. Example: {"View docs": "https://example.com", "Open dashboard": "https://app.example.com"}. Configure multiple buttons in the object to render them inline, or add additional Link Button blocks to render them vertically. See Slack's docs for more info.
Optional
linkButton2 Link Button 2 object
Add a link button to your message. Enter the button text as the key and the link URL as the value. Example: {"View docs": "https://example.com", "Open dashboard": "https://app.example.com"}. Configure multiple buttons in the object to render them inline, or add additional Link Button blocks to render them vertically. See Slack's docs for more info.
Optional
linkButton3 Link Button 3 object
Add a link button to your message. Enter the button text as the key and the link URL as the value. Example: {"View docs": "https://example.com", "Open dashboard": "https://app.example.com"}. Configure multiple buttons in the object to render them inline, or add additional Link Button blocks to render them vertically. See Slack's docs for more info.
Optional
linkButton4 Link Button 4 object
Add a link button to your message. Enter the button text as the key and the link URL as the value. Example: {"View docs": "https://example.com", "Open dashboard": "https://app.example.com"}. Configure multiple buttons in the object to render them inline, or add additional Link Button blocks to render them vertically. See Slack's docs for more info.
Optional
linkButton5 Link Button 5 object
Add a link button to your message. Enter the button text as the key and the link URL as the value. Example: {"View docs": "https://example.com", "Open dashboard": "https://app.example.com"}. Configure multiple buttons in the object to render them inline, or add additional Link Button blocks to render them vertically. See Slack's docs for more info.
Optional

REFERENCE

Tool details

Behavior hints are published with the component in the Pipedream registry and surface as MCP tool annotations, so an agent can reason about a tool before it calls it.

Registry key
slack_v2-send-block-kit-message
Version
0.5.11
App
Slack
Authentication
OAuth
Read-only
No
Destructive
No
Open world
Yes