Send a Slack message using an Incoming Webhook.
Add this task to send direct Slack notifications. Check the Slack documentation for more details.
type: "io.kestra.plugin.notifications.slack.slackincomingwebhook"Examples
Send a Slack notification on a failed flow execution.
id: unreliable_flow
namespace: company.team
tasks:
  - id: fail
    type: io.kestra.plugin.scripts.shell.Commands
    runner: PROCESS
    commands:
      - exit 1
errors:
  - id: alert_on_failure
    type: io.kestra.plugin.notifications.slack.SlackIncomingWebhook
    url: "{{ secret('SLACK_WEBHOOK') }}" # https://hooks.slack.com/services/xzy/xyz/xyz
    payload: |
      {
        "text": "Failure alert for flow {{ flow.namespace }}.{{ flow.id }} with ID {{ execution.id }}"
      }
Send a Slack message via incoming webhook with a text argument.
id: slack_incoming_webhook
namespace: company.team
tasks:
  - id: send_slack_message
    type: io.kestra.plugin.notifications.slack.SlackIncomingWebhook
    url: "{{ secret('SLACK_WEBHOOK') }}"
    payload: |
      {
        "text": "Hello from the workflow {{ flow.id }}"
      }
Send a Slack message via incoming webhook with a blocks argument, read more on blocks here.
id: slack_incoming_webhook
namespace: company.team
tasks:
  - id: send_slack_message
    type: io.kestra.plugin.notifications.slack.SlackIncomingWebhook
    url: "{{ secret('SLACK_WEBHOOK') }}"
    payload: |
      {
        "blocks": [
    		{
    			"type": "section",
    			"text": {
    				"type": "mrkdwn",
    				"text": "Hello from the workflow *{{ flow.id }}*"
    			}
    		}
    	]
      }
Send a Slack message with 'messageText' (handles Slack markdown, no escaping needed)
id: slack_incoming_webhook
namespace: company.team
inputs:
 - id: prompt
   type: STRING
   defaults: Summarize top 5 news from my region.
tasks:
 - id: news
   type: io.kestra.plugin.openai.Responses
   apiKey: "{{ kv('OPENAI_API_KEY') }}"
   model: gpt-4.1-mini
   input: "{{ inputs.prompt }}"
   toolChoice: REQUIRED
   tools:
     - type: web_search_preview
       search_context_size: low
       user_location:
         type: approximate
         city: Berlin
         region: Berlin
         country: DE
 - id: send_via_slack
   type: io.kestra.plugin.notifications.slack.SlackIncomingWebhook
   url: https://kestra.io/api/mock
   messageText: "Current news from Berlin: {{ outputs.news.outputText }}"
Send a Rocket Chat message via Slack incoming webhook.
id: rocket_chat_notification
namespace: company.team
tasks:
  - id: send_rocket_chat_message
    type: io.kestra.plugin.notifications.slack.SlackIncomingWebhook
    url: "{{ secret('ROCKET_CHAT_WEBHOOK') }}"
    payload: |
      {
        "alias": "Kestra TEST",
        "avatar": "https://avatars.githubusercontent.com/u/59033362?s=48",
        "emoji": ":smirk:",
        "roomId": "#my-channel",
        "text": "Sample",
        "tmshow": true,
        "attachments": [
          {
            "collapsed": false,
            "color": "#ff0000",
            "text": "Yay!",
            "title": "Attachment Example",
            "title_link": "https://rocket.chat",
            "title_link_download": false,
            "fields": [
              {
                "short": false,
                "title": "Test title",
                "value": "Test value"
              },
              {
                "short": true,
                "title": "Test title",
                "value": "Test value"
              }
            ]
          }
        ]
      }
Properties
url *Requiredstring
1Slack incoming webhook URL
Check the Create an Incoming Webhook documentation for more details.
messageText string
Message Text or JSON String
The message content as a raw string. It can be plain text with markdown, or a JSON object. If not a valid JSON object, it is automatically wrapped in {"text": "..."}. This property is ignored if the payload property is set.
options AbstractHttpOptionsTask-RequestOptions
Options
The options to set to customize the HTTP client
payload string
Slack message payload
Definitions
java.nio.charset.Charset
io.kestra.plugin.notifications.AbstractHttpOptionsTask-RequestOptions
connectTimeout string
durationThe time allowed to establish a connection to the server before failing.
connectionPoolIdleTimeout string
PT0SdurationThe time an idle connection can remain in the client's connection pool before being closed.
defaultCharset Charsetstring
UTF-8The default charset for the request.
headers object
HTTP headers
HTTP headers to include in the request
maxContentLength integerstring
10485760The maximum content length of the response.
readIdleTimeout string
PT5MdurationThe time allowed for a read connection to remain idle before closing it.
readTimeout string
PT10SdurationThe maximum time allowed for reading data from the server before failing.
