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Use Slack to send fixed text and values from the flow to a workspace channel.

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Connect Slack

Open the block’s Setup step:
  1. Select Send Channel Message.
  2. Select Connect to Slack and authorize the workspace. Use Reconnect if the connection’s access has changed.
  3. Continue to Configure.
The connection belongs to the agent and can be reused by Slack blocks across its flows. Other agents need their own connection.

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Configure the message

Both fields are required. Channel shows the non-archived public and private channels available to the Slack connection. Select the channel in the editor; it cannot use a variable or be chosen by Ask AI. Message can combine fixed text with values from Available Variables. Place the Slack block after any blocks that provide the values it uses. For example:
New appointment request from caller_name for appointment_time.
Select each value from Available Variables rather than typing its variable name as plain text.

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Choose when to send it

Use live call when the message is needed while the conversation is active. Use post-call when it can wait until the call ends, so the caller does not wait for Slack. In Live Call, Slack also supports interim messages and call outcome tagging. See Common Block Settings.

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Test Slack

The block test resolves the configured message and shows it with the selected channel in Slack Preview before sending it:
  1. Open Test and enter safe sample values for any variables.
  2. Review the channel and resolved message in Slack Preview.
  3. Select Test.
  4. Confirm that the message appears in the intended Slack channel.
Then test the complete flow and confirm that its variables resolve correctly. During a Web Chat test, expand Slack in the action trace. After a phone call, open Call Details, select Blocks, and expand Slack to confirm its execution.
Testing Slack sends a real message to the selected channel. Use a channel and content that are safe for testing, then remove the message if it is no longer needed.

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Troubleshooting

Return to Setup and select Connect to Slack. If Slack was already connected, select Reconnect to refresh its access, then open Configure again.
Confirm that the channel is not archived and is available to the Slack connection. Reconnect Slack if its channel access changed. Private channels appear only when the connection can access them.
Review the selected channel in Slack Preview and confirm that the Slack connection can post there. Return to Configure to select the intended channel, then test again.
Confirm that the variable is available before the Slack block runs. Test the upstream path that creates it, then review its resolved value in Slack Preview before testing again.
Last modified on July 17, 2026