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What you’ll learn

  • How wait until some time (e.g. “tomorrow 2pm”) before running an action.
  • How to use the core.require action to check conditions.
  • How to retry a child workflow until a condition is met.

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Wait until

Under the if-conditions tab of any action, you can configure a wait_until condition. This condition takes a human-readable string (e.g. “tomorrow 2pm”) and waits until that time.

You can specify relative dates, for example:

  • tomorrow at 2pm
  • in 2 days

Or absolute dates, for example:

  • 2025-05-01 at 2pm
  • March 21st 2025 at 10am

Under-the-hood, we use the dateparser library to parse the human-readable string. View dateparser docs here.

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Require

Require accepts expressions similar to if-conditions. Learn more about conditional expressions here. View all available operators (e.g. ==, !=, >, >=, <, <=) here.

The core.require action checks if any or all of multiple conditions are met. It takes three arguments:

  • conditions: A list of expressions that evaluate to booleans e.g. FN.length(ACTIONS.some_action.result.some_array) > 0
  • raise_error: If true, the workflow will fail if the conditions (all or any) are not met.
  • require_all: If true, all conditions must be met for the workflow to continue. If false, only one condition needs to be met.

For example, the following core.require action fails if the length of the some_array is greater than 0 and email is equal to “john@acme.com”.

conditions:
  - ${{ FN.length(ACTIONS.some_action.result.some_array) > 0 }}
  - ${{ ACTIONS.some_action.result.email == "john@acme.com" }}

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Retry until

Child workflows return the full context of the workflow run (e.g. action inputs and outputs) by default. This is not easy to work with when using retry_until.

Specify an output schema for the child workflow to return specific data from the workflow run. Learn more about output schemas in the child workflows tutorial here.

Under the if-conditions tab of any action, you can configure a retry_until condition. To make use of this condition, define a conditional expression on the same action’s result.

For example, the following execute child workflow action will retry until the child workflow returns an ack field with a value of true:

retry_until: ${{ ACTIONS.send_reminder.result.ack == True }}