When should a variable be marked as 'available for input' in Salesforce?

Marking a variable as 'available for input' is essential when users need to set its value at the beginning of the flow. This designation allows the flow to accept a value from the user or the process that triggers the flow. By doing this, the variable can be customized based on user input, providing flexibility and adaptability for the flow's execution.

In scenarios where the variable is intended to capture specific user input (such as selecting a record, entering a date, or providing other pertinent details), marking it as available for input ensures that the flow can utilize this input effectively throughout its processes.

Other situations, such as using a formula value or running the flow as an automated process, do not require the variable to be set by user input at the start. Similarly, if a variable is constant, it does not make sense for it to be marked as available for input, as its value will not change. Such considerations help guide the correct use of variables in Salesforce flows, ensuring they function appropriately for their intended purpose.