The workflow builder needs to know what data comes back from an API, before the action is even run. This helps us assign variables and give sample data, in case the API is sensitive and the user can't run the action.
After you have properly built the API response mappers, and have run the action you are building in the Apps screen and verified the response is properly mapping in the right format, go to the response attributes tab and click on Generate Attributes.
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This uses AI to tag all the data and what keys come back from the API, and assign data types to them.
Attribute generation must be run before an Action will function properly within the workflow builder.