It seems that you’re calling a sub workflow. If I’m not mistaken, the fromAI function is only available in Node as tools
With Call n8n workflow tool, you can specify the value in the call subworflow description.
For example, here is part of my prompt:
You will send the following fields to the tool: issue_type, date, criticality, description and user_name
and the execute workflow trigger receives the following query
Does it make sense?