@charl-p-botha I think your reading is right. The current docs say Genie supports both scalar and table-valued Unity Catalog functions, and the August 27 release notes explicitly say that both can be attached as Genie Agent tool.

Given the UI message, the table-valued wrapper looks like a reasonable workaround for now rather than an intended requirement.

If it persists, it may be worth capturing the workspace cloud/region, function definition and DESCRIBE FUNCTION EXTENDED output, then raising it with Support so they can check whether this is specific to the workspace or current UI behavior.