> basically everyone asks for a JSON schema for the tool call and uses that to validate and re-prompt the LLM until it emits something with a valid schema.

Basically no one is doing that since 2024, have you been living under the rock? Read about constrained decoding.

> I have had failures when I want a field to be specifically formatted Markdown or something.

And Jev has an advantage here because it can’t generate anything?