`JsonStructuredData.createJsonStructure<List&lt...

# koog-agentic-framework

[S.]

JsonStructuredData.createJsonStructure<List<NoteExercise>>() this used to work with 0.3.0 but now crashes with Only object-like and no polymorphic types are supported for Default generator, got LIST . Do I now have to specify the FULL schema type for polymorphism, and if so, where do I do that?

[Konstantin]

Hey, @S.
Yep, the Default one requires class, object or map. Try using StandardJsonSchemaGenerator, it should support Polymorphic types.

[Andrey Bragin]

Yes, the default generator is BasicJsonSchemaGenerator which does not support polymorphism. You can use StandardJsonSchemaGenerator if you need more advanced schemas. And with new API, you might not even need to create schemas by hand, there's a higher level functions now, where you can just supply the class as a type parameter and it will choose the best structured output strategy (native/manual) and schema based on the model you are using. You can check these examples
https://github.com/JetBrains/koog/tree/develop/examples%2Fsrc%2Fmain%2Fkotlin%2Fai%2Fkoog%2Fagents%2Fexample%2Fstructuredoutput

[S.]

just passing in StandardJsonSchemaGenerator does not work either.
I assume the new API you mean is nodeLLMRequestStructured ?
I'm just trying to use simpleOpenAIExecutor().executeStructed() and it's StructuredOutputConfig needs a schema

[Andrey Bragin]

The new API is actually available on different levels, including executor.executeStructured , here’s related issue comment. But the main problem is that you are passing List<NoteExercise> . As the error message says, you can’t pass lists, you need to pass a class. E.g. wrapping your list in a class

[S.]

I see. I thought it would work with the StandardGenerator

[S.]

It does work after wrapping it in a class though, and just using type parameters is also nice, thanks

[S.]

GPT5 takes minutes for what was 5 seconds for 4.1 despite minimal reasoning effort though 😵‍💫