Hey I am having a problem, when I pass a parameter to a flow that does not fit the pydantic model, the on_failure function does not trigger. Anyone faced such thing?

hi @Nir Kopp - if your flow never starts, it makes sense to me that your

on_failure

hook would not trigger. we validate parameters before we create the flow run in the API, so orchestration logic like state hooks never runs

There is any way to run a callback to a validation error like that?

depending on what you need a callback for, you may want to put a

field_validator

/

model_validator

on your model

Thanks!