I was not thinking of the agent case specifically. But yes, you have to make the APIs idempotent, either with these step checkpoints or by wrapping the underlying API. It's not hard to make a postgres-transaction-based idempotency layer wrapper, then you can have a much longer idempotency TTL.

> so for long running workflows you need to capture the state output anyways.

That would be a _very_ long running workflow. Probably worth breaking up into different subtasks or, I guess as Absurd does it, step checkpoints.