Agent + structured output + middleware error

[xuro-langchain]

@hwndrer

Hi!

After calling an agent (via .invoke()) with a bound middleware and structured output, I get an error:

Invalid response from “wrapModelCall” in middleware “MiddlewareName”: expected AIMessage, got object.

Because of this, I have to do something like this at the end of each middleware.
Maybe I’m doing something wrong? Please share your advice on how to avoid this.

If you’re modifying the response, is it possible for you to have this middleware in aftermodel instead?