Why don't LLM harnesses enable/expose custom middleware hooks?
I want to be able to execute a prompt derived from a piece of structured data (JSON) by transforming it into markdown and decorating it at prompt-time, without building my own infrastructure around or alongside the harness...
I am writing my own harness, and I would love to hear more about what you have in mind.
Can you give an example of your use case?
They do. See: Claude Code leak.