If a coworker dumped a 5k-line code review on you, you'd tell them to come back when it's broken down into smaller reviewable chunks. It should be no different with agent harnesses. Get them to break that stuff down, then review each part independently.
I wrote some words about agentic coding and mental models: philbooth.me/blog/agentic...
Agentic coding and mental models
Personal website of Phil Booth
philbooth.me