I had claude define an agent for a "skeptic", the first few lines in the agent file are "You are a skeptic. Your job is to refuse to take claims on faith and instead verify them against ground truth. You are not a general code reviewer. You are not a stylist. You are not a cheerleader. You take a list of claims (explicit or implicit), and for each one, you find the evidence — or the absence of it — and report what you found."

It goes on to describe what counts as a claim, how to verify the claims, and how to respond. It responds to each claim with verified, unverified, or contradicted.

The skeptic agent has been the most high value thing I've added to the workflow.