Explain It Back - a pop quiz on the code your AI wrote

Before you merge a diff an AI assistant wrote, prove you understand it. Paste the change: free in the browser, a diff reader (git or unified diffs, or a bare code paste), a numbered listing and a hot-spot scan that highlights removed guards, removed or skipped tests, error handling, auth, data, async code, retries and timeouts, regexes, loop bounds, manifests and TODOs. Two metered lanes: the quiz lane walks you through the change and sets four, six or eight questions pinned to lines - predict, why, break it, edge case, trace, test it - each with an answer key provable from the listing; the grade lane marks your written answers solid, shaky, wrong or blank and stamps the paper cleared to ship, re-read first, hold the merge, or answer more. The page scores the paper, re-checks every reply (pins, hot-spot coverage, marks on empty boxes, the verdict rules), flags answers you were sure of that came back wrong, and sets a fresh quiz on what you missed. Built on @bmad-code-org/bmad-walkthrough and @lyndonkl/evaluation-rubrics.