PR Author inspects the diff between your current branch and its base, then writes a review-ready pull request. It produces an imperative, convention-matching title plus a structured description with a real summary, a grouped changes list, a concrete test plan, and a checklist. Everything is grounded in the actual diff — it never invents tests or features, diffs against the merge base so you only see this branch's work, respects an existing PULL_REQUEST_TEMPLATE, flags risks like migrations and breaking changes, and can open the PR for you via the GitHub CLI.