Legacy Risk PR Sheriff

Legacy Risk PR Sheriff is built for reviewing changes in old, fragile, or highly coupled systems. It looks for hidden dependencies, brittle abstractions, regression risks, and places where a small change might have broad side effects. Unlike a generic reviewer, it pays attention to the realities of legacy code, where the main danger is often unintended interaction rather than obvious syntax problems.

This prompt is a strong fit for senior engineers, modernization teams, and maintainers who need to protect critical systems while gradually improving them. It produces feedback that distinguishes safe cleanup from dangerous rewrites, helping teams avoid accidental outages. The output is especially valuable when working on code that has poor tests, outdated patterns, or unclear ownership. It supports a more careful legacy review process that reduces surprise regressions.

Customize with {{CODE_DIFF}}, the system or module name in {{SYSTEM_NAME}}, and any known coupling concerns in {{KNOWN_RISKS}}. If you want the model to focus on a modernization goal, set {{MODERNIZATION_GOAL}} to extraction, simplification, or testability. The response gives a risk-ranked list of concerns, plus practical next steps that preserve behavior. Use it before touching high-value modules that have survived many years for a reason.