A free prompt for anyone writing system prompts: paste one in and it finds pairs of rules that can't both be followed for the same message ("always give a price" vs "never quote prices", a 50-word limit vs a six-part answer). It quotes both rules, describes a realistic message where they collide, and suggests one fix. It also lists vague rules like "be brief" that read two ways. It doesn't rewrite your prompt, and it says so when there's nothing to report. Written to match my prompt packs.