Detect, replace, and lint-ban direct `useEffect` in React components and hooks. Prefer declarative replacements for derived state, fetching, event reactions, resets, and external sync; add ESLint or agent rules for a no-direct-useEffect policy. Use when writing, refactoring, reviewing, or migrating React code that imports or calls `useEffect`, or when an agent reaches for an effect by default. Do not use for ordinary React work with no effect smell, non-React code, or legitimate effect architecture outside React.