Enforce the no-useEffect rule when writing or reviewing React code. Activate when writing React components, refactoring existing useEffect calls, reviewing PRs that introduce useEffect, or when an agent adds useEffect "just in case." Provides five replacement patterns and the useMountEffect escape hatch.
TanStack Query (React Query) best practices for data fetching, caching, mutations, and server state management. Activate when building data-driven React applications with server state.
TanStack Router best practices for type-safe routing, data loading, search params, and navigation. Activate when building React applications with complex routing needs.
Use for Hono (web framework) development when Codex needs to consult Hono documentation or test Hono apps via the `hono` CLI. Trigger on requests about Hono CLI usage, searching/browsing Hono docs, or testing Hono routes without running a server.