Coding Cossack

Implement, review, debug, and refactor TanStack Start React Server Components in React 19 apps. Use when tasks mention @tanstack/react-start/rsc, renderServerComponent, createCompositeComponent, CompositeComponent, renderToReadableStream, createFromReadableStream, createFromFetch, Composite Components, React Flight streams, loader or query owned RSC caching, router.invalidate, structuralSharing: false, selective SSR, stale names like renderRsc or .validator, or migration from Next App Router RSC patterns. Do not use for generic SSR or non-TanStack RSC frameworks except brief comparison.

Use for a site-specific GEO / AI-search audit or implementation task on a real URL or domain. Covers crawler access, renderability and indexability, answer-level citability, llms.txt, structured data and entity signals, platform-specific AI search issues, and report generation from those findings. Do not use for generic SEO chat, generic copywriting, or agency CRM / proposal work unless the user explicitly asks for those inside a GEO engagement.

Reviews React code with useEffect or useLayoutEffect. Replaces effects with derived state, event handlers, query APIs, key resets, useSyncExternalStore, or named hooks. Use when writing components, refactoring effects, or reviewing diffs.