TanStack Start Server Runtime and APIs

Use this skill when the task is primarily about TanStack Start's request lifecycle, server-side APIs, middleware flow, or safe server and client separation.

Scope

• server functions and server routes
• middleware composition and ordering
• src/server.ts and src/client.tsx entrypoint concerns
• request and response lifecycle
• environment functions and env-variable boundaries
• typed request context propagation

Routing cues

• createServerFn, useServerFn, server: { handlers }, createHandlers, createMiddleware, useSession, setResponseHeaders, setResponseStatus, src/server.ts, src/client.tsx, or VITE_ env boundaries -> use this skill
• SSR-mode selection, hydration, or import protection as the primary concern -> use tanstack-start-rendering-and-execution
• hosting provider selection, Nitro, Cloudflare, Netlify, or observability plumbing -> use tanstack-start-deployment-and-runtime-ops
• auth provider strategy, sessions as product behavior, or route protection flows -> use tanstack-start-auth-and-backend-integrations