TanStack Form is a headless form state manager, not a UI component library. You provide your own inputs and handle their events; TanStack Form manages validation, state, and submission logic.
When to use: Complex multi-step forms, reusable form patterns, dynamic field arrays, cross-field validation, async server validation, forms requiring fine-grained performance optimization.
When NOT to use: Simple forms with native HTML validation (use plain form elements), server-only validation (use Server Actions), purely static forms with no validation.
TanStack Form v1 headless form state management for React. Covers field validation (sync/async, debouncing), form submission, array fields, linked fields, form composition patterns, and Standard Schema integration (Zod, Valibot, ArkType, Yup). Use when building forms with complex validation, implementing reusable form components, handling dynamic field lists, managing form state, or integrating validation libraries. Source: oakoss/agent-skills.