A React guide for building forms with TanStack Form and checking their values with validation libraries such as Zod, Yup, and Valibot. It covers nested fields, field lists, asynchronous checks, linked fields, resets, and React Native forms.

Use it for type-safe forms, validation, nested or repeatable fields, delayed checks, fields that depend on one another, and form reset behavior.

It helps manage complex form state and validation without scattering rules across individual input components.

react-forms — Skill for Claude Code and Codex by fusengine: A React guide for building forms with TanStack Form…

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods

npx agentmods add skills/fusengine/agents/react-forms

Any agent

npx skills add fusengine/agents --skill react-forms

Clone the repo

git clone --depth 1 https://github.com/fusengine/agents

Made for: Claude Code, Codex.

Or install fuse-react, the plugin that ships this one along with the rest of its 8 skills, 1 agent.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/skills/fusengine/agents/react-forms.svg)](https://agentmods.dev/skills/fusengine/agents/react-forms)

Your own site

<a href="https://agentmods.dev/skills/fusengine/agents/react-forms"><img src="https://agentmods.dev/badge/skills/fusengine/agents/react-forms.svg" alt="Measured on agentmods" height="20"></a>

Per session 35 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,667 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. Scan, not verified.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5	$0.00035	$0.01667
Opus 5	$0.00017	$0.00834
Sonnet 5	$0.00007	$0.00333
Haiku 4.5	$0.00003	$0.00167

Measured yesterday against content hash cdab707e3438, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

react-forms scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

plugins/react-expert/skills/react-forms/SKILL.md · 168 lines

How it starts

The opening of the file, as written. The whole thing — 168 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Also covers array/nested fields with dot notation, listeners for side effects (onMount/onChange/onBlur with debouncing), linked/cross-field validation, reactivity via useStore selectors, the Reset API, SSR/hydration (TanStack Start), devtools, and React Native patterns. This is the React skill for TanStack Form — for the Next.js Server Actions-specific variant see nextjs-tanstack-form, and for SOLID file-organization rules see solid-react.

TanStack Form v1 Core Features

Agent Workflow (MANDATORY)

Before ANY implementation, use TeamCreate to spawn 3 agents:

fuse-ai-pilot:explore-codebase - Analyze existing form components and validation patterns
fuse-ai-pilot:research-expert - Verify latest TanStack Form v1 docs via Context7/Exa
mcp__context7__query-docs - Check Zod validation and React 19 Server Actions patterns

After implementation, run fuse-ai-pilot:sniper for validation.

MANDATORY: SOLID Principles

ALWAYS apply SOLID principles from solid-react skill.

→ See ../solid-react/SKILL.md for complete rules

Key Rules:

Files < 100 lines (split at 90)
Interfaces in modules/[feature]/src/interfaces/
JSDoc mandatory on all exports
No business logic in components

Core Hooks

Hook	Purpose	Guide
`useForm()`	Initialize form with validation	`references/tanstack-form-basics.md`
`useField()`	Subscribe to individual field	`references/tanstack-form-basics.md`
`form.Field`	Render prop component for fields	`references/tanstack-form-basics.md`
`form.Subscribe`	Watch form state changes	`references/tanstack-form-basics.md`

Read the full file on GitHub · 168 lines

Files

What ships with it

33 files beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

yesterday First seen · 168 lines · 35 tokens per session scan A cdab707e3438

Subscribe to this mod's changes

react-forms is a skill published in the GitHub repository fusengine/agents (25 stars, last pushed 1mo ago), licensed MIT. It adds 35 tokens to every session and 1,667 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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