A guide for using Formisch, a schema-based form library that works across several web and mobile frameworks. It covers form state, input validation, field arrays, and Formisch packages.

Use it when building forms with Angular, Preact, Qwik, React, React Native, Solid, Svelte, or Vue, including forms that use Valibot schemas.

It gives the coding agent the library-specific knowledge needed to create and maintain forms correctly across supported frameworks.

formisch — Skill for Claude Code by open-circle/agent-skills

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.

Any agent

npx skills add open-circle/agent-skills --skill formisch

Clone the repo

git clone --depth 1 https://github.com/open-circle/agent-skills

Made for: Claude Code.

Or install formisch, the plugin that ships this one along with the rest of its 1 skill.

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/open-circle/agent-skills/formisch/github.svg)](https://agentmods.dev/skills/open-circle/agent-skills/formisch)

Your own site

<a href="https://agentmods.dev/skills/open-circle/agent-skills/formisch"><img src="https://agentmods.dev/badge/skills/open-circle/agent-skills/formisch/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/skills/open-circle/agent-skills/formisch"><img src="https://agentmods.dev/badge/skills/open-circle/agent-skills/formisch.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 68 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 8,322 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector pass 7 Sept 2026
Socket pass 18 Mar 2026
Snyk pass 28 Feb 2026

How audits are shown

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 5.1	$0.00068	$0.08322
Opus 5.5	$0.00027	$0.03329
Sonnet 5.5	$0.00014	$0.01664
Haiku 4.5	$0.00007	$0.00832

Measured 8d ago against content hash b36b225c3357, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

formisch 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 8d ago.

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.

skills/formisch/SKILL.md · 1,166 lines

How it starts

The opening of the file, as written. The whole thing — 1,166 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Formisch

This skill helps AI agents work effectively with Formisch, the schema-based, headless form library for modern frameworks.

When to Use This Skill

When the user asks about form handling with Formisch
When managing form state and validation
When working with Angular, HonoX, Preact, Qwik, React, React Native, Solid, Svelte, or Vue forms
When integrating Valibot schemas with forms

Introduction

Formisch is a schema-based, headless form library that works across multiple frameworks. Key highlights:

Small bundle size — Starting at ~2.5 kB
Schema-based validation — Uses Valibot for type-safe validation
Headless design — You control the UI completely
Type safety — Full TypeScript support with autocompletion
Framework-native — Native performance for each supported framework

Supported Frameworks

Framework	Package	Hook/Primitive
Angular	`@formisch/angular`	`injectForm`
HonoX	`@formisch/honox`	`useForm`
Preact	`@formisch/preact`	`useForm`
Qwik	`@formisch/qwik`	`useForm$`
React	`@formisch/react`	`useForm`
React Native	`@formisch/react-native`	`useForm`
SolidJS	`@formisch/solid`	`createForm`
Svelte	`@formisch/svelte`	`createForm`
Vue	`@formisch/vue`	`useForm`

Experimental SolidJS 2 support is available through the @formisch/solid/v2 entry point of @formisch/solid (v1.2.0 or later). It requires solid-js and @solidjs/web v2. The default @formisch/solid entry point targets SolidJS 1.

Installation

1. Install Valibot (peer dependency)

npm install valibot

2. Install Formisch for your framework

npm install @formisch/react         # React
npm install @formisch/angular       # Angular
npm install @formisch/vue           # Vue
npm install @formisch/solid         # SolidJS
npm install @formisch/preact        # Preact
npm install @formisch/svelte        # Svelte
npm install @formisch/qwik          # Qwik
npm install @formisch/react-native  # React Native
npm install @formisch/honox         # HonoX

Read the full file on GitHub · 1,166 lines

Files

What ships with it

1 file 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.

.claude-plugin/plugin.json 414 B

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.

8d ago Changed · +2 lines b36b225c3357
9d ago Changed · +45 lines · +4 tokens per session 1f6585845a8f
2mo ago First seen · 1,119 lines · 64 tokens per session scan A 20d7ec7777e3

Subscribe to this mod's changes

formisch is a skill published in the GitHub repository open-circle/agent-skills (17 stars, last pushed 9d ago), licensed MIT. It adds 68 tokens to every session and 8,322 once invoked, about $0.0003 per session on Opus 5.5. 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 2026-08-30.

Frontend

formisch next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
formischopen-circle/agent-skills	Skill	17	9d ago	MIT	A	68	Claude Code
imagegenopenai/codex	Skill	133k	yesterday	Apache-2.0	A	113	Codex
playwright-climicrosoft/playwright	Skill	99k	yesterday	Apache-2.0	A	19	Claude Code
local-ai-agentsmicrosoft/ai-agents-for-beginners	Skill	79k	4d ago	MIT	A	200	Claude Code, Codex
systematic-debuggingobra/superpowers	Skill	313k	3d ago	MIT	A	21	Claude Code
next-cache-components-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	yesterday	MIT	A	103	Claude Code