What is mobx-formkit-composer?

A utility for coordinating several independent forms in the MobX FormKit JavaScript library. MobX is a JavaScript state-management library.

Use it for pages with multiple forms, such as registration and profile sections. It can check combined validity and run batch validation, submission, clearing, or resetting.

It avoids handling validation, submission, clearing, resetting, values, and errors separately for every form section.

mobx-formkit-composer — Skill for Claude Code and Codex by foxhound87

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 foxhound87/skills --skill mobx-formkit-composer

Clone the repo

git clone --depth 1 https://github.com/foxhound87/skills

Made for: Claude Code, Codex.

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/foxhound87/skills/mobx-formkit-composer/github.svg)](https://agentmods.dev/skills/foxhound87/skills/mobx-formkit-composer)

Your own site

<a href="https://agentmods.dev/skills/foxhound87/skills/mobx-formkit-composer"><img src="https://agentmods.dev/badge/skills/foxhound87/skills/mobx-formkit-composer/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/foxhound87/skills/mobx-formkit-composer"><img src="https://agentmods.dev/badge/skills/foxhound87/skills/mobx-formkit-composer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 32 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,432 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.

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	$0.00032	$0.01432
Opus 5.5	$0.00013	$0.00573
Sonnet 5.5	$0.00006	$0.00286
Haiku 4.5	$0.00003	$0.00143

Measured 2mo ago against content hash 3acd1996bca8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

mobx-formkit-composer 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 2mo 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.

mobx-formkit-composer/SKILL.md · 215 lines

How it starts

The opening of the file, as written. The whole thing — 215 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Skill: mobx-formkit-composer

Mission

Guide the user through using the Forms Composer utility in mobx-formkit to manage and orchestrate multiple independent Form instances.

Use this skill when the user needs to:

Manage multiple independent forms together
Validate/submit/clear/reset all forms at once
Check validity across all forms
Aggregate values and errors from multiple forms
Build pages composed of separate form sections

Concept

The composer() helper groups multiple Form instances into a single orchestrated object. It provides batch operations: validate all, submit all, clear all, reset all, and check aggregated state.

Import

import { composer } from 'mobx-formkit/lib/composer';

Basic Usage

const forms = composer({
  registration: new RegistrationForm(),
  profile: new ProfileForm(),
});

// Check if all forms are valid
forms.valid(); // true/false

// Validate all at once
forms.validate({ showErrors: true })
  .then(({ valid, errors, values }) => {
    console.log('All valid?', valid);
    console.log('Errors:', errors);
    console.log('Values:', values);
  });

// Submit all at once
forms.submit({ validate: true })
  .then(({ valid, errors, values }) => {
    if (valid) {
      // send aggregated data
    }
  });

// Clear all
forms.clear({ deep: true, execHook: false });

// Reset all
forms.reset({ deep: true, execHook: false });

Composer API

Method	Input	Output	Description
`instances()`	-	object	Get raw object with all Form instances
`select(key)`	string	Form	Select a form by key
`check(prop)`	string	object	Check a computed prop on each form
`get(prop)`	string	object	Get a prop from each form
`valid()`	-	boolean	All forms valid
`error()`	-	boolean	Any form has errors
`clear(opts)`	object	void	Clear all forms
`reset(opts)`	object	void	Reset all forms
`validate(opts)`	object	Promise	Validate all forms
`submit(opts)`	object	Promise	Submit all forms

Read the full file on GitHub · 215 lines

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.

2mo ago First seen · 215 lines · 32 tokens per session scan A 3acd1996bca8

Subscribe to this mod's changes

mobx-formkit-composer is a skill published in the GitHub repository foxhound87/skills (2 stars, last pushed 2mo ago), licensed MIT. It adds 32 tokens to every session and 1,432 once invoked, about $0.0001 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 2026-08-31.

Frontend

mobx-formkit-composer next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
mobx-formkit-composerfoxhound87/skills	Skill	2	2mo ago	MIT	A	32	Claude Code, Codex
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	today	MIT	A	95	Claude Code
next-partial-prefetching-adoptionvercel/next.js	Skill	143k	today	MIT	A	103	Claude Code