What is shadcn-inertia?

A guide for using shadcn/ui interface components with Inertia.js, Rails, and React. It explains how these patterns differ from the usual Next.js examples.

It helps adapt forms, links, page titles, routing, themes, and validation by using Inertia equivalents instead of Next.js or react-hook-form patterns.

It prevents developers from copying Next.js instructions that do not fit Inertia applications.

shadcn-inertia — Skill for Claude Code and Codex by thecodingend

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 thecodingend/rails-starter --skill shadcn-inertia

Clone the repo

git clone --depth 1 https://github.com/thecodingend/rails-starter

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/thecodingend/rails-starter/shadcn-inertia/github.svg)](https://agentmods.dev/skills/thecodingend/rails-starter/shadcn-inertia)

Your own site

<a href="https://agentmods.dev/skills/thecodingend/rails-starter/shadcn-inertia"><img src="https://agentmods.dev/badge/skills/thecodingend/rails-starter/shadcn-inertia/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/thecodingend/rails-starter/shadcn-inertia"><img src="https://agentmods.dev/badge/skills/thecodingend/rails-starter/shadcn-inertia.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 95 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,862 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 100% copy Near-identical to another mod 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	$0.00095	$0.01862
Opus 5.5	$0.00038	$0.00745
Sonnet 5.5	$0.00019	$0.00372
Haiku 4.5	$0.00010	$0.00186

Measured 2mo ago against content hash 11e779f05ee4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

shadcn-inertia 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.

Origin

This is a copy

100% identical to shadcn-inertia — 0 lines differ, which has more behind it and is treated as the original. This page carries a canonical link to it rather than competing with it.

.agents/skills/shadcn-inertia/SKILL.md · 178 lines

How it starts

The opening of the file, as written. The whole thing — 178 lines — stays where its author put it; the contents beside it link to each section on GitHub.

shadcn/ui for Inertia Rails

shadcn/ui patterns adapted for Inertia.js + Rails + React. NOT Next.js.

Before using a shadcn example, ask:

Does it use react-hook-form + zod? → Replace with Inertia <Form> + name attributes. Inertia handles CSRF, errors, redirects, processing state — react-hook-form would fight all of this.
Does it use 'use client'? → Remove it. Inertia has no RSC — all components are client components.
Does it use next/link, next/head, useRouter()? → Replace with Inertia <Link>, <Head>, router.

Key Differences from Next.js Defaults

shadcn default (Next.js)	Inertia equivalent
`'use client'` directive	Remove — not needed (no RSC)
`react-hook-form` + `zod`	Inertia `<Form>` component
`FormField`, `FormItem`, `FormMessage`	Plain `<Input name="...">` + `errors.field`
`next-themes`	CSS class strategy + `@custom-variant`
`useRouter()` (Next)	`router` from `@inertiajs/react`
`next/link`	`<Link>` from `@inertiajs/react`
`next/head`	`<Head>` from `@inertiajs/react`

NEVER use shadcn's FormField, FormItem, FormLabel, FormMessage components — they depend on react-hook-form's useFormContext internally and will crash without it. Use plain shadcn Input/Label/Select with name attributes inside Inertia <Form>, and render errors from the render function's errors object (see examples below).

Setup

npx shadcn@latest init. add @/ resolve aliases to tsconfig.json if not present, Do NOT add @/ resolve aliases to vite.config.ts — vite-plugin-ruby already provides them.

shadcn Inputs in Inertia `<Form>`

Use plain shadcn Input/Label/Button with name attributes inside Inertia <Form>. See inertia-rails-forms skill for full <Form> API — this section covers shadcn-specific adaptation only.

The key pattern: Replace shadcn's FormField/FormItem/FormMessage with plain components + manual error display:

Read the full file on GitHub · 178 lines

Files

What ships with it

2 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.

2mo ago First seen · 178 lines · 95 tokens per session scan A 11e779f05ee4

Subscribe to this mod's changes

shadcn-inertia is a skill published in the GitHub repository thecodingend/rails-starter (5 stars, last pushed 2mo ago), licensed MIT. It adds 95 tokens to every session and 1,862 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 0 findings. It is 100% identical to shadcn-inertia, differing in 0 lines, and is treated as a copy.

CSS and styling Frontend React

shadcn-inertia next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
shadcn-inertiathecodingend/rails-starter	Skill	5	2mo ago	MIT	A	95	Claude Code, Codex
chakra-ui-builderchakra-ui/chakra-ui	Skill	41k	yesterday	MIT	A	214	Claude Code, Codex
ui-checkstyleopen-metadata/OpenMetadata	Skill	16k	yesterday	Apache-2.0	A	122	Claude Code
tamagui-v6-configtamagui/tamagui	Skill	14k	today	MIT	A	0	Claude Code, Codex
tamagui-theme-generatortamagui/tamagui	Skill	14k	today	MIT	A	48	Claude Code, Codex
frontend-ui-dark-tsmicrosoft/skills	Skill	3.2k	yesterday	MIT	A	48	Claude Code
building-landing-homelobehub/lobe-icons	Skill	2.7k	3d ago	MIT	A	121	Claude Code, Codex