React Router V7

What it does

When your agent uses it

• Building file-based routes with loaders/actions
• Handling form submissions with Form/useFetcher/useSubmit
• Adding route ErrorBoundary components
• Revalidating data after mutations

Example prompts

• “/react-router-v7”

Workflow steps

7 steps, taken from the first numbered list in SKILL.md.

1. 1Create the route file — Add a file under app/routes/ (or your configured routes directory) for the URL segment, using nested folders/files…
2. 2Export a loader — Fetch the data the route needs before render; validate route params and search params at the top of the loader.
3. 3Export a component — Read loader data via useLoaderData() and render UI; keep the component focused on presentation.
4. 4Export an action — Handle POST/PUT/DELETE submissions from or useFetcher`; return typed data (including validation errors) instead of…
5. 5Export an ErrorBoundary — Handle thrown errors (400s, 500s, unexpected exceptions) locally so one route's failure doesn't take down the…
6. 6Wire up navigation — Use , useFetcher, and useSubmit` for mutations so the app works with JavaScript disabled and gets optimistic UI when…
7. 7Test the module — Write tests for the loader, action, validation failures, and error boundary independently of the rendered component tree.

What it can do on your machine

Read from SKILL.md and the folder at commit 9718410. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are typescript).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

React Router V7 loads about 2k tokens when it runs. Until then it costs about 95 tokens; SKILL.md has 760 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~95

When it runs · the whole SKILL.md, loaded when a task matches

~2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from Mindrally/skills at commit 9718410, republished under its Apache-2.0 licence (© Mindrally). 760 words, ~1,970 tokens.

name

react-router-v7

description

React Router v7 framework mode conventions for route modules, data loaders, actions, and progressive enhancement. Use when building file-based routes with loaders/actions, handling form submissions with Form/useFetcher/useSubmit, adding route ErrorBoundary components, revalidating data after mutations, or migrating Remix-style route modules to React Router v7.

// app/routes/posts.$postId.tsx
import { Form, useLoaderData, useNavigation } from "react-router";
import type { Route } from "./+types/posts.$postId";
import { getPost, updatePost } from "~/services/posts.server";

export async function loader({ params }: Route.LoaderArgs) {
  const post = await getPost(params.postId);
  if (!post) {
    throw new Response("Not Found", { status: 404 });
  }
  return { post };
}

export async function action({ request, params }: Route.ActionArgs) {
  const formData = await request.formData();
  const title = String(formData.get("title") ?? "");

  if (title.trim().length === 0) {
    return { ok: false as const, errors: { title: "Title is required" } };
  }

  await updatePost(params.postId, { title });
  return { ok: true as const, errors: null };
}

export default function PostDetail() {
  const { post } = useLoaderData<typeof loader>();
  const navigation = useNavigation();
  const isSubmitting = navigation.state === "submitting";

  return (
    <Form method="post">
      <input name="title" defaultValue={post.title} />
      <button type="submit" disabled={isSubmitting}>
        {isSubmitting ? "Saving..." : "Save"}
      </button>
    </Form>
  );
}

export function ErrorBoundary({ error }: Route.ErrorBoundaryProps) {
  if (error instanceof Response && error.status === 404) {
    return <p>Post not found.</p>;
  }
  return <p>Something went wrong loading this post.</p>;
}

// Optimistic UI with useFetcher
function LikeButton({ postId, liked }: { postId: string; liked: boolean }) {
  const fetcher = useFetcher();
  const optimisticLiked = fetcher.formData
    ? fetcher.formData.get("liked") === "true"
    : liked;

  return (
    <fetcher.Form method="post" action={`/posts/${postId}/like`}>
      <input type="hidden" name="liked" value={String(!optimisticLiked)} />
      <button type="submit">{optimisticLiked ? "Unlike" : "Like"}</button>
    </fetcher.Form>
  );
}

© Mindrally, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

Just SKILL.md in react-router-v7 of Mindrally/skills.

Open the folder on GitHubat commit 9718410