Tanstack Start

What it does

When your agent uses it

• Next.js migration
• Encountering hydration
• Data pattern errors

Example prompts

• “/tanstack-start”

Requirements

• A Bash shell
• Pre-approved tools (allowed-tools): Bash, Read, Write, Edit

What it can do on your machine

Read from SKILL.md and the folder at commit 8837836. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves these tools, so the agent can use them without asking each time:

  • Bash
  • Read
  • Write
  • Edit

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  Ships 1 file in scripts/ (Shell), which the agent can run.

  Shell commands in SKILL.md call:

  • npm
  • curl

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

• Network

  No URLs in SKILL.md. Its commands use npm and curl, which can reach the network depending on how they are called.

  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

Tanstack Start loads about 1.6k tokens when it runs, and up to ~6.1k if it reads all its reference files. Until then it costs about 49 tokens; SKILL.md has 576 words of instructions outside code blocks.

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

~49

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

~1.6k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~6.1k

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

• NotePre-approves every shell command (allowed-tools: Bash)SKILL.md

  allowed-tools: Bash, Read, Write, Edit

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); the scripts in this folder are not scanned.

SKILL.md

The full file from secondsky/claude-skills at commit 8837836, republished under its MIT licence (© secondsky). 576 words, ~1,642 tokens.

name

tanstack-start

description

TanStack Start (RC) full-stack React with server functions, SSR, Cloudflare Workers. Use for Next.js migration, edge rendering, or encountering hydration, auth, data pattern errors.

allowed-tools

Bash, Read, Write, Edit

license

MIT

metadata.version

1.0.0-rc.1

metadata.author

Claude Skills Maintainers

metadata.last-verified

2025-12-09

metadata.production-tested

false

metadata.status

rc

metadata.keywords

tanstack start, tanstack react start, full-stack react, selective ssr, spa mode, static prerender, server functions, server routes, cloudflare workers, edge…

npm create @tanstack/start@latest my-app
cd my-app
npm run dev

// app/routes/posts.$postId.tsx
import { createFileRoute, redirect } from '@tanstack/react-router'
import { z } from 'zod'

export const Route = createFileRoute('/posts/$postId')({
  validateSearch: z.object({ preview: z.boolean().optional() }),
  ssr: 'data-only',
  loader: async ({ params, search, context }) => {
    const post = await context.queryClient.ensureQueryData(['post', params.postId], () =>
      fetch(`/api/posts/${params.postId}?preview=${!!search.preview}`).then(r => r.json())
    )
    if (!post.published && !search.preview) throw redirect({ to: '/drafts' })
    return { post }
  },
})

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

Files

SKILL.md and 9 other files (scripts, references) in plugins/tanstack-start/skills/tanstack-start of secondsky/claude-skills.

• SKILL.md
• references/cloudflare-hosting-and-env.md
• references/devtools-and-llm-support.md
• references/execution-and-auth.md
• references/navigation-and-preloading.md
• references/quickstart-and-layout.md
• references/rendering-modes.md
• references/routing-and-data-loading.md
• references/server-functions-and-middleware.md
• scripts/bootstrap-cloudflare-start.sh

Open the folder on GitHubat commit 8837836