Context7 Documentation Fetching

This skill enables fetching up-to-date, version-specific documentation directly from official sources.

Problem Solved

LLMs have stale training data. When working with Next.js 15, React 19, or any library that evolved since the model's cutoff date, you get:

• Hallucinated APIs that don't exist
• Deprecated patterns
• Outdated code examples

When to Use

• Working with any framework/library (React, Next.js, Vue, Astro, Tailwind, etc.)
• Need current official documentation
• Want accurate code examples
• Encountering unfamiliar APIs
• Starting a new project with latest versions

How to Activate

Simply include "use context7" in your prompt:

use context7 でNext.js 15のApp Routerについて教えて

use context7 React 19の新機能を使ってコンポーネントを作って

Available Tools

1. resolve-library-id

Converts library name to Context7 ID.

Input: "next.js"
Output: "/vercel/next.js/v15.0.0"

2. get-library-docs

Fetches documentation chunks and code examples.

Parameters:

• context7_id: Library ID from resolve-library-id
• topic (optional): Specific topic to filter
• tokens (optional): Max tokens (default 5000)

Example Usage

Basic Documentation Fetch

User: use context7 でReact 19のuseActionStateの使い方を教えて

AI: [Calls resolve-library-id with "react"]
    [Calls get-library-docs with topic "useActionState"]
    [Returns current, accurate documentation]

Framework Setup

User: use context7 で最新のAstro 5プロジェクトをセットアップして

AI: [Fetches current Astro 5 documentation]
    [Provides accurate setup commands and configuration]

Supported Libraries

Context7 supports documentation from major frameworks and libraries:

Category	Libraries
Frontend	React, Vue, Svelte, Angular, Solid
Meta-frameworks	Next.js, Nuxt, Astro, Remix, SvelteKit
Styling	Tailwind CSS, CSS-in-JS libraries
State	Redux, Zustand, Jotai, Recoil
Testing	Jest, Vitest, Playwright, Cypress
Backend	Express, Fastify, Hono, tRPC
Database	Prisma, Drizzle, TypeORM
Build	Vite, esbuild, webpack, turbopack

Best Practices

1. Always use for rapidly evolving frameworks

   • Next.js (major updates frequently)
   • React (new features in v19)
   • Tailwind (v4 breaking changes)

2. Specify version when needed

   use context7 Next.js 15.1の新機能
   

3. Combine with specific topics

   use context7 Prismaのリレーション設定
   

4. Use for debugging

   use context7 このエラーはReact 19で解決されてる？
   

Integration with TAISUN

Context7 is automatically available via MCP. No additional setup required.

When you include "use context7" or work with framework-specific tasks, the system will:

1. Detect the library/framework
2. Resolve the Context7 ID
3. Fetch relevant documentation
4. Provide accurate, current information

Source

• Context7 GitHub
• Upstash Blog