V8 JIT optimization patterns for writing high-performance JavaScript in Next.js server internals. Use when writing or reviewing hot-path code in app-render, stream-utils, routing, caching, or any per-request code path. Covers hidden classes / shapes, monomorphic call sites, inline caches, megamorphic deopt, closure allocation, array packing, and profiling with --trace-opt / --trace-deopt.
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Read and follow the shared turbo_tasks caching and invalidation guidance. Those turbo_tasks rules also apply throughout crates/ and all its subdirectories when developing with turbo_tasks.
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Before any Next.js work, find and read the relevant doc in app/node_modules/next/dist/docs/. Your training data is outdated — the docs are the source of truth.
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Set permissions: {} at the workflow level and grant the minimum needed per-job. Prefer GitHub-provided (actions/*) and Vercel-owned actions. For third-party actions: ${{ ... }} is interpolated into the script before bash runs, so untrusted values (PR title, branch name, issue body) can break out and execute. Route them through an env var and quote on use:
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This version has breaking changes — APIs, conventions, and file structure may all differ from your training data. Read the relevant guide in dist/docs/ before writing any code. Heed deprecation notices.
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Audit and reduce Next.js browser initial-load work. Use for slow route startup, oversized client bundles, duplicate browser dependencies, or features that can wait for interaction.
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Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the `cacheComponents` flag, work through a flood of blocking-prerender / instant validation errors, run the `cache-components-instant-false` codemod, or decide between opting routes out with `export const instant = false` and fixing them in place.
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Optimize the meaningful UI available immediately from a Next.js route on an initial load (hard navigation) or named client-side navigation (soft navigation). Encode the goal as a failing @next/playwright instant() e2e and work it to green, one verified route and entry point at a time; the shipped test then guards against regression. Use when asked to grow a static shell, fix a slow first paint or non-instant navigation, diagnose which Suspense boundary blocks useful UI, or add instant() regression coverage. Requires Next.js 16.3+ with Cache Components already adopted.
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Verify Next.js runtime behavior after editing app code. Use this skill to confirm a change actually works in a running app — not just that it compiles or type-checks. Combines /_next/mcp (Next.js's view) with agent-browser (the browser's view). Requires a running `next dev`.
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Turn on Partial Prefetching in a Next.js app and work through the insights it surfaces. Use when the user wants to enable or adopt Partial Prefetching, flip the `partialPrefetching` flag, opt routes in with `export const prefetch = 'partial'`, audit `Link prefetch={true}` behavior, preserve existing prefetched UI with `instant()` tests, or resolve the instant-link-prefetch-partial and instant-shell-url-data insights.
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Optimize what selected Next.js client navigations include before the click under Partial Prefetching. Use after Cache Components and Partial Prefetching are adopted when the user wants selected URL-specific UI to be instant, wants reusable content to wait for navigation, or needs to choose between default, viewport, and intent prefetching. Requires Next.js 16.3+.
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All newly created e2e tests must work with Cache Components both enabled and disabled. The test infrastructure runs both variants. In the enabled variant, __NEXT_CACHE_COMPONENTS=true enables Cache Components even when the fixture's next.config does not declare cacheComponents. - Write fixtures that conform to Cache Components rules by default: put uncached or request-time work behind appropriate <Suspense> boundaries, and use "use cache" for work that should be cached. Preserve what the test is intended to cover when adapting the fixture. -…
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Turbopack is a general-purpose bundler that is built and designed for Next.js, but is not necessarily Next.js-specific. Keep Next.js concepts out of it. These rules apply throughout this directory tree when developing with turbo_tasks:
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Plain text files in a repository that tell a coding agent how the project works: commands to run, conventions to follow and things to avoid. CLAUDE.md, AGENTS.md, cursor rules and skills are the common kinds.
CLAUDE.md or AGENTS.md?
CLAUDE.md is read by Claude Code. AGENTS.md is an open format that Codex, Cursor and other agents read. Many projects keep one and point the other at it.
What is a skill?
A folder with a SKILL.md that describes one capability, such as filling PDFs or reviewing code. The agent loads it only when the task calls for it.
Can I search my own team's files too?
Your agents already can, over MCP, limited to the files you're allowed to read. Searching them from this page is coming.
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