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Agent Skill

Vercel React Best Practices skill

vercel-react-best-practicesvercel-labs/agent-skillsskills/react-best-practices/SKILL.md

React and Next.js performance optimization guidelines from Vercel Engineering. This skill should be used when writing, reviewing, or refactoring React/Next.js code to ensure optimal performance patterns. Triggers on tasks involving React components, Next.js pages, data fetching, bundle optimization, or performance improvements.

33kMIT

always on

67 tokname + description

once used

1,669 tokSKILL.md body

bundled files

75218 KB

installs

827kskills.sh

Install the Vercel React Best Practices skill

Skills CLI (Claude Code, Codex, Cursor and others)

npx skills add https://github.com/vercel-labs/agent-skills --skill vercel-react-best-practices

Claude Code, by hand (all projects)

git clone --depth 1 https://github.com/vercel-labs/agent-skills.git /tmp/agent-skills
mkdir -p ~/.claude/skills
cp -R /tmp/agent-skills/skills/react-best-practices ~/.claude/skills/vercel-react-best-practices

For one project only, copy the folder into .claude/skills/ in that project instead. The agent picks it up when a task matches its description.

What it costs your context

Agent Skills load in three steps. Tokens counted with the o200k tokenizer; your model's count will differ a little.

WhenWhat loadsCost
Every sessionName and description67 tok
When the agent uses itThe SKILL.md instructions1,669 tok
Only if opened75 bundled files (218 KB)varies

Until it is used, vercel-react-best-practices costs about 20× less than the median MCP server we measured (1,363 tokens on every turn). Installing all 9 skills from vercel-labs/agent-skills would load 623 tokens of descriptions. Skills vs MCP study

Checks

  • The name doesn't match its folder name, as the specification requires.

Checked 2026-10-22 · method

What's inside

The headings of its SKILL.md. Read the full file on GitHub.

  • Vercel React Best Practices
  • When to Apply
  • Rule Categories by Priority
  • Quick Reference
  • 1. Eliminating Waterfalls (CRITICAL)
  • 2. Bundle Size Optimization (CRITICAL)
  • 3. Server-Side Performance (HIGH)
  • 4. Client-Side Data Fetching (MEDIUM-HIGH)
  • 5. Re-render Optimization (MEDIUM)
  • 6. Rendering Performance (MEDIUM)
  • 7. JavaScript Performance (LOW-MEDIUM)
  • 8. Advanced Patterns (LOW)
  • How to Use
  • Full Compiled Document

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