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React Best Practices · velcrafting | DecimalAI

frontendby velcrafting

React Best Practices

velcrafting/react-best-practices

Source velcrafting/codex-skills ↗License Not recorded

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.

SkillScore95Maintained

Automatic

Frontend / UI pack

Last verified 8/3/2026

What it changes

Passed 21 of 22 test cases with the skill, and 18 of 22 without it.

Without skill82%

With skill95%

Checks it passed that the model alone missed

Recommends using an LRU cache for cross-request caching on the server
Recommends using an explicit ternary operator construct instead of logical AND operator
Recommends importing utility functions or components directly from their specific module paths instead of barrel file exports

3 fixed18 passed either way1 still failing0 broke

Pass-rate lift: +14 pp
Tokens: +12%
Agent turns: 0%
Response time: -29%

Model gemini-3.6-flashMeasured 8/3/2026v121 of 22 cases passed with skill

Tokens, turns and time describe resource use, not a dollar price.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/velcrafting-react-best-practices/SKILL.md https://app.decimal.ai/s/velcrafting-react-best-practices/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add velcrafting-react-best-practices, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/velcrafting-react-best-practices/ and pins it in .decimal/skills.lock

decimalai skills add velcrafting-react-best-practices

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/velcrafting-react-best-practices/SKILL.md https://app.decimal.ai/s/velcrafting-react-best-practices/SKILL.md

Raw file: /s/velcrafting-react-best-practices/SKILL.md ↗ · machine-readable summary at /s/velcrafting-react-best-practices.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 3 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 3

Prompt

In our React JSX component, we render a badge list count using `{items.length && <Badge count={items.length} />}`. When `items` is empty (`[]`), the UI renders the number `0` on screen. How should this JSX conditional expression be written?

What was checked, without and with the skill
Checked	Without skill	With skill
Recommends using an explicit ternary operator construct instead of logical AND operator	Missed	Passed

case-14 · gemini-3.6-flash · 8/3/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md101 lines2 files

React Best Practices

Overview

Comprehensive performance optimization guide for React and Next.js applications, containing 40+ rules across 8 categories. Rules are prioritized by impact to guide automated refactoring and code generation.

When to Apply

Reference these guidelines when:

Writing new React components or Next.js pages
Implementing data fetching (client or server-side)
Reviewing code for performance issues
Refactoring existing React/Next.js code
Optimizing bundle size or load times

Priority-Ordered Guidelines

Rules are prioritized by impact:

Priority	Category	Impact
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

Quick Reference

Critical Patterns (Apply First)

Eliminate Waterfalls:

Defer await until needed (move into branches)
Use Promise.all() for independent async operations
Start promises early, await late
Use better-all for partial dependencies
Use Suspense boundaries to stream content

Track record

Benchmark

21 / 22

test cases passed, vs 18 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v4 — 8/1/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

velcrafting / codex-skills

skills/vercel/react-best-practices/SKILL.md

View on GitHub ↗

Imported 8/1/2026Version v1Bundled 1 file

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Published skills whose descriptions closely match this one, with their headline benchmark lift.

More skills from the same source and nearby in the registry, with their headline benchmark lift.

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See it in action

What's inside

React Best Practices

Overview

When to Apply

Priority-Ordered Guidelines

Quick Reference

Critical Patterns (Apply First)

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills