no-use-effect

90 / 100 · Low risk

Fine to try. Some of what it can do is expected: a coding skill usually runs build and test commands.

By humanlayer/humanlayer (GitHub) · coding · 12,862 stars · scanned at commit f9bd735

Enforce the no-useEffect rule when writing or reviewing React code. ACTIVATE when writing React components, refactoring existing useEffect calls, reviewing PRs with useEffect, or when an agent adds useEffect "just in case." Provides the five replacement patterns and the useMountEffect escape hatch.

Works with any agent that supports SKILL.md skills.

What this skill can do

Runs commands on your computer

The author does not mention this. Expected for a coding skill.

Found in 1 place.

.claude/skills/no-use-effect/SKILL.md, line 45bun --bun run typecheck -- --filter=<package>

Connects to the internet

The author does not mention this.

Found in 2 places.

.claude/skills/no-use-effect/SKILL.md, line 110**Smell test:** Your effect does `fetch(...)` and then `setState(...)`, or you are re-implementing caching, retries, cancellation, or stale handling.
.claude/skills/no-use-effect/references/you-might-not-need-an-effect.md, line 373`function SearchResults({ query }) { const [page, setPage] = useState(1); const params = new URLSearchParams({ query, page }); const results = useData(`/api/

Install

Paste this into your terminal. It downloads exactly the version we scanned, not whatever is newest.

if [ -e ~/.agents/skills/'no-use-effect' ] || [ -L ~/.agents/skills/'no-use-effect' ]; then echo 'A skill folder named no-use-effect already exists — not replacing it' >&2; false; else d=$(mktemp -d) && git clone --quiet --filter=blob:none --no-checkout 'https://github.com/humanlayer/humanlayer' "$d" && git -C "$d" checkout --quiet 'f9bd73534a9fb7099a274f951b698b1297122fd9' -- '.claude/skills/no-use-effect' && mkdir -p ~/.agents/skills && cp -R "$d"/'.claude/skills/no-use-effect' ~/.agents/skills/'no-use-effect' && rm -rf "$d"; fi

Codex reads ~/.agents/skills directly. For Claude Code, Cursor, Copilot, Gemini CLI, Antigravity or OpenCode, also link it. For Claude Code: ln -s ~/.agents/skills/'no-use-effect' ~/.claude/skills/'no-use-effect' (other agents: ~/.cursor/skills, ~/.copilot/skills, ~/.gemini/skills, ~/.gemini/config/skills, ~/.config/opencode/skills). Or install through the finder skill, which does both.

Badge for your README

The badge for humanlayer/humanlayer shows the score of its lowest-scoring skill.

SkillTrust badge for humanlayer/humanlayer

[![SkillTrust](https://zalavijaysinh.github.io/skilltrust/badges/humanlayer/humanlayer.svg)](https://zalavijaysinh.github.io/skilltrust/repos/humanlayer/humanlayer/)

Score history

Date	Version	Score
2026-11-12	`f9bd735`	90