Effects are for synchronizing with an external system (non-React UI, network, browser APIs, subscriptions). If nothing outside React is involved—only props, state, and rendering—you usually should not use useEffect. Removing unnecessary Effects simplifies code, cuts extra renders, and avoids bugs. Canonical narrative: [react.dev/learn/you-might-not-need-an-effect](https://react.dev/learn/you-might-not-need-an-effect).
Avoid Effects is a community-contributed Claude Code skill in the content-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/avoid-effects/ and loads when your prompt matches the skill's trigger.
When to invoke it: Use when adding or reviewing `useEffect`—unnecessary effects, effect vs event handler, deriving state in effects, reset state on prop change, fetch in effect, effect chains, race conditions, or "do I need an effect". Triggers on React data-flow and synchronization questions alongside `/react-best-practices`.
The Avoid Effects Claude Code skill is built for content creators, marketers, copywriters, SEO professionals, and editorial teams. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 174,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).
mkdir -p ~/.claude/skills/avoid-effects curl -L https://claudskills.com/skills/avoid-effects/SKILL.md \ -o ~/.claude/skills/avoid-effects/SKILL.md
Or just download SKILL.md directly and drop it into ~/.claude/skills/avoid-effects/. Claude Code auto-discovers it on next session.
Skills live at ~/.claude/skills/avoid-effects/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\avoid-effects\SKILL.md on Windows. See the full install guide for step-by-step instructions.
Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →
The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.
For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.
SKILL.md from the source repository to ~/.claude/skills/avoid-effects/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Avoid Effects is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Content category. Learn more at /learn/what-is-a-claude-skill/.If you reference this skill in a blog post, paper, or documentation, you can cite it as:
@misc{avoid-effects-2026,
author = {Aias},
title = {Avoid Effects [Claude Code skill]},
year = {2026},
publisher = {ClaudSkills},
url = {https://claudskills.com/skills/avoid-effects/}
}Grade A · scanned 2026-08-02 — free static scan against the OWASP Agentic Skills Top 10.
No risk patterns were found in any of the ten OWASP-aligned categories. How grading works ›
Browse all Content skills in the ClaudSkills registry, or explore these other picks from the same category:
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SKILL.md files, not affiliated with, endorsed by, or sponsored by Anthropic.