useeffect-cleanup

useeffect-cleanup is a skill for Claude Code, Codex from blunotech-dev/agents. It costs 51 tokens per session (1,565 once invoked), scanned A, original, no licence file.

A React code review guide for checking that useEffect work is properly stopped when it is no longer needed.

In plain words
What is it for?
Use it to check event listeners, subscriptions, timers, network requests, and observers in React components.
Why use it?
It helps prevent memory leaks, duplicate effects, failed requests, and updates to components that have already been removed.

Skill for Claude CodeCodex

Which agent this was written for is unclear — body not stored (licence); the path alone says nothing.

Good fit Use it to check event listeners, subscriptions, timers, network requests, and observers in React components.

Compare 6 skills from other repositories ↓
Install with agentmods
npx agentmods add skills/blunotech-dev/agents/useeffect-cleanup
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Any agent
npx skills add blunotech-dev/agents --skill useeffect-cleanup
Clone the repo
git clone --depth 1 https://github.com/blunotech-dev/agents

Made for: Claude Code, Codex.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

agentmods badge for useeffect-cleanup

README.md
[![agentmods](https://agentmods.dev/badge/skills/blunotech-dev/agents/useeffect-cleanup/github.svg)](https://agentmods.dev/skills/blunotech-dev/agents/useeffect-cleanup)
Your own site
<a href="https://agentmods.dev/skills/blunotech-dev/agents/useeffect-cleanup"><img src="https://agentmods.dev/badge/skills/blunotech-dev/agents/useeffect-cleanup/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

agentmods 80×15 button for useeffect-cleanup

Your own site · 80×15
<a href="https://agentmods.dev/skills/blunotech-dev/agents/useeffect-cleanup"><img src="https://agentmods.dev/badge/skills/blunotech-dev/agents/useeffect-cleanup.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 51 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 1,565 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 1 finding. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5.1 $0.00051 $0.01565
Opus 5.5 $0.00020 $0.00626
Sonnet 5.5 $0.00010 $0.00313
Haiku 4.5 $0.00005 $0.00156

Measured 1mo ago against content hash 873d7ab623d9, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

useeffect-cleanup scanned grade A with 1 finding against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

const res = await fetch(url, { signal: controller.signal });
react/useeffect-cleanup/SKILL.md · 160 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 1mo ago First seen · 160 lines · 51 tokens per session scan A 873d7ab623d9

Subscribe to this mod's changes

useeffect-cleanup is a skill published in the GitHub repository blunotech-dev/agents (2 stars, last pushed 5mo ago), with no licence file. It adds 51 tokens to every session and 1,565 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

Related

Other skills, from other repositories

devtools-react

React adapter for the json-render devtools inspector. Use whenever the user wants to add, configure, or troubleshoot @json-render/devtools-react in a React json-render app, including spec inspection, state editing, action and stream timelines, catalog browsing, or DOM picking.

vercel-labs/json-render · 58 tokens

material-ui-nextjs

Integrates Material UI with Next.js App and Pages routers using @mui/material-nextjs, Emotion cache providers, next/font, CSS layers with Tailwind/CSS Modules, Link component prop patterns, CSS theme variables SSR notes, and App Router useSearchParams + Suspense. Use when setting up or debugging MUI in a Next.js app.

mui/material-ui · 76 tokens

migrate-oxlint

Guide for migrating a project from ESLint to Oxlint. Use when asked to migrate, convert, or switch a JavaScript/TypeScript project's linter from ESLint to Oxlint.

oxc-project/oxc · 44 tokens

inspector-workbench

Runs Inspector UI work on the standalone Threads state lab so the agent can see the overlay. Use when a CopilotKit employee asks an agent to fix, polish, add, or debug Inspector UI, chrome, panes, overlay actions, launcher, Home, Threads, Playground, Memory, or any visual behavior in @copilotkit/web-inspector. Don't…

CopilotKit/CopilotKit · 112 tokens

dev-fix

Unified developer workflow for fixing bugs. Analyzes issue-tracker context, cross-checks docs/code, proposes a solution, implements the fix, verifies locally, and delivers a PR/MR.

HoangNguyen0403/agent-skills-standard · 43 tokens

react-doctor

Diagnose and fix React codebase health issues. Use when reviewing React code, fixing performance problems, auditing security, or improving code quality.

PostHog/posthog-foss · 32 tokens