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

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.

agentmods
npx agentmods add skills/blunotech-dev/agents/useeffect-cleanup
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.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.svg" alt="Measured on agentmods" 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. Scan, not verified.
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 $0.00051 $0.01565
Opus 5 $0.00026 $0.00783
Sonnet 5 $0.00010 $0.00313
Haiku 4.5 $0.00005 $0.00156

Measured today against content hash 873d7ab623d9, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, 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 today.

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. today 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 3mo ago), with no licence file. It adds 51 tokens to every session and 1,565 once invoked, about $0.0003 per session on Opus 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