react-useeffect-review SKILL.md skillA
react-useeffect-review from felvieira/claude-skills-fv is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add felvieira/claude-skills-fv/react-useeffect-review@git:20261011.a095182Pins git:20261011.a095182 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- felvieira/claude-skills-fv
- Path
skills/79-react-useeffect-review/SKILL.md- Versions recorded
- 3
- Latest version
- git:20261011.a095182, committed Oct 11, 2026
- First version recorded
- Sep 23, 2026
- Size
- 5,168 bytes
- Repository stars
- 28
- License
- Apache-2.0
Checklist React para decidir quando não usar useEffect em estado derivado, fetch, sincronização e reset de props. Trigger em: "useEffect", "estado derivado", "race condition no fetch", "sincronizar estado", "resetar estado quando prop muda", "effect chain", "notificar parent via effect", "useSyncExternalStore", "por que renderizou duas vezes".
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# React useEffect — Quando NAO Usar Effects sao uma **valvula de escape** do React: servem pra sincronizar com um sistema externo (DOM nao-React, API do browser, subscription de store externa). Se nao ha sistema externo envolvido, provavelmente nao precisa de Effect — e o codigo com Effect desnecessario tende a rodar em passes extras, causar race condition ou disparar em momentos inesperados (ex: refresh de pagina). Esta skill entra em dois momentos: (1) ao escrever um `useEffect` novo, como checklist antes de commitar; (2) ao revisar codigo/PR que usa `useEffect`, como lente pra achar o antipattern especifico e sugerir a alternativa direta. ## Governanca Global Esta skill segue `GLOBAL.md`, `policies/execution.md`, `policies/handoffs.md`. ## Quando Usar - escrever um `useEffect` novo, como checklist antes de commitar - revisar código/PR que usa `useEffect`, pra achar o antipattern específico - componente renderiza duas vezes de forma inesperada, ou tem race condition em fetch - estado parece sincronizado manualmente quando poderia ser calculado direto ## Quando Nao Usar …
Read the whole file at its exact version.
How to install
mdr add felvieira/claude-skills-fv/react-useeffect-review@sha256:d7fdd6b5e7641cdaThe line at the top of this page pins the label git:20261011.a095182, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_avkg2c5f2t7elifo)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Sep 23, 2026 and Oct 11, 2026, about one every 9 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261011.a095182 latest | 2026-10-11 | a095182 | 5,168 B | A | view · diff |
| git:20260923.71c3dc0 | 2026-09-23 | 71c3dc0 | 5,377 B | A | view · diff |
| git:20260923.19fef73 | 2026-09-23 | 19fef73 | 4,005 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (5168 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
felvieira/claude-skills-fv · 28 stars · license Apache-2.0 · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_avkg2c5f2t7elifo GET https://markdownregistry.com/api/v1/resolve?ref=felvieira/claude-skills-fv/react-useeffect-review GET https://markdownregistry.com/api/v1/blob/d7fdd6b5e7641cdac492c0f946565352798b5889af25aac8b55567b9d7cea2c3
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.