react-hooks-best-practices SKILL.md skillA
react-hooks-best-practices from majiayu000/spellbook is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add majiayu000/spellbook/react-hooks-best-practices@git:20260523.d39dd11Pins git:20260523.d39dd11 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- majiayu000/spellbook
- Path
skills/react-hooks-best-practices/SKILL.md- Versions recorded
- 1
- Latest version
- git:20260523.d39dd11, committed May 23, 2026
- Size
- 10,715 bytes
- Repository stars
- 290
- License
- MIT
Provides React patterns for hooks, effects, refs, and component design. Covers escape hatches, anti-patterns, and correct effect usage. Use when reading or writing React components with hooks or effects.
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 Hooks Best Practices
## Pair with TypeScript
When working with React, always load both this skill and `typescript-best-practices` together. TypeScript patterns (type-first development, discriminated unions, Zod validation) apply to React code.
## Core Principle: Effects Are Escape Hatches
Effects let you "step outside" React to synchronize with external systems. **Most component logic should NOT use Effects.** Before writing an Effect, ask: "Is there a way to do this without an Effect?"
## When to Use Effects
Effects are for synchronizing with **external systems**:
- Subscribing to browser APIs (WebSocket, IntersectionObserver, resize)
- Connecting to third-party libraries not written in React
- Setting up/cleaning up event listeners on window/document
- Fetching data on mount (though prefer React Query or framework data fetching)
- Controlling non-React DOM elements (video players, maps, modals)
## When NOT to Use Effects
### Derived State (Calculate During Render)
```tsx
// BAD: Effect for derived state
const [firstName, setFirstName] = useState('Taylor');
const [lastName, setLastName] = useState('Swift');
const [fullName, setFullName] = useState('');
…Read the whole file at its exact version.
How to install
mdr add majiayu000/spellbook/react-hooks-best-practices@sha256:9c855f7a8b3575c7The line at the top of this page pins the label git:20260523.d39dd11, 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_e7fsdhtu3m5drmd4)
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Versions
The registry has recorded 1 version of this file, committed on May 23, 2026.
Audit of the latest version
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- pass: Frontmatter declares a description
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- 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
majiayu000/spellbook · 290 stars · license MIT · pushed 2026-11-04 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_e7fsdhtu3m5drmd4 GET https://markdownregistry.com/api/v1/resolve?ref=majiayu000/spellbook/react-hooks-best-practices GET https://markdownregistry.com/api/v1/blob/9c855f7a8b3575c7afdfbcc236d70ce39bafe2844abe5805686ae82e8956dfdd
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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.