Borrowing it
Nothing to install: this file belongs to incubateur-ademe/benefriches. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/incubateur-ademe/benefriches/main/.agents/skills/react-best-practices/SKILL.mdgit clone --depth 1 https://github.com/incubateur-ademe/benefrichesWrote 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.
[](https://agentmods.dev/skills/incubateur-ademe/benefriches/react-best-practices)<a href="https://agentmods.dev/skills/incubateur-ademe/benefriches/react-best-practices"><img src="https://agentmods.dev/badge/skills/incubateur-ademe/benefriches/react-best-practices/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.
<a href="https://agentmods.dev/skills/incubateur-ademe/benefriches/react-best-practices"><img src="https://agentmods.dev/badge/skills/incubateur-ademe/benefriches/react-best-practices.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00053 | $0.02880 |
| Opus 5.5 | $0.00021 | $0.01152 |
| Sonnet 5.5 | $0.00011 | $0.00576 |
| Haiku 4.5 | $0.00005 | $0.00288 |
Grade A, and why
react-best-practices scanned grade A with 0 findings 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.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 362 lines — stays where its author put it; the contents beside it link to each section on GitHub.
React Best Practices for Benefriches
Guidelines for React 19+ SPA with Vite + Redux
Philosophy: Code quality and maintainability first, performance optimization when measured
Adapted for: Client-side rendering with Redux + Clean Architecture
When to Apply This Skill
Use these practices when:
- Writing new React components
- Designing component architecture
- Implementing Redux patterns (reducers, selectors, thunks)
- Reviewing code for quality or performance issues
- Refactoring existing React code
- Debugging slow interactions
Categories by Priority
| Priority | Category | Focus Area |
|---|---|---|
| 🔴 | Code Quality | Readability, maintainability, SRP |
| 🟠 | Component Patterns | Container/Presentational, composition |
| 🟡 | State Management | Local-first, derived state, colocation |
| 🟢 | Anti-Patterns | Common mistakes to avoid |
| 🔵 | Bundle Optimization | Lazy loading, dynamic imports |
| 🟣 | Async Patterns | Parallel fetching, Suspense |
| 🟤 | Form Handling | react-hook-form patterns, DSFR |
| ⬜ | Accessibility | Keyboard nav, ARIA, focus management |
| ⬛ | Error Boundaries | Catch errors, prevent app crashes |
| ⚫ | Performance (Measure!) | Only when needed, after profiling |
| ⚪ | React 19 & Future | React Compiler, new APIs |
🔴 CRITICAL: Code Quality & Readability
| Practice | Description |
|---|---|
| Single Responsibility | Each component does ONE thing well |
| Component Size | Keep components focused (< 200 lines) |
| Descriptive Naming | Clear names for components, hooks, props |
| Props Destructuring | Improve readability at function signature |
| Explicit over Implicit | Avoid magic values, use named constants |
| Extract Custom Hooks | Share logic via hooks, not copy-paste |
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago Changed 359c77e5d7bc
- 1mo ago Changed f7b3e5677470
- 2mo ago First seen · 362 lines · 53 tokens per session scan A 6906f88ee027
react-best-practices is a skill published in the GitHub repository incubateur-ademe/benefriches (45 stars, last pushed today), licensed MIT. It adds 53 tokens to every session and 2,880 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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