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.
npx agentmods add skills/ahonn/dotfiles/react-best-practicesnpx skills add ahonn/dotfiles --skill react-best-practicesgit clone --depth 1 https://github.com/ahonn/dotfilesWrote 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/ahonn/dotfiles/react-best-practices)<a href="https://agentmods.dev/skills/ahonn/dotfiles/react-best-practices"><img src="https://agentmods.dev/badge/skills/ahonn/dotfiles/react-best-practices.svg" alt="Measured on agentmods" height="20"></a>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 | $0.00103 | $0.01118 |
| Opus 5 | $0.00051 | $0.00559 |
| Sonnet 5 | $0.00021 | $0.00224 |
| Haiku 4.5 | $0.00010 | $0.00112 |
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 yesterday.
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 — 95 lines — stays where its author put it; the contents beside it link to each section on GitHub.
React Best Practices
Performance patterns and guidelines from react.dev and Vercel Engineering.
Quick Reference (Priority Order)
CRITICAL - Must Follow
| Rule | Impact | Reference |
|---|---|---|
| Avoid unnecessary effects | Render cycles, bugs | effect-pitfalls.md |
| Eliminate waterfalls | First paint, TTI | async-waterfall-elimination.md |
| Parallel data fetching | Load time | async-parallel-requests.md |
| Avoid barrel imports | Bundle size | bundle-barrel-imports.md |
HIGH - Strongly Recommended
| Rule | Impact | Reference |
|---|---|---|
| React Compiler (19+) | Auto memoization | react-compiler.md |
| Dynamic imports | Code splitting | bundle-dynamic-import.md |
| Preload on user intent | Perceived latency | bundle-preload.md |
| Strategic memo() | Render perf | rerender-memo-strategy.md |
| Server caching | Server response | server-cache-patterns.md |
MEDIUM - Recommended
| Rule | Impact | Reference |
|---|---|---|
| State structure | Maintainability | state-structure.md |
| Immutable updates | Avoid mutation bugs | immutable-updates.md |
| Context splitting | Avoid rerenders | rerender-context-splitting.md |
| startTransition | UI responsiveness | rerender-transitions.md |
| Set/Map lookups | O(1) vs O(n) | js-set-map-lookups.md |
| Key patterns | List rendering | rendering-key-patterns.md |
LOW - Nice to Have
| Rule | Impact | Reference |
|---|---|---|
| content-visibility | Long list render | rendering-content-visibility.md |
| Hydration flicker | SSR stability | rendering-hydration-flicker.md |
| Hoist static JSX | Avoid re-creation | rendering-hoist-static-jsx.md |
What ships with it
19 files 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.
- references/async-parallel-requests.md 3.3 KB
- references/async-waterfall-elimination.md 4.4 KB
- references/bundle-barrel-imports.md 3.2 KB
- references/bundle-dynamic-import.md 3.9 KB
- references/bundle-preload.md 2.9 KB
- references/effect-pitfalls.md 5.3 KB
- references/hooks-guide.md 4.3 KB
- references/immutable-updates.md 4.2 KB
- references/js-set-map-lookups.md 4.4 KB
- references/react-compiler.md 5.2 KB
- references/rendering-content-visibility.md 3.9 KB
- references/rendering-hoist-static-jsx.md 3.6 KB
- references/rendering-hydration-flicker.md 4.1 KB
- references/rendering-key-patterns.md 4.9 KB
- references/rerender-context-splitting.md 5.0 KB
- references/rerender-memo-strategy.md 5.4 KB
- references/rerender-transitions.md 4.4 KB
- references/server-cache-patterns.md 4.9 KB
- references/state-structure.md 4.9 KB
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.
- yesterday First seen · 95 lines · 103 tokens per session scan A 9667b78b8abd
react-best-practices is a skill published in the GitHub repository ahonn/dotfiles (62 stars, last pushed 4d ago), licensed MIT. It adds 103 tokens to every session and 1,118 once invoked, about $0.0005 per session on Opus 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 2026-09-03.
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