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 skills add bobmatnyc/claude-mpm-skills --skill react-advancedgit clone --depth 1 https://github.com/bobmatnyc/claude-mpm-skillsWrote 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/bobmatnyc/claude-mpm-skills/react-advanced)<a href="https://agentmods.dev/skills/bobmatnyc/claude-mpm-skills/react-advanced"><img src="https://agentmods.dev/badge/skills/bobmatnyc/claude-mpm-skills/react-advanced/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/bobmatnyc/claude-mpm-skills/react-advanced"><img src="https://agentmods.dev/badge/skills/bobmatnyc/claude-mpm-skills/react-advanced.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 | $0.00098 | $0.04640 |
| Opus 5 | $0.00049 | $0.02320 |
| Sonnet 5 | $0.00020 | $0.00928 |
| Haiku 4.5 | $0.00010 | $0.00464 |
Grade A, and why
react-advanced 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 10d 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 — 317 lines — stays where its author put it; the contents beside it link to each section on GitHub.
React Advanced: React 19 Platform & Rendering Architecture
Overview
The reference for React-19-era platform capabilities and rendering architecture. This skill covers the features that reshape how modern React applications are built and optimized: the React Compiler and the end of reflexive manual memoization, concurrent rendering primitives, the use() hook, Actions and the form hooks, the React 19 ergonomic changes (ref as a plain prop, <Context> as provider, native metadata), advanced component-architecture patterns, rendering-performance engineering, and a conceptual treatment of the React Server Component boundary.
This guidance treats React 19 (Dec 2024) and React Compiler 1.0 (stable Oct 2025) as current. Pre-19 memoization advice — wrapping values in useMemo/useCallback/React.memo by reflex — is now an anti-pattern for new code. The compiler memoizes automatically. Authoritative documentation lives at react.dev; this skill distills and applies it rather than restating it.
Boundary Map: What This Skill Does NOT Cover
This skill stays focused on the React-19 platform and rendering architecture. Defer to the owning skill for everything else:
| Topic | Owning skill |
|---|---|
Core hooks tutorial (useState/useEffect/useRef/useMemo/useCallback/useContext), JSX, props/state, lists, controlled inputs |
react-core |
| Advanced custom-hook composition recipes — SWR-backed data hooks, debounced search, memoized-provider value pattern, discriminated-union hook states | react-hooks-composition |
Explicit finite-state-machine modeling with XState v5 (setup(), actors, guards, parallel states) |
react-state-machine |
| Server-state caching, query invalidation, optimistic updates via React Query | tanstack-query |
| Global client state via a store with no providers | zustand |
Framework wiring of Server Components, Server Actions (revalidateTag/revalidatePath), App Router data fetching, caching, Turbopack |
Next.js skills (nextjs-core, nextjs-v16) |
| Docking layout UI (drag-drop panels, splitters) | flexlayout-react |
What ships with it
7 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.
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.
- 10d ago First seen · 317 lines · 98 tokens per session scan A 559684ab739e
react-advanced is a skill published in the GitHub repository bobmatnyc/claude-mpm-skills (74 stars, last pushed 1mo ago), licensed MIT. It adds 98 tokens to every session and 4,640 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 2026-08-30.
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