react-expert

react-expert is an agent for Claude Code from ashrafmusa/agenticana. It costs 37 tokens per session (210 once invoked), scanned A, original, MIT.

A specialized coding agent for React, Next.js, and modern front-end projects. React is a JavaScript library for building user interfaces, and Next.js is a framework built around React.

In plain words
What is it for?
Use it to build or review React and Next.js interfaces, including state management, server and client components, accessibility, and front-end quality checks.
Why use it?
It brings focused guidance for component structure, hooks, data loading, performance, accessibility, responsive layouts, tests, and error handling.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md).

Good fit Use it to build or review React and Next.js interfaces, including state management, server and client components, accessibility, and front-end quality checks.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/ashrafmusa/agenticana/react-expert
Install

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.

Clone the repo
git clone --depth 1 https://github.com/ashrafmusa/agenticana

Made for: Claude Code.

Wrote 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.

agentmods badge for react-expert

README.md
[![agentmods](https://agentmods.dev/badge/agents/ashrafmusa/agenticana/react-expert/github.svg)](https://agentmods.dev/agents/ashrafmusa/agenticana/react-expert)
Your own site
<a href="https://agentmods.dev/agents/ashrafmusa/agenticana/react-expert"><img src="https://agentmods.dev/badge/agents/ashrafmusa/agenticana/react-expert/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.

agentmods 80×15 button for react-expert

Your own site · 80×15
<a href="https://agentmods.dev/agents/ashrafmusa/agenticana/react-expert"><img src="https://agentmods.dev/badge/agents/ashrafmusa/agenticana/react-expert.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 37 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 210 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00037 $0.00210
Opus 5.5 $0.00015 $0.00084
Sonnet 5.5 $0.00007 $0.00042
Haiku 4.5 $0.00004 $0.00021

Measured 1mo ago against content hash bdcd8aa83094, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

react-expert 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.

agents/react-expert.md · 23 lines

What it actually says

React Expert Agent ⚛️

You are a senior React developer. Your goal is to build highly performant, accessible, and maintainable frontend applications.

Core Rules

  1. Hooks First: Use functional components and hooks unconditionally.
  2. Performance: Avoid unnecessary re-renders (useMemo/useCallback where appropriate).
  3. Architecture: Favor "Composition over Inheritance".
  4. Data Fetching: Use Server Components for initial data and Client Components for interactivity.

Quality Gate

  • Accessibility (ARIA/Semantic HTML)
  • Responsive Design
  • Unit tests for business logic
  • Proper error boundaries
Changes

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.

  1. 1mo ago First seen · 23 lines · 37 tokens per session scan A bdcd8aa83094

Subscribe to this mod's changes

react-expert is an agent published in the GitHub repository ashrafmusa/agenticana (2 stars, last pushed 5d ago), licensed MIT. It adds 37 tokens to every session and 210 once invoked, about $0.0001 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 2026-08-31.

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