expert-react-frontend-engineer

expert-react-frontend-engineer is an agent for Claude Code from asleekgeek/claude-multiagent-catalogue. It costs 32 tokens per session (5,833 once invoked), scanned B, original, no licence file.

A React frontend engineering guide for modern React features, TypeScript, and performance work.

In plain words
What is it for?
It is for developing and optimizing React applications, including code that uses TypeScript and React's server-side features.
Why use it?
It helps developers reason about newer React patterns, including hooks, Server Components, and Actions, when building user interfaces.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit It is for developing and optimizing React applications, including code that uses TypeScript and React's server-side features.

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Install with agentmods
npx agentmods add agents/asleekgeek/claude-multiagent-catalogue/expert-react-frontend-engineer
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/asleekgeek/claude-multiagent-catalogue

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 expert-react-frontend-engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/asleekgeek/claude-multiagent-catalogue/expert-react-frontend-engineer.svg)](https://agentmods.dev/agents/asleekgeek/claude-multiagent-catalogue/expert-react-frontend-engineer)
Your own site
<a href="https://agentmods.dev/agents/asleekgeek/claude-multiagent-catalogue/expert-react-frontend-engineer"><img src="https://agentmods.dev/badge/agents/asleekgeek/claude-multiagent-catalogue/expert-react-frontend-engineer.svg" alt="Measured on agentmods" height="20"></a>
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 5,833 The whole file, excluding the scripts and references it only reads on demand.
Security scan B 2 findings. A grade says what 26 rules found in the file — not that it is safe.
Origin unknown 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 $0.00032 $0.05833
Opus 5 $0.00016 $0.02916
Sonnet 5 $0.00006 $0.01167
Haiku 4.5 $0.00003 $0.00583

Measured 4d ago against content hash f73ac1d3db77, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade B, and why

expert-react-frontend-engineer scanned grade B with 2 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 4d 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.

Sends data to an external URLmediumData exfiltration

A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.

const res = await fetch("https://api.example.com/posts", { method: "POST",

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

const response = await fetch(url);
agents/expert-react-frontend-engineer.md · 744 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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. 4d ago First seen · 744 lines · 32 tokens per session scan B f73ac1d3db77

Subscribe to this mod's changes

expert-react-frontend-engineer is an agent published in the GitHub repository asleekgeek/claude-multiagent-catalogue (2 stars, last pushed 3mo ago), with no licence file. It adds 32 tokens to every session and 5,833 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it B with 2 findings (sends data to an external url, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-03.

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