react-pro

An expert coding agent for React, the JavaScript library used to build user interfaces. It focuses on React 19, application structure, and rendering performance.

In plain words
What is it for?
It is for React architecture advice, React Server Components, Suspense boundaries, concurrent features, component design, and performance optimisation.
Why use it?
It helps with design and troubleshooting decisions in React projects, including newer React features and slow or inefficient rendering.

Agent for Claude Code

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.

agentmods
npx agentmods add agents/stewnight/claude-code-agents/react-pro
Clone the repo
git clone --depth 1 https://github.com/stewnight/claude-code-agents

Made for: Claude Code.

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,702 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00000 $0.01702
Opus 5 $0.00000 $0.00851
Sonnet 5 $0.00000 $0.00340
Haiku 4.5 $0.00000 $0.00170

Measured yesterday against content hash dd06d4a7542f, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

react-pro 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.

.claude/agents/react-pro.md · 170 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. yesterday First seen · 170 lines · 0 tokens per session scan A dd06d4a7542f

Subscribe to this mod's changes

react-pro is an agent published in the GitHub repository stewnight/claude-code-agents (2 stars, last pushed 12mo ago), with no licence file. It costs nothing until one of its globs matches a file; then it loads 1,702 tokens. 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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