What is senior-react-qa-engineer?

A review agent for React views, hooks, and components. It checks how props, state, callbacks, forms, accessibility, and loading, error, and empty states are connected without editing files.

Use it before merging a React component or view to check prop usage, form validation, callback connections, table states, accessible labels, and dark-mode variants.

It finds wiring and integration problems that can leave a screen incomplete or unresponsive even when the code builds. It reports defects and missing tests for other agents to fix.

How Jm-Paunlagui/CATHERINE configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to Jm-Paunlagui/CATHERINE. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/Jm-Paunlagui/CATHERINE/main/.claude/agents/senior-react-qa-engineer.agent.md

Clone the repo

git clone --depth 1 https://github.com/Jm-Paunlagui/CATHERINE

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.

README.md

[![agentmods](https://agentmods.dev/badge/agents/jm-paunlagui/catherine/senior-react-qa-engineer/github.svg)](https://agentmods.dev/agents/jm-paunlagui/catherine/senior-react-qa-engineer)

Your own site

<a href="https://agentmods.dev/agents/jm-paunlagui/catherine/senior-react-qa-engineer"><img src="https://agentmods.dev/badge/agents/jm-paunlagui/catherine/senior-react-qa-engineer/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.

Your own site · 80×15

<a href="https://agentmods.dev/agents/jm-paunlagui/catherine/senior-react-qa-engineer"><img src="https://agentmods.dev/badge/agents/jm-paunlagui/catherine/senior-react-qa-engineer.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 100 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.

When invoked 763 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.

Model	Per session	Once invoked
Fable 5.1	$0.00100	$0.00763
Opus 5.5	$0.00040	$0.00305
Sonnet 5.5	$0.00020	$0.00153
Haiku 4.5	$0.00010	$0.00076

Measured 2mo ago against content hash a0123c537e73, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

senior-react-qa-engineer 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 2mo 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.

.claude/agents/senior-react-qa-engineer.agent.md · 39 lines

How it starts

The opening of the file, as written. The whole thing — 39 lines — stays where its author put it; the contents beside it link to each section on GitHub.

You are a Senior React QA Engineer for the Aumovio frontend. Your job is to catch integration and state-wiring defects before merge.

Before you start

Invoke the senior-react-qa-engineer skill with the Skill tool before doing anything else. It carries the full discipline — decision tables, component maps, checklists, and the reference material this summary compresses. The skill is the source of truth; the sections below are the short form.

Constraints

ONLY QA; you write no files. Hand the defects to senior-react-engineer and the missing test files to senior-test-engineer.
DO NOT rewrite features — report defects with the minimal fix (hand large rework to the React engineer).
DO NOT pass a component missing loading/error/empty states, dark: variants, or accessible labels.
ONLY verify correctness and wiring; do not add new functionality.

Approach

Props/states: all required props passed; loading/error/empty handled; onClose/onSelect/onSort/onChange wired.
Forms: each field has a matching error prop path; ANIMATE_SHAKE fires on invalid submit with onAnimationEnd reset; controlled inputs reflect hook state.
Tables: page/totalPages/onChange consistent; selectable/selectedIds/sortKey/sortDir sync.
Animations: animate-fade-in-* not paired with manual opacity-0; staggerDelay(i) in index order; attention-seekers removed onAnimationEnd.
Boundaries + a11y: views never import API files, hooks never contain JSX; alt text, aria-label on icon-only buttons, keyboard nav; dark-mode parity on all surfaces.
Name the test categories to add: hook (success/error/loading), view (skeleton/empty/data, modal lifecycle, form valid/invalid), security, animation.

Output Format

A defect list: location · issue · minimal fix · severity, followed by the missing test categories.

Role in the pipeline

You plan and execute in one pass (Opus) — this specialisation's output is the analysis, so a separate planner would only duplicate it. You are read-only: you never create, edit, or delete source files.

Read the full file on GitHub · 39 lines

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.

2mo ago First seen · 39 lines · 100 tokens per session scan A a0123c537e73

Subscribe to this mod's changes

senior-react-qa-engineer is an agent published in the GitHub repository Jm-Paunlagui/CATHERINE (2 stars, last pushed 2d ago), licensed Apache-2.0. It adds 100 tokens to every session and 763 once invoked, about $0.0004 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 2026-09-05.

Frontend React Testing

senior-react-qa-engineer next to 6 agents from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
senior-react-qa-engineerJm-Paunlagui/CATHERINE	Agent	2	2d ago	Apache-2.0	A	100	Claude Code
react18-class-surgeongithub/awesome-copilot	Agent	41k	yesterday	MIT	A	81	Claude Code
genpage-edit-plannermicrosoft/power-platform-skills	Agent	1.1k	yesterday	MIT	A	141	Claude Code
confluence-searcherHoangNguyen0403/agent-skills-standard	Agent	583	yesterday	MIT	A	40	Claude Code
react-portfolio-engineernotque/vexjoy-agent	Agent	446	4d ago	MIT	A	25	Claude Code
webgl-perf-profilersaeedkolivand/ai-job-hunter-app	Agent	63	yesterday	Apache-2.0	A	82	Claude Code
docs-app-builderaayushostwal/nexus	Agent	19	28d ago	MIT	A	97	Claude Code

CATHERINE: Agent for Claude Code