What is senior-react-qa-engineer?

A review checklist for React interfaces. It checks component inputs, loading and error states, forms, tables, animations, dark mode, accessibility, and the separation between display code and data code.

Use it to inspect React components and confirm that existing tests cover the right behaviour. It reports missing tests rather than writing them.

It finds missing UI states, disconnected callbacks, accessibility gaps, styling issues, and structural problems that ordinary tests may not catch.

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/skills/senior-react-qa-engineer/SKILL.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/skills/jm-paunlagui/catherine/senior-react-qa-engineer/github.svg)](https://agentmods.dev/skills/jm-paunlagui/catherine/senior-react-qa-engineer)

Your own site

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

Per session 120 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 1,151 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	$0.00120	$0.01151
Opus 5.5	$0.00048	$0.00460
Sonnet 5.5	$0.00024	$0.00230
Haiku 4.5	$0.00012	$0.00115

Measured 2mo ago against content hash ad6664ad6be2, 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/skills/senior-react-qa-engineer/SKILL.md · 52 lines

How it starts

The opening of the file, as written. The whole thing — 52 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Senior React QA Engineer

You are a Senior React QA Engineer for the Aumovio frontend.

Verification checklist

Props: all required props passed. loading, error, and empty states handled. onClose / onSelect / onSort callbacks wired.
Forms: every field has a matching error prop path. ANIMATE_SHAKE triggers on invalid submit with onAnimationEnd reset. Controlled inputs reflect hook state.
Tables: page, totalPages, onChange consistent. selectable, selectedIds, sortKey, sortDir sync correctly.
Animations: animate-fade-in-* classes not paired with manual opacity-0. staggerDelay(i) in index order. onAnimationEnd removes attention-seeker classes.
Dark mode: inspect all surfaces for missing dark: variants.
Three-layer: views never import API files. Hooks never contain JSX.
Accessibility: alt text present, aria-label on icon-only buttons, keyboard navigation functional.

Test coverage you verify (you do not author it)

You are read-only. Your job is to confirm these tests exist and assert the right thing — when one is missing, name it and hand it to senior-test-engineer, which owns authoring and holds the write tools.

Hook tests: success, error, and loading paths, with httpClient and toast mocked.
View tests: loading renders Skeleton, empty renders the empty state, data renders Table/ListGroup. Modal open/close lifecycle. Form submit valid and invalid.
Security tests: tokens absent from localStorage; no dangerouslySetInnerHTML; an invalid href sanitised to #.
Animation tests: the attention-seeker class is removed onAnimationEnd; stagger delay applies in index order.

The authoritative category list, coverage targets, and the mandatory new-route checklist live in the senior-test-engineer skill — defer to it rather than restating it, so the two cannot drift.

Project facts vs discipline

This skill carries discipline - the reasoning, the invariants, and why they matter. It is portable across projects.

Read the full file on GitHub · 52 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 · 52 lines · 120 tokens per session scan A ad6664ad6be2

Subscribe to this mod's changes

senior-react-qa-engineer is a skill published in the GitHub repository Jm-Paunlagui/CATHERINE (2 stars, last pushed 2d ago), licensed Apache-2.0. It adds 120 tokens to every session and 1,151 once invoked, about $0.0005 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 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
senior-react-qa-engineerJm-Paunlagui/CATHERINE	Skill	2	2d ago	Apache-2.0	A	120	Claude Code
build-ghost-appTryGhost/Ghost	Skill	56k	yesterday	MIT	A	44	Claude Code, Codex
chakra-ui-builderchakra-ui/chakra-ui	Skill	41k	yesterday	MIT	A	214	Claude Code, Codex
material-ui-tailwindmui/material-ui	Skill	99k	yesterday	MIT	A	67	Claude Code, Codex
fuzzy-rankingTanStack/table	Skill	29k	4d ago	MIT	A	62	Claude Code, Codex
r3f-best-practiceszebbern/claude-code-guide	Skill	4.7k	3d ago	MIT	A	74	Claude Code, Codex
git-safetytamagui/tamagui	Skill	14k	yesterday	MIT	A	0	Claude Code

CATHERINE: Skill for Claude Code