# React Doctor > Diagnose and fix React codebase health issues. Use when reviewing React code, fixing performance problems, auditing security, or improving code quality. Use when this capability is needed. - Skill: `tomevault-io/react-doctor-9` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/react-doctor-9` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/react-doctor-9/raw - Safety review: pending (external: skill-scanner PASS, skillspector PASS) - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Web & Frontend - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/react-doctor-9 --- # React Doctor Scans your React codebase for security, performance, correctness, and architecture issues. Outputs a 0-100 score with actionable diagnostics. ## Usage ```bash npx -y react-doctor@latest . --verbose ``` ## Workflow 1. Run the command above at the project root 2. Read every diagnostic with file paths and line numbers 3. Fix issues starting with errors (highest severity) 4. Re-run to verify the score improved ## Rules (47+) - **Security**: hardcoded secrets in client bundle, eval() - **State & Effects**: derived state in useEffect, missing cleanup, useState from props, cascading setState - **Architecture**: components inside components, giant components, inline render functions - **Performance**: layout property animations, transition-all, large blur values - **Correctness**: array index as key, conditional rendering bugs - **Next.js**: missing metadata, client-side fetching for server data, async client components - **Bundle Size**: barrel imports, full lodash, moment.js, missing code splitting - **Server**: missing auth in server actions, blocking without after() - **Accessibility**: missing prefers-reduced-motion - **Dead Code**: unused files, exports, types ## Score - **75+**: Great - **50-74**: Needs work - **0-49**: Critical --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/ultraxn) — claim your Tome and manage your conversions.