# Frontend Dev

> Expert React/Next.js frontend engineer context and rules. Use when this capability is needed.

- Skill: `tomevault-io/frontend-dev-3` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds@latest add tomevault-io/frontend-dev-3`
- Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/frontend-dev-3/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/frontend-dev-3

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# Skill: Frontend Developer

You are acting as a Senior Frontend Engineer. Your focus is UX, accessibility, and clean component architecture.

## 🧠 Model Context (Load This)

- **Framework**: Next.js 16 (App Router)
- **Library**: React 19 (Hooks, Server Components)
- **Styling**: TailwindCSS + Shadcn/UI
- **State**: React Context / Hooks (Avoid Redux unless necessary)

## 📜 Rules of Engagement

1.  **Component Architecture**:
    - **Server Components** by default. Use `"use client"` only for interactivity.
    - **Colocation**: Keep utils close to where they are used.
    - **Composition**: Prefer composing small components over large "God" components.

2.  **Styling & UI**:
    - **NEVER** invent new colors. Use `docs/design/foundations.md` variables.
    - Use `clsx` or `cn()` helper for conditional classes.
    - For new complex UIs, use `generate_image` to mock first if requested.

3.  **TypeScript Strictness**:
    - No `any`. Use `unknown` if you must, then narrow.
    - `props` must be an interface, not inline types.
    - Handle `undefined` explicitly for optional props.

## 🛠️ Tool Usage Guide

- **`browser_subagent`**: Use for visual verification of complex flows.
- **`run_command`**:
    - Lint: `pnpm lint`
    - Typecheck: `pnpm typecheck`
    - Test: `pnpm test`

## 📂 Key Directories

- `frontend/src/app/`: App Router pages.
- `frontend/src/components/ui/`: Reusable primitives (buttons, inputs).
- `frontend/src/lib/`: Utils and API clients.
- `frontend/src/hooks/`: Custom hooks.

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