# Fe Devtools

> >-

- **Type:** Skill
- **Install:** `agentstack add skill-sukirman1901-frontend-expert-fe-devtools`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [sukirman1901](https://agentstack.voostack.com/s/sukirman1901)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [sukirman1901](https://github.com/sukirman1901)
- **Source:** https://github.com/sukirman1901/frontend-expert/tree/main/skills/fe-devtools
- **Website:** https://github.com/sukirman1901/frontend-expert

## Install

```sh
agentstack add skill-sukirman1901-frontend-expert-fe-devtools
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# FE DevTools

## Overview

Use browser/tooling evidence when available — don’t invent Lighthouse scores. Pair with `web-performance`, `accessibility`, and `frontend-testing`.

## When to use

- `/test-ui` or ship checks when tooling exists in the project
- User asks for Lighthouse, axe, Network, Layout shift, Coverage
- Design/perf audit needs **measured** Performance or Accessibility scorecard rows
- Verifying no horizontal overflow / focus order with real viewport tools

## When to skip

- No runnable app / static markdown-only change
- User wants theory-only advice with no environment
- Pure token rename with no UI surface

## MUST vs optional

| Check | MUST when | Optional |
|-------|-----------|----------|
| **Responsive viewports** | Layout UI ship (320/768/1024/1440) | — |
| **Keyboard / focus** | Interactive forms, dialogs, drawers | — |
| **axe / a11y scan** | `/test-ui`, `/design` deep, or user asks | Quick source-only audit |
| **Lighthouse / CWV** | Perf ask, public landing, `/design` deep with app running | Tiny internal chrome tweak |
| **Network waterfalls** | Suspected overfetch / huge assets | Default CRUD form |
| **Layout / CLS** | Animations, fonts, images without dimensions | Static settings copy |

**Rule:** Never fabricate scores. If tools didn’t run → scorecard = `not evaluated`.

## Workflow

1. **Confirm target** — URL/route or local preview command
2. **Viewport** — resize or device mode; note Responsive Conventions
3. **A11y** — axe or equivalent; fix Critical/High (labels, contrast, names)
4. **Perf** — Lighthouse or Web Vitals extension on key route; note LCP/INP/CLS risks
5. **Network** — flag obvious huge JS/CSS/images on first load
6. **Report** — tool · metric · value · source; hand remediations to `web-performance` / `accessibility` / build skills

## Checklist

- [ ] Did not invent Lighthouse/axe numbers
- [ ] Viewport evidence for layout ships
- [ ] A11y scan when MUST (or waiver documented)
- [ ] Perf metrics only when tool ran or explicitly source-level risks
- [ ] Findings mapped to skills (not dumped as vague “optimize”)

## Depth

`references/fe-devtools.md`.  
CWV detail: `references/performance.md`.  
A11y: `references/accessibility-checklist.md`.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [sukirman1901](https://github.com/sukirman1901)
- **Source:** [sukirman1901/frontend-expert](https://github.com/sukirman1901/frontend-expert)
- **License:** MIT
- **Homepage:** https://github.com/sukirman1901/frontend-expert

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-sukirman1901-frontend-expert-fe-devtools
- Seller: https://agentstack.voostack.com/s/sukirman1901
- Browse the marketplace: https://agentstack.voostack.com/browse

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