Mern Design Review
Visual design review using Playwright screenshots against mern-styleguide.
Install
$ agentstack add skill-edfenton-claude-skills-mern-design-review ✓ scanned · ✓ verified, works with Claude Code, Cursor, and more.
Security review
✓ PassedNo issues found. Passed automated security review. · v0.1.0 How review works →
- ✓ Prompt-injection patterns
- ✓ Secret / credential exfiltration
- ✓ Dangerous shell & filesystem operations
- ✓ Untrusted network calls
- ✓ Known-malicious package signatures
What it can access
- ✓ Network access No
- ✓ Filesystem access No
- ✓ Shell / process execution No
- ✓ Environment & secrets No
- ✓ Dynamic code execution No
From automated source analysis of v0.1.0. “Used” means the capability is present in the source — more access means more to trust, not that it’s unsafe.
Verified badge
Passed review? Show it. Paste this badge into your README, it links to the public security report.
Links to your public security report.[](https://agentstack.voostack.com/security/report/skill-edfenton-claude-skills-mern-design-review) Reliability & compatibility
Declared compatibility
Compatibility is declared by the source manifest. End-to-end runtime verification is coming, see below.
We're building live execution health for every listing: tool-call success rate, median latency, uptime, and last-checked timestamps, measured, not self-reported. It isn't live yet, so we don't show numbers we can't stand behind.
How agent discovery & health will work →About
Purpose
Capture screenshots at multiple breakpoints and evaluate against mern-styleguide. Report issues, then (with approval) fix and run tests to confirm.
Arguments
--base-url— App URL (default: http://localhost:3000)--routes— Comma-separated routes (default: discover fromapp/**/page.tsx)--no-fix— Report only, don't offer to fix
Workflow
1. Setup
- Ensure dev server running (
pnpm dev) - Discover routes if not specified (scan for
page.tsxfiles)
2. Capture screenshots
Use Playwright to capture each route at:
- Mobile: 390×844
- Tablet: 834×1194
- Desktop: 1440×900
Save to playwright-artifacts/design-review/ (don't commit).
3. Evaluate against mern-styleguide
Review each screenshot for:
- Responsiveness — intentional adaptation, not just stacking
- Typography — no banned fonts, contributes voice
- Spacing/hierarchy — premium feel, clear visual order
- Color — uses semantic tokens, proper contrast
- Accessibility — visible focus states, adequate tap targets
- Anti-patterns — no unchanged shadcn defaults, card nesting, decorative effects
For each issue, note:
- Route and viewport
- Severity:
must-fix|should-fix|nice-to-have - What violates mern-styleguide
- Concrete fix
4. Report results
Summary of screens/viewports reviewed + findings by severity.
5–6. Approval gate, fix and confirm
See /shared-review-workflow for severity definitions, approval gate protocol, and fix constraints. After fixes, re-capture affected screenshots and run /mern-unit-test.
Reference
For Playwright setup, screenshot scripts, and evaluation checklist, see reference/mern-design-review-reference.md
Source & license
This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.
- Author: edfenton
- Source: edfenton/claude-skills
- License: MIT
Install and usage instructions live in the source repository linked above.
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Versions
- v0.1.0 Imported from the upstream source.