Individual skill

responsiveness-check

Test website responsiveness across viewport widths using browser automation. Resizes a single session through breakpoints, screenshots each width, and detects layout transitions (column changes, nav switches, overflow). Produces comparison reports showing exactly where layouts break. Trigger with 'responsiveness check', 'check responsive', 'breakpoint test', 'viewport test', 'responsive sweep', 'check breakpoints', or 'test at mobile'.

plugins/dev-tools/skills/responsiveness-check/SKILL.md

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Last checked: Nov 10, 2026

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Repository stars (not skill ratings): 1,107
Repository last updated: Oct 9, 2026
License: MIT

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SKILL.mdcore · 7,017 bytes
references/breakpoints.mddoc · 2,836 bytes
references/report-template.mddoc · 3,025 bytes

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# Responsiveness Check

Test how a website's layout responds to viewport width changes. Resizes through breakpoints in a single browser session, screenshots each width, compares adjacent sizes, and reports where layouts break.

**What this tests**: Layout responsiveness — overflow, stacking, navigation transitions, content reflow.

**What this does NOT test**: General accessibility (ARIA, semantic HTML, heading hierarchy, colour contrast). Those don't vary by viewport width — use the ux-audit skill instead.

## Browser Tool Priority

Before starting, detect available browser tools:

1. **playwright-cli** (preferred) — supports resize, named sessions, and sub-agent parallelism. If installed, run `/playwright-cli` first to load the full command reference.
2. **Playwright MCP** (`mcp__plugin_playwright_playwright__*`) — `browser_resize` for viewport changes.