Measure, diagnose, and optimize Core Web Vitals (LCP, INP, CLS), render-blocking resources, and Lighthouse scores.
Andromity loads skills from folders you trust. Install with andromity skill install web-performance-auditor — autonomy and approval limits stay configurable per session.
# Install the "Web Performance & Core Web Vitals" skill You are installing an AgenticMarket skill into this workspace. Follow these steps exactly. ## 1. Detect your environment and choose the destination file - Andromity: `.andromity/skills/web-performance-auditor/SKILL.md` (or user scope `~/.andromity/skills/web-performance-auditor/SKILL.md`) - Antigravity / Gemini CLI: `.agent/skills/web-performance-auditor/SKILL.md` - Cursor: `.cursor/rules/web-performance-auditor.mdc` - Claude Code: append to `CLAUDE.md` (or `.claude/skills/web-performance-auditor.md`) - Windsurf: append to `.windsurfrules` - Cline / Roo Code: `.clinerules/web-performance-auditor.md` - GitHub Copilot: append to `.github/copilot-instructions.md` - ChatGPT / web only: paste the content into Custom Instructions - Any other agent: save to `.agent/skills/web-performance-auditor/SKILL.md` ## 2. Create the destination file - Preserve every existing file and configuration entry. - Create parent folders as needed. - Never overwrite unrelated content. ## 3. Write exactly this content ```markdown --- name: web-performance-auditor description: "Measure, diagnose, and optimize Core Web Vitals (LCP, INP, CLS), render-blocking resources, and Lighthouse scores." author: google license: mit version: 1.0.0 --- # Web Performance & Core Web Vitals Auditor Analyze web page loading, interactivity, and visual stability according to 2026 Core Web Vitals metrics. ## Metrics - **Largest Contentful Paint (LCP)**: Target < 2.5s. Optimize hero images, preload critical fonts. - **Interaction to Next Paint (INP)**: Target < 200ms. Break up long tasks, yield to main thread. - **Cumulative Layout Shift (CLS)**: Target < 0.1. Set explicit aspect ratios on images and embeds. ``` ## 4. Verify - Confirm the file exists and is readable. - Report the destination path and confirm the "Web Performance & Core Web Vitals" skill is installed and active. Skill metadata: - Slug: web-performance-auditor - Category: testing - License: mit - Source: AgenticMarket
Analyze web page loading, interactivity, and visual stability according to 2026 Core Web Vitals metrics.
Measure, diagnose, and optimize Core Web Vitals (LCP, INP, CLS), render-blocking resources, and Lighthouse scores.
Web Performance & Core Web Vitals works seamlessly with Cursor (.cursor/rules), Claude Code (CLAUDE.md & .claude/skills), Windsurf (.windsurfrules), Google Antigravity (.agent/skills), Andromity (.andromity/skills), and Cline.
Click '1-Click Prompt Install' in the right sidebar or copy the prompt into your agent chat (Cursor Composer, Claude Code, or Andromity). The agent automatically configures the skill instruction file into your workspace.
Yes, Web Performance & Core Web Vitals is 100% free and open-source under the mit license on AgenticMarket with no per-call fees or paywalls.
Create new skills, modify and improve existing skills, and measure skill performance. Use when users want to create a skill from scratch, edit, or optimize an existing skill, run evals to test a skill, benchmark skill performance with variance analysis, or optimize a skill's description for better triggering accuracy.
End-to-end browser automation, Page Object Model (POM), trace recording, and cross-browser visual regression testing.
/em:stress-test — Business assumption stress testing. Use before betting on a plan whose core assumptions are unvalidated — e.g. stress-testing 'enterprise buyers will tolerate a 6-month pilot' or a hockey-stick revenue model.
AgenticMarket
